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JPS51113593

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DESCRIPTION JPS51113593
:、:、41・4.。 -Patent application 31, v; Fl + 50 37131 □ application name of the
invention 'inventor I,' + 11-Kanagawa system-^ 1 yo h cover 216 粕 柊 ■ 皆 4 · (all '°' K 采 1
Election (I Yoka 1) Stock Association i ', l: L, I) Inside Si Works [Phase] Japan Patent Office ■
Japanese Patent Application No. 5-11135930 Published Japanese Patent Application No. 51.
(1976) 10.6 Office internal reference number 6824-54-specification 1, name of invention
Langevin type vibrator 1, name of invention Langevin type vibrator
U, Ji Puff Kai to Tin Li
Detailed Description of the Invention The present invention relates to the improvement of a
Langevin type transducer of an electroacoustic transducer. An object of the present invention is
to provide a low-frequency ultrasonic wave for use in water, such as a 1 to 8 H ultrasonic wave
and high efficiency f to produce a high-range, high acoustic output. It is a compression plate of
piezoelectric electrostrictive element itself. It is a Langevin-type vibrator in which a vibrating
element is formed by compression with a tightening object made of a bolt or the like, and a metal
material as an additional mass is adhered to both ends thereof to form a resonance unit.
Conventionally, when obtaining a relatively low-frequency ultrasonic wave e (for example, 1 to B
KHz), a Lange-Pan oscillator has a long overall length and a large volume of one distortion. It is
considered useful to make the cross-sectional area ratio of a metal material having a '-r'
extremely large (the cross-sectional area of an electrical and strain element <the cross-sectional
area of a gold * a). Although such a Lange-Pan oscillator is satisfactory for generating an acoustic
output up to a certain degree, the high acoustic density causes the cross section of the
electrostrictive element to be small in transmission of a large output. There's a problem. One of
them is that the electrostrictive element itself is broken by the generation of high tensile stress
during high power transmission. As is well known, the electrostrictive element has a
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characteristic of being strong in compression and weak in tension peculiar to porcelain. The
other one is that the contact points between the electrostrictive element and the metal material
and the electrostrictive element are separated due to the generation of high tensile EndPage: 1
stress at the time of high power transmission. From this, there has conventionally been provided
a Langevin-type vibrator in which the electrostrictive element and the bonding portion are
subjected to even-odd stress 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,
the Langevin-type vibrator consisting of the electrostrictive element and the adhesive and a pair
of metal materials having an additional mass can be maintained. The connection is made to apply
a compressive force to the electrostrictive element and the adhesive. That is, referring to FIGS. 1
to 4, one type of the conventional embodiment will be described. The electrostrictive elements
1α and 1b are adhered to each other by the adhesive 4c, and the adhesive 4α is attached to
both ends of the electrostrictive elements. The metal material 2.6 which is an additional mass is
adhered by 4 h. The electrostrictive elements 1α, 1b and the adhesive 4α, Ab, tic and the metal
material maintain their mechanical connection by the spring washer 6 and the port 15 so that
they are not separated at the time of high power transmission. Is configured as an integral
Langevin-type vibrator. In the operation, electric power is applied from the lead wires 7α, 7b,
7cVC, electro-mechanical conversion is performed by the electrostrictive elements 1α, 1h,
vibration is transmitted to the metal material, and acoustic radiation 8 is generated.
The above-described (and more prior art methods have the following disadvantages. The first is
generally that the performance is grasped only after the respective parts are assembled together,
and an intermediate process (for example, almost no adhesion force between the electrostrictive
elements alone is used because the compression force is not -2-). City, the performance of the
strain element itself. ) F to predict the final performance. むずかしい。 In this case, defects in
parts, for example, damage to the electrostrictive element, processing errors of metal materials,
adhesion during assembly, errors in tightening, etc. are difficult to find unless they finally reach
the end. Unfortunately, if one of them is roughly hit and causes a performance failure, all the
components become defective. Many expensive electrostrictive elements are used to make a
poem acoustically highly efficient. In such cases, the damage is significant, including the gold
steel and the labor required for assembly. If you need a vibrator of various performance, it is very
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, the bolt inevitably becomes long, and
the jig for bonding and compressing each part becomes extremely large, so the dimensional
accuracy of each is increased. And stress concentration in the compressed part can not be
avoided. Sixth, in the case of bolting, the head of the bolt is the terminal Kll of the metal material,
and the water and moisture grave penetrate into the inside of the strain element during the one
metal material bolt which is ff3- one, and electrical insulation failure etc. A problem arises.
Fourth, in the case of a very low mechanical Q lang-pan type moving member, the metal material
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on the acoustic radiation side is a low density thin object, but in that case it is not possible to use
metal material by bolting. A uniform stress is applied, and the metallic material causes a
disturbance of vibration on the acoustic radiation surface at the time of shooting, 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. Fifth,
when a low density metal material bolt is joined, the metal material causes a creep phenomenon
and causes a problem of compression resistance relaxation to the compressed two
electrostrictive element and the adhesive. The sixth has a weight of about 2 o to sa'g 4 in this
type of Lange-Pan oscillator, and! In the case where one set of 100-piece array is set, for
example, a large bonding and fastening jig is required when assembling, and a large amount of
labor is required for transportation and the like. Arrangement of rows 1 to 6 described above.
The degree of difficulty is particularly remarkable in the case of a Langie pan type rotator which
can transmit waves with a low mechanical Q and a very low frequency (eg 1 to aKflZ). I can say
Iko 2
According to the present invention, the conventional defect as described above is provided with a
compression plate for compressing the electrostrictive element and the adhesive itself,
compressed by a bolt or the like to form a vibrating element, and gold to the additional mass at
both ends thereof. The purpose of the present invention is to provide a Langevin-type vibratory
hammer which solves when bonding materials into one resonant unit and generates extremely
high sound output with high efficiency at low frequency. Hereinafter, EndPage will be described
in detail by embodiments of the present invention. In FIG. 5 and FIG. 6, the electrostrictive
element 11α, “4b consisting of a fixed number or plural pieces is made of piezoelectric ceramic
with a silver electrode baked at one end, and when plural pieces are used, an adhesive or There is
a soft metal plate 141C, adhesive or soft metal plates 1Aa and 1Ab on both ends of the
electrostrictive elements 11α and 11h, and a compression plate 19a. 19 h are installed and
compressed by spring washers 16 J-bolt 15 and configured as a vibrating element. The
compression plates i9a and 19b are plates which apply compressive force uniformly to the cross
sections of the electrostrictive elements 11α and 11h and the adhesive or soft metal plates
14α, 1Ab and 1AC, and are made of metal, synthetic resin, glass or porcelain It is either.
Adhesive @ 1Ad, 1Ae or by screw etc. on the both ends of the image pickup element mentioned
above by gold @ @ 12.13 force I contact 4-! Or screwed to form a resonant unit. Thus, the
Langeun type vibrator of the present invention is configured. The metallic material 12.13 needs
to be considered acoustically in order to obtain an additional mass which can not be lacking in
the configuration of the Langevin type vibrator, and in the case of this embodiment, it has a
cylindrical shape. However, the shape is not particularly limited, and it may be conical or
polygonal, and may be opposed to the compression plates 19α and 19b. Need to have surfaces
that allow for tight coupling. With the above structure, electric power is supplied from the
electrode leads 1li17a and 17J17C, subjected to magneto-mechanical conversion by the
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electrostrictive elements t1a and 11h, and transmitted to the metal member 12 through the
compression plates 19α and 19b to generate acoustic radiation. 18 Since the metal base 12
does not receive the transmission of imaging motion 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 of the compression plate 19σ, so the acoustic radiation surface vibrates uniformly.
Another embodiment of the present invention is given in FIG. FIG. 7 shows the fifth embodiment
of the first embodiment, FIG. 6J-The structure and function are similar, and the number is [7]. In
the first embodiment, one bolt f electrostrictive element 11z, 11b, an adhesive 1Aa, 1Ab, 1Ac, a
compression plate 19a.
19b is a 1-compressing vibrator, but FIG. 7 of another embodiment is an electrostrictive element
11α, 11b and an adhesive coated with a flexible metal plate 14α, 1ab, 11ic according to the
first embodiment. The purpose is to apply a uniform compressive stress and to achieve the
purpose by arranging a plurality of bolts. 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 FIGS. 8 to 10, the vibration element uses a large number of electrostrictive elements
11 in order to obtain an acoustically high driving force. The electric insulators 20α and 20h and
the compression plates 19a and 19b are installed at both ends, and spring washers 16J-bolts 15
are fastened to the electrostrictive elements 11 and bonding portions by tightening the bolts 15.
Compressive force is applied. A resonance unit is formed by the metal material 12.13 being in
contact and screwed on both ends of the vibrating element to form a resonance unit of the
present invention. In order to lower the resonance frequency significantly and to prevent the
cavity phenomenon, the metal material 12 is disconnected from the electrostrictive element 11!
From <1 fifi I; <Because it is necessary to reduce the isometric positioning seen from the
electrostrictive element 11 having a large area and a drive source to reduce mechanical Q, the
thickness with respect to the diameter is as thin as possible, and low There is a material of
density. According to the above configuration, the present Langevin-type vibrator is applied with
power from the electrode lead wires 17a and 17b connected to the relay terminals 21a and
21bvc, and is electro-mechanically converted by the electrostrictive element 11, and the
electrical insulating plate 20α and the compression plate The imaging motion is transmitted to
the metal material 12 through 19a, and the acoustic radiation 18 is generated. In this manner, a
Langevin-type vibrator having a low mechanical Q and capable of high-power transmission with
high efficiency can be obtained at a relatively low ultrasonic wave cap (for example, 1 to 8 KH;
1). FIGS. 11 to 16 show another plaster-shaped embodiment of the electrostrictive element of the
Langevin-type vibrator according to the present invention and an imaging element composed of
an adhesive covered soft iron plate and a compression plate. In any case, the electrostrictive
element 11α, 11bJ-sensing agent or soft gold plate 1Aa, 1Ab. 11c shows the configuration A-I of
the vibration element shown in the fifth and sixth embodiments of the first embodiment, but the
compression method is different, and both use bolts. ていない。 That is, FIGS. 11 and 12 show
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that the compression plates 19a and 19b have a female thread and a male thread having a
diameter smaller than the inner diameter of the strain element 1112.11b, and the EndPage: 3 is
screwed together to form an electrostrictive element 11α.
A compression force is applied to 11 / + and the adhesive 14α, 1ab, 1ac. Figs. 1'5 and 14 show
that the compression plates 19α and 19b have flanges 26α and 25b having a diameter larger
than the outer diameter of the wedge strain violet 11 (Z and 11b, and relatively elastic elastic
material such as rubber is enclosed. A ring 22 is attached to prevent mixing of fluid into the
electrostrictive elements 11α and 11b, and a compression plate 19 (Z. 19b It prevents
transmission of mutual vibration. In FIGS. 15 and 16, the compression plates 19α and 19 + 6 are
electrostrictive elements 11a. It has a screw portion 2A larger than the outer diameter of IL6 and
applies a compressive force to the electrostrictive elements 11α and 11b and the adhesives
14α, 1Ab and 1Ac by tightening the screw portion 24. As described above, according to the
present invention, as shown in FIGS. 1 and 2 (, the electrostrictive element 1 (7, 1b and adhesive
4α by high power transmission of the conventional Langevin type thermostat). For tensile
failure of Ah and At, the electrostrictive elements 11a and 11b and adhesive or soft metal plates
1Aa and 14b and 1AcJ-compressed plates 19α and 19b shown in FIG. The compressive force is
solved by the bolt 15 or the compression plate 19α, Cqh itself, and the resonance unit is formed
by bonding the indispensable metal material to the both ends of the Langevin type vibrator VC.
An extremely low frequency f high efficiency gold, and high power transmission is possible. A
mechanical Q low Langevin oscillator can be obtained, and the conventional difficulty has a 17thorder effect. First, by providing the compression plates 19σ and 19b with the electrostrictive
elements 11cL and L1 and the adhesives 1aa, 14b and 14c, a compressive force is applied by the
bolt 15 or the compression plates 1qa and 19b itself, and the performance as a vibrating element
is obtained. Confirm and put metal materials 12 and 115 on both ends of the vibrating core and
compress it (after second order, final confirmation should be done if it is j <l, metal material 12.1!
There is no factor that the performance fluctuates due to the acceptance of l, and the final
performance is grasped 7 'in the middle process. This can prevent the occurrence of many
defects in advance, and by bonding or screwing a metal material of an appropriate shape and
material depending on the performance of the vibrating element, the If performance of the final
performance will be minimized. It is possible to change the resonance frequency, interdigitality,
and vibration mode, as in the case of '7' and k. On the other hand, another advantage of
constructing a vibrating element is that a compressive force can be applied to the electrostrictive
element, and an excitation test by a high power can be performed by the vibrating element
Kundan, and it has a large size of 1 as before. It is extremely advantageous that no compressive
force can be applied if no metal material is attached.
Second, by using the compression plates 19q and 19h, it is extremely short F ′ ′ compared to
the conventional one of the Port 15 company, and it is not necessary to perform adhesion,
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compression, etc. including conventional metal materials at the same time. Bonding, compression
jigs are small, dimensional accuracy is the same, electrostrictive elements 11d and 11b and
adhesive soft metal plates 1Aα, 1AJIACfc uniform compressive force can be applied, and the
quality is improved compared to the conventional one. Sixth, since the head of the bolt 15 is
completely hidden by the metal plate 16, the electrostrictive elements 11a, 111! Water and
moisture do not intrude into the inside of +, and water and moisture etc. 'not likely to cause
electrical insulation failure. Also, as shown in the embodiment of FIGS. 16-16, 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. An inert gas or
dry air or the like useful for the prevention of the fuse breakdown can be easily enclosed in the
space 25 of extremely small capacity inside and outside of the electrostrictive elements 11α and
11b. Fourth, the metal material 12 has a low density density so as to lower the mechanical Q. In
this conventional Langevin-type vibrator, the metal material 2 is directly bolted, and the acoustic
radiation surface of the metal material 2 produces the distortion of the bolt shadow. According to
the present invention, the compression plate is used. Since vibration is transmitted to the metal
material 12 by the entire end faces 19a and 19b, sound emission and imaging of the radiation
surface become uniform, and since the output density is uniform at the time of transmission, a
cavity phenomenon hardly occurs, and The limit extends. The load of the literary person is
uniformly attached to the acoustic radiation surface, and the theoretical performance can be
obtained. Fifthly, when a low density material is used for the metal material 2, the mechanical
strength i is low, so conventionally, creep is likely to occur in the screw portion of the metal
material 2 by bolt bonding, and stress is generated in the electrostrictive elements 1α and 1b.
Although the problem of relaxation occurred, according to the present invention, the metal
material 12 does not need to be screwed, and it is possible to use an extremely rigid material
with high density EndPage: 4 for the compression plates 19cz, 19b, There is no problem of
repulsive force relaxation of the electrostrictive elements 11α and 11b due to creep or the like.
Further, in connection with this, the processing of a large weight (about 10 cm) and large shape
metal material 12.degree. 16 can simplify the processing of screw holes, bolt through holes and
the like. Since the crucible 6 can be bonded without using a jig in the final assembly of the metal
member 12.13, the adhesion and clamping force A are extremely large as in the prior art (in the
case of the present invention, the clamping means the state of the imaging element In addition to
the above, the metal material 12.13 may be handled with the metal material 12.13 bonded to a
minimum, and not requiring much labor and equipment.
The effects of the present invention are particularly remarkable in the case of a Langevin-type
vibrator having a low efficiency (for example, 1 to tUIZ) f and a high power transmission
capability, and a low olfactory m-like Q.
4. Brief description of the drawings. FIG. 1 is a longitudinal sectional view showing the basic form
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of a conventional bolted Langevin type vibrator, FIG. 2 is a longitudinal sectional view showing a
modification of FIG. 1, and FIG. 4 is a cross-sectional arrow view taken along the line A-A of FIG.
2, and FIG. 5 is a basic form of the embodiment of the Langevin-type imaging element of the
present invention 6 is a partial cross-sectional exploded view of FIG. 5, FIG. 7 is a partial crosssectional exploded view showing a modification of FIGS. 5 and 6, and FIG. 8 is a Lange van type
imaging motor of the present invention. One example of a longitudinal IfI view shown in gold,
FIG. 9 is a cross-sectional arrow view taken along the line AA of FIG. 8, FIG. 10 is a crosssectional arrow view taken along the line B-B4 in FIG. The figure is a longitudinal sectional view
of the image pickup element of the roller which is a component of the Langevin type image
pickup motor of the present invention, $ 12 FIG. , FIG. 15 is the i111! A longitudinal sectional
layer showing a deformation of +71, FIG. 14 is a cross sectional arrow view taken on line A-A in
FIG. 16, FIG. 15 is a longitudinal sectional view showing another deformation of FIG. It is a cross
section arrow line view in the AA of FIG. Description of symbols 1 (α, b), 1 f (α, b): fi strain
element 12.3, B, 13: metal material d (a, S, c), 1 A (a, b, c): adhesive Or soft metal plate 5.15 ':
port 7 (α, b, C), 17 (α, / l, ('): lead wire * q (a, force): compression plate 20 (σ, b): electricity
Insulating plate 22: Encapsulation ring agent patent attorney thin 1) i + 1 side + 2 凋 10] hope 1
+1 attack 9 EndPage: 5 ÷ 1 り り S 圀 1 p 5 F 11 I IZ 'IQ attachment, 1:: inventory list 1 (2) 14
blood IJ mountain () no j () 11 (1) 11- 'IH secondary 1 1 inventor, patent applicant or agent
inventor' '' '' 17 17 Mountain i- 讐 EndPage: 6
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