| 摘要 |
Disclosed is an optical element wherein a fine shape is transferred precisely to the outer edge side of a lens while increase in cycle time is prevented. In the optical element, the outermost periphery of the fine shape is covered with a protrusion section provided at a flange part. Accordingly, in injection molding, with the resin introduced into the molding cavity formed in the mold, the molding cavity section corresponding to the resin inflow port side of the protrusion section provided at the flange part is filled first, and thereafter the molding cavity section corresponding to the fine shape adjacent to the protrusion section is filled. Preheating a mold surface section, for transferring the fine shape, of a movable mold with the resin accumulated in the molding cavity corresponding to the protrusion section suppresses the temperature reduction of the mold surface section corresponding to the fine shape.
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