Patent ID: 6600708
Filing Date: 2003-07-29
Classification: G11B

Abstract:
A method for controlling speed of a spindle motor of an optical disc player, the spindle motor driving an optical disc disposed within the optical disc player, comprising the steps of:(1) decide an allowable speed based on a predetermined algorithm; (2) set speed of the spindle motor to operate at a current speed Wc which is equal to said allowable speed; (3) accept a control signal; (4) test if duration of the control signal meet a predetermined criterion, wherein the predetermined criterion includes a first threshold value and a second threshold value; (5) if YES in step (4), calculate a speed value of Wd, Wd being equal to Wc plus a Wa, Wa being a predetermined variation value, and, afterwards, set speed of the spindle motor to operate at the speed of value Wd, wherein the variation value Wa takes a first value when the duration of the control signal is larger than the first threshold value and smaller than the second threshold value, and the variation value Wa takes a second value which is negative of the first value when the duration of the control signal is larger than the second threshold value; (6) if NO in step (4), maintain speed of the spindle motor.