Patent ID: 7442914
Filing Date: 2008-10-28
Classification: G06F

Abstract:
1. A system for determining a position of an radiation emitting element, the system comprising: a radiation transmissive member adapted to receive, at a surface thereof, radiation emitted by the emitting element and adapted to guide radiation therein by total internal reflection, an at least one-dimensional detector including a plurality of individual elements each being adapted to detect radiation and to provide a corresponding signal, the detector being adapted to receive radiation from a first edge part of the radiation transmissive member, and a reflecting element at a second edge part of the radiation transmissive member, the reflecting element being adapted to reflect light incident thereon from inside the radiation transmissive member back into the radiation transmissive member and adapted to reflect radiation emitted from the emitting element toward the detecting elements of the detector, the detector includes one or more apertures, pinholes, or lenses provided between the detecting elements and the emitting element, and between the detecting elements and the reflecting element, and a device for determining the position of the emitting element, on the basis of the signal of the detector relating to radiation which is received directly from the emitting element and to radiation which is emitted by the emitting element and reflected toward the detector by the reflecting element.