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JPS55123997

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DESCRIPTION JPS55123997
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross sectional view showing a conventional
piezoelectric buzzer. 2 is a sectional view showing an embodiment of the piezoelectric buzzer
according to the present invention, FIG. 3 is an exploded perspective view, FIG. 4 is a sectional
view of the piezoelectric vibrator used in the embodiment, and FIG. It is a bottom view which
shows the state which attached the vibrator | oscillator. 1.1 person · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · sound emission hole, 3 ° 3A · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · board ...... cylindrical
protrusion 12 ...... enclosed space, 20.23 ...... main electrode, 21 ...... intermediate electrodes, 22
and 26 ... · · · Disc-shaped piezoelectric ceramic, 24 · · · · · · · · · · · · · · · · · · · · · · · return electrode, 25
· · · 30A ~ 30c · · · · · · positioning groove, 31A ~ 31e · · · · · · · · contact pieces , 32 · · · · · · · · · bent
corner.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
buzzer using a piezoelectric vibrator. Piezoelectric buzzers have a feature that they are small in
weight and have no noise, and they are starting to be used for various public expenses in place of
conventional electromagnetic buzzers. FIG. 1 shows one example of a conventional piezoelectric
buzzer. In this figure, a case IKtj sound emission hole 2 is formed, and a position in the case 1
opposite to the sound emission hole 2 (piezoelectric vibration in 111 2Q 4 rlO The child 3 is
disposed. Further, in the case 1, a substrate 4 in which the oscillation circuit is assembled is
provided, and a lid 5 is provided at the case 1 opening. By the way, in the configuration as
described above, since the connection between the piezoelectric vibrator 3 and the oscillation
circuit on the substrate 4 is made by the lead wire soldered to the electrode of the piezoelectric
vibrator 3, the assembly operation is troublesome. In view of the above point, in view of the
above point, in the present invention, the oscillator circuit on the substrate and the piezoelectric
vibrator on the substrate can be provided by providing the contact piece on the substrate in
contact with the electrode of the piezoelectric vibrator. It is an object of the present invention to
provide a piezoelectric buzzer which has good assembly workability as it is connected to the
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above. Hereinafter, an embodiment of a piezoelectric buzzer according to the present invention
will be described with reference to the drawings. In FIGS. 2 and 3, two concentric arc-shaped
sound output holes are formed on the upper surface of one case, and a portion surrounded by
these arc-shaped sound output holes becomes the vibrating portion 10. -. In addition, a
cylindrical projecting portion 11 is integrally formed on the upper surface back side of the case
IA, and the piezoelectric vibrator 3A is attached to the cylindrical (2) 突出 projecting portion 11.
A sealed space 12 is formed by the vibrating portion 10 of the case IA, the cylindrical projecting
portion 11 and the piezoelectric vibrator 3A. Here, as shown in the piezoelectric vibrator 3AF1,
as shown in FIG. 4, the first disc-shaped piezoelectric ceramic 22 provided with an intermediate
electrode fi21 on the other surface, and the main electrode on one side. 23, the feedback
electrode 24 and the first output electrode 25 are bonded to the second disk-shaped piezoelectric
ceramic 26 provided with the intermediate electrode 21 on the surface of the pond so that the
intermediate electrode 21 is in contact with each other. The first intermediate electrode 21 is
connected to the lead-out electrode 25 by the conductive material 28 filled in the recess 27, and
the main electrode 20.23 is connected by the conducting wire. Then, as shown in FIG. 5, the
piezoelectric vibrator 3A is disposed such that the surface having the main electrode 23, the
feedback electrode 24 and the lead electrode 25 faces the case IA opening side. On the other
hand, positioning grooves 30A to 300 are formed on the inner circumference 111C of the case
IA, and the contact pieces 31 to 310 having elasticity are attached to the lid 4A in a positional
relationship corresponding to these.
Here, the contact pieces 31 to 310 are formed with an outwardly protruding 3) re-bent angled
portion 32 so as to be engaged with the positioning grooves 30A to 300 at the angled portion
32. It has become. Then, by inserting the core 4A into the opening of the case IA, the contact
piece 31A is in contact with the lead electrode 25, the contact piece 31E is in contact with the
main electrode 23, and the contact piece 310 is in contact with the return electrode 24. The
oscillation circuit and the piezoelectric vibrator 3A which are assembled in advance on the four
substrates are connected. According to the above embodiment, the following effects can be
obtained. (1) The piezoelectric vibrator 3A and the oscillation circuit on the lid combination
substrate 4A with the contact pieces 31A to 310 fixed to the lid combination substrate 4A Since
the connection is made, the soldering and wiring to the piezoelectric vibrator 3A become
unnecessary, the assembly operation is easy, and the disconnection accident can be eliminated.
(2) The positioning grooves 30A to 300 are formed on the inner peripheral surface of the case
IA, and these are engaged with the bent corner portions 32 of the contact pieces 31A to 310.
Therefore, erroneous insertion of the contact pieces 31A to 310 And (4) ○ can be reliably
prevented. (3) The cylindrical projecting portion 11 is integrally formed on the upper surface
back side of the case IA, the piezoelectric vibrator 3A is attached to the cylindrical projecting
portion 11, and the sealed space 12 is formed by a part of the case IA and the piezoelectric
vibrator 3A. As a matter of course, a sufficiently large sound pressure can be obtained. 0 It is also
possible to use, as a piezoelectric vibrator, one in which a piezoelectric ceramic is joined to a
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vibrating plate (metal plate). In addition, although the feedback electrode is provided for stable
oscillation, it can be omitted if necessary. In this case, two contact pieces ti may be sufficient. As
described above, according to the present invention, by providing the contact piece in contact
with the electrode of the piezoelectric vibrator on the substrate, the oscillation circuit on the
substrate is connected to the piezoelectric vibrator, so that the assembling operation is
performed. Get a good-quality piezoelectric buzzer.
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