Overhead Projectors, Still A Popular Office Technology
Regardless of ubiquitous occurrence of high-tech equipment like laptops and LCD projectors which can be usually 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 usual in many places.
Manufacturers of these kinds 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 transparent sheet (also known as transparencies) is used to draw, write as well as 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 really simple and easy to make use of; the most common variety of 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 is made with a mirror and a lens to concentrate and redirect the light.
When the slides or transparencies are positioned 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 around 6-12 feet.
More expensive brands can have even larger projection range. There are transportable (reflecting type) projector designs. They are also available, one can find the appropriate model that matches their needs. These slide projectors have various advantages over some other projection system and can be extremely useful. One also can find many used overhead projectors as well available in the market that are quite inexpensive, including one of this kind of projector into the list of office equipment can be extremely beneficial.
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