LENS MANUFACTURING METHOD

摘要

The purpose of the present invention is to provide a lens manufacturing method that can accurately position a light-shielding member inside a mold unit without providing a positioning section on the light-shielding member or providing a dedicated positioning member independent of the light-shielding member. A positioning section for positioning a diaphragm plate (light-shielding member) is provided on a preform formed from a lens material. The positioning section engages with the diaphragm aperture of the diaphragm plate and positions the diaphragm plate. The diaphragm plate is pre-assembled to the preform. In this state, the preform is charged in the mold unit. The preform is heated and is compression molded by the mold unit.