Directionally imaged retroreflective sheeting

Details Directionally imaged retroreflective sheeting Directionally imaged retroreflective sheeting

1984-08-03

1987-03-17

Corbin, John K.

G02B 5128

Patent

active

046502831

ABSTRACT:
Retroreflective sheeting of the prior art comprises a monolayer of transparent glass microspheres partially embedded in a binder layer and a specularly reflective layer covering the back surfaces of the microspheres. In the prior art, a laser beam directed at an angle to the face of the sheeting forms an image in such sheeting which is directional in that it can be viewed only from that angle. In the invention, such a directional image is provided by tiny ellipsoidal cavities, each opening through a back surface of the microsphere.

REFERENCES:
patent: 3154872 (1964-11-01), Nordgren
patent: 3190178 (1965-06-01), McKenzie
patent: 3801183 (1974-04-01), Sevelin et al.
patent: 4082426 (1978-04-01), Brown
patent: 4099838 (1978-07-01), Cook et al.
patent: 4200875 (1980-04-01), Galanos

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