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JPS4875184

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DESCRIPTION JPS4875184
-6 ° U (zone yen) Patent Office Commissioner Sasaki Gaku 発 t-Name of Tungji 為 臘 臘 2 2 2
inventor 発 明 悼 咋 氏 名 祥 善 善 郵 便 applicants zip code 144 address (location) Tokyo 芙FiJ
Name of appearance, T6, iF, o 4. Attached documents O brass ■ JP-A 48-75184 [phase]
published Japan Japanese 48. (1973) 10.9 examination request (all three pages) Office internal
reference number 1 o Japan classification 乙 17; 2 tlkt Il / It'e / 硼 一 "specification 1, title of the
invention
Langevin type oscillator-
5. Detailed Description of the Invention Conventionally, a Langevin type transducer in which an
elastic vibrator such as a metal material is bonded or attached to both sides of a piezoelectric
strain element is widely used as an ultrasonic transducer. Generally, piezoelectric strain elements
have high strength against compressive stress, but only small strength against tensile stress. The
element is prestressed in the compression direction in advance so that no tensile stress is applied
to the piezoelectric strain element even when the vibrator is extended to the maximum
amplitude, and the breakage of the piezoelectric element during strong vibration To prevent. The
present invention relates to an effective method of fastening for prestressing piezoelectric strain
elements as described above. Figure 1 shows an example of a conventional center bolt fastening
flange type (in the case of a ring type vibrator, an electrode plate 3 is disposed between facing
surfaces of electrostrictive elements 1 and 2). Conductor 9 brought into close contact with elastic
vibrator 8 and firmly fastened to bolt 5, washer 7 and nut 6 provided on the central axis of
elastic vibrator 4 and derived from electrode plate 5 An excitation power source is connected
between the elastic vibrator 8 in electrical contact with both outer surfaces of the electrostrictive
elements 1 and 2 and a lead wire 10 derived therefrom. Fig. 2 shows an example of a
conventional Langevin EndPage: 1 凰 oscillator with bolted outer periphery, in which the
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electrode plate 3 is disposed between the facing surfaces of the electrostrictive elements 1 and 2,
and the elastic vibrator 11 and Similar to the example of FIG. 1, the elastic vibrator 14 is in close
contact with the elastic vibrator 14, but in the vibrator, the elastic vibrator 11 and the surface of
the elastic vibrator 14 opposed to the electrostrictive elements 1 and 2 are used. The flanges 12
and 15 are provided, and the electrostrictive elements 1 and 2 are firmly fastened to both outer
surfaces with bolts 17 and nuts 18 in a plurality of cylindrical holes 13 and 16 bored in the
flanges, and the electrode plate 6 is led out. An excitation power source is connected between the
lead 9 and the lead 10 derived from the elastic vibrator 14. Fig. 3 shows an example of a
conventional Lanyard type vibrator with electrostrictive element-encapsulated screw-in clamp,
which has electrostrictive elements 1 and 2 with the electrode plate 3 narrowed, and elasticity
with a hole provided with a female screw 21. A vibrator 22 and an external screw 23 screwed to
the female screw 21 are provided, and the elastic vibrator 19 having a through hole 2 ot-is firmly
fastened to the center portion thereof, and the electrode plate 3 is a strain element 1 Between the
through-hole provided in the center of the core and the through-hole 2o provided in the center of
the elastic vibrator 19 between the lead 9 insulated and led out through the through-hole and the
lead 10 derived from the elastic vibrator 22. An excitation power source is applied. However, in
the central bolt-clamped vibrator in FIG. 1, the elastic vibrator 8 is strongly clamped near the
outer circumferential portion on the surface opposite to the electrostrictive element 2 and acts
downward as a component of force. As a result, the pressure on the joint surface is not uniform
throughout and the vibration characteristics are lowered, and the tendency is so remarkable that
the diameter of the vibrator becomes a dog.
In the case of the outer bolt fastening oscillator shown in FIG. 112, although the abovementioned drawbacks in the central bolt fastening oscillator shown in FIG. 1 and 1'-1 are solved,
the flange 12 for fastening the bolt 17 on the outer circumference and Since 15 must be
provided, the volumes of the elastic vibrators 11 and 14 are large because the flanges 12 and 15
project more than the effective diameters of the elastic vibrators 11 and 14, and waste of
processing the materials of the elastic vibrators 11 and 14 There are many and assembly is
complicated. , 1? In the element-encapsulated screw-in vibrator shown in FIG. 6, the precise
smooth finish of the bottom surface 24 of the elastic vibrator 22 requires a difficult and difficult
process, and the electrostrictive elements 1 and 2 are used during fastening. It is not necessary
to cause friction with the opposite surfaces of the elastic vibrators 19 and 22 or the electrode
plate 6 on any of the surfaces to damage the surfaces, and the electrostrictive elements 1 and 2
are elastic vibrators 19 and 22. And the concentric position deviates, and a sufficiently
satisfactory one such as deterioration of vibration characteristics can not be obtained. The details
and effects of the embodiments of the present invention will be described below with reference
to the drawings. In Fig. 1-4, the electrode plate 3 is provided between the facing surfaces of the
piezoelectric strain elements 1 and 2 and the opposing surfaces of the elastic vibrators 25 and
28 are overlapped from both outer surfaces of the piezoelectric strain elements. Then, the
external thread 27 provided on the elastic vibrator 25 and the internal thread 31 provided on
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one inner surface of the fastening ring 30 and the external thread 29 provided on the elastic
vibrator 28 and the other internal surface of the fastening ring 30 The male screw 27 of the
elastic vibrator 25 and the female screw 31 of the fastening ring 30 screwed with the male screw
27 are screwed to each other by the female screw 32 provided. The male screw 29 of the elastic
vibrator 28 and the female screw 32 of the fastening ring 60 screwed to the male screw 29 have
their screw directions reverse to each other. A through hole 26 is formed in the center of the axis
of the piezoelectric strain insulator 1 and the elastic vibrator 25 so as to electrically insulate the
positive electrode lead 9 from the electrode plate 3 from the inner surface of the through hole.
Further, the negative electrode lead wire 10 is derived from the elastic vibrator 28 electrically
connected to both outer surfaces of the piezoelectric strain elements 1 and 2. After the
circumferential rotation of the elastic vibrators 25 and 28 configured as described above is fixed,
when the fastening ring 30 is rotated in its screw direction, both elastic vibrators 25 and 28
become both positive electrostrictive elements 1 and 2 A uniform and strong fastening can be
performed over the entire surface without changing the concentric positional relationship. Fig. 5
shows an embodiment in which the present invention is applied to a step-type horn, and the
vibrator is also provided so as to resonate at one wavelength over the entire length, and the
vibration expanded at the narrow end of the elastic vibrator 28 is can get. As shown in this
embodiment, when the axial length with respect to the diameter of the elastic vibrator 25 is
short, according to the present invention, the plane adhesion is more effective than the central
bolt fastening vibrator.
Also in the Langevin resonator according to the present invention described in detail above, the
piezoelectric strain elements 1 and 2 have their electrodes EndPage: two plates 3 narrowed, and
the opposing surfaces are polarized to the same polarity. Accordingly, it is needless to say that
both outer surfaces are also identical to opposite polarity, and both of them are exemplified by
combining two piezoelectric strain elements, but it is achieved by a combination known in the
related art relating to the number of cylinders You can Furthermore, although the treatment of
the surface of the piezoelectric strain element is not individually described, various methods
achieved by the prior art, ie, soft noble metals on the smooth surface of the piezoelectric strain
element, for example Of an electrode thin film provided by vapor deposition or baking of gold or
silver, etc., or adhesion between the surface of the piezoelectric strain element and the surface of
the elastic vibrator and the electrode plate by precise planar polishing It goes without saying that
the same configuration is adopted regardless of the improved one. As described above, in the
Langevin-type vibrator according to the present invention, the planar adhesion between each
surface of the piezoelectric strain element and the electrode plate and the elastic vibrator
changes the concentric positional relationship between the components and the dog. Since it is
possible to fasten firmly, there is a significant effect on the improvement of vibration
characteristics. Also, the effect of improving the mass productivity is significant, depending on
the materials of each component, as well as processability and assembly.
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4. Brief description of the drawings Fang 1 is a conventional center bolt tightening ranch, (a
partial cross-sectional view of an N-type vibrator, FIG. 2 is a partial cross-section of a
conventional Langevin type vibrator with outer peripheral bolt tightening. Fig. 3 and Fig. 3 are
the conventional Langeun (a cross-sectional view of a ring-type vibrator 1, 1 to 4 is a crosssectional view of an embodiment of a Langevin-type vibrator according to the present invention;
FIG. 7 is a cross-sectional view of one embodiment of a Langeun type vibrator in which the
present invention is applied to a step horn. In the drawings (1) and (2) are piezoelectric
piezoelectric strain elements, (3) are electrode plates, and (4) (81 (ii) α 1⁄2 (29 (25) (2 B) is an
elastic vibrator, (9) (11 is a lead for applying excitation power, and (6 is a fastening ring). Patent
Assignee Taga Electric Co., Ltd. Representative Maki Asano EndPage: 3
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