Apparatus emitting an electromagnetic radiation

摘要

This invention relates to an apparatus emitting electromagnetic radiation, particularly infrared, which comprises a cylindrical source of rays and a reflector. In order to avoid the problem due to captive rays and to multiple reflections, the cross section of a half-reflector comprises, starting from the plane of symmetry, a first curved part constituted by an arc of involute to a circle extending from the plane of symmetry to an end located on a first extreme ray tangential to the source and passing through a first end of the target and a second curved part joined tangentially to the first curved part and of such shape that all the tangential rays emitted from the cylindrical source and falling on this second curved part are reflected towards the first end of the target located on the other side of the plane of symmetry.