Magnetically orientable retroreflectorization particles

Details Magnetically orientable retroreflectorization particles Magnetically orientable retroreflectorization particles

1976-08-03

1977-10-25

Corbin, John K.

350 97, 350103, G02B 5128

Patent

active

040553779

ABSTRACT:
Novel magnetically orientable retroreflectorization particles permit application of highly oriented retroreflective coatings. The retroreflectorization particles individually comprise at least one transparent microsphere, specular reflective means in optical connection with a first portion of said microsphere so as to provide retroreflection of light incident on the opposed portion of the microsphere, and a magnetic layer underlying said specular reflective means and having a magnetic axis parallel to the optical axis on which said first and opposed portions of the microsphere are aligned. When the particles are applied to a substrate in the presence of a magnetic field having flux lines of appropriate polarity perpendicular to the substrate, the particles tend to become aligned in a common direction that retroreflects light incident on the coating.

REFERENCES:
patent: 3347614 (1967-10-01), Fuller et al.
patent: 3420597 (1969-01-01), Nellesen et al.
patent: 3508215 (1970-04-01), Cohler et al.
patent: 3545843 (1970-12-01), Somers et al.
patent: 3700305 (1972-10-01), Bingham
patent: 3758192 (1973-09-01), Bingham

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