Patent ID: 6226242
Filing Date: 2001-05-01
Classification: G11B

Abstract:
A pickup control method for a disk recording or playback device comprising a pickup having a lens for projecting a beam onto a signal recording surface of a disk and movable along a phantom line R1 joining the center of the disk and the lens, a motor for moving the pickup, arithmetic means for calculating the position of the pickup on the disk from data read by the pickup, and timer means for measuring the time taken for the movement of the pickup, the method being characterized by:predetermining a specified distance L1 the pickup is to be moved and a standard period of time T1 required for the movement over the distance L1,energizing the motor with a voltage or current of given value a first to move the pickup the specified distance L1, measuring the time taken for the movement by the timer means and calculating the ratio of the measured movement time to the standard time T1,calculating a voltage or current b to be supplied to the motor from the ratio and the value a to approximate the pickup movement time to the standard time T1 and temporarily storing the voltage or current value b for the motor when the movement time is approximate to the standard time T1, andsupplying the voltage or current of stored value b to the motor when the pickup is to be moved subsequently.