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JPS5892200

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DESCRIPTION JPS5892200
[0001]
TECHNICAL FIELD OF THE INVENTION The present invention relates to transducers using
carbon particles. (Technical Background of the Invention) As a transducer of this type, for
example, a carbon microphone is well known. As shown in FIG. 1, this carbon microphone A fixes
a container 3 provided with a fixed electrode 1 on its bottom to the center lower part of a
mortar-shaped insulating frame 4 and loosely packs the carbon particles 5 in the container 3 A
structure in which the carbon particle 5 is covered with the movable electrode 6 and the
diaphragm 7 is stretched in a bowl-like inclination direction of the movable electrode 6 and the
upper end of the frame 4 and the front surface of the frame 4 is covered with the protective WIA
8 and the protector 9 have. Reference numeral 10 denotes a blue air chamber provided on the
back of the frame 4 to form a vibration space. As shown in FIG. 2, this carbon microphone A
applies a DC voltage from the power source battery E through the frequency adjustment resistor
RIN capacitor C and the primary winding T1 of the transformer T, and the container 3 is vibrated
by the vibration of the vibrating film 7. The current corresponding to the change in the contact
resistance between the carbon particles 5 packed in the circuit is taken out, and the output is
taken out from the secondary winding T2 of the transformer T. However, although the carbon
microphone A using the carbon particles 5 has an advantage that the impression is extremely
high, it has a drawback that the contact resistance value is largely changed depending on the
humidity. In addition, there are many noises due to the contact between carbon particles, and
furthermore, the container 3 for packing carbon particles is required, the shape of the container
is restricted, the freedom of design is narrow, and the work of packing carbon i is complicated
and expensive There is a drawback that SUMMARY OF THE INVENTION The present invention
has been made to solve such a drawback, and provides stable characteristics against changes in
the environment such as humidity, and provides a transducer with a large degree of freedom in
design without any restriction on the shape. To aim. SUMMARY OF THE INVENTION In order to
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achieve the object described above, the present invention applies a voltage to a diaphragm
formed by mixing carbon particles in a synthetic resin having elasticity, and changes the
resistance value of the diaphragm due to the expansion and contraction of the diaphragm. The
electric signal flowing through the diaphragm is changed through. The invention will now be
described in detail with reference to the drawings. FIG. 3 is a cross-sectional view showing an
embodiment of the transducer of the present invention, showing an example applied to a
microphone. A conductive vibrating electrode 12 is stretched at the open end of the cylindrical
insulating bottomed case 11 constituting the main body of the microphone, and the edge of the
vibrating electrode 12 forms an external electrode 13. The tip of a coil spring-like conductive
elastic body 15 whose one end is fixed to the external electrode 14 provided at the bottom of the
case 11 is fixed at substantially the center of the vibrating electrode plate 12.
The conductive elastic body 15 in the form of a coil spring is made of silicon rubber mixed with
carbon particles i and formed into a spiral shape, and is fixed between the vibrating electrode 12
and the external electrode 14 to form the vibrating electrode 12. Can be elastically vibrated by
the vibration of. Further, a protector 16 is placed on the open end of the case 11 so as to cover
the diaphragm 12. The protector 16 is provided with a plurality of holes 17 as sound paths
through which sound waves from the outside pass. A condenser microphone unit 18 is attached
to the center tip of the protector 16. This condenser microphone unit 18 is, for example, a
conventionally known torque having a thin film diaphragm on which a metal film is vapordeposited on the front surface of a fixed electrode formed of an electret base molecular dielectric
material formed on a conductive electrode. It consists of a tret condenser type microphone unit,
and an impedance conversion circuit is built in if necessary. In the microphone shown in FIG. 3, a
transducer is formed by the vibrating electrode 12 and the conductive elastic body 15. For
example, as shown in FIG. 4, the external electrode 13 is connected to the DC power source
battery via the impedance variable resistance R2. The external electrode 14 is connected to the
positive side of E and to the negative side of the power supply battery E from the midpoint P of
the primary side winding T1 of the input / output quadrant T. The other end of the condenser
microphone unit 18 whose one end is grounded is used by connecting the primary winding of
the transformer T to the negative side of the power supply battery 4F via T1. Reference numerals
20 and 21 denote an output of a secondary winding T2 of the transformer T. Next, the operation
of the microphone configured as described above will be described. When the microphone
protector 16 is directed to a sound source (not shown), the sound wave from the sound source
drives the condenser microphone unit 18 disposed on the front of the protector 16 and outputs
an audio current to the primary winding T + of the transformer T. Further, sound waves from the
sound source pass through the holes 17 of the protector 16 and enter the case 11 to vibrate the
vibrating electrode 12. When the vibrating electrode plate 12 vibrates, the coiled spring-like
conductive elastic body 15 whose one end is fixed to the external electrode 14 expands and
contracts. The conductive elastic body 15 is made of silicon rubber mixed with carbon particles,
so that the elastic property is good, and the resistance value between both ends of the conductive
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elastic body 15 changes according to the expansion and contraction, and the external electrode
13 The current flowing between 14 changes according to the sound wave. As a result, in the
primary winding ? T + of the transformer T, an audio current passing through the external
electrode 13.14 darkness also flows.
Moreover, the audio current flows through the primary winding of the transformer T as a
reverberation signal delayed in time as compared with the condenser microphone unit 18 due to
the reverberation due to the expansion and contraction of the conductive elastic body 15. In the
transformer T, the voice current from the condenser microphone unit 18 and the voice signal
from the vibrating electrode 12 and the conductive elastic body 15 are superimposed and flow
on the primary spring line T +, and on the secondary side, a composite signal of respective voice
signals, That is, an audio signal including reverberation is controlled from the output terminal
20.21. FIG. 5 is a characteristic curve diagram showing a change in resistance value when the
conductive elastic body 15 is stretched and stretched under tension. As apparent from the figure,
the resistance value against the elongation of the conductive elastic body 15 linearly changes in a
range where the elongation is small, but when it exceeds a certain elongation, the change in the
resistance value becomes slow and the saturation It becomes a state. Therefore, in the present
invention, when the conductive elastic body is used in a region where the change in resistance
value with respect to the elongation of the conductive elastic body 15 is linear, the output
current to the input has a waveform without distortion in proportion to the acoustic wave. It is
desirable to use in this range. In the above-described embodiment, the conductive elastic body 15
is formed by mixing carbon particles with silicon rubber. However, it is also possible to mix
carbon particles in a synthetic resin having good elasticity. And, if there is much contamination
of carbon particles, the change in resistance value will be large and the loss will be small, but the
elasticity will be inferior, the mechanical strength will also deteriorate and the sensitivity to
sound waves will be lowered. On the other hand, if the degree of inclusion of carbon particles is
reduced, the elasticity will be good, but the change in resistance is small and the output of voice
current is reduced, so it is good to mix 50% or more of carbon particles. It is. Furthermore, in the
transducer of the present invention, the conductive elastic body 15 itself can be used as a
diaphragm, and its shape and size can be arbitrarily shaped according to the purpose. The
transducers of the present invention described above are applicable not only to microphones but
also to various electronic devices that convert mechanical changes such as pickups and sensors
into electrical signals. As described in detail in the invention, the transducer according to the
present invention uses a diaphragm in which carbon particles are mixed with a synthetic resin
having good elasticity, and mechanical changes through the change in resistance value due to the
expansion and contraction of the diaphragm. As it is converted into electrical vibration, it has
strong and stable characteristics against environmental changes such as humidity, as compared
with conventional transducers using carbon particles, and because molding is extremely easy and
easy, The structure is simple and the freedom of installation B1 is greatly expanded.
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Moreover, since the structure is simple, price reduction can be achieved.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a longitudinal sectional view showing a conventional carbon microphone, FIG. 2 is a
circuit diagram using the carbon microphone of FIG. 1, FIG. 3 is a longitudinal sectional view
showing a microphone using a transducer of the present invention, The figure is a circuit
diagram using the microphone shown in FIG.
FIG. 5 is a characteristic curve diagram of the transducer of the present invention. 11
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Vibrating electrode plate (conductive
elastic body) 16 иииииииии Protector 17 ииииииииииииииииииииииииииииииии condenser microphone unit R2 иииииииии variable
resistor E ииииииииииии DC power supply battery ? ииииииииииии trans Attorney Attorney mandatory Yamasa-
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