G - Physics – 11 – B
Patent
G - Physics
11
B
352/32, 352/32.2
G11B 7/00 (2006.01) G02B 7/04 (2006.01)
Patent
CA 1182908
OPTICAL TRACK SEGMENT INTERCEPT APPARATUS ABSTRACT A track intercept apparatus is described for use in an optical playback machine which plays back data recorded on an optical record in track segments. The apparatus deflects the scanning light beam of such machine so that the light beam intercepts each selected track segment properly when the scan is initiated. A track intercept control circuit is employed having storage means for storage of variable values of track alignment data, adjust means for producing an adjustment signal corresponding to the stored data which is applied to a light beam deflection means, and tim- ing means for controlling gating circuity and for coordinating events within the circuit with the operation of the playback machine as a whole. One embodiment of the invention includes a circuit which compensates for track-following corrections made during scanning by returning the scanning light beam to a stored starting position. Another embodiment has a circuit for electronically align- ing the scanner optics. A third embodiment includes a circuit for using data track addresses to direct the scanning light beam to the correct track. A fourth embodiment has a circuit which combines the first three embodiments.
387429
Digital Recording Corporation
Oyen Wiggs Green & Mutala
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