Even with the ubiquitous existence of high-tech equipment like laptops and LCD projectors which can be ordinarily found in conferences and office meeting rooms today, the former (old) technology used for displays and lectures, overhead slide projectors remain as a favorite gadget for many and we can still find its presence and it is normal in a number of places.

Manufacturers of a majority of these projectors are constantly upgrading and improving this system to deliver the very best performance and satisfaction, this indicates that this simple projection technology will stay. An overhead projector is basically a slide projector, a slide that is a plastic clear sheet (also known as transparencies) is used to draw, write as well as print the matter to be presented.

When these clear sheets are put over the projector, the content is projected on to a screen or surface big enough to suit the audience. They are quite simple and easy to work with; the most common variety of of overhead projector consists of a light box plus a reflector, the light box consists of a light, a cooling fan as well as a double faced Fresnel lens that also serves as a cover of the box. The reflector that is mounted on an adjustable arm is created with a mirror and a lens to target 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 figure is projected onto the screen. The size of the projected image is exactly proportional to the distance of the projecting surface and the projector. And the optimum range is from 6 to 12 feet.

More expensive types can have even larger projection range. There are transportable (reflecting type) projector designs. They are additionally available, one may find the right model that suits their requirements. These slide projectors have distinguishing benefits over any projection system and can be incredibly functional. One may also find lots of used overhead projectors as well in the market which are quite cheap, including one of this sort of projector into the list of workplace equipment can be extremely advantageous.

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