Zoom lens system for use in microfilm projection apparatus

Details Zoom lens system for use in microfilm projection apparatus Zoom lens system for use in microfilm projection apparatus

1987-12-08

1989-06-13

Arnold, Bruce Y.

350449, G02B 1514

Patent

active

048386677

ABSTRACT:
A zoom lens system for use in microfilm projection apparatus in which the image projection is conducted in a condition of a definite object-image distance, the system comprising from the enlargement side to the reduction side, a first lens group of a positive refractive power disposed at the screen side and including an aperture stop disposed at the enlargement side of the first lens group and a second lens group of a negative refractive power disposed at the film side, wherein the first and second lens groups are moved along the optical axis while increasing a distance therebetween in an operation of zooming from the longest focal length side to the shortest focal length side.

REFERENCES:
patent: 3141921 (1964-07-01), Linke
patent: 3360325 (1967-12-01), Gustafson
patent: 4733951 (1988-03-01), Pareigat

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