Cata-dioptric type telephoto lens system

Details Cata-dioptric type telephoto lens system Cata-dioptric type telephoto lens system

1981-03-30

1983-09-13

Corbin, John K.

G02B 1708

Patent

active

044038364

ABSTRACT:
A cata-dioptric type telephoto lens system comprising a first, second, third, fourth and fifth lenses, wherein the first lens is a positive meniscus lens arranged convex toward the object side, the second lens is a negative meniscus lens arranged convex toward the image side and having a reflecting surface formed on its convex surface by leaving a transparent central portion, the third lens is a biconvex lens cemented to the surface on the image side of the first lens, the fourth lens is a biconcave lens cemented to the surface on the object side of the first lens and having a reflecting surface formed on its surface on the object side, and the fifth lens is a negative meniscus lens cemented to the surface on the object side of the second lens, the cata-dioptric type telephoto lens system being extremely light in weight and compact and having aberrations corrected favorably.

REFERENCES:
patent: 3507556 (1970-04-01), Shimizu
patent: 3632190 (1972-01-01), Shimizu
patent: 4188091 (1980-02-01), Fujii

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