公开(公告)号：US20240140086A1

公开(公告)日：2024-05-02

申请号：US17977559

申请日：2022-10-31

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

Inventor： Jason Hower ,  James R PRZYBYLA ,  Vincent KORTHUIS ,  Eric MARTIN

IPC: B41J2/045

CPC classification number: B41J2/04508 ,  B41J2/04586

Abstract: According to an example, a method for performing maintenance routines in a plurality of actuators comprises firing a set of actuators at different energies, determining turn on energy values for the set of actuators based on measurements measured via chamber sensors associated with the set of actuators at the different energies, determining turn on energy differences for the set of actuators based on the turn on energy values determined for the set of actuators and threshold turn on energy values associated with the set of actuators, and performing maintenance routines corresponding to the determined turn on energy differences.

公开(公告)号：US20190255837A1

公开(公告)日：2019-08-22

申请号：US16317883

申请日：2016-10-24

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

Inventor： Daryl E ANDERSON ,  Eric MARTIN ,  James Michael GARDNER

IPC: B41J2/045 ,  B41J2/14

Abstract: Example implementations relate to low voltage bias of nozzle sensors. For example, a fluid ejection die according to the present disclosure may include a plurality of nozzles, and each nozzle may include a nozzle sensor and a fluid ejector, among other components. The fluid ejection die may also include a voltage reduction device to maintain a low voltage bias on the plurality of nozzle sensors during an operation of the plurality of nozzles. A plurality of sense circuits may be electrically coupled to a respective nozzle sensor among the plurality of nozzle sensors, and each sense circuit may evaluate a status of the respective nozzle after the operation.

公开(公告)号：US20200171814A1

公开(公告)日：2020-06-04

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

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：US20190210361A1

公开(公告)日：2019-07-11

申请号：US16306611

申请日：2016-10-03

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

Inventor： Eric MARTIN ,  Vincent C. KORTHUIS

IPC: B41J2/045 ,  B41J2/18

CPC classification number: B41J2/04541 ,  B41J2/0458 ,  B41J2/04586 ,  B41J2/18 ,  B41J2202/12

Abstract: In some examples, a fluid ejection device includes a nozzle to dispense fluid, and a recirculation controller to control recirculating of the nozzle. The recirculation controller is to receive, from a fluid ejection controller, an indication corresponding to a start of a sampling time interval, determine, during the sampling time interval, whether a firing event corresponding to firing of the nozzle has occurred, and in response to determining that the firing event has not occurred, cause activation of a recirculation pump to recirculate fluid through a chamber of the nozzle.