Regardless of ubiquitous presence of high-tech equipment just like laptops and LCD projectors that are 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 common device for most and we can still find its presence and it is usual in most places.

Producers of these types of projectors are continuously upgrading and improving this system to provide one of the best performance and satisfaction, this means that this simple projection technology is going to stay. An overhead projector is mainly a slide projector, a slide which is a plastic transparent sheet (also referred to as transparencies) is used to draw, write or print the content to be presented.

When these transparent sheets are positioned over the projector, the content material is projected on to a screen or surface large enough to suit the viewers. They are really simple and easy to use; the most typical type 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 which also acts 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 placed 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 figure is directly 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 bigger projection range. There are portable (reflecting type) projector designs. They are also available, one can find the proper model that matches their needs. These slide projectors have various advantages over any other projection system and could be very useful. One also can find a lot of used overhead projectors as well available in the market that are quite inexpensive, including one of this kind of projector into the list of office equipment may be very beneficial.

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Despite the ubiquitous presence of high-tech equipment like laptops and LCD projectors that are normally 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 device for many.

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