Printhead incorporating rows of ink ejection nozzles

• US 7,735,963 B2
• Filed: 01/22/2008
• Issued: 06/15/2010
• Est. Priority Date: 10/16/1998
• Status: Expired due to Fees

• Current Assignee: Memjet Technology Ltd. (Memjet Limited)
• Original Assignee: Silverbrook Research Pty Limited
• Inventors: Silverbrook, Kia
• Primary Examiner(s): Nguyen; Thinh H
• Application Number:
  US12/017,926
• Publication Number:
  US 20080111853A1
• Time in Patent Office: 875 Days
• Field of Search: 347/20, 347 40- 43, 347/47, 347/49
• US Class Current: 347/42
• CPC Class Codes: B41J 2/04528 aiming at warming up the head
• CPC Class Codes: B41J 2/04541 Specific driving circuit
• CPC Class Codes: B41J 2/04543 Block driving
• CPC Class Codes: B41J 2/04553 detecting ambient temperature
• CPC Class Codes: B41J 2/04563 detecting head temperature; Ink temperature
• CPC Class Codes: B41J 2/04585 controlling heads based on thermal bent actuators
• CPC Class Codes: B41J 2/04588 using a specific waveform
• CPC Class Codes: B41J 2/04591 Width of the driving signal being adjusted
• CPC Class Codes: B41J 2/14 Structure thereof only for on-demand ink jet heads
• CPC Class Codes: B41J 2/14427 Structure of ink jet print heads with thermal bend detached actuators
• CPC Class Codes: B41J 2/16 Production of nozzles
• CPC Class Codes: B41J 2/1623 bonding and adhesion
• CPC Class Codes: B41J 2/1628 dry etching
• CPC Class Codes: B41J 2/1631 photolithography
• CPC Class Codes: B41J 2/1632 machining
• CPC Class Codes: B41J 2/1635 dividing the wafer into individual chips
• CPC Class Codes: B41J 2/1637 molding
• CPC Class Codes: B41J 2/1639 sacrificial molding
• CPC Class Codes: B41J 2/1642 thin film formation by CVD [chemical vapor deposition]
• CPC Class Codes: B41J 2/1646 thin film formation by sputtering
• CPC Class Codes: B41J 2/1648 : Production of print heads with thermal bend detached actuators
• CPC Class Codes: B41J 2002/14491 : Electrical connection

Abstract

A printhead is provided for an inkjet printer. The printhead includes a wafer assembly defining rows of spaced apart ink supply channels. Rows of ink ejection nozzle groups extend from the wafer assembly. Each nozzle group includes a pair of rows of ink ejection nozzles. Each ink ejection nozzle includes an ink ejection head from which an elongate actuator tail extends. All of the ink ejection heads of each group are in fluid communication with a respective ink supply channel.

Claims

1. A printhead for an inkjet printer, the printhead comprising:

a wafer assembly defining rows of spaced apart ink supply channels; and

rows of ink ejection nozzle groups extending from the wafer assembly, each nozzle group including a pair of rows of ink ejection nozzles, each ink ejection nozzle including an ink ejection head from which an elongate actuator tail extends, all of the ink ejection heads of each group being in fluid communication with a respective ink supply channel, wherein

in each nozzle group, the actuator tails of one pair of rows of ink ejection nozzles extend in an opposite direction to the actuator tails of the other pair of rows of ink ejection nozzles.

2. A printhead as claimed in claim 1, wherein the rows of ink supply channels and rows of ink ejection nozzle groups are stepped rows.

3. A printhead as claimed in claim 1, wherein each row of ink ejection nozzles is straight.