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    FLUIDIC DIE WITH DROP WEIGHT SIGNALS
    31.
    发明申请
    FLUIDIC DIE WITH DROP WEIGHT SIGNALS 审中-公开

    公开(公告)号：US20200055309A1

    公开(公告)日：2020-02-20

    申请号：US16485218

    申请日：2017-04-14

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

    Inventor： Eric Martin ,  Daryl E Anderson

    IPC: B41J2/045

    Abstract: A fluidic die includes an array of nozzles, each nozzle to eject a fluid drop in response to a corresponding actuation signal having an actuation value. Nozzle select logic provides for each nozzle a nozzle select signal having a select value or a non-select value. Actuation logic provides the respective actuation signal for each nozzle, the actuation logic to receive one or more drop weight signals, and for each nozzle select signal having the select value, to provide an actuation signal having an actuation value to the corresponding nozzle and/or to one or more neighboring nozzles based on a state of the one or more drop weight signals.

    Printing device
    33.
    发明授权
    Printing device 有权

    公开(公告)号：US10086604B2

    公开(公告)日：2018-10-02

    申请号：US15516389

    申请日：2014-10-27

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

    Inventor： James Gardner ,  Daryl E Anderson ,  Eric T Martin

    IPC: B41J2/045

    Abstract: A method of operating a printing device during a power loss event includes, with a power loss detection device, detecting an power loss to a number of high voltage devices. The method further includes, with a voltage regulator coupled to printhead fire control circuitry, maintaining a power loss protection supply voltage (VDD_plp) to the printhead fire control circuitry.

    PRINT MATERIAL LEVEL SENSING
    37.
    发明申请
    PRINT MATERIAL LEVEL SENSING 有权

    公开(公告)号：US20220009243A1

    公开(公告)日：2022-01-13

    申请号：US16769044

    申请日：2019-04-05

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

    Inventor： Evan Clay Dagg ,  Daryl E Anderson ,  James Michael Gardner

    IPC: B41J2/175 ,  G01F25/00 ,  G01F23/24

    Abstract: A print material level sensor comprises a series of print material level sensing devices disposed at intervals to detect presence of a print material at successive depth zones in a container, wherein each print material level sensing device includes a heater to emit heat at its depth zone and a sensor to sense heat at the depth zone and to output a signal based on the heat sensed. The sensor has control circuitry to, for each print material level sensing device to be calibrated, turn on the heater for an initial time duration set by an initial heat count and iteratively adjust the time duration for which the heater is turned on in accordance with an adjusted heat count, until the signal output from the sensor indicates that a target value has been reached in that depth zone.

    DELAY ELEMENTS FOR ACTIVATION SIGNALS
    39.
    发明申请
    DELAY ELEMENTS FOR ACTIVATION SIGNALS 有权

    公开(公告)号：US20210276324A1

    公开(公告)日：2021-09-09

    申请号：US16482793

    申请日：2017-04-14

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

    Inventor： Eric Martin ,  Daryl E Anderson

    IPC: B41J2/045

    Abstract: In some examples, a fluidic die includes a set of fluid actuators arranged in an order, and a controller to determine, based on input control information relating to controlling actuation of the plurality of fluid actuators, whether a first fluid actuator of the plurality of fluid actuators is to be actuated and whether a second fluid actuator within a specified proximity of the first fluid actuator in the order is to be actuated, and in response to determining that the first fluid actuator is to be actuated and the second fluid actuator within the specified proximity of the first fluid actuator in the order is not to be actuated, activate a delay element associated with the first fluid actuator, the delay element to delay an activation signal propagated to selected fluid actuators of the set of fluid actuators in response to an actuation event.

    CURRENT LEAKAGE TEST OF A FLUID EJECTION DIE
    40.
    发明申请
    CURRENT LEAKAGE TEST OF A FLUID EJECTION DIE 有权

    公开(公告)号：US20210276321A1

    公开(公告)日：2021-09-09

    申请号：US16317891

    申请日：2016-10-24

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

    Inventor： Daryl E Anderson ,  Eric Martin ,  James Michael Gardner ,  Rogelio Cicili

    IPC: B41J2/045

    Abstract: Example implementations relate to current leakage testing of a fluid ejection die. For example, a fluid ejection die may include plurality of nozzles, each nozzle among the plurality of nozzles including a nozzle sensor and a fluid ejector. The plurality of nozzle sensors may comprise a first subset and a second subset, each nozzle sensor among the plurality of nozzle sensors of the first subset may be electrically coupled to a first control line by a respective switch among a first group of switches, and each nozzle sensor among the plurality of nozzle sensors of the second subset may be electrically coupled to a second control line by a respective switch among a second group of switches. The fluid ejection die may include a control circuit to perform a current leakage test of the plurality of nozzles using the first control line and the second control line.

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