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:
Feb. 03, 2015
Filed:
Dec. 04, 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 case; a diaphragm arranged inside the case; and an electric circuit unit that processes an electric signal generated in accordance with vibration of the diaphragm. The case has a first sound introducing space that introduces a sound from outside of the case to a first surface of the diaphragm via a first sound hole; and a second sound introducing space that introduces a sound from outside of the case to a second diaphragm, via a second sound hole. A resonance frequency of the diaphragm is set in the range of ±4 kHz based on the resonance frequency of at least one of the first sound introducing space and the second sound introducing space.