JP3134643B2 - Piezoelectric receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric receiver used for a receiver such as a telephone or an intercom.

[0002]

2. Description of the Related Art Recently, some piezoelectric receivers have been adapted to automatic integration into a handset or the like. As this type of piezoelectric receiver, there is a piezoelectric receiver disclosed in Japanese Patent Application Laid-Open No. 4-365299, which has a structure as shown in FIG. That is, as shown in FIG. 3, the front and rear sides of a piezoelectric vibration plate 3 in which a piezoelectric ceramic plate 2 is bonded to a metal substrate 1 are sandwiched between a front case 4 and a rear case 5. The piezoelectric vibrating plate 3 is uniformly supported therebetween, and
A cushioning material 6 for keeping the airtightness of the back air chamber is sandwiched. Further, an acoustic resistance member 7 for damping the resonance of the piezoelectric diaphragm 3 and flattening the frequency characteristics is fixed to the rear case 5.
The front case 4 and the rear case 5 have a sound emission hole 4a and a leakage hole 5a, respectively. Furthermore, metal substrate 1
And a tongue extending from the periphery of the piezoelectric ceramic plate 2 is provided on a part of the periphery of the piezoelectric ceramic plate 2 so that the tongue 1a of the metal substrate 1 has a larger shape than the tongue 2a of the piezoelectric ceramic plate 2; The tongue pieces of the piezoelectric ceramic plate 2 are stuck together so that the tongue pieces 1a are inserted into the tongue pieces 1a, and the tongue pieces protrude from the outer peripheral parts of the front case 4 and the back case 5 to form an external conductive part.

[0003]

However, in the above-mentioned conventional configuration, when the lead wire is soldered to the external conductive portion when the piezoelectric receiver is incorporated into a handset or the like, the tongue-shaped external conductive portion is warped and the piezoelectric ceramic plate is bent. There was a problem of cracking in some parts.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. The present invention can be applied to automation of assembling a piezoelectric receiver into a handset or the like. An object of the present invention is to provide a piezoelectric receiver that can prevent cracks.

[0005]

In order to achieve this object, a piezoelectric receiver according to the present invention comprises a metal substrate and a piezoceramic plate provided with a tongue piece extending to an outer peripheral portion at a part of a peripheral portion thereof. And projecting the tongue on the outer periphery of the rear case to form an external conductive portion, and further extending a part of the front case to the outer periphery in the same or larger shape as the tongue of the metal substrate, It has a configuration in which it is sandwiched so as to overlap the tongue piece.

[0006]

According to this structure, since the external conductive portion is a tongue, the position is determined, so that it is possible to automate the incorporation into a handset or the like. Since the tongue piece extending a part of the case to the outer periphery is below the external conductive part, the external conductive part does not warp, and it is possible to provide a piezoelectric receiver that can prevent cracks from being generated in the piezoelectric ceramic plate.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a plan view of a piezoelectric diaphragm used for a piezoelectric receiver according to one embodiment of the present invention. In FIG. 2, a tongue piece 11a extending to the outer peripheral part is provided at a part of the peripheral part of the metal substrate 11, and a tongue piece 12a extending to the outer peripheral part is provided at a part of the peripheral part of the piezoelectric ceramic plate 12. The tongue piece 11a of the metal substrate 11 has a larger shape than the tongue piece 12a of the piezoelectric ceramic plate 12, and the metal substrate 11 is so fitted that the tongue piece 12a of the piezoelectric ceramic plate 12 fits inside the tongue piece 11a of the metal substrate 11. The piezoelectric vibrating plate 13 is formed by bonding the piezoelectric ceramic plate 11 and the piezoelectric ceramic plate 12 together. The electrodes 1 are provided on both sides of the piezoelectric ceramic plate 12.
4 are provided.

FIG. 1 is a sectional view of a piezoelectric receiver according to an embodiment of the present invention. 1, the outer peripheral portion of the piezoelectric vibrating plate 13 having the structure shown in FIG. 2 is sandwiched between the front case 15 and the rear case 16, and the tongue pieces 11a, 12a is protruded to serve as an external conductive portion. Further, the tongue pieces 11a, 1
The front case 15 has a tongue piece 15a which is the same as or larger than the tongue piece 11a of the metal substrate 11 and extends a part of the front case 15 to the outer peripheral portion so as to overlap with the 2a. Further, a cushioning material 17 for uniformly supporting the piezoelectric vibration plate 13 and maintaining the airtightness of the back air chamber is sandwiched between the piezoelectric vibration plate 13 and the rear case 16. Further, an acoustic resistance material 18 for damping the resonance of the piezoelectric vibration plate 13 and flattening the frequency characteristics is fixed to a portion of the leakage hole 16a in the rear case 16. Further, a sound emission hole 15b is formed in the front case 15.

[0009]

As described above, according to the present invention, since the external conductive portion of the piezoelectric vibrating plate is protected by the tongue piece of the front case, the position is determined. When assembling the lead wire into a handset, etc., when soldering the lead wire, the tongue part that extends a part of the front case to the outer peripheral part is under the external conductive part, so the external conductive part does not warp, A piezoelectric receiver that can prevent cracks can be realized.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a piezoelectric receiver according to one embodiment of the present invention.

FIG. 2 is a plan view of a piezoelectric diaphragm used in a piezoelectric receiver according to one embodiment of the present invention.

FIG. 3 is a cross-sectional view of a conventional piezoelectric receiver.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Metal substrate 11a Tongue piece 12 Piezoelectric ceramic plate 12a Tongue piece 13 Piezoelectric vibration plate 14 Electrode 15 Front case 15a Tongue piece 15b Sound emission hole 16 Back case 16a Leakage hole 17 Buffer material 18 Acoustic resistance material

Claims (1)

(57) [Claims] 1. A piezoelectric vibrating plate in which a piezoelectric ceramic plate is bonded to a metal substrate, a front case and a rear case covering the piezoelectric vibrating plate, and the piezoelectric vibrating plate sandwiched between supporting portions of the piezoelectric vibrating plate and the rear case. A buffer material that uniformly supports the piezoelectric diaphragm and maintains the airtightness of the space of the rear case, and an acoustic resistance material that dampens the resonance of the piezoelectric diaphragm fixed to the leakage hole of the rear case and flattens the frequency characteristics. A tongue extending from the outer periphery to a part of the periphery of the metal substrate and the piezoelectric ceramic plate, wherein the tongue of the metal substrate is larger than the tongue of the piezoelectric ceramic plate. Further, the metal substrate and the piezoelectric ceramic plate are bonded so that the tongue portion of the piezoelectric ceramic plate is inserted into the tongue portion of the metal substrate, and the outer peripheral portion of the front case and the rear case is attached to the metal substrate. A structure in which the tongue piece is protruded to form an external conductive part, and a part of the front case is extended to the outer periphery with a shape equal to or larger than the tongue piece of the metal substrate and overlaps with the tongue piece of the metal substrate; Piezo receiver.