Patent ID: 8988793
Filing Date: 2015-03-24
Classification: G02B

Abstract:
1. An imaging lens comprising: a first lens having positive refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having negative refractive power; and a fifth lens having negative refractive power, arranged in this order from an object side to an image plane side, wherein said first lens has a shape so that a curvature radius of a surface thereof on an object side is positive, said second-lens has a shape so that a curvature radius of a surface thereof on the object side and a curvature radius of surface thereof on an image plane side are positive, said third lens has a shape so that a curvature radius of a surface thereof on the object side is positive, said fifth lens has a shape so that a curvature radius of a surface thereof on the object side and a curvature radius of surface thereof on the image plane side are positive, and said first lens has a focal length f