Method for creating a fingerprint image on an optical memory card

• US 20040060989A1
• Filed: 10/01/2002
• Published: 04/01/2004
• Est. Priority Date: 10/01/2002
• Status: Active Grant

• Current Assignee: LaserCard Corp. (Assa Abloy AB)
• Original Assignee: LaserCard Corp. (Assa Abloy AB)
• Inventors: Bove, John M.
• Granted Patent: US 6,834,798 B2
• Time in Patent Office: Days
• US Class Current: 235/494
• CPC Class Codes: G06V 40/13 Sensors therefor

Abstract

A method for imaging a fingerprint on an optical memory card having an upper transparent cover, a base and optical medium therebetween, wherein a cardholder imprints a fingerprint having a pattern of ridges and valleys on the upper cover of the card and a laser beam is scanned over the fingerprint. The laser beam is selectively transmitted by the fingerprint. The laser beam burns pits into optical medium areas corresponding to valleys of the fingerprint and is prevented from burning pits into optical medium areas corresponding to the ridges, thus producing a fingerprint image comprising light and dark areas in the optical medium corresponding to the pattern of ridges and valleys of the user'"'"'s fingerprint.

Claims

1. A method for imaging a fingerprint on an optical memory card having an upper transparent cover, a base and an optical medium therebetween, comprising:

placing a finger on said upper transparent cover and leaving a fingerprint, including a pattern of ridges and valleys, on said upper transparent cover;

removing said finger from said upper transparent cover; and

directing a laser beam at said fingerprint wherein said laser beam alters optical medium portions beneath the fingerprint corresponding to said valleys and said laser is prevented from altering optical medium portions beneath the fingerprint corresponding to said ridges, said altered and non-altered portions forming an image of said fingerprint on said optical medium.

2. The method of claim 1 wherein altering said optical medium comprises burning a pit on said medium.

3. The method of claim 1 further comprising said ridges refracting said laser beam.

4. The method of claim 1 wherein said ridges refract said laser beam thus preventing said beam from altering said optical medium.

5. The method of claim 1 wherein said laser is directed at said fingerprint at a constant writing power.

6. The method of claim 1 wherein said altered portion of said optical medium is relatively darker than said non-altered portion.

7. The method of claim 1 wherein said fingerprint is imprinted with oil from said finger.

8. The method of claim 1 further comprising moistening a portion of said finger to be placed on said upper transparent cover prior to leaving said fingerprint on said transparent surface.

9. The method of claim 8 wherein said finger is moistened with oil.

10. The method of claim 1 further comprising removing said fingerprint from said upper transparent surface after said image of said fingerprint is produced.

11. The method of claim 1 wherein said image of said fingerprint is eye readable.

12. The method of claim 1 wherein placing said finger on said upper transparent cover includes rolling said finger on said upper transparent cover.

13. The method of claim 1 further comprising placing said optical memory card in a reader/writer unit before directing said beam at said fingerprint.

14. The method of claim 1 wherein said fingerprint image is tamper resistant.

15. The method of claim 1 wherein directing said laser beam and forming said fingerprint image occur in a single step.

16. The method of claim 1 further comprising a user imprinting a test fingerprint and comparing said test imprinted fingerprint with said fingerprint image to verify said user'"'"'s identity.

17. A method for creating a fingerprint image, comprising:

providing an optical memory card having two cover sheets, at least one of which is transparent, and an optical medium therebetween;

providing a fingerprint on one of said transparent optical covers; and

directing a laser beam at said fingerprint wherein said fingerprint selectively transmits said laser beam to said optical medium, creating an image of said fingerprint on said optical medium.

18. The method of claim 17 wherein said fingerprint includes a pattern of ridges and valleys and wherein said laser beam burns spots onto said optical medium disposed beneath said valleys and fails to burn spots onto said optical medium disposed beneath said ridges.

19. The method of claim 18 wherein said ridges refract said laser beam, preventing said laser beam from burning optical medium disposed beneath said ridges.

20. The method of claim 17 wherein said fingerprint image includes laser pits.

21. The method of claim 20 wherein said laser beam burns said pits into said optical medium.

22. The method of claim 17 wherein providing a fingerprint includes rolling a finger having oil on said transparent cover.

23. The method of claim 17 further comprising removing said fingerprint after creating an image of said fingerprint.

24. The method of claim 17 further comprising a user imprinting a test fingerprint and comparing said test imprinted fingerprint with said image fingerprint to verify said user'"'"'s identity.

25. The method of claim 24 wherein said test fingerprint is imprinted on said card cover.