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US 4,904,055 AGranted
Variable aperture formed by linearly movable elements
AssigneeEastman Kodak Company
InventorMark E. Bridges
Life of this patent
Estimating the term…
Abstract
A plurality of aperture blades are each provided with an opening having a V-shaped edge, such that when the blades are superimposed they cooperate to define a six-sided aperture. The blades are each mounted for rectilinear movement by a pair of guide pins. Cam pins supported on a driver rotated by a stepper motor engage cam slots in the blades and position them rectilinearly to change the aperture size.
Claims8
Apparatus for providing an aperture in an optical path comprising:
- at least three blades having openings with sides that cooperate to define an aperture;
- means for mounting said blades for rectilinear movement to vary the size of said aperture;
- and
- cam means actuatable for simultaneously moving said blades to vary said aperture.
1 more element
Apparatus for providing an aperture in an optical path comprising:
- a pair of plates mounted together in spaced relationship;
- at least three elongated movable aperture blades positioned between said plates in overlapping relationship with each other;
- said blades having openings which cooperate to form a generally circular aperture;
- guide means mounted on one of said plates for restricting each of said blades to axial rectilinear movement;
- and
- cam means mounted on one of said plates for simultaneously moving said blades rectilinearly to vary the size of said aperture.
3 more elements
Dependencies are inferred from the claim text.