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:
Mar. 22, 2005
Filed:
Apr. 19, 2001
Takanobu Takeuchi, Tokyo, JP;
Yoshiaki Ohbayashi, Osaka, JP;
Mamoru Yasuda, Osaka, JP;
Shinichi Saeki, Osaka, JP;
Takanobu Takeuchi, Tokyo, JP;
Yoshiaki Ohbayashi, Osaka, JP;
Mamoru Yasuda, Osaka, JP;
Shinichi Saeki, Osaka, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Hosiden Corporation, Yao, JP;
Abstract
A semiconductor electret capacitor microphone includes a vibration membrane, a semiconductor chip on which are formed a necessary electronic circuit, a fixed electrode, a spacer for preserving a predetermined space between the fixed electrode and the vibration membrane, and a case for enclosing the semiconductor chip and the vibration membrane in such a configuration that the fixed electrode is connected to the ground and the vibration membrane is connected to an input electrode of the semiconductor chip.