Illuminating system for test projector

DETAILED DESCRIPTION We claim: 1.
A generator of polychromatic light for a projector of multicolor images comprising: a plurality of radiant sources emitting light rays of different colors; a mixing chamber having a plurality of inlet apertures respectively irradiated by said sources with incoming beams of said different colors, said chamber being provided with a light-diffusing inner wall surface and further having an outlet aperture for emitting an outgoing beam of polychromatic light blended from the color components of said incoming beams; and a projection objective operatively aligned with said outlet aperture and with a multicolor pattern whose image is to be projected upon a receiving surface, said objective having an entrance pupil defining with said outlet aperture an illuminating area of said wall surface from which said outgoing beam originates, said sources being so oriented with reference to said inlet apertures that said incoming beams impinge upon limited zones of said wall surface offset from said illuminating area and from said outlet aperture.
2.
A generator as defined in claim 1 wherein said wall surface is spherical, said inlet apertures being angularly equispaced about a ring segment concentric with said outlet aperture.
3.
A generator as defined in claim 1 or 2 wherein said pattern is a transparency spanning said outlet aperture.
4.
A generator as defined in claim 1 or 2 wherein said sources are provided with focusing means training said incoming beams upon said limited zones.
5.
A generator as defined in claim 1 or 2 wherein said chamber is provided with shield means screening said illumination area from said incoming beams.
6.
A generator as defined in claim 1 or 2 wherein said sources comprise light conductors having entrance ends juxtaposed with respective radiators and exit ends disposed at said inlet apertures.
7.
A generator as defined in claim 6 wherein said radiators illuminate said entrance ends with maximum angles of incidence corresponding to half the vertex angle of a cone of light rays originating at said exit ends and striking said wall surface at the boundaries of said limited zones