| 摘要 |
ILLUMINATING DEVICE HAVING NON-ABSORPTIVE VARIABLE TRANSMISSIVITY COVER An illuminating device with a light source and a substantially non light absorptive cover. The light transmissivity of the cover at any point on the cover varies as a function of the position of that point, such that the luminance of light escaping through the cover at that point has a selected luminous exitance as a function of the position of that point. |
