| 摘要 |
PROBLEM TO BE SOLVED: To increase the number of repetitive recordings by making first and second delay means change delay times stepwise and making the width of the change step of the delay time due to the second delay means larger than that of the change step of the delay time due to the first delay means to properly restrict the degradation of a recording film. SOLUTION: When information are to be recorded in general areas, a selection circuit 305 is changed over to a clock generating circuit 302 in accordance with a signal from a discriminating means and the clock generating circuit 302 generates delay amounts 0 to 16T. When information are to be recorded in a TOC area, the selection circuit 305 is changed over to a clock generating circuit 303 in accordance with the signal from the discriminating means and the circuit 303 generates delay amounts 0 to 160T. The destination of the selector 304 is determined randomly, Then information are to be recorded in general areas, the ratio of a degradation area accounts for a VFO area is made small by making the change amount of record starting points smaller and by setting the length of the VFO area longer. In the TOC area, partial degradation areas in a data area are made so as not to be generated remarkably by making the change width of record starting points larger.
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