Projector Shutter
In movie projection, the shutter admits light from the lamphouse to illuminate the film across to the projection screen. To avoid flicker, a double-bladed rotary disc shutter admits light two times per frame of film. There are also some models which are triple-bladed, and thus admit light three times per frame (see Persistence of vision).
Shutters are also used simply to regulate pulses of light, with no film being used, as in a signal lamp.
Read more about this topic: Shutter (photography)
Famous quotes containing the word shutter:
“The rays which stream through the shutter will be no longer remembered when the shutter is wholly removed.”
—Henry David Thoreau (1817–1862)