Optical read-out system

Details Optical read-out system Optical read-out system

H - Electricity

04

N

352/32.21

H04N 5/76 (2006.01) G11B 7/005 (2006.01) G11B 7/09 (2006.01) G11B 7/12 (2006.01)

Patent

CA 1068404

OPTICAL READ-OUT SYSTEM Abstract of the Disclosure The invention relates to the optical reading of support comprising a track along which is arranged a series of infor- mation items which optically translate a carrier wave angular- ly modulated by the information. The read-out system in accordance with the invention uses a single lens for pro- jecting a quasi-punctiform spot onto the support ; photodetector means comprising four cells arranged in a square and asym- metrical illumination of the lens ensure detection of the information and simultaneous supply defocussing and tracking deviation signals.

262252

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