| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection molding die which can separate a lens produced by injection-molding a liquid-like resin material without using an ejector pin and without leaving a push mark on the optical surface of the lens, a method for producing the lens, and the lens. SOLUTION: The injection molding die 30 has depressions 10a and 10b for molding projections and formed in a cavity 3, and the depressions 10a and 10b have slope surfaces 21a and 22a tilting in a direction different from a die opening direction. In a plastic lens 19 injection-molded in the cavity 3, besides optically effective surfaces, projections 14 injection-molded by the depressions 10a and 10b are formed. When the die is opened, since the projections 14 are separated in a direction different from the die opening direction along the slope surfaces 21a and 22a, the plastic lens 19 is rotated to tilt the optically effective surfaces 11 and 12 to be separated from the injection molding die 30. COPYRIGHT: (C)2008,JPO&INPIT |
