Optical recording and reproducing apparatus

Details Optical recording and reproducing apparatus Optical recording and reproducing apparatus

1992-09-11

1993-06-08

Brier, Jeffery A.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4411, G11B 700

Patent

active

052185869

ABSTRACT:
An optical recording and reproducing apparatus includes a light source for generating a parallel beam. A movable optical system condenses the parallel beam from the light source on the disk, splits the beam reflected by the disk into a first and a second beam, spatially inverts the second beam, and moves in the radial direction of the disk. A first split-beam detecting device has two light receiving surfaces which receive the first beam. A second split-beam detecting device has two light receiving surfaces which receive the second beam inverted in the movable optical system. A control device performs tracking control by moving the movable optical system in the radial direction of the disk in accordance with detection signals output from the first and second split-beam detecting devices.

REFERENCES:
patent: 4363961 (1982-12-01), Okada et al.
patent: 4712887 (1987-12-01), Baer

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