| 摘要 |
This disclosure provides systems, methods and apparatus for illumination. In one aspect, a lampshade includes a light source coupled to a tapered light guide sheet. The light guide sheet extends laterally and is curved around a vertical axis. The light source injects light into the wide end of the tapered light guide sheet and the tapered sidewalls of the light guide sheet allow the light to escape out of the light guide sheet and in the general direction of the narrow end of the tapered light guide sheet, thereby allowing the lampshade to act as an up-light or down-light, depending on the direction that the narrow end is pointing. The lampshade may include light extracting and turning features and/or a reflector configured to eject light laterally outward from the light guide sheet, thereby allowing the lampshade to illuminate objects on the same plane as the lampshade.
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