Patent ID: 7773305
Filing Date: 2010-08-10
Classification: G02B

Abstract:
1. A wide-angle lens comprising: a front lens group and a rear lens group that are arranged in order from an object side toward an image side; and an aperture being arranged between the front lens group and the rear lens group, wherein the front lens group includes at least two lenses arranged toward the object side that have negative powers, and at least one lens arranged toward the image side that has a positive power, the rear lens group includes at least one lens having a positive power, one of the lenses of the front lens group arranged second in order from the object side has a lens face arranged into an aspheric surface, the front lens group and the rear lens group are arranged into an image forming system having an angle of view greater than 180 degrees, and the lens face arranged into an aspheric surface is the only lens face in the front lens group that is arranged into an aspheric surface.