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JPH0654387

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DESCRIPTION JPH0654387
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
portable microphone, and more particularly to a bone-conduction microphone capable of picking
up only the voice emitted by the portable person without being affected by the surrounding noise
to enhance the speech quality.
[0002]
2. Description of the Related Art When it is necessary to make a telephone call using a
microphone in the vicinity of a noise source such as an airport, a car race ground, a concert hall,
an engine room such as a ship, a construction site, etc. A noise tolerant microphone is used which
picks up only the voice of the user. As such noise resistant microphones, in addition to sound
pressure type close-talking microphones, there are bone conduction microphones such as
vibration type throat microphones, otomic microphones or nasal bone microphones.
[0003]
The sound pressure type microphone is a microphone that directly picks up the sound pressure
emitted from the mouth at the time of vocalization, and the bone conduction microphones such
as the throat microphone, the otobone microphone, and the nose bone microphone The vibration
is directly picked up and converted into an electrical signal.
01-05-2019
1
[0004]
However, while the sound pressure type microphone is used while being held away from the
user's mouth, it is common to use a sound pressure type transducer having an impedance
relatively close to the acoustic impedance of air, so external noise It is difficult to identify the
voice for the listener who is the other party of the call.
In addition, the bone conduction microphone is easy to pick up contact broadband noise caused
by friction with the body part to which the microphone is attached, etc. when the wearer moves
the head and other bodies, and the S / N ratio decreases. There was a defect that
[0005]
In addition, when a wireless communication device or the like using such a microphone and
having a transmission / reception automatic switching function is used under high noise, it has a
defect that the automatic switching function is prone to malfunction.
[0006]
From such a point of view, the present inventor in Japanese Patent Application No. 61-155470
has fixedly attached a vibration sensitive transducer having high acoustic impedance to a sound
receiving plate having an appropriate hardness, thereby sounding the outside of the living body
serving as a voice utterance source. We have proposed a noise tolerant microphone that converts
the vibration propagating through the bones of the living body into an electrical signal without
substantially detecting the noise propagating.
According to this noise resistant microphone, it is not sensitive to vibration propagating through
the air, and hence noise is eliminated and clear when applied to a wireless communication device
used under high noise (for example, 120 dB or more). It is possible to make a call by voice.
[0007]
However, since the throat microphone shown in the above patent application is used by pressing
the sound receiving block against the pharyngeal bone by winding it around the neck of the user
by using a belt attached with a sound receiving plate to which the transducer is fixed, Also, the
blood vessels were compressed, resulting in discomfort, discomfort, and inability to withstand
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2
long-term use.
[0008]
SUMMARY OF THE INVENTION The present invention has been made to eliminate the abovementioned conventional drawbacks, and in a bone conduction microphone using a vibration
sensitive transducer with high acoustic impedance, the user's helmet, headphones, etc., a
microphone holder. It is an object of the present invention to provide a bone conduction
microphone in which the discomfort due to the tightening of the neck is eliminated by using the
microphone body pressed against the pharyngeal bone or the like only during a call.
[0009]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
substantially detects noise propagating as sound waves outside the body by closely fixing a
vibration-sensitive transducer to a sound receiving plate having an appropriate hardness. In the
bone conduction microphone for electrically converting the vibration propagating through the
bone constituting the living body, a microphone body for housing a transducer fixed on one
surface of the sound receiving plate, and the microphone body extending from the microphone
body A microphone holder for suspending the main body from a helmet or the like, wherein the
microphone main body houses and seals the transducer in an elastic case and the other surface
of the sound receiving plate forms a part of the outer wall of the case It is what was constructed.
[0010]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be
described in detail based on the embodiments shown in the drawings.
[0011]
FIG. 1 is a perspective view showing an embodiment of a bone conduction microphone according
to the present invention, and FIGS. 2 (a) and 2 (b) are cross-sectional views of the microphone
main body, respectively.
[0012]
This bone conduction microphone comprises a microphone main body 1 and a microphone
holder 2 for holding the microphone main body 1, and is used by being suspended from a holder
such as a helmet worn by the wearer on the head, headphones and the like.
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[0013]
The microphone body 1 is a vibration sensitive transducer (e.g., a piezoelectric element) fixed
closely to one surface of the sound receiving plate 4 having an appropriate hardness and shape
inside the hollow case 2 of rubber or resin which is easily elastically deformable. The
acceleration sensor 5 is housed in a sealed manner, and the other surface of the sound receiving
plate 4 forms a part of the outer wall of the case 2.
[0014]
Of the full length of the microphone holder 6 extending from the microphone body 1, a portion
6a corresponding to about half the length connected to the microphone body 1 is a tube of
rubber or the like which is flexibly deformed and connected to headphones or the like not shown.
The other half 6b is obtained by inserting a relatively rigid pipe such as metal into the inside of a
rubber tube, and an external screw 7 for fixing one end of the microphone holder 6 to the
headphone etc. is attached to the tip of the rigid pipe. It is provided.
[0015]
The tab-like projection 8 extending from the outer wall of the case 2 of the microphone body 1 is
a "knob" when the microphone is used, and this portion is gripped with a finger to press the
sound receiving plate 4 against the jaw or the bone portion of the throat. It is provided as a
convenience.
[0016]
By the way, a transducer of the above-mentioned type has an acoustic impedance which is
extremely large (about 10 6 times) as large as that of air, and is hardly affected by noise
propagating through air as a medium, and also accommodates this transducer. The case 2 also
has a sound absorbing effect, and a part of the microphone holder 6 connecting the case 2
(microphone main body) to the helmet etc. is also a flexible tube, so even if any impact is applied
to the helmet etc, this is the transducer. There is no signal to vibrate 5.
[0017]
By the way, the transducer 5 converts the picked up vibration into an electric signal, and this
electric signal is output to a transmission circuit mounted on a helmet or the like through a lead
wire passing through the microphone holder 6, but the transducer 5 is always energized. If the
microphone main body 1 suspended from the helmet or the like swings during non-calling, noise
is transmitted from the transmitting circuit to the receiving side as a result of colliding or
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rubbing against the human body or a fixed object in the vicinity thereof. There is a problem.
As a method for solving such a problem, it is effective to insert a voice switch in the transmission
circuit and pick up and transmit only the voice uttered by the user.
[0018]
Further, it is preferable to configure this microphone in a press-to-talk type in order to transmit
the signal emitted by the transducer 5 only at the time of call and to further ensure the
transmission of noise at the time of non-call.
[0019]
That is, FIG. 3 is an external view showing a second embodiment of the bone conduction
microphone according to the present invention, FIG. 4 is an explanatory view of an internal
configuration of an elastic case in a state where the sound receiving plate 4 is removed together
with the transducer 5, FIG. FIG. 5 is a cross-sectional view taken along the line A-A of FIG. 4, in
which a micro switch 9 is housed in addition to a vibration sensitive transducer 5 using a
piezoelectric element inside a hollow elastic case 2 constituting the microphone body 1; The
micro switch 9 is turned on by pressing the button 10 provided at the time of using this
microphone, and the signal emitted from the transducer 5 is transmitted to the transmission
system (not shown).
[0020]
The button 10 is inserted into the outer wall of the elastic hollow case 2 to push the contact
point of the micro switch 9 and embedded in the outer wall of the case 2 using rubber elasticity
of the case 2 to release the pressure on the pin. It may be returned to (position of micro switch
OFF).
[0021]
The bone conduction microphone having the configuration as described above is very effective
when applied to, for example, a pharyngeal microphone.
In this case, the base end of the microphone holder 6 is suspended by a holder such as a helmet
or a headphone by means of screwing, etc., and the knob 8 is pinched with a fingertip only at the
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time of a call to lightly acrylic plate to the side of the pharyngeal ridge It is sufficient to make a
call by pressing the sound receiving board 4 such as.
It goes without saying that when using the microphone shown in the second embodiment having
the switch, the user speaks while the button 10 is turned on.
[0022]
In addition, it is possible to pick up voice using vibration of a bone other than the pharyngeal
bone, for example, the cheek or the jaw, using the microphone of the present application, in
which case the length of the microphone holder 6 It may be preset according to the contact site.
[0023]
Thus, the bone conduction microphone according to the present invention can be used by
pressing it against the pharyngeal bone or face by simply changing the length of the microphone
holder, and the sound receiving plate can always be used by winding it around the neck of the
user Since there is no pressure contact with the bone, it is possible to eliminate all the drawbacks
that the trachea and blood vessels are compressed, causing tightness and discomfort, and being
unable to withstand long-term use.
Also, it hardly responds to vibrations propagating through the air, thus eliminating noise and
applying clear speech when applied to a wireless communication device used under high noise
(for example, 120 dB or more). It will be possible to do.
[0024]
The above-mentioned transducer may be any type of vibration sensitive type having high
acoustic impedance, and the material of the sound receiving plate is not necessarily limited to
acrylic, and any material having high acoustic impedance can be used. May be used.
[0025]
As described above, according to the present invention, in a bone conduction microphone using a
vibration-sensitive transducer with high acoustic impedance, a holder, such as a helmet or
headphones of a user, worn on a human body or a narrow one. By suspending the microphone
part from the internal suitable place such as the axle and pressing the microphone part to the
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pharyngeal bone only at the time of a call, it is possible to eliminate the discomfort due to the
tightening of the neck and enable high-quality call under noise It has a remarkable effect on
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