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JPS51113588

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DESCRIPTION JPS51113588
Two generations +1. ? 1 DIC,, ', Ql' patent-i-/ J application z 6 1450 March 3 millet 'l', 1. ? j-?
The name of the inventor's invention inventor и ? ░ ", W '* z ? ? (others) patent applicant
stock company? l: IIlo, иии, 1 '1 place I и J' Telephone No. Tokyo 270-2111 (Accession-5), \ Name
(7237) Patent attorney thin 1) Toshiyuki [Phase] Japan Patent Office ? JPA 51-113588 [phase]
release Japanese-style board 51. (1976) 10.6 Japanese Patent Application No. 50-87996 [Phase]
Application Japanese Patent Application No. 1a, (1975) 3.31 Request for examination not yet
filed (total 6 pages) Office internal reference number 6; g24-S ? 1 Title of the Invention
Langevin-type oscillator 1, Title of the invention Langevin-type oscillator
Langevin type vibrator
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of the Lange-Pan oscillator of an electroacoustic transducer. The object of the present invention
is the use of relatively low frequency ultrasonic waves, such as ultrasonic waves of 1 to 8 KHz,
for example, in water, and the noodle bowl of a lange-pan type transducer that generates highly
efficient and extremely high acoustic output. It compresses the piezoelectric electrostrictive
element itself by a clamp consisting of a compression plate and a bolt, etc. [7] The vibration
element is formed, and the metal material of the additional mass is bonded to both ends of the
element. It is a Langevin type vibrator formed in the resonance unit. Conventionally, when
obtaining a relatively low frequency ultrasonic wave (for example, 1 to 8 KIIZ), the Langevin-type
vibrator has a long overall length and an extremely large weight, and therefore, a metal material
that is an additional mass and an electrostrictive element that is a driving source. It is considered
useful to make the cross-sectional area ratio of 1-<(increase in cross-sectional area of the
electrostrictive element). However, although such a Langevin-type vibrator is satisfactory for
generating an acoustic output at a certain level, there is a problem due to the small cross-
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sectional area of the electrostrictive element in high-power transmission due to the high acoustic
density. . One of them is that the electrostrictive element itself is broken due to the generation of
high tensile stress during high power transmission. As is well known, the electrostrictive element
has a property that it is strong against compression unique to porcelain and weak against
tension. The other is that the bonding points between the electrostrictive element and the metal
material and the electrostrictive element are pulled apart due to the generation of high tensile
stress during high power transmission. From this, conventionally, a Langevin type vibrator in
which a bias EndPage: 1 stress is applied to the electrostrictive element and the bonding portion
in advance is provided. 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
Langevin type vibrator consisting of the electrostrictive element and the adhesive and the pair of
metal materials having additional mass can be used. The metal members are connected to each
other to apply a compressive force to the electrostrictive element and the adhesive. That is,
referring to FIGS. 1 to 4, according to one form of the conventional embodiment, the
electrostrictive elements 1? and 1b are adhered to each other by the adhesive 4c, and the
adhesive 4a is attached to both ends of the electrostrictive elements 1? and 1b. A metal material
2.6 having an additional mass is attached by abvc. The electrostrictive elements 1?, 1b and the
adhesive da, 1b, IC, L-metal are mechanically coupled by the spring washer 6 and the bolt 5 so
that they are not separated at high power transmission. Maintained and configured into an
integral Langevin-type transducer. Electric power is applied by the lead wires 7?, 7b and 7c,
electro-mechanical conversion is performed by the electrostrictive elements 1a and 1b, imaging
is transmitted to the metal material, and acoustic radiation 8 is generated. In the way, there are
the following difficulties.
First, in general, the performance is grasped only when the respective parts are assembled
together, and an intermediate step (for example, almost no electrostrictive element itself because
no compressive force is applied only by adhesion between the electrostrictive elements)
Performance. It is the least to predict the final performance in 1.). ?? In this case, defects in
parts such as breakage of the electrostrictive element, processing errors of metal materials,
adhesion during assembly, and errors in tightening are difficult to find unless they reach the end.
Unfortunately, all of the components fail if one of them is roughly hit and causes a performance
failure. In particular, when a large number of expensive electrostrictive elements are used to
exert high efficiency acoustically, the damage is remarkable including the labor required for the
metal material and the assembly. If you need a vibrator with different performance, it is
extremely troublesome. 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 and the bolt inevitably
becomes long, and the jig for bonding and compressing each part becomes extremely large, so
each dimensional accuracy becomes It becomes worse and stress concentration in the
compressed part can not be avoided. Sixth, in the case of bolting, the head of the bolt is exposed
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at the end of the metal material, so that water, moisture, etc. penetrates into the inside of the
electrostrictive element from between metal materials> bolt ?, causing problems such as
electrical insulation failure Will occur. In order to obtain a Langueban-type vibrator with
extremely low mechanical Q, as the metal material on the acoustic emission side is a low density
and thin object, bolting causes non-uniform stress on the metal material. When the metal
material causes vibrational disturbance on the acoustic radiation surface at the time of vibration,
the power density of the acoustic radiation surface becomes nonuniform at the time of
transmission, and a cavity phenomenon easily occurs. -Performance according to theory is
difficult to achieve because the load of force water is not uniformly applied to the acoustic
radiation surface. The fifth connects low density metal and bolt. In this case, a creep
phenomenon occurs in the metal material, and compression 1. The problem of compressive
stress relaxation occurs in electrostrictive elements and adhesives. The sixth one has a weight of
about 2 to 30 kg in this type of Langevin type vibrator, and in the case where it is configured as
one set by arranging 6 on pieces, a large bonding and fastening jig is required when assembling,
It requires a great deal of effort in transportation and the like. Above. In the case of a Langevintype vibrator, which has the problems described in the first to sixth items, in particular, the
degree of the problem is low in mechanical Q and capable of transmitting a large amount of
power at extremely low frequencies (for example, 1 to 4 KIrZ) It can be said that trLn is
remarkable.
The present invention relates to the above 1. Such a conventional defect is provided by using a
compression plate for compressing the electrostrictive element 2 and the adhesive itself,
compressing it with a bolt or the like to form a vibrating element, and bonding a metal material
which is an additional mass to both ends. The solution 12 is to provide a Langevin-type vibrator
that generates extremely high-efficiency sound output at high frequency and one resonance unit.
Hereinafter, the vc will be described in detail by the embodiments of the present invention. In
Fig.5 and Fig.6, when a plurality of electrostrictive elements 11? and 11b consisting of a
number or plural are made of a piezoelectric ceramic in which silver electrodes are baked at both
ends and EndPage: 2 mark is used, bonding is made between each of them And soft metal plates
14? and 14b are provided on both ends of the electrostrictive elements 11? and 11b, and
compression plates 19? and 19b are provided, and spring washers 16J and bolts 15 ? are
provided. Thus they are compressed and configured as S @ elements. The compression plates
19?, 19b are electrostrictive elements 11? 51b and an adhesive or a soft metal plate 14?, It is
intended to uniformly apply a compressive force to each cross section of ilb and 1IC. The
material is any of metal, synthetic resin, glass and porcelain. (7) Both ends of the vibrating
element are bonded with an adhesive 1act, 1ae or with a screw or the like by a metal member
12.13 force I or a screw 1t to form a resonant uni и soto. ??????? The present invention's
Langeno (N type vibrator is II! Will be Since the metal material 12.13 is a lumped mass which is
not lost in the construction of the Langeno (a ring type vibrator, it needs to be considered
acoustically, and in the case of this embodiment, it has a cylindrical shape. In particular, the
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shape is not limited to% IJ, and may be conical or polygonal, and the compression plates 19?
and 19hj need to have surfaces that can be closely coupled to each other. With the above
structure, power is supplied from the electrode lead wires 17?, 17h, 17C, electro-mechanical
conversion is performed in the electrostrictive elements 11?, 11b, and the vibration is
transmitted to the metal material 12 through the compression plates 19?, 19b. Be done. Since
the metal plate 12 does not receive transmission of imaging motion only by the electrostrictive
element 9 cross section as in the prior art, it receives transmission of vibration over the entire
surface of the compression plate 19a, so that the acoustic radiation surface performs uniform
imaging motion. . Another embodiment of the present invention is shown in FIG. FIG. 7 is the
same as FIG. 1 ? in FIGS. 5 and 6 of the fire embodiment in terms of structure and work. First
Embodiment 17 In the first embodiment, the image pickup element consisting of one of the
Poldove electrostrictive elements 11t, 11b, the adhesive 11a, 14J 14C, and the compression
plates 19a, 19b is compressed. 7 is intended to apply a compression stress more uniform than in
the first embodiment to the electrostrictive elements 11? and 11b and the adhesive or soft
metal plate 1?, 1Ab and 1Ac. We will arrange the bolts to achieve the purpose.
Still another embodiment of the present invention is shown in FIGS. Also in FIGS. 8 to 10, since
the structures and actions of the first embodiment are similar to each other, the numbers are the
same, and new elements are indicated by new numbers. In FIG. 8 to FIG. 10, the image pickup
element uses a large number of electrostrictive elements 11 in order to obtain an acoustically
high drive break, and electric insulators 20? and 20b and compression plates 19? and 19h are
provided at both ends thereof. A compressive force is applied to the electrostrictive element 11
and the bonded portion by tightening the one bolt 15 which is installed and constituted of a
spring washer 16 and a bolt 15. The two ends of the vibrating element are bonded or screwed
with a gold plating material 12.13 to form a resonant unit, thereby forming the Langevin type
vibrator of the present invention. The metal material 12 has an area significantly larger than the
cross-sectional area of the electrostrictive element 11 in order to lower the resonance frequency
significantly and prevent the cavity phenomenon, and in order to lower the mechanical Q, Since it
is necessary to reduce the equivalent substance 1-1, the thickness to the diameter is as thin as
possible 11 and is a low density material. With the above configuration, power is applied from
the electrode lead wire 1712.17b connected to the relay terminals 21a and 21h, and the
electrostrictive element 11TK- performs electro-mechanical conversion, and the electric
insulating plate The imaging motion is transmitted to the metal material 12 through the 2 + 1 (Z,
compression plate 19?, and the acoustic radiation 18 is generated. ??????? Thus, it is
possible to obtain a high-power transmission with high mechanical power and high efficiency at
a relatively low ultrasonic frequency (for example, 1 to 8 KIIZ), and to obtain a high-power
transmission. FIGS. 11 to 16 show another writing example of a vibrating element comprising an
electrostrictive element and an adhesive and a soft metal plate or a compression plate of a
Langevin-type vibrator according to the present invention. In any case, the electrostrictive
element 11?, 11 / l J-adhesive or the soft metal plate 14?, 14b. 14- is the same as the
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configuration of the vibrating element shown in 15 and 6 of the first embodiment, but the
compression method is different, and both use bolts. ????? That is, FIGS. 11 and 12 show
that the compression plates 19? and 19b have a female screw and a male screw having a
diameter smaller than the inner diameter of the electrostrictive elements 11? and 11b and
tighten the screws 5 with each other to form the electrostrictive element 11?. EndPage: 31 L 6 b
and adhesive 11 ct, 14 b, 14 c Ic compressed. In Figs. 15 and 14, the compression plates 19?
and 19b are electrostrictive elements 11a, and if the diameter of the dog is smaller than the
outer diameter of 1 lb, 23a, 2! + B is attached, and a relatively soft-elastic sealing ring 22 such as
rubber is attached to prevent mixing of fluid to the electrostrictive elements 11? and 11b, and a
compression plate 19?.
19h The transmission of the mutual vibration will be completely prevented. In FIGS. 15 and 16,
the compression plate 19? 619b is an electrostrictive element 11?. The entire screw portion
24 is larger than the outer diameter of 11b, and by tightening the screw portion 24, a
compressive force is applied to the electrostrictive elements 11? and 11h and the adhesive
14?, IAA and 1dc. As described above, according to the present invention, as shown in FIGS.
Electrostrictive elements 1?, 1b and adhesive 4? which are transmitted by high power
transmission of the conventional Langevin type vibrator. For tensile failure of Ah and At,
electrostrictive elements 11? and 11b of adhesive roller or soft metal plate 14a and 11bj 4c and
compression plate 19 / L shown in FIG. 5 and later of the embodiment of the present invention.
19b bolt 15 or compression plate 19?. Resolving compressive force by 19.6 itself 2 and forming
a resonant unit by connecting the gold metal material which is indispensable in the configuration
of the Langevin-type vibrator at both terminals, a very low same wave number is formed Thus, a
Langevin type vibrator having a high efficiency, high power transmission capability and low
mechanical Q can be obtained, which has the following effect with respect to the conventional
problems. The first is the electrostrictive element 11 (Z, 11! When compression plates 19? and
19b are provided, the compression force is added by the bolt 15 or the compression plates 19a
and 19h itself, and the performance as the vibrating element is confirmed. Install metal 12.13 at
both ends of the element. Compression 1. After final confirmation, the adhesion of the metal
material 12.13 does not have much effect on the performance, and the final performance can be
grasped in the middle step 1. In this case, it is possible to prevent the occurrence of many defects
in advance, and by bonding or screwing a metal material of an appropriate shape or material
depending on the performance of the vibration element, it is possible to minimize the variation of
the final performance. Both, it is possible to change the resonance same wave number, directivity,
and vibration mode. On the other hand, another advantage of constructing a vibrating element is
that a compressive force is applied to the electrostrictive element and a high power excitation
test is performed by the vibrating element alone ,! l: 'f): It is possible, and it is extremely
advantageous unlike the conventional case where a large and heavy metal material can not be
used to apply a compressive force. Second, by using the compression plates 19? and 19b, the
bolt 15 can be made extremely short as compared with the conventional one, and it is not
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necessary to perform adhesion, compression, etc. including conventional metal materials in the
same manner. The compression jig is small, the dimensional accuracy is improved, uniform
compressive force is applied to the electrostrictive elements 11? and 11b and the adhesive or
the soft metal plates 14?, 1ab and 1Ac, and the quality is improved compared to the
conventional one. .
Sixth, since the head of the bolt 15 is completely hidden by the metal material 13, water,
moisture, etc. do not penetrate into the inside of the electrostrictive elements 11?, 11b from the
outside, and electrical insulation failure is less likely to occur due to water, moisture, etc. . Also,
as shown in the embodiment of FIGS. 13 to 16, if a bulb or the like is provided on the outside of
the electrostrictive element, water, moisture and the like can be further prevented to the inside
and outside of the electrostrictive elements 11? and 11h. Distortion element 11?. 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 11b. Fourth, the metal material 12 is thin at
low density so as to lower mechanical Q. Therefore, in the conventional Langevin type vibrator,
the metal material 2 is directly bolted and the acoustic radiation surface of the metal material 2
is disturbed due to the influence of the bolt, but according to the present invention, the end faces
of the compression plates 19? and 19b Since the imaging motion transmission is made to the
metal material 12 by the whole, the imaging motion on the acoustic radiation plane becomes
uniform, and since the output density is uniform at the time of transmission, the cavity
phenomenon hardly occurs and the output limit is extended. Also, the load of water is uniformly
applied to the acoustic radiation surface, and it is all right to obtain theoretical performance.
Fifthly, when a low density material is used for the metal material 2, the mechanical strength is
low, so conventionally, creep occurs in the screw portion of the metal material 2 due to bolting
<stress on the electrostrictive element 1?, 1h Although the problem of relaxation occurred,
according to the present invention, the metal material 12 does not need to be provided with a
screw, and the compression plate 19 (Z, 19A can have a high EndPage: 4), and the electrostrictive
element 11a by creep or the like. There is no problem of stress relaxation of 11b. Further, in
connection with this, the weight is large (about 10 Kf), and the processing of the metal material
12.13 having a large shape is easy to save the processing of the screw hole, the 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 adhesive bond and the clamp jig as in the prior art (in the case
of the non-invention clamp is the shape of the vibrating element vlilf To be done. In addition to
the above, it is possible to minimize the handling when the metal material 12 ░ 15 is adhered,
and to save the labor and equipment. In particular, the effect of the present invention is
remarkable in the case of a Langevin type vibrator having a very low frequency (for example, 1
to a KHz) f and high efficiency and capable of high power transmission and a low fl & mechanical
Q.
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4. Brief description of the drawings. FIG. 1 is a longitudinal sectional view showing a basic form
of a conventional bolted Langevin type vibrator, FIG. 2 is a longitudinal sectional view 1 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 in FIG. 2, and FIG. 5 is a basic form of the
embodiment of the Langevin type vibrator of the present invention. The longitudinal crosssectional view shown, the sixth cause is a partial cross-sectional exploded view of 45, FIG. 7 is a
partial cross-sectional exploded view showing a modification of FIGS. 5 and 6, and FIG. 8 is one
implementation of the Langevin type vibrator of the present invention For example, a
longitudinal sectional view showing an example, FIG. 9 is a cross-sectional arrow view taken
along the line A-A in FIG. 8-a first old drawing is a transverse cross-sectional view taken along the
line B-B in FIG. Is a longitudinal cross-sectional view of the vibration element which is a
component of the Langevin-type imaging motor of the present invention, FIG. 12 is a crosssectional arrow view at AA @ in FIG. 6 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. 16, and FIG. 15 is
a longitudinal sectional view showing another modification of FIG. FIG. 16N is a cross-sectional
arrow view taken along the line AA of FIG. Symbols 1 '(c, b), 11 (cL, h); Electrostrictive element 2
+ 5 + 2' @ 13: Metals 4 (a, b, c), 1 rl (? J, C и): Adhesive or u soft gold s plate 5.15: bolt 7 (?, b,
C), 17 (?-b1 ?): lead yarn 919 (?, b): compression plate 20 (a, b ?): electricity Insulating plate
22: Encapsulation ring ? 10 ? 3 ? 4 Page EndPage: 5 years 5 ? 7 7 ? ? ? ol ol, ol 1 ol 11
11: list of classes 11) concave crest, 1 p (2) 74 faces one (: ++ 3! FIl, 1a (4) possess, '1 ga)
duplicate 11 pile Inventors other than the above, patent applicant or representative inventor
EndPage: ?
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