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JPS57131081

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DESCRIPTION JPS57131081
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a cross-sectional view of a conventional
earphone. FIG. 2 shows an example of the shape of the piezoelectric diaphragm used in the
present invention. FIG. 3 shows a cross-sectional view of the earphone of the present invention.
FIGS. 4 and 5 are cross-sectional views showing an arrangement example of the piezoelectric
diaphragm in the earphone according to the present invention. The numbers in the figure
indicate the following. 1 · · · Earplugs, 2 · · · · · · · · · · · · · · · · · · · Bimorph converter, 4 · · · · · · · · · · · · ·
· · · · · · · It is an effect diaphragm.
DETAILED DESCRIPTION OF THE INVENTION The present invention is an earphone
characterized in that a plurality of piezoelectric diaphragms having a piezoelectric longitudinal
effect are vertically arranged. The nine earphones using the conventional piezoelectric element
are mainly of the structure shown in FIG. These attempt to obtain a certain sound pressure from
the small amplitude of the piezoelectric transducer by transmitting the vibration of the bimorph
transducer to the diaphragm. The disadvantage of such a structure is that the amplitude of the
vibration of the piezoelectric transducer is small, so to obtain a sound pressure as large as
comparative ") -1-no /, 5 / ==-/ '/. One is the thick surface area diaphragm, and the diameter of
the earphone itself must be increased. If a high sound pressure is to be obtained, the diameter of
the earphone will be large, and it will not be possible to distort an unnatural feeling of wearing.
The present invention compensates for the shortcomings of conventional earphones using a
piezoelectric element, and utilizes the features of a piezoelectric plate that is low in cost and high
in efficiency, so it can be driven with extremely low power and has good sound quality. It is an
earphone that meets the optimal conditions for use. In the present invention, the area to be
vibrated is increased by using a plurality of piezoelectric vibrating plates having a piezoelectric
longitudinal effect in which the d field and the displacement have the same direction, without
using the vibrating plate in particular except the piezoelectric vibrating plate. . FIG. 2 shows an
example of the shape of the piezoelectric diaphragm used in the present invention. The
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piezoelectric diaphragm is provided with electrodes on both sides, and when an alternating
voltage is applied to the electrodes, displacement occurs in the thickness direction, and two or
more sheets can be stacked. The fourth time, FIG. 5 is a cross-sectional view showing an example
of the arrangement of the piezoelectric diaphragm. No. 2-1883 In particular, although the
arrangement is not limited to the example shown in FIGS. 4 and 5, the diaphragm of the
conventional earphone determined by the inner diameter of the earphone from K if it is arranged
plurally vertically In the small volume, a large diaphragm area can be secured compared to the
area of. Further, due to its structure, by not using a surface diaphragm as in the prior art, it is
possible to take advantage of the frequency characteristics extended to high frequencies unique
to the piezoelectric element. FIG. 5 shows a cross-sectional view of an application example based
on the method of arranging piezoelectric elements shown in FIG.
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