Overhead Projectors, Still A Very Useful Office Tool

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 presentations and lectures, overhead slide projectors remain as a common device for most and we can still find its presence and it is common in a number of places.

Producers of these kind of projectors are continuously upgrading and improving this system to provide 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 clear sheet (also called transparencies) is used to draw, write and print the content to be presented.

When these transparent sheets are placed over the projector, the content material is projected on to a screen or surface large enough to suit the viewers. They are very simple and easy to work with; the most common kind of overhead projector consists of a light box and a reflector, the light box is composed of a light, a cooling fan and a double faced Fresnel lens which also acts as a cover of the box. The reflector which is mounted on an adjustable arm consists of a mirror and a lens to target and redirect the light.

When the slides or transparencies are placed over the light box, the light from below passes through the slide and the reflected and enlarged image 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 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 proper model that matches their needs. These slide projectors have various advantages over any projection system and could be really 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 type of projector into the list of workplace equipment could be really beneficial.

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