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JP2017188759

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DESCRIPTION JP2017188759
Abstract: To prevent vibration noise from being picked up by a single vibration-electric converter.
SOLUTION: A bolt-clamped Langevin vibrator 20 is accommodated in the housing 10 via the first
elastic support means 29 with the polarization directions of the respective piezoelectric elements
21, 22 aligned with the axial direction of the housing 10, Is supported by the second elastic
support means 31 on the opening 10b side of the housing 10, and when attached to the throat,
the bolt-clamped Langevin vibrator 20 comprises the contact 30 and the bottom 10a of the
housing. The vibration generated at the throat is interposed as a compression force, and a
voltage corresponding to the magnitude of the compression force is output from the boltclamped Langevin vibrator 20 as an audio signal. [Selected figure] Figure 2
Throat microphone
[0001]
The present invention relates to a throat microphone that outputs vibration generated at a throat
of a human body as an audio signal, and more particularly, to a technology for preventing noise
generation due to externally applied vibration when not worn.
[0002]
When collecting voice with a microphone, under high noise where it is difficult to transmit with a
normal condenser microphone or dynamic microphone, for example, at a repair shop of an
aircraft or a construction site in a tunnel, etc., a throat microphone that detects vibration of the
throat Is used.
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[0003]
In the throat microphone, the vibration detection unit (pickup) uses a vibration-electric converter
including a piezoelectric element, and is pressed against the throat and used.
[0004]
In that case, in order to be able to transmit while both hands are free, it is often inconvenient to
use the hand-clamped method, so that the vibration detection unit uses a C-shaped neck band. Is
pressed against the throat (see Patent Document 1).
[0005]
However, since the vibration detection unit picks up any vibration due to its structure, for
example, when the throat microphone is attached or detached or when the vibration detection
unit is touched with a handle, unpleasant noise may be generated due to the vibration.
[0006]
Therefore, in Patent Document 2, an original vibration-electric converter that converts vibration
generated in the throat into an audio signal is added to a holding member such as a neck band
separately as a first vibration-electric converter. A second vibration-electric converter for
detecting mechanical vibration (noise source vibration) is provided, and a VOX circuit is
connected to the output stage of the first vibration-electric converter, and the output of the
second vibration-electric converter is used to output VOX. It has been proposed to control the
circuit so that the audio output level of the first vibrational-to-electrical converter is attenuated to
a predetermined or zero level off.
[0007]
According to this, the mechanical vibration applied to the neck band or the like by the tentacle at
the time of attachment / detachment of the throat microphone is detected as noise by the second
vibration-electric converter, the VOX circuit is controlled by the detection signal, and the first
vibration Since the sound output level of the electrical converter is attenuated to a predetermined
level or turned off at 0 level, noise generation due to externally applied vibration other than the
throat can be prevented.
[0008]
However, the throat microphone according to Patent Document 2 requires the second vibrationelectric converter and the VOX circuit for detecting vibration noise, separately from the original
first vibration-electric converter for detecting the vibration of the throat. Because of that, the cost
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increases.
[0009]
JP, 2005-117536, A JP, 2013-153364, A
[0010]
Therefore, it is an object of the present invention to eliminate the need for a vibration-electric
converter for vibration noise detection, a VOX circuit for audio signal output control, etc., and to
prevent a single vibration-electric converter from picking up vibration noise. It is to provide a
microphone.
[0011]
In order to solve the above problems, the present invention is a throat microphone having a
vibration-electric converter that is pressed against the throat through a holding member and
converts the vibration generated in the throat into an audio signal, the housing and two of them.
A bottomed cylindrical body including a bolted Langevin vibrator in which piezoelectric elements
are combined with their polarization directions facing each other, and a contact to the throat, and
the housing has an opening facing the bottom. The bolt-clamped Langevin vibrator is
accommodated in the housing via the first elastic supporting means with the polarization
direction of each piezoelectric element aligned with the axial direction of the housing, and the
contactor is And the second elastic support means is supported on the opening side of the
housing, and when not attached to the throat portion, the bolt tightening Langevin vibrator The
contactor is in a state where it can freely vibrate, and when attached to the throat, the bolted
Langevin vibrator is sandwiched between the contact and the bottom of the housing and the
vibration generated in the throat Is applied as a compressive force, and a voltage corresponding
to the magnitude of the compressive force is output from the bolt-clamped Langevin vibrator.
[0012]
In the present invention, it is preferable that a holding member for a human body is attached to
the housing.
[0013]
The bolt-clamped Langevin vibrator is mechanically coupled so that the two piezoelectric
elements face each other in the polarization direction, so even if it is vibrated, it does not
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generate power unless a compressive force is applied, and a compressive force is applied.
Generate electricity only when
By using such a bolt-clamped Langevin vibrator, the present invention eliminates the need for
anti-noise parts such as a vibration-electric converter for vibration noise detection and a VOX
circuit for audio signal output control, thereby making it possible to carry out vibration noise.
Vibrations occurring in the throat can be converted into audio signals without being generated.
[0014]
The schematic diagram shown in the state which attached the throat microphone which concerns
on one Embodiment of this invention to the neck band.
Sectional drawing which shows the (a) non-wearing state of the said throat microphone with
respect to the throat part of a human body, (b) Sectional drawing which shows a mounting state.
An exploded sectional view showing a bolting Langevin vibrator.
The disassembled perspective view which shows typically the principal part of the said bolt
tightening Langevin vibrator.
The perspective view which shows the elastic support means of the said bolt-fastening Langevin
vibrator | oscillator.
[0015]
Next, embodiments of the present invention will be described with reference to FIGS. 1 to 5, but
the present invention is not limited thereto.
[0016]
First, as shown in FIG. 1, the throat microphone 1 according to this embodiment is illustrated in a
state of being attached to one end of a neck band 2 as a holding member for a human body
having a substantially C shape and preferably having spring elasticity. Do not wear on the throat
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of the human body.
[0017]
The neck band 2 is made of a substantially C-shaped elastic wire (including a round bar and a
band plate) attached around the neck of a human body (not shown).
The material may be either metal or synthetic resin, but it is preferable that the material has a
nice touch since it touches the neck directly.
Note that, instead of the neck band, a microphone support arm of a headset may be used.
[0018]
Referring to FIGS. 2 and 3, this throat microphone 1 basically has a housing 10 and a boltclamped Langevin vibrator as a vibration-electric converter for converting vibration generated in
the throat portion into an audio signal. 20 and contacts 30 to the throat.
[0019]
The housing 10 is formed of a bottomed cylindrical body, and the surface facing the bottom
portion 10a is an opening surface 10b.
The housing 10 may be either a cylinder or a square cylinder.
Further, the material of the housing 10 may also be arbitrarily selected from metal, synthetic
resin, wood and the like.
[0020]
The first and second two piezoelectric elements 21 and 22, the first and second two metal blocks
23 and 24, and their respective members are integrally connected to the bolt-clamped Langevin
vibrator 20. Clamp bolt 25 is included.
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[0021]
Referring also to FIG. 4, the first piezoelectric element 21 and the second piezoelectric element
22 are formed in a disk shape having the same diameter and a predetermined same thickness.
The first piezoelectric element 21 and the second piezoelectric element 22 are polarized in the
thickness direction, but in the bolt-clamped Langevin vibrator 20, the polarization directions are
combined so as to face each other.
[0022]
In this embodiment, the positive electrodes face each other.
In the central portions of the first piezoelectric element 21 and the second piezoelectric element
22, bolt insertion holes 21a and 22a through which the tightening bolts 25 are inserted are
formed.
[0023]
A first electrode plate 26 as a positive electrode is sandwiched between the first piezoelectric
element 21 and the second piezoelectric element 22.
The first electrode plate 26 is formed of a disc having substantially the same diameter as the
piezoelectric elements 21 and 22, and is provided with a lead electrode 26b at a part of the
periphery thereof.
[0024]
The second electrode plate 27 as a negative electrode is disposed on the negative electrode
surface side (upper surface side in FIG. 3) of the first piezoelectric element 21, and the negative
electrode surface side of the second piezoelectric element 22 (lower surface side in FIG. 3) The
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third electrode plate 28 is disposed as a negative electrode.
[0025]
Similar to the first electrode plate 26, the second electrode plate 27 and the third electrode plate
28 are formed of a disc having substantially the same diameter as the piezoelectric elements 21
and 22, respectively. Is equipped.
[0026]
Bolt insertion holes 26a, 27a, 28a are formed in central portions of the electrode plates 26, 27,
28, respectively.
For each electrode plate 26, 27, 28, a copper electrode such as phosphor bronze or beryllium
bronze or a silver electrode is preferably employed.
Each electrode plate 26, 27, 28 may be smaller in diameter than the piezoelectric elements 21,
22.
[0027]
As shown in FIG. 4, the bolt-clamped Langevin vibrator 20 includes a pair of output terminals Ta
and Tb.
In this embodiment, the output terminal Ta is on the positive side and the output terminal Tb is
on the negative side, and the lead electrode 26b of the first electrode plate 26 is connected to the
positive output terminal Ta, and the negative side output terminal Tb is connected. The lead
electrodes 27b and 28b of the second electrode plate 27 and the third electrode plate 28 are
connected to each other.
Although only the first and second piezoelectric elements 21 and 22 are shown in FIG. 2 for the
sake of simplicity, the configuration of FIG. 4 is actually provided.
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[0028]
It is preferable that the first metal block 23 and the second metal block 24 be relatively soft
metal materials such as duralmin with small mechanical loss.
The first metal block 23 is disposed on the negative electrode surface side of the first
piezoelectric element 21, and the second metal block 24 is disposed on the negative electrode
surface side of the second piezoelectric element 21.
[0029]
The first metal block 23 is provided with a bolt insertion hole 23 a through which the tightening
bolt 25 is inserted.
The bolt insertion hole 23a is provided at its upper end side with an enlarged recess 23b in
which the head 25a of the tightening bolt 25 is accommodated.
[0030]
On the other hand, the second metal block 24 is provided with a female screw hole 24 a which is
a counterpart of the tightening bolt 25. The fastening bolt 25 is preferably a hard metal such as
stainless steel, and the fastening bolt 25 is inserted from the side of the first metal block 23 and
screwed into the female screw hole 24a of the second metal block 24 Thus, the bolted Langevin
vibrator 20 is manufactured. A hard synthetic resin block may be used instead of the metal
blocks 23 and 24.
[0031]
The bolt-clamped Langevin vibrator 20 is housed in the housing 10 via the first elastic support
means 29 made of a rubber material or the like, with the polarization directions of the
piezoelectric elements 21 and 22 aligned with the axial direction of the housing. There is.
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[0032]
In this embodiment, as shown in FIG. 5, the first elastic support means 29 has a pair of upper and
lower support members 29a, 29b annularly formed like a brim of a hat, and bolted Lange Bang
The vibrator 20 is supported by the support members 29a and 29b in a floating state in the
housing 10 from the bottom 10a.
[0033]
The contactor 30 is supported movably in the axial direction of the housing 10 on the side of the
opening surface 10b of the housing 10 via a second elastic support means 31 made of a rubber
material or the like.
The second elastic support means 31 may have the same shape as one of the support members
of the first elastic support means 29, for example, the upper support member 29a.
[0034]
As shown in FIG. 2A, the contactor 30 is supported by the second elastic support means 31 in a
non-contact state with the bolted Langevin vibrator 20 when not loaded and not loaded to the
throat as shown in FIG. Be done.
The contactor 30 may be either a metal material or a synthetic resin material, but preferably has
a small mass. The first and second elastic support means 29 and 31 may be formed, for example,
in the shape of a spoke of a wheel.
[0035]
As described above, since the first piezoelectric element 21 and the second piezoelectric element
22 face each other in the polarization direction as described above, the bolt-clamped Langevin
vibrator 20 is integrally coupled by the tightening bolt 25 so that the vibration is generated. Even
if the compression force is not applied, it does not generate electricity, but it generates electricity
only when the compression force is applied.
[0036]
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Therefore, when the load is not loaded and not loaded to the throat shown in FIG. 2A, for
example, vibration is applied to the throat microphone 1 by transmitting it through the neck
band 2 and bolt tightening Langevin vibration in the housing 10 Even if the element 20 vibrates,
the vibration does not generate noise.
[0037]
On the other hand, when the throat microphone 1 is attached to the throat, the throat closely
contacts the contactor 30 and presses it.
By this pressing, the second elastic supporting means 31 is deformed and the contact 30 is
moved to the side of the bolted Langevin vibrator 20 side.
When it moves further, it abuts on the first metal block 23 and presses it.
[0038]
By this pressing, the first elastic support means 29 is deformed and the bolt-clamped Langevin
vibrator 20 moves toward the bottom 10a of the housing and abuts on the bottom 10a. As a
result, as shown in FIG. 2 (b), the contact 30 is pushed into the housing 10, and the bolted
Langevin vibrator 20 is sandwiched between the contact 30 and the bottom portion 10 a of the
housing 10 so that the throat portion The vibration generated by is applied as compression force.
[0039]
As a result, a compressive force corresponding to the strength of the vibration generated in the
throat is applied to the bolt-clamped Langevin vibrator 20, and the power generation function of
the bolt-clamped Langevin vibrator 20 produces the throat from the output terminals Ta and Tb
A voltage corresponding to the strength of the vibration is output as an audio signal.
[0040]
As described above, according to the present invention, by using a bolt-clamped Langevin
vibrator, noise suppression parts such as a vibration-electric converter for vibration noise
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detection and a VOX circuit for audio signal output control become unnecessary. Vibrations
occurring in the throat can be converted into audio signals without generating vibration noise.
[0041]
DESCRIPTION OF SYMBOLS 1 throat microphone 2 neck band (holding member) 10 housing 10
a housing bottom portion 10 b housing opening portion 20 bolt tightening Langevin vibrator 21
first piezoelectric element 22 second piezoelectric element 23 first metal block 24 second metal
block 25 tightening Bolt 26 First electrode plate (positive electrode side) 27 Second electrode
plate (negative electrode side) 28 Third electrode plate (negative electrode side) 29 First elastic
support means 30 Contact 31 Second elastic support means
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