Pagewidth Printhead Unit

• US 20090256889A1
• Filed: 06/28/2009
• Published: 10/15/2009
• Est. Priority Date: 08/09/2004
• Status: Active Grant

• Current Assignee: Silverbrook Research Pty Limited
• Original Assignee: Silverbrook Research Pty Limited
• Inventors: Silverbrook, Kia, Lapstun, Paul
• Granted Patent: US 7,891,772 B2
• Time in Patent Office: Days
• US Class Current: 347/50
• CPC Class Codes: C09B 47/085 substituting the central metal atom
• CPC Class Codes: C09D 11/32 characterised by colouring agents
• CPC Class Codes: C09D 11/328 characterised by dyes
• CPC Class Codes: Y10T 428/24802 Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]

Abstract

The invention provides for a pagewidth printhead unit for a printer. The unit includes two integrated circuits laid end-to-end, each having micro-electromechanical nozzles for ejecting printing fluid. The unit also includes an ink distribution plate for feeding printing fluid into apertures defined in the integrated circuits, and an ink distribution molding defining a plurality of elongate conduits for distributing printing fluid to the plate along a length of the printhead. The unit further includes a printed circuit board (PCB) configured to relay data signals from a printer controller to respective ends of the integrated circuits, as well as a support member for holding the integrated circuits, plate, molding and PCB in alignment.

Claims

1. A pagewidth printhead unit for a printer, said unit comprising:

two integrated circuits laid end-to-end, each having an array of micro-electromechanical nozzles for ejecting printing fluid;

an ink distribution plate for feeding printing fluid into apertures defined in the integrated circuits;

an ink distribution molding for distributing printing fluid to the plate along a length of the printhead;

a printed circuit board (PCB) configured to relay data signals from a printer controller to respective ends of the integrated circuits; and

a support member for holding the integrated circuits, plate, molding and PCB in alignment.

2. The printhead of claim 1, wherein the PCB is flexible and extends the length of the printhead and includes first and second electrical connectors.

3. The printhead of claim 2, wherein the electrical connectors define respective flexible connectors having contact areas operatively positioned in contact with respective output connectors from the printer controller.

4. The printhead of claim 2, which includes busbars positioned to provide drive current to the micro-electromechanical nozzles, the busbars retained in position at one end by a socket, and at both ends by wrap-around wings of the flexible PCB.

5. The printhead of claim 1, wherein the molding defines sets of fluid apertures along a length thereof to distribute printing fluids from the conduits to the ink distribution plate.

6. The printhead of claim 5, wherein the molding includes a plug with nozzles at an end thereof, the plug operatively fitting in a corresponding socket of the printer to receive printing fluids therefrom.

7. The printhead of claim 1, wherein the distribution plate is a multi-layer construction for distributing printing fluid selected from the group consisting of colored inks, infrared inks, ink fixatives and pressurized air.