Despite the ubiquitous presence of high-tech equipment like laptops and LCD projectors which can be ordinarily found in conferences and office meeting rooms today, the former (old) technology used for presentations and lectures, overhead slide projectors remain as a common gadget for many and we can still find its presence and it is common in most places.
Manufacturers of a majority of these projectors are constantly upgrading and improving this system to deliver the best performance and satisfaction, this means that this simple projection technology is going to 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 matter to be presented.
When these clear sheets are placed over the projector, the content material is projected on to a screen or surface big enough to suit the audience. They are very simple and easy to use; the most common variety of of overhead projector consists of a light box plus a reflector, the light box consists of a light, a cooling fan and a double faced Fresnel lens which also serves as a cover of the box. The reflector that is mounted on an adjustable arm consists of a mirror and a lens to focus and redirect the light.
When the slides or transparencies are positioned on top of the light box, the light coming from below passes through the slide and the reflected and enlarged image 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 between six to twelve feet.
More expensive models can have even larger projection range. There are transportable (reflecting type) projector designs. They are additionally available, one may find the appropriate model that matches their needs. These slide projectors have distinguishing advantages over any other projection system and can be incredibly functional. One may also find many
used overhead projectors as well available in the market that are quite cheap, including one of this type of projector into the list of office equipment can be extremely advantageous.
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