| 摘要 |
PROBLEM TO BE SOLVED: To prevent the deformation of a lens molded within a cavity space when a mold is opened to demold the lens in the mold for molding a long optical lens. SOLUTION: A cavity space is provided to a mold so as to be surrounded by a pair of cores 3, 4 and a pair of slide cores 6a, 6b and through-holes 18 having inclined surfaces 22 and vertical surfaces 21 are formed to the slide cores 6a, 6b. The guide surfaces coming into slide contact with the inclined surfaces 22 when the opening degree of the mold 1 is predetermined quantity or more to guide both slide cores 6a, 6b in an opening direction and the prescribing surfaces 27 coming into slide contact with the vertical surfaces 21 when the opening degree of the mold is below the predetermined quantity to prescribe the movement of both slide cores 6a, 6b in the opening direction are formed to angular cams 8a, 8b. Further, the recessed parts 31 opened to the cavity space and constituting a part of the cavity space are formed to the mutually opposed surfaces of both slide cores 6a, 6b. |
