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The name of the transmitter using the electret film, May 30, 1984, 六 ゲ ゲ 東 Tokyo, Musashino
City Midoricho 3-chome, 9-11, sosenno-no-tsunkenkieoujonai Nippon Telegraph and Telephone
Corporation Musashino Telecommunications Research Laboratories Maruya Yoshiro Marutani
Yoshibe 3 Patent applicant ■ Japan Patent Office ■ JP-A-51-14071. (1976) 12.3 Examination
Requested (All 4 Pages) Office Internal Number? Sida 6 Tata specification 1; name of invention
elect (transmitter using lett 1; name of invention elect (transmitter using lett
2 Inventor
3. Detailed Description of the Invention The present invention is intended to provide a smallsized transmitter having a good SIN ratio. The method of obtaining the sound propagating in the
air as electric output by electro-acoustic conversion has disadvantages such as high cost of the
converter and deterioration of S / NJllllJ due to external noise, and in order to avoid this defect, it
is necessary to It came to be devised a transmitter that takes out the change in capacity due to
elastic vibration of the body as electric vibration. Since this transmitter is a method of extracting
electric vibration as electric vibration before the sound becomes air vibration, the SZN ratio is
strong against external noise, but a battery is required to convert it into electric vibration, which
makes the location Because we need maintenance hand, such as changing from time to time, and
a number, we have not reached the stage that it is still useful in earnest in practical use. The
present invention 8A is intended to overcome the drawbacks of the conventional method, and
uses the charge of the electret film in place of the change of the dielectric constant at the stage
before the elastic wave generated from the sound source becomes airborne vibration. Since it is
taken out as an electric vibration, it is practically excellent because it does not require a place
and does not require a process such as replacement. The present invention will be described with
reference to the drawings. FIG. 1 is an explanatory view of the principle of the present invention,
in which 1 is an electret film, ε is an n '% m body with a dielectric constant of 6, and 4 and 5 are
both opposing electrodes. It shows a cross section. The dielectric e and the electric ky film 1 are
in contact with each other through the interface of the area S, and the electrode 5 made of a
conductor is one side EndPage: 1 on the opposite side to the surface of the film 1 in contact with
the dielectric ε. It is assumed that an electrode 4) K made of a conductor is provided on one side
not in contact with the film 1 of ε. Assuming that the two electrodes 4 and 5 are short-circuited
in direct current, charges on the surface of the nicret film 1 in contact with the electrode 5
appear as it is on the electrode 4 and therefore contact the film 1 with the surface in contact with
the dielectric constant COt & 4. A charge of the opposite sign of Fi is charged between the
surface and the surface. Assuming that the thickness of the dielectric ε is d, it is the capacitance
C: S / 4πε d (1). Therefore, the minute change 1h of the dielectric constant ε and the
capacitance change ΔC due to H are constant at t load Q of the quartet film Since the voltage
change .DELTA.V according to the capacity change equation か ら is 0 to VAC + C'8, it is possible
to obtain this by substituting this relation into (2). This (3) is a change value of the voltage
extracted from between both the lightning rods 4 and 5 when the dielectric constant (3) of the
insulating film 2 changes by ε. The present invention uses such a principle, and the embodiment
of the present invention will be described below. FIG. 2 shows an embodiment of the present
invention, and FIG. A face view, the same figure (b) is the cross-sectional view, and the same
figure (O) is the side view.
To explain the interrelationship of these figures in more detail, FIG. 2 (7 of the side views of one
embodiment of the present invention shown by → shows the microphone of the present
invention and 6 is derived therefrom Conductor pair, 8-arm spring 1.9 support frame, 10 is a
skin cross section, (Fig. 2 (=) and (R is a longitudinal cross-sectional view and cross-sectional view
of only the transmitter 7 portion of this) Hit. The broken lines YY 'of FIG. 2 (shown in FIG. 2 and
FIG. 2 ψ) are the edges of the microphone 7 which are wound around the transmitter 7 at the
broken line XX' in FIGS. 2 (a) and 2 (C). The result is shown in Figure 2 0). In FIG. 2 (a) and 2 (b),
1 is an electret film, 2 is an insulating film, 3 is an insulator, 4 is an external electrode, 5 is an
internal electrode, and the electret film 1 is adhered to the insulator 3 and fixed. I play a role. It is
desirable to attach a thin conductive film such as aluminum foil as much as possible on the
surface of the film 1 in contact with the electrode 5 so that the surface on the film 1 (→ surface
charge appears entirely on the electrode 4 side). Since the aluminum foil thus stretched is
integral with the electrode 5, the aluminum foil and the electrode 5 together constitute an
internal electrode. As clearly shown in FIG. 2 (C) and ((→), the insulating film 2 and the external
electrode 4 are in direct contact with the skin surface 10, and the insulating film 2 is thin. ε can
be viewed as the human body dielectric constant near the skin surface 10. When an elastic wave
emitted from the internal sound source reaches the skin surface 10 and vibrates the nicret film 1,
vibration occurs in human tissue near the skin surface 10, and the dielectric constant ε also
changes accordingly (3 Voltage fluctuation ΔK occurs between the external electrode 4 and the
internal electrode 5 in accordance with the equation shown in 2.). Since the contact of both
electrodes 4.5 is prevented by the insulator 3 and the insulating film 1, the voltage change
generated between the two electrodes 4 and 5 as in 00! 4V both 1! It is derived by means of the
conductor pairs 6 which are respectively derived from the poles 4 and 5. Therefore, if the current
signal derived from the wire pair is amplified by the high input impedance amplifier, the signal
emitted from the sound source in the body is amplified and taken out from the output terminal.
Moreover, since this signal is not affected by external noise during transmission, it can be used as
a transmitter resistant to external noise and having a good S / N ratio. Therefore, in addition to
the application of transmitting the voice by attaching this to the head, there is an excellent effect
of using it for the application of transmitting the heart sound in front of the fetus. It is a
disadvantage that the transmission is interrupted when the film 2 of this transmitter is separated
from the skin surface 10-this defect is prevented by removing part of the aluminum foil stuck
behind the film 1) Be done. That is, since the distance between the external electrode 4 and the
electret film 1 changes due to the vibration of the film 10 in this way, the elastic wave of the
arrowhead 4 sound source is sensed as a voltage change between the inner and outer electrodes
4 and 5 So the talk can be continued without interruption.
The third embodiment of the present invention is a longitudinal sectional view of another
embodiment of the present invention, in which the transmitter 7 is made in the shape of an
earplug, and corresponds to the longitudinal sectional view of the embodiment used together
with the handset. In the same figure, the film 1, the insulating film 2 and the internal electrode 5
are formed in a hollow cylindrical shape and are left behind and embedded in a ring around the
insulator 3. In addition, the outside is pole 4 ti so that the ring EndPage: 2 is inserted into the
shape of the ring, and is taken at the outlet of the outer ear wall 11. The conductor pair 6 led out
from both electrodes 4.5 is led out of the ear chamber 12 through the inside of the insulator 3.
Therefore, the signal current derived by this pair of leads 6 is amplified by the amplifier here,
and the source should transmit the signal from the sound source that has propagated to the
outer ear wall 11 to the destination. Can. Also, attach a small handset 13 to the outlet of the
insulator 3 shaped like an earplug, introduce an input signal current from the handset input
terminal 14 to the transmitter 13 and convert it into a sound wave, then in the center of the
insulator 3 As the tympanic membrane 15 is reached through the opened hole, the input signal
can be heard. As is apparent from the above description, the present invention can be made
compact and is resistant to external noise, and can not only transmit signals emitted by internal
sound sources, but also prevent interruption of transmission and use in combination with a
receiver. Because it can also be used as a transmitter in the future information age, it has
outstanding effects.
4. Brief description (c) of the drawings is a longitudinal sectional view, a transverse sectional
view and a side view of an embodiment of the present invention, and FIG. 3 is a longitudinal
sectional view of another embodiment of the present invention. 1 is an electret film, 2 is an
insulating film, 4 external electrodes, and 5 is an internal single pole. (8) Section i 畠 2 times P2
and C page EndPage: 35 list of attached documents α) 1 specification (2) 1 drawing (3)
application copy 1 (4) proxy 1 (5) ) Application examination request 1 on-EndPage: 4
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