Transparent sheets containing directional images and method for

Details Transparent sheets containing directional images and method for Transparent sheets containing directional images and method for

1985-05-13

1987-09-08

Corbin, John K.

G02B 5128

Patent

active

046919937

ABSTRACT:
A directional image is created in transparent sheeting comprising a monolayer of microlenses by forming deformations in at least some of the microlenses by irradiation with a laser beam which has a short pulse duration. The directional images may be formed in transparent sheeting which has been applied to a document as an overlay. When viewed under diffuse lighting conditions, the deformations appear as a dark image. The deformations may be formed so that when viewed under retroreflective conditions within a conical field the image is darker than the surrounding background, and when viewed under retroreflective conditions outside the conical field the image is brighter than the surrounding background.

REFERENCES:
patent: 3154872 (1964-11-01), Nordgren
patent: 3503315 (1970-03-01), de Montebello
patent: 3801183 (1974-04-01), Seveliu 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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