Illumination transmission system for format adaptation in projec

Details Illumination transmission system for format adaptation in projec Illumination transmission system for format adaptation in projec

1979-05-22

1985-03-19

Corbin, John K.

350415, G02B 1322, G02B 2100

Patent

active

045055548

ABSTRACT:
The illumination of the regular window of a projector is transmitted by two positive acting lens groups of which the first one collects the illumination in the window and provides a near-parallel, slightly diverging beam; the second lens group receives the beam and is situated so that the window and the center of the objective are located in conjugate planes as to that second group alone; the second projector window to be illuminated is situated between the objective and the second lens group. The system is invariant to distance changes between the groups for the purpose of adaptation to different distances between the windows.

REFERENCES:
patent: 2510419 (1950-06-01), Ross
patent: 2959099 (1960-11-01), Billard et al.

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