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JPS54129281

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DESCRIPTION JPS54129281
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing an example of a vibrator
of a conventional piezoelectric buzzer. FIG. 2 is a circuit diagram showing an example of a
conventional drive circuit. FIG. 3 is a plan view showing a vibrating body of a piezoelectric buzzer
according to an embodiment of the present invention. FIG. 4 is a plan view showing a vibrating
body of a piezoelectric buzzer according to another embodiment of the present invention. FIG. 5
is a circuit diagram of a drive circuit used in another embodiment of the present invention. FIG. 6
is a graph showing the relationship between the aperture ratio and the vibration frequency.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a juicer buzzer for
producing an audible sound. Recently, instead of the conventional electromagnetic buzzer, there
is a tendency to use a piezoelectric buzzer using a piezoelectric element in various il + devices.
However, in the piezoelectric buzzer, since the imaging frequency depends on the thickness and
diameter of the peristaltic body, the small-sized piezoelectric buzzer has a drawback that it makes
a high sound and gives an unpleasant feeling. The present invention is intended to obtain a
piezoelectric buzzer which emits a relatively low sound even if it is small and which can stably
oscillate in a predetermined mode. That is, FIG. 1 is a plan view showing a vibrating body of a
conventional piezoelectric buzzer, and a metal plate (3) facing the other side of a lumi porcelain
disc (2) having an electric machine (1) formed on the surface of -10,000. Were made). Note that
(4) is a feedback electrode. When holding such a pregnant moving body as a shooting mode with
nodal support and fine movement nodal support, and driving with a drive (R) path such as the
second factor, the diameter of the steel plate is 27 cabinets, and the thickness is When the
diameter of the piezoelectric ceramic disk is 20 and the thickness is 115, the resonant frequency
fr of the peristaltic body is about 3 KHz. Such a piezoelectric buzzer has an excessive frequency,
which causes discomfort. Therefore, under 2 KHz jJ for military gardens is desired (2). In order to
lower the resonant frequency with the same material, the diameter of the vibrating body may be
increased and the thickness may be reduced, but industrially, a vibrating body having a large
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diameter and a thin thickness is difficult to create and has limitations in terms of strength It is
also disadvantageous in cost. In addition, smaller external dimensions are desired for
incorporation in small devices, and a piezoelectric buzzer that is small and not too noisy is
expected. FIG. 3 is a plan view showing the configuration of the vibrating body of the
piezoelectric buzzer according to the present invention embodiment Q), in which an electrode
(61) is provided on the negative side of a disc-shaped piezoelectric ceramic (32). In the case, a
net-like metal plate (36) is bonded to the entire curve with an adhesive. Here, epoxy adhesive 1
was used as the adhesive. (S4) is a turtle for return. In order to compare the embodiment reduced
to the third F with the prior art, the resonance frequency of the same size I as the prior art I:
shadow formation 17 was determined. Then, it has become clear that the conventional example
has a large number of waves (1.8 KHz) and a low frequency (il), whereas it is about 3 KHz. FIG. 4
is a plan view showing a pregnancy moving body of a piezoelectric buzzer according to another
embodiment of the present invention. In this embodiment, for return! & (44) is formed in a
uniform width so as to surround the main electrode (4), thereby improving balance of the
pregnancy moving element and suppressing oscillations other than the basic vibration mode iVIL,
including harmonic components It is a good small-sized piezoelectric buzzer of unnoticeable tone.
If the drive circuit is configured as shown in FIG. 5 and waveform shaping is performed by a
diode, better results can be obtained. Next, in the embodiment shown in FIG. 4, the change in the
fine movement frequency is shown in FIG. 1 when the ratio of the holes of the mesh-like metal
plate to the metal casing, ie, the aperture ratio, is shown in FIG. . The aperture ratio is i% as
apparent from FIG. It is effective to some extent, and the decrease in frequency gradually
increases. However, if the frequency is 80% or more, the frequency decreases, but problems such
as spuriousness occur, and the intensity is likely to be intermittent, and the range of about 50 to
80% is a soldier. The hepa-net-like metal plate was prepared by knitting a metal wire or 4), but it
was preferable that a metal plate was punched to open a large number of angular, half-cam-like,
round, etc. pores. It may be As the adhesive, in addition to epoxy-based ones, silicon-based
adhesives and the like produced good results. As described above, the present invention is a
piezoelectric buzzer characterized in that a mesh-like metal plate is covered with an adhesive on
one surface of a piezoelectric element, and an electrode is formed on the other surface of the
piezoelectric element. Even if it is small, it is extremely useful in one aspect, such as being able to
construct a low-power buzzer with relatively low co-image frequency.
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