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JP2001290113

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DESCRIPTION JP2001290113
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
eyeglasses, and more particularly to eyeglasses having an optical microphone element attached
thereto.
[0002]
2. Description of the Related Art A directional microphone device is known in which a plurality of
small directional microphone elements are arranged, and the directivity is sharpened by utilizing
a level difference and a phase difference between the elements. Such directional microphone
devices are used by being attached to various instruments. However, conventional directional
microphone devices are large in shape and are unsuitable for mounting on frames such as
glasses. Therefore, when the size of the microphone element is limited in order to miniaturize,
there is a problem that the diaphragm also becomes small accordingly and the sensitivity of the
conventional condenser microphone becomes low. Furthermore, when the conventional
directional microphone device is attached to the frame of the glasses, there is a problem that the
use of the glasses is disturbed because the shape is too large, and the attached microphone
device becomes an obstacle and the glasses can not stand practical use.
[0003]
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As described above, when the directional microphone device is used by being attached to a frame
of glasses, an element having a small shape and high microphone sensitivity is required.
Furthermore, in order to make the frame of the glasses as similar as possible to the usual ones, it
is necessary to be thin and have a thickness as thin as that of the frames of the glasses. The
present invention has been made to solve the above-mentioned problems, and it is an object of
the present invention to provide eyeglasses to which a lightweight, thin and directional sharp
microphone element is attached.
[0004]
The eyeglasses according to the present invention are eyeglasses in which a plurality of bidirectional acousto-electrical conversion elements are mounted on a frame, and the acoustoelectrical conversion element emits light opposite to a diaphragm. An optical microphone
element arranged with an element and a light receiving element, emitting light from the light
emitting element to the vibrating plate, receiving reflected light from the vibrating plate by the
light receiving element, and detecting an acoustic vibration displacement of the vibrating plate
Use
[0005]
In the glasses, preferably, at least one of the acousto-electrical conversion elements is attached to
a front frame.
In the glasses, preferably, at least one of the acoustoelectric conversion elements is attached to a
side frame. Furthermore, in the glasses, the mounting angle of the acoustoelectric conversion
element can be adjusted. Further, in the glasses, the acoustoelectric conversion elements can be
attached to the side frame as a pair. Further, in the glasses, the distance between the plurality of
optical microphone elements can be varied so as to produce a dip at a desired frequency.
Furthermore, in the glasses, the outputs of the plurality of optical microphone elements can be
respectively taken out through delay circuits and integrated so that a dip occurs at a desired
frequency. Furthermore, in the glasses, the light emitting element of the optical microphone
element is preferably a vertical surface emitting laser element (VCSEL).
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, an optical
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microphone element is used as an acoustoelectric conversion element to be mounted on glasses.
4A and 4B are diagrams showing the structure of the optical microphone element, and FIG. 4A is
a cross-sectional view thereof, and FIG. 4B is an enlarged plan view of the light emitting and
receiving unit. As shown in FIG. 4A, the light emitting element LD and the light receiving element
PD are disposed on the bottom surface 4 of the container 1 having the openings 3a and 3b on
the bottom surface 4. This mounting can also be performed by providing a substrate (not shown)
on the bottom surface 4, arranging the light emitting element LD and the light receiving element
PD on this substrate, and sticking the substrate on the bottom surface 4. If the bottom surface 4
is formed of a semiconductor substrate such as silicon, an electric circuit can be formed thereon.
Therefore, it is possible to connect the substrate on which the light emitting / receiving element
is mounted and the electronic circuit formed on the bottom surface 4. It becomes possible to
supply input and output signals to the light emitting element. In the example shown in FIG. 4, a
vertical cavity surface emitting laser (VCSEL) LD is used as a light emitting element, and a
photodiode PD is used as a light receiving element. A circular surface emitting laser diode LD is
disposed at the center of the substrate, and a plurality of light receiving elements PD1, PD2, and
PD3 are disposed concentrically so as to surround the surface emitting laser diode LD.
[0007]
FIG. 4 (B) is an enlarged plan view of the light emitting / receiving element shown by being
surrounded by a dotted line in FIG. 4 (A). In the example shown in FIG. 4A, the circular light
emitting element LD is disposed at the central portion, and the triple light receiving elements
PD1, PD2, and PD3 are disposed concentrically so as to surround the light emitting element LD.
The light receiving element PD can also be disposed in n layers as shown in FIG. The light
emitting element LD and the light receiving element PD can be simultaneously formed on a
gallium arsenide wafer by a semiconductor manufacturing process. Therefore, since the
alignment accuracy between the light emitting element LD and the light receiving element PD is
determined by the accuracy of the mask used in the semiconductor manufacturing process, the
alignment accuracy can be made 1 μm or less. This can be realized with a high accuracy of
1/100 or less compared to the alignment accuracy of
[0008]
In general, a vertical cavity surface emitting type light emitting device (VCSEL) has substantially
uniform light emission intensity distribution concentrically. Therefore, the radiation light emitted
toward the diaphragm 2 at a predetermined angle from the light emitting element LD disposed at
the central portion is concentrically reflected with the same intensity, and the diaphragm 2
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vibrates due to the reception of the sound wave. As a result, the reflection angle changes, and the
light reaches the light receiving element PD concentrically.
[0009]
Therefore, it is possible to detect the vibration displacement of the diaphragm 2 by detecting the
change in the amount of light received by the light receiving elements PD1 to PDn arranged
concentrically. Since the strength of the incident sound wave can be detected by this, it can be
used as an optical microphone element. An electrode 11 is formed to drive the light emitting
element LD or the light receiving element PD or to detect the amount of incident light. Further,
the openings 3a and 3b provided on the bottom surface 4 of the container 1 are provided to
receive sound waves from the back surface of the diaphragm 2. By providing the openings 3a
and 3b, the optical microphone element can It exhibits bi-directionality with directivity in the
front direction and the back direction.
[0010]
FIG. 1 is a perspective view of eyeglasses showing an embodiment of the present invention. A
plurality of optical microphone elements having bidirectivity as shown in FIG. In the embodiment
shown in FIG. 1, the elements 5a and 5b are attached to the front frame 10a, and the elements
6a, 7a, 6b and 7b are attached to the side frames 20a and 20b, respectively. The optical
microphone elements mounted on the side frames 20a and 20b are mounted in pairs so as to be
symmetrical with each other.
[0011]
The elements 5a and 5b mounted on the front frame 10a are mounted in such a manner that the
diaphragm is oriented in the lateral direction along the handle of the glasses such that the
diaphragm is oriented in the front-rear direction. Basically, it has bi-directional directional
characteristics in the front direction and the back of the glasses, but the direction is biased to one
side due to the influence of the human face when wearing the frame or glasses behind the
diaphragm It becomes sex. The elements 6a, 7a, 6b, 7b are mounted in such a manner that the
diaphragm is directed laterally along the handles of the side frames 20a, 20b.
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[0012]
The directivity of the microphone elements mounted on the side frames 20a and 20b is also
biased to one side due to the influence of the face. When the outputs of the microphone elements
provided in the side frames 20a and 20b are integrated, it becomes possible to give sharp
directivity in the lateral direction. Finally, for example, the integrated directivity obtained by
integrating the outputs of the three elements 5b, 6b and 7b mounted on the left frame has sharp
directivity in the front direction and the left direction as shown in FIG. It becomes the
characteristic which it possesses. Therefore, if sound collection is performed using glasses as
shown in FIG. 2, it is possible to efficiently collect forward and lateral sounds.
[0013]
Furthermore, since the combination of these three elements is on the left and right of the
eyeglass frame, it is possible to divide and pick up the front and right sounds in the right
microphone element set and the front and left sounds in the left microphone element set. As a
result, when these outputs are input to the left and right ears, respectively, it becomes possible to
clearly distinguish the directions of the front and left and right sounds. In the embodiment shown
in FIGS. 1 and 2, the microphone elements are disposed at intervals of about 3 cm, and delay
circuits are provided at the outputs of the respective microphone elements to integrate and
control the phase. Configured.
[0014]
According to the measurement of the inventors, due to this 3 cm interval, the sound coming from
the front or the rear dips at around 2.5 KHz or 5 KHz if no temporal processing is performed,
and the timbre is characterized. Conversely, if temporal processing is intentionally performed, it
is possible to cause a change in timbre by causing dips to be generated at appropriate
frequencies even for sounds from the lateral direction. Therefore, the desired sound quality
adjustment is possible to some extent.
[0015]
FIG. 3 shows another embodiment of the present invention, in which the mounting angle of the
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microphone element mounted on the side frame can be adjusted. For example, by adjusting this
mounting angle so that all the microphone elements are directed to the front, it is possible to
make the directivity more sharp in the front direction and to make the lateral sound hardly
audible. You can also. Therefore, when used under an environment where noise from the lateral
direction arrives, an embodiment as shown in FIG. 3 is preferable. Further, by adjusting the angle
of each microphone element not only in the front direction but also variously, the degree of
freedom in adjusting the directivity can be increased, and the application range can be expanded.
[0016]
As described above, in the present invention, a plurality of optical microphone elements are used
as acoustoelectric conversion elements, which are mounted on a plurality of frames, thereby
realizing microphone glasses. Since the optical microphone element is bi-directional and can be
made extremely thin, it can be realized as thick as the frame. Therefore, the glasses can be
configured in the same form as a normal frame without largely breaking the shape of the frame.
[0017]
Furthermore, since the optical microphone elements are provided on the left and right frames, it
is possible to separate and collect the front and left and right sounds, and to clearly identify the
arrival direction of the sounds. Furthermore, since the dip can be generated at an appropriate
frequency by the distance between the attached microphone elements and the installation of the
delay circuit, it is possible to generate a change in timbre, and the tone quality can be adjusted as
desired. Also, by adjusting the angle of the microphone element, the degree of freedom in
adjusting the directivity can be increased, and desired directivity can be realized.
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