Focusing control system for use in an information recording and

Details Focusing control system for use in an information recording and Focusing control system for use in an information recording and

1992-11-06

1994-09-13

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4436, 369 54, 369 4434, G11B 709

Patent

active

053475020

ABSTRACT:
In an information recording and reproducing apparatus, a focusing control system performs a focusing control operation wherein a beam for reproducing signals from a recording surface of a recording medium is focused on the recording surface of the recording medium. The focusing control system includes a differential amplifier for outputting a signal indicating an amount of deviation between the position of a point (a focus of the beam) on which the beam is focused and that of the recording surface of the recording medium, an amplifier for amplifying an output signal from the differential amplifier, and an A/D converter for converting an output signal from the amplifier to a digital signal. The system further includes a focusing control driver for moving the focus of the beam in a direction perpendicular to the recording surface of the recording medium, and a computer or processor for controlling the focusing control driver in response to an output signal from the A/D converter so that the focus of the beam may be positioned appropriately on the recording surface of the recording medium. An amplification factor of the amplifier is reduced during a given period after the focusing control operation is triggered or when the level of the signal from the differential amplifier deviates from a predetermined range.

REFERENCES:
patent: 4344165 (1992-08-01), Akiyama
patent: 4475182 (1984-10-01), Hosaka
patent: 4878211 (1989-10-01), Suzuki et al.
patent: 4942564 (1990-07-01), Hofer et al.
patent: 5050149 (1991-09-01), Ishii et al.

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