| 摘要 |
A convex lens (50) is molded, the convex lens having an effective portion through which light can transmit and an outer peripheral portion outside the effective portion. A gate closing pin (61a) is made to recede and resin is placed in a cavity (52) of a mold device (23). The gate closing pin (61a) is allowed to bite into the outer peripheral surface of the convex lens (50) formed in the cavity (52), and the pin is stopped before the effective portion. The resin in the cavity (52) is cooled and solidified, the pin (61a) is made to recede and moved to the outside of the outer peripheral surface of the convex lens (50), the mold device (23) is opened, and the convex lens (50) is taken out.
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