OPTICAL DEVICE, LENS, LIGHTING DEVICE, SYSTEM AND METHOD

摘要

An optical device comprising a first surface with a plurality of micro sized facets, each facet having a respective orientation. Said plurality of facets having an optical axis which extends parallel to the normal vector to an average orientation of all said respective orientations. The plurality of micro-sized facets comprises a meaningful pattern forming sub-set of facets. Said sub-set has at least one feature chosen from: equal orientation (tilt and azimuth), similar color, similar marking(scratching, frosting, ribbing), similar spacing with adjacent facets.