Focused-spot-position detection device for optical information r

Details Focused-spot-position detection device for optical information r Focused-spot-position detection device for optical information r

1989-12-04

1991-03-12

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

049998269

ABSTRACT:
The present invention has an object to provide a focus sensor or tracking sensor for an optical recording and reproducing device, which has a simplified optical system whose adjustment is much facilitated. The operational principle of this device is to produce a focusing error signal or tracking error signal by vibrating light spot on an optical disc with a small amplitude to scan interference fringes produced in the far field on an optical disc on the basis of a periodicity of information tracks of the optical disc and processing output signals of an optical sensor arranged in the far field.

REFERENCES:
patent: 4888757 (1989-12-01), Fujita

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