Optical recording and reproducing apparatus using a plurality of

Details Optical recording and reproducing apparatus using a plurality of Optical recording and reproducing apparatus using a plurality of

1994-11-23

1997-01-14

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4428, 369 4432, G11B 7095

Patent

active

055947115

ABSTRACT:
An optical apparatus includes a focuser for focusing and imaging a beam passing through an imaging optical system as a plurality of light spots, for recording and reproducing information on the same or adjacent tracks on a rotating optical recording medium having substantially concentric tracks; an adjuster for adjusting positions of first and second light spots with respect to a predetermined track; a tracker for positioning the first light spot with respect to an arbitrary track, using return light thereof from the medium, while keeping the relative positional relation of the light spots relative to the predetermined track; a moving device for moving the light spots in parallel with the radial direction of the medium, and a setter for setting .DELTA., P, R1, R2, and d to satisfy:

REFERENCES:
patent: 4853917 (1989-08-01), Koyama et al.
patent: 5073884 (1991-12-01), Kobayashi
patent: 5130965 (1992-07-01), Karaki et al.
patent: 5138592 (1992-08-01), Fujita
patent: 5386404 (1995-01-01), Koyama

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