Positioning control system having an optical beam and a servo-er

Details Positioning control system having an optical beam and a servo-er Positioning control system having an optical beam and a servo-er

1996-09-23

1998-09-22

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, G11B 7095

Patent

active

058125035

ABSTRACT:
A positioning control system for performing recording/reproducing operations by irradiating an optical beam on a predetermined position on an optically recording medium includes a photo-detector constituted by at least two-divisional units and a servo-error signal generating circuit which can generate at least one servo-error signal in accordance with a difference between detection currents measured at the collectors of selected transistors in two pairs of transistors.

REFERENCES:
patent: 5636191 (1997-06-01), Minami et al.

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