Patent ID: 6977779
Filing Date: 2005-12-20
Classification: G02B

Abstract:
1. An imaging lens formed of only three lens components, arranged along an optical axis in order from the object side, as follows: a stop; a first lens component; a second lens component; and a third lens component; wherein all three object-side lens surfaces and all three image-side lens surfaces of the three lens components are aspheric; the first lens component has positive refractive power, its lens surface on the object side is convex in a central area near the optical axis with the optical axis as an axis of rotational symmetry, and its lens surface on the image side is convex with the optical axis as an axis of rotational symmetry; the second lens component has negative refractive power, its lens surface on the object side is concave in a central area near the optical axis with the optical axis as an axis of rotational symmetry, and its lens surface on the image side is convex in a central area near the optical axis with the optical axis as an axis of rotational symmetry; and the third lens component has positive refractive power, its lens surface on the object side is convex in a central area near the optical axis with the optical axis as an axis of rotational symmetry, its lens surface on the image side is concave in a central area near the optical axis with the optical axis as an axis of rotational symmetry, and its lens surface on the image side becomes convex at the periphery with the optical axis as an axis of rotational symmetry.