| 摘要 |
The invention relates to a signaling or display device with a matrixed light field, comprising a housing, a light source matrix that can be controlled individually, in groups or as a whole, especially LED (14), which is arranged on a printed circuit board (10) and a lens system with spatially defined light intensity distribution. Said lens system has at least one dispersing lens (12) which is flat on the outside and which extends along the entire luminous field. Grooves (18) running parallel on the inner side with at least partially asymmetrical curved surfaces (26) are arranged on said lens. The planar area (b) between the grooves (18) runs parallel or slightly tilted in relation to the outer flat surface (22). A method for monitoring the intensity of light of an optical signaling or display device with a matrixed light field is controlled by sensors arranged on the back of a printed circuit board (10). Said sensors detect the light rays (16') emitted backwards by the light sources (14) arranged on the at least partially transparent printed circuit board (10) and/or the light rays (16") reflected by the intermediate field lens (30) or on the dispersing lens (12), in case the former is not available, and penetrating the printed circuit board (10) and converts them into signals. The signals are guided to an electronic device, which triggers an increased electrical current, a warning and/or disconnection when a defined threshold value is not met. |
