Light diffuser and lamp incorporating the same

摘要

A lamp includes a light source having a center and a light diffuser disc having two opposite faces and supported at a distance from the light source. One face of the light diffuser disc is provided with a prism structure which is symmetrical with respect to a normal that passes through the center of the light source and that is perpendicular to the faces of the light diffuser disc. The prism structure is formed of a plurality of prisms extending parallel to one another; each prism has a frontal flank oriented towards the normal and a rear flank oriented away from the normal. The angle of inclination of the frontal flanks gradually decreases from prism to prism in a direction away from the normal, while the angle of inclination of the rear flanks gradually increases at a decreasing rate, from prism to prism towards an upper limit value in a direction away from the normal.