Optical disk drive equipped with waveform equalizer and focus ad

Details Optical disk drive equipped with waveform equalizer and focus ad Optical disk drive equipped with waveform equalizer and focus ad

1997-06-16

1998-12-08

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, 369 4428, G11B 709

Patent

active

058480366

ABSTRACT:
An optical disk drive for reading information recorded on a recording surface of an optical disk medium using an optical head to generate a read-out signal, comprises focus position control means for controlling a focal point of a light beam emitted from the optical head so that it is positioned on a focus position that is set as a position in the vicinity of the recording surface of the optical disk medium; equalizing means for performing waveform equalization using a set equalization quantity, to the read-out signal generated by the optical head, and outputting an equalization signal; jitter measuring means for measuring a jitter of the equalization signal output from the equalizing means; and optimum value searching means for searching for a focus position and an equalization quantity, at which the jitter is minimized. In this optical disk drive, for both the focus position and the equalization quantity, the jitter minimized point can be searched accurately.

REFERENCES:
patent: 5663942 (1997-09-01), Ishibashi et al.
patent: 5751675 (1998-05-01), Tsutsui et al.

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