Patent ID: 7847812

Claim:
A focusing control method for use in an optical disc drive to read/write an optical disc, the optical disc drive having an optical head and a control chipset, the optical disc having a data side and a label side, and the focusing control method comprising steps of: loading the optical disc in the optical disc drive with the label side thereof facing to the optical head; actuating the optical head along a focusing direction; generating a light intensity addition signal from the control chipset in response to optical signals reflected from the optical disc and received by the optical head; entering a ready-to-focus state when the light intensity addition signal is greater than a first threshold; entering a focus-locked state to enable a closed-loop control operation when the light intensity addition signal is greater than a second threshold, wherein the second threshold is greater than the first threshold and the second threshold is smaller than the maximum value of the light intensity addition signal; and entering a ready-to-read or ready-to-write state after the closed-loop control operation has been enabled and the light intensity addition signal has exceeded a third threshold for a predetermined period of time.