Apparatus for reading an optical radiation-reflecting record...

Details Apparatus for reading an optical radiation-reflecting record... Apparatus for reading an optical radiation-reflecting record...

G - Physics

11

B

352/32.21

G11B 7/00 (2006.01) G11B 7/09 (2006.01)

Patent

CA 1116294

ABSTRACT: An apparatus is described for reading an optical radiation-reflecting information carrier, which apparatus com- prises an opto-electronic focussing error detection system. The radiation path of the read beam which is directed towards the information carrier includes a radiation deflecting element. The focussing beam which is derived from the radiation beam by said element co-operates with two focussing detectors, the difference between the output signals of the focussing detector being determined by the degree of focussing of the read beam on the information structure. -22-

299001

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