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. 04, 2007
Filed:
Apr. 25, 2003
Yasufumi Takasugi, Tokyo, JP;
Kazuo Fukunaga, Tokyo, JP;
Toshikazu Hosobuchi, Tokyo, JP;
Takashi Namioka, Tokyo, JP;
Giichi Shibuya, Tokyo, JP;
Hideki Hirata, Tokyo, JP;
Kazuki Suzawa, Tokyo, JP;
Yasufumi Takasugi, Tokyo, JP;
Kazuo Fukunaga, Tokyo, JP;
Toshikazu Hosobuchi, Tokyo, JP;
Takashi Namioka, Tokyo, JP;
Giichi Shibuya, Tokyo, JP;
Hideki Hirata, Tokyo, JP;
Kazuki Suzawa, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
It is an object of the present invention is to provide an apparatus for discriminating an optical recording medium and a method for discriminating an optical recording medium which can reliably discriminate the kind of an optical recording medium even in the case where the optical recording medium to be discriminated is formed with periodical undulation in the circumferential direction thereof. The apparatus for discriminating an optical recording medium according to the present invention includes a first electrode, a second electrode, an alternate current signal generation circuitfor applying an alternate current A to the first electrode, a detection circuitfor detecting a level of an alternate current B appearing at the second electrode, and a control circuitfor controlling the operations of the alternate current signal generation circuitand the detection circuit