Improvements relating to optical projection systems

953,440. Reflectors. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Dec. 12, 1960 [Jan. 12, 1960], No. 1126/60. Heading F4R. [Also in Division G2] Optical system for illuminating the aperture of a projector comprises a concentrated light source 1, e.g. an Xenon discharge lamp, at the focus of an ellipsoidal...

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1. Verfasser:	CASTELLAIN ALFRED POURTALES
Format:	Patent
Sprache:	eng
Schlagworte:	ACCESSORIES THEREFOR APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY PHOTOGRAPHY PHYSICS
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Zusammenfassung:	953,440. Reflectors. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Dec. 12, 1960 [Jan. 12, 1960], No. 1126/60. Heading F4R. [Also in Division G2] Optical system for illuminating the aperture of a projector comprises a concentrated light source 1, e.g. an Xenon discharge lamp, at the focus of an ellipsoidal mirror 2, the rim 4 of which terminates in a plane C perpendicular to the system's axis and preferably passing through the mirror's focal point. In addition, at least two auxiliary mirrors are provided, each in the form of a concave annulus 6 and 7, displaced progressively from the source to intercept and re-direct to the mirror's focus light not intercepted by the ellipsoidal mirror. The rim of the auxiliary mirror closest to the source ends at, or overlaps, the plane C containing the rim of the ellipsoidal mirror. The other rim of this mirror and the rims of the other auxiliary mirrors do not interrupt any of the rays reflected by mirror 2. The Provisional Specification also discloses a system in which only one auxiliary mirror is employed.