Patent ID: 6813101
Filing Date: 2004-11-02
Classification: G02B

Abstract:
An imaging lens of fixed focal length formed of only two lens components, in order from the object side, as follows:an aperture diaphragm; a first lens component having positive refractive power, having a concave lens surface on the object side, and having at least one aspheric lens surface; and a second lens component having positive refractive power and having at least one aspheric lens surface; wherein the following conditions are satisfied:f1/f2<3.0 CL2/DL2>0.8 wheref1 is the focal length of said first lens component, f2 is the focal length of said second lens component, CL2 is the thickness of said second lens component, measured parallel to the optical axis, at a distance from the optical axis determined by the smaller maximum optically effective diameter in said imaging lens of the two lens surfaces of said second lens component, and DL2 is the thickness of said second lens component at the optical axis of the imaging lens.