In an illumination optical system; a wavelength separating optical system; plural light modulation devices provided respectively so as to modulate the light in the plural wavelength regions according to a given image signal; a light synthesizing optical system for synthesizing the light modulated by the plural light modulation devices; a projection optical system for projecting the synthesized light emitted; and a reflecting mirror placed in the optical path. Light with a wavelength of approxima...

A projector is often positioned so that its optical axis is at an imperfect orthogonal angle with respect to a projection screen. This position causes a keystone distortion as well as imperfect focus in the projected image. To correct these undesirable problems, initially, a lens and/or an image-forming plate is independently repositioned to bring the projected image into focus based upon user input data. The keystone distortion is also corrected by redrawing the image on an image-forming surfac...

An optical illumination system for a projection-type display unit is disclosed wherein multiple light sources are oriented so as to cause the optical axes of their emitted light beams to be non-parallel to one another and to overlap at a first lenticular lens array of an integrator section. The function of the integrator section is to make the light from the multiple light sources even, and to serve as a secondary light source in the projection-type display unit. The overlapping of the light bea...

An optical device for projection display system comprising: a LCD projector, a luminescent spot projector for forming a luminescent spot on a screen, a luminescent spot extracting means for extracting light from the luminescent spot out of a reflected light from the screen, a luminescent spot detecting means for detecting the reflected luminescent spot and a luminescent control means for controlling a display image forming operation of the LCD projector based on the detection signal wherein the ...

A dual band optical system for a framing aerial reconnaissance camera is described. The camera including at least two two-dimensional image recording media for generating frames of imagery of a scene external of an aerial reconnaissance vehicle carrying the camera. The camera includes a Cassegrain optical system forming an objective lens for the optical system, including a a primary mirror having a central aperture and a secondary mirror. The primary and secondary mirrors are aligned along an ob...

The invention concerns simplify positioning and fixing operation of a prism unit and a liquid-crystal-panel unit, and a projection display device that reduces a shift of pixels. The projection display device may include a fixed frame plate fixed adjacent to a surface of a prism unit and a center portion thereof being opened, a panel frame body for holding liquid crystal panels, and a spacer having a plane opposed to the fixed frame plate and a plane opposed to the panel frame body, and placed be...

The invention provides a light source device of an easy maintenance, and a projector using the light source device. The light source device includes a light source lamp, a reflector, a lamp housing for covering substantially entirely almost the outer surface except for an opening plane of the reflector and a front glass for covering the opening plane of the reflector. The light source device is formed so as to be integrally exchangeable as a unit in the projector. Since the lamp housing covers a...

A projector includes a source of polychromatic light that propagates through color filter segments of a color wheel and enters an input aperture of an asymmetrical light integrating tunnel that integrates the filtered light into a uniform pattern at a nonrectangular output aperture of the tunnel. The uniform illumination exiting the nonrectangular output aperture is re-imaged onto a light valve that is mounted obliquely to a longitudinal axis of the tunnel. The image of the nonrectangular output...

For providing the image projecting system capable of substantially superimposing images without image blur which are provided from a plurality of image projecting apparatus when the original images are superimposed using the plurality of image projecting apparatus, distortion value of distortion aberration of images from projecting optical system comprised in the image projecting system is made substantially coincided in a region of using image height.

Projection system comprising at least two light sources, a projection lens and a spatial light modulator located between the light sources and the projection lens, which light modulator comprises a plurality of light-deflection devices each provided with an element which is tiltable about a tilt axis. The light sources are arranged with respect to the spatial light modulator in such a way that, in operation, the centers of the light beams coming from the light sources and projected on each eleme...