Title:
VIBRATION DETECTOR
Document Type and Number:
WIPO Patent Application WO/2002/065812
Kind Code:
A1
Abstract:
A small photodetector type microphone (10) exhibiting excellent directivity without requiring any mirror face. A diaphragm (27) vibrates in response to a sound pressure. An optical waveguide (28) is formed along the diameter of the diaphragm (27) and integral vibration of the optical waveguide (28) and the diaphragm (27) causes a variation in the quantity of light leaking from the optical waveguide (28) to the outside thus causing variation in the quantity of light being transmitted across the optical waveguide (28). The optical waveguide (28) has one end side for introducing light into a light emitting element (20) and the other end side for delivering light to a light receiving element (24). The light receiving element (24) outputs an electric signal related to the quantity of incident light.
Inventors:
MIYAZAWA HIROSHI (JP)
OKA YOSHIKAZU (JP)
OKA YOSHIKAZU (JP)
Application Number:
PCT/JP2002/001087
Publication Date:
August 22, 2002
Filing Date:
February 08, 2002
Export Citation:
Assignee:
KENWOOD CORP (JP)
MIYAZAWA HIROSHI (JP)
OKA YOSHIKAZU (JP)
MIYAZAWA HIROSHI (JP)
OKA YOSHIKAZU (JP)
International Classes:
G01H9/00; H04R23/00; (IPC1-7): H04R23/00; G01H9/00
Foreign References:
| JPS61170623A | 1986-08-01 | |||
| JPH02107927A | 1990-04-19 | |||
| US4268116A | 1981-05-19 |
Other References:
See also references of EP 1367855A4
Attorney, Agent or Firm:
Okabe, Masao (Fuji Bldg. 2-, Marunouchi 3-chome Chiyoda-ku Tokyo, JP)
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