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

1988-04-21

1989-09-12

Arnold, Bruce Y.

350449, G02B 1514, G02B 960, G02B 962

Patent

active

048654310

ABSTRACT:
The disclosure relates to a zoom lens system for use in an image projecting apparatus with Kohler illumination. In this system, an aperture stop is movably provided relative to the movement of a first and second lens groups in an operation of zooming so as to make a pupil position of the zoom lens system at a reduction side invariable, with the result that Kohler illumination system is not moved.

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

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