Printhead having relatively dimensioned ejection ports and arms

• US 8,029,102 B2
• Filed: 02/08/2011
• Issued: 10/04/2011
• Est. Priority Date: 07/15/1997
• Status: Expired due to Fees

• Current Assignee: Memjet Technology Ltd. (Memjet Limited)
• Original Assignee: Silverbrook Research Pty Limited
• Inventors: Silverbrook, Kia
• Primary Examiner(s): DO, AN H
• Application Number:
  US13/023,265
• Publication Number:
  US 20110122201A1
• Time in Patent Office: 238 Days
• Field of Search: 347/54, 347/56, 347/65
• US Class Current: 347/54
• CPC Class Codes: B41J 2/04 generating single droplets or particles on demand
• CPC Class Codes: B41J 2/05 produced by the application of heat
• CPC Class Codes: B41J 2/14427 Structure of ink jet print heads with thermal bend detached actuators
• CPC Class Codes: B41J 2/1601 Production of bubble jet print heads B41J2/1606, B41J2/162 take precedence
• 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 2/1645 thin film formation by spincoating
• 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 2002/14435 Moving nozzle made of thermal bend detached actuator
• CPC Class Codes: B41J 2202/15 Moving nozzle or nozzle plate
• CPC Class Codes: B41J 2202/21 Line printing

Abstract

A printhead is provided having chambers for fluid, ejection ports defined in the chambers, and ejection arms positioned in the chambers, each arm having a displacement area which is displaced against fluid in the respective chamber to eject the fluid from the respective ejection port. Each displacement area is greater than half an area of the respective ejection port and less than twice the area of that ejection port.

Claims

1. A printhead comprising:

chambers for fluid;

ejection ports defined in the chambers; and

ejection arms positioned in the chambers, each arm having a displacement area which is displaced against fluid in the respective chamber to eject the fluid from the respective ejection port, each displacement area being greater than half an area of the respective ejection port and less than twice the area of that ejection port.

2. A printhead according to claim 1, wherein each chamber has sidewalls spanned by a roof in which the respective ejection port is defined.

3. A printhead according to claim 2, wherein the displacement area of each arm spans an area of the respective chamber between two of the sidewalls which oppose one another.

4. A printhead according to claim 3, wherein each arm extends from an anchor external to the respective chamber through an opening defined one of the sidewalls of said chamber.

5. A printhead according to claim 4, wherein the openings of the chambers are sealed by a respective sealing arrangement to inhibit fluid egress therethrough.

6. A printhead according to claim 5, wherein each arm is manufactured from polytetrafluoroethylene and has upper and lower sides with a heating element positioned proximate the lower side.