Hewlett-packard Development Company, L.P.

Hewlett-packard Company

Ed Friesen

Rio Rivas

Garrett E Clark

Kelly Ronk

Lawrence H White

Anthony M Fuller

Silam J Choy

Donald W Schulte

Terry E McMahon

Rosanna L Bigford

Kellie Susanne Jensen

Lawrence Thurber

Erik D Torniainen

Manish Giri

Chantelle Domingue

Si-lam Choy

John B Rausch

David Douglas Hall

Roberto A Pugliese

Timothy R Emery

Siddhartha Bhowmik

Nicholas Matthew Cooper McGuinness

Terry Mcmahon

Corey Deyo

Chantelle Elizabeth Domingue

Nicholas Matthew Cooper Mcguinness

Rivas Rio

In some examples, a printhead can include a main printer fluid line, a firing chamber in fluid communication with the main printer fluid line to receive printer fluid from the main printer fluid line, and a resistor positioned in the firing chamber. The resistor can, for example, receive an electronic current to cause the resistor to heat up and eject printer fluid droplets from the printhead. The printhead can further include a photolithographically fabricated check valve positioned in the firing chamber. The check valve can, for example, be openable to allow filling of the firing chamber with printer fluid and closeable to at least partially seal the main printer fluid line from printer fluid blowback caused by the resistor.

Printhead with printer fluid check valve

A microfluidic diagnostic chip may comprise a substrate, a plurality of fluidic slots extending through the substrate, a plurality of microfluidic channels each coupled to a respective one of the plurality of fluidic slots to receive a plurality of fluids from the plurality of fluidic slots, and a mixing region in fluid communication with the plurality of fluidic slots to receive the plurality of fluids such that the plurality of fluids are to mix. A diagnostic chip may comprise a number of fluid slots defined through a substrate and a plurality of microfluidic channels coupled to the fluid slots to receive from the fluid slots a plurality of different fluids wherein the microfluidic channels combine and mix the plurality of different fluids.

Diagnostic chip

In an embodiment, a fluid ejection device includes a substrate with a fluid slot formed therein, a chamber layer formed on the substrate defining fluid chambers on both sides of the fluid slot, a thin-film layer between the substrate and chamber layer that defines an ink feedhole (IFH) between the fluid slot and the chamber layer, and a chamber layer extension that forms a bridge across the IFH between two chambers.

Fluid ejection device with ink feedhole bridge

A fluid dispenser may include an array of fluid delivery assemblies. Each fluid delivery assembly may include orifices through which fluid is to be ejected and slots. Each slot extends to a respective one of the orifices. The slots have different geometric shapes.

Fluid dispenser

A fluid ejection device may include a substrate having front and back opposing surfaces and a slot extending through the substrate between the back and front surfaces and along an axis of the substrate. A recessed end region may be formed in the back surface at each end of the slot.

Printhead with recessed slot ends

A method of forming a substrate for a fluid ejection device includes forming an opening in the substrate from a second side toward a first side, and further forming the opening in the substrate to the first side, including increasing the opening to the first side and increasing the opening at the second side, and forming the opening with substantially parallel sidewalls intermediate the first side and the second side and converging sidewalls to the first side.

Fluid feed slot for fluid ejection device

A fluid ejection cartridge may include a substrate including substrate ribs that define fluid feed slots extending from a first side to a second side of the substrate, fluid chambers having nozzle openings on a first side of the substrate, an ejection element within each of the fluid chambers and a substrate carrier on a second side of the substrate. The substrate carrier may include carrier ribs that define fluid passageways having oblique centerlines and internal widths that gradually increase from a first width proximate the substrate to a second width, greater than the first width, distant the substrate. Concavely tapered adhesive bonds directly contact faces of the substrate ribs and the carrier ribs to adhere the substrate ribs to the carrier ribs.

Fluid ejection cartridge with controlled adhesive bond

Fluid ejection devices with particle tolerant thin-film extensions are disclosed. An example apparatus includes a printer; a reservoir; and a printhead including: a firing chamber; a channel to receive fluid from the reservoir, the channel is coupled to the firing chamber, the channel having an opening; and a particle-tolerant film disposed adjacent the opening of the channel, the particle-tolerant film disposed between the channel and the reservoir, the particle-tolerant film to deter particles within the fluid from settling in an area adjacent the opening.

Fluid ejection devices with particle tolerant thin-film extensions

In an embodiment, a method of forming a printhead includes forming on a front-side surface of a substrate, a thin film layer and a plurality of fluidic channels and ejection chambers. The method also includes forming a slot through the substrate from the back-side surface to the front-side surface, where the back-side and front-side surfaces generally oppose one another. The slot has a length extending along a long axis of the substrate and a width extending along a short axis of the substrate. The method includes forming recessed regions into the back-side surface of the substrate at both ends of the slot that extend beyond the length of the slot.

A fluid dispenser is disclosed herein. An example of such a fluid dispenser includes a member configured to define a plurality of orifices through which a fluid is ejected and a manifold including a plurality of fluid passageways each of which is configured to have a different angle relative to the member. This example of a fluid dispenser additionally includes a plurality of slots each of which is coupled to a different one of the fluid passageways of the manifold to conduct the fluid from the fluid passageways towards the orifices. Additional features and modifications of this fluid dispenser are disclosed herein, as are other examples of fluid dispensers.

Controlling adhesives between substrates and carriers includes forming a depression into a bonding area of a backside surface of a substrate of a print head where the bonding area being formed proximate an ink feed slot formed through the thickness of the substrate from the backside surface to a front side surface; placing an adhesive between the bonding area and a substrate carrier, and moving the substrate and the substrate carrier together such that the adhesive flows into the depression.

Controlling adhesives between substrates and carriers

In an embodiment, a fluid ejection device includes a die including a fluid feed slot that extends from a back side to a front side of the die, a firing chamber formed on the front side to receive fluid from the feed slot, a fluid distribution manifold adhered to the back side to provide fluid to the feed slot, and a corrosion-resistant layer coating the back side of the die so as not to extend into the feed slot.

Growing community of inventors

Corvallis, OR, United States of America

Ed Friesen