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Overhead Projectors, Still A Popular Office Technology

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

Creators of these types of projectors are constantly upgrading and improving this system to provide the very 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 that is a plastic transparent sheet (often known as transparencies) is used to draw, write or print the matter to be presented.

When these transparent sheets are put 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 use; the most typical type of overhead projector consists of a light box plus a reflector, the light box is composed of a light, a cooling fan as well as 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 focus and redirect the light.

When the slides and transparencies are placed on top of the light box, the light from below passes through the slide and the reflected and enlarged figure 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 models can have even wider projection range. There are portable (reflecting type) projector designs. They are additionally available, one can find the correct model that suits their needs. These slide projectors have distinguishing benefits over any other projection system and might be very functional. One also can find numerous used overhead projectors as well in the market that are quite cheap, including one of this kind of projector into the list of office equipment will be very advantageous.

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