Patent attributes
An imaging lens includes a first lens having at least one aspheric surface; a second lens having at least one aspheric surface; a third lens having at least one aspheric surface; 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. The first lens is formed in a shape so that a surface thereof on the object side is convex near an optical axis thereof. The seventh lens is formed in a shape so that a surface thereof on the image plane side is concave near the optical axis thereof. The first lens and the sixth lens have specific Abbe's numbers.
