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. 06, 2007
Filed:
Jan. 09, 2002
Shigekazu Minechika, Osaka, JP;
Hideaki Yano, Osaka, JP;
Keiji Nagata, Osaka, JP;
Yoshihiro Aoi, Nara, JP;
Ichizo Sakamoto, Hyogo, JP;
Kenji Asano, Gifu, JP;
Tadashi Okajima, Osaka, JP;
Shigekazu Minechika, Osaka, JP;
Hideaki Yano, Osaka, JP;
Keiji Nagata, Osaka, JP;
Yoshihiro Aoi, Nara, JP;
Ichizo Sakamoto, Hyogo, JP;
Kenji Asano, Gifu, JP;
Tadashi Okajima, Osaka, JP;
Sanyo Electric Co., Ltd., Moriguchi, JP;
Abstract
A disc apparatus () includes an optical lens (). A laser beam is irradiated onto a recording surface of the magneto-optical disc () through the optical lens (), and a TE signal or an RF signal is detected on the basis of the laser beam reflected by the recording surface. Herein, an MPU () replaces the optical lens () in an optical axis direction, and a TE signal detection circuit () or an RF signal detection circuit () detects the TE signal or the RF signal at each of lens positions. A laser power is adjusted by the MPU () such that amplitude of each of the TE signal or the RF signal detected is below a saturation value. When a parameter is adjusted, a position of the optical lens () is controlled such that the amplitude of the TE signal or the RF signal detected thereafter is maximized.