Double freeform-surface lens with uniform color temperature

摘要

The present invention provides a double freeform-surface lens with uniform color temperature including an incident free surface, an emergent freeform-surface and a side connecting face. The side connecting face is a side wall connecting the incident freeform-surface and the emergent freeform-surface. Aiming at impacts of using the single lens on color temperature upon LED light distribution, the double freeform-surface lens is designed, which is fabricated from a transparent optical material. The transparent material is PC or PMMA or optical glass. The double freeform-surface lens is capable of controlling a light distribution angle, and light spots obtained have uniform color temperature.