Hewlett-packard Development Company, L.p.

Hewlett-packard Company

Paul A Richards

Alexander N Govyadinov

Lawrence H White

Chris Bakker

Nick McGuinness

Erik D Torniainen

David P Markel

James A Feinn

Thomas R Strand

Albert Nagao

Steven H Walker

William James Allen

Matthew Allen Shepherd

Arun K Agarwal

Erick Blane Kinas

George C Ross

Galen P Cook

Nicholas Matthew Cooper McGuinness

Tommy D Deskins

Tom Deskins

Thomas A Strand

A fluid ejection system may include a media transport assembly and a printhead assembly having a fluid ejection device opposite the media transport assembly. The fluid ejection device may include a drop ejecting element and a fluid ejection chamber containing the drop ejection element. The fluid ejection chamber has an inlet and an outlet for fluid circulation through the fluid ejection chamber across the drop ejecting element. A particle tolerant architecture is between the inlet and the drop ejecting element.

Fluid ejection device

A fluid ejection device includes a fluid slot, at least one fluid ejection chamber communicated with the fluid slot, a drop ejecting element within the at least one fluid ejection chamber, a fluid circulation channel communicated with the fluid slot and the at least one fluid ejection chamber, and a fluid circulating element communicated with the fluid circulation channel. The fluid circulating element is to provide on-demand circulation of fluid from the fluid slot through the fluid circulation channel and the at least one fluid ejection chamber.

A fluid ejection device includes a fluid slot, a fluid ejection chamber communicated with the fluid slot, a drop ejecting element within the fluid ejection chamber, a fluid circulation channel communicated at a first end with the fluid slot and communicated at a second end with the fluid ejection chamber, and a particle tolerant architecture within the fluid circulation channel at the second end.

A fluid ejection device includes a fluid slot, a fluid ejection chamber communicated with the fluid slot, a drop ejecting element within the fluid ejection chamber, a fluid circulation channel communicated at one end with the fluid slot and communicated at another end with the fluid ejection chamber, a fluid circulating element within the fluid circulation channel, and a channel wall separating the fluid ejection chamber and the fluid circulation channel. The fluid circulation channel includes a channel loop, and a width of the channel wall is based on a width of the channel loop and a width of the fluid ejection chamber.

An inkjet nozzle includes an aperture with a noncircular opening having a first segment substantially defined by a first polynomial equation and a second segment substantially defined by a second equation.

Noncircular inkjet nozzle

A fluid ejection apparatus may include a drop generator to eject fluid droplets in a vertical direction and a fluid channel containing the drop generator. The fluid channel may include a vertical inlet through which fluid is to enter the fluid channel and a vertical outlet through which fluid not ejected by the drop generator is to be circulated out of the fluid channel.

Fluid ejection apparatus with vertical inlet/outlet and fluid pump

According to an example, a fluid ejection device may include a fluid feed slot, a plurality of fluid ejection chambers in fluid communication with the fluid feed slot, a plurality of drop ejecting elements, in which a drop ejecting element of the plurality of drop ejecting elements is positioned within each of the plurality of fluid ejection chambers, a fluid circulation channel in fluid communication at a first end of the fluid circulation channel with the fluid feed slot and in fluid communication at multiple second ends of the fluid circulation channel with the plurality of fluid ejection chambers, and a fluid circulating element within the fluid circulation channel. The fluid ejection device may also include a bubble dissipating structure positioned within the fluid circulation channel outside of the plurality of fluid ejection chambers.

Fluid ejection device with a fluid recirculation channel

In some examples, a fluid nozzle includes an aperture comprising a first lobe that is shaped as an ellipse, and a second lobe that has a non-circular shape and has a different size than a size of the first lobe. The fluid nozzle further includes protrusions between the first and second lobes extending inward and forming a throat between the first and second lobes.

The examples provide a fluid ejection apparatus that includes a fluid slot; a passage, a drop generator and a fluid circulation pump. The passage has an inlet connected to the fluid slot and an outlet spaced from the inlet and connected to the fluid slot. The passage as a first portion extending in a first direction from the inlet and a second portion extending from the first portion to the outlet in a second direction, opposite to the first direction. A filter is within the fluid slot across the inlet.

Fluid ejection apparatus with fluid supply floor filter

A fluid ejection device includes a fluid slot, a fluid ejection chamber communicated with the fluid slot, a drop ejecting element within the fluid ejection chamber, a fluid circulation channel communicated at a first end with the fluid slot and communicated at a second end with the fluid ejection chamber, a fluid circulating element within the fluid circulation channel, and a particle tolerant architecture within the fluid circulation channel at the second end.

Fluid ejection apparatus with filter

A fluid ejection apparatus () and method eject a droplet of fluid using a drop generator () receiving fluid from a passage () having an inlet () adjacent a fluid slot () and an outlet () spaced from the inlet () and adjacent the fluid slot (). Fluid is drawn through a filter () with a pump () within the passage () that pumps the fluid towards the inlet () to the drop generator ().

Fluid ejection apparatus

A fluid dispenser is disclosed herein. An example of such a fluid dispenser includes a housing configured to store a quantity of fluid and an ejection assembly configured to controllably emit the fluid through a nozzle. The fluid dispenser also includes a fluid chamber configured both to supply a quantity of the fluid to the ejection assembly and to define a fluid flow path between the housing and the ejection assembly. The fluid dispenser further includes a filter positioned in the fluid flow path and configured both to conduct the fluid from the housing to the fluid chamber and to restrain particles in the fluid from entering the fluid chamber. The filter is further configured to define a bubble flow path that facilitates conduction of bubbles from the fluid chamber to the housing. Additional features of this fluid dispenser are disclosed herein, as are other examples of fluid dispensers.

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Corvallis, OR, United States of America

Paul A Richards