Laser imaged identification card

• US 5,421,619 A
• Filed: 12/22/1993
• Issued: 06/06/1995
• Est. Priority Date: 12/22/1993
• Status: Expired due to Term

• Current Assignee: Assa Abloy AB
• Original Assignee: Drexler Technology Corporation (Assa Abloy AB)
• Inventors: Dyball, Christopher J.
• Primary Examiner(s): PAYER, HWEI SIU CHOU
• Application Number:
  US08/172,878
• Time in Patent Office: 531 Days
• Field of Search: 283/85, 283/86, 283/93, 346/76 L, 235/454, 235/487, 358/448, 358/457, 358/462, 430/140
• US Class Current: 283/86
• CPC Class Codes: B42D 25/00 Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof printing processes to produce identification or security features B41M3/14
• CPC Class Codes: B42D 25/23 Identity cards
• CPC Class Codes: B42D 25/309 Photographs
• CPC Class Codes: B42D 25/41 using electromagnetic radiation B42D25/435 takes precedence
• CPC Class Codes: B42D 25/435 using electromagnetic radiation, e.g. laser

Abstract

An optical data identification card for an individual containing a photograph of the authorized user and a strip of optical contrast laser recording material with a laser-written macroscopic bi-level image of the authorized user to authenticate the photograph. The bi-level image is constructed by applying a dither matrix to a digital image file corresponding to the photograph. Each dark pixel consists of an array of high-density laser recorded spots or lines.

Claims

1. A method for producing a laser-imaged identification card for an individual user comprising:

providing a self-supporting card-sized substrate

overlaying reflective laser recording material on said self-supporting card-sized substrate;

applying a dither matrix of pixel threshold values to an image of the card user'"'"'s face to produce a dithered representation of said image; and

recording said dithered representation onto said laser recording material in a macroscopic format by means of a laser beam, producing a laser-written image being visually perceivable by reflecting visible light.

2. The method of claim 1 further comprising:

overlaying a photographic recording material containing said image of the card user'"'"'s face on said substrate in a format visually comparable to said dithered representation.

3. The method of claim 1 wherein recording said dithered representation comprises laser writing a plurality of spots onto said laser recording material, each of said spots corresponding to a pixel in said image of the card user'"'"'s face which exceeds its associated pixel threshold.

4. The method of claim 1 wherein recording said dithered representation comprises laser writing a plurality of lines in said laser recording material, each of said lines corresponding to a pixel in said image of the card user'"'"'s face which exceeds its associated pixel threshold.

5. The method of claim 1 further comprising:

generating a digital image file corresponding to said image of the card user'"'"'s face; and

recording said digital image file in said laser recording material in a machine readable format.

7. The card of claim 1 wherein each of said threshold exceeding pixels is represented by a plurality of said laser-written spots.

6. A laser image identification card for an individual user comprising:

a card-sized self-supporting substrate;

a reflective recording material overlaying said substrate defining an unrecorded area; and

a laser written image of a face of said user disposed on said recording material, said image having pixels each including an intensity which exceeds that of an associated threshold in a dither matrix, each pixel intensity represented by at least one spot.

8. The card of claim 6 wherein said image comprises a plurality of laser-written lines, each of said lines corresponding to a pixel in said image which exceed a threshold value associated with said pixel in a dither matrix.

9. The card of claim 8 wherein each of said threshold exceeding pixels is represented by a plurality of said laser-written lines.

10. An identification card for an individual user comprising in combination:

a card-sized self-supporting substrate; and

laser recording material overlaying said substrate, defining a data strip, said data strip containing both a laser-written image of the face of said user and data, and said laser written image being visually perceivable.

11. The card of claim 10 further including a photographic image of the card user disposed on a surface of said substrate.

12. The card of claim 11 wherein said photographic image is generated from a digital image file.

13. The card of claim 12 wherein said laser written image is disposed on said laser recording material in machine readable format.

14. The card of claim 11 wherein said laser-written image is a dithered representation of said photographic image.

15. The card of claim 14 wherein said laser-written image comprises a plurality of spots.

16. The card of claim 14 wherein said laser-written image comprises a plurality of lines.

17. The card of claim 11 wherein said photographic image and said laser-written image are disposed adjacent to one another on a major surface of said substrate.

18. The card of claim 11 wherein said photographic image is disposed on a first major surface of said substrate and said laser-written image is disposed on a second major surface of said substrate opposed to said first major surface.

19. The card in claim 10 wherein said image has pixels, each with an intensity which exceeds that of an associated threshold in a dither matrix, each pixel intensity represented by at least one spot.