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US 2011/0286315 A1Published application
Optical disk, an optical disk barcode forming method, an optical disk reproduction apparatus, a marking forming apparatus, a method of forming a laser marking on an optical disk, and a method of manufacturing an optical disk
AssigneePanasonic Corporation
InventorsYoshiho Gotoh, Mitsuaki Oshima, Shinichi Tanaka, Kenji Koishi, Mitsuro Moriya
Life of this patent
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Abstract
Disclosed is an optical disk barcode forming method wherein, as information to be barcoded, position information for piracy prevention, which is a form of ID, is coded as a barcode and is recorded by laser trimming on a reflective film in a PCA area of an optical disk. When playing back the thus manufactured optical disk on a reproduction apparatus, the barcode data can be played back using the same optical pickup.
Claims2
A method for manufacturing an optical disk comprising the steps of:
- forming a substrate,
- forming a data zone having a track of a spiral shape and including data signal readable by laser light radiation on the substrate, and
- forming a plurality of bars, which is extending in a radial direction and including a disk ID which being unique to the optical disk and used for a copy protection system, on the substrate so that at least a part of the plurality of bars overlap with the track by a Constant Angular Velocity (CAV) mode.
Dependencies are inferred from the claim text.