Symmetrical lens system for use in copying machine

Details Symmetrical lens system for use in copying machine Symmetrical lens system for use in copying machine

1990-01-16

1991-09-24

Arnold, Bruce Y.

Optical: systems and elements

Lens

Including a nonspherical surface

359740, 359775, G02B 302, G02B 936

Patent

active

050509730

ABSTRACT:
A symmetrical lens system comprising, as arranged from the object side toward the image side, a first lens in the form of a positive meniscus lens having its convex surface directed toward the object side, a second lens in the form of a negative meniscus lens having its convex surface directed toward the object side, a diaphragm, a third lens in the form of a negative meniscus lens symmetrical with the second lens with respect to the diaphragm, and a fourth lens in the form of a positive meniscus lens symmetrical with the first lens with respect to the diaphragm. At least, the concave surface of the first lens and the fourth lens is aspherical.

REFERENCES:
patent: 3370904 (1968-02-01), Hudson
patent: 3449040 (1969-06-01), Ruben
patent: 3507560 (1970-04-01), Baker
patent: 3731990 (1973-05-01), Van Orden
patent: 4561730 (1985-12-01), Lawson et al.

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