G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2
G11B 7/00 (2006.01) H04N 5/76 (2006.01)
Patent
CA 1150833
ABSTRACT A spindle servo system for in an apparatus for recovering a signal from a track on the surface of a disc, wherein the signal includes a signal defining a time base, and the system includes optical system for directing a source beam of radiation to the track and for directing a modulated beam of radiation containing the signal to a signal recovery device for recovering the signal from the modulated beam, the spindle servo system comprising: a spindle motor for rotating the disc whereby relative motion between the disc and the source beam produces the modulated beam; a spindle tachometer including first and second tachometer elements coupled to the spindle motor, for producing first and second spindle tachometer signals, indica- tive of the actual angular rate of rotation of the spindle motor; a spindle reference signal generator for producing a spindle reference signal representing a desired angular rate of rotation of the spindle motor; a device for comparing each of the first and second spindle tachometer signals with the spindle reference signal, to produce first and second error signals representative of the detected differences therebetween; and an adder for summing together the first and second error signals to produce a spindle motor control signal for coupling to the spindle motor to produce the desired angular rate of rotation.
416307
Ceshkovsky Ludwig
Dakin Wayne R.
Discovision Associates
Gowling Lafleur Henderson Llp
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