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JPH06253396

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DESCRIPTION JPH06253396
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
transmission / reception integrated drip-proof ultrasonic microphone.
[0002]
2. Description of the Related Art A conventional drip-proof ultrasonic microphone is a
transmitter-receiver integrated type that is driven by inputting a tone burst wave to a
piezoelectric element such as a piezoelectric ceramic at a fixed or arbitrary period. As shown in
FIG. The vibrating body A is formed by fixing the piezoelectric element 1 on the inner surface of
the bottom of the vibration case 2 having a tapered portion on the bottom side of the bottomed
cylindrical shape. The vibration case 2 is formed of an aluminum material and serves as one of
the conductors when driving the piezoelectric element 1. The piezoelectric element 1 is formed
of a PZT-based piezoelectric ceramic in a disk shape, and has electrodes on both sides. One
surface of the piezoelectric element 1 is bonded to the inner surface of the bottom portion of the
vibration case 2 with an adhesive, and the other surface is connected to a lead wire 7 which is on
the + side. The terminal block 3 is formed of a printed circuit board in a disk shape, and is fitted
and fixed at a middle position in the vibration case 2 so as to prevent a change in resonance
frequency when the straight pipe portion of the vibration case 2 is held. ing. The terminal block 3
has + and-terminals 9 and 10, and the terminal 9 and the lead wire 7 are electrically connected
by the circuit of the printed circuit board. The terminal 10 is electrically connected to the
vibration case 2 by the circuit of the printed circuit board. A sound absorbing material 5 made of
a sound absorbing felt is installed between the piezoelectric element 1 and the terminal block 3
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in the vibration case 2. An elastic body 4 is disposed at the opening at the upper end of the
vibration case 2, and the elastic body 4 prevents the excitation of the terminal block 3 by the
vibration body A. Further, in the figure, 8 is a conductive adhesive and 11 is a solder.
[0003]
By the way, the drip-proof ultrasonic microphone as described above causes the following
problems when it is used as a human detection sensor for an automatic door or a car detection
sensor for a parking lot. . When the expansion and contraction in the radial direction of the
piezoelectric element 1 described above is converted into longitudinal vibration by the vibrator A,
since the vibration case 2 is a rigid body, an efficient amplitude can not be obtained and the
output sound pressure level becomes low. It has become impossible to detect an object at a
distance. Therefore, although there is a high possibility of being installed outdoors as an element
for an automatic door and a sensor for a parking lot, there is a problem that an open type
ultrasonic microphone having no drip-proof structure is used.
[0004]
The present invention has been made in view of the above problems, and it is an object of the
present invention to provide a drip-proof type supersonic detector capable of detecting a long
distance by mounting a resonator for amplifying the longitudinal vibration of the vibrator. An
acoustic microphone is provided.
[0005]
SUMMARY OF THE INVENTION In order to achieve the above object, the drip-proof ultrasonic
microphone according to claim 1 has a vibration case 2 formed in a bottomed cylindrical shape
and having a tapered portion on the bottom side, and a vibration case. Terminal block 3 having a
piezoelectric element 1 fixed to the inner surface of the bottom portion of 2 and positive and
negative terminals 9 and 10 fixed in the middle of the vibration case 2 and elasticity for sealing
the opening of the vibration case 2 A drip-proof type ultrasonic microphone comprising a body 4
and a sound absorber 5 provided between the piezoelectric element 1 and the terminal block 3,
wherein a resonator 12 is provided on the outer surface side of the bottom of the vibration case
2 Do.
[0006]
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2
The drip-proof ultrasonic microphone according to claim 2 is characterized in that a protective
net 13 is provided on the front side of the resonator 12.
The drip-proof ultrasonic microphone according to claim 3 is characterized in that an elastic
body 14 is mounted around the resonator 12.
The drip-proof ultrasonic microphone according to claim 4 is characterized in that an elastic
body 15 is attached to the open end of the conical cylindrical resonator 12.
[0007]
The drip-proof ultrasonic microphone according to claim 5 is characterized in that a projection
16 is integrally provided from the center of the bottom outer surface of the vibration case 2 and
the resonator 12 is attached to the projection 16. In the drip-proof ultrasonic microphone
according to claim 6, an opening hole 17 is provided at the center of the bottom of the vibration
case 2 and a resonator shaft 18 integrally provided in the resonator 12 is fitted in the opening
hole 17. It is characterized in that 12 is attached.
[0008]
The drip-proof ultrasonic microphone according to claim 7 is provided with an opening 19 so as
to penetrate the center of the bottom of the vibration case 2 and the center of the piezoelectric
element 1, and the resonator 12 has a resonant length which can be cut. The resonator shaft 20
is integrally provided, and the resonator shaft 20 is fitted in the opening 19 to attach the
resonator 12. The drip-proof ultrasonic microphone according to claim 8 is characterized in that
the resonator 12 is attached to the outer surface of the bottom of the vibration case 2 by
ultrasonic welding.
[0009]
The drip-proof ultrasonic microphone according to claim 9 has a length which can be cut in an
opening 21 provided so as to penetrate through the center of the bottom of the vibration case 2,
the center of the piezoelectric element 1 and the center of the resonator 12. It is characterized in
that the connected connecting shaft 22 is fitted.
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[0010]
In the drip-proof ultrasonic microphone according to the first aspect of the present invention, the
vibration of the vibrating body A at the time of transmission is amplified by the resonator 12
provided on the outer surface of the bottom of the vibration case 2, and at the same time By
improving the conversion efficiency, it is possible to easily detect an object at a long distance.
In the drip-proof ultrasonic microphone according to claim 2, the protective net 13 is provided
on the front surface of the resonator 12 to prevent damage to the resonator 12 and the vibration
case 2 due to an external impact, and to improve the weather resistance. it can.
[0011]
In the drip-proof ultrasonic microphone according to the third aspect of the present invention,
since the elastic body 14 is mounted around the resonator 12, the reverberation can be reduced
to improve the short-range detection performance. In the drip-proof ultrasonic microphone
according to the fourth aspect of the present invention, since the elastic body 15 is attached to
the opening end of the conical cylindrical resonator 12, the reverberation can be reduced and the
short-range detection performance can be improved.
[0012]
In the drip-proof ultrasonic microphone according to claim 5, a protrusion 16 is integrally
protruded from the center of the bottom outer surface of the vibration case 2 and the resonator
12 is attached to the protrusion 16 to hold the resonator 12. The strength can be improved. In
the drip-proof ultrasonic microphone according to claim 6, an opening hole 17 is provided at the
center of the bottom of the vibration case 2 and a resonator shaft 18 integrally provided in the
resonator 12 is fitted in the opening hole 17. By attaching 12, the holding strength of the
resonator 12 can be improved.
[0013]
The drip-proof ultrasonic microphone according to claim 7 is provided with an opening 19 so as
to penetrate the center of the bottom of the vibration case 2 and the center of the piezoelectric
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element 1, and the resonator 12 has a resonant length which can be cut. Since the sub shaft 20 is
integrally provided and the resonator shaft 20 is fitted into the opening 19 and the resonator 12
is attached, the length of the resonator shaft 20 is adjusted by cutting to adjust the resonance
frequency. be able to.
[0014]
In the drip-proof ultrasonic microphone according to the eighth aspect, the resonator holding
strength can be improved by ultrasonically welding the resonator 12 to the outer surface of the
bottom portion of the vibration case 2.
The drip-proof ultrasonic microphone according to claim 9 has a length which can be cut in an
opening 21 provided so as to penetrate through the center of the bottom of the vibration case 2,
the center of the piezoelectric element 1 and the center of the resonator 12. By fitting the
holding connection shaft 22, the resonance frequency can be adjusted by adjusting the length of
the connection shaft 22 in the completed product of the drip-proof ultrasonic microphone.
[0015]
First, a first embodiment shown in FIG. 1 will be described. The basic structure of the drip-proof
ultrasonic microphone according to the present invention is the same as that of the conventional
example, and therefore, substantially the same members will be denoted by the same reference
numerals and detailed description thereof will be omitted. Do. In the case of the present
embodiment, a conical cylindrical resonator 12 is attached to the bottom outer surface of the
vibration case 2 by adhesion with an adhesive 23. The resonator 12 is bonded to the outer
surface of the central portion of the bottom where the longitudinal vibration of the vibration case
2 peaks, and the longitudinal vibration is amplified by the excitation from the vibration case 2
and at the same time the reflected wave from the reflecting object is efficiently It is converted to
vibration.
[0016]
Next, a second embodiment shown in FIG. 2 will be described. As in the first embodiment, the
resonator 12 is attached, and the cylindrical collar 24 is fitted on the outer periphery of the
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vibration case 2 and held by press fitting or bonding. A metal protective mesh 13 such as a wire
mesh is attached to the opening of the collar 24 on the front side to which the resonator 12 is
attached. By providing the protection network 13 on the front side of the resonator 12, damage
to the resonator 12 and the vibration case 2 due to external impact is prevented.
[0017]
Next, a third embodiment shown in FIG. 3 will be described. In the case of the present
embodiment, in the second embodiment, the elastic body 14 is loaded in a portion surrounded by
the outer periphery of the resonator 12, the outer periphery of the tapered portion of the
vibration case 2, and the inner periphery of the collar 24. The elastic body 14 is formed of a
member such as silicon having a small change in visco-elasticity due to a temperature change,
suppresses unnecessary vibration at the time of amplitude of the resonator 12, reduces
reverberation, and enables detection of a near object.
[0018]
Next, a fourth embodiment shown in FIG. 4 will be described. An elastic body 15 is mounted
between the opening edge of the resonator 12 and the tapered portion of the vibration case 2.
This elastic body 15 is also formed of a member such as silicon having a small change in viscoelasticity due to temperature change, suppresses unnecessary vibration at the time of the
amplitude of the resonator 12, reduces reverberation, and enables detection of short-distance
objects. There is.
[0019]
Next, a fifth embodiment shown in FIG. 5 will be described. In the case of the present
embodiment, a shaft-like protrusion 16 is protruded downward from the center of the bottom of
the vibration case 2, an opening 25 is bored in the center of the resonator 12, and the protrusion
16 is an opening 25 is attached and reinforced by adhesion with an adhesive 23. By attaching
the resonator 12 in this manner, the holding strength of the resonator 12 can be improved.
[0020]
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Next, a sixth embodiment shown in FIG. 6 will be described. In the case of this embodiment, an
opening hole 17 is provided at the center of the bottom of the vibration case 2, and a resonator
shaft 18 is provided integrally with the resonator 12. Then, the resonator shaft 18 is fitted into
the opening hole 17, and after fitting, it is reinforced by adhesion with the adhesive 23, and the
holding strength of the resonator 12 is stabilized. Next, a seventh embodiment shown in FIG. 7
will be described. An opening 19 is provided so as to penetrate through the center of the bottom
of the vibration case 2 and the center of the piezoelectric element 1, and a resonator shaft 20
having a cuttable length is integrally provided to the resonator 12. Then, the resonator shaft 20
is fitted into the opening hole 19, and the length of the resonator shaft 20 is adjusted as
necessary, and after fitting, it is reinforced by adhesion with the adhesive 23. In this case, the
holding strength of the resonator 12 can be improved, and at the same time the length of the
resonator axis 20 can be adjusted to adjust the resonance frequency.
[0021]
Next, an eighth embodiment shown in FIG. 8 will be described. In the case of the present
embodiment, the resonator 12 is attached to the center of the outer surface of the bottom of the
vibration case 2 by ultrasonic welding. 27 is a welding part. In this case, the metal connection
between the vibration case 2 and the resonator 12 can be stabilized to stabilize the holding of the
resonator 12. Next, a ninth embodiment shown in FIG. 9 will be described. In the case of this
embodiment, an opening 21 is provided so as to penetrate the center of the bottom of the
vibration case 2, the center of the piezoelectric element 1 and the center of the resonator 12, and
the connecting shaft 22 having a cuttable length After being fitted into the opening hole 21 and
fitted, it is reinforced by adhesion with an adhesive 23. In this case, the holding strength of the
resonator 12 can be improved, and the resonance frequency adjustment in the finished product
state of the drip-proof ultrasonic microphone can be performed by cutting the connecting shaft
22.
[0022]
According to the present invention, since the resonator is provided on the outer surface side of
the bottom of the vibration case as described above, the vibration of the vibrating body during
transmission is amplified by the resonator provided on the outer surface of the bottom of the
vibration case. The piezoelectric conversion efficiency at the time of reflected wave reception can
be improved, and it becomes easy to detect an object at a long distance.
[0023]
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In the invention according to claim 2 of the present invention, since the protective net is
provided on the front surface of the resonator, damage to the resonator and the vibration case
due to external impact can be prevented, and weatherability can be improved. It is a thing.
In the invention according to the third aspect of the present invention, since the elastic body is
mounted around the resonator, it is possible to reduce the reverberation and improve the short
distance detection performance.
[0024]
In the invention according to the fourth aspect of the present invention, since the elastic body is
attached to the open end of the conical cylindrical resonator, the reverberation can be reduced
and the near distance detection performance can be improved. . In the invention according to
claim 5 of the present invention, since the projection is integrally provided from the center of the
bottom outer surface of the vibration case and the resonator is mounted on the projection, the
holding strength of the resonator can be improved. It is.
[0025]
According to the sixth aspect of the present invention, since the opening is provided at the center
of the bottom of the vibration case and the resonator axis integrally provided to the resonator is
fitted into the opening to attach the resonator. , The holding strength of the resonator can be
improved. In the invention according to claim 7 of the present invention, an opening is provided
so as to penetrate the center of the bottom of the vibration case and the center of the
piezoelectric element, and a resonator axis having a cuttable length is used as the resonator.
Since the resonator axis is fitted into the opening hole and attached to the resonator as well as
being integrated, the length of the resonator axis can be adjusted by cutting to adjust the
resonance frequency.
[0026]
In the invention according to the eighth aspect of the present invention, since the resonator is
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ultrasonically welded to the outer surface of the bottom of the vibration case, the resonator
holding strength can be improved. In the invention according to claim 9 of the present invention,
the connection having a severable length in the center of the bottom of the vibration case, the
center of the piezoelectric element and the opening provided to penetrate through the center of
the resonator. Since the shaft is fitted, the resonance frequency can be adjusted by adjusting the
length of the connecting shaft in the completed product of the drip-proof ultrasonic microphone.
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