An introduction to projectors

A projector is a device for presenting an enlarged image on a screen from a transparency, such as a photographic slide or film. In a moving image projector, each frame is held stationary in an illuminated opening for a brief period and then advanced by an intermittent sprocket or reciprocating claw, and a rotating shutter cuts off the light during movement. The film’s soundtrack is played on a separate sound head where the film continuously moves at a constant speed.

An average projector typically has an image resolution of 800 x 600 pixels. Most projectors weigh four to six pounds and come with a carrying case. All projectors have varying levels of brightness and contrast; Usually the brightness ranges from 1300 lumens to 1500 lumens. A projector with a brightness of 1400 lumens proves to be a good option for small to medium sized well-lit rooms.

Some of the indispensable parts of a projector are the power spool, xenon arc lamp, projection lens, optical sound head, take-up spool, aperture, normal lens, and rotary shutter. But with the advancement of science, new technologies have come into play. Projectors have become much more advanced in terms of image clarity and pixel quality. Additionally, projectors have found use in everyday households as new versions of home projectors have hit the market. The abundance of LCD projectors, DLP projectors and video projectors has allowed the common man to enjoy the experience of a large movie theater in his living room.

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