Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
1999-10-19
2001-10-30
Nguyen, Thinh (Department: 2861)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
C347S020000, C347S044000
Reexamination Certificate
active
06309048
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to the construction of inkjet printing arrangements having a series of nozzles for the ejection of ink utilizing multiple layer deposition techniques.
BACKGROUND OF THE INVENTION
Recently, for example, in PCT Application No. PCT/AU98/00550 the present applicant has proposed an inkjet printing device which utilizes micro-electromechanical (MEMS) processing techniques in the construction of a thermal bend actuator type device for the ejection of fluid from a nozzle chamber.
The aforementioned application discloses an actuator which is substantially exposed to an external atmosphere, often adjacent a print media surface. This is likely to lead to substantial operational problems in that the exposed actuator could be damaged by foreign objects or paper dust etc. leading to a malfunction.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide for an inkjet print head with a series of actuators, the actuators operating in a protected environment.
In accordance with a first aspect of the present invention, there is provided an inkjet printhead comprising:
a plurality of nozzle chambers each having an ink ejection aperture in one wall thereof and an actuator interconnection aperture in a second wall thereof;
a moveable ink ejection paddle located within the nozzle chamber and moveable under the control of an external thermal actuator through said actuator interconnection aperture for the ejection of ink out of said ink ejection aperture;
said external actuator being covered by a protective covering shell around the operational portions of said actuator, spaced apart from said actuator.
The protective covering shell can be formed simultaneously with the formation of other portions of the inkjet printing arrangement in particular with the nozzle chamber walls.
The protective covering shell can be formed by deposition and etching of a sacrificial material layer followed by deposition and etching of an inert material layer forming the covering shell.
The external actuator can comprise a thermal bend actuator.
REFERENCES:
patent: 6027205 (2000-02-01), Herbert
patent: 6239821 (2001-05-01), Silverbrook
Nguyen Thinh
Silverbrook Research Pty Ltd
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