G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.21
G11B 7/095 (2006.01) G11B 7/085 (2006.01) G11B 7/09 (2006.01)
Patent
CA 1200608
ABSTRACT OF THE DISCLOSURE OPTICAL MEMORY SYSTEM HAVING IMPROVED POSITIONING AND FOCUSING CONTROL CIRCUITRY An optical storage system employing a laser beam which is directed and focused onto an optical disk for reading and/or writing data in a track of the disk. Positioning control is achieved by providing for track following and track seeking using a plurality of interactive servo-loops. Proper focusing is maintained using focusing control circuitry which produces a focus error signal that is applied to a focus motor. This focusing control circuitry is able to return the objective lens assembly to its in-focus position so long as the objective lens assembly remains within a predetermined capture range. In the event that the objective lens assembly is outside of this capture range, a waveform generator is enabled which produces a correction signal that causes the focus motor to move the objective lens assembly back within the capture range with a velocity and for a time period sufficient to permit the focusing control circuitry to regain control and return the objective lens assembly to its in-focus position.
428453
Hsieh Der-Chang
Labudde Edward V.
Burroughs Corporation (delaware)
R. William Wray & Associates
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