Start-control method and circuit for optical disc play-back...

Details Start-control method and circuit for optical disc play-back... Start-control method and circuit for optical disc play-back...

G - Physics

11

B

352/32.21

G11B 19/20 (2006.01) G11B 7/09 (2006.01) G11B 25/04 (2006.01)

Patent

CA 1237813

ABSTRACT Start-control method and circuit for an optical disc play-back system according to this invention can allow the starting current of the system to be reduced considerably. The method includes the steps of loading the disc onto a disc drive motor, then finding the focal position of the lens, then powerfully energizing the disc drive motor for a certain period of time so as to start the disc spinning and then energizing the focus- and the tracking-servo circuits during inertial rotation of the disc drive motor. The circuit includes a disc-drive-motor servo switch capable of switching the power supply for the disc drive motor from the kick circuit to the disc-drive-motor servo circuit, a focus servo switch capable of switching the power supply for the focus servomotor from the focus search circuit to the focus servo circuit, and a tracking servo switch capable of initiating power supply to the tracking servomotor.

480054

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