HIGH RECYCLING EFFICIENCY SOLID STATE LIGHT SOURCE DEVICE

摘要

A light source device includes a LED light source or a wavelength conversion material having a near Lambertian light emitting surface. The light source device includes a light recycling system to reflect small-angle lights (lights closer to the normal direction of the light emitting surface) back to the light source, and a collection system for collecting and outputting large-angle lights (lights farther away from the normal direction). The lights reflected by the light recycling system is scattered by the emitting surface in all directions, where the large-angle scattered lights are collected by the light collection system and the small-angle scattered light is reflected by the light recycling system again. A second excitation light source without wavelength conversion material or a second light source with its own wavelength conversion material may be provided, and the second light is directed to the light emitting surface by appropriate optical components.

主权项

1. A light source device comprising:
a first light source having a light emitting surface which emits lights and/or scatters lights into a range of directions including small-angle lights and large-angle lights, the small-angle lights having smaller angles with respect to a normal direction of the light emitting surface than the large-angle lights; a light recycling system, including at least one reflector disposed on one side of the first light source, for directing the small-angle lights back to the first light source; and a light collection system for collecting and outputting the large-angle lights, wherein the light recycling system and the light collection system are separate from each other.