| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a surface sink inevitable in thick resin molding by a comparatively thin secondary molding process, to realize resinification of a projector type headlight lens considered as impossible in the past, and to save weight and lower costs extensively. SOLUTION: In this manufacturing method for a headlight lens 1, the headlight lens 1 is manufactured by injection molding using a transparent resin as a material, and the injection molding is composed of a primary molding process molding the greater part of a concave part 2 with the same material and a secondary molding process molding a remaining part of the concave part 2 and a flat part 3. The maximum thickness in the primary molding process is set thicker than that in the second molding process, and the secondary molding process is carried out after cooling a half-finished product H in the primary molding process. Thereby, a surface sink 4 inevitable when molding the thick resin is compensated by the secondary molding process carried out comparatively thinly, and the surface sink caused by the secondary molding process is set within the allowable range.
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