Patent ID: 7499220
Filing Date: 2009-03-03
Classification: B29C,B29D,G02B

Abstract:
1. A method of manufacturing an optical lens which is formed by upper and lower molds and includes a lens portion having a convex lens surface or a concave lens surface on each side, comprising: forming a lens surface molding portion of a convex surface or a concave surface corresponding to the lens surface in each of the upper and lower molds and simultaneously, forming a small hole having the depth which is less than four times the used wavelength of the lens portion, the small hole being centered on the position corresponding to the axis of the lens surface; injection-molding the lens portion by use of the upper and lower molds on which the lens surface molding portion is formed; obtaining a deviation between the optical axes of the respective lens surfaces of the lens portion based on a measurement of a positional deviation between respective convex portions formed on both lens surfaces by the small holes; and adjusting the relative position between the upper and lower molds based on the positional deviation between the respective convex portions.