Signal generator of e.g. LED light signals used in road traffic sector, has optical waveguide element for mixing color components of different colored LEDs, having curved area with a portion comprised of longitudinally extending groove

摘要

The signal generator (1) comprises an optical waveguide element (6). The optical waveguide element mixes the color components of the different colored LEDs (3), in which the optical waveguide element comprises a curved area, where a portion of the curved area is comprised of a longitudinally extending groove. The optical waveguide element is formed in S-shape and has a convexly curved outer surface having mutually parallel grooves.