Patent ID: 7995039

Claim:
A system for determining a position of an object adapted to reflect/scatter/emit radiation, the system comprising: a radiation transmissive element having a first surface being adapted to be engaged by the object so as to reflect/scatter/emit radiation into the element, and a second surface opposite to the first surface, the radiation transmissive element being adapted to guide reflected/scattered/emitted radiation therein by total internal reflection along a first part of a radiation path extending from the object towards a radiation detector; said radiation detector having an at least one-dimensional detecting surface and being adapted to detect radiation through the first and/or the second surface, which radiation is reflected/scattered/emitted by the object, and to output a signal relating to the detected radiation; and at least one radiation modulator being provided in the first part of the radiation path and adapted to prevent at least a part of the reflected/scattered/emitted radiation from propagating to the radiation detector, said at least one radiation modulator being positioned on or at the first and/or the second surface and defining, in the plane of the first and/or second surface, a plurality of areas, one or more first of the areas allowing or facilitating reflection of radiation travelling in the radiation transmissive element back into the radiation transmissive element, and one or more second of the areas preventing reflection of radiation travelling in the radiation transmissive element back into the radiation transmissive element.