JPH07203590A - Piezoelectric receiver - Google Patents

Abstract

PURPOSE:To obtain a piezoelectric receiver with superior productivity and few nonuniformity in an acoustic characteristic by containing and fixing a piezoelectric diaphragm in a case through the use of an adhesive material and adhering an insulated plate to the case so as to make space between it and the piezoelectric diaphragm. CONSTITUTION:The piezoelectirc diaphragm 13 where a piezoelectric ceramic plate 11 where an electrode is formed on both sides of it is fixed to a metalic substrate 12 by the adhesive material is contained in the case 15 with sound holes 14 and the peripheral part of it is fixed to the stage part 16 on the inner wall of the case 15 by the adhesive material. An adhesive layer is made on the both sides of the insulated plate 18 with the sound holes 17, an outer diameter is the same as the case 15 and it is adhesively connected to the opening part of the case 15. Then, in the combination of the piezoelectric receiver, the piezoelectric vibration plate 13 is adhesively fixed to the stage part 16 of the case 15 by utilizing the inner wall of the case 15 and the insulated plate 18 is adhered so as to permit the outer diameter to coincide with the opening part of the case 15. Thus, the nonuniformity in the acoustic characteristic caused by the shifting of the position of the insulated plate 18 as against the case 15 is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric handset used for mobile phones and the like.

[0002]

2. Description of the Related Art In a conventional piezoelectric receiver of this type, as shown in FIG. 3, a piezoelectric ceramic plate 1 is bonded to a metal substrate 2 by an adhesive.
The lead wire 3 is connected to the piezoelectric vibrating plate that is fixed to, the piezoelectric vibrating plate is housed in the case 4 having the sound hole 5, and the piezoelectric vibrating plate is fixed using an adhesive agent by the case 6 having the sound hole 7. Thereafter, a ring 8 of a cushioning material having an adhesive layer on both sides for fixing to the telephone is bonded to the case 6.

[0003]

As described above, in the conventional piezoelectric receiver, since the ring 8 of the cushioning material having the adhesive layer on both sides is used, the displacement when bonding to the case 4 occurs. However, there is a problem in that the productivity is lowered and the variation in the acoustic characteristics becomes large.

An object of the present invention is to eliminate the above-mentioned conventional drawbacks and to provide a piezoelectric receiver having excellent productivity and small variations in acoustic characteristics.

[0005]

In order to solve the above problems, the present invention provides a piezoelectric vibrating plate having a piezoelectric ceramic plate fixed to a metal substrate with an adhesive to form a space in a case having a sound hole. As described above, the adhesive is fixed and stored, and an insulating plate having an adhesive layer on both sides and having a sound hole and having the same diameter as the case is adhered to the case so as to form a space with the piezoelectric vibrating plate. It is configured by.

[0006]

In the above piezoelectric receiver, the piezoelectric vibrating plate, which is formed by fixing the piezoelectric ceramic plate to the metal substrate with the adhesive, is fixed and stored with the adhesive so as to form a space in the case having the sound hole, Since an insulating plate having adhesive layers on both sides and having sound holes and having the same diameter as the case is adhered to the case so as to form a space with the piezoelectric vibrating plate, productivity is improved,
It is possible to provide an inexpensive piezoelectric receiver by reducing the variation in acoustic characteristics and reducing the number of parts.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. Piezoelectric ceramic plate 11 having electrodes formed on both sides
A piezoelectric vibrating plate 1 formed by fixing a metal substrate 12 with an adhesive
3 is housed in a case 15 having a sound hole 14, and the case 1
The periphery is fixed to the step portion 16 of the inner wall of No. 5 with an adhesive. Sound hole 1
The insulating plate 18 having 7 has an adhesive layer on both sides,
The outer diameter is the same as that of the case 15, and it is adhesively bonded to the opening of the case 15. Reference numeral 19 is a lead wire drawn from the piezoelectric vibrating plate 13.

With such a configuration, when an input signal is applied to the piezoelectric vibrating plate 13 via the lead wire 19, the piezoelectric vibrating plate vibrates according to the input signal to generate a sound, and the sound hole 14 of the case 15 and the insulating plate 18 are vibrated. Sound is emitted from the sound hole 17 to the outside.

Further, in assembling this piezoelectric receiver, the piezoelectric vibrating plate 13 is adhered and fixed to the step portion 16 using the inner wall of the case 15 in the case 15 so that the outer diameter matches the opening of the case 15. It suffices if the insulating plate 18 is adhered, and it is possible to prevent the insulating plate 18 from being displaced with respect to the case 15 to cause variations in acoustic characteristics.

[0010]

As described above, according to the present invention, a piezoelectric vibrating plate obtained by fixing a piezoelectric ceramic plate to a metal substrate with an adhesive is used to form a space in a case having a sound hole. The product is improved in productivity by adhering to the case so as to form a space with the piezoelectric vibrating plate, which is fixed and stored using an adhesive layer on both sides and has a sound hole and has the same diameter as the case. It is possible to provide an inexpensive piezoelectric receiver by reducing the number of parts while reducing the variation in acoustic characteristics.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a piezoelectric receiver according to an embodiment of the present invention.

FIG. 2 is a sectional view of the piezoelectric receiver.

FIG. 3 is an exploded perspective view showing a conventional piezoelectric receiver.

FIG. 4 is a sectional view of the piezoelectric receiver.

[Explanation of symbols]

 1 Piezoelectric Ceramic Plate 2 Metal Substrate 3 Lead Wire 13 Piezoelectric Vibration Plate 14 Sound Hole 15 Case 16 Step 17 Sound Hole 18 Insulation Plate 19 Lead Wire

Claims (1)

[Claims] 1. A piezoelectric vibrating plate, which is formed by fixing a piezoelectric ceramic plate to a metal substrate with an adhesive, is housed and fixed using an adhesive so as to form a space in a case having a sound hole, and is bonded to both sides. A piezoelectric receiver in which an insulating plate having a layer and having a sound hole and having the same diameter as that of the case is adhered to the case so as to form a space with the piezoelectric diaphragm.