Patent ID: 6868548

Claim:
A method for controlling an open state and a locked state of a cover installed on an optical storage carrier player, the carrier player having a driving unit for supporting and rotating an optical storage carrier, a locking means for selectively engaged with or separated from the cover, and a controller coupled to the driving unit and the locking means, the method comprising following steps of: (a) presenting an actuating signal to actuate the controller to detect a rotation speed of the driving unit and compare the rotation speed with a predetermined speed wherein the rotation speed of the driving unit is detected by transforming a sine wave signal generated by the driving unit into a series of pulse signal with intervals, (b) generating a first control signal by the controller transmitting to the locking means to make the locking means engaged with the cover when the detected rotation speed is higher than the predetermined speed; and (c) generating a second control signal by the controller transmitting to the locking means to make the locking means separated from the cover when the detected rotation speed is lower than the predetermined speed to make the cover to enter the open state.