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:
Sep. 03, 2013
Filed:
Nov. 13, 2009
Fuminori Tanaka, Osaka, JP;
Ryusuke Horibe, Osaka, JP;
Takeshi Inoda, Osaka, JP;
Masatoshi Ono, Ibaraki, JP;
Rikuo Takano, Ibaraki, JP;
Toshimi Fukuoka, Kanagawa, JP;
Fuminori Tanaka, Osaka, JP;
Ryusuke Horibe, Osaka, JP;
Takeshi Inoda, Osaka, JP;
Masatoshi Ono, Ibaraki, JP;
Rikuo Takano, Ibaraki, JP;
Toshimi Fukuoka, Kanagawa, JP;
Funai Electric Co., Ltd., Osaka, JP;
Funai Electric Advanced Applied Technology Research Institute Inc., Osaka, JP;
Abstract
A microphone unit includes: a housing; a diaphragm which is disposed in the inside of the housing; and an electric circuit portion which processes an electric signal that is generated based on a vibration of the diaphragm. In the housing, a first sound guide space which guides a sound outside the housing to a first surface of the diaphragm via a first sound hole and a second sound guide space which guides a sound outside the housing to a second surface, that is, an opposite surface of the diaphragm via a second sound hole are formed. The electric circuit portion is disposed in either one of the first sound guide space and the second sound guide space; and an acoustic resistance portion which adjusts at least one of a frequency characteristic of the first sound guide space and a frequency characteristic of the second sound guide space is formed.