| 摘要 |
PROBLEM TO BE SOLVED: To provide a two-color molding which can suppress deformation of a primary molded part by suppressing transmission of heat and stress during secondary molding to the primary molded part.SOLUTION: A two-color molding 1 is produced by obtaining a lens part (primary molded part) 2 through primary molding of a resin by using a mold, obtaining a support part (secondary molded part) 3 by secondary molding of a resin in a state where the lens part 2 is left in the mold and, at the same time, integrating the support part 3 and the lens part together. A notch groove 5 is formed in the boundary between the lens part 2 and the support part 3 so that the contact area of the boundary surface between the lens part 2 and the support part 3 is decreased by the area of the notch groove 5. A rib 3A protruded integrally in the inner periphery of the support part 3 toward the radial-direction inner side is superimposed with a rib 2A protruded integrally in the outer periphery of the lense part 2 toward the radial-direction outer side and integrated. |
