Servo system for optical recording/reproducing drive

Details Servo system for optical recording/reproducing drive Servo system for optical recording/reproducing drive

1991-05-21

1992-10-13

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 32, 369 33, G11B 700

Patent

active

051557169

ABSTRACT:
A digital servo system for use in an optical recording/reproducing apparatus equipped with an optical system for illuminating an optical recording medium with a light beam to record and reproduce an information signal on and from the optical recording medium, the servo system being for more accurately performing a tracking and focusing control of the light beam with respect to the optical recording medium. The servo system is provided with a plurality of photodetectors to obtain a servo error signal which is in turn supplied to an attenuator and then supplied to an analog-to-digital converter to be digitized so as to constitute a digital filter. The servo system is arranged so as to set the attenuation factor of the attenuator so that the input signal of the analog-to-digital converter is kept in a predetermined range. This permits the tracking and focusing control with a high precision and further allows an AGC amplifier having a high-speed automatic gain-controllable function to be arranged to be digitally controllable.

REFERENCES:
patent: 4485414 (1984-11-01), Baker
patent: 4651314 (1987-03-01), Yoshikawa et al.

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