Patent ID: 8313632
Filing Date: 2012-11-20
Classification: B29D,G02B

Abstract:
1. A process of fabricating an optical lens, said process comprising the steps of: preparing a semiconductor substrate having a flat top surface and a flat bottom surface opposed to each other; forming a patterned anode on said bottom surface, placing said semiconductor substrate in an electrolyte solution; flowing a current between said anode and a cathode within said solution to convert the top surface of said substrate to a varying depth from portions to portions, leaving a porous layer in said top surface; and removing said porous layer from said substrate to leave a curved optical lens surface on said top surface, characterized in that said anode is deposited on said bottom surface to give a consolidated structure and is configured to give a predetermined distribution of an electric field intensity which varies from portion to portions of said substrate across said top and bottom surfaces of said substrate, the anode patterned to thereby provide said porous layer having the varying depth in match with the distribution of said electric field intensity, wherein said anode is formed by the steps of: depositing an electrically conductive layer on the bottom surface of said substrate; and removing a portion of said conductive layer to form a circular opening in said conductive layer, said circular opening being responsible for giving a convex profile to the top surface at a portion opposed to said circular opening.