| 摘要 |
PURPOSE:To form a pit corresponding to the time width of a reference digital signal even when the environment at the time of information recording is changed by generating a recording signal correcting a reference digital signal based on the clock signal. CONSTITUTION:A reference digital signal A is turned to be a signal B by a NOT circuit 8, entered to a shift register 1 and outputted delayed by one clock CP. On the other hand, a counter 2 is counted by a clock signal CK, thereby a reference time width is divided into eight variable sections. In a signal H, one variable section becomes low level for every four section in the latter half of the high level. Further, in the high level following the low level of a signal H, the leading edge part becomes low level. The recorded signal H is inputted to a laser 14 through a driver 13. |
