| 摘要 |
<p>An illuminated sign system is disclosed that provides uniform illumination over the lamp face by using partially transmissive lamp masks located between the lamps and the sign face. The sign face itself also diffusely reflects at least a majority of light incident on its second surface back towards the interior of the sign. The combination of a diffusely reflective lamp face and partially transmissive lamp masks enhances uniformity of the sign face illumination. The lamp spacing ratio in the illuminated signs can be increased, e.g., to a ratio of 3:1 or more, and, possibly, to a ratio of 4:1 or more.</p> |
