Optical disc reproducing apparatus

Details Optical disc reproducing apparatus Optical disc reproducing apparatus

1982-04-16

1985-02-05

Faber, Alan

Facsimile and static presentation processing

Facsimile

Recording apparatus

360 101, 369 44, 369111, 250202, H04N 585, G11B 2110

Patent

active

044981104

ABSTRACT:
In an optical video disc player, a still picture mode reproduction is effected by returning a light spot on an optical video disc by one track pitch in its radial direction after each revolution of the disc. The displacement of the light spot is carried out by supplying a returning pulse to a moving coil coupled with an objective lens to move the objective lens in a disc radial direction. In order to cause the light spot to trace a track precisely, a tracking error due to an eccentricity of the disc is detected and the objective lens is moved in the disc radial direction in accordance with the detected tracking error. An amplitude of the returning pulse is modulated in accordance with a velocity component of the displacement of the objective lens under the tracking condition, so that the light spot is returned accurately by one track pitch.

REFERENCES:
patent: 3854015 (1974-12-01), Janssen
patent: 3911211 (1975-10-01), Rennick

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