公开(公告)号：JPH02187325A

公开(公告)日：1990-07-23

申请号：JP28160189

申请日：1989-10-27

Applicant: ESSILOR INT

Inventor： REIMON RIYUURAN

IPC: G02C7/02 ,  B29C35/02 ,  B29C43/02 ,  B29C43/06 ,  B29C43/36 ,  B29D11/00 ,  B29K69/00 ,  B29L11/00

Abstract: PURPOSE: To eliminate a large investment without generating an internal stress at the ambient temperature by limiting a molding force to a static stress by a shell member weight, selectively increasing by a weight of a pre-load mass placed on the shell member, and disposing an entirety in an oven. CONSTITUTION: A semi-processed blank 10 is supported at its periphery on a lower mold shell member 13I mounted in a ring 14, a central area of an upper mold shell member 13S is disposed on the blank 10, and an entirety is placed in an oven 18. Thus, a molding force applied to the blank 10 on the way of molding is limited to a static load generated only by a weight of the member 13S. As a substitute example, a weight of a pre-load mass 19 placed on the member 13S is added to the weight of the member 13S. The force received by the blank 10 is, in all cases, an intermediate value of 1.5 kg or less. The oven 18 is independently regulated in six regions, and regulated to a value exceeding a glass transition temperature of a synthetic resin molded from the blank 10 at least one point.