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DESCRIPTION JPH07123490

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DESCRIPTION JPH07123490
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
bone conduction microphone provided with a case, a diaphragm to which a piezoelectric element
is attached and attached to the case, and an impedance conversion circuit disposed in the case.
[0002]
In a bone conduction microphone provided with a case, a diaphragm attached with a
piezoelectric element and attached to the case, and an impedance conversion circuit disposed in
the case, one end is generally an impedance conversion circuit. Electrical signals generated in the
piezoelectric element are transmitted from the microphone by means of an output cord
connected and extending through the case and out of the case.
[0003]
SUMMARY OF THE INVENTION In the conventional bone conduction microphone, the output
cord vibrates when the hair or a part of the clothes comes in contact with the output cord, and
the vibration is connected to one end of the output cord. There is a problem that noise is mixed
in the electric signal generated in the piezoelectric element, which is transmitted to the vibration
plate and hence to the piezoelectric element via the impedance conversion circuit, more
specifically, the circuit board on which the impedance conversion circuit is formed.
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1
The present invention has been made in view of the above problems, and a bone conduction
microphone comprising a case, a diaphragm to which a piezoelectric element is attached and
attached to the case, and an impedance conversion circuit disposed in the case. It is an object of
the present invention to provide a bone conduction microphone configured so that the vibration
of the output code transmitted from the microphone to the electric signal generated in the
piezoelectric element is not transmitted to the diaphragm.
[0004]
[Means for Solving the Problems] In order to solve the above problems, in the present invention,
a case, a diaphragm to which a piezoelectric element is attached and attached to the case, and an
impedance conversion circuit disposed in the case And a bone conduction microphone
characterized by being connected to an output cord through an elastic body. In a preferred
embodiment of the present invention, the impedance conversion circuit is connected to the
output cord through a conductive elastic body, and the conductive elastic body is disposed in a
through hole formed in the case and is an insulating elastic body. It is fixed to the case through.
In another preferred embodiment of the present invention, the lead wire connected to the
impedance conversion circuit and the output cord are connected via two isotropic conductive
elastic bodies separated from each other by an insulating elastic body. There is. In still another
preferred embodiment of the present invention, the lead connected to the impedance conversion
circuit and the output cord are connected via one anisotropic conductive elastic body. In another
preferred aspect of the present invention, the printed wiring of the circuit board on which the
impedance conversion circuit is formed and the output cord are connected via one anisotropic
conductive elastic body.
[0005]
In the present invention, since the bone conduction microphone is connected to the output cord
through the elastic body, the vibration generated in the output cord is absorbed by the elastic
body and is not transmitted to the diaphragm.
[0006]
A first embodiment of the present invention will be described with reference to FIGS. 1 and 2.
FIG.
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2
As shown in FIG. 1, the bone conduction microphone according to the present embodiment
comprises a case 1 constituted by a cylindrical body 1a and a back cover 1b closing one end of
the cylindrical body 1a, and an opening of the cylindrical body 1a. The diaphragm 2 whose
periphery is fixed to the inner surface, the vibration transmission member 3 fixed to the outer
surface of the diaphragm 2, the piezoelectric element 4 adhered to the inner surface of the
diaphragm 2, the diaphragm 2 and the back cover The circuit board 5 is provided between the
circuit board 1b and the circuit board 5 whose peripheral edge is fixed to the inner surface of the
cylindrical body 1a. The circuit component 5 for impedance conversion is attached to the circuit
board 5. A through hole 1 c is formed in the case 1. As shown in FIG. 2, in the through hole 1c, a
holder 7 made of insulating rubber is fitted, and in the holder 7, two isotropic conductive
members separated from each other by the insulating rubber plate 8 The rubber plates 9a and
9b are accommodated. The terminals 11 a and 11 b are attached to the end of the conducting
wire 10 extending from the impedance conversion circuit component 6, and the terminals 13 a
and 13 b are attached to the end of the output cord 12. The terminal 11a is held between one
end face of the conductive rubber plate 9a and the holder 7, and the terminal 13a is held
between the other end face of the conductive rubber plate 9a and the holder 7. Similarly, the
terminal 11b is held between one end face of the conductive rubber plate 9b and the holder 7,
and the terminal 13b is held between the other end face of the conductive rubber plate 9b and
the holder 7.
[0007]
In the bone conduction microphone having the above configuration, the voice vibration
transmitted from the oral cavity to the skull is transmitted to the vibration transmitting member
3 in contact with the temporal region behind the ear, etc., and further from the vibration
transmitting member 3 to the diaphragm 2 The piezoelectric element 4 is transmitted and
vibrated, and the sound vibration is converted into an electric signal. The electric signal
generated by the vibration of the piezoelectric element 4 passes through the impedance
conversion circuit formed by the component 6, and then the lead 10 and the output cord 12
connected to the lead 10 through the conductive rubber plates 9a and 9b Output from the bone
conduction microphone. Since the output cord 12 is connected to the conducting wire 10
through the conductive rubber plates 9a and 9b, the vibration of the output cord 12 is absorbed
by the conductive rubber plates 9a and 9b, and the impedance conversion circuit component 6
Specifically, it is not transmitted to the circuit board 5 to which the component 6 for impedance
conversion circuit is attached. Further, since the connecting portion between the lead 10 and the
output cord 12 is surrounded by the holder 7 made of rubber, the vibration of the output cord
12 is absorbed by the holder 7 made of rubber and is not transmitted to the case 1. Therefore, in
the present bone conduction microphone, there is no possibility that noise may be mixed in the
electric signal generated in the piezoelectric element 4 due to the vibration of the output cord 12.
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[0008]
A second embodiment of the present invention will be described based on FIG. As shown in FIG.
3, in the bone conduction microphone according to the present embodiment, an anisotropic
conductive rubber plate 109 is accommodated in the through hole 1 c of the case 1. The
terminals 111a and 111b attached to the end of the conducting wire 110 extending from the
impedance conversion circuit component are attached to one end of the rubber plate 109, and
the terminals 113a and 113b attached to the end of the output cord 112 are terminals
respectively It is stuck on the other end of the rubber plate 109 facing the members 111a and
111b. The rubber plate 109, the terminals 111a and 111b, and the terminals 113a and 113b are
covered with the insulating rubber 107 filled in the through holes 1c, and fixed to the case 1 by
the insulating rubber 107. Except for the above, the configuration of this embodiment is the
same as that of the first embodiment. In this embodiment, since the anisotropic conductive
rubber plate 109 has conductivity only in the direction from the terminals 111a and 111b to the
terminals 113a and 113b, the conductive conductive plate is used with the conductive wire 110
using a single conductive rubber plate. An output code 112 can be connected. Also in this
embodiment, since the output cord 112 is connected to the conducting wire 110 through the
conductive rubber plate 109, the vibration of the output cord 112 is absorbed by the conductive
rubber plate 109, and a component for impedance conversion circuit, More specifically, it is not
transmitted to the circuit board to which the component for impedance conversion circuit is
attached. Further, since the connecting portion between the conducting wire 110 and the output
cord 112 is covered with the insulating rubber 107, the vibration of the output cord 112 is
absorbed by the insulating rubber 107 and is not transmitted to the case 1. Therefore, there is no
possibility that noise may be mixed in the electric signal generated in the piezoelectric element
due to the vibration of the output code 112.
[0009]
A third embodiment of the present invention will be described based on FIG. In the bone
conduction microphone according to the present embodiment, as shown in FIG. 4, a holder 207
made of insulating rubber is fitted in the through hole 1c of the case 1, and in the holder 207,
anisotropic conductive is conducted. A rubber plate 209 is housed. The rubber plate 209 and the
holder 207 are in a state in which one end of the circuit board 205 on which the circuit
component for impedance conversion 206 is mounted extends into the holder 207 and the
printed wiring 205a and 205b of the circuit board 205 is in contact with one end of the rubber
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4
plate 209. It is held by and. The terminals 213a and 213b attached to the end of the output cord
212 extend into the holder 207, respectively face the printed wiring 205a and 205b to abut the
other end of the rubber plate 209, and are held by the rubber plate 209 and the holder 207 It is
done. In this embodiment, since the anisotropic conductive rubber plate 209 has conductivity
only in the direction from the printed wiring 205a, 205b of the substrate 205 to the terminals
213a, 213b of the output cord, a single conductive rubber plate is used. The board can be used
to connect the printed wiring of the substrate 205 and the output cord 212. Also in this
embodiment, since the output code 212 is connected to the printed wiring 205a and 205b of the
substrate 205 via the conductive rubber plate 209, the vibration of the output code 212 is
absorbed by the conductive rubber plate 209, It is not transmitted to the circuit board 205. In
addition, since the connection portion between the printed wiring 205a and 205b of the
substrate 205 and the output cord 212 is surrounded by the holder 207 made of insulating
rubber, the vibration of the output cord 212 is absorbed by the holder 207 and transmitted to
the case 1 I will not. Therefore, there is no possibility that noise may be mixed in the electric
signal generated in the piezoelectric element due to the vibration of the output code 212.
[0010]
A fourth embodiment of the present invention will be described based on FIG. In the bone
conduction microphone according to the present embodiment, as shown in FIG. 5, a holder 307
made of insulating rubber is fitted in the through hole 1 c of the case 1, and anisotropic
conductive in the holder 307. A rubber plate 309 is housed. One end of the substrate 305 on
which the impedance conversion circuit component 306 is mounted extends into the holder 307,
and the printed wiring 305a and 305b of the substrate 305 is held by the holder 307 in a state
of being in contact with one end of the rubber plate 309. Terminals 313a and 313b attached to
the end of the output cord 312 are attached to the other end of the rubber plate 309 so as to
face the printed wiring 305a and 305b. Also in the present embodiment, the same operation and
effect as in the third embodiment can be obtained.
[0011]
As described above, in the present invention, since the bone conduction microphone is connected
to the output cord through the elastic body, the vibration of the output cord is absorbed by the
elastic body and is not transmitted to the diaphragm. Therefore, there is no possibility that noise
may be mixed in the electric signal generated in the piezoelectric element due to the vibration of
the output code.
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