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. 30, 2014
Filed:
Nov. 04, 2011
Applicant:
Haruhito Shimura, Tokyo, JP;
Inventor:
Haruhito Shimura, Tokyo, JP;
Assignee:
Kabushiki Kaisha Audio-Technica, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H04R 25/00 (2006.01); H04R 19/01 (2006.01); H04R 9/08 (2006.01);
U.S. Cl.
CPC ...
H04R 19/016 (2013.01);
Abstract
A condenser microphone includes a plurality of condenser microphone units, each unit including a diaphragm and a fixed electrode one of which has an electret layer thereon. The condenser microphone units include respective sensitivity controllers changing sensitivities of the units. The sensitivity controllers include respective variable resistors connected between a power source and a ground. Each of the variable resistors has a slidable terminal connected to one, opposed to the electret layer, of the diaphragm and the fixed electrode, of the corresponding condenser microphone unit.