Abstract: A projector is provided with a lamp including an arc tube, which generates light, and a reflector. The reflector includes an inner surface that reflects light from the arc tube and an opposite outer surface. The arc tube and the inner surface define an inner portion of the lamp. At least the outer surface defines an outer portion of the lamp. A housing accommodates the lamp and includes an air inlet through which air is drawn in from outside the housing. An air mixing structure mixes a cooling current that has cooled the inner portion of the lamp with the air drawn into the housing through the air inlet. A cooling current guide structure guides the cooling current mixed with the air mixing structure to the outer portion of the lamp.

Abstract: In an optical engine for a projection system, a fan unit is mounted on an upper surface of a housing, and has an inlet port facing toward light modulators within the housing for drawing air upwardly so as to dissipate heat generated by the light modulators, and an outlet port that is transverse to the inlet port for discharging the air drawn into the inlet port.

Abstract: An apparatus is described for projecting a motion picture image on a screen that extends 360.degree. around the viewers, by moving a film past a slit through which light shines, forming an image of the slit on the screen, and rapidly revolving the slit image around the screen. The film moves rapidly enough to permit the projected slit image to rotate around the screen at a rate of at least about 50 rotations per second. The film, which moves continuously, can be free of sprocket holes and can be driven by a capstan drive, and the film can have a thickness less than half the thickness of present film stock so that a roll of film of moderate diameter can last several minutes.

Abstract: A chassis for a motion picture projector which includes an audio amplifier portion for producing an audio signal related to the images on the film. The chassis mounts the mechanical and electrical components of the projector. The chassis is a unitary casted structure which includes mounting platforms for the amplifier and the transformer, and an air flow directing means for more effectively and efficiently cooling of the electrical components to provide a lower operating temperature for the projector. A plurality of fins are provided on the chassis for conducting heat away from the transformer and a plurality of slots are provided to cause air flow directly across the amplifier section. A pair of depending, toothed flanges are provided on opposite ends of the chassis for introducing air onto the fins and through the slots to the heated electrical components.