Patent ID: 8120999

Claim:
An optical disc apparatus for recording information onto an optical disc, comprising: a laser light source for emitting a laser beam; an objective lens for converging said laser beam and irradiating onto said optical disc; optical detecting module which has said laser light source and said objective lens and optically reads the information recorded on said optical disc; signal generation module for generating a focusing error signal by using an output of said optical detecting module; recording control module for controlling the recording of the information onto said optical disc; light emission control module for controlling the light emission of said laser light source in accordance with an output of said recording control module; focus control module for allowing a light spot of said laser beam to execute a tracking operation to a recording surface of said optical disc by using said focusing error signal; address detecting module for detecting an address of said optical disc by using an output of said optical detecting module; address storing module for storing a predetermined address which is located before a recording start address by a predetermined offset; comparing module for comparing the address which is outputted by said address detecting module with said predetermined address; bias calculating module for calculating a bias level in accordance with a recording power; and defocus control module for generating a predetermined defocus amount in said tracking operation, wherein when said comparing module detects that the address which is outputted by said address detecting module coincides with said predetermined address, said defocus control module is set to generate a predetermined defocus amount in accordance with the bias level calculated by said bias calculating module.