公开(公告)号：US20250058563A1

公开(公告)日：2025-02-20

申请号：US18720579

申请日：2021-12-20

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

Inventor： Jacob Lum ,  James R. Przybyla

IPC: B41J2/14 ,  B41J2/15

Abstract: A fluid-ejection printhead includes a sparse array of fluid-ejection nozzles through which fluid is ejected onto dot rows parallel to a scan axis of the fluidejection printhead. The fluid is ejected by more than one fluid-ejection nozzle of the sparse array onto each dot row. The fluid-ejection printhead includes fluidejection element. Each element can correspond to a pair of the fluid-ejection nozzles through which the fluid is ejected onto a same dot row and include a corresponding pair of fluid-ejection actuators. Each element can instead correspond to one of the fluid-ejection nozzles and include one fluid-ejection actuator.

公开(公告)号：US20230047150A1

公开(公告)日：2023-02-16

申请号：US17794386

申请日：2020-01-22

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

Inventor： Jacob Lum

IPC: B41J2/18

Abstract: A backside channel is fluidically connected between a supply inlet and a backside outlet. The backside channel has a backside channel fluid recirculation path. An element channel is fluidically connected to an element outlet. Fluid-ejection elements are fluidically connected between the backside channel and the element channel. The fluid-ejection elements have a fluid-ejection element fluid recirculation path.

公开(公告)号：US20230025124A1

公开(公告)日：2023-01-26

申请号：US17781535

申请日：2019-12-06

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

Inventor： Jacob Lum ,  James A Feinn ,  Mengqian Lu

IPC: B41J2/18 ,  B41J2/175

Abstract: An example recirculation fluid ejection device includes a first unit droplet generator including a first actuator and a first nozzle between a first and a second fluid feed hole, the first fluid feed hole located on a first channel and the second fluid feed hole and a first pump located on a second channel. The example device includes a second unit droplet generator including a second actuator and a second nozzle between a third and a fourth fluid feed hole, the third feed hole located on a third channel and the fourth fluid feed hole and a second pump located on a fourth channel. The first and the second actuators eject fluid at substantially the same backpressure. A first pressure measurable at an inlet of the first channel and the third channel are different from a second pressure measurable at an outlet of the second channel and the fourth channel.

公开(公告)号：US20220379607A1

公开(公告)日：2022-12-01

申请号：US17775934

申请日：2019-12-10

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

Inventor： Jacob Lum ,  James A. Feinn ,  Mengqian Lu ,  Garrett E. Clark

IPC: B41J2/14

Abstract: An example printhead includes a set of circulation channels for flowing a fluid therethrough, the set of nozzles including higher-pressure channels and lower-pressure channels; a first nozzle array having a first nozzle; a second nozzle array having a second nozzle, the first nozzle and the second nozzle forming a row region; a first inter-channel passage fluidically coupling the first nozzle to a first pair of adjacent circulation channels, the first pair including a higher-pressure channel on a first side of a lower-pressure channel; and a second inter-channel passage fluidically coupling the second nozzle to a second pair of adjacent circulation channels, the second pair including a higher-pressure channel on a second side of a lower-pressure channel, the second side being opposite the first side.

公开(公告)号：US11325385B2

公开(公告)日：2022-05-10

申请号：US16640563

申请日：2017-10-19

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

Inventor： Jacob Lum ,  Jeremy Sells ,  Si-lam Choy

IPC: B41J2/05 ,  B41J2/175 ,  B41J2/14 ,  B41J2/045

Abstract: A fluidic die may include a fluid channel layer defining a number of fluid channels therein, a slot layer disposed on a side of the fluid channel layer, and a first fluid slot and a second fluid slot defined in the slot layer. At least one of the fluid channels fluidically couples the first fluid slot to the second fluid slot. The first fluid slot and the second fluid slot are defined in the slot layer along a length of the fluidic die.

公开(公告)号：US20210114032A1

公开(公告)日：2021-04-22

申请号：US17044404

申请日：2018-04-23

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

Inventor： Garrett E. Clark ,  Si-lam Choy ,  Jacob Lum ,  Craig Olbrich ,  Jeremy Sells ,  Tsuyoshi Yamashita

IPC: B01L3/00

Abstract: A fluidic die may include a at least one actuator, and fluid flow architecture to flow a first fluid through at least one fluidic channel, and flow a second fluid through the at least one fluidic channel to form a laminar flow between the first fluid and the actuator. The at least one actuator forms a drive bubble from the second fluid to cause the first fluid to be ejected from the fluidic die.

公开(公告)号：US20200238708A1

公开(公告)日：2020-07-30

申请号：US16640563

申请日：2017-10-19

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

Inventor： Jacob Lum ,  Jeremy Sells ,  Si-lam Choy

IPC: B41J2/175 ,  B41J2/14

Abstract: A fluidic die may include a fluid channel layer defining a number of fluid channels therein, a slot layer disposed on a side of the fluid channel layer, and a first fluid slot and a second fluid slot defined in the slot layer. At least one of the fluid channels fluidically couples the first fluid slot to the second fluid slot. The first fluid slot and the second fluid slot are defined in the slot layer along a length of the fluidic die.

公开(公告)号：US11987055B2

公开(公告)日：2024-05-21

申请号：US17667463

申请日：2022-02-08

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

Inventor： Jacob Lum ,  Jeremy Sells ,  Si-lam Choy

IPC: B41J2/175 ,  B41J2/14 ,  B41J2/045

CPC classification number: B41J2/175 ,  B41J2/1404 ,  B41J2/0458 ,  B41J2/14145 ,  B41J2002/14403 ,  B41J2002/14467 ,  B41J2202/12

Abstract: A fluidic die may include a fluid channel layer defining a number of fluid channels therein, a slot layer disposed on a side of the fluid channel layer, and a first fluid slot and a second fluid slot defined in the slot layer. At least one of the fluid channels fluidically couples the first fluid slot to the second fluid slot. The first fluid slot and the second fluid slot are defined in the slot layer along a length of the fluidic die.

公开(公告)号：US11970011B2

公开(公告)日：2024-04-30

申请号：US17799420

申请日：2020-03-05

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

Inventor： Jacob Lum ,  Alexander Govyadinov

IPC: B41J2/18 ,  B41J2/14 ,  B41J2/05

CPC classification number: B41J2/18 ,  B41J2/1404 ,  B41J2/14112 ,  B41J2/05 ,  B41J2202/12

Abstract: A fluid-ejection element of a fluid-ejection device includes a chamber layer having a pair of chambers fluidically disconnected from one another within the chamber layer. The fluid-ejection element includes a tophat layer over the chamber layer and fluidically connecting the chambers to define a fluid recirculation path between the chambers. The fluid-ejection element includes a nozzle common to both the chambers.

公开(公告)号：US11970010B2

公开(公告)日：2024-04-30

申请号：US17772760

申请日：2019-11-13

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

Inventor： Jacob Lum ,  James A. Feinn ,  Mengqian Lu ,  Garrett E. Clark

IPC: B41J2/18

CPC classification number: B41J2/18

Abstract: An example printhead includes a circulation channel having an inlet for receiving a fluid and an outlet for expelling the fluid, a first nozzle fluidically coupled to the circulation channel, the first nozzle being operable at a first absolute pressure, and a second nozzle fluidically coupled to the circulation channel, the second nozzle being operable at a second absolute pressure, the absolute second pressure being lower than the first absolute pressure. The absolute pressure in the circulation channel decreases as the fluid flows from the inlet to the outlet, and the first nozzle is positioned closer to the inlet of the circulation channel than the second nozzle.