Stock material or miscellaneous articles – Composite – Of bituminous or tarry residue
Patent
1988-07-26
1990-01-23
Arnold, Bruce Y.
Stock material or miscellaneous articles
Composite
Of bituminous or tarry residue
350102, 428161, G02B 5124
Patent
active
048954284
ABSTRACT:
The present invention provides a retroreflective material which has improved retroreflectivity at high angles of incidence. The retroreflective material comprises a transparent surface layer and an array of reflecting elements, each of the reflecting elements including a rectangular base having a length L, two tetragonal faces nearly perpendicular to each other and having a line of intersection of length Y, the length Y being less than said length L, a triangular face nearly perpendicular to the tetragonal faces; and a non-perpendicular triangular face forming an angle alpha with the plane perpendicular to the base, the angle alpha being preferably about sin.sup.-1 (0.25
) to sin.sup.-1 (l
), and more preferably about sin.sup.-1 (0.35
) to sin.sup.-1 (0.9
), where n is the refractive index of the reflecting elements, the perpendicular triangular face and the tetragonal face defining an approximate cube corner therebetween and the non-perpendicular triangular face and the tetragonal faces forming a non-orthogonal corner therebetween, the reflecting elements arranged with their base adjacent the surface layer.
REFERENCES:
patent: 3458245 (1969-07-01), Stanley
patent: 3712706 (1973-01-01), Stamm
patent: 3833285 (1974-09-01), Heenan
patent: 3873184 (1975-03-01), Heenan
patent: 3923378 (1975-12-01), Heenan
patent: 4066236 (1978-01-01), Lindner
patent: 4189209 (1980-02-01), Heasley
patent: 4208090 (1980-06-01), Heenan
patent: 4349598 (1982-09-01), White
Eckhardt, H. D., "Simple Model of Corner Reflector Phenomena", Applied Optics, pp. 1559-1566, vol. 10, No. 7, Jul., 1971.
Cobb, Jr. Sanford
Nelson John C.
Arnold Bruce Y.
Ben Loha
Jordan Robert H.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
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