Optical disk and method for reproducing reference signal therefr

Details Optical disk and method for reproducing reference signal therefr Optical disk and method for reproducing reference signal therefr

1985-08-23

1987-12-08

Faber, Alan

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369275, 369 47, 369111, 369 54, G11B 700, G11B 2710

Patent

active

047122048

ABSTRACT:
In an optical disk having grooves, pits representing reference signals in header regions of the grooves are disposed to be spaced apart from each other in a longitudinal direction of the groove to suppress undesirable interference or crosstalk of the reference signals in adjacent V-grooves. In the reproduction of such reference signals, two laser beam spots are respectively irradiated on the first and second oblique surface tracks in the V-groove. Two electric signals made by detecting the light reflected from the spots are examined to determine whether they are in coincidence. When coincidence is confirmed, the signals are used as valid reference signals.

REFERENCES:
patent: 4006292 (1977-02-01), Schaefer
patent: 4015285 (1977-03-01), Romeas
patent: 4142209 (1979-02-01), Hedlund
patent: 4550347 (1985-10-01), Nakamuta
R. Imanaka et al., "Optical Disc Memory System", Proceeding of SPIE, vol. 421-09, Jun. 1983.
G. Guarracini et al., "Micromachining Video Disc Grooves and Signals, pp. 67-83, vol. 43, Mar. 1982, RCA Review.

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