Inkjet printhead incorporating interleaved actuator tails

• US 7,748,827 B2
• Filed: 04/16/2007
• Issued: 07/06/2010
• 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): Meier; Stephen D
• Assistant Examiner(s): Liang; Leonard S
• Application Number:
  US11/735,961
• Publication Number:
  US 20070182785A1
• Time in Patent Office: 1,177 Days
• Field of Search: 347/40, 347/42, 347/44, 347/47, 347/56, 347/61, 347/65, 347/50, 347/48, 347/54
• US Class Current: 347/44
• 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 2/04565 detecting heater resistance
• 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 2/04596 Non-ejecting pulses
• CPC Class Codes: B41J 2/14427 Structure of ink jet print heads with thermal bend detached actuators
• CPC Class Codes: B41J 2/1626 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 2/1639 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 spaced groups of ink supply channels. Groups of ink ejection nozzle arrangements extend from the wafer assembly and are in fluid communication with respective ink supply channel groups. Each group of nozzle arrangements includes a pair of rows of nozzle arrangements. Each nozzle arrangement includes an ink ejection head from which an actuator tail extends and is arranged so that actuator tails of one group of nozzle arrangements are interleaved with actuator tails of any adjacent groups of nozzle arrangements.

Claims

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

a wafer assembly defining spaced groups of ink supply channels; and

groups of ink ejection nozzle arrangements extending from the wafer assembly and in fluid communication with respective ink supply channel groups, each group of nozzle arrangements comprising a pair of rows of nozzle arrangements, each nozzle arrangement comprising an ink ejection head from which an actuator tail extends and being arranged so that actuators of one group of nozzle arrangements are interleaved with actuators of adjacent groups of nozzle arrangements.

2. A printhead as claimed in claim 1, wherein each nozzle arrangement comprises:

one of the ink ejection heads in the form of a nozzle chamber structure, the nozzle chamber structure mounted to the wafer assembly and defining a nozzle chamber for receiving ink from one of the ink supply channels and a raised nozzle rim through which ink in the nozzle chamber can be ejected;

an anchor extending from the wafer assembly in a location external to the nozzle chamber; and

one of the actuators in the form of an elongate thermal actuator mechanism, the thermal actuator mechanism extending from the anchor and into the nozzle chamber, the thermal actuator mechanism comprising an elongate arm which terminates in a free end within the nozzle chamber and a pair of layers of conductive material located on either side of the elongate arm, one of the layers being connected to a current supply so that, in use, the free end of the arm can be moved to eject ink in the nozzle chamber through the nozzle rim as a result of differential thermal expansion.

3. A printhead as claimed in claim 2, wherein each row is staggered and comprises a plurality of linearly arranged sets of nozzle arrangements with adjacent sets being staggered relative to each other along the row.

4. A printhead as claimed in claim 3, wherein the sets form a plurality of ascending or descending steps.

5. A printhead as claimed in claim 3, wherein the layers of conductive material are located proximal to the anchor.

6. A printhead as claimed in claim 1, wherein the nozzle arrangements are arranged so that the actuators collectively extend outwardly on either side of the ink ejection heads which, in turn, are centrally located.

7. A printhead as claimed in claim 1, wherein each nozzle arrangement defines a pair of ink spread restriction pits extending between the rows.

8. A printhead as claimed in claim 7, wherein each group of nozzle arrangements includes an ink spread restriction wall extending from the wafer assembly to border the pair of ink spread restriction pits.