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    Printhead with circulation channel
    1.
    发明授权
    Printhead with circulation channel 有权

    公开(公告)号：US11970010B2

    公开(公告)日：2024-04-30

    申请号：US17772760

    申请日：2019-11-13

    Applicant: Hewlett-Packard Development Company, L.P.

    Inventor： Jacob Lum ,  James A. Feinn ,  Mengqian Lu ,  Garrett E. Clark

    IPC: B41J2/18

    CPC classification number: B41J2/18

    Abstract: An example printhead includes a circulation channel having an inlet for receiving a fluid and an outlet for expelling the fluid, a first nozzle fluidically coupled to the circulation channel, the first nozzle being operable at a first absolute pressure, and a second nozzle fluidically coupled to the circulation channel, the second nozzle being operable at a second absolute pressure, the absolute second pressure being lower than the first absolute pressure. The absolute pressure in the circulation channel decreases as the fluid flows from the inlet to the outlet, and the first nozzle is positioned closer to the inlet of the circulation channel than the second nozzle.

    PRINTHEAD WITH CIRCULATION CHANNEL
    2.
    发明申请
    PRINTHEAD WITH CIRCULATION CHANNEL 有权

    公开(公告)号：US20220379627A1

    公开(公告)日：2022-12-01

    申请号：US17772760

    申请日：2019-11-13

    Applicant: Hewlett-Packard Development Company, L.P.

    Inventor： Jacob Lum ,  James A. Feinn ,  Mengqian Lu ,  Garrett E. Clark

    IPC: B41J2/18

    Abstract: An example printhead includes a circulation channel having an inlet for receiving a fluid and an outlet for expelling the fluid, a first nozzle fluidically coupled to the circulation channel, the first nozzle being operable at a first absolute pressure, and a second nozzle fluidically coupled to the circulation channel, the second nozzle being operable at a second absolute pressure, the absolute second pressure being lower than the first absolute pressure. The absolute pressure in the circulation channel decreases as the fluid flows from the inlet to the outlet, and the first nozzle is positioned closer to the inlet of the circulation channel than the second nozzle.

    Temperature-based actuator evaluation
    3.
    发明授权
    Temperature-based actuator evaluation 有权

    公开(公告)号：US11040530B2

    公开(公告)日：2021-06-22

    申请号：US16763032

    申请日：2018-01-24

    Applicant: Hewlett-Packard Development Company, L.P.

    Inventor： Daryl E. Anderson ,  James A. Feinn ,  Eric Martin ,  James Michael Gardner

    IPC: B41J2/045 ,  B41J2/14 ,  B41J2/145

    Abstract: In one example in accordance with the present disclosure, a fluidic system is described. The fluidic system includes a fluidic die. The fluidic die includes a substrate in which a number of fluid chambers are formed. Each fluid chamber includes a fluid actuator disposed within the fluid chamber. A number of actuator sensors are disposed on the substrate to output at least one value indicative of a sensed characteristic of fluid actuators. A number of substrate temperature sensors are also disposed on the substrate to sense a temperature for the substrate. An actuator evaluation device of the fluidic system determines a state of the fluid actuator based at least in part on the at least one value and at least one correction value associated with the temperature sensed by the number of substrate temperature sensors.

    Noncircular inkjet nozzle
    8.
    发明授权
    Noncircular inkjet nozzle 有权

    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.

    Enhancing temperature distribution uniformity across a printer die
    10.
    发明授权
    Enhancing temperature distribution uniformity across a printer die 有权

    公开(公告)号：US10112384B2

    公开(公告)日：2018-10-30

    申请号：US15874837

    申请日：2018-01-18

    Applicant: Hewlett-Packard Development Company, L.P.

    Inventor： Clayton L. Holstun ,  Kelly Ronk ,  James A. Feinn

    IPC: B41J2/045 ,  B41J2/155

    Abstract: According to an example, in a method for enhancing temperature distribution uniformity across a printer die, in which the printer die includes a plurality of drop generators arranged in a plurality of columns, a warming map that identifies the drop generators of the plurality of drop generators that are to be supplied with warming pulses to enhance temperature distribution uniformity across the printer die may be accessed. The warming map may identify a non-uniform distribution of the drop generators across a column of the plurality of columns. In addition, the warming map may be implemented to supply the drop generators identified in the warming map as the drop generators that are to receive the warming pulses.

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