Optical disk drive and method for driving the optical disk...

Details Optical disk drive and method for driving the optical disk... Optical disk drive and method for driving the optical disk...

G - Physics

11

B

G11B 19/26 (2006.01) G11B 7/0037 (2006.01) G11B 7/004 (2006.01)

Patent

CA 2554383

An optical disk drive includes: an objective lens for converging a light beam onto an optical disk with an information storage layer; an actuator for moving the lens perpendicularly to the storage layer; an actuator driver for moving the lens at: a predetermined velocity by controlling the actuator's operation; and a disk position detector for detecting the position of the lens, when the focal point of the beam is located on the storage layer, as a disk position. While the lens is being moved toward the disk to perform a focus finding operation, the moving velocity of the lens is set high until the lens reaches a velocity switching point, determined by reference to the disk position, and is set low once the lens has passed the point. The switching point is set farther away from the disk than the position of the lens is when the focal point of the beam is located on the storage layer of the disk.

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