FIELD: physics.
SUBSTANCE: light-emitting diode (LED) emits light towards a central light-emitting lens having a curved surface which, through total internal reflection, reflects light from the LED outwards approximately parallel to the top surface of the LED chip. The central lens has a height of 2 mm, which is required to reflect light from the LED outwards. A lower bundle of waveguides, having a height of 1 mm, continues radially from the periphery of lower half of the central lens, and an upper bundle of waveguides, having a height of 1 mm, continues radially from the periphery of the upper half of the central lens. Output light regions of the upper and lower bundles of waveguides are parallel to each other such that lateral radiation with height of 2 mm falls to 1 mm height lateral radiation without reducing the light emission region.
EFFECT: reduced waveguide thickness.
15 cl, 13 dwg
