Optical information recording/reproducing method and apparatus f

Details Optical information recording/reproducing method and apparatus f Optical information recording/reproducing method and apparatus f

1997-06-06

1999-06-29

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

235454, 369 4437, 369 58, G11B 709

Patent

active

059177900

ABSTRACT:
Different tracks on an optical information recording medium are irradiated with first and second light spots for auto-tracking. The light of the first light spot via the recording medium is detected to produce a first detection signal and light of the second light spot via the recording medium is also detected to produce a second detection signal. On the basis of a difference between the first and second detection signals, a signal used for performing tracking control of a third light spot for recording or reproducing information is generated. When recording or reproduction of information is effected on/from one of a first recording medium having a track pitch P.sub.1 and a second recording medium having a track pitch P.sub.2 and the first and second recording media satisfy a relation P.sub.1 -P.sub.2 =d (d is the width of the tracking track) while executing auto-tracking control, a relationship of a direction of movement of the third light spot in a track intersecting direction with respect to a polarity of a signal obtained by subtracting the second detection signal from the first detection signal between the first and second recording media is inverted.

REFERENCES:
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Patent Abstracts of Japan, Kokai No. 57-50330, vol. 6, No. 125, Jul. 1982.

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