Document having identifying surface cavities

Details Document having identifying surface cavities Document having identifying surface cavities

B - Operations, Transporting

42

D

B42D 15/00 (2006.01) B32B 3/24 (2006.01) B32B 27/10 (2006.01) B32B 27/36 (2006.01) G07D 7/00 (2006.01)

Patent

CA 2325316

A security structure is defined for providing a measure of security against counterfeiting of valuable documents and for conveying information tactilely to a user. In one embodiment, the security structure is a laminate that includes a base layer and two outer layers bonded to opposite faces of the base layer. Each outer layer includes a plurality of apertures arranged in a preselected pattern. Each aperture, in conjunction with the portion of the base layer adjacent that aperture, defines a cavity. Each cavity and/or pattern of cavities are configured to convey information to a user through the user's sense of touch. A method of forming the laminate is also disclosed. The method includes bonding the two outer layers to the base layer and forming the apertures in the two sheets using a laser drill.

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