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JPS51113590

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DESCRIPTION JPS51113590
12) 1 patent application 28 ”: 'iTo 50 3 T mouth break agency secretary 名称 name of inventor
inventor it'in', Tozuka Ward, Yokohama Prefecture Kanagawa Prefecture Tozuka Ward Tozuka
Ward 216 obligatory W eight] W cat storage 1 Seki 1 ′ ° ′ ′ Masaru Suzuki () 141 patent
applicants, Inc. 111 “I manufactured by V5r S“ 1- ”Telephone Tokyo 270-2.11] (large
admissions (). m name (7237) patent attorney thin 1) Toshiyuki,:. [F] Japanese Patent Office Open
Patent Publication ■ Japanese Patent Application Laid-Open No. 5l-j-135900 Japanese Patent
Application No. (1976) 10.6735055 Specification 1, Title of the Invention Langevin-Type
Vibrator 1, Title of the Invention Langevin-Type Vibrator
Langevin-type shooting mover
3. Detailed Description of the Invention The present invention is an improved VC @ of the
Langevin type imaging actuator of the electroacoustic transducer S. The object of the present
invention is to provide a Langevin type transducer which generates relatively low frequency
ultrasonic waves for use in water, for example ultrasonic waves of 1 to 8 KgZ, and high efficiency
and extremely high acoustic output. That is, the piezoelectric electrostrictive element itself is
compressed by a clamp made of a compression plate and a bolt, etc. to make the photographing
element be a cedar plate, and a metal material of the additional mass is adhered to both ends
thereof to resonate. It is a Langevin-type shooting mover formed in the unit. Conventionally, a
Langevin-type vibrator has a long overall length and an enormous weight when obtaining
ultrasonic waves of relatively low frequency (examples 1 to BKHz) 1, and therefore, an
electrostrictive element as a driving source and a gold member as an additional mass It is
considered useful to make the cross-sectional area ratio of the cross-sectional area extremely
large (the cross-sectional area of the electrostrictive element and the cross-sectional area of the
metal material). H-ll, such a Langevin-type imaging actuator is satisfied to generate an acoustic
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output up to a certain degree, but the high acoustic density produces a small cross-sectional area
of the electrostrictive element for high-power transmission. There is a problem for One of the
problems is that the electrostrictive element itself breaks down due to the generation of high
tensile stress following high power transmission. As is well known, the electrostrictive element is
a ceramic-specific compression vcIi! It is from the property of being weak to tension | pulling.
The other one is that the individual FIT between the electrostrictive element and the metal
material and the electrostrictive element is pulled apart due to the occurrence of the tension
EndPage: 1 stress at the time of temporary insertion. From this point of view, there has
conventionally been provided a Lange-Pan type imaging moving member in which an
electrostrictive element and an adhesive portion are biased in advance. In order to maintain the
mechanical connection between the electrostrictive element and the metal material by means of
an elastic device such as a Langevin-type moving element, such as a Langevin type moving
element consisting of an electrostrictive element and an adhesive and a pair of metal materials as
additional mass, Material @ All connected to apply a compression force to the electrostrictive
element and the adhesive. That is, FIGS. 1 to 4 & 0. For one type of prior art embodiment. To
illustrate, the electrostrictive elements 1a and 1b are adhered to each other by the adhesive 4C,
and the adhesive 4α is applied to both ends thereof. The metal material 2.3 which is an
additional mass is adhered by 4b. The electrostrictive elements 1α, 1b-Th and the adhesives 4α,
4b, 4c and the metal material are mechanically coupled to each other by the spring washer 6 and
the bord 5 so that they are not separated at the time of high power transmission. Maintain 1. And
is configured as a one-piece Langevin type mobile child. In the operation, power is applied by the
lead wires 7α, 7b, 7c, and electro-mechanical replacement is performed by the electrostrictive
element 1α 61b. In the method of the prior art as described above, there are the following 4M
fish.
The first is generally that the performance can only be grasped after the parts are assembled
together, and an intermediate process (for example, only adhesion of the electrostrictive
elements to each other does not add a compressive force, so almost electrostrictive elements). It
is the performance of itself. It is a shame to predict the final performance in). In this case, defects
in parts, for example, damage to the electrostrictive element, processing errors of the metal
material, adhesion due to assembly KD, errors in tightening, and the like are difficult to find
unless the end is reached. Unfortunately, if one of them suffers from a rough performance, all Iri
6 articles will fail. In the case of using a large number of expensive electrostrictive elements,
which are precisely and acoustically efficient, · · · · · vc scratching, including the labor required for
metal material and assembly, the damage is significant. It is extremely troublesome when it is
necessary to have an imaging actuator of various performances. The second point is that it is
difficult to apply uniform compressive force to the electrostrictive element and the adhesive. In
particular, when obtaining a low frequency Langevin type vibrator, the metal material becomes
extremely large, the bolt inevitably becomes long, and the jig for contacting and compressing
each part becomes extremely large, so each dimension The accuracy is degraded, and stress
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concentration in the compressed portion can not be avoided. Third, in the case of bolting, since
the head of the bolt is exposed at the other end of the metal material, water, moisture, etc.
penetrates into the inside of the electrostrictive element from between the metal material and the
bolt, and electrical insulation failure etc. A problem arises. Fourth, when obtaining a very low
mechanical Q at a low-range Langevin type machine @ half, a low density, thin object is used as
the metal material on the acoustic radiation side. In that case, non-uniform stress is caused to the
metal material by bolting. In addition, in the case of four gold materials, the vibrational radiation
is generated on the acoustic radiation surface at the time of shooting, and the power density of
the acoustic radiation surface becomes uneven at the time of transmission so that the cavity
phenomenon easily occurs. -Performance of theoretical solution is difficult to achieve because
the load of force water is not uniformly applied to the acoustic radiation surface. Fifth, when a
low density metal material and bolt 4 are joined, a creep phenomenon occurs in the metal
material and compression 1. For the electrostrictive element and the adhesive, problems of
compressive stress relaxation occur. The sixth has a weight of about 20 to 30 Kf and is broken
into a Langevin type impression element of this type, and a 6oo arrangement of 1. When it is
constructed as one set, etc., when assembling it, it is necessary for a large operator and a
tightening jig, and a great deal of labor is required in transportation and the like. とする。 There
are difficulties as listed in the first to sixth mentioned above, and the degree of the difficulty lies
in the fact that it has a low mechanical Q and allows high power transmission at a low frequency
(for example, 1 to 4 KHz). It can be said that it is remarkable in the case of vintage shooting @
sheep.
The present invention also provides a compression plate for compressing the turtle distortion
element and the adhesive itself, and compresses the vibration element by means of bolts etc. to
form a vibrating element bX, t, with additional mass at both ends thereof. The problem is to
provide a Langevin type imaging actuator which solves the problem by forming a certain metal
material 'i-4 @ -If +, and so on into one resonant unit, and which generates an extremely high
acoustic output with high efficiency at a low frequency. Hereinafter, the present invention will be
described in detail by the embodiments of the present invention. In Fig. 5 and Fig. 6, the
electrostrictive elements 11α and 11h having 'EndPage: 2 from a number or plural are made of
piezoelectric ceramic with silver electrodes baked at both ends, and when plural are used,
Adhesive or soft gold l! There are four plates 14C, and at both ends of the electrostrictive
elements 11α and 11b, there are # bonding agents or soft metal plates 14α and 14b, and
compression plates 19α. 19b are installed and by means of spring washers 16 and bolts 15-they
are compressed and configured as & moving elements. Compression board 1 qa, 19 b! The i'il E
strain element 11a, iL 6 and adhesive agent t are for applying compressive force uniformly to the
cross sections of the soft metal plates 14α and 14C 14C, and the material is any of metal,
synthetic resin, glass, and porcelain. It is. The metal material 12.13 is adhered or screwed to both
ends of the above-described vibration element by the adhesive 14d, 14g or by a screw or the like
to form a resonant unit. The above-mentioned K1, the Langevin-type vibrator of the present
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invention is configured. Since the metallic material 12.13 is an additional mass which can not be
lacking because of the configuration VCb of the Langevin type vibrator, it needs to be considered
acoustically, and in the case of this embodiment, it is cylindrical. However, the shape is not
particularly limited, and it may be conical or polygonal, and it is necessary to have a surface
which can be closely coupled to the compression plate 194. 19b. With the above structure,
power is supplied from the electrode leads a17a, 17b and 17c to be electro-mechanically
converted by the electrostrictive elements 11α and 11.6, and passes through the compression
plates 19α and 19b to be taken on the metal member 12. Motion is transmitted 5 and acoustic
radiation 18 is generated. Since the metal material 12 does not receive transmission of imaging
motion only by the cross-sectional area of the electrostrictive element as in the conventional
case, it receives transmission of imaging motion over the entire surface of the compression plate
19α, so that the acoustic radiation surface vibrates uniformly. Another embodiment of the
present invention is shown at 71'21. FIG. 7 is similar to FIGS. 5 and 6 in the first embodiment in
terms of structure and action (the number is the same because it is 7). In the first embodiment,
the electrostrictive elements 11.z and 11b and the adhesives 14a and 14!
The vibration element consisting of +, 14c and compression plates 19a, 19b is compressed 1, but
another embodiment) 47pJIrI'i! The strain elements 11a, 11 hh, and U are coated with soft metal
plates 14α, 14b, 14? The purpose is to apply a more uniform compressive stress than in the
first embodiment. To achieve the purpose by arranging a plurality of bolts. Another embodiment
of the rainbow of the present invention is shown in FIGS. 8 to 10, and in FIGS. 8 to 10, the
structure and operation are similar to those of FIGS. 5 and 6 of the first embodiment. The
numbers are the same as shown in Table 1, and new elements are represented by new (, new
numbers). In FIGS. 8 to 10, a large number of electrostrictive elements 11 are used as vibration
elements in order to obtain acoustically high driving force, and electric insulating plates 20α,
20b and compression plates 19α, 19b is installed, and is composed of a spring washer 16 and a
bolt 15. A compressive force is applied to the electrostrictive element 11 and the bonded portion
by tightening the bolt 15 '. The two ends of the imaging element are bonded or screwed with a
metal material 12.13 to form a resonance unit, which becomes a Langevin type imaging actuator
of the present invention. The metal material 12 has an area gold significantly larger than the
cross-sectional area of the electrostrictive element 11 to significantly lower the resonance
frequency and to prevent the cavity phenomenon, and the electrostrictive element 11 as a
driving source to lower the mechanical Q. Since it is necessary to reduce the isometric
positioning t in view of the thickness, the thickness with respect to the diameter is as thin as
possible (a material with a low density, and a low density. According to the above configuration,
the present Langevin-type vibrator is subjected to electro-mechanical conversion by the
electrostriction element 1), electric power is applied from the relay terminal 21a, the 2jbK
connection, and the electric and □ pole wire 17α, 17b. The vibration is transmitted to the metal
material 12 through the electrical insulating plate 20α and the compression plate 19α, and the
acoustic radiation 18 is generated. In this way, a Langevin type imaging actuator with low
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mechanical Q and high-efficiency, high-power transmission can be obtained at relatively low
ultrasonic frequencies (for example, 1 to sKflZ). FIGS. 11 to 16 show another embodiment of the
deformation of the electrostrictive element of the Langevin type vibrator and the adhesive or the
soft metal plate and the compression plate according to the present invention. In each case, the
electrostrictive elements 11a and 11b and the adhesive or the soft metal plate 14c and 14b. 14C
is the same as the configuration of the vibrating element shown in FIGS. 5 and 6 of the first
embodiment, but the compression method is different, and neither of them is used as a bolt. That
is, in FIGS. 11 and 12, the compression plates 19α and 19h possess a female screw and a male
screw having a diameter smaller than the inner diameter of the electrostrictive elements 11α
and 11b, and screw the mutual to each other to form an electrostrictive element 11α.
EndPage: 311.6 Th and compressive force are applied to the adhesives 14α, 14b and 14C. In
FIGS. 1'5 and 14, compression plates 19α and 19b have flanges 23α and 25b having a
diameter larger than the outer diameter of electrostrictive elements 11α and 11h, and a
relatively soft and elastic sealing ring 22tl-such as rubber. Attach and prevent mixing of fluid into
the electrostrictive elements 11α and 11b and the compression plate 19α. 19b The
transmission of mutual shooting movement is prevented. Fifteenth, 16th FIG. 1d compression
plates 1-9α, 19b are electrostrictive elements 11α. The electrostrictive elements 11α and 11h
and the adhesive 14α, 14b and 141? Add to the compression force. As described above,
according to the present invention, the electrostrictive elements 1α and 1b and the adhesive 4α
according to the large power transmission of the conventional Langevin type imaging element
shown in FIGS. For tensile failure of -4b and 4c, electrostrictive elements 11α and 11b and
adhesive or soft metal plates 14α, 14b and jAc and compression plates 19α and 19b as shown
in FIG. Port 15-i! Or a compression unit is applied by the compression plates 19α and 19b to
solve the problem, and a resonant unit is formed by bonding an indispensable metal material in
the configuration of the Langevin-type vibrator to both ends, and an extremely low frequency is
formed. Thus, it is possible to obtain a Langevin type vibrator having high efficiency, high power
transmission capability and low mechanical Q, and the following effects can be obtained against
the conventional problems. First, by providing the compression plates 19α and 19b on the
electrostrictive element 11 (Z, 11b and the adhesives 14cL, 14b, 14C1, the compression force is
added by the bolt 15 or the compression plates 19z, 1'il itself, and it is used as an imaging device
Confirm the performance, install metal material 12.13 on both ends of the image pickup element
(2 compression and then final confirmation should be done, there is not much element that the
performance varies by the adhesion of metal material 12.13, and the middle Final performance in
the process of This can minimize the generation of a large number of noses, and by bonding or
screwing to a metal material 1 of an appropriate shape and material depending on the
performance of the S @ element, variations in the final performance can be minimized. In
addition, it is possible to change the sympathetic frequency, directivity, and vibration mode. On
the other hand, another advantage of configuring the imaging element is that it is possible to
perform a high power excitation test by applying a compressive force to the electrostrictive
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element and to perform a large power and heavy metal as in the prior art. It is extremely
advantageous unlike the fact that the compressive force can not be applied if the material is not
attached.
Second, by using the compression plates 19α and 19h, the bolt 15 can be made extremely short
as compared with the conventional one, and it is not necessary to perform the same adhesion
and compression etc. including the conventional metal material 4- The compression jig is small,
the dimensional accuracy is improved, uniform compressive force can be applied to the
electrostrictive elements 11α and 11h and the adhesive or the soft metal plate 1jbZ, 14b and
14C, and the quality is improved compared with the conventional one. Do. Thirdly, since the head
of the bolt 150 is completely hidden by the metal material 13, water, moisture and the like do
not intrude into the inside of the electrostrictive elements 11a and 11h from the outside, and
electrical insulation failure occurs due to water, moisture, etc. . Further, as shown in the
embodiment of FIGS. 13 to 161, by providing a collar or the like on the outside of the
electrostrictive element, it is possible to further prevent water, moisture and the like out of the
electrostrictive elements 11α and 11b, and electrostriction. An inert gas or dry air or the like
useful for preventing electrical breakdown can be easily enclosed in the space 25 of very small
volume inside and outside the elements 11α and 11b. The fourth is metal 12. Low density and
thin thickness to lower mechanical Q. For this reason, in the conventional Langevin type vibrator,
the metal base material 2 is directly bolted, and the sound radiation surface of the metal material
2 is disturbed under the influence of the bolt. However, according to the present invention, the
compression plate 19α, Since the imaging motion transmission is made to the metal material 12
by the entire end face 19b, the imaging motion of the sound-emission surface becomes uniform,
and the output Si degree is uniform at the time of transmission, and the cavity phenomenon
occurs, vc, <<, the output The limit extends. In addition, the load of ice is uniformly applied to the
acoustic radiation surface, and the theoretical performance can be obtained. The fifth uses a low
density material for the metal material 2. In the prior art, creep is apt to occur in the screw
portion of the metal member 2 due to bolt bonding because of low mechanical strength, and
stress relaxation occurs in the electrostrictive elements 1α and 1b. There is no need to provide a
screw, and it is possible to use a material with high density and extremely high rigidity for the
compression plates 19α and 19b. EndPage: 4 and there is no problem of stress relaxation of the
electrostrictive elements 11a and 11b due to creep or the like. . Also related to this. The
processing of the metal material 12 ° 16 having a large weight (about 10 Kf) and a large shape
eliminates processing of a screw hole, a bolt through hole, etc., resulting in a difference. Since the
614 gold four members 12.13 can be bonded without breaking the final assembly jig, the
extremely large bonding and clamping jig as in the prior art (in the case of the present invention,
the clamping is in the state of the vibrating element It is necessary to have the effect of sieving,
which is not necessary in (1) large “labor's labor change” and equipment which can minimize
the handling in the condition where metal material 12.13 is not adhered is there.
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In particular, the effect of the present invention is excellent in extremely low [g per minute gL
number (eg λ-1 to 4 KHz '), excellent efficiency, high power transmission is possible, and
mechanical (low (L) Also in the case of a child い。
4. Brief description of the drawings. FIG. 1 is a longitudinal sectional view showing the basic form
of a conventional bolted Langeun type vibrator, FIG. 2 is a longitudinal sectional view showing
the bone form of FIG. 1, FIG. 11 is a cross-sectional view taken along the line of line 11 of the line
ΩA-A, and FIG. 4 is the same. 2. A cross sectional view taken along the line A-A of FIG. 2, FIG. 5 is
a longitudinal sectional view showing a basic form of the embodiment of the Langevin-type
vibrator of the present invention, and FIG. Fig. 7 is an exploded partial sectional view showing a
modification of Fig. 5 and Fig. 6, Fig. 8 is a longitudinal new view showing one embodiment of
the Langevin type vibrator of the present invention, Fig. 9 is Fig. 8 10 is a cross-sectional arrow
view taken along the line E-B VC of FIG. 8, and FIG. 11 is a part of the Langevin-type pendulum
according to the present invention 11 is a longitudinal cross-sectional view taken along the line
A--A of FIG. 11, and FIG. 16 is a longitudinal view showing a modification of FIG. 11, and FIG. 15
is a cross-sectional arrow view taken along the line A-A in FIG. 15, FIG. 15 is a longitudinal crosssection 1 line showing another modification in FIG. 11, and FIG. 16 is the line A-A in FIG. FIG.
Description of symbols 1 (LLJ), 11 (α, b): electrostrictive element 2.5.12. 13: metal material 4 (R,
b, C), 14 (αHb + '> I + adhesive or soft metal plate 5 .15: bolt 7 (a, b, c), 17 (rt, b, c): 1j-1t 119
(.alpha., B): compression plate 20 (.alpha., B): electrical insulation plate 22: encapsulation ring
agent Patent attorney thin 1) Toshiyuki second 2 + 3 figure + figure EndPage: 5 Figure 5: + 8
square o 9 each other + ohi 12 + 11 group 1 1z from the top 11: LI recording of class tl) Ming, m,
li '+ ( 2) [4 ° 而 1 piece (Of, IF, +1: 1; lI (4) 11+, 'l'lul ++++ book 11ifi other inventor, patent
applicant or representative inventor EndPage: 6
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