TOTAL INTERNAL REFLECTION LENS WITH STEP-SHAPED FRONT SURFACE AND CENTRAL CONVEX REGION

摘要

A total internal reflection (TIR) lens can have a back surface tapered to provide total internal reflection of light toward the front surface. The front surface can have a stepped shape defining a cavity that extends into the lens body, with a width of the cavity increasing toward a front side of the lens. The front surface can further have a convex central surface segment that extends from the front surface within a central portion of the cavity. A peripheral cover member can be formed integrally with the lens body, with a front surface extending laterally outward from an outer edge of the front surface of the lens body and a back surface extending laterally outward from an outer edge of the back surface of the lens body.

主权项

1. A lens comprising:
a lens body having a back surface and a front surface, the back surface having a tapered shape symmetric about an optical axis to provide total internal reflection to direct light from a light source position near a central portion of the back surface toward the front surface, the front surface having a stepped shape symmetric about the optical axis, the stepped shape defining a cavity that extends into the lens body, wherein a width of the cavity increases toward a front side of the lens, the front surface further having a convex central surface segment extending from the front surface within a central portion of the cavity.