Even with the ubiquitous existence of high-tech equipment exactly like laptops and LCD projectors that are typically 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 normal in a number of places.

Creators of these types of projectors are always 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 that is a plastic clear sheet (often known as transparencies) is used to draw, write or print the subject matter 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 quite simple and easy to work with; the most typical type of overhead projector consists of a light box in addition to 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 is created with a mirror and a lens to target and redirect the light.

When the slides and transparencies are placed on 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 from 6 to 12 feet.

More expensive types can have even wider projection range. There are portable (reflecting type) projector designs. They are additionally available, one can find the right model that matches their requirements. These slide projectors have distinguishing benefits over any projection system and might be very convenient. One also can find lots of used overhead projectors as well available in the market which are quite cheap, including one of this sort of projector into the list of workplace equipment will be very helpful.

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