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:
Jan. 18, 2011
Filed:
Dec. 23, 2005
Hideharu Eguchi, Yokosuka, JP;
Yasuhiko Teranishi, Yokohama, JP;
Hideharu Eguchi, Yokosuka, JP;
Yasuhiko Teranishi, Yokohama, JP;
Victor Company of Japan, Ltd., Yokohama, JP;
Abstract
In cases where forthcoming recording of information on a multi-layer optical disc is first time one, test signals are recorded on trial write areas in first and second recording layers before being reproduced. First-time optimum recording powers of the laser beam for the respective first and second recording layers are decided in response to the reproduced test signals. In cases where forthcoming recording is not first time one, the test signals are recorded on only the trial write area in the first recording layer before being reproduced. A new optimum recording power for the first recording layer is described in response to the reproduced test signals. Thereafter, a new optimum recording power for the second recording layer is calculated from (1) the new optimum recording power for the first recording layer and (2) the ratio between the first-time optimum recording powers for the first and second recording layers.