公开(公告)号：US10562300B2

公开(公告)日：2020-02-18

申请号：US16097527

申请日：2016-07-19

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

Inventor： Diana Canto Estany ,  Lawrence H White ,  Macia Sole Pons

IPC: B41J2/045 ,  B41J2/14 ,  B41J29/38

Abstract: Thermal inkjet printing wherein a printhead has ink ejection elements which are energizable by electrical pulses of a given energy with fire pulses of an amplitude (V) and a fire pulse width (fp). A printer controller sends commands to the printhead to spit ink drops, one or more temperature sensors coupled to the printhead measure a temperature of the printhead, and a calibration component coupled to the temperature sensor variably adjusts the fire pulse energy provided to the having ink ejection elements of the printhead. The calibration component initiates calibrating the printhead, spitting a number (X) of ink drops at a frequency (Y) by the electrical pulses, reading and storing printhead temperature, varying the fire pulse energy by repeating spitting ink drops and reading and storing printhead temperature, finding minimum temperature from the stored printhead temperatures, and deriving an operational fire pulse (fpop) from a fire pulse (fpon) that has produced the minimum temperature, wherein the printer controller uses the operational fire pulse (fpop) for printing.

公开(公告)号：US20190389203A1

公开(公告)日：2019-12-26

申请号：US16481506

申请日：2017-05-03

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

Inventor： Marta Blanch Pinol ,  Diana Canto Estany ,  Eduardo Amela Conesa

IPC: B41J2/045 ,  B41J2/21

Abstract: In an example, a print system identifies a number of drops to eject corresponding to an expected variation in print fluid based on media temperature and generate print instructions to operate a fluid eject device to that effect. In another example, a print system includes a temperature engine to identify a temperature, a compensator engine to identify a number of drops of print fluid based on the media temperature, and a control engine to generate print instructions to operate a fluid ejection device to place the number of drops of print fluid on media.

公开(公告)号：US20190126616A1

公开(公告)日：2019-05-02

申请号：US16097527

申请日：2016-07-19

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

Inventor： Diana Canto Estany ,  Lawrence H White ,  Macia Sole Pons

IPC: B41J2/045 ,  B41J2/14

Abstract: Thermal inkjet printing wherein a printhead has ink ejection elements which are energizable by electrical pulses of a given energy with fire pulses of an amplitude (V) and a fire pulse width (fp). A printer controller sends commands to the printhead to spit ink drops, one or more temperature sensors coupled to the printhead measure a temperature of the printhead, and a calibration component coupled to the temperature sensor variably adjusts the fire pulse energy provided to the having ink ejection elements of the printhead. The calibration component initiates calibrating the printhead, spitting a number (X) of ink drops at a frequency (Y) by the electrical pulses, reading and storing printhead temperature, varying the fire pulse energy by repeating spitting ink drops and reading and storing printhead temperature, finding minimum temperature from the stored printhead temperatures, and deriving an operational fire pulse (fpop) from a fire pulse (fpon) that has produced the minimum temperature, wherein the printer controller uses the operational fire pulse (fpop) for printing.