Patent ID: 7670515

Claim:
A fabrication method of a mold for a microlens having a desired radius (R) of curvature, the method comprising the steps of: (a) preparing a substrate at least a portion of which is electrically conductive; (b) forming an insulating mask layer on the substrate such that the insulating mask layer has an opening to expose the conductive portion of the substrate, a diameter or width (φ) of the opening being 10 μm≦φ≦0.35 R and R≦200 μm; (c) performing electroplating using the conductive portion of the substrate as a cathode to deposit a first electroplated portion in the opening and on the mask layer; (d) terminating electroplating when the first electroplated portion reaches the desired radius (R) of the curvature after forming a minimum radius (R min ) of curvature; (e) forming a sacrificial layer on the first electroplated portion; (f) forming an electrode layer on the sacrificial layer; and (g) forming a plated portion used as the mold on the electrode layer by electroplating by using the electrode layer as a cathode, wherein the desired radius (R) of curvature and the minimum radius (R min ) are radii at an optical axis of the first electroplated portion.