TOTAL INTERNAL REFLECTION LENS WITH STEP-SHAPED FRONT SURFACE AND CENTRAL CONVEX REGION
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United States of America Patent
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Apr 21, 2015
filing date -
Apr 21, 2015
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Abstract
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.
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