| 摘要 |
PURPOSE:To reduce a thermal load to a recording film and to prevent the recording film from being broken by bringing an optical output to AC modulation and allowing it to rise, at the time of setting to recording power or erasion power from reproducing power. CONSTITUTION:At the recording time when a recording gate WG is 'H', an analow switch SW4 is selected,and at the reproducing time when the gate WG is 'L', a switch SW5 is selected. Therefore, only at the time of recording, a peak holding circuit 22 detects a peak of a monitor voltage VM and inputs it to a servo-amplifier 4. On the other hand, an AND gate 24 of a recording data control means 23 takes AND of an inversion output of a holding gate HLD and the gate WG and generates a recording set section signal SET. Subsequently, by an AND gate 25, AND to AC modulation data ACDT is taken, and by adding the AC modulation data to regular recording data WDT, recording data WDTT is generated. In such a way, a thermal load to a recording film at the time of setting an optical output is reduced and it is prevented that the recording film is broken and its service life becomes short. |
