Abstract: An improvement to video projectors having a reflector/lamp for compressing light to a focal point at a predetermined f/#, an integrating rod positioned at the focal point to collect and integrate the light, and a detector for sensing light output from the integrating rod, the improvement comprising a converging lens positioned between the reflector/lamp and the integrating rod for compressing the focal point so as to increase the amount of light entering the integrating rod while consequentially decreasing said f/#, and a diverging lens for increasing the focal point within the integrating rod so as to restore said predetermined f/#. Preferably, the diverging lens is fabricated from gradient index glass.

Abstract: An apparatus for collecting and sensing light in a projector, comprising a cold mirror positioned directly in the incident light path from a lamp and illumination optics of the projector for reflecting a large portion of visible light towards a light imaging device while transmitting IR and UV light and a small portion of the visible light; a secondary mirror for reflecting the small portion of the visible light, an integrating box positioned to collect and integrate the small portion of visible light, a light tube in optical communication with the integrating box for further integrating and attenuating the small portion of visible light, and an electro-optic device within the light tube for measuring the small portion of visible light within the light tube and generating an electrical signal in response thereto.

Abstract: An improvement video projectors having a reflector/lamp for compressing light to a focal point at a predetermined f/#, an integrating rod positioned at the focal point to collect and integrate the light, and a detector for sensing light output from the integrating rod, the improvement comprising a converging lens positioned between the reflector/lamp and the integrating rod for compressing the focal point so as to increase the amount of light entering the integrating rod while consequentially decreasing said f/#, and a diverging lens for increasing the focal point within the integrating rod so as to restore said predetermined f/#. Preferably, the diverging lens is fabricated from gradient index glass.

Abstract: An optical integrator, comprising a solid integrator rod for internally reflecting light from an illumination source and transmitting the reflected light through an exit face thereof as a rectangular beam according to a predetermined aspect ratio, and a rectangular precision metal aperture with mirrored wall surfaces for extending the focal plane of the solid integrator rod beyond the exit face.