Great aperture ratio lens

Details Great aperture ratio lens Great aperture ratio lens

1982-03-22

1984-05-15

Corbin, John K.

G02B 962

Patent

active

044484976

ABSTRACT:
A great aperture ratio lens includes a first lens which is a positive meniscus lens having its convex surface facing the object side, a second lens which is a positive meniscus lens having its convex surface facing the object side, a third lens which is a negative meniscus lens having its convex surface facing the object side, a fourth lens which is a negative lens having its concave surface facing the object side, a fifth lens which is a positive lens having its convex surface facing the image side, a sixth lens which is a positive meniscus lens having its convex surface facing the image side, and a seventh lens which is a positive lens. The fourth lens and the fifth lens are cemented to each other. The great aperture ratio lens satisfies certain conditions.

REFERENCES:
patent: 3738736 (1973-06-01), Shimizu
patent: 3743387 (1973-07-01), Nakagawa
patent: 3984155 (1976-10-01), Nakagawa
patent: 4099843 (1978-07-01), Imai
patent: 4110007 (1978-08-01), Ikeda
patent: 4247171 (1981-01-01), Tsuji
patent: 4364643 (1982-12-01), Momiyama

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