Patent ID: 7061696
Filing Date: 2006-06-13
Classification: G02B

Abstract:
1. A single focus lens comprising, arranged along an optical axis in order from the object side: a stop on the object side of the single focus lens; a first lens component of positive refractive power, having a meniscus shape, having both surfaces of aspheric shape, and having a convex object-side surface; a second lens component of positive refractive power near the optical axis, having a meniscus shape near the optical axis, having both surfaces of aspheric shape, having a convex object-side surface near the optical axis, and having a part of negative refractive power within the effective diameter of the object-side surface of the second lens component; wherein the following conditions are satisfied: where R f is the focal length of the entire single focus lens on the optical axis, D f pa is the optical distortion at the maximum image height, and pb is the optical distortion at fifty percent of the maximum image height.