公开(公告)号：US20200033203A1

公开(公告)日：2020-01-30

申请号：US16490975

申请日：2017-04-24

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

Inventor： Daryl E Anderson ,  James Gardner ,  Berkeley Fisher

IPC: G01L1/16 ,  B41J2/045 ,  B41J2/165

Abstract: A fluid ejection die includes a plurality of nozzles to eject fluid drops and a plurality of strain gauge sensors to sense strain. Each strain gauge sensor corresponds to a nozzle and passes the sensed strain to a controller to determine the health of the nozzle based on the sensed strain.

公开(公告)号：US20200031127A1

公开(公告)日：2020-01-30

申请号：US16490838

申请日：2017-04-24

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

Inventor： James Gardner ,  Berkeley Fisher ,  Andrew Koll

IPC: B41J2/14

Abstract: A fluid ejection system includes a fluid ejection die and a controller. The fluid ejection die includes a plurality of nozzles to eject fluid drops and a plurality of strain gauge sensors to sense strain within the fluid ejection die. The controller is to receive the sensed strain from each strain gauge sensor to determine a status of the fluid ejection die.

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.