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    Fluid ejection via different field-effect transistors
    21.
    发明授权
    Fluid ejection via different field-effect transistors 有权

    公开(公告)号：US10589521B2

    公开(公告)日：2020-03-17

    申请号：US16307072

    申请日：2016-10-05

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

    Inventor： Rogelio Cicili ,  Eric Martin

    IPC: B41J2/045 ,  B41J2/14

    Abstract: In one example in accordance with the present disclosure, a fluid ejection device is described. The fluid ejection device includes a number of nozzles to eject an amount of fluid. A first field-effect transistor (FET) activates a first fluidic operation component and a second FET activates a second fluidic operation component. The first FET and the second FET are selected from among a high-side switch FET, a low-side switch FET, and a hybrid FET and the first FET and the second FET are different from one another.

    MONITORING CIRCUITRY INCLUDING LEVEL SHIFTERS AND ANALOG PASS GATES
    25.
    发明申请
    MONITORING CIRCUITRY INCLUDING LEVEL SHIFTERS AND ANALOG PASS GATES 有权

    公开(公告)号：US20230085502A1

    公开(公告)日：2023-03-16

    申请号：US17799707

    申请日：2020-03-06

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

    Inventor： Eric T. Martin ,  Rogelio Cicili

    IPC: B41J2/045

    Abstract: According to examples, an apparatus may include fluid chambers that each includes a fluid actuator and an electrode. The fluid actuators may operate at a first voltage level and a monitoring circuitry may operate at a second voltage level that is lower than the first voltage level. The monitoring circuitry may monitor a condition of each fluid chamber based on a selection signal for selecting an electrode associated with a fluid chamber. The monitoring circuitry including an analog multiplexer that includes, for each of the electrodes for the plurality of fluid chambers, a level shifter to receive the selection signal at the second voltage level and to shift a level of the selection signal. The analog multiplexer may also include an analog pass gate to selectively couple the electrode of a respective fluid chamber to the monitoring circuitry based on the level shifted selection signal.

    PRINTHEAD HIGH SIDE SWITCH CONTROLS
    27.
    发明申请
    PRINTHEAD HIGH SIDE SWITCH CONTROLS 有权

    公开(公告)号：US20220097360A1

    公开(公告)日：2022-03-31

    申请号：US17311430

    申请日：2019-06-19

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

    Inventor： Eric Thomas Martin ,  Rogelio Cicili

    IPC: B41J2/045

    Abstract: In example implementations, an apparatus is provided. The apparatus includes a power supply, a first switch coupled to the power supply, a second switch coupled to the first switch, a third switch coupled to the power supply, the first switch, and the second switch, and a resistor coupled to the third switch. The first switch is to be controlled via a high voltage logic. The second switch is to be controlled via a low voltage logic. The resistor is to generate heat when energized. The first switch and the second switch are to control activation of the third switch to energize the resistor and cause a nozzle chamber to dispense a printing fluid.

    Current leakage test of a fluid ejection die
    28.
    发明授权
    Current leakage test of a fluid ejection die 有权

    公开(公告)号：US11186081B2

    公开(公告)日：2021-11-30

    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.

    TEMPERATURE SENSING
    29.
    发明申请
    TEMPERATURE SENSING 有权

    公开(公告)号：US20210323301A1

    公开(公告)日：2021-10-21

    申请号：US17251241

    申请日：2018-11-16

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

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

    IPC: B41J2/045 ,  G01K7/16 ,  G01K1/024 ,  B41J2/05

    Abstract: Examples of a fluidic die for temperature sensing are described herein. In some examples, the fluidic die includes a plurality of resistor segments connected in series. In some examples, the fluidic die may include a plurality of first switches connected to a first side of each of the plurality of resistor segments. In some examples, the fluidic die includes a plurality of second switches connected to a second side of each of the plurality of resistor segments. In some examples, the fluidic die includes a differential amplifier to output a temperature voltage signal, where a first input of the differential amplifier is each of the first switches, and where a second input of the differential amplifier is connected each of the plurality of second switches.

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