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:
Dec. 16, 2008
Filed:
Feb. 24, 2005
Hiroshi Ogura, Tokyo, JP;
Tohru Yamaoka, Osaka, JP;
Hiroshi Ogura, Tokyo, JP;
Tohru Yamaoka, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An electret condenser microphone includes: a substratein which an openingis formed; an electret condenserconnected to one face of the substrateso as to close the openingand having an acoustic holeand a cavitya drive circuit elementconnected to the one face of the substrateand a casemounted over the substrateso as to cover the electret condenserand the drive circuit elementElectric contact is established at a joint part between the electret condenserand the substrateThe acoustic holecommunicates with an external space through the openingThe cavityand an internal region of the caseserve as a back air chamber for the electret condenser