Motion picture shutter method and apparatus

Details Motion picture shutter method and apparatus Motion picture shutter method and apparatus

1984-12-28

1986-06-03

Hayes, Monroe H.

Optics: motion pictures

Shutters

Rotary

352216, G03B 910

Patent

active

045926328

ABSTRACT:
For a given shutter size, the effective illumination or light transmission period is increased by one half that of the angles subtended by the aperture. This increase is accomplished by providing, in addition to a first shutter having an opaque section in the case of a camera of at least 180.degree., a second shutter having an opaque section of an angle equal to that subtended by the aperture. The second shutter is coaxially mounted with the first shutter and caused to rotate at twice the speed of the first shutter. By initially aligning the leading edges of the shutters with the start of the aperture, the aperture is effectively covered and uncovered in half the time which would normally be required by using a single shutter providing the same film transport period alone. As a consequence, the period of illumination is increased by the referred to one-half of the angle subtended by the aperture. This value becomes significant if the shutter diameter is small relative to the aperture size since the subtended angle becomes larger.

REFERENCES:
patent: 744251 (1903-11-01), Smith
patent: 1836224 (1931-12-01), Burkhardt

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