Patent Number: 7,103,781

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: H04L 9/00 (20060101)

Expiration Date: 9/05/02018