Static information storage and retrieval – Read/write circuit – Optical
Patent
1981-12-21
1984-01-24
Hecker, Stuart N.
Static information storage and retrieval
Read/write circuit
Optical
365127, 369100, G11C 1304
Patent
active
044280696
ABSTRACT:
An apparatus for preformatting each track of an optical disk with spaced header patterns using a plurality of overlapping, individually modulated writing laser beams arranged in a line perpendicular to the track. All of the writing laser beams are derived from a single multi-line laser so as to provide high positioning stability, and adjacent beams are chosen to have different wavelengths in order to prevent the deleterious effects of coherent interference between the overlapping beams. A specific header pattern is provided on a single pass by turning on different ones of the writing beams during specific time periods as each header recording area is traversed. A laser read-after-write beam is additionally provided to permit immediate verification of the recorded header pattern.
REFERENCES:
patent: 4199820 (1980-04-01), Ohtake et al.
patent: 4375088 (1983-02-01), de Haan et al.
Harris, "Optical Tape Read-Only Storage System," IBM Tech. Disc. Bul., vol. 10, No. 12, 5/68, pp. 1868-1869.
Hazel Robert L.
Kammerud John E.
Burroughs Corporation
Cass Nathan
Hecker Stuart N.
Peterson Kevin R.
Rasmussen David G.
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