Patent ID: 7496020

Claim:
An optical disc apparatus comprising: an optical pickup for irradiating laser light to an optical disc to record synchronous information and data on a frame basis, receiving light returned from said optical disc and outputting a returned light signal; a driver for adjusting power of said laser light based on a level of the returned light signal from said optical pickup; and an encoder for providing said synchronous information and data to said optical pickup, the encoder toggling between a mark and a space as said synchronous information and providing either the mark or the space, wherein said encoder provides said synchronous information in such a manner that the synchronous information becomes a mark in one frame in a plurality of frames at regular intervals, said driver adjusts power of said laser light based on said mark in the one frame of a plurality of frames at a timing of recording said synchronous information of the mark, wherein said synchronous information is formed only by marks or only by spaces, and wherein said encoder comprises: a modulator for modulating data to be recorded; a sync generator for generating synchronous information; a first switch for selectively outputting the synchronous information of the mark from among said synchronous information from said synchronous generator at a timing such that the synchronous information of the mark appears in one frame in a plurality of consecutive frames; and a second switch, in which the synchronous information from said first switch and modulation data from said modulator are inputted, for toggling between the synchronous information and the modulation data and outputting either the synchronous information or the modulation data.