Retroreflective microprismatic material and method of making sam

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

1990-06-01

1992-12-15

Loney, Donald J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

428161, 428167, 428172, 428212, 428913, 359530, 359534, 359535, 359537, 359542, 359546, 359584, B32B 500, G02B 5122

Patent

active

051716240

ABSTRACT:
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 percent of the retroreflected light is within a spread of not more than 0.6.degree. from the light rays impinging thereon.

REFERENCES:
patent: 1671086 (1928-05-01), Stimson
patent: 1743834 (1930-01-01), Stimson
patent: 1743835 (1930-01-01), Stimson
patent: 3541606 (1970-11-01), Heenan et al.
patent: 3689346 (1972-09-01), Rowland
patent: 3923378 (1975-12-01), Heenan
patent: 4066331 (1978-01-01), Lindner
patent: 4349598 (1982-09-01), White
patent: 4588258 (1986-05-01), Hoopman
patent: 4775219 (1988-10-01), Appeldorn et al.
patent: 4938563 (1990-07-01), Nelson et al.

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