| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve such a problem that when a high frequency component is superposed on a semiconductor laser drive current and noise of the semiconductor laser is reduced in a space forming period or a space and mark forming period during recording data, the high frequency component is overlapped on mark forming start timing and mark forming finish timing due to control circuit delay or the like of high frequency superposition, and when superposition is performed until directly before mark forming, a start end and finish end of a mark formed on a disk are varied by non-synchronism of the high frequency component and a recording clock. <P>SOLUTION: This apparatus is provided with a high frequency superposition control means by which superposition of the high frequency component is stopped preceding by the prescribed time to the start timing and the finish timing of the semiconductor laser drive current for forming mark, and superposition of the high frequency component is started after the prescribed time. Thereby, variation on a disk of the mark start end and the finish end due to superposition of the high frequency component can be prevented. Consequently, jitter deterioration in high speed recording can be prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
