Tracking apparatus having movable and stationary parts

Details Tracking apparatus having movable and stationary parts Tracking apparatus having movable and stationary parts

1989-12-29

1991-12-17

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4441, G11B 700

Patent

active

050738844

ABSTRACT:
A tracking control apparatus for use with an optical recording/reproducing apparatus includes a stationary optical section provided with a laser light source, a movable optical section provided with an objective lens by means of which three laser beams emanating from the laser light source are directed onto an optical disk, and a plurality of photodetectors having light receiving surfaces each divided into at least two segments adapted to receive the three reflected laser beams from the optical disk. A tracking control signal computing device taken the difference of detection outputs from the light receiving surfaces of said photodetectors to produce plural tracking error signals and divides the tracking error signals by the total light quantities received by the photodetectors for normalizing the tracking error signals to derive a tracking signal.

REFERENCES:
patent: 4598393 (1986-07-01), Pierce et al.
patent: 4977552 (1990-12-01), Gotoh

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