Patent ID: 9193115
Filing Date: 2015-11-24
Classification: B23B,B29C,B29D,B29L,B32B,Y10T

Abstract:
1. A method for manufacturing an optical element having an optical surface including a plurality of ring-shaped zones formed concentrically around an optical axis, comprising: preparing a mold for forming an optical element, wherein the mold comprises a mold base on which a plurality of first grooves are formed concentrically by relatively driving a diamond cutting tool and the mold base for cutting the mold base, the diamond cutting tool comprising a cutting edge with a cutting face and a flank, the mold base being driven to be rotated, each of the first grooves comprising a bottom surface having a predetermined width extending in a radius direction of the first grooves, providing the mold with a material of the optical element, and molding the material into the optical element, wherein the preparing step comprises: wherein each of the ring-shaped zones of the optical element comprises a second groove comprising a top surface having the predetermined width extending in a radius direction of the ring-shaped zones, a side surface, and a curved surface with a curvature radius in a range from 0.5 μm to 2 μm connecting the top surface and the side surface.