Optical information recording and reproducing apparatus with tra

Details Optical information recording and reproducing apparatus with tra Optical information recording and reproducing apparatus with tra

1987-07-09

1989-07-11

Sikes, William L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700, G11B 2110

Patent

active

048478229

ABSTRACT:
An optical information recording and reproducing apparatus of a sampling servo system which effects the tracking by holding the differential output of the reproduced signals of tracking pits that are wobbled toward the right and left relative to the track of the optical disk. Reproduced signals of a plurality of pits arranged maintaining a distance on the track and wobbled toward the right or left in a servo signal region, are compared with each other to detect any abnormal condition in the tracking pits. When the abnormal condition is detected, the tracking signal that is sampled is not used, but instead the tracking signal sampled under the normal condition is continuously used to perform the tracking control.

REFERENCES:
patent: 4761773 (1988-08-01), Okada et al.

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