Motion picture film projector
AssigneeEastman Kodak Company
InventorsFranklin D. Ehrne, Andrew F. Kurtz
Life of this patent
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Abstract
An improved motion picture film projector (100) comprises a Geneva Mechanism (120), which intermittently drives a film (114). A light source (116) projects light through the film (114) and a shutter (106) periodically interrupts the light source (116). The shutter (106) has a blade with a shaped edge, which matches the frame shape on the film (114) thus, increasing the amount of light that is transmitted through the film (114). A second edge of the blade also matches the frame shape on the film (114) further increasing the amount of light transmitted through the film (114).
Claims20
An improved motion picture film projector comprising:
- a Geneva Mechanism for intermittently driving a film comprised of multiple frames;
- a light source which illuminate said film with incident light;
- beam shaping optics located between said light source and said film for shaping said incident light;
- an aperture which defines each of said frames;
- a projection lens for imaging each of said frames to an image plane;
- a shutter comprising at least one blade having a leading edge and a trailing edge for periodically interrupting said incident light on said film from said light source;
- and
- wherein at least one of said edges has a shape which matches a shape of said aperture.
An improved motion picture film projector comprising:
- a Geneva Mechanism for intermittently driving a film comprised of a plurality of frames;
- a light source which illuminate said film with incident light;
- beam shaping optics located between said light source and said film for shaping said incident light;
- an aperture which defines each of said frames;
- a projection lens for imaging each of said frames to an image plane;
- a shutter comprising at least one blade having a leading edge and a trailing edge for periodically interrupting said incident light on said film from said light source;
- and
- wherein said leading and trailing edges have shapes which match a shape of said aperture.
Dependencies are inferred from the claim text.