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:
Aug. 03, 2010
Filed:
Apr. 28, 2006
Masaya Kuwahara, Nishinomiya, JP;
Masaya Kuwahara, Nishinomiya, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A focal control adjusting method according to the present invention comprises a first step for detecting a focal error signal obtained through condensing and irradiating a light beam on a rotating recording medium, and a second step for setting a focal control gain for controlling a positional shift between a recording surface of the recording medium and the light beam based on the focal error signal detected in the first step, wherein a result obtained by multiplying the position detection signal (sub light beams) by a preset coefficient is added to the position detection signal (main light beam), and a result of the addition is detected as the focal error signal in the first step, and the coefficient is set in accordance with the focal error signal in the first step.