Optical device and luminaire

Abstract

Disclosed is an optical device () comprising a plurality of lenses () for projecting a plurality of parallel beams () having a predetermined width towards an object area, wherein each lens comprises a lens body including a cavity () for housing a solid state lighting element (); a pair of opposing internally reflecting side surfaces () for constraining said beam within said predetermined width; and a light exit surface delimited by said opposing side surfaces, the light exit surface comprising a curved region () extending from a first further side surface () extending between the opposing side surfaces and shaped to generate a collimated beam portion along an optical axis; and a stepped region in between the curved region and a second further side surface () extending between the reflecting side surfaces, wherein said steps are defined by a plurality of prismatic protrusions (), each of said protrusions laterally extending between said opposing side surfaces. A luminaire including at least one such an optical device is also disclosed.