Retrofocus projection lens

Details Retrofocus projection lens Retrofocus projection lens

1995-04-14

1996-05-21

Epps, Georgia Y.

Optical: systems and elements

Lens

With field curvature shaping

359740, G02B 300, G02B 900

Patent

active

055195377

ABSTRACT:
A retrofocus projection lens comprises a first lens group having a negative refracting power, a second lens group having a positive refracting power, and a third lens group having a positive refracting power. The first to third lens groups are arranged in this order from a large conjugate side. The first lens group includes a convex negative meniscus lens on the large conjugate side, the second lens group includes a biconvex positive lens, and the third lens group includes, in order from the large conjugate side, a biconcave negative lens, a convex positive meniscus lens on a small conjugate side and a biconvex positive lens. The first to third lens groups satisfy the following relations (1) to (3):

REFERENCES:
patent: 5260832 (1993-11-01), Togino et al.
patent: 5319495 (1994-06-01), Yamada

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