Projection lens

Details Projection lens Projection lens

1984-06-26

1985-12-24

Corbin, John K.

G02B 958

Patent

active

045602433

ABSTRACT:
A symmetrical type projection lens comprises first lens composed of positive and negative lenses disposed in the order starting from the object side and cemented to each other. The first lens is in the form of a meniscus lens having its convex face at the object side and having a total negative focal length. The projection lens comprises a second lens which is in the form of a positive meniscus lens having its convex face at the object side, a stop, third lens which is in the form of a positive meniscus lens having its convex face at the image side, and fourth lens composed of negative and positive lenses cemented to each other and being in the form of a meniscus lens which is convex at the image side and has a total negative focal length.
The first and second lenses are symmetrically arranged respectively relative to the third and fourth lenses about the stop. The projection lens satisfies the certain conditions.

REFERENCES:
patent: 4083628 (1978-04-01), Koizumi
patent: 4159166 (1979-06-01), Kasahara et al.
patent: 4319810 (1982-03-01), Mori

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