Concurrent recording and reproducing optical disc and optical he

Details Concurrent recording and reproducing optical disc and optical he Concurrent recording and reproducing optical disc and optical he

1993-06-28

1995-02-21

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Systems having plural physically distinct independent tracks...

369 15, 369120, G11B 1304

Patent

active

053922719

ABSTRACT:
A concurrent recording and reproducing optical disc has a magneto-optical medium film coated on a ROM disc having rows of pits. The magneto-optical film is arranged by a predetermined interval between the two adjacent rows of the pit rows. The predetermined interval is determined by a dark Airy disc circle band of a beam spot obtained by focusing a light beam on the concurrent recording and reproducing optical disc. Preferably, two light beams are focused on the optical disc to provide first and second beam spots. The first beam spot is focused on one of the pit rows, and the second beam spot is focused on an area between two selected pit rows.

REFERENCES:
patent: 5031162 (1991-07-01), Morimoto et al.
patent: 5150339 (1992-09-01), Ueda et al.
patent: 5166913 (1992-11-01), Ichiyama
patent: 5173886 (1992-12-01), Satoh et al.
patent: 5241531 (1993-08-01), Ohno et al.
patent: 5287335 (1994-02-01), Ichiyama

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