Dynamic information storage or retrieval – Systems having plural physically distinct independent tracks...
Patent
1981-10-30
1984-02-14
Psitos, Aristotelis M.
Dynamic information storage or retrieval
Systems having plural physically distinct independent tracks...
369111, 369112, G11B 374, G11B 700
Patent
active
044320850
ABSTRACT:
A wideband optical disc data record/playback apparatus includes apparatus for splitting the output light beam of a single laser into a plurality of read and record light beams. The read and record beams are directed along a read light path including a beam splitter and a record light path including a modulator and a beam splitter respectively. In the apparatus, the read and record light beams are recombined and directed along a common light path to an objective lens where the beams are focused on a surface of a record medium as diffraction limited spots. A dual-input lens beam-expansion telescope is utilized with the beam combiner optics to provide expanded light beams which fill the entrance aperture of the objective lens.
REFERENCES:
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patent: 4044378 (1977-08-01), Laub
patent: 4094010 (1978-06-01), Pepperl et al.
patent: 4097895 (1978-06-01), Spong
patent: 4167024 (1979-09-01), Hamisch
patent: 4199217 (1980-04-01), Rogers
patent: 4222071 (1980-09-01), Bell et al.
patent: 4344164 (1982-08-01), Bricot et al.
Allee Genevieve L.
Reno Charles W.
Maginniss Christopher L.
Psitos Aristotelis M.
RCA Corporation
Tripoli Joseph S.
Troike Robert L.
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