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Consumer Electronics by S. P. Bali

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WORKING OF A PROJECTOR

In the simplest terms, a projector consists of two spools—one to hold the film and another to take it up-some form of transport mechanism, a lamp to illuminate the image and a lens. This is made from several pieces of curved glass, each of different thicknesses and optical properties. Light from the lamp shines through the image, inverts and focuses it on to the screen. The film comes off the supply reel and is threaded on to a guide path through the gate mechanism—between the lamp housing and the lens and so on to the take-up reel, Fig. 27.11.

The gate is one of the most important parts of the projector, in which each frame in turn is stopped for an instant to allow the shutter to open and light to pass through. Basically, ...

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