Transparent sheets containing directional images and method...

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

G - Physics

02

B

327/1.1, 352/32.

G02B 5/128 (2006.01) G06K 19/14 (2006.01)

Patent

CA 1250952

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.

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