Projection apparatus for automatic correction of non-uniform ill

Details Projection apparatus for automatic correction of non-uniform ill Projection apparatus for automatic correction of non-uniform ill

1983-06-24

1985-05-28

Moses, R. L.

Photocopying

Including fiber optics

355 14E, 355 71, G03G 1500

Patent

active

045196940

ABSTRACT:
The present invention provides an apparatus for projecting the image of an original on the projection surface of a screen or photosensitive member, the apparatus having an illumination correction device for changing a distribution of illuminance on the projected surface, the illumination correction device being adapted to process a difference between the amount of a light passing near the center of the projection optical path and the amount of a light passing near the marginal portion of the same optical path to obtain the results on which the illumination correcting device will be controlled to correct any irregularity of the illuminance distribution on the projected surface.

REFERENCES:
patent: 3922085 (1975-11-01), Sheets
patent: 4041308 (1977-08-01), Fujita
patent: 4054890 (1977-10-01), Shimomura
patent: 4153364 (1979-05-01), Suzuki et al.
patent: 4256372 (1981-03-01), Yasukuni et al.
patent: 4306787 (1981-12-01), Fukuhara et al.
patent: 4333720 (1982-06-01), Suzuki et al.

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