The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 24, 2008
Filed:
Dec. 11, 2000
Okihiro Kobayashi, Yokohama, JP;
Nobuhiro Miyahara, Ota-ku, JP;
Yutaka Hattori, Machida, JP;
Hiroshi Miyazawa, Tokorozawa, JP;
Junichi Hayakawa, Kawasaki, JP;
Okihiro Kobayashi, Yokohama, JP;
Nobuhiro Miyahara, Ota-ku, JP;
Yutaka Hattori, Machida, JP;
Hiroshi Miyazawa, Tokorozawa, JP;
Junichi Hayakawa, Kawasaki, JP;
Kabushiki Kaisha Kenwood, Tokyo, JP;
Abstract
An optical acoustoelectric transducer having a directivity pattern like a betterby receiving by a light-receiving element a reflected fraction of the light from a light-emitting device disposed at the center of a bottom plate that is parallel to a diaphragm, has an opening through which an acoustic wave enters, and is connected to supporting side plates. An optical acoustoelectric transducer having uniform amplitude characteristics in a wide frequency range by mixing by a mixer circuit the outputs of a plurality of optical microphones having diaphragms of mutually different thicknesses so as to make the receiving sensitivity uniform in different frequency ranges. A directional optical acoustoelectric transducer having a small size and wide band characteristics by arranging a plurality of light-emitting devices (LD) and a plurality of light-receiving elements (PD) corresponding to a plurality of diaphragms arranged parallel.