Iris Diaphragm Having A Predetermined Shape, Without Shape Rotation

Abstract: Disclosed is an iris diaphragm having an optical axis (O) and comprising: - a fixed ring (RF); a plurality m ? N > 1 of blades (L) defining an aperture (OD) of the diaphragm with a predetermined shape, the blades being capable of moving in a plane perpendicular to the optical axis relative to the fixed ring, each blade comprising a control pin (PC); - a control ring (RC) capable of rotating about the optical axis relative to the fixed ring and comprising m control ramps (GC); and wherein each control pin (PC) is capable of moving in one of the respective control ramps by lengthwise engagement therewith, a rotation of the control ring (RC) about the optical axis causing, via the movement of the control pins (PC) in the control ramps, the blades to move relative to the fixed ring so as to modify a surface of the aperture while maintaining the predetermined shape of the aperture, without inducing rotation of the predetermined shape relative to the fixed ring.

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