| 摘要 |
<p>The material of core supporting members (12, 22) is selected such that the thermal expansion coefficient thereof is higher than that of mold sleeves (10, 20). Even when the diameter of openings (10a, 20a) of the mold sleeves (10, 20) is increased due to thermal expansion during transfer molding, the outside diameter of the core supporting members (12, 22) is further increased; gaps between the core supporting members (12, 22) and the openings (10a, 20a) are eliminated. As a result, the optical axes of transfer-molded surfaces formed on cores (13, 23) are accurately positioned with respect to the axes of the openings (10a, 20a), resulting in high-precision optical elements and the like.</p> |
