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Identification card with embedded halftone image security feature perceptible in transmitted light

  • US 20050035589A1
  • Filed: 06/16/2004
  • Published: 02/17/2005
  • Est. Priority Date: 06/23/1999
  • Status: Active Grant
First Claim
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1. An information-bearing assembly comprising:

  • a first layer, the first layer having an imagewise halftone pattern of microholes formed therein, each microhole penetrating at least partially through the thickness of the first layer such that the light transmissivity of the first layer within said half-tone pattern is imagewise differentiated at each microhole; and

    a second layer coupled to the first layer, the second layer covering the imagewise half tone pattern of microholes in a manner that permits transmitted light to reach the microholes;

    wherein the microholes have sufficiently small structural dimensions such that, under unassisted visual inspection, the imagewise halftone pattern is (a) substantially imperceptible when the information-bearing assembly is viewed in reflection, and (b) substantially perceptible when the information-bearing assembly is viewed in transmission.

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