LIGHT DISTRIBUTION SYSTEM FOR OPTICAL ENCODERS

摘要

The invention provides a light distribution system for optical encoders including a light guide plate (28) and a light input coupler [Figs. 1-5 (87); Fig. 6 (90); Fig. 7 (89)] for distributing input incident radiations into the light guide plate as a flat distributed beam of beam segments (114) intercepted by a pattern of discrete light output couplers [Figs. 3, 4 (50-54)] reflecting narrow output beams [Figs. 5, 8 (30)] for providing a uniform pattern of encoding illuminations.