| 摘要 |
This invention relates to a light redirecting article that redirects light toward a target angle, the light redirecting article having an input surface for accepting incident illumination over a first range of incident angles when in a first position and over a second range of incident angles when in a second position: the output surface having a number of light redirecting structures, each having a first exit surface sloping away from normal in one direction as defined by a first base angle F1, wherein the first exit surface redirects illumination with the light redirecting article in the first position, and a second exit surface sloping away from normal, in the opposite direction relative to the first exit surface, wherein the second exit surface redirects illumination with the light redirecting article in the second position and wherein first and second base angles F1 and F2 are unequal.
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