Method of increasing retroreflective brightness in a retroreflec

Details Method of increasing retroreflective brightness in a retroreflec Method of increasing retroreflective brightness in a retroreflec

1995-01-06

1996-01-16

Phan, James

Optical: systems and elements

Signal reflector

3-corner retroreflective

359900, 264 19, G02B 5124

Patent

active

054853117

ABSTRACT:
A method of increasing retroreflective brightness in a retroreflective sheet material. The retroreflective sheet material has a multitude of prism-like reflective elements imbedded in a transparent polymer plastic top film and glued by a grid of adhesive to a backing sheet. The method includes the step of heating the retroreflective sheet material until bubbles form in the transparent polymer plastic top film containing the prism-like reflective elements. The bubbles are confined by the grid. The bubbles serve as miniature magnifying lenses which increase retroreflective brightness and increase the exposure area thereby providing a wider observation angle.

REFERENCES:
patent: 4938563 (1990-07-01), Nelson et al.
patent: 5171624 (1992-12-01), Walter

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