Lens system for projecting images of microfilm

Details Lens system for projecting images of microfilm Lens system for projecting images of microfilm

1986-09-29

1988-12-13

Corbin, John K.

G02B 960

Patent

active

047906383

ABSTRACT:
There is disclosed a lens system for projecting images of microfilm onto a screen or the like. The lens system is characterized by five lens components, that is, a first positive meniscus lens component convex to the magnification side, a second negative meniscus lens component concave to the magnification side, a third biconvex lens component, a fourth biconcave lens component having a powerful concave surface faced to the magnification side, and a fifth biconvex lens component.

REFERENCES:
patent: 3698796 (1972-10-01), Bertele
patent: 3907418 (1975-09-01), Okuyama

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