×

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

  • US 7,086,666 B2
  • Filed: 06/16/2004
  • Issued: 08/08/2006
  • Est. Priority Date: 06/23/1999
  • Status: Expired due to Term
First Claim
Patent Images

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 a thickness of the first layer such that 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 second layer comprises a material that is substantially optically clear in the visible spectrum;

    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.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×