Lens system having aberrations corrected at near distance focusi

Details Lens system having aberrations corrected at near distance focusi Lens system having aberrations corrected at near distance focusi

1981-12-23

1988-05-31

Corbin, John K.

350465, G02B 962, G02B 960

Patent

active

047476770

ABSTRACT:
A lens system comprising a front lens group consisting of a first, second and third lens components respectively of positive meniscus lenses with the convex surfaces on the object side and a fourth lens component of a negative meniscus lens and a rear lens group consisting of a fifth lens component of a positive or negative cemented meniscus lens with the convex surfaces on the image side and a sixth lens component of a positive lens. In this lens system, the entire lens system is moved along an optical axis to focus and an airspace between the fourth and fifth lens component and an airspace between the fifth and sixth lens components are respectively varied non-linearly to correct the collapse of aberrations. The front lens group may consist of a first lens component of a positive lens, a second lens component of a negative lens and a third lens component of a positive lens and the rear lens group may consist of a fourth lens component of a negative lens and a fifth lens component of a positive lens. In this case, an airspace between the third and fourth lens components and an airspace between the fourth and fifth lens components are respectively varied non-linearly to correct the collapse of aberrations.

REFERENCES:
patent: 3883228 (1975-05-01), Betensky
patent: 4126378 (1978-11-01), Ogino
patent: 4165916 (1979-08-01), Nakamura
patent: 4198127 (1980-04-01), Itoh
patent: 4464023 (1984-08-01), Kato et al.

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