Patent Number: 6,310,734

Title: Imaging lens and image readout apparatus using the same

Abstract: An imaging lens comprises, successively from an object side, a positive first lens L.sub.1 having a convex surface directed onto the object side, a negative second lens L.sub.2 having a concave surface directed onto an image side, a third lens L.sub.3 of a positive meniscus form having a convex surface directed onto the object side, a fourth lens L.sub.4 of a positive meniscus form having a convex surface directed onto the image side, a negative fifth lens L.sub.5 having a concave surface directed onto the object side, and a positive sixth lens L.sub.6 having a convex surface directed onto the image side, the first lens L.sub.1 and the second lens L.sub.2 being cemented to each other, the fifth lens L.sub.5 and the sixth lens L.sub.6 being cemented to each other, the imaging lens satisfying the following conditional expressions: where f is the focal length of the whole system; f.sub.3 is the focal length of the third lens; f.sub.12 is the composite focal length of the first and second lenses; f.sub.34 is the composite focal length of the third and fourth lenses; d.sub.6 is the distance between the sixth and seventh surfaces; and v.sub.1 and v.sub.2 are the respective Abbe numbers of materials of the first and second lens.

Inventors: Otomo; Ryoko (Omiya, JP), Noda; Takayuki (Omiya, JP), Yamakawa; Hiromitsu (Omiya, JP)

Assignee: Fuji Photo Optical Co., Ltd.

International Classification: G02B 9/62 (20060101); G02B 9/00 (20060101); G02B 009/62 ()

Expiration Date: 10/30/2018