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JPS51113589

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DESCRIPTION JPS51113589
... (60 3 years 3F !! l · 庁 [Name of inventor invention inventor (1 °); Ii Kanagawa Prefecture ti
cans mountain 7 div-high), 6 Hitachi, Ltd. p tsuka factory 1 (Masumi Suzuki special feature, i'r ?
IIイ2、 ”°″。 Name-(7237) Patent Attorney's Patent 1f, 1 ',': 1- 1 '■ Japanese Patent
Office Open Patent Gazette ■ Japanese Patent Application No. 5i-113589 公開 Japanese Patent
Application No. 51. (1976) 10.6 Office internal reference number 6g2 doo doo specification 1,
name of invention Langevin type vibrator 1, name of invention Langevin type vibrator
Langevin type vibrator
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a Langevin type transducer of an electroacoustic reputable garment. 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 KHz, and high efficiency
and extremely high acoustic output. It compresses the piezoelectric electrostrictive element itself
by the tightening plate and bolt etc. and takes a picture. It is a Langevin type imaging moving
member which is formed in a resonance unit by forming an element and bonding a metal
material which is an additional mass to both terminals thereof. Conventionally, when obtaining a
relatively low frequency ultrasonic wave (for example, 1 to s KHz), a Langevin-type imaging
actuator has a long overall length and an enormous weight, and therefore, an electrostrictive
element as a driving source and gold as an additional mass It is considered useful to make the
cross-sectional area ratio of the example of the draft material extremely large (the cross-sectional
area of the electrostrictive element and the cross-sectional area of the metal base material). (2
Although such a Langevin-type vibrator is satisfied to generate an acoustic output up to a certain
degree, the high acoustic density causes a small cross-sectional area of the electrostrictive
element for high-outgoing transmission. There's a problem. One of the problems is that the
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electrostrictive element itself is broken due to generation of high tensile stress during high power
transmission. As is well known, the electrostrictive element is strong in the characteristic of
porcelain and strong in tension and weak. The other one is that the user's location between the
electrostrictive element and the metal material and the electrostrictive element is pulled apart
due to the generation of tensile stress during high power transmission. From this, conventionally,
a Lange-Pan-type vibrator having even-odd stress applied to the electrostrictive element and the
bonding portion is provided in advance from EndPage: 1. In order to maintain the mechanical
connection between the electrostrictive element and the metal material by means of an elastic
device such as a bolt, the lange-pan type vibrator consisting of the electrostrictive element and
the adhesive and a pair of metal materials as additional mass is used. It is a structure which
connects metal materials and adds compressive force to the electrostrictive element and the
adhesive. That is, to explain one form of the conventional embodiment in FIG. 1 to FIG. 4B, the
electrostrictive element and the elements 1α and 1b are adhered to each other by the adhesive
4c, and both ends thereof are adhered by the adhesive 4α and 4b. The metal material 2.6 which
is 0 method child is attached. With their electrostrictive elements 1a and 1b and adhesives 4α
and 4, 4ry and metal material maintain their mechanical connection by spring washers 6 and
bolts 5 so that they are not pulled apart during high-power transmission. 1. Is configured as an
integral Langevin-type vibrator. In the operation, electric power is applied by the lead wires 7α,
7b, 7CTIC, electro-mechanical conversion is performed by the electrostrictive elements 1-L, 1h,
vibration is transmitted to the metal material, and acoustic radiation 8 is obtained.
Above. In the prior art method, there is the following throat point. The 11d parts are generally
assembled only in one piece, and it is generally understood that the performance is grasped only
for intermediate work types (for example, the adhesion between the failure and failure elements
alone is not applied with a compressive force). It is the performance of itself. Predict the final
performance in), け λ λ. In this case, failure of each part, for example, damage to the
electrostrictive element, processing error of metal material or assembly ['Th adhesion, tightening
error, etc. can not be finally reached, I can be found (Ro unfortunately In the case where one of
them generally suffers from poor performance, all components become defective. In particular,
when a large number of 1-fold electrostrictive elements are used 1-7 in order to exert a high
efficiency in a sheen-like manner, the metal parts and the assembly 1 are assembled. The
damage, including labor, was written by 1. い。 It is extremely troublesome when it is necessary
to perform various performance tests. The second point is that it is difficult to apply uniform
compressive force to the electrostrictive element and the adhesive. In order to obtain a low
frequency rang-pan type vibrator, the metal material is large, and the bolt is inevitably long, and
the jig for bonding and compressing each part is also extremely large. In addition, the
dimensional accuracy of each is deteriorated, and stress concentration in the compressed portion
can not be avoided. Third, in the case of bolting, the head of the bolt is exposed at the end of the
metal material, so water or moisture etc. penetrates into the inside of the electrostrictive element
from between the metal material and the bolt, and the electric collar defect is A problem arises.
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Fourth, when obtaining a very low mechanical Q Langevin-type imaging motor, the low-density,
thin-walled metal material is used for the acoustic radiation side, but in this case the bolting is
uneven due to the caulking material. When stress is applied, the metallic material causes
vibrational disturbance on the sound emission surface during shooting, the power density of the
sound emission surface becomes nonuniform during transmission, and cavity phenomenon tends
to occur. -Performance according to theory 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 a bolt are combined, a creep phenomenon occurs in the metal material, and a pair of
compressed electrostrictive element and adhesive is used. It causes problems of compressive
stress relaxation. The sixth is about 20 to 30-weights of this kind of Langevin type video camera,
or when 10 sets are arranged as one set, etc., when assembling, a large siding officer Also, it
requires a fastening jig and requires a great deal of labor in transportation and the like. There are
the problems as mentioned in the first to sixth mentioned above, especially the degree of the
saddle point is low in mechanical Q, and Langeban pear type with high ovability transmitting
high power at extremely low frequency (eg 1 to aKHz) It can be seen that in the case of the
mover it is significant.
The present invention is provided with a compression plate for compressing the electrostrictive
element and the adhesive itself as described above in the prior art, and is compressed with a bolt
or the like to form an imaging element as a whole, and metal which has an additional mass at
both ends The problem is to provide a Langevin-type vibrator that solves the problem by bonding
the materials into one resonant unit and generates a very high efficiency of acoustic output at
low frequencies. An electrostrictive element 11α or 11b consisting of a number or a plurality of
elements will be described in detail with reference to the embodiments of the present invention
hereinafter. The electrostrictive elements 11α and 11b are made of piezoelectric ceramic having
silver electrodes EndPage: 2 baked at both ends. When two or more are used, there is an
adhesive or soft metal plate 14C between them, and there are also adhesives or soft metal plates
14α and 14b at both ends of the electrostrictive elements 11α and 11b, and a compression
plate 19α. 19b are installed, they are compressed by the spring washer 16 and the bolt 15, and
Is configured. The compression plates 19α, 19b are electrostrictive elements 11α, 11b% and an
adhesive or a soft metal plate 14a, 1716 ° 14? The material is a metal, synthetic resin, glass, or
any one of an @ instrument. The metal members 12 and 13 are adhered or screwed to both ends
of the above-described imaging element by the adhesive 14 d or 14 e or by a screw or the like to
form a resonant unit. Thus, the Langevin-type imaging actuator of the present invention is
configured. The gold tank material 12.15 is an additive substance which is indispensable for the
configuration of the Langevin type vibrator, and needs to be considered acoustically, and in the
case of the present embodiment, it has a cylindrical shape. The shape is limited and may be
conical, polygonal or polygonal, and it is necessary to have a surface which can be closely
coupled to the compression plates 19a and 19b. With the above structure, electric power is
supplied from the electrode lead wires 17α, 17b and 17c, applied to the electric and strain
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elements 11α and 11b, electro-mechanically converted, and transmitted to the metal member
12 through the compression plates 19α and 19h. And acoustic radiation 18. Since the metallic
material 12 receives the transmission of the imaging motion over the entire surface of the
compression plate 19α, instead of receiving the imaging motion only by the cross section of the
electrostrictive element as in the conventional case, the acoustic radiation surface is uniform.
Take a swing. Another embodiment of the present invention is shown in FIG. Since the 71st
threshold is similar to that of the first embodiment in FIG. In the first embodiment, a single bolt is
used to compress the vibration element consisting of the electrostrictive element 11α + 11h, the
adhesives 14a, 14b and 14C, and the compression plate 19α @ 19b, as shown in FIG. 7 of
another embodiment. The purpose is to apply a compressive stress that is more uniform than the
first embodiment to the electrostrictive elements 11α and 11h and the adhesive or soft metal
plates 14a, 14b and 14C, and a plurality of bolts are used. It distributes and achieves the
purpose.
Another embodiment of the rainbow of the present invention is shown in FIGS. Eighth to 101st!
21 are similar to those in FIGS. 5 and 6 of the first embodiment in terms of structure and action,
so the numbers are the same, and new elements are represented by new numbers in Table 1. た
。 In the eighth to 101'2] ic elements, a large number of electrostrictive elements 11 are used to
obtain a high driving force acoustically, and electrical insulating plates 20σ, 2. The Ob and the
compression plates 19α and 19b are installed, and a compression force is applied to the
electrode element 11 and the bonding portion by tightening the bolt 15, which is constituted by
the spring washer 16 and the bolt 15. The two ends of the image pickup element are screwed
with a metal material 12.13 by a metal member to form a resonance unit, thereby forming a
Langevin type image pickup element of the present invention. The metal material 12 has an
extremely large area in accordance with the cross-sectional area of the electrostrictive element
11 in order to lower the resonance frequency significantly and prevent a cavity phenomenon,
and an electric element which is a driving source to lower mechanical Q. Because it is necessary
to reduce the equivalent bond quality from the viewpoint of 11, it is a material with a thickness
to a diameter as thin as possible <12, and a low density. With the above configuration, the
present Lange-Pan type vibrator is connected to the relay terminals 21a and 21b, and electric
power is applied from the electrode lead wires 17α and 17b, and is electro-mechanically
converted by the electrode element 11, and the electric insulating plate 20α and the
compression plate The i motion is transmitted to the metal material 12 through 19α and
becomes acoustic radiation 18. In this manner, a Langevin-type vibrator having a low mechanical
Q and relatively high efficiency and capable of transmitting a high power can be obtained at a
relatively low ultrasonic frequency (1 to sKHz as a rule). FIGS. 11 to 16 show an embodiment of
another modification of the electrode element of the Langevin type imaging device of the present
invention and the vibrating element composed of an adhesive or a soft metal plate and a
compression plate. Each of them is an electrode element 11α. 11b and the adhesive or soft
metal plate 14α, 14b, 14C are the same as the configuration of the vibration element shown in
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FIGS. 5 and 6 of the first embodiment, but the compression method is different and none of them
is used as a bolt . That is, in FIGS. 11 and 12, the compression plate 19 (Z, 19b has a female
screw and a male screw having a diameter smaller than the inner diameter of the electrostrictive
device 11α, 11b, and the electrostrictive device 11α, 11b and EndPage: 3 for applying a
compressive force to the adhesive 14α, 14b, 14C. In FIGS. 16 and 14, the compression plates
19α and 19b have a diameter 23α that is larger than the outer diameter of the electrostrictive
elements 11α and 11b. Containing a relatively soft and elastic sealing ring 22 の such as rubber
etc., preventing mixing of fluid into the electrostrictive elements 11 · t and 11b, and preventing
transmission of mutual vibration of the compression plates 19J 19b In Fig. 15 and Fig. 16, the
compression plates 19a and 19b are electrostrictive elements 11a and 111!
It has a screw portion 24 larger than the outer diameter of l, and tightening the screw portion 24
applies a compressive force to the contact elements Iz 14a, 14b, 14c Vc. As described above,
according to the present invention, the electrostrictive elements 1tt and 1b and the adhesive 4
(Z.) by high power transmission of the conventional Langevin-type @ insulator shown in FIGS.
The tensile strain of 4b and 4c is compared with that of the electrostrictive element 11a, 11bb
and adhesive as shown in FIG. 5 and later of the non-inventive embodiment and the soft metal
plate 14a, 146, 14C and the compression plate 19α. , 19b by applying a compressive force by
the bolt 15 or the compression plate 197Z, 19b itself [,-solution terminal by bonding a metal
material which is indispensable in the configuration of the Langevin type vibrator to both ends of
the seven] A Langeban-type vibrator which is formed, has high efficiency at extremely low
frequency, can transmit high power, and has low mechanical Q can be obtained, and has the
following effect with respect to the conventional problems. First, by providing the compression
plates 19α, 19b with the electrostrictive elements 11α, 11b and the adhesives 14LL, 14D, 14C,
the compression plate 19cL, 19b itself applies compressive force to the bolts 15 and confirms
the performance as a vibrating element Then, place metal material 12.15 at both ends of its
vibration element and compress it; after finishing, make sure that the final g is thin td, the
element whose performance is uneven due to the adhesion of metal material 12.13 does not have
any difference, and it is in the middle The final performance can be grasped by the process Kb.
This means that the occurrence of many defects can be prevented in advance, and variations in
final performance can be minimized by bonding or screwing a metal material of an appropriate
shape or material depending on the performance of the tll element. In addition, it is possible to
change the resonance frequency, inter-finger nature and vibration mode. 10,000, another
advantage of constructing the vibration element is that the compressive force is applied to the
electrostrictive element-the excitation test with high power can be performed by the vibrating
element itself, and it is large and heavy as in the prior art Unlike the fact that it is impossible to
apply a compressive force unless a certain metal material is used, it is extremely advantageous.
Second, by using the compression plates 19α and 19b, the bolt 15 can be made extremely short
as compared with the conventional one, and if adhesion, compression and the like including the
conventional metal material are performed at the same time (it is not necessary to Bonding,
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compression jig is small, dimensional accuracy is improved, s, electrostrictive element 11α, 11h
and adhesive or soft metal plate 14α, 14I), 14cK uniform compressive force can be applied, the
quality is better than the conventional one Same as above.
Third, since the head of the bolt 15 is completely hidden by the metal member 16, water,
moisture, etc. do not intrude into the inside of the electrostrictive elements 11α, 11b from the
outside, and electrical insulation failure is unlikely to occur due to water, moisture, etc. . Also, as
shown in the embodiment of FIGS. 13 to 16, if a collar or the like is provided on the outside of
the electrostrictive element, the electrostrictive element 11 (Z, 11 / l,. While being able to
prevent, it is possible to easily enclose an inert gas or dry air or the like that is useful for
preventing electrical breakdown of the space 25 of very small capacity inside and outside of the
electrostrictive elements 11α and 11b. The fourth is a low @ degree and a thin thickness in
order to lower the mechanical Q of the metal material 12I'i. According to the present invention,
although the roundness of the conventional lange pan type steel plate is that the metal material 2
is directly bolted and the acoustic radiation surface of the metal material 2 is disturbed under the
influence of the bolt, according to the present invention, the compression plate 19α , 19b, the
entire surface is transferred to the metal member 12 by the entire end face 19b, so the vibration
#J of the acoustic radiation surface becomes uniform, and the output density is uniform at the
time of transmission, so that the hollow phenomenon occurs << << of the output The limit
extends. The load of the literary person will be uniformly attached to the acoustic radiation
surface, and the theoretical performance can be obtained. The fifth uses a low @ degree material
for the metal material 2-1. In the prior art, creep was apt to occur in the screw portion of the
metal member 2 due to low mechanical strength because of the low mechanical strength, and a
problem of stress relaxation occurred in the electrostrictive elements 1α and 1b. The material
12 does not need to be provided with a screw, and it is possible to use a material having a high
density and a high rigidity and a high compression plate 19α, 19bK, and an electrostrictive
element 11α due to creep or the like. The problem of stress relaxation of 11b is not. Further, in
connection with this, EndPage: 4 has a large weight and a large (about IQ kg) shape of metal
material 12.13 can be easily processed to save a screw hole, a bolt through hole and the like.
Sixth, since the metal material 12.13 can be bonded without using 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 performed in the state of the vibrating element Not only does not need to be
treated, but also it can minimize the handling when the metal material 12.13 is bonded, requiring
a great deal of labor and equipment. There is no such effect. In particular, the effect of the
present invention is remarkable in the case of a low Q (Large-Pan) type vibrator which has high
efficiency at very low frequencies (e.g. 1 to 4 KEIZ) and enables Okawa transmission and low
mechanical Q.
4. Brief description of the drawings FIG. 1 is a longitudinal sectional view showing a basic form of
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a conventional bolted Langevin type vibrator, FIG. 2 is a longitudinal sectional view showing a
modification of FIG. 1, and FIG. 2 is a cross sectional view taken along the line A-A, FIG. 4 is a
cross sectional view taken along the line A-A shown in FIG. 2, and FIG. 5 is an embodiment of the
Langevin-type vibrator of the present invention. FIG. 6 is a partial cross-sectional exploded view
of FIG. 5; FIG. 7 is a partial cross-sectional exploded view showing a modification of FIGS. 5 and
6; FIG. Fig. 9 is a cross-sectional view taken along the line A-A in Fig. 8 and Fig. 9 is a crosssectional view taken along the line B-B in Fig. 8. FIG. 11 is a longitudinal cross-sectional view of a
vibrating element of a limp that is a part of the Langevin-type vibrator of the present invention,
and FIG. 12 is a cross-sectional arrow view taken along line A-A of FIG. Fig. 15 is a longitudinal
sectional view showing a modification of Fig. 11, Fig. 14 is a cross-sectional arrow view taken
along the line A-A of Fig. 15, and Fig. 15 is a longitudinal view showing another modification of
Fig. 11. FIG. 16 is a cross-sectional view taken along the line A-A in FIG. Description of symbols 1
(a, h), 11 (cz, b): electrostrictive element-2, 3, 12, 13: metal material 4 (α, D, C), 14 (α, b, c):
adhesion Agent or soft metal material S, 1S: bolt 7 (α, b, C), 17 (α, b, c): linear line 19 (α, b):
compression plate 20 (a, b): electric Insulating plate 22: Containing ring agent patent attorney
thin 1) interest, r @ age 31! "F + Fig 2 Di + Ls + ^ 1 ^ 1 difference /" · · EndPage: 51 Figure 7
concave + 8 concave 肇 115! I'ft 2 figure attachment, 11 11 records (l) ale 31 [2] drawing 1
(shun Eg 4 I 1 (1) line word application copy 1 1 other inventor, patent applicant or Agent
Inventor Name zj'44iiif'EndPage: 6
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