JPH07107587A - High breakdown voltage hydrophone - Google Patents

Abstract

PURPOSE:To maintain the intensity of the high polymer piezo-electric member and to improve the workability by providing a metal lead to be extended from the side of a dumper to the back end side and connecting the drawing part of the polymer piezo-electric member and the metal lead at the side of the dumper. CONSTITUTION:A metal lead 16 consisting of, for example, stainless is attained on both sides of a rubber dumper 9 and is extended to the back end. An exciter part 5 of a polymer piezo-electric member 2 is attached to a dumper 9 and a drawing part 6 is connected to the metal lead 16. In measuring the characteristic after attaching the polymer piezo-electric member 2 to the dumper 9, the metal lead 16 is connected to the terminal of the measurement device. Thus, the external power to be applied on the drawing part 6 can be reduced as it does not directly touch human's hands and terminals. Thus, the peeling of the drawing electrodes 8 and the polymer piezo-electric member can be prevented and the intensity can be maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a field of application of a high pressure resistant hydrophone, and more particularly to a high pressure resistant hydrophone for measuring a shock wave from a medical calculus breaking device.

[0002]

BACKGROUND OF THE INVENTION In recent years, with the development of medical equipment, calculi generated in, for example, the kidney have been crushed by shock waves from outside the body, and are known as calculus crushing devices. Generally, ultrasonic waves from the ultrasonic generator are focused on stones (focus)
To generate a shock wave. It is said that the shock wave of such a thing becomes about 1000 atmospheric pressure or more at the time of calculus crushing. Then, measure the level of these shock waves,
A high pressure resistant hydrophone has been proposed to clarify the causal relationship of calculus crushing. For example, one of the above is by the applicant (July 31, 1992)
High-pressure resistant hydrophone dated patent application, reference number P9
206300).

[0003]

2. Description of the Related Art FIG. 3 (abcd) is a diagram for explaining an example of such a high pressure resistant hydrophone. 2 (a) is a cross-sectional view of the high pressure resistant hydrophone, FIG. 2 (b) is a plan view of the polymeric piezoelectric material, and FIG. 2 (c) is a diagram of a damper to which the polymeric piezoelectric material is bonded. Drawing (d) is a figure of a relay tool. The high withstand voltage hydrophone has a polymeric piezoelectric material 2 provided on one end surface side of a cylindrical container 1 which serves as a shock wave detection surface.
The cylindrical container 1 has a hole 3 on one end surface side and is closed by a protective plate 4. The piezoelectric polymer material is made of PVDF (polyvinylidene fluoride), for example, and is made up of a vibrating portion 5 and a lead-out portion 6 (ab). The excitation electrode 7 (ab) and the extraction electrode 8 (ab) are formed on both main surfaces. The front surface of the vibrating portion 5 is adhered to the protective plate 4, and the rear surface is provided with a damper 9. The lead-out portion 6 (ab) is bent to the side surface of the damper 9 and extends to the rear end side. The excitation part 5 and the extraction part 6 (ab) are bonded to the damper 9. The leading end side of the pull-out portion 6 (ab) is the conductive portion 1 of the relay tool 10.
1 and a coaxial container 12 for connecting the cylindrical container 1
Electrically derived from the other end surface of the. In the figure, reference numeral 13 is a connector, 14 is a filler, and 15 is a lid.

[0004]

However, in the high pressure resistant hydrophone having the above structure, the lead-out portion 6 of the polymeric piezoelectric material 2 extends from the rear end side of the damper 9. Usually, in this state, it is measured whether the polymeric piezoelectric material 2 is adhered to the damper 9. That is, whether or not the damping action of the damper 9 is sufficient is determined by measuring the admittance characteristic. But,
In this case, for example, when connecting to a terminal or the like of the measuring instrument, the pull-out portion 6 touches the hand or directly contacts the terminal. As a result, an external force is applied to the portion bonded to the damper 9, and in particular peeling occurs between the one extraction electrode 8b and the polymeric piezoelectric material itself. That is, the polymeric piezoelectric material itself peels off with the extraction electrode 8b attached to the rubber damper 9. In particular, when the bonding work is performed again in the case of defective bonding, the polymeric piezoelectric material 2 is overloaded, and the lead-out portion 8
There is a problem that the bent portion of (ab) is damaged. From this, the polymeric piezoelectric material 2 bonded to the rubber damper 9
However, there was a problem that the workability was lowered due to the caution.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a high pressure resistant hydrophone having a structure in which the strength of a polymeric piezoelectric material is maintained and workability is improved.

[0006]

According to the present invention, a metal lead extending from a side surface of a damper to a rear end side is provided, and a lead-out portion of a polymeric piezoelectric material and the metal lead are connected on a side surface of the damper. To do. An embodiment of the present invention will be described below.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partial sectional view of a high pressure resistant hydrophone for explaining an embodiment of the present invention. It should be noted that the same parts as those of the previous conventional example are given the same numbers to simplify the description.
As described above, the high pressure resistant hydrophone is provided with the polymeric piezoelectric material 2 bonded to the rubber damper 9 on one end surface side of the cylindrical container 1 which serves as a shock wave detection surface. In this embodiment, metal leads 16 made of, for example, stainless steel are adhered to both side surfaces of the rubber damper 9 so as to extend to the rear end side. Then, the excitation part 5 of the polymeric piezoelectric material 2 is bonded to the damper 9, and the extraction parts 6 are connected to the metal leads 16, respectively. In addition, the metal lead 16 is the same as the relay device 10 described above.
Is connected to each line of the coaxial cable 12 directly or via an intervening wire, and is electrically led to the outside (see FIG. 3 (a) above).

With such a structure, the polymeric piezoelectric material 2
The metal lead 16 connected thereto is extended to the rear end side of the damper 9 without directly extending the lead-out portion 6 to the rear end side of the damper 9. When measuring the characteristics after the polymeric piezoelectric material 2 is bonded to the damper 9, the metal lead 16 is connected to a terminal such as a measuring instrument. Therefore, since the lead-out portion 6 of the polymeric piezoelectric material 2 does not directly come into contact with a human hand or a terminal, the external force applied to the lead-out portion 6 is reduced. As a result, peeling between the extraction electrode 8 and the polymeric piezoelectric material itself is prevented and the strength thereof is maintained. In addition, the handling is facilitated and the workability is improved.

In the above embodiment, the metal lead 16 is directly provided on the rubber damper 9, but, for example, as shown in FIG. 2, the damper frame 17 made of resin is provided on the damper 9.
The metal lead 16 may be provided on the damper frame 17. Other than the above, the invention can be arbitrarily modified within the scope of the present invention (see the above-mentioned high-pressure hydrophone of the application dated 1992).

[0009]

According to the present invention, the metal lead extending from the side surface of the damper to the rear end side is provided, and the lead-out portion of the polymeric piezoelectric material and the metal lead are connected by the side surface of the damper. It is possible to provide a high-voltage hydrophone having a structure that maintains the strength of the piezoelectric material and improves workability.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a high pressure resistant hydrophone for explaining an embodiment of the present invention.

FIG. 2 is a diagram of a damper particularly illustrating another embodiment of the present invention.

FIG. 3 is a high-voltage hydrophone diagram which is the basis of the present invention. FIG. 3 (a) is a cross-sectional view of the high-voltage hydrophone, FIG. 3 (b) is a plan view of a polymeric piezoelectric material, and FIG. FIG. 3C is a diagram of a damper to which a polymeric piezoelectric material is bonded, and FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 cylindrical container, 2 polymeric piezoelectric material, 3 holes, 4 protective plate, 5 excitation part, 6 extraction part, 7 excitation electrode, 8 extraction electrode, 9 damper, 10 relay tool, 11 conductive part, 1
2 coaxial cable, 13 connector, 14 filler, 15
Lid, 16 metal leads, 17 damper frame.

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[Procedure amendment]

[Submission date] September 8, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Fig. 1]

[Fig. 2]

[Fig. 3]

[Fig. 4]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a high pressure resistant hydrophone for explaining an embodiment of the present invention.

FIG. 2 is a view particularly showing a damper for explaining another embodiment of the present invention.

FIG. 3 is a cross-sectional view of a high pressure resistant hydrophone which is the basis of the present invention.

[Fig. 4] Fig. 4 is a high-voltage hydrophone diagram which is the basis of the present invention. Fig. 4 (a) is a plan view of a piezoelectric polymer material, and Fig. 4 (b) is a damper to which a piezoelectric polymer material is bonded. The figure and the figure (c) are figures of a relay tool.

[Explanation of reference numerals] 1 cylindrical container, 2 polymer piezoelectric material, 3 holes, 4 protective plate, 5 excitation part, 6 extraction part, 7 excitation electrode, 8 extraction electrode, 9 damper, 10 relay tool, 11 conductive part, 1
2 coaxial cable, 13 connector, 14 filler, 15
Lid, 16 metal leads, 17 damper frame.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadao Hirasawa 2 days 1275 Kamihirose, Sayama City, Saitama Prefecture

Claims (1)

[Claims] 1. A high-pressure device comprising: a polymeric piezoelectric material having a lead-out portion extending from an exciting portion; a cylindrical container that holds the front surface of the exciting portion in close contact with each other; and a damper provided on the rear surface of the exciting portion. In the pressure-resistant hydrophone, a metal lead extending from a side surface of the damper to a rear end side is provided, and a lead portion of the polymer piezoelectric material and the metal lead are connected on a side surface of the damper. Pressure resistant hydrophone.