Projector lamp
Digital projectors utilize high intensity lamps and reflectors to generate the light needed for projection. Projector lamps (bulbs) for optical projectors are generally of the high intensity discharge (HID) type in which an arc is formed between two electrodes, the electrodes being positioned at opposite ends of a tubular envelope with a gap between them. The reflectors generally surround the light sources in order to concentrate the desired components of the beam of light and render the image large enough and bright enough to be viewed by large numbers of viewers. The reflector is made of glass or the like from the viewpoint of heat resistance and efficiency of reflection, so that the reflector may possibly get broken if fixed by machine screws. The light from the lamp is reflected from a reflector and focused on an image gate, for example, an LCD (liquid crystal display) plate, a slide projector film gate or motion picture film gate. High-pressure mercury vapor discharge lamps are known to have a high luminance and therefore utilized for a light source of such optical devices as a liquid crystal projector, with the lamp being positioned so that the light emitting region (arc) is located at the focal point of a reflector mirror such as a parabolic mirror. The combination of the projector lamp and reflector is often referred to as a light engine. Projector systems often include a lamp receiver for coupling the light engine to the projector system.
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