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DESCRIPTION JP2001232294

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DESCRIPTION JP2001232294
[0001]
The present invention relates to an ultrasonic vibration applicable to an ultrasonic sensor used as
an on-vehicle or the like, which emits ultrasonic waves and receives a reflected wave from an
obstacle to detect the presence of the obstacle. It is about the child.
[0002]
2. Description of the Related Art As an ultrasonic sensor used for conventional detection of
obstacles and the like, which is used in vehicles, etc., an ultrasonic pulse is oscillated in the air
from an ultrasonic transducer and reflected on an obstacle such as an object to be detected.
There is a configuration in which the reflected wave is received by the ultrasonic transducer, the
received signal is processed, and an alarm or the like is emitted.
[0003]
The ultrasonic transducer A 'of the ultrasonic sensor shown in FIG. 25 has a metal case body 1'
formed of a disk-shaped diaphragm 4 'and a cylindrical side plate 5'.
Inside the case body 1 ′, the piezoelectric element 8 is disposed on the inner surface of the
diaphragm 4 ′ in a state of being electrically connected to the diaphragm 4 ′. Further, a pair of
lead wires 7 are led out to the inside of the case body 1 ', and this lead wire 7 is temporarily
connected to the substrate 60 disposed inside the case body 1', and then one of the lead wires 7
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1
is electrically connected directly to the surface of the piezoelectric element 8, and the other lead
wire 7 is connected to the inner surface of the side plate 5 'and electrically connected to the back
surface of the piezoelectric element 8 through the side plate 5' and the diaphragm 4 '. It is
connected. Further, inside the case body 1 ′, a sound absorbing material 29 is disposed so as to
cover the surface of the piezoelectric element 8. Furthermore, a filler 30 is filled inside the case
body 1 '.
[0004]
Further, in the example shown in FIG. 26, the case body 1 'is composed of a metal diaphragm 4'
and a resin side plate 5 '. Here, the side plate 5 'is internally provided with a wire 61 electrically
connected to the diaphragm 4', and the lead wire 7 connected to the side plate 5 'is vibrated by
being connected to the wire 61. It is electrically connected to the back surface of the
piezoelectric element 8 through the plate 4 '.
[0005]
In the example shown in FIG. 26, compared with the example shown in FIG. 25, the vibration of
the side plate 5 'due to the transmission and reception of the ultrasonic wave in the diaphragm 4'
can be attenuated and suppressed. The vibration of 4 'can be attenuated in a short time to
shorten the interval in which the ultrasonic wave can be transmitted and received in the
diaphragm 4', and a reduction in manufacturing cost can also be expected.
[0006]
However, as shown in FIG. 26, when the side portion of the case body 1 'is constituted only by
the side plate 5' made of resin, the rigidity of the portion supporting the diaphragm 4 'is
insufficient. As a result, the performance such as transmission output (amplitude) from the
diaphragm 4 'is insufficient.
[0007]
That is, the peripheral portion of the diaphragm 4 'is supported by the side plate 5' made of
resin, but if the rigidity of the side plate 5 'supporting the diaphragm 4' is low, the vibration of
the diaphragm 4 ' It will be easily transmitted to the side plate 5 ', and the amplitude of the
vibration of the side plate 5' itself will be reduced and the transmission output will be reduced.
[0008]
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2
Therefore, a metal plate is bent or drawn to form a metal case integrally formed with the
diaphragm and the side plate, and the resin case is insert-molded together with the metal case to
make the side plate of the metal case resin. A method has been proposed for producing a case
body by holding it in a plastic resin case.
[0009]
However, in this method, by holding the side plate of the metal case by the resin case, the rigidity
of the diaphragm can be enhanced and the transmission output can be improved, but with the
improvement of the transmission output further There is a need for improved vibration damping
capabilities.
[0010]
The present invention has been made in view of the above-described points, and an object of the
present invention is to provide an ultrasonic transducer in which the transmission output is
improved and the vibration damping capability is improved.
[0011]
The ultrasonic oscillator according to claim 1 of the present invention has a piezoelectric element
8 disposed on the inner surface side of the closed surface of the case body 1 which is open at one
end and closed at the other end. In the ultrasonic transducer A in which the closed surface is
formed as the vibrating surface 4c, the case body 1 is constituted by a resin case 3 made of a
synthetic resin material and a metal case 2 made of a metal plate material, The metal case 2 is
composed of the diaphragm 4 constituting the vibration surface 4 c and the side plate 5
embedded or held in close contact with the resin case 3, and the portion of the side plate 5
embedded or closely attached to the resin case 3 A through hole 27 is provided.
[0012]
Further, in the invention according to claim 2, in addition to the configuration according to claim
1, a tapered surface in which the size of the sectional shape orthogonal to the penetrating
direction of through hole 27 changes on the inner peripheral surface of through hole 27 of side
plate 5. It is characterized by forming 35.
[0013]
The invention according to claim 3 is characterized in that in addition to the configuration
according to claim 1 or 2, a projection 37 is formed on the opening periphery of the through
hole 27 of the side plate 5.
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[0014]
The invention according to claim 4 is characterized in that, in addition to the configuration
according to any one of claims 1 to 3, the through hole 27 is formed by cutting and raising the
surface of the side plate 5.
[0015]
In the ultrasonic oscillator according to claim 5 of the present invention, the piezoelectric
element 8 is disposed on the inner surface side of the closed surface of the case body 1 which is
open at one end and the other end is a closed surface. In the ultrasonic transducer A formed as
4c, the case body 1 is composed of a resin case 3 made of a synthetic resin and a metal case 2
made of a plate material made of metal, and the metal case 2 is made of a vibrating surface 4c.
And the side plate 5 which is embedded or held in close contact with the resin case 3 and the
step portion 33 is formed in a portion of the side plate 5 which is embedded or in close contact
with the resin case 3. It is characterized by
[0016]
According to the sixth aspect of the present invention, in addition to the configuration of the fifth
aspect, the step portion 33 of the side plate 5 is formed with unevenness.
[0017]
According to the seventh aspect of the present invention, in addition to the configuration of the
sixth aspect, the unevenness of the step portion 33 of the side plate 5 is formed by cutting and
raising.
[0018]
In the ultrasonic transducer according to claim 8 of the present invention, the piezoelectric
element 8 is disposed on the inner surface side of the closed surface of the case body 1 which is
open at one end and the other end is a closed surface. In the ultrasonic transducer A formed as
4c, the case body 1 is composed of a resin case 3 made of a synthetic resin and a metal case 2
made of a plate material made of metal, and the metal case 2 is made of a vibrating surface 4c.
And the side plate 5 which is embedded in or closely held by the resin case 3 so as to form a
concavo-convex portion in a portion of the side plate 5 which is embedded in or close to the resin
case 3. It is a feature.
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[0019]
The invention according to claim 9 is characterized in that, in addition to the configuration
according to claim 8, the unevenness of the side plate 5 is formed by shearing the side plate 5.
[0020]
According to the tenth aspect of the present invention, in addition to the configuration of the
eighth aspect, as the side surface 53 of the convex portion 50 protruding from the side plate 5
moves toward the tip end side of the convex portion 50 Are formed to be inclined so as to
protrude outward.
[0021]
According to the eleventh aspect of the present invention, in addition to the configuration of any
of the first to tenth aspects, the rib 10 is formed on the end of the side plate 5 of the metal case 1
opposite to the diaphragm 4. It is characterized by
[0022]
According to the twelfth aspect of the present invention, in addition to the configuration of any of
the first to eleventh aspects, a cap body 41 is provided at an end of the side plate 5 of the metal
case 2 opposite to the diaphragm 4. It is characterized by
[0023]
In addition to the configuration of claim 12, the invention according to claim 13 is characterized
in that the cap body 41 is formed of a material softer than the resin case 3.
[0024]
In addition to the structure of claim 12, the invention according to claim 14 is characterized in
that the cap body 41 is formed of a material harder than the resin case 3.
[0025]
In the invention according to claim 15, in addition to the configuration according to any one of
claims 1 to 14, the end of the side plate 5 of the metal case 2 on the opposite side to the
diaphragm 4 is formed by bending back. It is a feature.
[0026]
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According to the sixteenth aspect of the invention, in addition to the configuration of any one of
the first to fifteenth aspects, the reinforcing member 45 formed of a rigid material is arranged to
abut on the surface of the side plate 5 of the metal case 2. It is characterized by being set up.
[0027]
The invention according to claim 17 is characterized in that, in addition to the configuration
according to any one of claims 1 to 16, the side plate 5 of the metal case 2 is formed in a
cylindrical shape.
[0028]
According to the eighteenth aspect of the present invention, in addition to the configuration of
any one of the first to seventeenth aspects, the side plate 5 constituting the metal case 2 and the
diaphragm 4 are integrally formed. It is.
[0029]
According to the nineteenth aspect of the present invention, in addition to the configuration of
any one of the first to seventeenth aspects, the side plate 5 constituting the metal case 2 and the
diaphragm 4 are separately formed, and the side plate 5 and the diaphragm The side plate 5 and
the diaphragm 4 are connected by integrally molding the resin case 4 with the resin case 3.
[0030]
According to the invention of claim 20, the side plate 5 and the diaphragm 4 constituting the
metal case 2 are separately formed, and the side plate 5 and the diaphragm 4 are connected by
adhesion, welding or brazing. It is a feature.
[0031]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below.
[0032]
First, the ultrasonic transducer A shown in FIG. 1 will be described.
[0033]
The case body 1 is composed of a metal case 2 and a resin case 3.
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[0034]
The metal case 2 is composed of a diaphragm 4 and a side plate 5.
The vibrating plate 4 is formed in a flat plate shape having a substantially uniform thickness, one
surface thereof is formed as a vibrating surface 4c, and the other surface is formed as a
disposition surface 4d on which the piezoelectric element 8 is disposed.
The outer peripheral edge of the diaphragm 4 is constituted by a pair of opposing nonconnecting portions 4b and a pair of opposing connecting portions 4a, and the non-connecting
portions 4b are curved in such a manner as to project outward. The connection portions 4a are
formed in a straight line substantially parallel and parallel to each other.
[0035]
The side plate 5 is formed in a cylindrical shape, and the outer peripheral surface thereof is
disposed to face, and disposed to face a pair of curved surface portions 26 having a shape along
the non-connecting portion 4 b of the diaphragm 4. It is comprised from a pair of plane part 25
which has a shape along connection part 4a of board 4. FIG.
Here, each one end of the pair of flat portions 25 is directly connected to the connecting portion
4 a of the diaphragm 4, while each one end of the pair of curved surface portions 26 and the
non-connecting portion 4 b of the diaphragm 4 are directly connected A slit-like opening 9 is
formed between the end of the curved surface portion 26 and the non-connecting portion 4 b
without being connected.
[0036]
A plurality of through holes 27 are formed in the side plate 5.
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In the illustrated example, two through holes 27 are formed in each of the pair of curved surface
portions 26 and the flat surface portion 25.
Further, the opening shape of the through hole 27 is not limited to the circular shape as
illustrated, but can be formed into an appropriate shape such as an elliptical shape or a
polygonal shape.
Further, the bore diameter of the through hole 27 is such a size that a sufficient amount of resin
flows into and is filled when the resin case 3 is integrally molded as described later, for example,
the metal case 2 is configured If the thickness of the metal plate to be formed is 0.5 mm, it is
preferable to set it to about 0.3 to 1.0 mm.
[0037]
The metal case 2 does not have to be designed to have a thickness designed to form a thin
portion or a thick portion, and its shape is simple, so a single piece of metal is not required to be
subjected to a complicated forging step or cutting step. The plate can be produced inexpensively
and easily by subjecting the plate to a simple bending process or drawing process.
For example, first, a metal plate such as an aluminum plate or the like is drawn and shaped into a
bottomed cylindrical shape.
This drawing processing can be performed through three steps of drawing processing of shallow
drawing, middle drawing and deep drawing.
Then, the connecting portion between the bottom portion and the peripheral surface portion is
drilled at two places using a punch or the like to form a pair of openings 9, and further through
holes 27 are formed in the side plate 5 using a punch or the like. The metal case 2 is formed by
setting.
[0038]
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The resin case 3 is formed of a synthetic resin material having high rigidity and excellent
damping performance.
The resin case 3 has a circular front surface and a circular rear surface with a larger rear surface
than the front surface, and the outer peripheral surface connecting the front and the rear surface
has a larger diameter on the rear surface side than on the front surface side. A step 5a is formed
to be as follows.
The resin case 3 is formed with a through-hole in the front-rear direction opening in the front
and back, and the inside of the through-hole is configured as an arrangement portion 6 in which
the metal case 2 is arranged.
The inner surface shape of the placement portion 6 is formed to have substantially the same size
and shape as the outer surface shape of the side plate 5 of the metal case 2.
[0039]
The metal case 2 is held in the placement portion 6 of the resin case 3, and at this time, the
diaphragm 4 of the metal case 2 closes the opening on the front side of the placement portion 6
of the resin case 3 and the diaphragm The vibration surface 4 c of 4 is disposed so as to be
substantially flush with the front surface of the resin case 3.
[0040]
Further, the pair of side plates 5 is disposed in close contact with the inner surface of the
placement portion 6 and is fixed to the resin case 3 at the inner surface of the placement portion
6.
Here, in the through hole 27 of the side plate 5, the projection 28 projecting inward from the
inner surface of the arrangement portion 6 of the resin case 3 is fitted, whereby the side plate 5
is firmly fixed to the inner surface of the arrangement portion 6. ing.
[0041]
At this time, among the pair of connecting portions 4 a and non-connecting portions 4 b
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9
constituting the outer peripheral edge of the diaphragm 4, the connecting portion 4 a directly
connected to the side plate 5 is fixed to the resin case 3. The non-connection portion 4b not
directly connected is not fixed to the resin case 3 and is easily bent.
[0042]
The case body 1 configured as described above forms the resin case 3 integrally with the metal
case 2 by arranging the metal case 2 in the cavity in the molding die and filling and curing the
resin in the cavity. It can be molded by insert molding.
In this molding process, the resin flows into the through hole 27 of the side plate 5 of the metal
case 2 and is filled to form the projection 28, and the side plate 5 of the metal case 2 is firmly
fixed to the placement portion 6.
[0043]
The back surface of the piezoelectric element 8 is electrically connected to the disposition
surface 4 d of the diaphragm 4.
Further, lead wires 7 are connected to the side plate 5 of the metal case 2 and the surface of the
piezoelectric element 8 which is not connected to the disposition surface 4 d.
[0044]
Further, a sound absorbing material 29 formed of felt or the like is disposed inside the metal case
2, and the sound absorbing material 29 is slightly separated from the piezoelectric element 8 on
the side opposite to the diaphragm 4. It is arranged in the state where it was made.
[0045]
A filler 30 is filled in the metal case 2 from the sound absorbing material 29 to the opening on
the opposite side to the diaphragm 4 in close contact with the side plate 5.
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As a material of the filler 30, a material such as silicon resin having good adhesion to the metal
case 2 or good adhesion to the metal case 2, low rigidity and having vibration damping capability
It is selected.
The inside of the metal case 2 is sealed with the filler 30 to improve the waterproofness of the
ultrasonic transducer A, and an ultrasonic sensor of drip-proof specification can be obtained.
Further, the vibration transmitted from the diaphragm 4 to the side plate 5 is alleviated by the
filler 30, so that the generation of the resonance of the vibration is prevented, and the vibration
damping capability of the diaphragm 4 is improved.
[0046]
The ultrasonic transducer A configured as described above applies the pulse voltage between the
lead wires 7 and connects the control circuit for measuring the voltage generated between the
lead wires 7 to obtain an ultrasonic sensor Can be configured as
When a pulse voltage is applied between the lead wires 7, the piezoelectric element 8 vibrates,
and the diaphragm 4 vibrates accordingly to oscillate an ultrasonic wave.
Further, the ultrasonic wave oscillated from the diaphragm 4 strikes an obstacle or the like and is
reflected, and when the reflected wave hits the vibration surface 4c of the diaphragm 4, the
diaphragm 4 vibrates and the piezoelectric element 8 vibrates accordingly.
At this time, an electromotive force is generated in the piezoelectric element 8. By detecting the
electromotive force between the lead wires 7, the presence or absence of an obstacle can be
detected.
[0047]
When attaching such an ultrasonic transducer A to a mounting object such as a bumper of a car,
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the ultrasonic transducer A is formed in the opening formed in the mounting object, and the
closed surface 1a of the case 1 at the opening 9 Arrange so as to be exposed to the outside.
At this time, particularly when the ultrasonic transducer A is disposed on a bumper of a car or
the like for mounting on a vehicle, the closed surface 1a of the case body 1 is disposed
substantially perpendicular to the horizontal plane, and 4a is disposed along the vertical
direction, and a pair of non-connecting portions 4b are disposed along the horizontal direction.
[0048]
When oscillating an ultrasonic wave from the ultrasonic transducer A, the vibration mode in the
horizontal direction (direction from one connecting portion 4a to the other connecting portion
4a) in the diaphragm 4 is a simple bending vibration, but the vertical direction The vibration
mode (in the direction from one non-connecting portion 4b to the other non-connecting portion
4b) is easily bent because the non-connecting portion 4b is not fixed to the resin case 3, so
horizontal vibration is generated. The plane vibration is greater than that in the mode, and even if
the diaphragm 4 is formed into a flat plate having a substantially uniform thickness, a plurality of
types of vibration modes can be generated in the diaphragm 4.
As a result, the oscillation direction of the ultrasonic wave generated by the vibration of the
diaphragm 4 becomes sharper than the horizontal direction without spreading in the vertical
direction, and the ultrasonic wave oscillated from the diaphragm 4 as a whole in the horizontal
direction Directivity is provided with anomalous directivity in which the spread is narrowed but
the spread in the vertical direction is narrowed.
Accordingly, the detection area of the ultrasonic transducer A is wide in the horizontal direction
and narrow in the vertical direction, and the transmission output of ultrasonic waves is improved.
Therefore, when such an ultrasonic transducer A is used particularly for on-vehicle use, it is
possible to prevent detection of a road surface or the like which does not hinder the movement
of the vehicle.
[0049]
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Further, since the side plate 5 is firmly held and fixed to the resin case 3 as described above
when transmitting and receiving ultrasonic waves in this manner, vibration of the side plate 5 is
suppressed and the diaphragm 4 is connected. The portion 4a is firmly fixed to the resin case 3,
and the directivity of the oscillated ultrasonic wave is further improved.
[0050]
Moreover, when the diaphragm 4 is firmly fixed to the resin case 3 as described above,
transmission of vibration from the diaphragm 4 to the side plate 5 is suppressed, and the
amplitude of the diaphragm 4 can be increased. The transmission output of the ultrasonic wave
from the diaphragm 4 can be improved.
[0051]
Furthermore, even if the vibration is transmitted to the side plate 5, the vibration of the side plate
5 is suppressed by holding and fixing the side plate 5 firmly to the resin case, and as a result, the
vibration is transmitted to the resin case 3 etc. Being prevented.
Thus, by suppressing the transmission of the vibration, the occurrence of resonance can be
suppressed, the diaphragm 4 can be prevented from vibrating for a long time by resonance, and
the vibration damping capability of the diaphragm 4 can be improved. It is a thing.
When the ultrasonic transducer A is configured as an ultrasonic sensor, a measurement error
may occur if the vibration at the time of oscillation of the ultrasonic wave is not attenuated when
the reflected wave is received by the diaphragm 4. As described above, when the vibration
damping capability is improved, the vibration of the diaphragm 4 can be quickly damped after
the oscillation of the ultrasonic wave, and the reception sensitivity of the reflected wave is
improved.
[0052]
Further, in the ultrasonic transducer A configured as described above, since the oscillated
ultrasonic waves themselves have directivity with anomalous directivity, in the forward direction
that is the oscillation direction of the ultrasonic waves from the ultrasonic oscillator A There is no
need to provide a horn or the like for imparting directivity to ultrasonic waves, and ultrasonic
vibrator A can be exposed directly to the outside without forming a depression or the like in front
of ultrasonic vibrator A. And prevent foreign matter such as rain water, snow, dust, etc. from
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accumulating in front of the ultrasonic transducer A, and change or erroneous directionality of
the directivity of ultrasonic waves emitted from the ultrasonic transducer A by such foreign
matter. Operation can be prevented, and the detection area where an obstacle can be detected
changes, or even if there is no obstacle, it is reported as if there is an obstacle. It can be
prevented.
[0053]
Further, in the state where the ultrasonic transducer A is attached to the attachment object, the
closed surface 1a of the case body 1 can be disposed flush with the surface of the attachment
object, and the horn etc. is attached object It is possible to improve the appearance in the
mounted state without projecting from the surface of the case or exposing the opening to the
outside.
[0054]
In the ultrasonic transducer A as shown in FIG. 1, when the resin case 3 is integrally formed on
the metal case 2 by insert molding as described above to produce the case body 1, the resin case
3 is simultaneously formed. The case body 1 can be manufactured, and the manufacturing
process of the ultrasonic transducer A can be reduced, and the adhesion between the side plate 5
of the metal case 2 and the inner surface of the arrangement portion 6 of the resin case 3 can be
further improved. As a result, the connection portion 4a of the diaphragm 4 of the metal case 2
can be stably fixed to the resin case 3, and the operation stability of the ultrasonic transducer A
can be improved.
[0055]
In the example shown in FIG. 2, in the configuration of FIG. 1, the shape of the diaphragm 4 of
the metal case 2 is such that the pair of connecting portions 4a are formed in a straight line and
arranged in parallel and in parallel 4b is also formed in a substantially square shape which is
linearly formed and arranged in parallel and parallel.
The side plate 5 of the metal case 2 is composed of a pair of curved surface portions 26 and a
flat surface portion 25 having the same shape as in FIG.
Further, the shape of the placement portion 6 of the resin case 3 is formed in a substantially
square shape in cross section along the shape of the diaphragm 4 over the entire region, and the
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pair of flat portions 25 of the side plate 5 is along the inner surface of the placement portion 6
While being disposed, the pair of curved surface portions 26 of the side plate 5 is disposed in a
state of being embedded in the resin case 3, and the side plate 5 is more firmly held and fixed.
At this time, the resin is filled in the through holes 27 of the curved surface portion 26, whereby
the attachment strength of the curved surface portion 26 is further improved, whereby the
transmission of the vibration from the diaphragm 4 to the side plate 5 is suppressed to vibrate.
The vibration efficiency of the plate 4 is further improved, and the transmission output of the
ultrasonic wave by the vibration of the diaphragm 4 is further improved.
On the other hand, the flat portion 25 of the side plate 5 is disposed along the inner surface of
the placement portion 6 in the state where the projection 28 is fitted in the through hole 27 as in
the case shown in FIG.
[0056]
The illustrated metal case 2 is one that is inexpensively and easily manufactured by bending a
single metal plate.
That is, as the metal plate, a total of four sub-plates 13b are formed extending from both end
portions in the longitudinal direction of the rectangular main plate 13a in the longitudinal
direction.
The main plate 13a is bent in a U-shape, and the bent portions of both ends are formed as the
side plate 5, and the portion sandwiched by the side plate 5 is formed as the diaphragm 4.
This bending process is performed inside the part in which the sub board 13b is formed.
At this time, the two pairs of sub-plates 13b are arranged to face each other.
Further, the sub-plate 13b is bent toward the opposing sub-plates 13b and curved so as to
project the sub-plates 13b outward, and the tips of the opposing sub-plates 13b are butted.
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At this time, in the outer edge of the diaphragm 4, the fold portion of the main plate 13a is
formed as the connection portion 4a, and the other portion is formed as the non-connection
portion 4b. Further, an opening 9 communicating the inside and the outside of the metal case 2
is formed in a portion surrounded by the non-connecting portion 4 b and the outer edge of the
portion formed from the sub plate 13 b of the side plate 5.
[0057]
Here, in the metal case 2 shown in FIG. 2B, the end portions of the sub plate 13b are formed in a
straight line, and the side plates 5 are formed by abutting the end portions of the sub plate 13b
so as to abut each other. It is. On the other hand, in the metal case 2 shown in FIG. 2A, the fitting
concave portion 32a and the fitting convex portion 32b are formed in the end portion of the sub
plate 13b such that the portions abutted against each other fit with each other. The side plates 5
are formed by butting end portions of the plate 13b so that the fitting concave portion 32a and
the fitting convex portion 32b fit together, and the metal case 2 is formed more firmly. There is.
[0058]
Further, in the example shown in FIG. 2, instead of providing the filler 30 in the placement
portion 6, a rigid filling part 31 made of resin or metal having a cross-sectional shape
substantially the same as the placement portion 6 is attached. Provided. By providing this filling
part 31, the flat part 25 of the side plate 5 is pressed against the inner surface of the placement
part 6 by the filling part 31, and the adhesion on the inner face of the placement part 6 is
improved. It is held and fixed at Therefore, the diaphragm 4 is further firmly held and fixed to the
resin case 3, and the transmission power is improved, and the generation of the vibration in the
side plate 5 is suppressed, and the side plate from the diaphragm 4 is The transmission of
vibration to 5 is further suppressed, and the occurrence of vibration resonance is suppressed to
improve the vibration damping capability. In this case, in order to prevent an adverse effect such
as generation of resonance of vibration due to transmission of vibration of piezoelectric element
8 from lead 7 directly connected to piezoelectric element 8, a portion where this lead is arranged
in arrangement portion 6 Preferably, the same filler 30 as in FIG. 1 is filled.
[0059]
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In the example shown in FIG. 3, the step 33 is formed on the side plate 525 of the metal case 2 in
the configuration shown in FIG. 1, and the connecting portion 4a of the diaphragm 4 and the flat
portion 25 of the side plate 5 It is formed so as to be connected via a step portion 33 projecting
toward the side. The stepped portion 33 has an upper piece 33a extending substantially at right
angles to the flat portion 25 from the edge of the flat portion 25 inward, and the flat portion 25
downward from the tip of the upper piece 33a. The lower piece 33 b extends substantially in
parallel, and the tip of the lower piece 33 a is connected to the connecting portion 4 a of the
diaphragm 4. Further, the non-connecting portion 4 b of the diaphragm 4 is disposed inward of
the curved surface portion 26 of the side plate 5. Therefore, the outer peripheral shape of the
diaphragm 4 is smaller than the cross-sectional shape of the inner surface of the side plate 5, and
the entire region of the diaphragm 4 is disposed inside the side plate 5. The illustrated metal case
2 is formed by drawing of a metal plate.
[0060]
When the step portion 33 is provided on the side plate 5 as described above, the rigidity of the
side plate 5 is improved, the transmission of the vibration from the diaphragm 4 to the side plate
5 is further suppressed, and the transmission power is further improved.
[0061]
Further, the shape of the placement portion 6 of the resin case 3 is formed in a substantially
square shape in cross section along the shape of the diaphragm 4 over the entire region, and the
side plate 5 has both the flat portion 25 and the curved portion 26 The side plate 5 is more
firmly held and fixed in a state of being buried in the resin case 3.
At this time, the resin is filled in both the curved surface portion 26 and the through holes 27 of
the flat surface portion 25 so that the mounting strength is further improved in the entire side
plate 5. As a result, the diaphragm 4 is further firmly held and fixed to the resin case 3 and the
transmission power is further improved, and the vibration of the side plate 5 is further
suppressed and the occurrence of resonance is further suppressed. The vibration damping ability
is further improved.
[0062]
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In the example shown in FIG. 4, in the example shown in FIG. 3, the side plate 5 of the metal case
2 is not provided with the through holes 27, and the side plate 5 is formed with unevenness. In
forming the unevenness, the side plate 5 is provided with a plurality of bent projections 34. The
bent projecting portion 34 is formed to project outward from the surface of the side plate 5. The
metal case 2 is formed by bending a metal plate. For example, when pressing the metal plate
which is the material of the metal case 2 as described above, the bent protrusion 34 is formed by
doweling by pressing a jig or the like to a portion formed as the side plate 5 to deform it. Be
done. Here, in the illustrated example, the metal case 2 is formed by bending a single metal plate
consisting of the main plate 13a and the sub plate 13b as in the case shown in FIG. 2A, The side
plates 5 are formed by butting end portions of the sub plate 13b so that the fitting concave
portion 32a and the fitting convex portion 32b fit together.
[0063]
In the example shown in FIG. 4, the side plate 5 is formed with irregularities to improve the
rigidity, to further improve the vibration efficiency of the diaphragm, and to further improve the
transmission power of ultrasonic waves due to the vibration of the diaphragm. It can be done.
Further, the side plate 5 embedded in the resin case 3 is engaged with the resin inside the resin
case 3 at the bent projecting portion 34 to be firmly held and fixed, and the attachment strength
of the side plate 5 to the resin case 3 is Furthermore, the transmission of the vibration from the
diaphragm to the side plate 5 is suppressed, the vibration efficiency of the diaphragm is further
improved, and the transmission output of the ultrasonic wave by the vibration of the diaphragm
is further improved. .
[0064]
In the example shown in FIG. 5, in the configuration shown in FIG. 1, the diaphragm 4 of the
metal case 2 is formed in a substantially circular shape, and the side plate 5 is formed in a
substantially cylindrical shape. It is formed in the bottomed cylindrical shape connected to the
periphery of. That is, the entire circumference of the diaphragm 4 is formed as the connection
portion 4 a directly connected to the side plate 5. The illustrated metal case 2 is formed by
drawing of a metal plate. A plurality of through holes 27 are bored in the side plate 5.
[0065]
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18
Further, the shape of the placement portion 6 of the resin case 3 is formed in a substantially
circular cross-sectional shape smaller than the shape of the diaphragm 4 over the entire area,
and all the side plates 5 of the metal case 2 are in the resin case 3. It embeds and is formed and
the side plate 5 is hold | maintained and fixed more firmly. At this time, the resin is filled in the
through hole 27 of the side plate 5 to further improve the attachment strength of the side plate
5, thereby suppressing the transmission of the vibration from the diaphragm 4 to the side plate
5. The vibration efficiency is further improved, and the transmission power of ultrasonic waves
due to the vibration of the diaphragm 4 is further improved.
[0066]
The example shown in FIG. 5 is formed so that the ultrasonic wave oscillated by the vibration
does not have directivity, and the ultrasonic wave is oscillated so as to be evenly diffused to the
surroundings.
[0067]
FIG. 6 shows another example of the through hole 27 formed in the side plate 5.
A tapered surface 35 inclined from the direction orthogonal to the side plate 5 is formed on the
inner surface of the through hole 27, and the cross sectional shape orthogonal to the penetrating
direction in the portion where the tapered surface 35 is formed is the side plate 5. It is formed to
become larger as it goes to the inner side of the.
[0068]
Here, in the example shown in FIG. 6A, the entire inner surface of the through hole 27 is formed
as the tapered surface 35, and the through direction from the opening at one end of the through
hole 27 to the opening from the other end is It is formed so that the size of the cross-sectional
shape orthogonal to may be changed continuously.
[0069]
On the other hand, in the example shown in FIG. 6B, a region from the opening at one end side of
the through hole 27 on one surface side (inner surface side) of the side plate 5 to the middle of
the inner surface of the through hole 27 is formed as a tapered surface 35 In the region where
13-04-2019
19
the tapered surface 35 is formed, the size of the cross-sectional shape orthogonal to the
penetration direction is formed so as to be continuously smaller from the one end side to the
other end side of the through hole 27 .
Further, a region on the other end side of through hole 27 on the other surface side (outer
surface side) of side plate 5 than the tapered surface 35 in the inner surface of through hole 27
is a straight line in which the size of the sectional shape orthogonal to the penetrating direction
does not change. It is formed as a portion 36.
[0070]
Thus, when the tapered surface 35 is provided on the inner surface of the through hole 27, when
the side plate 5 is embedded in the resin of the resin case 3, the engagement between the resin
filled in the through hole 27 and the through hole 27 is strengthened. As a result, the side plate 5
is more firmly held and fixed to the resin case 3. FIG. 6 (c) shows the case where the through
holes 27 are formed as shown in FIG. 6 (a) and the side plate 5 is embedded in the resin of the
resin case 3. In this way, It is more firmly held and fixed.
[0071]
Further, even when the side plate 5 is disposed along the inner surface of the placement portion
6 of the resin case 3, as the tapered surface 35 goes from the inner surface side of the side plate
5 to the outer surface side (that is, the inner surface side of the placement portion 6) If the size of
the cross-sectional shape orthogonal to the penetration direction of the through hole 27 is
reduced, the fit between the through hole 27 and the projection 28 fitted to the through hole 27
becomes strong, and the through hole 27 is formed. As a result, the side plate 5 is more firmly
held and fixed to the resin case 3 as a result. FIG. 6 (d) shows the case where the through holes
27 are formed as shown in FIG. 6 (b) and the side plate 5 is disposed along the inner surface of
the placement portion of the resin case 3, and in this way And the resin case 3 is more firmly
held and fixed.
[0072]
Yet another shape of the through hole 27 is shown in FIG. In this example, a protrusion 37
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20
protruding from one surface of the side plate 5 is provided on the opening edge of the through
hole 27 on the one surface side of the side plate 5 over the entire circumference. 7 (a) to 7 (c)
show the projections 37 formed to have substantially uniform heights at the tips, and FIGS. 7 (d)
to 7 (f) show the projections 37 as the projections 37. It shows what was formed in the uneven |
corrugated shape where the peak part 38 and the valley part 39 were located in a line by turns
over the perimeter at a tip.
[0073]
Such a protrusion 37 can be formed, for example, so that the opening edge of the through hole
27 is raised toward one surface side of the side plate 5 when forming the through hole 27 by
burring. Further, in the illustrated example, the protrusions 37 are provided so as to protrude
only on one surface side of the side plate 5, but the protrusions 37 may be provided so as to
protrude toward both surface sides of the side plate 5.
[0074]
In the example shown in FIG. 7, the projections 37 are formed on the outer surface side of the
side plate 5, and the side plate 5 is disposed along the inner surface of the placement portion 6
of the resin case 3. Not only is the protruding protrusion 28 fitted in the through hole 27, but the
protrusion 37 bites into the resin of the resin case 3 so that the side plate 5 is further firmly held
and fixed by the resin case 3. It is possible.
[0075]
Also, in the case where the side plate 5 is embedded in the resin of the resin case 3, not only is
the resin of the resin case 3 filled in the through holes 27, but the projections 37 bite into the
resin of the resin case 3. The side plate 5 can be more firmly held and fixed by the resin case 3.
FIGS. 7 (c) and 7 (f) show the state in which the side plate 5 is embedded in the resin case 3,
respectively. Thus, the side plate 5 can be further firmly held and fixed by the resin case 3. It is a
thing.
[0076]
Here, as shown in FIGS. 7 (d) to 7 (f), when the end of the projection 37 is formed in a concavo-
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21
convex shape, the engagement between the projection 37 and the resin becomes stronger, and
the side plate 5 It can be held and fixed more firmly.
[0077]
Yet another shape of the through hole 27 is shown in FIG.
In this example, the side plate 5 is partially sheared and raised by partially applying a load to the
side plate 5 to form the through hole 27, and the cut and raised portion 40 is partially connected
to the periphery of the through hole 27. It is left as it is. In FIG. 8A, the through hole 27 is formed
by partially cutting and raising the side plate 5 in a rectangular shape, and both side ends of the
cut and raised portion 40 are connected to the periphery of the through hole 27. It is left to be
disposed on one side. 8B, the through hole 27 is formed by partially cutting and raising the side
plate 5 in a rectangular shape, and one end of the cut and raised portion 40 is connected to the
periphery of the through hole 27. It is left to be disposed on one side.
[0078]
In the example shown in FIG. 8, when the cut and raised portion 40 is formed on the outer
surface side of the side plate 5 and the side plate 5 is disposed along the inner surface of the
placement portion 6 of the resin case 3, Not only the protrusion 28 projecting from the inner
surface is engaged with the through hole 27, but the cut and raised portion 40 bites into the
resin of the resin case 3, and the side plate 5 is further firmly held by the resin case 3. It can be
fixed.
[0079]
Further, also when the side plate 5 is embedded in the resin of the resin case 3, not only the resin
of the resin case 3 is filled in the through hole 27 but also the cut and raised portion 40 bites
into the resin of the resin case 3 Thus, the side plate 5 can be more firmly held and fixed by the
resin case 3.
[0080]
In the example shown in FIG. 9, in the configuration shown in FIG. 1, at the opening edge of the
metal case 2 on the opposite side to the diaphragm 4, the rib 10 protruding outward over the
13-04-2019
22
entire circumference is formed on the end of the side plate 5. It is formed.
The rib 10 may be formed over the entire periphery at the end of the side plate 5 as shown, or
may be formed in a shape in which a part of the rib 10 is broken, and the end of the curved
portion 26 of the side plate 5 For example, it may be formed only in a partial area of the end of
the side plate 5.
[0081]
The metal case 2 does not have to be designed to have a thickness designed to form a thin
portion or a thick portion, and its shape is simple, so a single piece of metal is not required to be
subjected to a complicated forging step or cutting step. It can be inexpensively and easily
manufactured by subjecting a plate material made of aluminum to simple bending and drawing,
and is formed by drawing a metal plate such as an aluminum plate, for example.
That is, first, a disc-shaped metal plate is drawn to be formed into a bottomed cylindrical shape
having a flange. This drawing processing can be performed through three steps of drawing
processing of shallow drawing, middle drawing and deep drawing. Then, the connecting portion
4a between the bottom portion and the peripheral surface portion is drilled at two places using a
punch or the like to form a pair of openings 9 and leave the flange portion as a portion to be the
rib 10 The metal case 2 is formed by cutting.
[0082]
The metal case 2 is formed integrally with the resin case 3 by arranging the side plate 5 along
the inner surface of the arrangement portion 6 in the arrangement portion 6 of the resin case 3
as in the case of FIG. A rib receiving portion 11 having a shape corresponding to the rib 10 of the
metal case 2 is recessed over the entire circumference on the inner periphery of the opening on
the side opposite to the side closed by the diaphragm 4 of the portion 6 The rib 10 is disposed in
the rib receiving portion 11.
[0083]
By forming the ribs 10 on the side plate 5 in this manner, the rigidity of the side plate 5 itself is
improved, and the transmission of vibration from the diaphragm 4 to the side plate 5 is further
13-04-2019
23
suppressed.
Further, by holding the rib 10 by the rib receiving portion 11, the side plate 5 is further firmly
held and fixed by the resin case 3, the attachment strength of the side plate 5 is further
improved, and the vibration from the diaphragm 4 to the side plate 5 The transmission efficiency
of the diaphragm 4 is further improved, and the transmission output of the ultrasonic wave by
the vibration of the diaphragm 4 is further improved.
[0084]
In the example shown in FIGS. 10 (a) to 10 (c), in the configuration shown in FIG. 1, all along the
outer surface of the end portion of the side plate 5 at the open end edge of the metal case 2
opposite to the diaphragm 4. The cap body 41 is provided over the circumference. The cap body
41 is formed in a ring shape, and is provided by press-fitting the side plate 5 into the opening on
the inner side of the cap body 41 or bonding the cap body 41 to the side plate 5.
[0085]
The cap body 41 can be formed of a material softer than the metal case 2, for example, a resin
molded product, rubber or the like. In this case, the vibration of the metal case 2 caused by the
vibration of the diaphragm 4 can be absorbed and attenuated, and the generation of
reverberation in the diaphragm 4 can be further suppressed.
[0086]
The cap body 41 can also be formed of a material harder than the metal case 2. For example,
when the metal case 2 is formed of an aluminum plate, it may be formed of steel, ceramic,
cemented carbide or the like. it can. In this case, the rigidity of the side plate 5 supporting the
diaphragm 4 can be further improved, the vibration efficiency of the diaphragm 4 is further
improved, and the transmission output of ultrasonic waves by the vibration of the diaphragm 4 is
further improved. It is possible to
[0087]
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24
At this time, the metal case 2 is integrally formed with the resin case 3 by arranging the side
plate 5 along the inner surface of the arrangement portion 6 in the arrangement portion 6 of the
resin case 3 as in the case of FIG. However, on the inner circumference of the opening opposite
to the side closed by the diaphragm 4 of the placement portion 6, the cap receiving portion 54
having a shape corresponding to the cap body 41 provided on the metal case 2 is entirely The
cap body 41 is recessed around the circumference, and the cap body 41 is disposed in the cap
receiving portion 54.
[0088]
Further, as shown in FIG. 10 (d), the cap body 41 is formed in a ring shape, and a fitting groove
42 opened toward the opening direction of the cap body 41 is provided over the entire
circumference on this one surface side. You may use what.
In this case, the cap body 41 is provided by fitting the fitting groove 42 to the tip of the end of
the side plate 5. Further, in the illustrated example, the cross-sectional shape of the placement
portion 6 of the resin case 3 is formed in a shape smaller than the shape of the diaphragm 4 over
the entire region, and all the side plates 5 of the metal case 2 are resin. It is buried in the case 3
and the side plate 5 is more firmly held and fixed. At this time, the cap body 41 is embedded in
the resin case 3 except for the portion where the surface is exposed at the end face of the resin
case 3.
[0089]
In the example shown in FIG. 11, in the configuration shown in FIG. 2, the folded-back portion 43
is formed at the end of the flat portion 25 of the side plate 5 of the metal case 2 opposite to the
diaphragm 4. The folded portion 43 is extended from the end of the flat portion 25, and is folded
outward from the end of the flat portion 25 so as to be disposed along the outer surface of the
flat portion 25. It is molded.
[0090]
At this time, the metal case 2 is disposed along the inner surface of the placement portion 6 of
the resin case 3 and the curved portion 26 is embedded in the resin case 3 as in the case of FIG.
2. 3 is integrally formed, but the inner periphery of the opening on the side opposite to the side
closed by the diaphragm 4 of the placement portion 6 has a shape corresponding to the turn-
13-04-2019
25
back portion 43 provided on the metal case 2 The folded-back receiving portion 44 is recessed at
a position corresponding to the folded-back portion 43, and the folded-back portion 43 is
disposed in the folded-back receiving portion 44.
[0091]
By forming the folded portion 43 in the side plate 5 in this manner, the rigidity of the side plate 5
itself is improved, transmission of vibration from the diaphragm 4 to the side plate 5 is further
suppressed, and the vibration efficiency of the diaphragm 4 is further improved. The
transmission output of the ultrasonic wave by the vibration of the diaphragm 4 can be further
improved.
Further, by holding the folded back portion 43 by the folded back receiving portion 44, the side
plate 5 can be more firmly held and fixed by the resin case 3.
[0092]
Here, as shown in FIG. 12, the folded-back portion 43 is provided not only on the curved surface
portion 26 but also on the flat portion 25 at the end of the side plate 5 on the opposite side to
the diaphragm 4. It may be formed over the entire circumference of the opening of the side plate
5. In this case, the rigidity of the side plate 5 can be further improved.
[0093]
In the example shown in FIG. 13, in the configuration shown in FIG. 3, the reinforcing member
45 is provided on the inner surface of the flat portion 25 of the side plate 5 of the metal case 2
along the step 33. Here, the reinforcing member 45 is disposed in contact with the inner surface
of the upper piece 33 a of the step portion 33 and the flat portion 25. The reinforcing member
45 can be formed of a metal material such as aluminum, stainless steel, steel or the like, and the
reinforcing member 45 is disposed in contact with the inner surface of the flat portion 25. In
providing the reinforcing member 45, the reinforcing member 45 is attached to the surface of
the flat portion 25 by adhesion, welding or the like, and a convex portion is formed on one of the
reinforcing member 45 and the flat portion 25 and the convex portion is formed on the other.
Form a fitting hole to be press-fit and fitted, and attach the reinforcing member 45 firmly to the
13-04-2019
26
flat portion 25 by, for example, attaching the reinforcing member 45 by fitting the convex
portion and the fitting hole. preferable. Here, the side plate 5 of the metal case 2 is embedded in
the resin case 3 and disposed, and the reinforcing member 45 is also embedded in the resin case
3.
[0094]
By arranging the reinforcing member 45 in this manner, the rigidity of the flat portion 25
directly connected to the diaphragm 4 is further improved, and the transmission of the vibration
from the diaphragm 4 to the side plate 5 is further suppressed. The vibration efficiency of No. 4
can be further improved, and the transmission power of ultrasonic waves due to the vibration of
the diaphragm 4 can be further improved.
[0095]
When providing the reinforcing member 45, it can also be as shown in FIG.
In the example shown in FIG. 14, in the configuration shown in FIG. 2, a reinforcing member 45
similar to that shown in FIG. 13 is provided on the outer surface of the flat portion 25 of the
metal case 2 on the diaphragm 4 side. The reinforcing member 45 is disposed in contact with the
outer surface of the flat portion 25. As in the case of FIG. 13, the reinforcing member 45 can be
formed by bonding, welding, fitting of the convex portion and the fitting hole, or the like. It is
preferable to attach firmly to the side plate 5. Here, the outer surface of the flat portion 25 is
disposed along the inner surface of the placement portion 6 of the resin case 3, and the
reinforcing member 45 is disposed in a state of being embedded in the resin case 3.
[0096]
In the example shown in FIG. 15, in the metal case 2 in which the step 33 shown in FIGS. 3 and 4
is formed, the recess 47 and the protrusion 46 are integrally formed on the inner surface of the
step 33.
[0097]
In FIG. 15A, as shown in detail in FIG. 22, the connecting portion between the upper piece 33a of
the step portion 33 and the flat portion 25 of the side plate 5 is formed into a triangle by
bending inward at a plurality of points. The convex portion 46 is provided on the inner surface of
the connection portion between the upper piece 33a and the flat portion 25, and the connection
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27
portion between the upper piece 33a and the lower piece 33b of the step portion 33 is bent in a
triangle shape toward a plurality of places. Thus, the concave portion 47 is provided on the inner
surface of the connection portion between the upper piece 33a and the lower piece 33b.
[0098]
15B shows that the upper piece 33a of the step portion 33 is partially bent from the outer
surface toward the inner surface by pressing with a jig or the like to form a plurality of convex
portions 46 on the inner surface of the upper piece 33a. Is provided.
[0099]
By integrally forming the recess 47 and the projection 46 in the step 33 in this manner, the
rigidity of the side plate 5 can be further improved by improving the rigidity of the step 33, and
the vibration efficiency of the diaphragm 4 is further improved. Thus, the transmission power of
ultrasonic waves due to the vibration of the diaphragm 4 can be further improved.
Further, the flat portion 25 of the side plate 5 is further firmly held and fixed to the resin case 3
by causing the concave portion 47 and the convex portion 46 to be engaged with the resin of the
resin case 3, and the mounting strength is further improved. Thereby, the transmission of the
vibration from the diaphragm 4 to the side plate 5 is suppressed, the vibration efficiency of the
diaphragm 4 is further improved, and the transmission output of the ultrasonic wave by the
vibration of the diaphragm 4 is further improved.
[0100]
In the example shown in FIG. 16, in the metal case 2 in which the stepped portion 33 as shown in
FIGS. 3 and 4 is formed, a plurality of connecting portions of the upper piece 33a of the stepped
portion 33 and the flat portion 25 of the side plate 5 are By cutting and raising on the side, the
cut and raised portion is formed as a plurality of convex portions 46 projecting to the inner
surface side of the metal case 2.
In the illustrated example, one end of the convex portion 46 is connected to the flat portion 25
and the other end is connected to the upper piece 33a, and the both ends are sheared and cut
from the flat portion 25 or the upper piece 33a. It is cut and raised so as to protrude on the inner
13-04-2019
28
surface side of the case 2.
[0101]
Thus, when the raised portion is integrally formed by cutting and raising the step portion 33, the
rigidity of the side plate 5 can be further improved by improving the rigidity of the step portion
33, and the vibration efficiency of the diaphragm 4 is further improved. Thus, it is possible to
further improve the transmission power of ultrasonic waves due to the vibration of the
diaphragm 4.
Further, the flat portion 25 of the side plate 5 is further firmly held and fixed to the resin case 3
by causing the convex portion 46 to be engaged with the resin of the resin case 3 and the
mounting strength is further improved. The transmission of the vibration from 4 to the side plate
5 is suppressed, the vibration efficiency of the diaphragm 4 is further improved, and the
transmission output of the ultrasonic wave by the vibration of the diaphragm 4 is further
improved.
[0102]
In the example shown in FIG. 17, in forming the concavities and convexities in the side plate 5,
the side plate 5 is subjected to shearing to form a plurality of concave portions 51 and convex
portions 50 on the surface of the side plate 5.
[0103]
In the example of illustration, the uneven | corrugated streak 52 which the some recessed part
51 and the convex part 50 are alternately located in a wavelike form by shear processing is
formed.
The plurality of concavo-convex streaks 52 are formed in parallel. Moreover, in the uneven |
corrugated streaks 52 which adjoin, the recessed part and the convex part are arrange |
positioned alternately.
[0104]
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29
A shearing method for forming such an uneven stripe 52 is shown in FIG. In the example of
illustration, it shears by passing the part in which side plate 5 of metal board material 13 which
forms metal case 2 is formed between a pair of forming rolls 65. Here, the forming roll has its
center on the same axis different from the above between adjacent forming roll pieces 65a of the
plurality of disk-shaped forming roll pieces 65a arranged to have the centers on the same axis. It
is comprised as a shape by which the disk-shaped shaping | molding roll piece 65b arranged so
that it had may be arrange | positioned, respectively. When the pair of forming rolls 65 are
arranged in parallel and rotated and rotated, the shape of the gap between the pair of forming
rolls 65 changes as needed, and the plate material 13 is allowed to pass through the pair of
rotating forming rolls 65. As a result, the shearing process is performed to form the uneven
streaks 52.
[0105]
In the example shown in FIG. 18A, the side plate 5 is formed by bending the side plate 5 to form
a plurality of projections 50 and recesses 51 alternately on the surface of the side plate 5 when
forming irregularities on the side plate 5. The side surface 53 of the protrusion 50 protruding
from the surface of the side plate 5 is inclined such that the side surface 53 protrudes outward as
it goes to the tip end side of the protrusion 50, and the protrusion 50 is formed in an undercut
shape It is. When such a convex portion 50 is formed on the outer surface of the side plate 5, the
side plate 5 is disposed along the inner surface of the disposition portion 6 of the resin case 3 or
the side plate 5 is disposed buried in the resin case 3. The convex portion 50 and the resin case 3
are firmly engaged with each other, and the side plate 5 is further firmly held and fixed to the
resin case 3.
[0106]
In the example shown in FIG. 18B, as also shown in detail in FIG. 24, the recess is formed of a
recess 51 having a triangular shape in plan view and a protrusion 50 having a triangular shape
in plan view adjacent to one side of the recess 51. A plurality of pairs of 51 and convex portions
50 are formed. The depth dimension of the concave portion 51 is formed to be deeper toward
the adjacent convex portion side, and the projection dimension of the convex portion 50 is
formed to be higher toward the adjacent concave portion 51 side. The side surface 53 of the
convex portion 50 on the concave portion 51 side is inclined so as to protrude outward as it goes
to the tip end side of the convex portion 50. When such convex portions 50 and concave
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30
portions 51 are formed on the outer surface of the side plate 5, the side plate 5 is disposed along
the inner surface of the placement portion 6 of the resin case 3 or the side plate 5 is disposed
buried in the resin case 3. In this case, the convex portion 50 and the resin case 3 are firmly
engaged with each other, and the side plate 5 is further firmly held and fixed to the resin case 3.
[0107]
In forming the concave portion 51 and the convex portion 50, the concave portion 51 is
engraved on the surface of the side plate 5, and the portion carved from the side plate 5 is raised
by raising the concave portion 51. Can be formed as the convex portion 50. That is, it can be
formed by a skive such as an aluminum grater.
[0108]
In each of the above examples, the diaphragm 4 and the side plate 5 constituting the metal case
2 are integrally formed, so the metal case 2 is easily formed by bending or drawing a single metal
plate. It is something that can be done.
[0109]
On the other hand, in forming the metal case 2, the metal case 2 can be configured after the
diaphragm 4 and the side plate 5 are separately formed.
In this case, the transmission of the vibration from the diaphragm 4 to the side plate 5 which is a
separate body is suppressed, and hence the transmission output from the diaphragm 4 is further
improved. Further, the vibration in the side plate 5 is reduced, so that the resonance of the
vibration is further suppressed and the vibration damping capability is further improved.
[0110]
An example in which the diaphragm 4 and the side plate 5 are separately formed is shown below.
[0111]
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31
In the example shown in FIG. 19, in the configuration shown in FIG. 2, the side plate 5
constituting the metal case 2 and the diaphragm 4 are separately formed.
When such a case body 1 is to be molded, it is disposed in a molding die in a state where one end
of the side plate 5 and the peripheral edge of the diaphragm 4 are in contact, and the resin is
filled in the molding die and cured. Thus, the resin case 3 can be insert-molded. At this time, the
metal case 2 is configured by the diaphragm 4 and the side plate 5 being held and fixed by the
resin case 3.
[0112]
In the example shown in FIG. 20, when forming the side plate 5 and the diaphragm 4 as separate
bodies as shown in FIG. 19, all of the ribs 48 projecting outward are formed at the edge of the
side plate 5 on the diaphragm 4 side. It is formed over the circumference. Then, when molding
the case body 1 by insert molding, the rib 48 of the side plate 5 and the peripheral edge of the
diaphragm 4 are placed in contact with each other in the molding die, and the molding die is
filled with resin. The resin case 3 can be insert-molded by curing. At this time, the metal case 2 is
configured by the diaphragm 4 and the side plate 5 being held and fixed by the resin case 3. In
this case, by arranging the diaphragm 4 in contact with the side plate 5 by the ribs 48, the
contact area between the diaphragm 4 and the side plate 5 is increased, and hence the side plate
5 and the diaphragm 4 are brought into contact with each other. It becomes easy to arrange in
the mold in the above state, and the contact between the side plate 5 and the diaphragm 4 can be
easily ensured, and the electrical connection between the side plate 5 and the diaphragm 4 can
be ensured. It is a thing.
[0113]
In the example shown in FIG. 21, in forming the side plate 5 and the diaphragm 4 as separate
bodies, the side plate 5 and the diaphragm 4 are bonded in a state where one end of the side
plate 5 is in contact with the peripheral edge of the diaphragm 4 Then, the side plate 5 and the
diaphragm 4 are fixed.
[0114]
21 (a) shows the diaphragm 4 and the outer and inner sides of the metal case 2 in a state where
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32
one end of the side plate 5 is brought into contact with the peripheral edge of the diaphragm 4
prior to the insert molding of the case body 1. An adhesive 49 is disposed on the side of the joint
portion of the side plate 5, and the diaphragm 4 and the side plate 5 are bonded in a state of
being electrically connected. However, bonding is performed by soldering, brazing, welding, etc.
You can also
Then, the metal case 2 formed by bonding the diaphragm 4 and the side plate 5 in this manner is
disposed in a molding die, resin is filled and cured in the molding die, and the resin case 3 is
insert-molded. It is
[0115]
In FIG. 21 (b), only the side plate 5 is disposed in the molding die, resin is filled and cured in this
molding die, and the resin case 3 is insert-molded, and then one end of the side plate 5 and the
diaphragm 4 And the adhesive 49 is disposed on the side of the joint portion between the
diaphragm 4 and the side plate 5 and the joint portion between the diaphragm 4 and the resin
case 3 in this state. Although the side plates 5 are adhered in a state of being electrically
connected, they may be adhered by soldering, brazing, welding or the like. In this case, the
diaphragm 4 is firmly held and fixed to the resin case 3 by bonding between the diaphragm 4
and the resin case 3 by soldering, brazing, welding or the like.
[0116]
As described above, in the ultrasonic oscillator according to claim 1 of the present invention, the
piezoelectric element is disposed on the inner surface side of the closed surface of the case body
having one end opened and the other end closed. In the ultrasonic transducer, the closed surface
is formed as a vibrating surface, and the case body is constituted by a resin case made of a
synthetic resin material and a metal case formed of a plate material made of metal, and this
metallic case is a vibrating surface And a side plate which is embedded or closely held by being
closely held in the resin case, and a through hole is provided in a portion of the side plate which
is buried or closely held in the resin case, the resin case is formed in the through hole of the side
plate The side plate is firmly held and fixed to the resin case, and as a result, the diaphragm is
firmly held and fixed to the resin case, and the piezoelectric element vibrates and the diaphragm
is Side plate when vibrating Vibration is suppressed, in which it is possible to improve the
transmit output from the vibration plate. Further, the transmission of the vibration from the
diaphragm to the side plate or the resin case is suppressed, the occurrence of resonance is
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suppressed, and the vibration damping capability of the diaphragm can be improved. Therefore,
this ultrasonic transducer can be suitably used to construct an ultrasonic sensor.
[0117]
Further, in the invention according to claim 2, in addition to the configuration according to claim
1, a tapered surface is formed on the inner peripheral surface of the through hole of the side
plate in which the size of the sectional shape orthogonal to the through direction of the through
hole changes. The side plate is firmly held and fixed to the resin case more firmly by the biting
between the through hole of the side plate and the resin of the resin case filled in the through
hole becoming stronger, and the diaphragm And the vibration damping ability can be further
improved.
[0118]
Further, in the invention according to claim 3, in addition to the configuration according to claim
1 or 2, in order to form a protrusion on the opening peripheral edge of the through hole of the
side plate, the biting of the side plate and the resin of the resin case The side plate is further
firmly held and fixed to the resin case, and the transmission power from the diaphragm can be
further improved and the vibration damping capability can be further improved.
[0119]
In the invention according to claim 4, in addition to the configuration according to any one of
claims 1 to 3, since the through hole is formed by cutting and raising the surface of the side
plate, the resin of the side plate and the resin case The side plate is held and fixed to the resin
case more firmly, and the transmission power from the diaphragm can be further improved and
the vibration damping capability can be further improved. It is.
[0120]
In the ultrasonic oscillator according to claim 5 of the present invention, the piezoelectric
element is disposed on the inner surface side of the closed surface of the case body having one
end opened and the other end closed, and the closed surface is formed as a vibrating surface In
the ultrasonic transducer, the case body is composed of a resin case made of a synthetic resin
material and a metal case formed of a plate material made of metal, and the metal case is
embedded in a diaphragm and a resin case forming a vibrating surface The side plate is formed
of a side plate which is held or held in close contact, and a step is formed in a portion of the side
plate embedded or in close contact with the resin case, so that the rigidity of the side plate is
improved by the step and the piezoelectric element vibrates. When the diaphragm vibrates, the
vibration of the side plate is suppressed, and the transmission of the vibration from the
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diaphragm to the side plate or the resin case is suppressed, and the transmission output from the
diaphragm can be further improved. It is.
[0121]
In the invention according to the sixth aspect, in addition to the configuration according to the
fifth aspect, since the concavities and convexities are formed in the step portion of the side plate,
the rigidity of the side plate can be further improved by improving the rigidity of the step
portion. When the element vibrates and the diaphragm vibrates, the vibration of the side plate is
suppressed, and the transmission of the vibration from the diaphragm to the side plate and the
resin case is suppressed, and the transmission output from the diaphragm is further improved. It
is something that can be done.
In addition, by engaging the unevenness with the resin of the resin case, the flat portion of the
side plate is more firmly held and fixed to the resin case, and the mounting strength of the side
plate is further improved. Also from this diaphragm to the side plate The transmission of
vibration is suppressed, and the transmission power from the diaphragm can be further
improved and the vibration damping capability can be further improved.
[0122]
In the seventh aspect of the invention, in addition to the configuration of the sixth aspect, since
the unevenness of the step portion of the side plate is formed by cutting and raising, the rigidity
of the side plate is further improved by improving the rigidity of the step portion. When the
piezoelectric element vibrates and the diaphragm vibrates, the vibration of the side plate is
suppressed, the transmission of the vibration from the diaphragm to the side plate or the resin
case is suppressed, and The wave output can be further improved.
Further, by engaging the concave portion and the convex portion with the resin of the resin case,
the flat portion of the side plate is more firmly held and fixed to the resin case, the attachment
strength of the side plate is further improved, and the wave transmission from the diaphragm
The output can be further improved and the vibration damping ability can be further improved.
[0123]
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In the ultrasonic transducer according to claim 8 of the present invention, the piezoelectric
element is disposed on the inner surface side of the closed surface of the case body having one
end opened and the other end closed, and the closed surface is formed as a vibrating surface In
the ultrasonic transducer, the case body is composed of a resin case made of a synthetic resin
material and a metal case formed of a plate material made of metal, and the metal case is
embedded in a diaphragm and a resin case forming a vibrating surface The side plate is made up
of a side plate which is held or held in close contact, and the unevenness is formed in the portion
of the side plate which is embedded or in close contact with the resin case. When the plate
vibrates, the vibration of the side plate is suppressed, the transmission of the vibration from the
diaphragm to the side plate or the resin case is suppressed, and the transmission output from the
diaphragm can be further improved. is there.
In addition, by engaging the unevenness with the resin of the resin case, the flat portion of the
side plate is more firmly held and fixed to the resin case, and the mounting strength of the side
plate is further improved. The wave output can be further improved and the vibration damping
ability can be further improved.
[0124]
Further, in the invention according to claim 9, in addition to the configuration according to claim
8, since the unevenness of the side plate is formed by shearing the side plate, the rigidity of the
side plate is improved by the unevenness and the piezoelectric element vibrates. When the
diaphragm vibrates, the vibration of the side plate is suppressed, and the transmission of the
vibration from the diaphragm to the side plate or the resin case is suppressed, and the
transmission output from the diaphragm can be further improved. It is.
In addition, by engaging the unevenness with the resin of the resin case, the flat portion of the
side plate is more firmly held and fixed to the resin case, and the mounting strength of the side
plate is further improved. The wave output can be further improved and the vibration damping
ability can be further improved.
[0125]
Further, in the invention according to claim 10, in addition to the configuration according to
claim 8, the side surface of the side plate protrudes outward as the side surface of the convex
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portion protruding from the side plate goes to the tip end side of the convex portion. Since it is
formed to be inclined as described above, the biting of this unevenness and the resin of the resin
case becomes stronger, the flat portion of the side plate is more firmly held and fixed to the resin
case, the mounting strength of the side plate further improves, and vibration It is possible to
further improve the transmission power from the plate and to further improve the vibration
damping capability.
[0126]
Further, in the invention according to an eleventh aspect, in addition to the configuration
according to any one of the first to tenth aspects, a rib is formed on the opposite end of the side
plate of the metal case on the side opposite to the diaphragm. The ribs improve the rigidity of the
side plate, and when the piezoelectric element vibrates to vibrate the diaphragm, the vibration of
the side plate is suppressed, and the transmission of the vibration from the diaphragm to the side
plate or the resin case is suppressed. The transmission output from the diaphragm can be further
improved.
[0127]
In the invention according to claim 12, in addition to the configuration according to any one of
claims 1 to 11, since the cap body is provided at the end of the side plate of the metal case
opposite to the diaphragm, the hardness of the cap body By adjusting the above, it is possible to
absorb and damp the vibration of the metal case or to further improve the rigidity of the side
plate.
[0128]
Further, in the invention according to claim 13, in addition to the constitution according to claim
12, the cap body is formed of a softer material than the resin case, so that the vibration of the
metal case accompanying the vibration of the diaphragm is absorbed and attenuated. As a result,
the occurrence of reverberation in the diaphragm can be suppressed.
Therefore, when this ultrasonic transducer is applied to an ultrasonic sensor, after the diaphragm
is vibrated to generate an ultrasonic wave, the vibration is quickly alleviated and the reflected
wave can be received, and the sensitivity It is possible to form a good ultrasonic sensor.
[0129]
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Further, in the invention according to claim 14, in addition to the constitution according to claim
12, since the cap body is formed of a material harder than the resin case, the rigidity of the side
plate for supporting the diaphragm can be further improved. When the piezoelectric element
vibrates and the diaphragm vibrates, the vibration of the side plate is suppressed, and the
transmission of the vibration from the diaphragm to the side plate or the resin case is
suppressed, and the transmission output from the diaphragm is It can be further improved.
[0130]
In the invention according to claim 15, in addition to the configuration according to any one of
claims 1 to 14, since the end of the side plate of the metal case opposite to the diaphragm is
folded back, the side panel supporting the diaphragm The rigidity of the side plate can be further
improved, and when the piezoelectric element vibrates and the diaphragm vibrates, the vibration
of the side plate is suppressed, and the transmission of the vibration from the diaphragm to the
side plate or the resin case is suppressed. Therefore, it is possible to further improve the
transmission output from the diaphragm.
[0131]
According to the sixteenth aspect of the present invention, in addition to the configuration of any
one of the first to seventeenth aspects, since a reinforcing member formed of a rigid material is
provided to be in contact with the surface of the side plate of the metal case The rigidity of the
side plate supporting the plate can be further improved, and when the piezoelectric element
vibrates and the diaphragm vibrates, the vibration of the side plate is suppressed and the
vibration from the diaphragm is transmitted to the side plate or the resin case Can be
suppressed, and the transmission output from the diaphragm can be further improved.
[0132]
In the invention according to claim 17, in addition to the configuration according to any one of
claims 1 to 16, since the side plate of the metal case is formed in a cylindrical shape, the area of
the side plate can be improved, and the metal case and the resin case The area of the joint
portion between the metal case and the metal case can be improved to further improve the
mounting strength of the metal case to the resin case.
[0133]
According to the eighteenth aspect of the present invention, in addition to the constitution of any
one of the first to seventeenth aspects, the side plate constituting the metal case and the
diaphragm are integrally formed. It can be easily formed by processing or drawing processing.
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[0134]
According to the nineteenth aspect of the present invention, in addition to the configuration of
any one of the first to seventeenth aspects, the side plate and the diaphragm which constitute the
metal case are separately formed, and the side plate and the diaphragm are integrated with the
resin case. Since the side plate and the diaphragm are connected by molding, the transmission of
the vibration from the diaphragm to the side plate is suppressed to further improve the
transmission power from the diaphragm, and the vibration in the side plate is reduced.
Resonance is further suppressed, and the vibration damping ability can be further improved.
[0135]
Further, in the invention of claim 20, in addition to the constitution of claim 18, the side plate
and the diaphragm which constitute the metal case are separately formed, and the side plate and
the diaphragm are connected by adhesion, welding or brazing. The transmission of the vibration
from the diaphragm to the side plate is suppressed to further improve the transmission output
from the diaphragm, and the vibration of the side plate is reduced to further suppress the
resonance of the vibration, thereby reducing the vibration damping capacity. It can be further
improved.
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