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Fluid ejection device

A technology of fluid injection and fluid chamber, applied in the direction of inking device, printing, etc., which can solve the problems of physical damage, rapid corrosion of resistors, failure of heating elements, etc.

Active Publication Date: 2013-02-27
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Once the ink penetrates the surface material applied to the heating element and contacts the hot high voltage resistor surface, rapid corrosion and physical damage to the resistor will occur very quickly, rendering the heating element ineffective

Method used

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Examples

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Embodiment Construction

[0018] figure 1 One example of an inkjet print cartridge 100 that may contain a fluid ejection device as disclosed herein is shown, according to one embodiment. In this embodiment, the fluid ejection device is disclosed as a droplet inkjet printhead 102 . Print cartridge 100 includes a cartridge body 104 , a printhead 102 and electrical contacts 106 . Cartridge 104 contains ink or other suitable fluid that is supplied to printhead 102 . Individual drop generators in printhead 102 are energized by electrical signals provided at contacts 106 to eject droplets from selected nozzles 108 . Print cartridge 100 may contain its own fluid supply, such as ink in cartridge body 104, or print cartridge may receive ink from an external source (not shown), such as a fluid reservoir connected to print cartridge 100 by, for example, a tube. A print cartridge 100 that contains its own fluid supply is generally disposable once the fluid supply is depleted.

[0019] figure 2 A perspective ...

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Abstract

A fluid ejection device includes a thin film heater resistor portion having a heater resistor, and a two-layer structure disposed over the heater resistor. The two-layer structure includes a top layer and a bottom layer, with the top layer having a hardness that is at least 1.5 times greater than the hardness of the bottom layer.

Description

Background technique [0001] In a typical inkjet printing system, an inkjet printhead ejects droplets of fluid (eg, ink) through a plurality of nozzles toward a print medium, such as paper, so as to print an image on the print medium. The nozzles are typically arranged in one or more groups such that when the printhead and print medium are moved relative to each other, ink is ejected from the nozzles in an appropriate sequence such that characters or other images are printed on the print medium. [0002] Thermal bubble inkjet printheads eject fluid drops from nozzles by passing electrical current through a heating element, which generates heat and vaporizes a small portion of the fluid in the firing chamber. The current is supplied in pulses lasting on the order of 2 microseconds. When a pulse of electrical current is supplied, the heat generated by the heating element creates rapidly expanding vapor bubbles that force small droplets out of the nozzles of the firing chamber. ...

Claims

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Application Information

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IPC IPC(8): B41J2/175B41J2/05
CPCB41J2/17526B41J2202/03B41J2/14129
Inventor J.E.小阿博S.阿贾伊S.本加利S.霍尔瓦思G.S.龙S.普拉卡什A.I-T.潘M.S.沙拉维R.A.普格利斯
Owner HEWLETT PACKARD DEV CO LP
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