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：US20170305150A1

公开(公告)日：2017-10-26

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

CPC classification number: B41J2/04541 ,  B41J2/04548 ,  B41J2/0458 ,  B41J29/393

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.