Illuminating system for test projector

Details Illuminating system for test projector Illuminating system for test projector

1982-05-07

1983-05-24

Shepperd, John W.

Optics: image projectors

Composite projected image

Multicolor picture

353122, 353 84, 362231, 358 10, 350174, G03B 2100

Patent

active

043847692

ABSTRACT:
A generator of polychromatic light for a projector of a multicolor image, e.g. as used in the testing of a color-television camera, comprises a spherical mixing chamber with three inlet apertures angularly equispaced about an outlet aperture spanned by a transparent test pattern and with a light-diffusing inner wall surface designed to emit a blend of several color components radiated into it from respective sources. A projection objective juxtaposed with the outlet aperture defines with that aperture and with its own entrance pupil a light cone determining a concave illuminating area of circular outline on the chamber wall; the differently colored light beams radiated into the chamber impinge upon limited wall zones offset from this illuminating area in order to homogenize the outgoing polychromatic beam. The luminous intensity of the outgoing beam is stabilized by a control of the light emission from each source with the aid of photodetectors individually irradiated by these sources or of a single photodetector receiving light reflected from the interior of the chamber.

REFERENCES:
patent: 2342115 (1944-02-01), Blauvelt
patent: 2589569 (1952-03-01), Peter et al.
patent: 3327583 (1967-06-01), Vanderschmidt et al.
patent: 3794424 (1974-02-01), Eickhorst et al.
patent: 4237475 (1980-12-01), Sekiguchi
patent: 4308551 (1981-12-01), Ohnuma et al.

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