Shutter mechanism for motion picture cameras
AssigneeFuji Photo Film Co., Ltd.
InventorJiro Sekine
Life of this patent
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Abstract
A rotary shutter for a motion picture camera consists of two sector blades which are rotatable about the same shaft. The angular relative position of one sector blade to the other is fixed to have a fixed open angle thereby when a smaller open angle is desired. When a larger open angle is desired, one sector blade is fixed in the camera at a position to open an exposure aperture and only other blade is rotated. One sector blade is selectively engaged with the other sector blade or fixed in the camera by axial movement thereof.
Claims7
A rotary shutter mechanism for a motion picture camera comprising a first sector blade having an open angle rotatable about an axis to open and close an exposure aperture of the camera, a second sector blade having an open angle rotatable about said axis to open and close the aperture, an end plate extending in parallel with and in front of said sector blades, pin-and-hole engaging mechanical means for connecting the second sector blade with the first sector blade to form an open angle thereby which is smaller than the open angle of the first sector blade so that both blades rotate together to effect a shorter exposure time, and pin-and-hole engaging mechanical means for separating the second sector blade from the first sector blade and connecting the second sector blade with the end plate to hold it stationary at a position where the second sector blade fully opens said aperture so that only the first sector blade opens and closes the aperture to effect a longer exposure time.
Dependencies are inferred from the claim text.