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. 19, 2013
Filed:
Sep. 14, 2010
Hiroaki Shigematsu, Osaka, JP;
Harumitsu Miyashita, Osaka, JP;
Yoshiyasu Nakayama, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
The present invention provides a method for writing data on a multilayer optical disc with N information storage layers (where N is an integer and N≧2). The kdeepest one (where k is an integer and 1≦k≦N) of the storage layers of the multilayer optical disc is called a kinformation storage layer. The method includes the steps of: (A) finding the number of layers that an optical disc loaded into an optical disc drive has (disc type recognition); if the number of layers is X (which is an integer and X≧2), (B) tentatively writing data on a test write area of an minformation storage layer (where m is an integer and 1≦m≦X−1), thereby determining a provisional initial optical recording power (performing OPC); (C) choosing an appropriate correction coefficient according to the level of a target layer, on which data needs to be written, and correcting the provisional initial optical recording power based on the correction coefficient chosen, thereby determining an initial optical recording power; and (D) starting writing the data on the target layer with the initial optical recording power.