Optical recording medium permitting detection of identification

Details Optical recording medium permitting detection of identification Optical recording medium permitting detection of identification

1995-07-18

1997-04-01

Ryan, Patrick

Stock material or miscellaneous articles

Circular sheet or circular blank

428 642, 428 644, 428 645, 428 648, 428913, 43027012, 43027013, 430945, 3692751, 3692753, 3692754, 369277, 369283, 369288, B32B 300

Patent

active

056163908

ABSTRACT:
An optical information recording medium is configured so that grooves and lands formed spirally or concentrically on a disk substrate are used as recording tracks. Identification signal areas are provided in which identification signals including positional information are formed in advance on the disk substrate. Information signal areas are formed separately from the identification signal areas so that information signals are recorded by irradiation with a light beam. The identification signals are formed on the grooves and lands not independently of each other, but so that each identification signal is formed so as to be shared by a respective adjacent groove and land. The period of arrangement of the identification signals in the radial direction of the recording tracks is twice the period of the recording tracks and crosstalk at the time of reproduction of the identification signals is suppressed. Accordingly, the identification signals can be reproduced well even where each of the identification signals is recorded both on a land and on a groove.

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Murayama et al., "Optical Disk Technique", Radio Gijutsusha, Third Edition, pp. 163-164.

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