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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound generator such as an audio device and a voice synthesis use device, and a piezoelectric
speaker for reproducing music. Prior Art Conventionally, in this type of piezoelectric sounding
body, the outer edge portion of a thin metal plate (picking plate) to which piezoelectric elements
are bonded is usually fixed to a ring-shaped plastic frame or a metal molded frame The Also, in
order to suppress the vibration, the metal frame is dealt with by making it thick and heavy.
Problems to be Solved by the Invention In such a conventional configuration, when vibration
from the diaphragm is transmitted to the frame and attached to the device, flickering often
occurs due to a gap between the button and the mating portion of the device. . The present
invention is intended to solve such problems, and an object of the present invention is to provide
a piezoelectric sounding body capable of making a frame thinner and lighter while improving
sound quality characteristics. Means for Solving the Problems In order to solve the problems, the
present invention is to insert a visco-elastic material such as a plastic film between two steel
plates instead of a conventional plastic or steel plate. The vibration control steel plate of the
structure which suppresses a back vibration is used. By using the frame made of the damping
steel plate, the imaging motion transmitted from the imaging plate to the frame is suppressed,
and the sound quality when attached to the device is improved. 1 and 2 are respectively a front
view and a side sectional view of a piezoelectric sounding body according to an embodiment of
the present invention, in which 1 is a piezoelectric element, 2 is a thin metal plate, 3 and 4 are A
lead wire connected to a piezoelectric element and a thin metal plate, respectively, and a frame 5
made of a damping steel plate having a structure to suppress a perturbation by sandwiching a
visco-elastic material such as a plastic film between two steel plates. 3 and 4 show another
embodiment, in which 6 is a soft material such as foamed plastic interposed between the outer
edge of a thin metal plate and a frame made of a distributed steel plate. Effects of the Invention
As described above, according to the present invention, it is possible to suppress imaging without
changing the number of parts and the structure, and further suppress imaging without requiring
a heavy frame, making the frame thinner. Weight reduction is possible.
Brief description of the drawings
1 and 2 are FfE and a top view showing an electric speaker according to an embodiment of the
present invention, a side sectional view and FIGS. 3 and 4, respectively, a top view and a side
sectional view according to another embodiment. It is.
DESCRIPTION OF SYMBOLS 1: ..... Piezoelectric element, 2 ...... thin metal plate, 6 .... Frame made
of damping steel plate, 6 ... Soft material.
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description, jps63314996
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