公开(公告)号：US20210347169A1

公开(公告)日：2021-11-11

申请号：US17251967

申请日：2019-01-31

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

Inventor： James R. Przybyla ,  Eric Martin ,  Daryl E. Anderson ,  Chien-Hua Chen

IPC: B41J2/14 ,  B41J2/16

Abstract: One example provides a fluidic device including a substrate, a nozzle layer disposed on the substrate, the nozzle layer having an upper surface opposite the substrate including a plurality of nozzles formed therein, each nozzle including a fluid chamber and a nozzle orifice extending through the nozzle layer from the upper surface to the fluid chamber. A number of conductive traces are disposed in direct contact with the nozzle layer to provide electrical pathways above the substrate.

公开(公告)号：US20210316551A1

公开(公告)日：2021-10-14

申请号：US17267542

申请日：2018-11-21

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

Inventor： Eric Martin ,  James R. Pryzbyla ,  Daryl E. Anderson

IPC: B41J2/045 ,  B41J2/14

Abstract: In one example in accordance with the present disclosure, a fluidic die is described. The fluidic die includes an array of firing subassemblies grouped into zones. Each firing subassembly includes 1) a firing chamber, 2) a fluid actuator, and 3) a sensor plate. The fluidic die also includes a measurement device per zone to measure a voltage indicative of an impedance within a selected firing chamber. The fluidic die includes a selector per firing subassembly to couple a selected sensor plate to the measurement device. A selector is adjacent a respective firing subassembly and a distance between the selector and the measurement device is different as compared to other selectors.

公开(公告)号：US20210237059A1

公开(公告)日：2021-08-05

申请号：US17049302

申请日：2018-08-09

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

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

IPC: B01L3/00

Abstract: A microfluidic device may include a fluid channel defined in a substrate, an impedance sensor positioned within the fluid channel, and control logic. The control logic may force a current into the impedance sensor to sense an impedance at the location of the impedance sensor, the sensed impedance defining whether the fluid within the fluid channel is at the location of the impedance sensor, and instruct a pump device to apply a back pressure on the fluid to maintain the fluid upstream from the impedance sensor in response to a determination that the sensed impedance indicates that the fluid is located at the location of the impedance sensor.

公开(公告)号：US11040545B2

公开(公告)日：2021-06-22

申请号：US16094549

申请日：2016-07-14

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

Inventor： Daryl E. Anderson ,  James Michael Gardner

IPC: B41J2/175 ,  G01F23/00 ,  G01F23/22 ,  G01F25/00

Abstract: In one example a fluid level sensing device is described. The device includes a sensing die having a number of fluid level sensors disposed thereon and a number of control devices, each control device corresponding to one of the number of fluid level sensors. A control device includes a comparing device to determine a state of a corresponding fluid level sensor. A state of the fluid level sensor is selected from the group consisting of a fluid state and a no fluid state. Each control device also includes a non-volatile memory device corresponding to the comparing device to indicate whether the corresponding fluid level sensor is at the fluid state or the no fluid state. A control device also includes a locking device to receive a write command and to irreversibly set the non-volatile memory device to the no fluid state based on the write command.

公开(公告)号：US20210178385A1

公开(公告)日：2021-06-17

申请号：US17268394

申请日：2018-11-26

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

Inventor： Daryl E. Anderson ,  George H. Corrigan III ,  Alexander Govyadinov

IPC: B01L3/00 ,  C12Q1/686 ,  B01L7/00

Abstract: In one example in accordance with the present disclosure, a microfluidic device is described. The microfluidic device includes a reservoir to contain a first thermally expandable fluid, a first heater to heat the thermally expandable fluid in the reservoir, a channel extending from the reservoir and connected to the reservoir at a first opening, and a liquid volume obstructing the channel.

公开(公告)号：US11020960B2

公开(公告)日：2021-06-01

申请号：US16615191

申请日：2017-06-30

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

Inventor： Eric Martin ,  Daryl E. Anderson

IPC: B41J2/045 ,  B41J2/165 ,  B41J2/14

Abstract: In one example, a fault-tolerant printhead includes an array of fluid actuators. Each fluid actuator includes a fault sensor to detect a faulted fluid actuator and a per-fluid actuator memory to store a fault sensor state of the fluid actuator. The fault-tolerant printhead also includes an interface to read a state of each per-fluid actuator memory.

公开(公告)号：US20210114388A1

公开(公告)日：2021-04-22

申请号：US16955884

申请日：2018-03-05

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

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

IPC: B41J29/46 ,  B41J2/045 ,  G01R17/02 ,  G01R31/58

Abstract: In one example in accordance with the present disclosure, a fluidic die is described. The fluidic die includes an array of fluid actuators. Wires are disposed at various points along at least one of a supply bus and a return bus that are coupled to the actuators in the array. The wires output a voltage level at a corresponding point of the respective bus. At least one comparator compares a voltage of a selected wire against a voltage threshold. At least one fault capture device to output a signal indicating a fault based on the output of the at least one comparator.

公开(公告)号：US20210078332A1

公开(公告)日：2021-03-18

申请号：US16970491

申请日：2018-04-12

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

Inventor： Daryl E. Anderson ,  Eric Martin ,  James Michael Gardner ,  Pere Esterri Pedra

IPC: B41J2/165 ,  B33Y30/00 ,  B33Y40/00 ,  B33Y50/02 ,  B29C64/209 ,  B29C64/35 ,  B29C64/393

Abstract: A fluidic die may include a fluidic channel, and an electrode disposed within a fluidic channel of the fluidic die to determine if a difference between an initially-measured impedance and a subsequently-measured impedance as measured by the electrode indicates a completion of a purging of an initial fluid from the fluidic die and a replacement with a second fluid.

公开(公告)号：US10940694B2

公开(公告)日：2021-03-09

申请号：US16094113

申请日：2016-04-29

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

Inventor： Daryl E. Anderson ,  Michael W. Cumbie ,  James Michael Gardner ,  Berkeley Fisher

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

Abstract: An example printing cartridge includes a sensing die including a plurality of sensing locations in thermal contact with a fluid container, an on-die controller to select a sensing location of the plurality of sensing locations to activate and to provide a variable threshold voltage, and a voltage comparator to compare a sensed voltage generated at a selected sensing location to the variable threshold voltage, and output time-based information based on the comparison, the time-based information representative of whether a fluid is present at a fluid level associated with the selected sensing location.

公开(公告)号：US20200039215A1

公开(公告)日：2020-02-06

申请号：US16484720

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 plurality of fluid actuators, 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 in response to determining that the first fluid actuator is 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 plurality of fluid actuators in response to an actuation event.