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:
Nov. 06, 2007
Filed:
Jan. 30, 2003
Applicants:
Shinichi Saeki, Kashiwara, JP;
Hirofumi Yamada, Sakai, JP;
Inventors:
Shinichi Saeki, Kashiwara, JP;
Hirofumi Yamada, Sakai, JP;
Assignee:
Hosiden Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R 25/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention is an electret condenser microphone that includes an electro-acoustic transducer (M) having an electret portion (E) including a diaphragm () acting as an electrode and a stationary electrode () disposed in opposition to the diaphragm (), and a FET () effecting an impedance conversion on an output from the electro-acoustic transducer (M) and then outputting the converted output on a signal line (L). A capacitor () and a varistor () are provided in parallel between the signal line (L) and a ground () and a resistor () is incorporated in series in the signal line (L).