Process and optical device for generating signals controlling th

Details Process and optical device for generating signals controlling th Process and optical device for generating signals controlling th

1983-03-09

1985-12-31

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 45, G11B 700

Patent

active

045625646

ABSTRACT:
The process makes it possible to generate on the basis of discrete preetching elements or flags, the radial tracking error and/or focusing error signals. The flags comprise portions displaced with respect to the mean axis of the tracks to be followed. According to a first variant, each track comprises portions displaced on either side of the axis. According to a second variant the flags comprise portions alternately displaced to one and then the other side thereof. In response to the passages of these portions, windows are generated and the pulses supplied by the photodetectors of the interaction of these portions on the focused scan beam are compared between successive windows.

REFERENCES:
patent: 3919697 (1975-11-01), Walker
patent: 4443870 (1984-04-01), Hazel et al.

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