Projectors
A film projector is an optic-mechanic device which is used to show movies, it project them in a screen. Most of the optic and mechanical components, except the concerning ones to illumination and sound, are also present in film cameras. This device consists on a point of light whose rays are picked up by a curved mirror which throws them to a transparent film, at the same time they pass through an objective (lens) that increases the luminous pictures which are projected in the screen. The projector has, the same as the photographic camera, two bobbins: a feeder that provides the film to the projector and another, the receiver that picks up the film once projected. It also has a mechanism that transforms the photographed sound in real noises. The projector system in a modern motion picture theater has five main assemblies:
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