| 摘要 |
PROBLEM TO BE SOLVED: To obtain a plastic optical element which has excellent inclination precision of an optical axis of optical face of a molding in spite of its simple structure and has only a little change in thickness dependent on clamping force. SOLUTION: In a mold, a movable piece 1 which forms an optical face of an optical element molding is provided on a receiving plate 11 in a press-bonding manner. The tip of the movable piece 1 is fixed to an ejector rod 12. The base end of the ejector rod 12 is connected between above an ejector plate 13 and below an ejector plate 14 with a clearance 15. Thus, the ejector rod 12 does not tilt even when the ejector plate tilts and the movable piece 1 holds a state being pressed to the receiving plate. Even when the receiving plate 11, a spacer block 20, and a movable attaching plate 18 are contracted by clamping force, the interval between the movable piece 1 and a fixed piece 7 changes only a little. |
