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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing the structure of
a conventional speaker, FIG. 2 and FIG. 3 are cross-sectional views showing an example of a
piezoelectric speaker according to the present invention, and FIG. It is a figure showing the
characteristic of two forces. 1 ииииии Resonance tube, 2 иии и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
Piezoelectric element, 5 и и и и и и и и Plates 6 иии и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и Piezoelectric
element, 9 и и и и и и и и и и и и и и и Air room.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a piezoelectric speaker using a piezoelectric element. First, ? 1-shows a conventional
structure, 1 is a resonance surface, and a sound emission hole 2 is provided. The piezoelectric
element 4 is attached to the end of the resonance cylinder 1 ((in which the diaphragm 5 is in
sympathy and further with the end plate 6, one to seven)) 'and j-77. The piezoelectric speaker
having such a configuration generates a voltage of 41 til + in the piezoelectric element. The
disadvantage of this structure is that the structure of the moving plate 5 is relatively simple, so
that the resonance characteristics are read <and the sound pressure peaks and valleys are large,
or because the piezoelectric element 4 is stuck, the rigidity of the moving plate 5 is (Resonance
frequency is high), bass can not be obtained. In order to improve the above-mentioned
drawbacks, the idea is to run 0, which is a relatively easy structure and a broadband piezoelectric
speaker. FIG. 54 shows an embodiment of the present invention. The vibration plate 7 has a
plurality of crotch portions formed around one foot. This diaphragm 7. (i) It is obtained by
drawing of a metal plate or by forming a plastic plate. A ring-shaped pressure element 8 is fixed
to the step 9. A sound release hole 6 is opened in the sound release plate 5, and the periphery of
the swing plate 30 is fixed to the periphery. Therefore, an air chamber 10 is formed by the
diaphragm and the sound output plate. The frequency 1 / La-2-number characteristic of the
sound pressure of the piezoelectric speaker according to the above configuration is as
schematically shown in FIG. That is, compared to the chronic structure of the conventional
structure shown by the broken line, the band available for sound is wide and still more excellent
in two levels. The diaphragm 7 has a flat portion in the center, and the portion is a flexible 1slack, because the piezoelectric element is not attached. Not only is it ok to play low-pitched
sounds, but the level also improves. The special condition at the resonance point is smoothed for
what to do in the end part, and the number of collusion points is also increased according to the
number of steps. Furthermore, as the Helmholtz's resonator with the air jet 10 and the sound
emission hole 6 The fourth point of the 2j-th loud speaker is the solid line in FIG. FIG. 6 is
another embodiment. In this figure, the shape of the piezoelectric element 3 is different from that
of FIG. 2 in FIG. 1, and it is preferable to set an electrode on the inner and outer peripheral side
face of & lt; However, the piezoelectric element 8 in FIG. 4 has a scooping ring shape i, and it is
more advantageous to drive by providing electrodes on the upper and lower surfaces. According
to the present invention, a good piezoelectric speaker can be realized with a relatively easy
structure according to the present invention.
The point is central b! Flat 11 (, by forming a step around the periphery and fixing a ring-shaped
piezoelectric element to the step, it is possible to easily obtain a wide band and the shape of the
diaphragm to determine the position of Helmholtz It is to form a resonator. The alarm sound,
meroti and color of the 1 / type 1 portable device are used for the purpose of generating the
study of orchids by voice, and they are used for practical use.
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jps56157899, description
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