Optical disk retrieval methods, media and systems employing digi

Details Optical disk retrieval methods, media and systems employing digi Optical disk retrieval methods, media and systems employing digi

1981-10-26

1984-10-02

Cardillo, Jr., Raymond F.

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

360 42, 369109, 369275, G11B 700

Patent

active

044751834

ABSTRACT:
High information density retrieval method and system which employ the scanning of an optical disk, having a thermally-deformable record layer overlying a reflective support, with a read light beam. The optical disk tracks contain information in the form of variable-width, approximately 0.5.pi. phase-depth, pit regions interleaved between nominal thickness land regions. The pits have varying track lengths within a pit-length range constituting a disk fractional band-width of greater than 4.0 and read light reflected from the tracks is split-detected. The split-detected, electrical analog signal is peak-detected to reconstruct recorded digital data on the disk.

REFERENCES:
patent: 3810232 (1974-05-01), Aghazadeh
patent: 4065786 (1977-12-01), Stewart
patent: 4238843 (1980-12-01), Carasso et al.
patent: 4375088 (1983-02-01), de Haan et al.
"Optical Readout of RCA VideoDisc,"RCA Review, vol. 39, Sep. 1978, pp. 392-410.

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