Modified gauss type lens system

Details Modified gauss type lens system Modified gauss type lens system

1978-03-15

1980-01-08

Clark, Conrad J.

G02B 962

Patent

active

041825500

ABSTRACT:
An improved Gauss type lens system having a relatively large aperture ratio is provided. The lens system comprises seven components between object and image as follows; a first positive meniscus lens element, a second positive meniscus lens element, a third negative meniscus lens element, a fourth meniscus shaped doublet, a fifth positive meniscus lens element, and a sixth positive lens element. The entire lens system is capable of providing a relative aperture of F No. 1.2, an angle of view of 50.degree. and a back focus at least 0.7 times the overall focal length of the lens system.

REFERENCES:
patent: 3552829 (1971-01-01), Marquardt
patent: 3738736 (1973-06-01), Shimizu
patent: 4094588 (1978-06-01), Nakagawa

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