Behind diaphragm lens

Details Behind diaphragm lens Behind diaphragm lens

1982-09-27

1984-07-03

Corbin, John K.

G02B 934

Patent

active

044575963

ABSTRACT:
In a four-unit five-lens system wherein in succession from the object side, each of a first lens and a second lens comprises a positive meniscus lens having its convex surface facing the object side, a third lens comprises a biconcave lens, a fourth lens comprises a biconvex lens, a fifth lens comprises a negative meniscus lens having its convex surface facing the image side, the fourth lens and the fifth lens being cemented together to form a positive cemented lens, and a diaphragm is provided most adjacent to the image side, a behind diaphragm lens satisfies certain conditions.

REFERENCES:
patent: 3848972 (1974-11-01), Nakamura
patent: 4063802 (1977-12-01), Imai et al.
patent: 4232945 (1980-11-01), Hyakumura

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