Positioning control system which generates a servo-error signal

Details Positioning control system which generates a servo-error signal Positioning control system which generates a servo-error signal

1997-10-08

1999-06-01

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4442, G11B 7095

Patent

active

059094150

ABSTRACT:
A positioning control system for performing recording/reproducing operations by irradiating an optical beam to a predetermined position on an optical recording medium, e.g., magneto-optical disk. The control system 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 the detection currents. Preferably, the servo-error signal generating circuit includes at least one division circuit that has two pairs of transistors, two emitters in each pair of transistors being connected together into a common emitter, bias voltages of a direct current type being applied to the respective bases of transistors on one side, and the respective collectors of the transistors on one side being connected to a common connecting portion via resistors. The common connecting portion is connected to a power supply, and the respective bases of transistors on the other side are connected together into a common base. An integrating capacitor which integrates a difference between the current flowing through the common connecting portion and the reference current, is connected to the common base of the transistors on the other side.

REFERENCES:
patent: 4536866 (1985-08-01), Jerome et al.
patent: 5004901 (1991-04-01), Yoshimoto et al.
patent: 5636191 (1997-06-01), Minami et al.

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