Patent ID: 7483225
Filing Date: 2009-01-27
Classification: G02B

Abstract:
1. A taking optical system for forming an optical image of an object on a light-receiving surface of an image sensor, comprising: at least one optical prism having an entrance surface, at least three reflective surfaces each curved, and an exit surface, said optical prism receiving rays from an object side through said entrance surface, then reflecting the rays on said at least three reflective surfaces, and then letting out the rays through said exit surface, wherein said optical prism is formed of a medium having a refractive index of 1.2 or more, an optical aperture is disposed on or near one of said at least three reflective surfaces, at least one of said at least three reflective surfaces is an eccentrically disposed rotation-asymmetric surface, and let a ray traveling from a center of the object through a center of said optical aperture to a center of an image surface be called a base ray, then intersections of said base ray with said entrance surface, each of said reflective surfaces, and said exit surface all lie approximately on a same plane.