Method and apparatus for effecting at least one of tracking and

Details Method and apparatus for effecting at least one of tracking and Method and apparatus for effecting at least one of tracking and

1990-01-23

1992-09-08

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, 369 4427, G11B 700

Patent

active

051464420

ABSTRACT:
In an optical information recording and/or reproducing apparatus, tracking and/or focusing error signals from relected light which are caused when a light spot is irradiated onto an optical recording medium are detected. Tracking and/or focusing servo circuits in the apparatus cause an objective lens to follow the medium on the basis of the result of the detection of the tracking and/or focusing error signals. When it is detected that the tracking and/or focusing error signals have reached a target value which is previously set to exceed a zero-cross point or a zero-cross level at the signal level, the tracking and/or focusing servo circuit is closed and the tracking and/or focusing servo is pulled in.

REFERENCES:
patent: 4817069 (1989-03-01), Shigemori
patent: 4975895 (1990-12-01), Yanagi

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