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:
Oct. 18, 1994
Filed:
Sep. 28, 1992
Applicant:
Inventors:
Tomohiro Waji, Kanagawa, JP;
Kazumasa Takahashi, Kanagawa, JP;
Satoshi Yamazaki, Kanagawa, JP;
Kiichi Yoshida, Saitama, JP;
Osamu Kohno, Tokyo, JP;
Tohru Enokuma, Tokyo, JP;
Eiichi Tanaka, Kanagawa, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04R / ;
U.S. Cl.
CPC ...
381122 ; 381115 ; 381114 ; 381113 ; 381112 ; 381111 ; 361704 ;
Abstract
A microphone apparatus including a vacuum-tube amplifier amplifying an electric signal converted from an acoustic signal includes a thermo-ionic cooling element having two surfaces, in which a first surface is in contact with the vacuum-tube amplifier for absorbing the heat generated from the vacuum-tube amplifier and the absorbed heat is radiated to the exterior from the second surface.