| 摘要 |
PURPOSE:To suppress a strain of an optically curably molded form by scanning a thin layer of optically curable resin with an optical beam moving along a scanning line, inverting a scanning direction, and repeatedly scanning it. CONSTITUTION:A sectional layer 21 of optically curable resin is scanned by an optical beam moving along a scanning direction SLDD, and a sectional layer 22 is scanned by an optical beam moving along a scanning direction SLDU. Similarly, scanning directions of third, fifth,... sectional layers are SLDD, and fourth, sixth,... sectional layers are SLDU. Thus, the scanning directions are inverted at the sectional layers. In this manner, a stress tending to bend to the side of a surface S2 is operated at the first, third, fifth,... sectional layers, and a stress tending to bend to the side S1 is operated at the second, fourth, sixth,... sectional layers. As a result, an internal stress is cancelled as a whole to mold a molded form 20 having a small strain. |
