Regardless of ubiquitous occurrence of high-tech equipment just like laptops and LCD projectors which can be normally found in conferences and office meeting rooms these days, the former (old) technology used for shows and lectures, overhead slide projectors remain as a favorite device for many and we can still find its presence and it is usual in many places.

Producers of a majority of these projectors are continuously upgrading and improving this system to provide one of the best performance and satisfaction, this indicates that this simple projection technology is going to 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 as well as print the content to be presented.

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

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

More expensive brands can have even bigger projection range. There are transportable (reflecting type) projector designs. They are also available, one can find the right model that suits their needs. These slide projectors have distinguishing advantages over some other projection system and could be incredibly useful. One can also find lots of used overhead projectors as well in the market that are quite cheap, including one of this kind of projector into the list of workplace equipment may be extremely beneficial.

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