Optical recording medium and playback method for the same

Details Optical recording medium and playback method for the same Optical recording medium and playback method for the same

G - Physics

11

B

G11B 7/007 (2006.01) G11B 7/005 (2006.01) G11B 20/12 (2006.01) G11B 20/14 (2006.01) G11B 23/00 (2006.01) G11B 23/28 (2006.01) G11B 23/30 (2006.01)

Patent

CA 2475438

An optical recording medium has prepits or pregrooves on tracks in a BCA region (101) where BCA marks (104) or other barcode-shaped marks are recorded, and the track pitch of these tracks is greater than the track pitch of a track in a read-only area (102) or read/write area used to record the actual user data or disc information. Tracking in BCA is enabled by forming prepits or pregrooves in the BCA. By making the track pitch in the BCA sufficiently wider than the track pitch in the read-only area (102) and other areas in an optical disc it is difficult to uniformly modify all of the barcode-shaped BCA marks (104) in the BCA (101). A method of reading information from the medium is also disclosed.

L'invention concerne un disque optique ou un autre support d'enregistrement optique permettant de lire des marques BCA sous forme de code barre dans une zone de séparation de rafales (BCA) avec suivi, tout en rendant difficile l'altération des marques BCA. Le disque optique (100) présente une première zone (102) contenant des pistes au niveau d'une premier pas transversal (d2), et une seconde zone (101) contenant des pistes au niveau d'un second pas transversal (d1). Les marques (104) sous forme de code barre sont enregistrées dans la seconde zone, et le second pas transversal est plus large que le premier pas transversal.

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