Optical information recording medium with phase grooves in land

Details Optical information recording medium with phase grooves in land Optical information recording medium with phase grooves in land

1993-04-08

1994-09-06

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428913, 430270, 430945, 369288, 346 76L, 3461531, B32B 300

Patent

active

053446836

ABSTRACT:
An optical information recording medium for a land recording method in which information recording pits are formed in a recording layer provided in a land portion between adjacent guide grooves with the application of a laser beam to the recording layer, is composed of a substrate and a recording layer formed thereon. The substrate includes preformed prepits thereon as preformat information in a space along a track center, which includes flag marks and preformed phase grooves, and the decrease in the output of Rf signals generated by the phase grooves is smaller than a half of the amplitude of Rf signals detected by the presence or absence of the prepits.

REFERENCES:
patent: 4423502 (1983-12-01), Dil
patent: 4947384 (1990-08-01), Suzuki et al.
patent: 4956214 (1990-09-01), Imataki et al.

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