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JP2006197209

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DESCRIPTION JP2006197209
PROBLEM TO BE SOLVED: To provide a light-based microphone that can easily detect sound
waves in a plurality of areas without the need to install a plurality of light sources. SOLUTION:
Laser light output from a laser emitting unit 30 and divided in the direction of arrow B by a beam
splitter is formed from holes 50-1 to 50-5 provided in an inner peripheral surface 11A of a
housing 10. Passing through the space portion (area A to area E) between the inner peripheral
surface 11A and the inner peripheral surface 11B and the holes 51-1 to 51-5 provided in the
inner peripheral surface 11B of the housing 10 And the laser light receiver 40-1 to the laser light
receiver 40-5. The laser light receiving unit detects a light receiving position of the laser light
which is refracted and changed when the laser light passes the sound wave, and the audio signal
output unit outputs a signal corresponding to the detected position as an audio signal. [Selected
figure] Figure 2
マイクロホン
[0001]
The present invention relates to a technology for detecting sound using light.
[0002]
As a microphone replacing the conventional dynamic type or condenser type, there is a
microphone disclosed in Patent Document 1.
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1
The microphone emits a laser beam into the air, and converts a change in the amount of
refraction of the laser beam caused by the laser beam contacting the acoustic wave into an
electrical signal. According to this microphone, it is possible to prevent the deterioration of the
vibrating part due to long-term use and the breakage of the vibrating part due to the excessive
input since the mechanical vibrating part is not required as in the dynamic type or the capacitor
type. There is. Unexamined-Japanese-Patent No. 5-227597
[0003]
Now, in the microphone disclosed in Patent Document 1, it is possible to detect a sound wave
that has passed through a predetermined area by widening the area through which laser light
passes in the air. Further, by installing a plurality of microphones, it is possible to detect a sound
wave passing through each area by a plurality of areas with a laser beam. However, installing a
plurality of light sources that output laser light in order to detect sound waves in a plurality of
areas is a troublesome task for the user, and there is a problem that it takes time and effort.
[0004]
The present invention has been made under the above-described background, and it is an object
of the present invention to provide a light-based microphone that can easily detect sound waves
in a plurality of areas without the need to install a plurality of light sources. .
[0005]
In order to solve the problems described above, according to the present invention, a plurality of
light sources are provided which output coherent light in a first direction, and a plurality of light
sources are disposed on a path of coherent light output in the first direction from the light source
And a plurality of splitters for splitting the incident coherent light into the first direction and a
second direction different from the first direction, and after being split in the second direction by
the plurality of splitters, pass through the medium The plurality of detection means for receiving
the coherent light and detecting the light reception position of the coherent light refracted
according to the density change of the medium due to sound, and outputting a signal
corresponding to the light reception position detected by the detection means A microphone
having signal output means.
[0006]
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2
In a preferred aspect, the microphones are disposed on paths of respective coherent light split in
the second direction by the plurality of splitters, and a plurality of microphones that reflect the
light split in the second direction by the splitters And a plurality of second reflecting members
disposed for each of the plurality of first reflecting members so as to be opposed to the first
reflecting member, and for reflecting light reflected by the first reflecting member toward the
first member. A reflective member, and the plurality of detection means receive coherent light
reflected a plurality of times by the first reflective member and the second reflective member,
and detect a light receiving position of the received coherent light It is also good.
Further, the case is a hollow case, and is provided with an opening for receiving the light source
and the plurality of splitters and for emitting the coherent light split in the second direction by
the splitter to the outside of the case. A housing may be provided.
Further, the casing is a rectangular annular casing, and the light source and the plurality of
splitters are accommodated inside along one long side of the rectangle, and along the other long
side. The plurality of detection means may be accommodated, and the housing may be provided
with an opening through which coherent light split in the second direction by the plurality of
splitters passes.
[0007]
According to the present invention, sound waves in a plurality of areas can be easily detected
without installing a plurality of light sources.
[0008]
First Embodiment Hereinafter, an embodiment of the present invention will be described with
reference to the drawings.
FIG. 1 is an external view of a microphone 1 according to an embodiment of the present
invention, and FIG. 2 is a view schematically showing the inside of the microphone 1. FIG. 3 is a
block diagram showing the hardware configuration of the microphone 1.
[0009]
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3
As shown in FIG. 1, the housing 10 of the microphone 1 has a rectangular annular shape, and the
inside is hollow. Further, on one inner peripheral surface 11A along the longitudinal direction of
housing 10, holes 50-1 to 50-5 penetrating to the inside are provided at predetermined intervals
in the longitudinal direction, and inner peripheral surface 11A In the inner peripheral surface
11B opposite to the holes 51-1 through 51-5 penetrating to the inside are provided at
predetermined intervals in the longitudinal direction. In the housing 10, as shown in FIG. 2, the
laser emitting unit 30, the beam splitter 20-1 to the beam splitter 20-5, and the laser light
receiving unit 40-1 to the laser light receiving unit 40-6. And an audio signal output unit 100-1
to an audio signal output unit 100-5. The laser emitting unit 30, the beam splitter 20-1 to the
beam splitter 20-5, the laser light receiving unit 40-1 to the laser light receiving unit 40-6, and
the audio signal output unit 100-1 to the audio signal output unit 100-5 The housing 10 is fixed
to the inside by a support member (not shown).
[0010]
The laser emitting unit 30 is a light source that outputs laser light (coherent light) having a
predetermined wavelength and a predetermined beam diameter. In addition, the wavelength of
the laser beam which the laser emission part 30 outputs can be selected from arbitrary
wavelengths, such as a visible region and an infrared region. The laser emitting unit 30 is
disposed at one of the four corners of the rectangular housing 10 as shown in FIG. 2, and the
direction along the long side of the housing 10 (the arrow A direction in FIG. 2). Output laser
light.
[0011]
The beam splitter 20-1 to the beam splitter 20-5 divide the path of the laser beam output from
the laser emitting unit 30 into two paths, and when viewed from the laser emitting unit 30, the
beam splitter 20-1 and the beam splitter 20-2, ..., and beam splitters 20-5 are arranged at
predetermined intervals in the output direction of the laser beam. When the laser beam output
from the laser emitting unit 30 is incident on the beam splitter, it is split into light going straight
(the direction of arrow A) and light in a direction orthogonal to the straight direction (the
direction of arrow B in FIG. 2). Then, the laser beam output from the laser emitting unit 30 and
traveling straight through the beam splitters is incident on the laser light receiving unit 40-6.
Further, the laser light split in the direction of the arrow B by the beam splitter is the holes 50-1
to 50-5 provided on the inner peripheral surface 11A of the housing 10, the inner peripheral
surface 11A and the inner peripheral surface 11B. Through the space portion (area A to area E)
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and the holes 51-1 to 51-5 provided in the inner peripheral surface 11B of the housing 10, and
the laser light receiving unit 40-1 to the laser The light enters the light receiving unit 40-5.
[0012]
As shown in FIG. 4, the laser light receiving unit 40-1 to the laser light receiving unit 40-6
include photoelectric conversion elements arranged in an array. When the laser light is incident
on the laser light receiving unit, among the photoelectric conversion elements arranged in an
array, the photoelectric conversion element that detects the light converts the light into an
electric signal. Then, the generated electrical signal is output to the audio signal output unit as
shown in FIG.
[0013]
In the space between the inner circumferential surface 11A and the inner circumferential surface
11B, when no sound wave is generated in the air, the laser beam output from the laser emitting
portion and divided in the direction of arrow B by the beam splitter is the inner circumferential
surface It goes straight through the space between 11A and the inner circumferential surface
11B and enters the center of each laser light receiving unit. On the other hand, when a sound
wave is output from a sound source, a compressional wave is generated in the air, and a dense
portion and a coarse portion of the air propagate in the air to form a space between the inner
circumferential surface 11A and the inner circumferential surface 11B. Pass through the part.
Then, the laser light passes through the air density. FIG. 5 is a view schematically showing the
distribution of compression and compression waves and the state of laser light refracted by the
compression and compression waves. As light travels through the medium and is refracted to the
higher density of the medium, in FIG. 5, the laser light is refracted toward the dense portion of
the air. Here, the amount of refraction of the laser light increases when the laser light passes
through a portion where the amount of change in air density is large (that is, the dense or rough
portion of the compressional wave), and the air density when no sound wave is generated It
becomes smaller when passing at the same density as. In the space between the inner
circumferential surface 11A and the inner circumferential surface 11B, when the laser light
passing through the areas A to E passes through the sound wave and is refracted, the laser light
receiving portion 40-1 to the laser light receiving portion 40-5 In this case, the incident position
of the laser light is displaced from the center of the laser light receiver, and the amount of
displacement periodically changes according to the period of the compression wave (frequency
of the sound wave), and the amplitude of the compression wave (sound pressure level) The
amount of displacement increases accordingly. That is, the displacement of the incident position
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5
of the laser light in the laser light receiving unit represents sound.
[0014]
The audio signal output unit 100-1 to the audio signal output unit 100-5 are connected to the
laser receiving unit with the same branch number, analyze the electric signal output from the
laser receiving unit, and receive the light Identify the conversion element. Then, the distance
from the position of the photoelectric conversion element receiving the light to the center point
of the laser light receiving unit is determined. For example, the voltage value is 0 at the center
point, and the voltage corresponding to the distance when the distance from the center point is
long. Output a signal that becomes a value. As described above, since the displacement of the
position of the laser light in the laser light receiving unit represents sound, the signal output
corresponding to the position of the detected laser light represents sound.
[0015]
According to the present embodiment, the laser light is divided so as to pass through a plurality
of areas, and the sound waves passing through each area are detected by detecting the amount of
refraction of the divided laser light. Sound waves passing through a plurality of areas can be
detected without providing each area. In addition, since the laser emitting unit, the beam splitter,
and the laser receiving unit necessary for detecting the sound wave are all housed in the case 10,
when the sound wave in a plurality of areas is detected, the case 10 should be installed. As
compared with the case of installing a plurality of microphones, the microphones can be easily
installed. Further, the laser emitting unit, the beam splitter, and the laser receiving unit are
housed inside the housing 10, and the sound wave does not strike the laser emitting unit, the
beam splitter, and the laser receiving unit. Therefore, the beam splitter or the laser light receiving
unit is not vibrated by the sound wave, and only the amount of refraction of the laser light can be
detected. In addition, since the laser emitting unit, the beam splitter and the laser receiving unit
are housed inside the housing 10, there is little risk of contamination, breakage, displacement of
the arrangement position, etc., requiring maintenance work over a long period of time It can be
used without taking it. In addition, since the laser beam passes only the space portion inside the
inner peripheral surface of the housing 10, the laser beam does not enter the human eye, and the
voice can be detected safely.
[0016]
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6
Second Embodiment Next, a second embodiment of the present invention will be described with
reference to FIG. The configuration of the present embodiment is substantially the same as that
of the first embodiment, and therefore, the same parts as those of the first embodiment are
denoted by the same reference numerals, and the description thereof will be omitted.
[0017]
In the present embodiment, as shown in FIG. 6, the reflecting members 60-1 to 60-5 and the
reflecting members 61-1 to 61-5 are disposed inside the housing 10. The point is different from
the first embodiment. The surfaces of the reflection member 60-1 to reflection member 60-5 and
the reflection member 61-1 to reflection member 61-5 are mirror surfaces by an aluminum
deposition process or the like, and the reflection member 60-1 to reflection member 60- 5 are
disposed in the vicinity of the holes 50-1 to 50-5, and the reflection members 61-1 to 61-5 are
disposed in the vicinity of the holes 51-1 to 51-5.
[0018]
The light split in the direction of arrow B in FIG. 6 by the beam splitter 20-1 includes the hole 501, the space between the inner circumferential surface 11A and the inner circumferential surface
11B, and the hole 51-1. It passes and is reflected by the reflection member 61-1. The light
reflected by the reflecting member 61-1 passes through the hole 51-1, the space portion
between the inner circumferential surface 11A and the inner circumferential surface 11B, and
the hole 50-1, and is reflected by the reflecting member 60-1 Do. The light reflected by the
reflection member 60-1 is reflected between the reflection member 60-1 and the reflection
member 61-1 a plurality of times as shown in FIG. 6, and is incident on the laser light receiving
unit 40-1. . Also, between the reflecting member 60-2 and the reflecting member 61-2, between
the reflecting member 60-3 and the reflecting member 61-3, between the reflecting member 604 and the reflecting member 61-4, and the reflecting member Also between 60-5 and the
reflecting member 61-5, the light split in the direction of arrow B by the beam splitter is reflected
a plurality of times between the reflecting members and enters the laser light receiving unit.
[0019]
According to the present embodiment, since the laser light passes through the sound wave a
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plurality of times, the amount of refraction of light is increased as compared to the first
embodiment in which the laser light passes through the sound wave only once. Then, since the
amount of refraction of light increases, the amount of displacement in the laser light receiving
portion becomes larger compared to the first embodiment, and a sound wave can be detected
with high sensitivity.
[0020]
[Modifications] Although the embodiment of the present invention has been described above, the
present invention is not limited to the above-described embodiment, and can be practiced in
various other forms. For example, the above-described embodiment may be modified as follows
to implement the present invention.
[0021]
In the embodiment described above, the laser light receiving unit is disposed in the housing 10,
but as shown in FIG. 7, the laser emitting unit 30, the beam splitter 20-1 to the beam splitter 205, The laser light receiving unit 40-6 may be disposed inside the cylindrical case 10A, and the
laser light receiving unit 40-1 to the laser light receiving unit 40-5 may be arranged outside the
case 10A.
[0022]
In the embodiment described above, the number of beam splitters and laser light receiving
portions is five, but the number of beam splitters and laser light receiving portions is not limited
to this number, and may be five or less. , May be five or more.
[0023]
In the second embodiment described above, the laser light receiving unit 40-1 to the laser light
receiving unit 40-5 are disposed in the vicinity of the reflecting member 61-1 to the reflecting
member 61-5. The laser beam may be disposed in the vicinity of the reflection member 60-5 to
receive the laser beam reflected by the reflection member 61-1 to the reflection member 61-5.
[0024]
In the embodiment described above, when the housing 10 is twisted, the positions of the beam
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8
splitters 20-1 to 20-5 fixed inside the housing 10 change.
Then, when the position of the beam splitter changes, the position of the laser beam incident on
the laser light receiving unit 40-1 to the laser light receiving unit 40-5 shifts, and the sound wave
can not be detected correctly.
Therefore, the position of the laser beam incident on the laser light receiving unit 40-6 when the
housing 10 is not twisted is detected based on the signal output from the laser light receiving
unit 40-6 and stored. When the incident position of the laser beam in −6 is shifted from the
stored position, it is possible to give a warning to the user by sound or light, assuming that the
case 10 is twisted.
[0025]
It is an outline view of microphone 1 concerning a 1st embodiment of the present invention.
FIG. 2 is a view schematically showing the inside of the microphone 1; FIG. 2 is a block diagram
showing a hardware configuration of a microphone 1; It is a schematic diagram of a laser lightreceiving part. It is a figure which represented typically refraction | bending of the laser beam by
the density of a sound wave. It is a schematic diagram inside a microphone concerning a 2nd
embodiment of the present invention. It is a schematic diagram of the microphone concerning a
modification of the present invention.
Explanation of sign
[0026]
DESCRIPTION OF SYMBOLS 1 ... Microphone, 10, 10A ... Housing | casing 11A, 11B ... Inner
peripheral surface, 20-1 to 20-5 ... Beam splitter, 30 ... Laser emitting part, 40-1 40-6 ... laser
light receiving part, 50-1 to 50-5, 51-1 to 51-5 ... hole, 60-1 to 60-5, 61-1 to 61-5 ... reflecting
member , 100-1 to 100-5: audio signal output unit.
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