| 摘要 |
Disclosed is an access control system for an optical disk device, which has: a residual track number counter circuit which counts the number of residual tracks from a current position of an optical pickup to a target position; an optical pickup velocity calculation circuit which calculates a current velocity of the optical pickup at intervals of a predetermined time period; and a control circuit which comprises a reference velocity calculation means which a reference velocity from the number of residual tracks to be counted by the residual track number counter circuit, a velocity error calculation means which calculates a velocity error between the reference velocity and the current velocity, a current acceleration calculation means which calculates a current acceleration based on a variation of the current velocity and an acceleration error calculation means which calculates an acceleration error between the current acceleration and a predetermined reference acceleration; wherein the control circuit further comprises a control means which moves the optical pickup to the target position while controlling the velocity of the optical pickup by using the velocity error or using a value obtained by adding a correction value determined by the velocity error, the current acceleration and the acceleration error to the velocity error as a driving signal of the optical pickup.
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