Composite lens structure

A method of forming a composite lens structure, comprising:

• providing a substrate;
• providing a first mask having a plurality of first holes arranged in a array;
• providing a second mask having a plurality of second holes arranged in an array;
• providing an first energy beam;
• placing the first and second masks between the first energy beam and the substrate;
• moving the first mask or the substrate along a first direction;
• moving the second mask or the substrate along a second direction to form a two dimensional array of convex portions and concave portions on the substrate;
• providing a second energy beam;
• placing the first and second masks between the second energy beam and the substrate;
• moving the first mask or the substrate along a first direction;
• moving the second mask or the substrate along a second direction to form a convex high curvature portion and a convex low curvature portion adjacent to the convex high curvature portion on the convex portion, and to form a concave high curvature portion and a concave low curvature portion adjacent to the concave high curvature portion on the concave portion.

A method of forming a composite lens structure, comprising:

• providing a substrate;
• providing a mask having a plurality of holes arranged in an array;
• providing a first energy beam;
• providing a second energy beam;
• placing the mask between the first energy beam and the substrate;
• moving the mask or the substrate along a first direction;
• and
• moving the mask or the substrate along a second direction to form a two dimensional array of convex portions and concave portions on the substrate, wherein each convex portion is adjacent to a plurality of concave portions and each concave portion is adjacent to a plurality of convex portions;
• placing the mask between the second energy beam and the substrate;
• moving the mask or the substrate along a first direction;
• and
• moving the mask or the substrate along a second direction to form convex high curvature portion and a convex low curvature portion adjacent to the convex high curvature portion on the convex portion, and to form a concave high curvature portion and a concave low curvature portion adjacent to the concave high curvature portion on the concave portion.