Overhead Projectors, Not An Invalid Technology

Despite the ubiquitous existence of high-tech equipment like laptops and LCD projectors that are usually found in conferences and office meeting rooms today, the former (old) technology used for displays and lectures, overhead slide projectors remain as a favorite device for most and we can still find its presence and it is common in a number of places.

Manufacturers of these types of projectors are constantly upgrading and improving this system to deliver the very best performance and satisfaction, this indicates 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 known as transparencies) is used to draw, write or print the matter to be presented.

When these clear sheets are put over the projector, the content 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 type of overhead projector consists of a light box plus a reflector, the light box consists of a light, a cooling fan as well as a double faced Fresnel lens that 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 on top of the light box, the light coming from below passes through the slide and the reflected and enlarged figure is projected onto the screen. The size of the projected image 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 larger projection range. There are portable (reflecting type) projector designs. They are also available, one may find the correct model that suits their needs. These slide projectors have various advantages over any projection system and can be very functional. One could also find numerous used overhead projectors as well in the market that are quite inexpensive, including one of this type of projector into the list of workplace equipment can be very advantageous.

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