Optical Dispersion Plate
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
A plate, for the collection of diffusely scattered overhead light for focusing on photodiodes in an array and for transforming the light pattern of an array of light-emitting diodes (LEDs) into a beam pattern, is injection molded of transparent plastic with the optical elements disposed in a circular configuration. The LEDs are positioned around the periphery, and the photodiodes are positioned centrally shielded by a stray light protection member. Fig. 1 shows the plan and elevation view of the optical dispersion plate for incremental angular positioning. Fig. 2 shows the plan and elevation view of the optical dispersion plate for continuous angular positioning. Fig. 3 shows details of the transmitter prism/lens assembly with dimensions in millimeters.