Lighting assembly with adjustable light output

摘要

A lighting assembly includes a light guide having opposed major surfaces between which light propagates by total internal reflection, a light input edge, and two light output regions of different optical characteristics and at least one of which is associated with a corresponding one of the major surfaces. The lighting assembly also includes a light source located adjacent the light input edge. The light source and the light guide variably positionable relative to one another to vary a location on the light input edge at which the light is input to the light guide such that the light is emitted from the light guide selectively apportioned between the light output regions so that a characteristic of the light output from the lighting assembly is modified based on the optical characteristics associated with the light output regions and the relative positioning of the light source and the light guide.

主权项

1. A lighting assembly, comprising:
a light guide comprising a solid and light transmissive medium having:
opposed major surfaces between which light propagates by total internal reflection,a light input edge that extends in a thickness direction between the opposed major surfaces, the light input edge having a surface area through which the light is received into the light guide, andtwo light output regions associated with one of the major surfaces, each of the light output regions defined by light extracting elements at at least one of the major surfaces of the light guide, the light extracting elements disrupting the total internal reflection of the propagating light in the light guide to output the light from the light guide via the respective light output region; an optical adjuster comprising a major surface juxtaposed with and conforming to the one of the major surfaces of the light guide, the optical adjuster having optical adjuster regions respectively aligned with the light output regions of the light guide, each optical adjuster region being associated with a different optical characteristic; and a light source located adjacent the light input edge to input light into the light guide, the light source and the light guide variably positionable relative to one another to vary a location on the light input edge at which the light is input to the light guide such that the light emitted from the light guide is selectively apportioned between the light output regions and the optical adjuster regions so that a characteristic of the light output from the lighting assembly is modified based on the optical characteristics associated with the optical adjuster regions and the relative positioning of the light source and the light guide.