Patent ID: 6161945
Filing Date: 2000-12-19
Classification: F21V,F21W

Abstract:
A light beam projector device, comprisinga light source and reflector means arranged to direct the light originating from the light source in such a manner as to form a light beam, said reflector means comprising a curved concave reflecting surface having a geometrical focus where the light source is positioned,at least a first tubular wall made of a material able to filter color from the light, and arranged when set in an active position, to laterally embrace the light source so as to be traversed by the light before it reaches the reflecting means, said tubular wall being arranged with its axis substantially coinciding with the axis of the reflecting means,actuator means for axially moving said tubular wall into said active position or to an inactive position below the reflecting means where it does not interfere with the radiation emitted by the light source and directed towards the reflecting means and to intermediate positions in which only a part of the tubular wall is traversed by the light, anda second tubular wall or tubular wall segment positioned coaxially with the first tubular wall and arranged, when in its active position, to laterally embrace the light source so as to intercept the radiation emitted by the light source, the second tubular wall or wall segment being made of a transparent material with its surface suitably treated physically to diffuse the radiation before it reaches the reflecting surface.