Patent ID: 9541738
Date: 2017-01-10
CPC Classifications: G02B

Claim:
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 at least one aspheric surface; a fifth lens having at least one aspheric surface; a sixth lens having two aspheric surfaces; and a seventh lens having two aspheric surfaces, arranged in this order from an object side to an image plane side, wherein said first lens is formed in a shape so that both surfaces are convex near an optical axis thereof, said fourth lens is formed in a meniscus shape so that a surface thereof on the object side is concave near the optical axis, and said seventh lens is formed in a shape so that a surface thereof on the image plane side is concave near the optical axis.