Back to results
US 8,472,291 B2Granted
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
Estimating the term…
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 spiral track formed by pits and spaces, 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 by a Constant Angular Velocity (CAV) mode;
- wherein the plurality of bars overlaps with a part of spiral track, and pits and spaces are formed in the part of the spiral track.
1 more element
Dependencies are inferred from the claim text.