Patent ID: 7755852
Filing Date: 2010-07-13
Classification: C03B,Y10S

Abstract:
1. An optical element molding method, comprising: heating and pressing a molding material plural times when molding an optical element having a radius of curvature R smaller than r, wherein r denotes a radius of a sphere having the same volume as the optical element to be molded, wherein the optical element has at least one convex surface, and a shape of the optical element is expressed by the following expression which is defined in a coordinate system in which an optical axis of the optical element is defined as a Z axis and a plane which is tangential to a vertex of the convex surface and which is perpendicular to the optical axis is defined as an X-Y plane, an X axis being orthogonal to the Z axis and a Y axis being orthogonal to the Z axis and the X axis: where Z ρ denotes the distance from the optical axis and is expressed by √{square root over (x C denotes a curvature of the convex surface and is expressed by 1/R R denotes a radius of curvature of the convex surface, K denotes a constant, B i denotes a natural number equal to or larger than three, a shape of a surface of the sphere is expressed by the following expression which is defined in a coordination system in which a central axis of the sphere is defined as a Z axis and a plane which is tangential to a vertex of the surface of the sphere and which is perpendicular to the central axis is defined as an X-Y plane, an X axis being orthogonal to the Z axis and a Y axis being orthogonal to the Z axis and the X axis: where Z ρdenotes the distance from the central axis and is expressed by √{square root over (x c denotes a curvature of the surface of the sphere and is expressed by 1/r, and r denotes the radius of the sphere, and ΔZ where ρ Z Z