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.
Claims11
A method of forming a barcode on an optical disk, said method comprising;
- a) providing the optical disk which has a substrate having a track thereon, a reflective layer disposed over the track and an identifier, the identifier indicating the presence or absence of the barcode on the optical disk;
- and
- b) trimming a part of the reflective layer with laser beam to form the barcode,
- wherein at least a part of the barcode is formed on the track, the substrate of the optical disk has a control data area thereon, said control data area containing physical feature information of the optical disk, and
- the barcode is formed on a region which is located inwardly to the control data area.
An apparatus for forming a barcode on an optical disk which has a substrate having a track thereon, comprising:
- a trimming section for trimming a part of a reflective layer disposed over the track and an identifier of the optical disk, the trimming section having a laser beam to form the barcode, the identifier indicating presence or absence of the barcode on the optical disk;
- wherein at least a part of the barcode is formed on the track, and
- the substrate of the optical disk has a control data area thereon, and the barcode is formed on a region which is located inwardly to the control data area.
Dependencies are inferred from the claim text.