Method and apparatus for controlling layer jumping of pickup head of optical disk drive

An optical disk drive having a pickup head with a layer jumping function;

• comprising:
• a pickup head, having an objective lens and a voice coil motor, and said pickup head driving said voice coil motor to move said objective lens vertically according to a drive control force;
• a preamplifier, for receiving an output signal of said pickup head to produce a combined reflective light signal and a focus error signal;
• a controller, for receiving said combined reflective light signal and said focus error signal to produce a layer jumping speed signal and a focus control signal respectively;
• a target speedometer, for outputting a target layer jumping speed signal;
• a first adder, for adding said layer jumping speed signal and said target layer jumping speed signal;
• a compensator, for receiving and compensating an output of said first adder;
• a gap balance calculator, for receiving a focus control signal to output a gap balance signal;
• a second adder, for adding a kickout/brake signal, said gap balance signal and the output of said compensator to output a control signal;
• and
• a driver for controlling said pickup head according to said control signal.

A method for controlling layer jumping of a pickup head of an optical disk drive, comprising:

• determining a layer jumping speed of the pickup head according to a combined reflective light signal outputted from a preamplifier;
• providing a target layer jumping speed;
• comparing said layer jumping speed of said pickup head and said target layer jumping speed to obtain the value of an error;
• and
• compensating a drive control force for layer jumping of said pickup head according to the value of said error.