公开(公告)号：US11945225B2

公开(公告)日：2024-04-02

申请号：US17778359

申请日：2019-11-22

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

Inventor： Sara Echevarria Benito ,  Ruben Recasens Oros ,  Alexandre Rodriguez Llofriu

IPC: B41J2/21 ,  B41J2/17 ,  H04N1/405

CPC classification number: B41J2/17 ,  B41J2/2114 ,  H04N1/405

Abstract: A method is disclosed. The method comprises receiving a matrix representation of a source image to be printed, the matrix representation defining a colorant value for each of a plurality of print addressable locations, wherein the colorant values are representative of amounts of print colorant to be delivered to the print addressable locations during a printing operation. The method may comprise identifying, by processing circuitry, a region in the matrix representation having a first print addressable location and an adjacent second print addressable location, wherein a difference between colorant values of the first print addressable location and the second print addressable location meets or exceeds a defined colorant value threshold. The method may comprise determining, by processing circuitry, an amount of treatment fluid to be delivered to each of the plurality of print addressable locations during the printing operation, wherein an amount of treatment fluid to be delivered in the identified region is determined to be greater than an amount of treatment fluid to be delivered to adjacent print addressable locations having colorant values which differ by less than the defined colorant value threshold. An apparatus and a machine-readable medium are also disclosed.

公开(公告)号：US20220143973A1

公开(公告)日：2022-05-12

申请号：US17418961

申请日：2019-07-24

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

Inventor： Alexandre Rodriguez Llofriu ,  Diana Canto Estany ,  Eduardo Amela Conesa

IPC: B41J2/045 ,  B41J2/18 ,  B41J2/14

Abstract: Example implementations relate to controllers and printers to operate at least one liquid ejection device of a printhead; the liquid ejection device comprising a nozzle and an associated print liquid chamber bearing a transducer to eject print liquid from the nozzle in response to a firing signal; the print chamber being fluidically coupled to a nozzle supply channel; the at least one liquid ejection device comprising a channel coupled to the print liquid chamber and the nozzle supply channel; the channel having a respective actuator to urge print liquid through the print chamber in response to a circulation signal; wherein the controller comprises temperature control circuitry to actuate the respective actuator using a temperature control signal to increase the temperature of print liquid in the print liquid chamber.

公开(公告)号：US20230022827A1

公开(公告)日：2023-01-26

申请号：US17381907

申请日：2021-07-21

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

Inventor： Bartomeu Gaya Pol ,  Alexandre Rodriguez Llofriu ,  Alejandro Alarcon Cano

IPC: B41J11/46 ,  B41J11/00 ,  B41J3/36 ,  B41J3/407 ,  B41J19/20 ,  B41J29/38

Abstract: A printer for direct printing on a print substrate comprises a front support supporting a printing device; the front support to be arranged at a front side of a print substrate and to be aligned relative to a rear support across the print substrate in a contact-less manner.