Enlarging lens with a large working distance

Details Enlarging lens with a large working distance Enlarging lens with a large working distance

1994-12-30

1998-03-03

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359682, 359751, 359770, G02B 1514, G02B 1304

Patent

active

057241910

ABSTRACT:
An enlargement lens system with a large working distance comprising five lens components with a stop between the third and fourth components (numbered from the long conjugate side). It includes a first negative lens component, meniscus concave to the stop; a second positive lens component, having a convex surface toward the first lens component; a third and fourth lens component, both cemented negative doublets, meniscus concave to the stop; and a fifth positive power biconvex lens component, wherein BF/EF>1.0, where BF is the short conjugate back focus and EF is the focal length of the lens system.

REFERENCES:
patent: 1955590 (1934-04-01), Lee
patent: 2645155 (1953-07-01), Tronnier
patent: 2793565 (1957-05-01), Zollner et al.
patent: 2923203 (1960-02-01), Tronnier
patent: 2955513 (1960-10-01), Tronnier
patent: 2969713 (1961-01-01), Mukai
patent: 3468600 (1969-09-01), Hugues
patent: 3551030 (1970-12-01), Gilkeson et al.
patent: 4806003 (1989-02-01), Mukai et al.

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