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:
May. 06, 2008
Filed:
Sep. 01, 2004
Katsuya Watanabe, Nara, JP;
Yuu Okada, Osaka, JP;
Mamoru Shoji, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Abstract
A laser power control apparatus is for use in an optical disk apparatus for recording information on an optical disk having at least a first layer and a second layer. The laser power control apparatus includes a power control section for controlling a laser element such that a power of a laser beam approaches a control target level; a change detection section for detecting that a recording condition for the optical disk has been changed; and a power adjustment section for adjusting the power of the laser beam for a recording film of the first layer, in accordance with an output from the change detection section. The power adjustment section determines the power of the laser beam for a recording film of the second layer, based on the power of the laser beam which has been adjusted for the recording film of the first layer.