Patent ID: 9013810
Filing Date: 2015-04-21
Classification: G02B

Abstract:
1. A wide-angle image lens, 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; a second lens having positive refraction power and comprising a third surface facing the object side and a fourth surface facing the image side; a third lens having negative refraction power and comprising a fifth surface facing the object side and a sixth surface facing the image side; a fourth lens having positive refraction power and comprising a seventh surface facing the object side and an eighth surface facing the image side; and an image plane; wherein the image lens satisfies the following formulas: wherein D is the maximum image diameter of the image plane; TTL is a total length of the wide-angle image lens; CT4 is a distance along an optical axis of the wide-angle image lens from the seventh surface to the eighth surface; ET4 is a distance in a direction parallel to the optical axis of the wide-angle image lens from an outmost edge of the seventh surface to an outmost edge of the eighth surface; Z is a distance from a central point of the fifth surface to an outmost edge of the sixth surface along the optical axis; Y is a distance from the outmost edge of the sixth surface to the optical axis along a direction perpendicular to the optical axis; wherein the wide-angle image lens further satisfies the formulas: wherein R11 is a curvature radius of the first surface; R12 is a curvature radius of the second surface; F1 is a focal length of the first lens.