Zoom lens system for use in an image projecting apparatus with k

Details Zoom lens system for use in an image projecting apparatus with k Zoom lens system for use in an image projecting apparatus with k

1988-05-24

1990-03-20

Sugarman, Scott J.

350426, G02B 1516, G02B 15177

Patent

active

049096150

ABSTRACT:
A zoom lens system for use in an image projecting apparatus with Kohler illumination in which an image on an object plane is enlargingly projected by the zoom lens system to an image plane apart from the object plane at a definite distance. The zoom lens system comprises a first lens group and a second lens group being disposed in this order from the image plane and both being movable along the optical axis for zooming and an aperture stop being disposed between the first and second lens groups. The aperture stop is independently moved along the optical axis so as to make the pupil position at the reduction side substantially invariable in an operation of zooming, with the result that the condition of Kohler illumination system is satisfied without changing the position of a condensing lens system.

REFERENCES:
patent: 4113344 (1978-09-01), Shoemaker
patent: 4278334 (1981-07-01), Maeda
patent: 4433906 (1984-02-01), Nakatami et al.

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