JP2001290113A - Spectacles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide spectacles with directional microphones which do not hinder the mounting of microphone elements at the time of using and can collect sounds by discriminating the sounds of different directions. SOLUTION: The spectacles mounted with a plurality of acoustic-electric conversion elements 5, 6 and 7 having bi-directivity at a frame 10 are formed by using the optical microphone elements which are arranged with light emitting elements LDs and light receiving elements PDs directed to diaphragms 2, radiate light from the light emitting elements LDs to the diaphragms 2, receive the reflected light from the diaphragms 2 it the light receiving elements PDs and detect the acoustic vibration displacement of the diaphragms 2 as the acousto- electric conversion elements 5, 6 and 7 described above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to spectacles, and more particularly to spectacles provided with an optical microphone element.

[0002]

2. Description of the Related Art There is known a directional microphone device in which a plurality of small directional microphone elements are arranged and the directivity is sharpened by utilizing a level difference or a phase difference between the elements. Such a directional microphone device is used by being attached to various instruments. However, the conventional directional microphone device is large in shape and is not suitable for mounting on a frame such as glasses. Therefore, if the size of the microphone element is limited in order to reduce the size, the diaphragm becomes smaller accordingly, and there is a problem that the sensitivity is reduced in the conventional condenser microphone. Further, when the conventional directional microphone device is mounted on the frame of the spectacles, the shape is too large, which hinders the use of the spectacles, and the mounted microphone device hinders the use of the spectacles.

[0003]

When the directional microphone device is used by mounting it on a frame of eyeglasses, an element having a small shape and high microphone sensitivity is required. Furthermore, in order to make the frame of the eyeglasses as normal as possible in appearance, it is necessary to be thin and to have the thickness of the eyeglass frame approximately equal to the thickness of the frame. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to provide eyeglasses equipped with a lightweight, thin, and sharply directional microphone element.

[0004]

SUMMARY OF THE INVENTION Eyeglasses according to the present invention are glasses having a plurality of bidirectional acoustoelectric transducers mounted on a frame, wherein the acoustoelectric transducers emit light in opposition to a diaphragm. An optical microphone element for arranging an element and a light receiving element, emitting light from the light emitting element to the diaphragm, receiving reflected light from the diaphragm with the light receiving element, and detecting acoustic vibration displacement of the diaphragm. Is used.

In the eyeglasses, it is preferable that at least one of the acoustoelectric conversion elements is mounted on a front frame. In the eyeglasses, it is preferable that at least one of the acoustoelectric conversion elements is mounted on a side frame. Further, in the glasses, the mounting angle of the acoustoelectric conversion element can be adjusted. Further, in the glasses, the acoustoelectric conversion element may be mounted on the side frame as a pair. Further, in the spectacles, an interval between the plurality of optical microphone elements can be changed so that a dip occurs at a desired frequency. Further, in the spectacles, the outputs of the plurality of optical microphone elements may be respectively taken out via delay circuits and integrated, so that a dip occurs at a desired frequency. Further, in the spectacles, it is preferable that a light emitting element of the optical microphone element is a vertical surface emitting laser element (VCSEL).

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, an optical microphone element is used as an acoustoelectric conversion element mounted on spectacles. FIG. 4 is a diagram showing the structure of the optical microphone element.
(A) is a cross-sectional view thereof, and (B) is an enlarged plan view of a light emitting / receiving section. As shown in FIG.
A light emitting element L is provided on the bottom surface 4 of the container 1 having openings 3a and 3b.
D and the light receiving element PD are arranged. In this mounting, a substrate (not shown) is provided on the bottom surface 4 and the light emitting element LD is provided on the substrate.
And the light receiving element PD, and this substrate can be attached to the bottom surface 4. If the bottom surface 4 is formed of a semiconductor substrate such as silicon, an electric circuit can be formed on the semiconductor substrate. Therefore, the connection of the substrate on which the light emitting and receiving elements are mounted and the electronic circuit formed on the bottom surface 4 is performed. It is possible to supply input / output signals to the light emitting element. FIG.
In the example shown in FIG. 1, 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 arranged at the center of the substrate, and a plurality of light receiving elements PD1, PD2, PD3 are arranged concentrically around the surface emitting laser diode LD.

FIG. 4B is an enlarged plan view of the light emitting and receiving element surrounded by a dotted line in FIG. In the example shown in FIG. 4A, a light emitting element LD having a circular shape is arranged at the center, and three light receiving elements PD1, concentrically surround the light emitting element LD1.
Although PD2 and PD3 are arranged, as shown in FIG. 4B, the light receiving elements PD can be arranged n-fold. 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, and the light receiving and emitting element of the conventional optical microphone element can be obtained. Can be realized with a high accuracy of 1/100 or less as compared with the alignment accuracy of (1).

In general, a vertical cavity surface emitting type light emitting device (V
CSEL) has a characteristic that the emission intensity distribution is substantially uniform in a concentric manner. Therefore, the radiated light emitted from the light emitting element LD arranged at the center toward the diaphragm 2 at a predetermined angle toward the diaphragm 2 is concentrically reflected with the same intensity, and the diaphragm 2 vibrates due to the reception of a sound wave. This changes the reflection angle and reaches the light receiving element PD concentrically.

Therefore, the vibration displacement of the diaphragm 2 can be detected by detecting a change in the amount of received light of the light receiving elements PD1 to PDn arranged concentrically. This makes it possible to detect the intensity of the incident sound wave, so that it can be used as an optical microphone element. Note that an electrode 11 is formed for driving the light emitting element LD and the light receiving element PD or detecting the amount of incident light. The openings 3a and 3b provided on the bottom surface 4 of the container 1 are provided to allow sound waves to enter from the back surface of the diaphragm 2, and
By providing b, this optical microphone element exhibits bidirectionality having directivity in the front direction and the rear direction of the diaphragm 2.

FIG. 1 is a perspective view of spectacles showing an embodiment of the present invention. A plurality of bidirectional optical microphone elements as shown in FIG. In the embodiment shown in FIG.
The elements 5a and 5b are mounted on the side frames 20a and 2
The elements 6a, 7a, 6b, 7b are mounted on 0b, respectively. The optical microphone elements mounted on the side frames 20a and 20b are mounted in pairs so as to be symmetrical.

The element 5 mounted on the front frame 10a
a and 5b are mounted in such a manner that the diaphragm is oriented in the lateral direction along the handle of the glasses so that the diaphragm is oriented in the front-back direction.
Basically, it has bidirectional directional characteristics in the front and rear of the glasses, but it is biased to one side due to the effect of the human face when wearing the frame or glasses behind the diaphragm. And sex. The elements 6a, 7a, 6b, 7b are mounted in such a manner that the diaphragm faces in the horizontal direction along the handle of the side frames 20a, 20b, respectively.

The directivity of the microphone elements mounted on the side frames 20a and 20b also becomes one-sided due to the influence of the face. When the outputs of the microphone elements provided on the side frames 20a and 20b are integrated, sharp directivity can be provided in the horizontal direction. Finally, for example, three elements 5b, 6 mounted on the left frame
The total directivity obtained by integrating the outputs b and 7b is a characteristic having sharp directivity in the front direction and the left direction as shown in FIG. Therefore, if sound is collected using the glasses as shown in FIG. 2, sounds in the forward and lateral directions can be efficiently collected.

Further, since the combination of these three elements is on the left and right sides of the spectacle frame, the right and left sounds are divided and picked up in the right microphone element set, and the front and left sounds are picked up in the left microphone element set. Can be. Thus, when these outputs are input to the left and right ears, the directions of the front and left and right sounds can be clearly identified. In the embodiment shown in FIGS. 1 and 2, the distance between the microphone elements is about 3 cm.
And a delay circuit is provided at the output of each microphone element to integrate and control the phase.

According to actual measurements by the inventors, due to this 3 cm interval, if no temporal processing is performed, a sound arriving from the front or rear will cause a dip at around 2.5 KHz or 5 KHz, and the timbre has a distinctive characteristic. Occurs. Conversely, if temporal processing is intentionally performed, it is possible to cause a change in timbre by generating a dip at an appropriate frequency even for a sound from the lateral direction. Therefore, the desired sound quality can be adjusted to some extent.

FIG. 3 shows another embodiment of the present invention, in which the mounting angle of the microphone element mounted on the side frame can be adjusted. For example, if this mounting angle is adjusted so that the orientation of the microphone elements all faces the front, sharper directivity can be provided in the front direction, and almost no horizontal sound can be heard. Can also. Therefore, when the device is used in an environment where noise from the lateral direction arrives, the embodiment shown in FIG. 3 is preferable. In addition, by adjusting the angle of each microphone element not only in the front direction but also in various ways, the degree of freedom of directivity adjustment increases, and the range of application can be expanded.

[0016]

As described above, according to the present invention, an optical microphone element is used as an acoustoelectric conversion element, and a plurality of such microphones are mounted on a frame to realize eyeglasses with a microphone. The optical microphone element has bidirectionality,
Moreover, since it can be made extremely thin, it can be realized to the thickness of the frame. Therefore, the spectacles can be configured in the same form as a normal frame without significantly breaking the shape of the frame.

Further, since the optical microphone elements are provided in the left and right frames, front and left and right sounds can be separated and collected, and the arrival direction of the sound can be clearly identified. Furthermore, a dip can be generated at an appropriate frequency by the interval between the mounted microphone elements and the installation of the delay circuit, so that the tone can be changed, and the desired tone quality can be adjusted. Further, by adjusting the angle of the microphone element, the degree of freedom of the directivity adjustment can be increased, and desired directivity can be realized.

[Brief description of the drawings]

FIG. 1 is a perspective view of eyeglasses according to an embodiment of the present invention.

FIG. 2 is a view for explaining directivity characteristics in the glasses of FIG. 1;

FIG. 3 is a diagram showing another embodiment of the present invention.

FIG. 4 is a diagram showing a structure of an optical microphone element;
(A) is a sectional view thereof, and (B) is an enlarged plan view of a light emitting / receiving section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container 10a Front frame 20a, b Side frame 5, 6, 7 Optical microphone element LD Light emitting element PD Light receiving element

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroshi Miyazawa 1-14-6 Dogenzaka, Shibuya-ku, Tokyo F-term in Kenwood Corporation (reference) 5D021 DD04

Claims (8)

[Claims] 1. A pair of eyeglasses having a plurality of bidirectional acoustoelectric transducers mounted on a frame, wherein the acoustoelectric transducers include a light emitting element and a light receiving element facing a diaphragm, A pair of spectacles, comprising: an optical microphone element that emits light from a light emitting element to the diaphragm, receives reflected light from the diaphragm by the light receiving element, and detects an acoustic vibration displacement of the diaphragm. 2. The eyeglasses according to claim 1, wherein at least one of the acoustoelectric conversion elements is mounted on a front frame. 3. The spectacles according to claim 1, wherein at least one of the acoustoelectric conversion elements is mounted on a side frame. 4. The spectacles according to claim 1, wherein a mounting angle of the acoustoelectric conversion element is adjustable. 5. The spectacles according to claim 1, wherein the acoustoelectric conversion elements are mounted on a side frame as a pair. 6. The eyeglasses according to claim 1, wherein an interval between the plurality of optical microphone elements is changed so that a dip occurs at a desired frequency. 7. The glasses according to claim 1, wherein outputs of said plurality of optical microphone elements are respectively taken out via delay circuits and integrated, so that a dip occurs at a desired frequency. glasses. 8. The spectacles according to claim 1, wherein the light emitting element of the optical microphone element is a vertical surface emitting laser element (VCSEL).