Solid state electro-optical track follower array

Details Solid state electro-optical track follower array Solid state electro-optical track follower array

G - Physics

11

B

352/32.2

G11B 7/00 (2006.01) G11B 7/09 (2006.01) G11B 7/12 (2006.01) G11B 21/00 (2006.01) H01L 27/144 (2006.01)

Patent

CA 1145463

ABSTRACT Reflected light from the record in a optical disk player is directed at a string of photo sensitive diodes. Two adjacent diodes of this string of diodes receive light from a selected portion of the track on the disk. The outputs of these two adjacent diodes are summed together to generate the output signal for the optical disk player. The outputs of the two diodes are also subtracted from one another to generate a differ- ential signal for tracking purposes. The magnitude of this differential signal is a measure of the relative magnitudes of the signals on the two adjacent diodes and therefore is one indication of how much of the light from the selected portion of the track reaches each of the diodes. When this differential output becomes larger than a preselected value, decode circuitry responds by changing the combination of adjacent diodes in the string to generate the video output signal and the difference signals. PO9-78-014

347801

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