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
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsYoshiho Gotoh, Mitsuaki Oshima, Shinichi Tanaka, Kenji Koishi, Mitsuro Moriya
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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.
Claims3
Reproduction circuit in an optical disk reproduction apparatus for use with a disk on which data is recorded, wherein in a prescribed region of said disk, an identifier is provided for indicating whether a barcode-like mark is present or not on said optical disk, said identifier and said barcode-like mark are in respectively different locations on said disk, said barcode-like mark disposed in a circumferential direction, and said barcode-like mark having a plurality of bars, each of said bars extending in a radial direction, said prescribed region is included in a control data area in which physical feature information regarding said optical disk is recorded,
- said reproduction circuit comprising:
- input means receiving reproduced signals from said optical disk,
- demodulation means demodulating said barcode-like mark from said received reproduced signals by using reverse conversion of phase encoding method,
- identifier detection means detecting whether said identifier is 0 or 1 in the received reproduced signals, and
- output means outputting the value of said identifier to controlling means of said optical disk reproduction apparatus.
Dependencies are inferred from the claim text.