SECURE IDENTIFICATION DOCUMENTS

This application is being filed as a PCT International Patent application in the name of DataCard Corporation, a U.S. national corporation.

Field

The invention relates to identification documents, for example identity cards, credit cards and the like, and passports, that contain an image of the intended document holder.

Background

It is known to produce identity cards with an image of the intended card holder. The image allows visual identification of the card holder. Even with a protective overcoat over the image, it is possible to remove the photo pigments that form the image using a combination of chemicals and acute abrasives. The removed image can then be substituted with a new image and the card used fraudulently. Efforts have been devised to prevent tampering of the image on an identity card. For example, see U.S. Patent Nos. 5,350,198; 5,435,599; 5,774,168; 6,633,321; and 6,867,167 (EP 1 187 727).

However, continued improvements are necessary to prevent tampering of images on identification documents.

Summary This disclosure relates to improvements that prevent tampering of images on identification documents for example identity cards, credit cards and the like, and passports.

In one embodiment, an identification document includes a foil color image of a person. A second, foil, achromatic image of the person is formed underneath and spaced from the color image and in congruence therewith using a laser.

The second foil image is not visible underneath the first foil image during normal viewing of the document, and is only visible upon removal of all or a portion of the first foil image. As a result, the document and the image have no outwardly apparent visual difference to the document holder or to a would-be counterfeiter. This provides a covert security feature that is not known or seen until the document is attacked by removing the first foil image. Once attacked, and the second foil image discovered to be non-removable, the document is then already damaged to such a point to be unusable (either validly or fraudulently).

In a method of forming an identification document containing a first, full, color printed image of a person, the method is characterized by forming a second, fall, achromatic image of the person underneath and spaced from the first foil image and in congruence therewith using a laser. In a preferred embodiment, the second, foil image is formed after the first, foil image is formed.

The first and second images can be applied in a single personalization system that includes both color printing capability and laser engraving capability in an inline process. The system can be either single pass or multipass. The same image file can be used for forming the first foil image and the second foil image. As a result, no software adjustments need to be made, and the data processing and handling is simplified.

Drawings Figure 1 is a diagrammatic sectional view of an identification document, in particular an identity card, according to the invention.

Figure 2A depicts a first, foil, color printed image that can be formed on the card. Although the image is shown in black and white in the figure, it would be in color on an actual card.

Figure 2B depicts a second, full, achromatic image that can be formed on the card.

Figure 2C is an approximation of a resulting image with the second, full image of Figure 2B disposed underneath, spaced from, and congruent with the first, full image of Figure 2A.

Detailed Description

The description describes improvements to identification documents having images of the intended holders of the identification documents. The improvements help prevent tampering of the images, thereby deterring fraudulent use of the identification documents. The identification documents to which the improvements apply include, for example, identity cards, financial (e.g. credit and debit) cards, driver's licenses, passports, and other identification documents that bear images of the intended document holders. For sake of convenience, the invention will be described in detail below with respect to an identity card.

Referring to Figure 1, an identity card 10 is shown as including a substrate 12, a printing layer 14 and a protective overlay 16. The substrate 12 can be made of a material commonly used to form identity cards, for example plastics such as polyvinyl chloride (PVC), polyester terephthalate modified with glycol (PETG), polycarbonate, or a composite material. The material of the substrate 12 must be receptive to laser engraving which is a known process that permanently alters the substrate 12 by projecting a laser beam onto the surface of the substrate 12. Laser engraving is disclosed in U.S. Patent 5,350,198; 5,774,168; and 6,633,321.

The printing layer 14 is a layer that is receptive to the various color printing technologies used for identity cards. Suitable printing technologies include dye diffusion thermal transfer (D2T2), dye diffusion retransfer, pigment retransfer, and less commonly inkjet. The specific material of the printing layer 14 is known to persons having ordinary skill in the art.

The protective overlay 16 is a layer that protects the card against abrasion, chemicals and moisture. An example of a suitable overlay 16 is

DURAGARD ^® clear laminate available from DataCard Group of Minnetonka, Minnesota, United States. The overlay 16 could also be a holographic or other security featured foil laminate known in the art.

With reference to Figures 1 and 2A-C, first and second full images 20 and 22, respectively, of the intended card holder are formed on the card 10. A full or complete image is one where the entire image of at least the face of the card holder is reproduced on the card, rather than select portions of the image, whereby the card holder can be visually identified by either image. If desired, the two images 20, 22 can each include a soft/faded/blurred border on the respective image to aid in disguising any small misalignment between the two images 20, 22.

The first full image 20 is a complete image that is color printed on the printing layer 14. Preferably, the image 20 is formed by dye diffusion or pigment based printing (either direct or retransfer technology), which are well known in the art. Figure 2A illustrates the first full image (it being understood that the image 20 is shown in Figure 2A as being achromatic but would be in color on an actual card 10). In the case of a passport, retransfer technology would preferably be used to apply the image 20 to a plastic data page within the passport.

The ^" second full image 22 is formed on the substrate 12 underneath the first full image 20 and in congruence therewith. The second full image 22 is formed by projecting a laser beam from a laser mechanism onto the surface of the substrate 12 which permanently alters the surface of the substrate 12 with an achromatic version of the image of the intended card holder, as shown in Figure 2B. The image 22 is applied with the laser set at an opacity level (i.e. gamma/brightness/contrast) so that the image 22 does not significantly affect the resulting aesthetics of the first image 20 above it. For example, the image 22 can be lasered with 50% opacity settings. The resulting image 22 is a gray scale image.

Figure 2C illustrates the resulting image 24 with the second, full image of Figure 2B disposed underneath, spaced from, and congruent with the first, full image of Figure 2 A. If desired, the soft/faded/blurred borders discussed above can be used. The second image 22 has minimal or no impact on the aesthetics of the first image 20,

so that the resulting image 24 appears to be essentially the image 20. Further, the second image 22 is not visible underneath the first image 20 during normal viewing of the document, and is only visible upon removal of all or a portion of the first image 20. Thus, the second image 22 forms a covert security feature that is not known or seen until the document is attacked in an attempt to remove the first image 20. Once the first image 20 is attacked, and the second image 22 discovered to be non-removable, the card is then already damaged to such a point to be unusable (either validly or fraudulently).

Preferably, the image 22 is formed on the card 10 after the first image 20 is printed. The images 20, 22 can be applied in a single personalization system that includes both color printing technology and laser engraving technology in an inline (single pass or multipass) process. Preferably, the same image file is used for forming the first image 20 and the second image 22. As a result, no software adjustments need to be made, and the data processing and handling is simplified.

The concepts described herein could be used on other color information or data on identification documents, such as color logos. In addition, the concepts herein could be used on non-color information or data on identification documents, where lasered information is formed underneath and spaced from printed data and in congruence therewith.