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JPS55128098

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DESCRIPTION JPS55128098
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an embodiment of a
piezoelectric buzzer according to the present invention. 1 · · · Thin vibration film, 2 · · · ·
Piezoelectric film, 3 · · · · · · · · Ring-shaped support frame.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the construction
of a piezoelectric buzzer. The conventional piezoelectric buzzer has a structure in which a
piezoelectric ceramic such as PZT is attached on a metal plate such as a plus to form a sound
generator, and the sound generator is attached to a case. In such a piezoelectric buzzer, since the
thickness of the sounding body is large b, the acoustic impedance matching between the
sounding body at the time of driving and the air around the sounding body can not be performed
well, and the generation efficiency of the audible sound is poor. . Also, since the thickness of one
sounding body is large, a large amount of power is required to drive one sounding body. In
particular, in the case where a piezoelectric buzzer such as that described later is incorporated
into a small device such as an hour hand or a camera, there is a drawback that the consumption
of the micro battery is extremely heavy. (1) 72 F labor 1 · The present invention is an
improvement of the above-mentioned conventional piezoelectric buzzer and can be driven by
small electric power and has a piezoelectric impedance which is matched with an acoustic
impedance with an empty part. The purpose is to provide a buzzer. Hereinafter, an embodiment
of the present invention will be described in detail with reference to the drawings. wg1 in Fig. 1,
with a thin vibration rod, metal foil of stainless steel, aluminum etc., Mylar, 11: organic # such as
polyimide resin, inorganic pus such as glass, a2 振動 vibration waist 1 The piezoelectric ceramic
such as PZT * BaTiOa is on the vibration 111 with the piezoelectric film provided on #Fixed with
a lubricant or vibrate ZnO etc! It is constituted by sputtering or vapor deposition on 111. A ringshaped support frame 3 is provided with a thin vibration III provided with a piezoelectric film 2
under tension and attached to the frame 3 't' ba and 'piezoelectric! An electrical signal is added to
II2, and a sound generator fr consisting of piezoelectric $ 2 and vibration # 1 is vibrated to
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generate an audible sound. According to the wood embodiment, vibration @ 1 (2)-45 ,. Since it is
configured to be thin, it is possible to match the acoustic impedance of the sounding body at the
time of peristalsis of the sounding body and the acoustic impedance of the static electricity
around it, and an audible sound can be generated efficiently. In addition, because 1 sounding
body is thinly configured, the power required to drive the sounding body is very small and the
size is reduced, thereby promoting the reduction of power consumption. Further, in the case
where the one-invention buzzer is incorporated in the wristwatch, the structure can be simplified
by utilizing the frame of one watch as the supporting frame 6, and the number of parts can be
reduced. Furthermore, when the buzzer of the present invention is used for a small device using a
micro battery such as a watch or a camera, the effect of the reduction of the power consumption
can be found in bonding.
As described above for one or more of the present inventions, the piezoelectric film is provided
on a thin ti moving film to serve as a sounding body, and this sounding body is configured to be
attached to a ring-shaped supporting frame for reinforcement. For example, low power drive is
possible, and acoustic impedance matching with air can be made well.
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