PRISMATIC TOROIDAL LENS AND TRAFFIC SIGNAL LIGHT USING THIS LENS
A traffic signal light (10) comprises an array (11) of light-emitting diodes (12) for producing respective light rays, and an array (21) of lenses (22) for propagating light rays from the light-emitting diodes (12) toward a plurality of predetermined, distinct spatial points. The lenses (22) are each associated with a corresponding one of the light-emitting diodes (12), and each lens (22) comprises a solid body of light-propagating material defining a light-refracting surface (26) through which the light rays from the corresponding light-emitting diode (12) propagate. The light-refracting surface (26) is divided into distinct light-refracting surface (26) sections each associated to a corresponding one of the spatial points. The light-refracting surface (26) sections have diffferent configurations in view of deviating the light rays propagating therethrough toward the associated spatial points, respectively. Therefore, at each spatial point add the light rays deviated by the associated light-refracting surface sections of the different lenses.