| 摘要 |
<p>PURPOSE:To improve a stability in molding and prevent a deterioration of transfer properties and an increase of birefringence by a method wherein a fluctuation of a roll gap is kept within a fixed range without a shift from an optimum position when the rotating speeds of opposed rolls are set equal by bringing a drive motor of the respective rolls under digital control. CONSTITUTION:A rotating speed of a motor 14 for driving rolls is converted and detected by a rotary encoder 15. In an arithmetic operation part 10, the detected value is arithmetically compared with a digital set value transmitted from an input part 11. In accordance with the found difference, the rotating speed of the motor 14 is controlled through a rotation control part 12 by a signal outputted from a drive current supply part 13. In this manner, an optical information recording medium substrate having a long-term stability can be molded.</p> |
