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Patent application Showa / = / 'year / J-Jun-2.7 3, n, 11 Applicants ■ JP 50-983 140 published
Japan 50. (1975) s, 5 ■ 持-3/2 2 agency number serial number 7321 f specification l invention
Electrolytic microphone
3. Detailed Description of the Invention The present invention relates to an electrolytic
microphone and is characterized in that sound is converted to an electrical output by using a
change in ion concentration accompanying a pressure change of an electrolyte. It is said that.
That is, the electrolytic microphone according to the present invention encloses the inside of the
closed container having a thin film stretched on the front and the electrolytic solution, and
extracts the change in the current flowing between the pair of electrodes in the electrolytic
solution as an output. When the electrolyte in the closed container is subjected to pressure
fluctuation due to vibration of the thin film due to sound waves in air or water, the change in ion
concentration of the electrolyte accompanied by the pressure change is caused between the
electrodes in the electrolyte. It is summed up to be output as the change of the current of.
Therefore, according to the microphone of the present invention, there is no influence of the
property of the external air, that is, the temperature, humidity, etc. in relation to the use of the
liquid enclosed in the closed container. Because the distance between the two plates is narrow,
the electrical characteristics between the two plates change with humidity, and the moisture and
foreign matter in the air adhere to the plates and the temperature changes the air resistance. B, f
f, Lm and so on. However, the microphone of the present invention is not affected by them, and it
is%: 11! It can be used. Further, in the electrolytic solution used in the present invention,
EndPage: 1 on is transmitted very rapidly and the dissociation of ions by pressure is also very
fast, so that sufficient frequency response characteristics can be secured. And, in the
conventional microphone party phone, it is difficult to follow up to a high frequency because the
movable part which receives air vibration is relatively large, but in the present invention, it is
necessary to use a very thin film in the part which receives the vibration. Since it is possible, the
mass of the movable part can be reduced, and responsiveness to high frequencies can be easily
obtained. In addition, since the electrolytic solution in the present invention also has the
characteristics of a piezoelectric element in ultrasonic waves, it has the advantage of being able
to sufficiently cover in principle the low frequency close to 0 cycles to the ultrasonic region or
more. In the embodiment of the present invention shown in the drawings, referring to FIG. 7
(wherein, the microphone body 1 encloses the electrolyte 4 in the closed container 2 in which
the thin film 3 is stretched on the front surface) Then, an electrode 5 # 5 of the above-mentioned
microphone body is connected to one end of the wheel stop ridge 7 connected to the power
source 6 by forming a pair of electrodes 5t5 in the electrolyte solution 4 in a pair. A minute
resistance change of the electrolyte between the electrodes is output via the amplifier 8.
The figure shows the case where the above output is displayed on the Braun tube 9. According to
such an electrolytic microphone, when a sound wave vibrates the thin film 3 in the air or in
water, the internal electrolyte receives a minute pressure fluctuation due to the vibration, and the
ionization of the electrolyte is promoted according to the fluctuation pressure. Because the
resistance between the electrodes 5 and 5 changes slightly because the ion concentration
changes or is suppressed, the current flow between the electrodes is amplified by the Easton
bridge 7 and the amplifier 8. Thus, the sound wave can be output as an electric signal. Dew! 2
shows another embodiment, which is formed in FIG. t), the same figure φ) Company, Inc. 5 and 5
are connected by a resistive resistance in the form of a pile, and a configuration is shown in
which the current flowing between the electrodes changes as a whole by the change of the ion
concentration of the electrolyte. There is. Furthermore, in the case shown in FIG. 1C, when the
electrolytic solution is affected by the temperature, the heater 1 for keeping the temperature
constant is disposed in the electrolytic solution. In order to stabilize the change in the ion
concentration of the electrolyte, an electric field or a magnetic field may be applied between the
electrodes. As described in detail above, according to the present invention, it is possible to easily
form a microphone by using the change in ion concentration accompanying the change in
pressure of the electrolyte O. ( (−
It is sectional drawing which shows each different Example of the simple description body of a
French drawing. L, ,, microphone body, 2. ・ ・ A closed container, 301. Thin film, 490.
Electrolyte, 510. electrode. Designated Agent General Manager, Institute of Industrial
Technology, Institute of Machinery Technology "-",-"EndPage: 2