| 摘要 |
Both a metallized cube corner retroreflective sheeting having a high measured daytime luminance factor and a method of manufacture thereof are provided. The sheeting is formed from a transparent planar sheet material including on one side a dense array of retroreflective cube corners having height H. The cube corners are canted edge-more-parallel by within about 1.5 degrees of 10n-9 degrees, where n is the index of refraction within the cube corners, and the cube corner faces are metallized by the application of a thin coating of reflective metal. The thickness of the sheet material between the bases of the cube corners and the opposite side of the sheeting is preferably between 1.75 H and 4.00 H. The resulting metallized, retroreflective sheet material may be mounted on a vehicle to increase its nighttime visibility through the ability of the sheet material to efficiently retroreflect a beam of light from a headlight or other source across a broad range of incident and orientation angles. Advantageously, the sheeting also reflects at least about 3.5% of normal and near normal light at angles within 5
of 45
obliquity, advantageously giving it a high measured daytime luminance factor as required by transportation regulations. |
