G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2
G11B 7/09 (2006.01) G11B 7/095 (2006.01)
Patent
CA 1255385
ABSTRACT An optical storage apparatus having an improved track servo means substantially eliminating "beam shift" effect of an laser beam is disclosed. The track servo system comprises an objective lens transferrable in a tracking direction in parallel with the relevant rotating optical disk and a tilting mirror for deflecting the laser beam for tracking. Tracking of the laser beam is accomplished by controlling both of lens transfer and mirror rotation in co-operation to center the laser beam on the target track. Simultaneously, the laser beam striking the disk is controlled such that the laser beam passes the back focal point of the lens locating at the opposite side to the disk with respect to the lens, resulting in the elimination of "beam shift". The track servo system further comprises a skew detecting means, by which a skew signal is obtained and the laser beam striking the disk is controlled to pass the virtual back focal point of the lens, eliminating the adverse effect of the skew of the disk on the beam shift.
500703
Arai Shigeru
Iwamoto Toshitaka
Fetherstonhaugh & Co.
Fujitsu Limited
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