Patent ID: 6295261
Filing Date: 2001-09-25
Classification: G11B

Abstract:
A method of controlling a revolution speed of a spindle motor on which an optical disk is mounted having recording linear velocities in an optical disk drive, comprising the steps of:(a) calculating target RPMs (Revolutions Per Minute) and actual PWM (Pulse Width Modulation) signal values for maintaining the target RPMs according to the recording linear velocities of the optical disk, and storing the target RPMs and the actual PWM signal values in a table;(b) controlling the revolution of the spindle motor with a PWM signal value greater than one of the actual PWM signal values for maintaining one of the target RPMs until an RPM of the spindle motor reaches the one target RPM; and(c) controlling the revolution of the spindle motor with the one actual PWM signal value for maintaining the one target RPM, in response to the RPM of the spindle motor reaching the one target RPM.