Imaging lens and optical apparatus using the same

Details Imaging lens and optical apparatus using the same Imaging lens and optical apparatus using the same

1999-02-11

1999-10-19

Epps, Georgia

Optical: systems and elements

Lens

Multiple component lenses

359740, 359715, G02B 934, G02B 306

Patent

active

059698837

ABSTRACT:
In an imaging lens suitable for image reading of a four-lens element configuration comprising, successively from the object side, positive, positive, negative, and positive lenses, at least one surface of the fourth lens is made aspherical, whereby lighter weight and lower cost are achieved, while various kinds of aberration are corrected. The four-lens element imaging lens comprises, successively from the object side, positive first and second lenses L.sub.1 and L.sub.2 each having a surface on the object side convex toward the object side, a negative third lens L.sub.3 having a surface on the image side concave toward the image side, and a positive fourth lens L.sub.4 having at least one aspheric surface.

REFERENCES:
patent: 2767614 (1956-10-01), Altman
patent: 3200703 (1965-08-01), Muller et al.
patent: 3390936 (1968-07-01), Price
patent: 5731915 (1998-03-01), Noda
patent: 5739966 (1998-04-01), Tanaka

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