Method and apparatus for producing an accurate error signal in a

Details Method and apparatus for producing an accurate error signal in a Method and apparatus for producing an accurate error signal in a

1988-08-01

1991-04-09

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4436, G11B 700

Patent

active

050070380

ABSTRACT:
When recording, reproducing or erasing data signal by illuminating a recording medium surface with a condensed light spot, a tracking sensor signal or a focusing sensor signal is detected from light reflected from the recording medium surface. The detected signal is subjected to current-to-voltage conversion, and the current-to-voltage conversion gain is switched by estimating reflected light power from the recording medium surface.

REFERENCES:
patent: 4663749 (1987-05-01), Bierhoff et al.
patent: 4796250 (1989-01-01), Kobayashi et al.

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