Apparatus for reading an optical radiation-reflecting informatio

Details Apparatus for reading an optical radiation-reflecting informatio Apparatus for reading an optical radiation-reflecting informatio

1977-09-19

1981-05-26

Segal, Robert

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

3581285, H04N 576, G01J 136

Patent

active

042700450

ABSTRACT:
An apparatus as described for reading an optical radiation-reflecting information carrier, which apparatus comprises an opto-electronic focussing error detection system with two focussing detectors. The path of the read beam which has been reflected by the information carrier and which originates from the read spot includes a single radiation-deflecting element, in such a way that the radiation which is incident on this element is deflected towards the focussing detectors.

REFERENCES:
patent: 3974327 (1976-08-01), Dijk
patent: 3992575 (1976-11-01), Velzel et al.
patent: 4010317 (1977-03-01), Bouwhuis
patent: 4135207 (1979-01-01), Greve et al.

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