PLASTIC LENS, METHOD FOR MANUFACTURING PLASTIC LENS, AND IMAGE-CAPTURING DEVICE USING PLASTIC LENS

摘要

In relation to a plastic lens manufactured by injection molding, there is provided a plastic lens that has a tubular flange having a given thickness or more even after cutting of a gate and that is anchored to a lens holder while exhibiting a superior thermal caulking characteristic. A plastic lens 1 has a lens 2 that effectively functions as a lens at a center and an annular flange 3 that does not act as a lens along a circumference of the lens. A gate 4 serving as a flow channel through which molten plastic is to be poured during molding is formed on a circumference of the flange. The gate is cut and taken away at an angle of inclination so as to include a point of intersection between the gate 4 and the circumferential flange 3, whereby a circumferential flange having a given thickness or more is formed.