ILLUMINATOR COMPRISING BICONVEX LENS WITH TIR TEETH

Abstract: a lens comprises a first surface and a second surface opposite the first surface. the first surface includes a first convex central refractive portion and a total internal reflection (tir) portion peripheral to the first convex central portion. the second surface includes a second convex central refractive portion and a peripheral refractive portion having a curvature different from a curvature of the second convex central refractive portion. the first convex central refractive portion and the second convex central refractive portion are shaped to collimate or partially collimate light via refraction at the first convex central portion followed by refraction at the second convex central portion. the tir portion and the peripheral refractive portion are shaped to collimate or partially collimate light by total internal reflection at the tir portion followed by refraction at the peripheral refractive portion.

Inventor(s): Arjen Gerben van der Sijde, Nicola Bettina Pfeffer

CPC Classification: F21V5/045 ({the lens having discontinuous faces, e.g. Fresnel lenses})

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