公开(公告)号：US20180290449A1

公开(公告)日：2018-10-11

申请号：US15570675

申请日：2015-07-15

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Lawrence H. White ,  David R. Thomas ,  Claire O'Cull ,  Michael Hager

IPC: B41J2/14 ,  B41J2/16

Abstract: A fluid ejection device includes a substrate; a plurality of resistors on the substrate with separation of between 4 and 8 microns between adjacent resistors; an adhesion layer applied over the plurality of resistors; and a layer of silicon carbide (SiC) applied directly over the adhesion layer such that the silicon carbide is between adjacent resistors. A method of forming a fluid ejection device includes forming resistors and conductive traces attached to a substrate; depositing an adhesion layer over the resistors; depositing a silicon carbide (SiC) coating directly over the adhesion layer; and forming an epoxy layer over silicon carbide layer.

公开(公告)号：US11214064B2

公开(公告)日：2022-01-04

申请号：US16603582

申请日：2018-04-02

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Laurie A. Coventry ,  David R. Thomas

IPC: B41J2/16 ,  B41J2/14

Abstract: In some examples, a fluidic die includes a substrate, a fluidic region comprising fluid chambers formed in a fluidic barrier layer supported by the substrate, fluidic actuators associated with the fluid chambers, electrical structures positioned away from the fluidic region, a metallic layer over the fluidic actuators, and an adherent barrier layer to adhere the metallic layer to the fluidic barrier layer. The adherent barrier layer includes a first adherent barrier layer portion comprising a dielectric layer and an adhesion layer, and a second adherent barrier layer portion comprising the adhesion layer and without the dielectric layer, the first adherent barrier layer portion formed over the electrical structures, and the second adherent barrier layer portion formed in the fluidic region, the adhesion layer of the second adherent barrier layer portion protruding into the fluid chambers.

公开(公告)号：US10562304B2

公开(公告)日：2020-02-18

申请号：US16139716

申请日：2018-09-24

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： James A. Feinn ,  Albert Nagao ,  Thomas R. Strand ,  David R. Thomas ,  Erik D. Torniainen ,  Lawrence H. White

IPC: B41J2/14

Abstract: An inkjet nozzle includes an aperture with a noncircular opening substantially defined by a polynomial equation. A droplet generator is also described which includes a firing chamber fluidically coupled to a fluid reservoir a heating resistor and a nozzle. The nozzle includes an aperture forming a passage from the firing chamber to the exterior of the droplet generator through a top hat layer. The nozzle is defined by a closed polynomial and has a mathematically smooth and mathematically continuous shape around aperture's perimeter wall, with two protrusions extending into the center of the aperture.

公开(公告)号：US20190023010A1

公开(公告)日：2019-01-24

申请号：US16139716

申请日：2018-09-24

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： James A. Feinn ,  Albert Nagao ,  Thomas R. Strand ,  David R. Thomas ,  Erik D. Torniainen ,  Lawrence H. White

IPC: B41J2/14

CPC classification number: B41J2/1433 ,  B41J2/14016 ,  B41J2002/14387 ,  B41J2002/14475 ,  B41J2202/11

Abstract: An Inkjet nozzle includes an aperture with a noncircular opening substantially defined by a polynomial equation. A droplet generator is also described which includes a firing chamber fluidically coupled to a fluid reservoir a heating resistor and a nozzle. The nozzle includes an aperture forming a passage from the firing chamber to the exterior of the droplet generator through a top hat layer. The nozzle is defined by a closed polynomial and has a mathematically smooth and mathematically continuous shape around aperture's perimeter wall, with two protrusions extending into the center of the aperture.

公开(公告)号：US20210331475A1

公开(公告)日：2021-10-28

申请号：US16603582

申请日：2018-04-02

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Laurie A. Coventry ,  David R. Thomas

IPC: B41J2/16

Abstract: In some examples, a fluidic die includes a substrate, a fluidic region comprising fluid chambers formed in a fluidic barrier layer supported by the substrate, fluidic actuators associated with the fluid chambers, electrical structures positioned away from the fluidic region, a metallic layer over the fluidic actuators, and an adherent barrier layer to adhere the metallic layer to the fluidic barrier layer. The adherent barrier layer includes a first adherent barrier layer portion comprising a dielectric layer and an adhesion layer, and a second adherent barrier layer portion comprising the adhesion layer and without the dielectric layer, the first adherent barrier layer portion formed over the electrical structures, and the second adherent barrier layer portion formed in the fluidic region, the adhesion layer of the second adherent barrier layer portion protruding into the fluid chambers.