Permanent photoreceptor marking system

• US 6,221,552 B1
• Filed: 01/19/2000
• Issued: 04/24/2001
• Est. Priority Date: 01/19/2000
• Status: Expired due to Term

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Grabowski, Edward F, Street, Terry L
• Primary Examiner(s): CHAPMAN, MARK A
• Application Number:
  US09/487,573
• Time in Patent Office: 461 Days
• Field of Search: 430/130, 430/136, 283/93, 283/100, 428/916
• US Class Current: 430/130
• CPC Class Codes: G03G 5/04 Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
• CPC Class Codes: Y10S 428/916 Fraud or tamper detecting

Abstract

A method for permanently marking a photoreceptor surface includes the steps of irradiating a surface of a photoreceptor with an irradiation source to permanently mark the photoreceptor, and ablating material from the photoreceptor to at least one controlled depth in the photoreceptor with the irradiation source.

Claims

1. A method for permanently marking a photoreceptor surface, comprising the steps of:

irradiating a surface of a photoreceptor with an irradiation source to permanently mark said photoreceptor, and

ablating material from said photoreceptor to at least one controlled depth in said photoreceptor with said irradiation source.

2. The method of claim 1, wherein said photoreceptor comprises a charge generating layer comprising an organic charge generating material.

3. The method of claim 1, wherein said photoreceptor comprises a charge generating layer comprising an inorganic charge generating material.

4. The method of claim 1, wherein said mark is a registration mark for locating charge deficient spots on said photoreceptor.

5. The method of claim 1, wherein said mark is a data mark positioned in a non-imaging area of said photoreceptor.

6. The method of claim 1, wherein said mark is a data mark positioned in an imaging area of said photoreceptor.

7. The method of claim 6, wherein said data mark creates an image during development that is visible only under magnification.

8. The method of claim 6, wherein said data mark creates an image during development that is visible without magnification.

9. The method of claim 1, wherein said mark is a fiducial mark for authenticating the photoreceptor or for authenticating prints produced therefrom.

10. The method of claim 1, wherein said irradiation source is a laser.

11. The method of claim 10, wherein said laser is selected from the group consisting of a solid state laser, an infrared laser, a free electron laser, a gas discharge laser, a visible light laser, and an ultraviolet laser.

12. The method of claim 11, wherein said laser is an ultraviolet laser selected from the group consisting of an excimer laser and the third or fourth harmonic of a solid state laser.

13. The method of claim 12, wherein said laser is an excimer laser selected from the group consisting of a KrF laser, a XeF laser, a XeCl, and an ArF laser.

14. The method of claim 11, wherein said laser is a Rf CO₂ laser or a TEA CO₂ laser.

15. The method of claim 1, wherein said at least one controlled depth is an entire depth of a surface layer of said photoreceptor.

16. The method of claim 1, wherein said at least one controlled depth is an entire depth said photoreceptor exclusive of a substrate layer.

17. The method of claim 1, wherein said mark has a diameter of less than 40 μ

m.

18. A method for registering charge deficient spots on a photoreceptor surface, comprising the steps of:

locating a charge deficient spot on a photoreceptor;

irradiating a surface of said photoreceptor with an irradiation source to permanently mark said photoreceptor, and

ablating material from said photoreceptor to at least one controlled depth in said photoreceptor with said irradiation source,

wherein said mark registers the location of the charge deficient spot.