Retroreflective microprismatic material and method of making...

Details Retroreflective microprismatic material and method of making... Retroreflective microprismatic material and method of making...

G - Physics

02

B

88/113.18

G02B 5/124 (2006.01) E01F 9/015 (2006.01) B29C 65/08 (2006.01)

Patent

CA 2040909

A microprism retroreflector material has a body portion with a planar front face and closely spaced microprisms extending thereacross in a plane spaced from and parallel to the front face. The microprisms are formed with three side surfaces disposed along three intersecting planes, and at least some of the microprisms have at least one side surface which is arcuate along one of the intersecting planes and over at least the major portion of its height. At least some adjacent pairs of microprisms have their prism axes tilted relative to the intersecting plane extending therebetween. The microprisms retroreflect light in six circumferentially spaced radially extending exit-energy patterns, and at least 70 per cent of the retroreflected light is within a spread of not more than 0.6° from the light rays impinging thereon.

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