Patent ID: 7588361
Filing Date: 2009-09-15
Classification: G02B

Abstract:
1. An illumination comprising at least one plain or slightly curved, solid light guide made of transparent material, said at least one solid light guide receiving light from a light source, said at least one solid light guide being provided with a light extraction surface through which light emerges from the light guide, and means for extracting light from said one solid light guide through the light extraction surface, wherein the means for extracting light from said one solid light guide has reflecting surfaces with slopes, the slope of each reflecting surface being different from the slopes of the other reflecting surfaces, the slopes being varied as a function of the position of the extracting means in the light guide as well as the position of a reading plane, so as to direct the light flux to a desired reading plane position, said reading plane being a restricted area with respect to the light extraction surface.