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Overhead Projectors, Not An Obsolete Device
Even with the ubiquitous presence of high-tech equipment just like laptops and LCD projectors which can be normally found in conferences and office meeting rooms these days, the former (old) technology used for shows and lectures, overhead slide projectors remain as a common gadget for many and we can still find its presence and it is normal in most places.
Producers of a majority of these projectors are continuously upgrading and improving this system to provide one of the best performance and satisfaction, this means that this simple projection technology will stay. An overhead projector is basically a slide projector, a slide that is a plastic transparent sheet (also referred to as transparencies) is used to draw, write as well as print the content to be presented.
When these transparent sheets are positioned over the projector, the content material is projected on to a screen or surface big enough to suit the audience. They are quite simple and easy to use; the most typical variety of of overhead projector consists of a light box and a reflector, the light box is composed of a light, a cooling fan in addition to a double faced Fresnel lens which also serves as a cover of the box. The reflector that is mounted on an adjustable arm is created with a mirror and a lens to focus and redirect the light.
When the slides and transparencies are positioned over 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 figure is exactly proportional to the distance of the projecting surface and the projector. And the optimum range is from 6 to 12 feet.
More expensive models can have even bigger projection range. There are transportable (reflecting type) projector designs. They are also available, one can find the right model that matches their requirements. These slide projectors have distinguishing benefits over any other projection system and could be incredibly useful. One can also find lots of used overhead projectors as well available in the market which are quite cheap, including one of this sort of projector into the list of office equipment may be extremely beneficial.
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