| 摘要 |
<p>A highway sign (10) includes a reflective back surface (20) and a biased lenticular lens (18) front surface for reflecting light (22) back in the direction of the original light source (16). The reflective back surface (20) preferably comprises a plurality of corner cubic reflectors (20a, 20b, 20c, 20d) arranged in a regular matrix. The biased lenticular lens (18) front surface comprises arcuate surfaces (18a, 18c), or flat surfaces (117a) having arcuate indentations (117b, 118, 119, 120, 121), separated by relatively flat surfaces (18b) which are substantially perpendicular to the plane of the reflective surface (20) and which form a saw-toothed pattern when seen in profile. Printing can be applied to the lens surface to form traffic control messages or indicia (11). The biased lenticular (18) front surface diffuses the oncoming light, thus providing a uniform reflective surface. The reflective surface (20) and biased lenticular lens system (18) can be formed from a single integrated sheet of polycarbonate plastic or similar material. The sign (10) is relatively inexpensive to manufacture, substantially waterproof and effective in reflecting light back in the direction of an oncoming automobile.</p> |
