Patent ID: 6055217
Filing Date: 2000-04-25
Classification: G11B

Abstract:
A seek control method in an optical storage device, of seek-moving a light beam of an optical head from an initial track on an optical storage medium to a destination track, said method comprising:a step of generating a target velocity along a target velocity curve to reach the destination track from the initial track;a step of detecting a real velocity of said optical head from a track error signal of said optical head;a step of calculating an error value between the target velocity and the real velocity;a step of generating at least one of a nonzero feedforward value for acceleration and a nonzero feedforward value for deceleration;a step of calculating a control value by adding the nonzero feedforward value to the error value; anda step of driving a moving mechanism for moving said optical head in accordance with the control value;wherein said step of generating a nonzero feedforward value comprises:a step of detecting when the optical head reaches a first point before a start point of acceleration or a second point before a start of deceleration in said target velocity curve; andwherein said nonzero feedforward value for acceleration is generated upon detecting that said head has reached said first point or the nonzero feedforward value for deceleration is generated upon detecting that said head has reached said second point.