Patent ID: 8482865
Filing Date: 2013-07-09
Classification: G02B

Abstract:
1. An image lens for imaging an object on an image plane, in the order from the object side to the image side thereof, comprising: a first lens having positive refraction power and comprising a first surface facing the object side and a second surface facing the image side; and a second lens having negative refraction power and comprising a third surface facing the object side and a fourth surface facing the image side; wherein the image lens satisfies the following formulas: wherein FB is a distance between the fourth surface and the image plane along an optical axis of the image lens, TTL is a total length from an aperture stop to the image plane, Z is a distance from a central point of the fourth surface to the fourth surface along the optical axis of the image lens, Y is a distance from the central point of the fourth surface to an edge of the fourth surface along a direction perpendicular to the optical axis of the image lens, T is a thickness of the second lens along the optical axis, G