Variable aperture formed by linearly movable elements
First Claim
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1. 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.
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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.
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Citations
8 Claims
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1. Apparatus for providing an aperture in an optical path comprising:
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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. - View Dependent Claims (2, 3, 4, 5)
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6. Apparatus for providing an aperture in an optical path comprising:
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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. - View Dependent Claims (7, 8)
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Specification