Overhead Projectors, Not An Invalid Technology Despite the ubiquitous existence of high-tech equipment exactly like laptops and LCD projectors that are typically found in conferences and office meeting rooms today, the former (old) technology used for displays and lectures, overhead slide projectors remain as a favorite machine for many and we can still find its presence and it is common in a number of places. Creators of these kind of projectors are always upgrading and improving this system to deliver the very best performance and satisfaction, this indicates that this simple projection technology will stay. An overhead projector is basically a slide projector, a slide which is a plastic clear sheet (also referred to as transparencies) is used to draw, write or print the subject matter to be presented. When these clear sheets are put over the projector, the content is projected on to a screen or surface huge enough to suit the audience. They are very simple and easy to work with; the most typical type of overhead projector consists of a light box in addition to a reflector, the light box consists of a light, a cooling fan as well as a double faced Fresnel lens that also operates as a cover of the box. The reflector that is mounted on an adjustable arm consists of a mirror and a lens to target and redirect the light. When the slides and transparencies are placed on the light box, the light coming from below passes through the slide and the reflected and enlarged figure is projected onto the screen. The size of the projected image is completely proportional to the distance of the projecting surface and the projector. And the optimum range is between six to twelve feet. More expensive types can have even wider projection range. There are portable (reflecting type) projector designs. They are additionally available, one may find the correct model that suits their requirements. 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