Dynamic information storage or retrieval – Systems having plural physically distinct independent tracks... – Continuous consecutive storage or retrieval of interrupted...
Patent
1987-10-05
1989-03-21
McElheny, Jr., Donald
Dynamic information storage or retrieval
Systems having plural physically distinct independent tracks...
Continuous consecutive storage or retrieval of interrupted...
G11B 712
Patent
active
048150673
ABSTRACT:
A helically scanned optical tape recording and replay system has a rotating drum with a galvanometer mirror for controlling the tracking of a number of write and read light beams during recording and replay. Dynamic focussing of the beams on the recording medium is controlled by means of a voice-coil actuator operating on a lens situated outside the drum. An optical rotator is provided through which the write and read beams pass following beam combinations, the optical rotator being driven by a motor to rotate at half the rotational velocity of the drum, and thereby present an image to the optical tape which rotates synchronously with the drum.
REFERENCES:
patent: 3314075 (1967-04-01), Becker et al.
patent: 4525828 (1985-06-01), Higashiyama et al.
patent: 4633455 (1986-12-01), Hudson
patent: 4669070 (1986-05-01), Bell
"Principles of Optical Disc Systems", by G. Bouwhuis, et al., Adam Hilger Ltd., 1985, pp. 136-143.
Baker Brian J.
Claes Paul E.
Newell John C.
Webster Elizabeth A.
McElheny Jr. Donald
Thorn EMI plc.
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