PLASTIC LENS INJECTION GASKET

摘要

PURPOSE:To reduce the kinds of gaskets by using an injection gasket in the preparation of various spherical lenses different in curvature or various astigmatic lenses different in astigmatic degree in common. CONSTITUTION:The ring-shape holding strip 4 holding the peripheral edge part of one mold 2A over the entire periphery thereof is provided to the inner peripheral surface of a cylindrical gasket 1 in a protruding state and three holding parts 5 positioned so as to be respectively separated from the holding strip 4 by an equal distance and holding the peripheral edge part of the other mold 2B at three places are provided to the gasket at an appropriate interval in the circumferential direction thereof.