Patent ID: 8848299
Filing Date: 2014-09-30
Classification: G02B

Abstract:
1. An optical module having an object side and an image side; the module comprising, from the object side to the image side: a positive meniscus lens having a focal length F a plano-convex lens having a focal length F the four optical surfaces having their curvatures defined by the equation: where: i is the surface number (i=1 to 4); for the i-th surface, Zi is the distance between a point on the aspheric surface at the height of Yi above the optical axis and a plane tangent to the aspheric surface at the intersection of this surface with the optical axis; Ki is a constant called the conic constant of the i-th surface; CURVi is the curvature if the i-th surface at the intersection of this surface with the optical axis; where CURV3=0; Ai, Bi, Ci, Di, are, respectively, the aspheric coefficients of the 2 Ri is the effective radius of aperture of the i-th surface; the two lenses being such that where