Patent ID: 8922914
Filing Date: 2014-12-30
Classification: G02B

Abstract:
1. An image capturing lens system, in order from an object side to an image side comprising four lens elements with refractive power: a first lens element with positive refractive power having a convex object-side surface at a paraxial region; a second lens element with negative refractive power having a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region, wherein the image-side surface of the second lens element changes from concave at the paraxial region to convex at a peripheral region, and both the object-side surface and the image-side surface of the second lens element are aspheric; a third lens element with positive refractive power having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; and a fourth lens element with negative refractive power having a concave image-side surface at a paraxial region, wherein the image-side surface of the fourth lens element changes from concave at the paraxial region to convex at a peripheral region, and both an object-side surface and the image-side surface of the fourth lens element are aspheric; wherein a displacement in parallel with an optical axis from an axial vertex on the image-side surface of the second lens element to a maximum effective diameter position on the image-side surface of the second lens element is Sag22, a central thickness of the second lens element is CT2, an axial distance between the first lens element and the second lens element is T12, a focal length of the first lens element is f1, a focal length of the third lens element is f3, and the following relationships are satisfied: