Universal printhead

• US 6,426,768 B1
• Filed: 01/25/2001
• Issued: 07/30/2002
• Est. Priority Date: 01/25/2001
• Status: Expired due to Fees

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Kubelik, Igor
• Primary Examiner(s): PENDEGRASS, JOAN H
• Application Number:
  US09/770,000
• Publication Number:
  US 20020097313A1
• Time in Patent Office: 551 Days
• Field of Search: 347/120, 347/123, 347/127, 347/128
• US Class Current: 347/123
• CPC Class Codes: B41J 2/415 by passing charged particles through a hole or a slit

Abstract

A method and apparatus for a universal printhead is disclosed that functions independently of the diameter of a charge receiving dielectric drum, while optimizing print quality. The printhead includes two sets of electrodes mutually separated by a dielectric. Each of the electrodes from the first layer crosses each of the electrodes from the second layer forming a plurality of charge generating sites. The charge generating sites are generally disposed in only two rows.

Claims

1. A printhead for use in an image forming system, comprising:

a first plurality of segmented electrodes coupled to a layer of dielectric material; and

a second plurality of electrodes coupled to said dielectric material, wherein one or more of said first plurality of electrodes intersects one or more of said second plurality of electrodes to form a plurality of charge generating sites, said charge generating sites being generally arranged along only a pair of rows.

2. The printhead of claim 1, wherein said second plurality of electrodes comprises a plurality of finger electrodes arranged in a plurality of rows, each of said plurality of finger electrodes being coupled to a contact pad and disposed transverse to said plurality of RF-line electrodes.

3. The printhead of claim 1, wherein said second plurality of electrodes comprises a plurality of finger electrodes arranged into sub-sets, further comprising a contact pad coupled to at least one finger electrode from each of said sub-sets of said second plurality of electrodes, and said second plurality of electrodes disposed transverse to said first plurality of electrodes.

4. The printhead of claim 1, wherein said second plurality of electrodes comprises a plurality of finger electrodes, wherein a pair of finger electrodes from said plurality of finger is coupled to a contact pad.

5. The printhead of claim 4, wherein said second plurality of electrodes comprises a plurality of collector lines intersecting with said plurality of finger electrodes.

6. The printhead of claim 5, wherein said plurality of collector lines comprise a first plurality of electrode segments and a second plurality of electrode segments extending outwardly from said first plurality of electrode segments, said second plurality of electrode segments intersecting with said finger electrodes to form said charge generating sites.

7. The printhead of claim 1, wherein each of said pair of rows is substantially linear.

8. The printhead of claim 7, wherein said pair of rows is generally parallel relative to each other.

9. An image forming system, comprising:

an image forming device including a printhead, said printhead comprising;

a first plurality of electrodes having a generally planar disposition and being segmented;

a second plurality of electrodes having a generally planar disposition layered upon and oriented substantially parallel with said first plurality of electrodes and forming a plurality of charge generating sites with said first plurality of electrodes, said sites being generally disposed in two rows; and

a layer of dielectric material separating said first plurality and said second plurality of electrodes.

10. The printhead of claim 9 wherein said first plurality of electrodes comprises two elongate electrodes.

11. The printhead of claim 10, wherein said second plurality of electrodes comprises a plurality of finger electrodes, each of said plurality of finger electrodes being coupled to a contact pad and disposed transverse to said first plurality of electrodes.

12. The printhead of claim 9, wherein said second plurality of electrodes comprises a plurality of finger electrodes arranged into sub-sets, further comprising a contact pad coupled to at least one finger electrode from each of said sub-sets of said second plurality of electrodes, said second plurality of electrodes disposed transverse to said first plurality of electrodes.

13. The printhead of claim 9, wherein said second plurality of electrodes comprises a plurality of finger electrodes, wherein a pair of finger electrodes from said plurality of finger is coupled to a contact pad.

14. The printhead of claim 13, wherein said first plurality of electrodes comprises a plurality of collector lines coupled to said plurality of finger electrodes.

15. The printhead of claim 14, wherein said plurality of collector lines comprise a first plurality of electrode segments and a second plurality of electrode segments extending outwardly from said first plurality of electrode segments said second of electrode segments intersecting with said finger electrodes to form said charge generation sites.