Patent ID: 8011800

Claim:
A device for producing isotropic ambient light, characterised in that it includes at least one extended light source, which comprises several punctual light sources spaced apart along two orthogonal axes, a wave guide, which enables light beams produced by the punctual light sources to be propagated, by total reflections and in a propagation direction perpendicular to a plane, and a means for scattering the light at an exit of the wave guide, and in that a dimension of the wave guide along said propagation direction is sufficient for a light intensity curve which is detected for each light source at the exit of the wave guide along one of the two axes and in a detection range corresponding to a section of the exit of the wave guide along said one of the two axes, to display a maximum value (Imax) and a minimum value (Imin), with respect to the following criterion of quasi-uniformity: (Imax-Imoy) ≦0.3 Imoy and (Imoy-Imin) ≦0.3 Imoy, Imoy being an average value of the light intensity levels detected along said one of the two axes.