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Overhead Projectors, Still A Widely Used Office Technology

Regardless of ubiquitous presence of high-tech equipment exactly like laptops and LCD projectors which are typically found in conferences and office meeting rooms these days, the former (old) technology used for presentations and lectures, overhead slide projectors remain as a favorite machine for most and we can still find its presence and it is usual in most places.

Creators of these kinds of projectors are always upgrading and improving this system to provide the best performance and satisfaction, this indicates that this simple projection technology will stay. An overhead projector is mainly a slide projector, a slide that is a plastic transparent sheet (often known as transparencies) is used to draw, write and print the subject matter to be presented.

When these transparent sheets are placed over the projector, the content is projected on to a screen or surface huge enough to suit the viewers. They are really simple and easy to use; the most typical kind of overhead projector consists of a light box in addition to a reflector, the light box is composed of a light, a cooling fan and a double faced Fresnel lens that also operates as a cover of the box. The reflector which is mounted on an adjustable arm is made with a mirror and a lens to focus and redirect the light.

When the slides and transparencies are positioned on the light box, the light from below passes through the slide and the reflected and enlarged image is projected onto the screen. The size of the projected image is completely proportional to the distance of the projecting surface and the projector. Also the optimum range is around 6-12 feet.

More expensive models can have even wider projection range. There are moveable (reflecting type) projector designs. They are additionally available, one can find the appropriate model that suits their requirements. These slide projectors have various benefits over any other projection system and might be extremely convenient. One also can find many used overhead projectors as well in the market which are quite inexpensive, including one of this kind of projector into the list of office equipment will be really helpful.

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