Overhead Projectors, Still A Widely Used Office Tool

Regardless of ubiquitous presence of high-tech equipment just like laptops and LCD projectors which are usually found in conferences and office meeting rooms nowadays, the former (old) technology used for shows and lectures, overhead slide projectors remain as a popular device for most and we can still find its presence and it is normal in many places.

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

When these clear sheets are placed over the projector, the content is projected on to a screen or surface large enough to suit the audience. They are quite simple and easy to work with; the most typical variety of of overhead projector consists of a light box in addition to a reflector, the light box is made of a light, a cooling fan and a double faced Fresnel lens which also operates as a cover of the box. The reflector that is mounted on an adjustable arm is made with a mirror and a lens to target and redirect the light.

When the slides or 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 picture is exactly proportional to the distance of the projecting surface and the projector. Also the optimum range is around 6-12 feet.

More expensive models can have even wider projection range. There are transportable (reflecting type) projector designs. They are additionally available, one may find the appropriate model that suits their requirements. These slide projectors have distinguishing advantages over some other projection system and could be very useful. One can even find numerous used overhead projectors as well available in the market which are quite cheap, including one of this kind of projector into the list of workplace equipment can be very beneficial.