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JPS54145082

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS54145082
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1A and 1B are a perspective view and a sectional
view showing a vibrating body portion of a conventional piezoelectric buzzer, respectively. FIGS.
2A and 2B are a perspective view and a sectional view showing a vibrating body portion of the
piezoelectric buzzer of the embodiment of the present invention. FIG. 3 is a sectional view
showing a piezoelectric buzzer according to an embodiment of the present invention. FIGS. 4A
and 4B are a plan view and a sectional view showing a vibrator portion of a piezoelectric buzzer
according to another embodiment of the present invention. FIGS. 5A and 5B are a plan view and
a sectional view showing a vibrator portion of a piezoelectric buzzer according to another
embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
buzzer C using a piezoelectric vibrator. Conventionally, as a vibrating body of a piezoelectric
buzzer, a so-called anyimorph vibrator formed by sticking a piezoelectric element on a vibrating
plate such as a metal plate has been used. すなわち。 Electrodes (2) are formed on both sides of
a plate-shaped piezoelectric ceramic (1) as shown in Fig. 1 (A) and (B) 1 and attached to a metal
plate (4) with a conductive adhesive (5) etc. It was The present invention incorporates a
piezoelectric buzzer C using a diaphragm such as a metal plate, etc. as an object, as an object of
the present invention, as a piezoelectric buzzer that efficiently generates sound at low voltage.
Hereinafter, the present invention will be described according to the drawings. FIGS. 2 (A) and 2
(B) are a perspective view and a sectional view showing a portion of a vibrating body according
to an embodiment of the present invention. That is, two pressure (2) current collectors (2 and 22)
are joined via the internal electrode (2M), and the piezoelectric body is provided with electrodes
(2 and (25) on its surface, respectively). . The arrow in FIG. 2 (B) is the polarization direction. FIG.
5 is a sectional view showing a piezoelectric buzzer according to an embodiment of the present
invention. That is, the vibrator (W) is fixed to the holding portion (s7) of the case (34) as shown
in 2811 (A) and (B). The holding portion (37) holds the vibrator at a node of the vibration of the
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vibrator. According to the present invention (in the case of (2), the metal plate h is a diaphragm
made of cone paper etc., and only the multi-layer piezoelectric vibrator is used as the vibrator t.
Fig. 2 (Fig. 2 shows an example of the piezoelectric buzzer according to the embodiment of the
present invention incorporated with a vibrator as shown in Fig. 2). The piezoelectric buzzers of
the present mis example show a 4 to 4 dB higher enjoyment, assuming that one piezoelectric
buzzer incorporating such a vibrating body is used as a sound-pressure rack. I! For low
frequency (3) sound generation desired as t =, piezoelectric pump, it is necessary to reduce the
thickness of the vibrating body so as to reduce the frequency, and only the thin multilayer
piezoelectric vibrator of the present application is vibrated. The piezoelectric piezoelectric body
is very advantageous because it can be easily thinned. Furthermore t5 KHzl! It stably oscillates in
the fundamental mode even at a low frequency of f. C: On the other hand, in the case of a
conventional book having a configuration in which other diaphragms are attached, the secondary
resonance of the high frequency component is easily generated in addition to the fundamental
mode if the frequency is 2 KHz or less. And, in the case of the comparative example, the resonant
impedance is 200 Ω in the case of the present embodiment, and it is as high as 4000 in the case
of the comparative example. I know that I can do it. That is, the present invention is a single
piezoelectric buzzer in which only the multilayer piezoelectric vibrator is used as a vibrating
body and another diaphragm etc. is used at all. In the following, particularly at C 20 Gμ or less,
the sound could be generated extremely stably and efficiently at ts x ax or less.
When the shape of the vibrating body is disk-like, if the diameter is D (4) thickness TI-t,-is 1 ×
10 or less and approximately 5D3 KHz or less, and -4 × 10- 'or less is extremely 2 KHz or less
Sound can be generated stably from efficiency, the tone is also very good, and it is particularly
good when created in this range. FIGS. 4 (A) and 4 (B) are a plan view and a sectional view
showing a vibrator portion of a piezoelectric buzzer according to another embodiment of the
present invention. That is, two piezoelectric bodies (4 and (42) are joined via the internal
electrode (45) 1 and the drive body (44) and the drive electrode are substantially surrounded on
the surface of the piezoelectric body (4). A feedback electrode (44) is provided, and an electrode
(45) is provided on the entire surface of the piezoelectric body (42) t. With such a configuration
and C: good-to stabilize the oscillation frequency by modulating the signal very well. The load on
the feedback electrode can be uniformly distributed to prevent generation of spurious. FIG. 5 is a
plan view and a cutaway view showing a vibrator portion of a piezoelectric buzzer according to
another embodiment of the present invention. (-) That is, two sheets of piezoelectric ceramic (5
and 52) are joined via the internal electrode (55), and the surface of the piezoelectric ceramic
(51) has a central portion I: main electrode (54) And a surrounding electrode (S4) is provided to
surround the main electrode. The surface 5: of the piezoelectric ceramic (52) has the same
configuration as the other surface, and is provided with a main electrode (s5) and a surrounding
electrode (57). The piezoelectric ceramic (5 and (52) #i is polarized with the main electrode (s4)
and the surrounding electrode (56) at the same potential, and the main electrode (55) and the
surrounding electrode (57) at the same potential. ing. Then, a piezoelectric buzzer is configured
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by using the main electrodes (54), (55) and the internal electrode (55) as a movable electrode.
According to the above configuration, the drive portion is at the central portion of the vibrator
and the radius of curvature of the vibrator is the largest at the central portion, and can be
efficiently driven with a small drive current as compared to the full m state movement. Presurrounding charge ll &: Because the polarization processing is performed uniformly to the edge
of the active electrode, it is possible to obtain extremely good effects, such as no distortion and
no loss of O-motion efficiency in the peripheral part (6) be able to. It will be understood that
good results can be obtained even if the surrounding electrode t-stripping is carried out so as to
wrap H the mode electrode and the return electrode in combination with the configuration of the
configuration company stripe 4 as shown in FIG. As described above, the present invention is a
piezoelectric buzzer using a piezoelectric element in which only a multilayer piezoelectric
vibrator in which two or more piezoelectric elements t are stacked is used as a vibrating body,
and improvement of driving efficiency is achieved. In addition to being able to be achieved, it has
an excellent effect such that sound generation at low frequency can be extremely stabilized by
thinning.
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