Illumination control apparatus for projection device

Details Illumination control apparatus for projection device Illumination control apparatus for projection device

1979-11-26

1981-07-14

Shepperd, John W.

Optics: image projectors

Lamp control

353 87, 355 69, G03B 2120

Patent

active

042783348

ABSTRACT:
An illumination control apparatus for a device for projecting images at a variable magnification, comprises a light source unit for illuminating an object and a condenser lens unit at least one of the units being movable along the optical axis of projection, with the power supply to the light source unit being varied with such movement. When the magnification of projection of the device is varied, at least one of the units is shifted with a variation of the power supplied to the light source to provide a constant illumination and a uniform distribution of illuminations to the plane of the projected image of an object irrespective of a variation in the projection magnification.

REFERENCES:
patent: 2878718 (1959-03-01), Post
patent: 2937569 (1960-05-01), Wilton
patent: 3472586 (1969-10-01), Zuili
patent: 3510220 (1970-05-01), Bures
patent: 3815992 (1974-06-01), Ogawa
patent: 3818216 (1974-06-01), Larraburu
patent: 4029956 (1977-06-01), Leibundgu
patent: 4113378 (1978-09-01), Wirtz
patent: 4172657 (1979-10-01), Watanabe et al.

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