Optical reading apparatus

Details Optical reading apparatus Optical reading apparatus

G - Physics

11

B

352/32.2

G11B 11/18 (2006.01) G11B 7/09 (2006.01) G11B 7/12 (2006.01)

Patent

CA 1098620

S0873 (S76P124) OPTICAL READING APPARATUS ABSTRACT OF THE DISCLOSURE An apparatus for optically reading or playing-back video or other signal information recorded as pits or other variations in a record track on a reflective record medium surface employs a polarized beam splitter by which a laser light beam is split into first and second polarized light beams which are respectively polarized in different polarization directions. The first polarized light beam is directed in a respective optical path so as to be projected against the record track on the record medium surface and reflected from the latter to a photo-detector or -sensor developing an output representing the recorded signal information, while the second polarized light beam is directed, in an optical path spaced from that of the first polarized light beam, so as to be projected against the record medium surface and reflected from the latter to control a servo-mechanism by which, for example, proper focusing or positioning of the first polarized light beam in respect to the record track is maintained.

266078

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