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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing an example of a
typical drive circuit of a 3-terminal piezoelectric buzzer, and FIG. 2 is a sectional view showing an
embodiment of a 3-terminal piezoelectric buzzer according to the present invention, FIG. 3 is a
perspective view of the piezoelectric buzzer element constituting the piezoelectric buzzer as
viewed from below. 1 · · · Piezoelectric buzzer element, 1a · · · · · · · · · · · · · · Piezoelectric element,
1b · · · · · · metal diaphragm, lc, lc '· · · · · · · · · divided electrode for feedback (round electrode ·
Extended electrode) 1d · · · · · · Main electrode, 2.3.4 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · insulating case
DETAILED DESCRIPTION OF THE INVENTION The present invention provides a 3-terminal
piezoelectric buzzer // h 2 which is extremely easy to assemble and has particularly excellent
characteristics. . An example of a typical drive circuit of this three-terminal piezoelectric buzzer is
shown in FIG. 1, and the piezoelectric buzzer element 11 has two divided electrodes and an entire
counter electrode, and the output generated at the time of vibration is fed back to the
piezoelectric buzzer The sound is generated by driving 9 at the resonance frequency of the
element 11 itself. In FIG. 1, 12 is a transistor, 13 and 14 are resistors, 15 is a diode, and 16 is a
DC power supply. And, in the conventional piezoelectric buzzer, since lead wires are soldered and
used for connecting all the terminals to the piezoelectric buzzer elements, defects etc. occur in
the new combination of lead wires and soldering, and assembly man-hours are required. There
were also many characteristic problems. The present invention relates to a three-terminal
piezoelectric buzzer proposed to greatly improve the above-mentioned drawbacks. One
embodiment of the present invention will be described with reference to FIGS. 2 and 3. 2 and 3, 1
is attached to the piezoelectric element 1 ai made of metal element 1 ai made of baked silver
electrode, 3. The shape of the divided electrode for feedback is a circular electrode 1 C of the
central part of the element and the electrode 1 C This is a piezoelectric buzzer element
constituted by an extension electrode 1C 'extended in the vicinity of the outer periphery of the
piezoelectric element 1 and extended. Further, 2 indicates a contact point contacting the circular
electrode 1C, 3 indicates a contact point connected to the diaphragm 1b, and 4 indicates a
contact point contacting the main electrode 1dK of the piezoelectric element 1. Here, X marks in
FIG. 3 indicate representative positions of the contact points of the respective contacts 2 to 4. In
addition, 5 fixes the respective contacts 2 to 4 above, and a locking projection 6a provided on the
peripheral edge, and a ring-shaped projection 5b for supporting the piezoelectric buzzer element
1 provided protruding on the upper surface side. An insulating cover 6 having a ring-shaped
convex portion 8a for supporting the piezoelectric buzzer element 1 projecting from the inner
surface of the bottom portion, a through hole 6b for letting sound out at the center of the bottom
portion, and an opening side The insulating case has a hole 6C which engages with the locking
projection 5a provided on the As for assembly, first, install the piezoelectric buzzer element 1 in
the case 6 and make sure that the contact 4 and the extension electrode 1c 'do not overlap the
cover 5 in which each contact 2 to 4 is fully inserted and fixed beforehand. It may be press-fitted
and fixed to the opening of the case 6. As described above, according to the present invention,
since the contact point 2 is located at the center of the piezoelectric buzzer element 1, the
element 1 can be caseless with almost no directivity by taking a circular electrode 10 for the
feedback electrode at the center part. In addition, by providing the extension electrode 1c, it is
possible to increase the amount of feedback that plays a large role in the stability of oscillation.
Furthermore, since the three points on the element and the respective contacts can be connected
by contact, the number of assembling steps is extremely small, and there is an excellent effect
that there is no space on the connection by lead work.
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