Patent ID: 8687169

Claim:
An optical module, comprising: an aperture device comprising a plurality of aperture elements which define an opening in the aperture device configured so that during use of the optical module a first portion of light impinging on the aperture device is blocked by the aperture device and a second portion of light impinging on the aperture device passes through the opening of the aperture device, wherein: the plurality of aperture elements define a geometry of an aperture; the plurality of aperture elements comprise a first aperture element and a second aperture element; at least the first and second aperture elements, in one state of the aperture device, define a ring shaped geometry of the aperture; the aperture device is configured to modify a parameter of the first aperture element independently of the second aperture element; the modification of the first aperture element resulting in a modification of the geometry of the aperture; and the parameter comprises at least one parameter selected from the group consisting of a position of the first aperture element with respect to the second aperture element and an orientation of the first aperture element with respect to the second aperture element.