| 摘要 |
<P>PROBLEM TO BE SOLVED: To make a reproduction characteristic of a wobbled groove and a characteristic of a fluctuation amount of a push-pull signal satisfactory by suppressing a height change in a land part at the time of manufacturing an optical disk stamper. <P>SOLUTION: An EOM (electro optic modulator) 15, a photodetector (PD) 16 and a light output control part (APC (auto power controller)) 17 make exposure per unit area of a laser beam emitted from a laser source 14 for oscillating a recording laser beam of quartic harmonic (λ=266 nm) of a YAG laser to be constant. An acousto-optic modulation deflector 22 optically deflects the laser beam and then is made incident on a beam expander (BEX) 26. Since the acousto-optic modulation deflector 22 forms respective wobbled grooves for a BCA (burs cutting area) area, a PIC (permanent information & control data) area and a data recording area, a record beam is deflected. Relative variation in height of a land part is not higher than 0.083 in the PIC area and is not higher than 0.047 in the data recording area. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
