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JPS5355113

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DESCRIPTION JPS5355113
Description 1, title of the invention
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3. Detailed Description of the Invention The present invention relates to a microphone having a
piezoelectric polymer film as a vibrating film, and to provide a microphone capable of greatly
reducing mechanical vibration noise added to the microphone while improving the sensitivity. It
is FIG. 1 shows a conventional microphone, in which 1 is a case having an open top, and a
microphone unit shown in FIG. 2 is attached to 9 openings of the case 1. Reference numeral 2
denotes a vibrating membrane made of a piezoelectric polymer film, and the vibrating membrane
2 is attached to a curved frame 3 of a rectangular frame along its curvature. Metal electrodes are
vapor-deposited on both surfaces of the vibrating film 2, and a voltage generated by the
application of the sound pressure P is generated between the electrodes. A metal is usually used
for the rectangular frame 3, and when the vibrating membrane 2 is attached to one surface of the
frame 3, conduction between the electrode on one side of the vibrating membrane 2 and the
frame 3 is achieved. Therefore, the output voltage is taken out from the frame 3 and the metal
electrode on the opposite side of the vibrating membrane 20. The vibration noise of the
conventional microphone configured in this way is generally in line with the surface density of
the vibrating membrane 2. Therefore, in order to reduce the vibration noise, the surface density
may be reduced. That is, although it is sufficient to make the vibrating film 2 thin, it can not be
made so thin because of the piezoelectric constant and strength of the piezoelectric polymer film,
and the vibration noise is thick. The present invention eliminates the above-mentioned
conventional drawbacks, and one embodiment of the present invention will be described below
with reference to FIGS. 3 and 4. In FIG. 3 and FIG. 4, the four-sided conductive case EndPage: 1 is
formed, and rectangular windows 5 and 5 'are formed on the opposite curved sides of the case 4,
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and the double-sided window 5 ░ is formed. A microphone unit is attached to each 5 '. Like the
prior art shown in FIG. 2, this microphone unit has vibrating films 2, 2 'made of a piezoelectric
polymer film on one surface of a curved rectangular frame 3.3' with the curvature of the frames
3, 3 '. It is stuck and constituted in the state where tension was given along. As shown in FIG. 4,
the vibrating membrane of each of the microphone units is polarized so that one vibrating
membrane 2 has 10 on the outer side and 10 on the inner side, and the other vibrating
membrane 2 'has positive on the outer side, It is polarized so that the inside is-. The positive
electrode of one diaphragm 2 and the one electrode of the other diaphragm 2 ? are electrically
connected to each other through the frame 3, the conductive case 4, and the frame 3. 6 is a lead
wire connected to one side electrode of the vibrating membrane 2 and 6 'is a lead wire connected
to the positive side electrode of the other vibrating membrane 2', as shown in FIG. When a sound
pressure of PO is applied, both vibrating membranes 2.2 'are compressed as shown by dotted
lines, and the tension of the vibrating membranes 2, 2' decreases.
Here, assuming that the output voltage of each vibrating membrane 2, 2 'when no sound
pressure is applied to the vibrating membrane 2, 2' is Eo, the vibrating membrane 2, 2 'is
compressed as shown by a dotted line in FIG. When the tension decreases, the output voltage of
each vibrating membrane 2, 2 'decreases by ?EpO. In the present invention, since the two
diaphragms 2 and 2 'are connected in series, the output is reduced by ?Epo + ?EpO = 2?EpO
between the lead wires 6 and 6'. Conversely, when -pOO sound pressure is applied, the output
increases by exactly 2?EpO. As described above, according to the microphone of the present
invention, twice the sensitivity can be obtained as compared with the prior art. According to the
present invention, mechanical vibration detection can be significantly reduced according to the
principle described below. The principle will be described below with reference to FIG. Now,
consider the case where mechanical vibration indicated by arrow F in FIG. 6 is applied. When F =
O, the output voltage is Eo, and when vibration of F = FO is applied from this state, the vibrating
membranes 2 and 2 'respectively show the original position according to the inertia rule 1) as
shown by dotted lines. The vibrating membrane 2 is stretched, and the vibrating membrane 2 'is
compressed. The output voltages of the diaphragms 2 and 2 'change by -.DELTA.EFO and +
.DELTA.EFO, respectively. In the present invention, since the vibrating membranes 2 and 2 'are
connected in series, the total output voltage generated when vibration is applied is -.DELTA.EFO +
.DELTA.EFI = 0 and the vibration noise is zero. In the above embodiment, as shown in FIG. 7 in
which the polarization directions of the vibrating membranes 2 and 2 'are shown in FIG. It is also
possible to connect the two vibration reports 2.2 'in series by connecting the positive electrode of
the vibrating membrane 2 and the vibrating one side electrode of the vibrating film 2 with the
lead wire 8 with 1's outer side being ten. As is apparent from the above embodiment, according
to one electronic phone of the present invention, the conventional microphone has an advantage
of being able to remove upper noise.
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4. Brief description of the drawings. FIG. 1 is a perspective view of a conventional microphone,
FIG. 2 is a perspective view of a microphone unit of the same microphone, FIG. 3 is a perspective
view of a microphone according to an embodiment of the present invention, FIG. 5 is a sectional
view of the same microphone, FIG. 5 and FIG. 6 are operation explanatory views of the same
microphone, and FIG. 7 is a view showing the arrangement of the microphone unit in another
embodiment of the present invention. 2.2 'и и и и и и и vibrating membrane, 313' и и и и и и и и и и и и и и и и и и и
и Case 5,5 'и и и и и и и и и и и windows 6,6' иииииииии Lead wire, 7 иииииии Sound absorption material, 8 иии Lead
wire. Name of agent Attorney Nakao et al. And one other person and EndPage: 2 Fig. 1 Fig. 2 Fig.
3 Fig. 4 EndPage: ?
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