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JP2006319933

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DESCRIPTION JP2006319933
PROBLEM TO BE SOLVED: A hands-free microphone using a coil and a capacitor has poor
responsiveness in high range, is susceptible to temperature and humidity, and tends to cause
howling. A piezoelectric element is in close contact with a vocal cord portion, and vocal cord
vibration is converted into voice, and covering the case except the contact surface with the vocal
cord portion with a case prevents a howling phenomenon and is less susceptible to temperature
and humidity and has a small mass. The use of a piezo element improves the response of high
frequency range, and improves the frequency characteristic by a bimorph-type vibrating element
of a full frequency nodal center support system equipped with a vibration control piece attached
to the periphery of the piezo element. It is a microphone to be characterized. [Selected figure]
Figure 1
Piezo vibrating microphone unit
[0001]
The present invention relates to a microphone unit that converts vocal cord vibration into
speech.
[0002]
Conventional hands-free microphones use coils and capacitors.
In the method using a coil, a diaphragm vibrated by sound waves is linked to the coil and the coil
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1
moves in the magnetic field to convert it into an audio signal. In the capacitor system, since the
distance between the metal plate and the diaphragm made of the metal thin film changes in
accordance with the vibration, the capacitance is changed to generate a potential difference. In
these conventional methods, it was easy to pick up external noise and to cause howling.
[0003]
However, according to the above-mentioned prior art, in the system using the coil, the coil having
a large mass is vibrated, the response of the high range is bad, and the condenser system is
susceptible to the influence of temperature and humidity. Moreover, it was easy to pick up
external noise and to cause howling.
[0004]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a microphone
which has good response, good frequency characteristics, is not susceptible to temperature and
humidity, and does not cause howling.
[0005]
In order to solve the above problems, the invention according to claim 1 attaches the microphone
to the throat of the vocal cords, converts the vocal cord vibration to voice, and covers the case
other than the wearing surface with a case to prevent the howling phenomenon, The mass is
reduced by using a piezo element that is not affected by humidity, and the frequency
characteristic is improved by a bimorph-type vibrating element of a full frequency nodal center
support system having a vibration control piece attached to the periphery of the piezo element It
is a microphone characterized by the above.
[0006]
By using a piezo element, the response can be improved more than a microphone using a large
mass coil, and it can be less susceptible to temperature and humidity than a condenser
microphone using a metal plate or a metal thin film.
[0007]
In addition, the microphone can be in contact with the vocal cords of the neck and the vibration
can be converted into sound, and the case can cover the area other than the contact area, and
since external noise is not picked up, howling hardly occurs.
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[0008]
The best mode for carrying out the invention will be described with reference to FIGS.
A microphone is attached around the neck like a headphone headband, and the vibration cover 2
is attached so as to be in close contact with the throat of the vocal cords.
The piezoelectric element 3 has a circular bimorph piezoelectric plate 7 supported by a central
shaft 5 for transmitting vocal cord vibration, and an annular vibration control piece 4 is attached
to the outer peripheral peripheral portion.
The resonance action is controlled by the vibration control piece 4 to obtain better frequency
characteristics.
The bimorph piezoelectric plate 7 is fixed by a stopper 6 so as not to come out. Vocal cord
vibration passes through the vibration cover 2 and is converted by the piezo element 3 into an
electrical signal to be converted into voice. Since the external noise is blocked by the case 1
except that the vibration cover 2 is in close contact with the vocal cord portion, howling does not
occur in the piezoelectric element 3. Piezoelectric ceramics that undergo a firing process in their
manufacture are resistant to changes in temperature and humidity, and since they do not use
coils, they have good responsiveness in the high frequency range.
[0009]
The present invention can be used as a mobile phone, a wireless transceiver, a loudspeaker, and a
microphone when riding on a motorcycle.
[0010]
It is a sectional view showing one embodiment of this invention.
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It is an outline drawing showing one embodiment of this invention.
Explanation of sign
[0011]
1 case 2 vibration cover 3 piezo element 4 vibration control piece 5 central axis 6 stop stopper 7
bimorph piezoelectric plate
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