JPS51113587

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DESCRIPTION JPS51113587
Patent-· · Application 25: "alt 5 ° 6, 3 □ 37, 1 year old, '· Office V-official (j (title of the
invention-λ inventor l (-Suzuki Masamaru (one person) patent) Applicants 1 · · · Tokyo 1st
generation [11 wards Marunouchi-Ding 115 Tf] 5 株 式 shares: company 111 ・ · ''! T place 1! .
[Phase] Japan Patent Office 0 JP-A 5 L-113 587 獅 published Japan. (1976) 10.6. 昭 50-37995
Internal Code No. 6g: Z4-54 Specification 1, Name of Invention Jinspan-Type Vibrator 1, Name of
Invention Jinspan-Type Vibrator
Langevin type vibrator
3. Detailed Description of the Invention The present invention relates to the improvement of a
zinc-spun type vibrator of an electroacoustic transducer. The object of the present invention is to
provide a relatively low frequency ultrasonic wave for use in water, eg a 1 to 8 KEz ultrasonic
wave, and a Jinschupang type vibrator which generates a high efficiency and extremely high
acoustic output. It compresses the piezoelectric electrostrictive element itself based on the
tightening material consisting of a compression plate and a bolt etc. to form a vibrating element,
bonds the metal material which is the additional mass to the both ends, and resonates the unit It
is a Jinshopan type vibrator formed on Conventionally, when obtaining a relatively low frequency
ultrasonic wave (e.g. 1 to 5 KHz), the zincpane type transducer has a long overall length and an
enormous weight, so the sectional area ratio of the electrostrictive element as the driving source
and the metal material as the additional mass It is said that it is useful to make the size of the
cross section of the electrostrictive element extremely large. However, such a Langevin-type
vibrator is satisfactory for generating an acoustic output up to a certain degree, but has a
problem because the cross-sectional area of the electrostrictive element is small 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 at the time of high power
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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 one is that the
bonding points between the electrostrictive element and the metal material and the
electrostrictive element are separated due to the occurrence of high tensile stress EndPage: 1
during high power transmission. From the above, there has conventionally been provided a
Langevin-type vibrator in which an electrostrictive element and a bonding portion have been
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 bolt, a lange pan type
vibrator comprising an electrostrictive element and an adhesive and a pair of metal materials as
additional mass is used. The metal members of the above are connected to apply a compressive
force to the electrostrictive element and the adhesive. That is, in FIG. 1 to FIG. 4, one type of the
conventional embodiment will be described. The electrostrictive elements 1a, 1h- are adhered to
each other by the adhesive 4C, and both ends thereof are adhesive 4a, 4h. Is an additional mass
of metal material (bonded). Those electrostrictive elements 1α. 1b and adhesive 4a, 4b, 4e and
metal material maintain their mechanical connection by spring washer 6 and bolt 5 so that they
do not separate each other during high-power transmission, thereby forming an integral
Langevin type vibration Configured to be a child. Electric power is applied by the lead wires 7a,
7h, 7c, electro-mechanical conversion is performed by the electrostrictive elements 1a, 1h,
vibration is transmitted to the metal material, and acoustic radiation 8 is generated.
The prior art methods as described above have the following disadvantages. First, in general, the
performance can be grasped only after the respective parts are assembled together, and an
intermediate process (for example, only adhesion of the electrostrictive elements to each other is
applied with a compressive force, and thus almost the electrostrictive elements themselves)
Performance. It is difficult to predict the final performance in In this case, defects in each part,
for example, damage to the electrostrictive element, processing errors of metal materials,
adhesion during assembly, tightening errors, etc. are difficult to detect unless they reach the end.
Unfortunately, one of them is * performance, If a defect occurs, all components become defective.
Particularly when using a large number of expensive electrostrictive elements in order to exert
high efficiency acoustically, the damage, including the labor required for metal material and
assembly, is remarkable, requiring a vibrator of various performances. If you It is extremely
troublesome. The second point is that it is difficult to apply uniform compressive force to the
electrostrictive element and the adhesive. Especially when obtaining a low frequency Langevin
type vibrator, the metal material becomes extremely large. Inevitably, the bolt becomes long and
the jig for bonding and compressing each part becomes extremely large, so that the dimensional
accuracy of each becomes worse and the stress concentration in the compression part can not be
avoided, and the third is bolting In this case, since the head of the bolt is exposed at the end of
the metal material, water, moisture and the like intrude into the inside of the electrostrictive
element from between the metal material and the bolt, causing problems such as electrical
insulation failure. Fourth, when obtaining a very low mechanical Q Langevin type vibrator, the
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metal material on the acoustic radiation side is a low density and thin object, but in that case
non-uniform stress is applied to the metal material by bolting. When a metal material vibrates,
vibrational disturbance occurs on the sound emission surface, and when transmitting, the power
density of the sound emission surface is nonuniform, and potash and cavity phenomenon easily
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, the metal material creeps and causes a problem of compressive stress
relaxation to the compressed electrostrictive element and adhesive. The sixth is the weight of this
type of Lanjno (about 20 to 30 or more in a ring type vibrator, and when it is arranged in 300
pieces and configured as one sect, etc., a large bonding and fastening jig is required. And, it takes
a lot of labor in transportation etc. The Langeban-type vibrator has the disadvantages described
in the first to sixth mentioned above, and in particular, the degree of the difficulty is low in
mechanical Q and capable of high-power transmission at an extremely low frequency (for
example, 1 to 4K11z). It can be said that the case is remarkable.
According to the present invention, a conventional compression plate as described above is
provided with a compression plate for compressing the electrostrictive element and the adhesive
itself, compressed with a bolt or the like to form a vibrating element, and metal materials of
additional mass at both ends thereof. It is an object of the present invention to provide a
Langevin type vibrator which solves by bonding into one resonance unit and generates a very
high efficiency and high sound output at a low frequency. EndPage: 2 which will be described in
detail by the embodiments of the present invention. One fifth. In FIG. 6, one or more 7T: 1
electrostrictive elements 11a and 11h are made of a piezoelectric ceramic made of a silver
electrode at both ends, and a plurality of fields and gauges are used. There is an adhesive or soft
metal plate 14C, and there are also adhesives or g metal plates 1aa and 1ah at both ends of the
electrostrictive elements 11a and 11A, compression plates 19a and 19h are provided, and the
spring washer 16 and bolt 15 They are compressed and configured as a vibrating element. The
compression plates 1qa and 1qb are for applying compressive force uniformly to the cross
sections of the electrostrictive elements 11α and 11b and the adhesive or soft metal plates
14α, 14h and i4C, and the material is metal 1 synthetic resin, glass or porcelain It is either. The
metal members i2 and 13 are bonded or screwed to both ends of the above-described vibrating
element by the adhesive 14d or 14g or by a screw or the like to form a resonant unit. Thus, the
Langevin-type vibrator of the present invention is configured. Since the metal material 12.13 is
an additional mass which can not be lacking in the configuration of the Langevin-type vibrator, it
needs to be considered acoustically, and in the case of this embodiment, it has a wedge-like
shape, but the shape is particularly limited. It is not necessary, and it may be conical or
polygonal, and it is necessary to have a surface which can be closely coupled to the compression
plates 19σ, 19h. According to the above structure, power is supplied from the electrode lead
wires 17a, 17b, ', 7c and electro-mechanically converted in the electrostrictive elements 11a,
11b, and the compression plates 19α, 1? Through b, the vibration is transmitted to the metal
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material 12 and acoustic radiation 18 is generated. Since the metal material +2 does not receive
the transmission of vibration only by the cross-sectional area of the electrostrictive element as in
the prior art, it receives the transmission of vibration over the entire surface 1 of the
compression plate 19a, so the acoustic radiation surface vibrates uniformly. Another embodiment
of the present invention is shown in FIG. FIG. 7 shows the fifth embodiment of the first
embodiment. Since the structure and function are similar to those of FIG. 6, the numbers are the
same and the numbers are the same. In the first embodiment, a single bolt electrostrictive
element 11α 11h, adhesive 14a, 14b, 14C, compression plate 19cL, Although the vibration
element consisting of 19 h was compressed, FIG. 7 of another embodiment shows compression to
the electrostrictive elements 11α and 11b and the adhesive or soft metal plates 14α, 14A and
14C more uniformly than the first embodiment. The purpose is to apply stress, and a plurality of
bolts are arranged to achieve the purpose.
Still another embodiment of the present invention is shown in FIGS. The structures and functions
of FIGS. 8 to 10 are similar to those of FIG. 5 of the first embodiment, so the numbers are the
same and the new elements are indicated by new numbers. In FIG. 8 to FIG. 10, the vibrating
element uses a large number of electrostrictive elements 11 in order to obtain an acoustically
high driving force, and electric insulating plates 20α and 20h and compression plates 19a and
19A are provided at both ends thereof. It is installed, is composed of a spring washer 16 and a
bolt 15, and by tightening the bolt 15, a compressive force is applied to the electrostrictive
element 11 and the bonding portion. A resonant unit is formed by bonding or screwing a metal
material 12.13 to both ends of the vibrating element, and the Langevin type vibrator of the
present invention is obtained. In order to significantly lower the resonance frequency in the
metal material and to prevent the cavity phenomenon, the electrostrictive element 11 which is a
drive source and has a significantly larger area than the cross-sectional area of the first strain
element 11 and lowers one mechanical Q. Since it is necessary to reduce the equivalent mass as
viewed from the viewpoint, the thickness with respect to the straight path is made as thin as
possible, and the present Langevin type vibrator is an electrode lead connected to the relay
terminals 21α and 21b by the configuration of 6 or more which is a low density material. The
electric power is applied from the lines 17α and 17h, and electro-mechanical conversion is
performed by the electrostrictive element 11, the vibration is transmitted to the metal material
12 through the electric insulating plate 20 (Z compression plate 19g, and the acoustic radiation
18 is generated. In this manner, a Langevin-type vibrator having a low mechanical Q and
relatively high efficiency and capable of transmitting a high power at relatively low ultrasonic
frequency (for example, 1 to 8 KHz) can be obtained. FIGS. 11 to 16 show an embodiment of
another modification of the vibrator element consisting of the electrostrictive element and the
adhesive and the soft metal plate or the compression plate of the Langevin-type vibrator of the
present invention. In any case, the electrostrictive elements 11α and 11h and the adhesive or
soft metal plate 14α + 14A114c are the fifth embodiment of the first embodiment. The
configuration of the vibrating element shown in FIG. 6 is the same as that of EndPage: 3, but the
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compression method is different and no bolt is used. That is, the eleventh. FIG. 12 shows that the
compression plate 19α 19b has a smaller thread and screw than the inside of the electrostrictive
elements 11α and 11h, and the electrostrictive elements 11α and 11h and the adhesive 14α
by screwing each other. It applies compressive force to i4bsi4c. In FIG. 15 °, compression i 19
α, 19 b have flanges 23 α, 25 h having diameters larger than the outer diameters of
electrostrictive elements 11 α, 11 h, and mount the elastic soft sealing ring 22 such as rubber.
This prevents the fluid from being mixed into the electrostrictive elements 11α and 11b, and
also prevents the transmission of vibration between the compression plates 19α and 19h.
Fifteenth. In FIG. 16, is the screw portion in which the compression plates 19α and 19b are
larger than the outer diameter of the electrostrictive elements 11a and 11b? 4 and applies a
compressive force to the electrostrictive elements 11α and 11b and the adhesives 14α, 14b
and 14C by tightening the screw portion 24. As described above, according to the present
invention, the first one. 2. Electrostrictive elements 1α and 1b and adhesive 4α by high power
transmission of the conventional Langevin type vibrator shown in FIG. For tensile failure of 4h,
4c, electrostrictive elements 11α, 11h and adhesive or soft metal plates 14α, 14h, 14c and
compression plates 19α, 19h shown in FIG. Bolt 15 or compression plate 19α. Solve by
applying compression force by 19h itself. A resonant unit is formed by bonding an indispensable
metal material to both ends of the configuration in the configuration of the Lean-Span type, and
it has high efficiency at extremely low frequencies, can transmit high power, and is mechanically
A low-range Langevin oscillator is obtained. There are the following effects to the conventional
difficulties. The first is an electrostrictive element 11α, 11b, and an adhesive 1 + 4a, 14b, i4 +?
By providing compression plates 19α and 19h, compressive force is applied by the bolt 15 or
the compression plates 19α and 19b itself, the performance as a vibration element is confirmed,
and metal materials 12.13 are installed and compressed at both ends of the vibration element He
should do the final confirmation, there is not much factor that the performance varies by the
adhesion of the metal material 12.13, and the final performance can be grasped in the middle
process. This can minimize the occurrence of many defects, and by bonding or screwing a metal
material of an appropriate shape according to the performance of the vibrating element, it is
possible to minimize the variation of the final egg. It is possible to "change resonance frequency,
directivity, vibration mode". On the other hand, another advantage of configuring the vibrating
element is that a compressive force can be applied to the electrostrictive element, and a high
power excitation test can be performed by the vibrating element alone, and a large and heavy
metal material as in the prior art can be used. It is extremely advantageous that compression
force can not be applied if it is not attached. Second, by using the compression plates 19α and
19b, the bolt 15 can be made extremely short as compared with the conventional one, and it is
not necessary to perform adhesion and compression including conventional metal materials at
the same time. The jig is small, the dimensional accuracy is improved, and the electrostrictive
element 11α. 11 h and adhesive or soft metal plates 14 α, 14 b. 14? Uniform compressive
force can be applied, and the quality is improved compared to the conventional one.
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Third, since the head of the bolt 15 is completely hidden by the metal material 13, the
electrostrictive element 115 from the outside. 11b, water and moisture do not enter inside, and
electrical insulation failure is unlikely to occur due to water and moisture. Further, 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, water, moisture and the like can be further prevented to the inside and
outside of the electrostrictive elements 11α and 11b. 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 11α, 11b. Fourth, the metal material 12 has a low density and a small
thickness in order to lower the mechanical Q. For this reason, in the conventional Langevin type
vibrator, the metal material 2 is directly connected by port bonding, and the acoustic radiation
surface of the metal material 2 is disturbed by the influence of the bolt, but according to the
present invention, the entire end face of the compression plate 19α 19 b Since vibration
transmission is made to the metal material 12 by this, the vibration of the acoustic radiation
surface 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. In addition, the load of water
is uniformly applied to the acoustic radiation surface, and the theoretical performance can be
obtained. EndPage: 4 The 5th has low mechanical strength when using a material of low density
for the metal material 2. Conventionally, creep is likely to occur in the screw part of the metal
material 2 by bolt bonding, and the electrostrictive elements 1α and 1b Although the problem of
stress relaxation occurred, according to the present invention, the metal material 12 does not
need to be provided with a screw, and it is possible to use an extremely rigid material with a
layer density for the compression plates 19α and 19h, There is no problem of stress relaxation
of the electrostrictive elements 11α and 11b due to creep etc. and the processing force (screw
hole, bolt through hole) of metal material 12.13 with large weight (about 1 醪 1) and related
shape It becomes easy to save, etc. processing. 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 In addition to the above, it is possible to minimize the handling in a state where
the metal material 12.13 is bonded and not to require much labor and equipment. In particular,
the effect of the present invention is remarkable in the case of a Langevin type vibrator which
has high efficiency at extremely low frequency (for example, 1 to 4 KBZ), can transmit high
power, and has low mechanical Q.
4. Brief description of the drawings FIG. 1 is a longitudinal sectional view showing a basic form of
a conventional bolted Lanschnonin 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 @ in FIG. 2, and FIG. 6 is a partial cross-sectional
exploded view of FIG. 5, FIG. 7 is a partial cross-sectional exploded view showing a modification
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of FIG. 5 and FIG. 6, and FIG. FIG. 9 is a cross-sectional view taken along the line A-A of FIG. 8,
and FIG. 10 is a cross-sectional view taken along the line B-B of FIG. 8, FIG. FIG. 12 is a
longitudinal cross-sectional view taken along the line AA of FIG. 11, and FIG. 11 is a longitudinal
sectional view showing a modification of FIG. 11, FIG. 14 is a cross sectional arrow view taken
along the line AA of FIG. 13, FIG. 15 is a longitudinal sectional view showing another
modification of FIG. 16 is a cross-sectional arrow view in the AA line of FIG. Description of
symbols 1 (α + h) + 11 ((Z, h); electrostrictive element 2.3 + 12 + 13; metal material 4 (α, h, c),
14 (α, b, r); adhesive "1" is a soft metal Plate 5, 15; bolt 7 (α, b, c) + 17 (α + h + ') i lead 19 (α,
b); compression plate 20 (α, h); electrical insulation plate 22; sealing ring agent patent attorney
thin 1) Interests Koto 3 Former Doto Doo End Page: 5 + No. 8 忽 8 times 矛 '71 side 10 10 side o
+ 1 face fan 120 attachments, 1: like [1 record (1) light t 5.1 j 1 (2)・ One side of 4 sides (: L + ',!
F 411 (4 /! 1, 'lpHflit book 1 other inventor, patent applicant or representative inventor EndPage:
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