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(2 mountains-1j) + patent-"Applicant 32-7151, Jl, 11/31/31 31" name of the inventor of the
government office of the licensee inventor ft "'Thi Tozuka Ward Totsuka Ward Yokohama City
Kanagawa Prefecture 216 ズ fl fl convex 1 static 4 片 こ: ° ° '' Ki, Suzuki Masafumi (one other
person) stock meeting it, II,!, 'I' self! 'L' I 'J In the telephone East Iff 27021]' + (people) <) 4. Name
(7237) Gu F 1 l jj thin 1) spice [phase] Japan Patent Office ■ JP 51-113594 13 published Japan.
(1976) 10. 6-持-5Q-, 3g 02 2 [phase] Application date Shoyo O, (197, [) 3.3 / internal reference
number 6g 2454 specification 1, name of the invention Langevin type vibrator 1, Title of the
Invention Langevin type vibrator
Lungee Pan Electric Nails
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a ranch of an electroacoustic transducer. The object of the present invention is to provide a
Langevin type transducer which generates relatively low frequency ultrasonic waves for use in
water, such as 1-BKIIZ ultrasonic waves, and high efficiency and extremely high acoustic output.
It compresses the piezoelectric electrostrictive element itself with a clamp made of a compression
plate and a bolt etc. to form a vibrating element, bonds the metal material of the roller to the
additional mass at its both ends, and makes the resonance unit It is a Langevin type vibrator
formed on Conventionally, when obtaining a relatively low frequency ultrasonic wave (e.g., 1 to 6
mz), the Langevin type vibrator has a long overall length and an enormous weight, so that cutting
of the metal material as an additional mass to the electrostrictive element as the driving source It
is useful to make the area ratio extremely large (cross-sectional area of electrostrictive element
<cross-sectional area of metal material). However, such a lange-pan transducer is satisfactory for
generating an acoustic output up to a certain degree, but in high power transmission due to high
acoustic density, the cross section of the electrostrictive element is small. There is. One of them is
that the electrostrictive element itself is broken at the time of high power transmission, and is
broken due to the generation of high tensile stress. 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, EndPage: 1 has been provided a Langeun type
vibrator in which an electrostrictive element and an adhesive portion are subjected to an oddeven stress from the past. It is a pair of metals 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, etc. by a Langevin type mobile element consisting of the electrostrictive element and the
adhesive There is a structure that connects the materials and applies a compressive force to the
electrostrictive element and the adhesive. Referring to FIGS. 41 to 4, one of the conventional
embodiments will be described. The electrostrictive elements 1a and 1b are bonded to each other
by the bonding portion 14C, and both ends of the electrostrictive devices 1a and 1b have
bonding wires α. Metal material 2.6 which is an additional mass according to 4b; The
electrostrictive elements 1α and 1b and the adhesives Aa, Ah and Ac metal are used to transmit
power at high power! Each mechanical bond is maintained by a washer 6 and a bolt 5 so as not
to be pulled apart, and configured as an integral Langevin type vibrator. The operation is carried
out by electric power by lead wires 7α, 7b, 7C, electro-mechanical conversion 75 is performed
by the electrostrictive elements 1a, 1b, vibration is transmitted to the metal d, and acoustic
radiation 8 is generated.
The prior art methods as described above have the following disadvantages. In general, it is
general that the performance is grasped only after the parts 41 are assembled together, and the
middle process (for example, only adhesion between the electro Element that. It is the
performance of things. It is difficult 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 for dyeing to assembly, and errors in tightening are difficult to occur unless
they reach the final stage. Unfortunately, all of the components fail if one of them causes a rough
match. In particular, in the case where many expensive electrostrictive elements are used in
order to exert high efficiency acoustically, the damage, including the labor required for the metal
material 2 and the assembly, is significantly reduced. い。 In addition, it is extremely
troublesome when a vibrator of the gods' performance is required. Second point is that it is
difficult to apply uniform l: F and @ force to the wax strain element and the adhesive. Especially
in the case of 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. And stress concentration in the compressed part can not be
avoided. Sixth, in the case of bolting, the head of the bold is exposed at the end of the metal
material, so water, moisture, etc. penetrates into the inside of the electrostrictive element from
between the metal material and the bolt, causing problems such as electrical insulation failure
Will occur. The fourth is extremely mechanical Q. In the case of obtaining a low-range lang-pan
type vibrator, a metal material on the acoustic radiation side uses a low density and thin object,
but in that case bolting causes non-uniform stress to the metal material and the metal material
becomes pregnant. The vibrational disturbance is generated on the acoustic radiation surface at
the moment, the power density of the acoustic radiation surface becomes nonuniform at the time
of transmission, and the cavity phenomenon tends to occur. -1 The performance according to the
theory is fast because the load of water does not adhere uniformly 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, causing a problem of compressive stress relaxation to the
compressed electrostrictive element and adhesive. The sixth one has a weight of about 20 to 60
kg and a 300-piece array in a Langevin type vibrator of this type. In the case of one set, etc., a
large bonding and tightening jig is required when assembling. , Need a great deal of force in
transport etc. Langeban type that has the problems as mentioned in the first to sixth mentioned
above, and the degree of the problem is low mechanical Q and can transmit high power at
extremely low frequency (for example, 1 to aKHz if f). In the case of the width mover, it can be
said that this is significant.
The present invention is provided with a compression plate for compressing the conventional
defects as described above, and the adhesive itself, and is compressed by a bolt or the like to
form a vibrating element 11, a metal with an additional quality at both ends Solution 1-7 is to
provide a Langevin-type vibrator that generates extremely high acoustic output of low frequency
and high efficiency by forming a single jointed material as one bonding unit. Hereinafter, the
present invention will be described in detail by way of examples. In Fig. 5 and @ 6, silver
electrodes are baked on both ends of the house or plural electrostrictive elements 11a and 11b.
EndPage: 2 made of piezoelectric ceramic, when used in plural, there is an adhesive or soft metal
plate 14C between each, adhesive or soft metal plate 1Aα also on both ends of the
electrostrictive elements 11α and 11h , 14b, compression plate 19α. 19b are installed, they are
compressed by means of spring washers 16.1-bolt 15 and configured as vibrating elements. The
compression plates 19a, 19b are electrostrictive elements 11CL, 11b% "and adhesive or soft
metal plate 14α. In order to uniformly apply a compressive force to each cross section of 1Ab
and 1Ac, any material made of metal, synthetic resin, glass, or porcelain may be used. The metal
material 12.13 is bonded or screwed to both ends of the above-mentioned vibration element by
the adhesive 1Ad, 111e or by the screw of a screw, and a resonance unit is formed. このように
1. The LANJONO-N type transducer of the present invention is configured. Metal material
12.15 is Lansche. Since there is an indispensable additional mass in the configuration of the panshaped vibrator, it needs to be acoustically considered, and in the case of this embodiment it is
cylindrical, but it is not particularly limited in its shape, it is conical It may be polygonal, and it is
necessary to have a surface which can be closely coupled to the compression plates 19a and 19h.
The electrode lead wires 17α, 17/1, 17 (? Power is supplied from the above to be electromechanically converted in the electrostrictive elements 11α and 11b +, and transmitted to the
metal material 12 through the compression plates 19a ′ and 19b so that vibration 11 is emitted
and acoustic radiation 18 is generated. The metal material 12 has no habit of receiving
transmission of imaging motion only by the cross-sectional area of the electrostrictive element as
in the prior art, and the compression plate 19 (transmission of imaging motion is received on the
entire surface of z do. Another embodiment of the present invention is shown in FIG. FIG. 7 is
similar in structure and function to FIGS. 5 and 6 of the first embodiment, and the numbers are
the same. In the first embodiment, the electrostrictive elements 11α and 11b, the four close
contact agents 1Aa, 14b and 1Ac, and the compression plate 19α are provided by one bolt.
Although the vibration element consisting of 19b was compressed, FIG. 7 of another embodiment
shows that the compressive stress is more uniform for the electrostrictive elements 11a and 11b
and the adhesive or soft metal plate 1Aα, IAh and IAC than the first embodiment. The purpose is
to provide a plurality of bolts to achieve the purpose. Still another embodiment of the present
invention is shown in FIGS. In Figs. 8 to 10, the actions and actions of the fifth and sixth figures
of the first embodiment are similar, the numbers are the same as in Table 12, and the new
elements are shown as new numbers. O (T 8 to 10 VC オ There is a need to use a large number of
electrostrictive elements 11 in order to obtain a high driving force acoustically, and there is a
need for electric insulating plates 20α and 20b and a compression plate 19α at both ends
thereof. , 19b, spring washers 16. By tightening the bolt 15 from the bolt 15, a compressive force
is applied to the electrostrictive element 11 and the bonding portion. Both ends of the Svl
element form a resonant unit by means of a metal material 12.13 bonded or screwed together to
form a resonant unit of the present invention. The metal material 12 has a much larger area than
the cross-sectional area of the electrostrictive element 11 in order to significantly lower the
resonance frequency and to prevent the cavity phenomenon: Since it is necessary to reduce the
equal mass mass as viewed from the electrostrictive element 11, the thickness to the diameter is
as thin as possible, and the material has a low density. According to the above configuration, the
present Langevin-type vibrator is applied with electric power from the electrode lead wires 17σ
and 17h connected to the relay terminals 21α and 21b and is electro-mechanically converted by
the electrostrictive element 11V1 so that the electric insulating plate 2oα and the compression
plate 19α Vibration is transmitted to the metal material 12 through the surface and the acoustic
radiation 18 appears to be like this. High power transmission with high efficiency and low
mechanical Q at relatively low ultrasonic same wave a (even if 1 to sKIIZ) It is possible to obtain a
Langevin-type oscillator capable of FIGS. 11 to 16 show an embodiment of another modification
of the moving element consisting of the 1 strain element of the Langevin type vibrator, the
adhesive outside and the soft metal plate or the compression plate of the present invention. Both
are electrostrictive elements 11α. 11b and the adhesive or soft gold 4 plates 1Aa, L4b and Ldey
are the same as the configuration of the vibration element shown in FIGS. 5 and 6 of the first
embodiment, but the compression method is different, and all are bolts I do not use it. That is, the
eleventh and 121st threshold values are obtained by compressing females and male screws
having a diameter smaller than the inner diameter of the electrostrictive elements 11α and 11h
by the compression plates 19α and 19b, and screwing each other to electrostrictive elements
11a and 114% s Adhesives 14α, 1ab, 1.
It is EndPage: 3 which adds compressive force to AC. In FIGS. 15 and 1A, the compression plates
19α and 19b contain flanges 23α and ′ ′ 25b which are larger in diameter than the outer
diameters of the electrostrictive elements 11α and 11h, and are relatively soft and elastic such
as rubber, etc. While preventing the fluid from being mixed into the electrostrictive element 11α
′ = 1 lb and preventing the transmission of S @ between the compression plates 19α and 19b.
In FIGS. 15 and 16, the compression plates 19α and 19h have screw portions 24 larger than the
outer diameter of the electrostrictive elements 11a and 11b and 12 tighten the screw portions
2A to form the electrostrictive elements 11α and 11b and the contact / adhesion agent 14cL. ,
14b and 14C. As described above, according to the present invention, as shown in FIG. 1 and FIG.
2], the distortion of the conventional Langevin type transducer by high power transmission of
half distortion α 1b and adhesive 4α. 4b, 4c against tensile failure! The electrostrictive
elements 11α, 11b and the adhesive or soft metal plate 14a, 14C14? And compression plates
19α, 19b with bolts 15 or compression plates 19α, 19b. The squeezing force is applied by itself
to solve the problem 1.1, the resonant unit is formed by bonding the indispensable metal
material in the configuration of the Langevin type vibrator to its both ends, and the high
efficiency is achieved at extremely low frequency. A high-power transmission is possible, and a
low-h Langevin type imaging moving mechanical with mechanical power is obtained, and the
following effects are obtained with respect to the conventional problems. First, compressive force
is applied by means of bolts 15 or compression plates 19α, 19b by providing electrostrictive
elements 11α, 11bb and adhesives 14α, 14b, 14cf compression plates 19α, 19b, and the
performance is confirmed as a vibration element) 1. Install metal material 12.13 at both ends of
the vibration element. After compression, the final confirmation should be made, and the
adhesion of the metal material 12.13 will have a performance of I / f <less elements, and the final
performance can be grasped by going to an intermediate factory. This means that many defects
can be prevented in advance, and-due to the performance of the vibrating element, a metal
material of an appropriate shape or material can be placed in place or screwed to minimize
variation in final performance. It is possible to change the resonance frequency, directivity, and
vibration mode as well. On the other hand, another advantage 1 in configuring the vibrating
element is that the compressive force-additional high power excitation test can be performed on
the electrostrictive element by the imaging element fluorescent unit, and it is large and heavy as
in the prior art It is extremely advantageous, unlike compression metal can not be added unless
the metal material is completely attached.
Second, by using the compression plates 19α and 11L4, the bolt 15 can be made extremely
short as compared with the conventional one, and it is not necessary to perform adhesion,
compression, etc. including conventional metal base material at the same time. Constraint force 5
smaller, size type improved, uniform compressive force now applied to electrostrictive element
1117.11.6 and adhesive coated soft metal plate 14α, 145.14Q, and so on Same as above. Sixth,
since the head of the bolt 15 is completely hidden by the metal material 13, water, moisture and
the like do not enter the inside of the electrostrictive element 111Z, 117> from the outside, and
electrical insulation failure occurs due to water, moisture, etc. 1 Hateful. Further, as shown in the
embodiment of FIGS. 16 to 16, by providing one such as -f outside the electrostrictive element, it
is possible to further prevent water, moisture and the like out of the electrostrictive elements
11α and 11b. Together with the electrostrictive element 11a. An inert gas or dry air or the like
useful for preventing air breakdown can easily be enclosed in the space 251C11 of 11.6 inside
and outside of the combined / underground space. Fourth, the metal material 12 is low in density
and thin in order to lower mechanical Qt. For this reason, in the conventional Langevin type Sa
child, the metal material 2 is bolted and connected with the IK, and disorder is caused by the
influence of the acoustic radiation surface i't bolt of the metal material 2, but according to the
present invention Since the imaging transmission is made to the metal material 12 by the entire
end face of 19α and 19b, the vibration lr of the acoustic radiation surface becomes uniform, and
the output density is uniform at the time of transmission so that the cavity phenomenon hardly
occurs and the output limit Stretch. In addition, the load of water is uniformly applied to the
acoustic radiation surface, and the theoretical performance can be obtained. The fifth uses the
material of low density Saki to metal material 2! In the prior art, creep occurs in the threaded
portion of the metal material 2 due to bolt bonding due to low mechanical strength in the near
field. Although stress relaxation is generated in the electrostrictive elements 1a and 1b,
according to the present invention, the metal-material 12 does not need to be provided with
screws and the compression plates 19α and 19! It is E = f ability to use a material with
extremely high rigidity and high density of lK, and there is no problem of stress relaxation of the
electrostrictive elements 11α and 11b due to creep or the like. Also related to this. Total weight
EndPage: 4 pieces of large size (about 16 kg) and processing of large-sized metal material 12 °
15 with a shape is easy to save processing of screw holes, bolt through holes, etc. Sixth, since the
metal material 12.13 can be bonded without using the final assembly jig, as in the conventional
case, the extremely large contact i-> and the clamping jig (in the case of the present invention,
the clamping is the imaging operation) Not only does it not need to be carried out in the state of
the device, but also it is possible to minimize board removal while metal material 12.13 is
bonded, requiring a great deal of labor and equipment.
There is no such effect. 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
KHz), 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 Langevin type vibrator, FIG. 2 is a longitudinal sectional view showing a
modified gold 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 vc of 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 all the modifications of FIG. 5
and FIG. 6; FIG. FIG. 9 is a cross-sectional arrow view taken along the line A-A in FIG. 8, and FIG.
10 is a cross-sectional arrow taken along the line B-B in FIG. FIG. 11 is a longitudinal sectional
view of the imaging element which is a component of the Langevin-type vibrator of the present
invention, and FIG. 12 is a sectional view taken along the line A-A in FIG. 11 is a longitudinal
sectional view showing a modification of FIG. 11, FIG. 14 i- is a transverse sectional view taken
along the line AA in FIG. 13, and FIG. 15 is a longitudinal sectional view showing another
modification of FIG. FIG. 16 is a cross-sectional arrow view taken along the line A-A @ Vc of FIG.
Explanation of symbols 1 (α, b), 11 (α, b): electrostrictive elements 2.3. 12. 13: metal material 4
(α, 6. C), 14 (α, A, c): four agents t soft f F gold J Ii plate 5.15: port 7 C α-b- ', 17 (a, b, c): lead
wire 19 (Α, b): Compression plate 20 (α, b) Double air insulation plate 22: Containment ring 7
′ ′ 2 agent agent patent attorney thin 1) interest, 1 +1 figure 2 figure; + 3 figure 4 aid
EndPage: 5 units + 3 figures. 矛 I + figure o, 2 figures lrj 牙 I 60 111 111 111 ll ′ l) 喝 □ q @ 1.
1. Town 1 town (2) 111 faces 1 town (Jun (jT: Jl + 1) Inventors other than the above, patent
applicants or agents Inventor Z ... i nail i mountain L end page: 6
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