JPH1127797A - Piezoelectric receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a piezoelectric receiver thin. SOLUTION: A receiver is provided with upper and lower cases 8, 10, a diaphragm 14 contained in the upper and lower cases 8, 10 and whose outer ridge is supported by the upper and lower cases 8, 10, and a piezoelectric ceramic 15 that is placed to at least either of front and rear sides of the diaphragm 14, part of the diaphragm 14 is extended to the outside of the upper and lower cases 8, 10 so as to form a 1st terminal board 16, the one end of a 2nd terminal board 18 made of a metallic plate is fixed to the piezoelectric ceramic 15 and the other end of the 2nd terminal board 18 is projected to the outside of the upper and lower cases 8, 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver such as a home telephone and a business phone, and a piezoelectric receiver used for mobile communication equipment such as a portable telephone and a transceiver.

[0002]

2. Description of the Related Art A conventional piezoelectric receiver has a configuration as shown in FIG. That is, in FIG. 2, 1 is a case,
This case 1 is composed of an upper case 2 and a lower case 3.

[0003] A diaphragm 4 is housed in the case 1, and an outer edge of the diaphragm 4 is supported by being sandwiched between the upper case 2 and the lower case 3.

[0004] Reference numeral 5 denotes a piezoelectric ceramic provided on the back side of the diaphragm 4, and one ends of lead wires 6 and 7 are fixed to the piezoelectric ceramic 5 and the diaphragm 4 by soldering.

In this state, the other ends of the lead wires 6 and 7 are drawn out of the case 1.

[0006]

However, the above-mentioned conventional piezoelectric receiver has a problem that its thickness is increased. That is, as shown in FIG. 2, the other ends of the lead wires 6, 7 are drawn out of the case 1.
The outer diameter of the lead wires 6 and 7 is large in order to maintain the strength, and when the lead wires 6 and 7 come into contact with the lower case 3, the vibration of the diaphragm 4 is hindered. As a result, the output sound pressure of the piezoelectric receiver decreases, so that it is necessary to provide a sufficient space between the diaphragm 4 and the bottom surface of the lower case 3, and as a result, the thickness of the piezoelectric receiver is increased. Had been lost.

Therefore, an object of the present invention is to reduce the thickness of a piezoelectric receiver.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a case, a diaphragm housed in the case and whose outer edge is supported by the case, and a surface of the diaphragm. A piezoelectric terminal provided on at least one of the back surfaces, a part of the vibrating plate is extended out of the case to form a first terminal plate, and the piezoelectric ceramic is a second terminal plate made of a metal plate. Is fixed, and the other end of the second terminal plate is projected out of the case.

That is, in the present invention, the conventional lead wire is abolished, and the first and second terminal plates are formed of a metal plate, so that the overall thickness is reduced.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a case, a diaphragm housed in the case and having an outer edge supported by the case, and a front and rear surface of the diaphragm. A piezoelectric ceramic provided on at least one side, and a part of the vibration plate is extended outside the case to form a first terminal plate, and the piezoelectric ceramic has one end of a second terminal plate made of a metal plate. And the other end of the second terminal plate is projected outside the case, wherein the first and second terminal plates made of a metal plate are pulled out of the case. Therefore, the thickness as a whole can be reduced as compared with the conventional case using lead wires.

[0011] The invention described in claim 2 of the present invention provides:
2. The piezoelectric receiver according to claim 1, wherein a terminal holding portion is provided at a lead portion of the first and second terminal plates of the case, wherein the first and second terminal plates contact each other by the terminal holding portion. 3. It can be fixed at a predetermined position without deformation.

Further, the invention according to claim 3 of the present invention is the piezoelectric receiver according to claim 2, wherein the terminal holding portion is formed outside the terminal holding portion of the case, wherein the terminal holding portion is provided. When connecting the external lead wires to the first and second terminal plates made of a thin metal plate, the connection can be surely made without deforming the terminal plates.

An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, reference numeral 8 denotes an upper case made of ABS resin, and a leakage hole 9 is provided at the center thereof. Reference numeral 10 denotes a lower case formed of ABS resin, and a sound emission hole 11 is provided at the center thereof. Further, an annular seat 12 is provided on the inner peripheral surface of the lower case 10. That is, when the upper case 8 is mounted on the lower case 10, the annular projecting portion 13 of the upper case 8 matches with the seat 12.

Reference numeral 14 denotes a circular diaphragm made of brass, an iron-nickel alloy, or the like, and a disk-shaped piezoelectric ceramic 15 is fixed to the surface thereof with an adhesive. The outer peripheral surface of the diaphragm 14 is held on a seat 12 in the lower case 10, and when the upper case 8 is mounted thereon, the protruding pieces 13
The outer peripheral edge of the diaphragm 14 can be held by the and seat 12.

In this state, a first terminal plate 16 is integrally formed with a part of the vibration plate 14 so as to protrude outward, and the first terminal plate 16 is a terminal holding member provided on the lower case 10. The other end is drawn out of the lower case 10 via the portion 17a.

On the surface of the piezoelectric ceramic 15, one end of a second terminal plate 18 made of brass, iron-nickel alloy or the like is fixed by solder 19, and the other end of the second terminal plate 18 is held. The lower case 10 is drawn out of the lower case 10 via the portion 17b. In connection with this drawing, holes 16a and 18b provided in the center portions of the first terminal plate 16 and the second terminal plate 18 are respectively connected to the terminal holding portions 17a and 17a.
The protrusions 20 and 21 provided on 17b penetrate.

If the upper case 8 is mounted in this state, the projections 22 and 23 of the upper case 8 provided to correspond to the terminal holding portions 17a and 17b may hang down. Thereby, the first and second terminal plates 16 and 18 are held.

The projections 22, 23 are provided on the projections 22, 23, respectively.
A hole into which 1 enters is provided. Now, in such a state, the other end sides of the first and second terminal plates 16 and 18 are held on terminal holding stands 24a and 24b integrally provided outside the holding portion of the lower case 10. And the first and second terminal plates 16 on the terminal holders 24a and 24b.
18 and the external lead wires are connected.

[0019]

As described above, according to the present invention, a case, a diaphragm housed in the case and whose outer edge is supported by the case, and at least one of the front and back surfaces of the diaphragm are provided. A piezoelectric ceramic, a part of the vibrating plate is extended out of the case to form a first terminal plate, and one end of a second terminal plate made of a metal plate is fixed to the piezoelectric ceramic. The other end of the second terminal plate protrudes out of the case. With this configuration, the first and second terminal plates can be made thinner than the outer diameter of the lead wire. It is possible to reduce the thickness.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a conventional example.

[Explanation of symbols]

 Reference Signs List 8 Upper case 9 Leakage hole 10 Lower case 11 Sound emission hole 12 Seat 13 Toroidal protrusion 14 Vibration plate 15 Piezoelectric ceramic 16 First terminal plate 16a hole 17a, 17b Terminal holder 18 Second terminal plate 18b hole 19 Solder 20, 21 Projection 22, 23 Projection 24a, 24b Terminal holder

Claims (3)

[Claims] 1. A vibrating plate, comprising: a case; a vibrating plate housed in the case and having an outer edge supported by the case; and a piezoelectric ceramic provided on at least one of front and back surfaces of the vibrating plate. A part of the plate is extended out of the case to form a first terminal plate, and one end of a second terminal plate made of a metal plate is fixed to the piezoelectric ceramic, and the other end of the second terminal plate is connected to the piezoelectric ceramic. A piezoelectric handset protruding outside the case. 2. The piezoelectric receiver according to claim 1, wherein a terminal holding portion is provided at a lead portion of the first and second terminal plates of the case. 3. The piezoelectric receiver according to claim 2, wherein a terminal holder is formed outside the terminal holder of the case.