| 摘要 |
In combination with an inkjet printer having a glossy topcoat deposition feature, a method for printing security marks on an inkjet-printed sheet which includes the step of modulating the deposition of the topcoat layer, rather applying it uniformly to the imaged surface of the sheet. Modulated deposition results in variations in gloss which are visible when the document is viewed at an angle. Three alternatives for modulation are possible: the topcoat layer may be applied to the entire sheet, but with the amount thereof deposited per unit area over the surface of the document alternating between a low value and a high value; the topcoat layer may be applied to the entire sheet, but with the amount thereof deposited per unit area varying over the surface of the document as a continuous function between a low value and a high value; or the topcoat layer may be applied to only portions of the document surface. Modulated application of the topcoat can be controlled using one of several available techniques; the standard print driver can be employed in a manner similar to that used for the printing of standard images with pigmented inks; the printer may be designed to accept a custom plug-in module procurable from a secure source (e.g., the printer manufacturer) which, when enabled by the standard print driver, controls the printing of a particular security mark design; or an internet-based vendor may provide a secure downloadable security mark design in much the same manner that printable postage stamps are provided through various vendors in conjunction with the U.S. Postal Service's Information Based Indicia Program.
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