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:
Oct. 16, 2007
Filed:
Feb. 28, 2003
Takeshi Nishimura, Tokyo, JP;
Kenji Iizuka, Tokyo, JP;
Masayuki Ishiwa, Tokyo, JP;
Shigeo Yamaguchi, Tokyo, JP;
Tsutomu Yokoyama, Tokyo, JP;
Masaaki Arahori, Tokyo, JP;
Hideharu Yonehara, Tokyo, JP;
Hiroshi Ikeda, Tokyo, JP;
Sadaaki Sakurai, Tokyo, JP;
Takeshi Nishimura, Tokyo, JP;
Kenji Iizuka, Tokyo, JP;
Masayuki Ishiwa, Tokyo, JP;
Shigeo Yamaguchi, Tokyo, JP;
Tsutomu Yokoyama, Tokyo, JP;
Masaaki Arahori, Tokyo, JP;
Hideharu Yonehara, Tokyo, JP;
Hiroshi Ikeda, Tokyo, JP;
Sadaaki Sakurai, Tokyo, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
The present invention provides a planer acoustic transducer including a vibrating diaphragm including a spiral voice coil provided on both surfaces or on one surface of an insulating base film; and a permanent magnet corresponding to the voice coil, wherein, in the vibrating diaphragm, the spiral voice coil is formed by applying a wire conductor, in a coil pattern, onto a sheet-like substrate having an adhesive layer on at least one surface thereof. Alternatively, at least a portion of the vibrating diaphragm, which portion corresponds to the loop of a first or second vibration mode, is reinforced with a rigidity-imparting member; the substrate of the vibrating diaphragm is formed of a resin foam; or the voice coil is formed three-dimensionally.