Apochromat optical system

Details Apochromat optical system Apochromat optical system

1989-05-01

1990-09-11

Arnold, Bruce Y.

350438, 350464, G02B 962

Patent

active

049557017

ABSTRACT:
An apochromat optical system for a photoengraving process comprises a first lens group which includes a first lens having a positive power, a second lens made of Kultz flint glass having a negative power and a third lens in the form of a meniscus having a positive power. The first to third lenses are successively disposed in order starting from the object side. A second lens group includes the substantially same configuration of lenses as in the first lens group. The lenses of the first and second lens groups are approximately symmetrical with respect to the stop. Accordingly, the system has a high aperture ratio and small curvature of a saggital and meridional image field which can reduce an astigmatic difference in a peripheral part of an image.

REFERENCES:
patent: 3088371 (1963-05-01), Lowenthal
patent: 4540250 (1985-09-01), Seto

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