Despite the ubiquitous existence of high-tech equipment just like laptops and LCD projectors which 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 gadget for many and we can still find its presence and it is common in a number of places.

Producers of these kinds 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 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 and 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 big enough to suit the audience. They are very simple and easy to work with; the most typical kind 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 serves 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 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 figure is exactly 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 bigger projection range. There are moveable (reflecting type) projector designs. They are also available, one can find the right model that matches their requirements. These slide projectors have distinguishing advantages over any projection system and could be extremely useful. One can also find lots of used overhead projectors as well available in the market which are quite cheap, including one of this type of projector into the list of workplace equipment may be really beneficial.

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