| 摘要 |
PURPOSE:To prolong the life of a laser while maintaining the stability of the accuracy of focus control. CONSTITUTION:The master disk exposing device for optical disks which exposes the master disk for optical disks by irradiating the master disk with a laser beam of a specified light quantity has a semiconductor laser for irradiating the master disk with the laser beam and a control means for controlling the semiconductor laser to light the laser only at the time of an exposing mode in the stage of executing the above-mentioned exposing. |
