G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 17/028 (2006.01) G11B 17/34 (2006.01) G11B 19/20 (2006.01) G11B 19/24 (2006.01) G11B 19/247 (2006.01) G11B 19/28 (2006.01) G11B 21/08 (2006.01) G11B 25/04 (2006.01)
Patent
CA 2088737
A disk recording system for disks such as videodisks or compact disks has a turntable (2) on which the disk (1) is supported adjacent a recording head (10). A shaft (3) defining the axis of rotation of the turntable rotates in a bearing (4) and that bearing (4) is itself movable about an axis defined by another shaft (8). The bearing (9) of the shaft (8) is an air bearing and there is a damper unit (18) for damping that movement. There may be a sensor (14) for detecting the rate of rotation of the shaft (3) defining the axis of rotation of the turntable (2). The radial displacement of the head (10) relative to the axis of the turntable (2) may be determined on the basis of rotation of the other shaft (8), and the rotation of the turntable controlled on the basis of the product of signals representing the radial displacement and the rate of rotation of the shaft (3) respectively.
Halliday Jonathan
Labinsky Alexander Numa
Reynolds Gerald Alfred John
Bereskin & Parr
Nimbus Communications International Limited
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