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Overhead Projectors, Not An Invalid Device
Regardless of ubiquitous occurrence of high-tech equipment like laptops and LCD projectors which are usually found in conferences and office meeting rooms today, the former (old) technology used for presentations and lectures, overhead slide projectors remain as a common device for a lot of and we can still find its presence and it is usual in many places.Manufacturers of these kinds of projectors are constantly upgrading and improving this system to deliver the best performance and satisfaction, this means that this simple projection technology is going to stay. An overhead projector is principally a slide projector, a slide which is a plastic transparent sheet (also known as transparencies) is used to draw, write and print the matter to be presented.
When these clear sheets are placed over the projector, the content material is projected on to a screen or surface large enough to suit the spectators. They are really simple and easy to make use of; the most common kind of overhead projector consists of a light box plus a reflector, the light box consists of a light, a cooling fan and a double faced Fresnel lens which also acts as a cover of the box. The reflector that's mounted on an adjustable arm is made with a mirror and a lens to concentrate and redirect the light.
When the slides or transparencies are positioned on top of the light box, the light coming from below passes through the slide and the reflected and enlarged image is projected onto the screen. The size of the projected figure is directly proportional to the distance of the projecting surface and the projector. Furthermore the optimum range is around 6-12 feet.
More expensive brands can have even larger projection range. There are moveable (reflecting type) projector designs. They are also available, one may find the appropriate model that matches their needs. These slide projectors have different advantages over some other projection system and can be extremely functional. One could also find many used overhead projectors as well available in the market that are quite affordable, including one of this kind of projector into the list of office equipment can be really advantageous.
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