| 摘要 |
A retroreflective vision control panel which includes an opaque sheet material coated with retroreflective light reflecting particles and a dark opaque color on the reverse side thereof, and an image formed over top the retroreflective particles using colored light permeable translucent inks or films to form an image thereon. The opaque sheet and image have a plurality of perforations spaced therethrough. Translucent light-permeable sheet material is provided on the back side of the panel and overlaid on one or the other side with translucent inks to form a second image. An observer on the front side of the panel will observe one or the other of the images, depending upon the relative intensity of the light incident on the front and back sides of the panel.
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