专利名称：Retroreflection sheeting and film for use in
retroreflection sheeting
发明人：Keishi Koizumi,Kazushi Nakatani申请号：US10583342申请日：20041214
公开号：US20070159696A1公开日：20070712
专利附图：
摘要：An object of the present invention is to provide a retroreflective sheeting thatexhibits proper retroreflection even at a small incident angle with no or less halation, andhas superior incident angularities and superior direction characteristics, as well as a film
for use in the retroreflective sheeting. The retroreflective sheeting with the abovecharacteristics is obtained by forming reflective elements of a specific triangularpyramidal frustum configuration in a close-packed state on one surface thereof. Theshape of the triangular pyramid frustum element satisfies following requirements: oneside length of the bottom surface is in the range of 50 to 400 μm, and a differencebetween a longest side and a shortest side is 200 μm or less; the length of a longestedge is in the range of 50 to 400 μm, and a difference between the longest edge and ashortest edge among the three edges is 100 μm or less; when a vertical line whichintersects perpendicularly with the bottom surface is drawn from a top surface to thebottom surface, the length of a longest vertical line is in the range of 20 to 250 μm; andan angle between adjacent side surfaces is in the range of 85 to 95 degrees.
申请人：Keishi Koizumi,Kazushi Nakatani
地址：Osaka JP,Osaka JP
国籍：JP,JP
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