System for optically recording information

Details System for optically recording information System for optically recording information

1983-03-29

1985-10-29

McElheny, Jr., Donald

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

G11B 700, G11B 2110

Patent

active

045503940

ABSTRACT:
An optical information recording system in which predetermined information is recorded by a first laser light beam on a recording medium along a guiding groove previously formed in the recording medium. Second and third laser light beams are projected onto the recording medium at positions deviated from the center of the guiding groove and preceding and succeeding to the first laser beam. A pattern in which no mutual interference of information to be recorded by the first laser beam is present is detected from an information signal which modulates the intensity of the first laser light beam. A difference is determined between the quantity of light reflected upon illumination of the recorded pattern by the second laser beam chronographically succeeding to the first laser beam and the quantity of light reflected upon illumination by the third laser beam. The position of the first laser beam is controlled on the basis of the thus determined difference for effecting an information tracking operation with improved accuracy.

REFERENCES:
patent: 4136362 (1979-01-01), Naruse et al.
patent: 4243850 (1981-01-01), Edwards
patent: 4298974 (1981-11-01), Tsunoda et al.
patent: 4414655 (1983-11-01), Shoji et al.
patent: 4423495 (1983-12-01), Musha et al.
patent: 4443870 (1984-04-01), Hazel et al.

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