Wide angle copying lens with high aperture efficiency

Details Wide angle copying lens with high aperture efficiency Wide angle copying lens with high aperture efficiency

1982-10-22

1984-12-25

Corbin, John K.

350474, G02B 962

Patent

active

044900198

ABSTRACT:
A stop is disposed forwardly of the lens system which comprises three individual lenses. A first lens located nearest the stop represents a positive meniscus lens, followed by a second and a third individual lens, both of which represent negative meniscus lenses. Each of the first to the third lens has its concave surface directed toward the stop. A small air gap exists between the second and the first lens. Representing the focal length of the first lens by f.sub.1, the composite focal length of the first and the second lens by f.sub.1,2, the composite focal length of the first to the third lens by f, the radius of curvature of a second refractive surface in the lens system by r.sub.3, the radius of curvature of a third refractive surface by r.sub.4, the refractive index of the first lens by n.sub.1, and the Abbe number of the first and the second lens by .nu..sub.1, .nu..sub.2, respectively, these parameters satisfy the following inequalities.

REFERENCES:
patent: 3922071 (1975-11-01), Kitagawa et al.

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