JPH0427278Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an electroacoustic transducer that can be incorporated into piezoelectric buzzers, speakers, microwave ovens, and the like.

Conventionally, as shown in FIGS. 4 and 5, this type of electroacoustic transducer has a cylindrical frame edge 3 integrally formed with a shielding surface 2 having a sound emission hole 1, and a cylindrical frame edge 3 on the lower side thereof. An exterior case is used in which the outer edges 4 and 5 are formed to form the corners of a right triangle, and the unimorph resonator 6 is fitted and fixed within the diameter of the frame edge 3.
5 has metal terminal pieces 7 and 8 protrudingly attached thereto, and these terminal pieces 7 and 8 are connected to the electrodes 6a and the diaphragm 6b of the unimorph vibrator 6 using lead wires 9a and 9b.

Problems that the invention aims to solve However, when this electroacoustic transducer is automatically inserted and mounted on a printed circuit board, the upper cylindrical part of the outer case is held between the left and right sides by the guide arms of the insertion head, so the mechanical The unimorph vibrator 6, which is directly fixed and supported by the cylindrical portion, is destroyed or deformed by the load, which tends to cause a change in the sounding state.

Means for Solving the Problems The electroacoustic transducer according to the present invention has a rectangular shielding surface, a quadrilateral outer frame rising along the edge of the shielding surface, and a rectangular shielding surface located inside the outer frame. The piezoelectric vibrator is fitted and fixed within the inner frame, and each terminal piece connected to the electrodes and diaphragm of the piezoelectric vibrator is mounted on the exterior case. It is constructed by protruding and mounting near the lower corner position of the case.

Function: In this electroacoustic transducer, a cavity is created between the outer frame and the inner frame at the upper corner of the outer case.
This exerts a buffering effect that does not apply mechanical load to the piezoelectric vibrator fixedly supported by the inner frame.

Embodiments The following description will be made with reference to FIGS. 1 to 3.

This electroacoustic transducer includes an exterior case 10 made of synthetic resin with an open back side, and is constructed by mounting a unimorph type piezoelectric vibrator 11 inside the case. The exterior case 10 has a sound emission hole 10
A slightly vertically elongated rectangular shielding surface 10b having a shape of 100 mm, a quadrilateral outer frame 10c rising along the edge of the shielding surface 10b, and a rectangular outer frame 10c located concentrically with the sound emission hole 10 within the outer frame 10C. It consists of a cylindrical inner frame 10d. The inner frame 10d contacts the outer frame 10c at three places, and is connected to the lower side of the outer frame 10c by a rib 10e. In this exterior case 10, there is a gap X between the inner and outer frames 10c and 10d located at each corner.
By providing the void X, it is possible to form a uniform finished surface with no irregularities and to reduce costs, compared to solid resin molding. A piezoelectric vibrator 11 is fitted and fixed to the exterior case 10 near the open edge within the diameter of the inner frame 10d. Further, metal terminal pieces 12 and 13 connected to the piezoelectric vibrator 11 are protrudingly attached near the lower corner of the outer case 10. These terminal pieces 12 and 13 are formed by shaping a metal material with good conductivity into a band shape, and a part of the terminal pieces 12 and 13 are formed in the outer frame 10c.
It is fixed by embedding it in the thick part of the
In addition, upside-down claws 12a, 13a are provided on the protruding end side of each terminal piece 12, 13 by cutting and raising the plate surface, and by engaging these claws 12a, 13a with the back side of the printed circuit board, the exterior case 10 can be opened. It can be mounted upright on a printed circuit board. The terminal pieces 12 and 13 are connected to the electrode 11 of the piezoelectric vibrator 11 using lead parts 12a and 13b formed continuously with the main body.
a, connected to the diaphragm 11b. Since only one end of the lead portions 12b and 13b needs to be fixed to the electrode 11a and the diaphragm 11b by soldering, the soldering process, which accounts for a large part of the component cost, can be simplified.

In the electroacoustic transducer configured in this way, even if the upper side of the outer case 10 is clamped from the left and right by the guide arms of the insertion head during automatic insertion into the printed circuit board, the gap X existing on the upper side is Since the piezoelectric vibrator 11 acts to buffer the mechanical load received from the inner frame 10d, the piezoelectric vibrator 11 fitted and fixed within the diameter of the inner frame 10d will not be destroyed or deformed.

In addition, although the above-mentioned embodiment has been explained based on the case where the sound emission hole 10a is provided on the plate surface of the shielding surface 10b, the case where the sound emission hole 10a is not provided and the exterior case 10 is
It can also be applied to things that form

Effects of the invention As described above, according to the electroacoustic transducer according to the invention, even when applied to automatic mounting, it is possible to reliably insert it into a printed circuit board without causing a situation where the sound generation state fluctuates. .

[Brief explanation of the drawing]

Fig. 1 is a rear view of the electroacoustic transducer according to the present invention, Fig. 2 is a front view of the transducer, Fig. 3 is a side sectional view of the transducer, and Fig. 4 is an electroacoustic transducer according to the conventional example. FIG. 5 is a rear view of the converter, and FIG. 5 is a front view of the converter. 10...Exterior case, 10a...Sound emission hole, 10
b... Shielding surface, 10c... Outer frame, 10d... Inner frame, 11... Piezoelectric vibrator, 11a... Electrode, 11
b... Vibration plate, 12, 13... Terminal piece, 12b,
13b...Lead part.

Claims (1)

[Claims for Utility Model Registration] (1) A rectangular shielding surface, a quadrilateral outer frame rising along the edge of the shielding surface, and a cylindrical inner frame located inside the outer frame. The piezoelectric vibrator is fitted and fixed into the inner frame of the outer case made of integral resin molding, and each terminal piece connected to the electrodes of the piezoelectric vibrator and the diaphragm is placed near the lower corner position of the outer case. An electroacoustic transducer characterized in that it is mounted protrudingly on. (2) The electroacoustic transducer according to claim 1, wherein the shielding surface has a sound emitting hole located on a concentric circle of the inner frame. (3) Claim 1 for Utility Model Registration, in which each of the above-mentioned terminal pieces is connected to the electrodes and diaphragm of a piezoelectric vibrator by a lead portion formed continuously with the terminal piece body.
The electroacoustic transducer described in Section 1.