Patent Number: 6,298,138

Title: 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

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.

Inventors: Gotoh; Yoshiho (Osaka, JP), Oshima; Mitsuaki (Kyoto, JP), Tanaka; Shinichi (Kyoto, JP), Koishi; Kenji (Sanda, JP), Moriya; Mitsuro (Ikoma, JP)

Assignee: Matsushita Electric Industrial Co., Ltd.

International Classification: G06K 1/12 (20060101); G06K 1/00 (20060101); G11B 20/10 (20060101); G11B 20/12 (20060101); G11B 20/00 (20060101); G11B 23/30 (20060101); G11B 23/00 (20060101); G11B 27/24 (20060101); G11B 19/12 (20060101); G11B 23/28 (20060101); G11B 27/19 (20060101); G11B 19/04 (20060101); G11B 23/38 (20060101); G06K 19/14 (20060101); G06K 19/08 (20060101); G11B 7/007 (20060101); G06K 19/06 (20060101); G06K 19/04 (20060101); G11B 7/26 (20060101); G11B 13/00 (20060101); G11B 7/0037 (20060101); G11B 20/18 (20060101); G11B 20/14 (20060101); G11B 7/005 (20060101); G11B 13/04 (20060101); G11B 5/86 (20060101); G11B 7/00 (20060101); H04N 007/167 ()

Expiration Date: 10/02/2018