Printheads

Patent metadata

Field	Value
Publication number	US-11220107-B2
Application number	US-201615772313-A
Country	US
Kind code	B2
Filing date	Feb 5, 2016
Priority date	Feb 5, 2016
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

The present disclosure includes a description of an example printhead having multiple ejection dies. The ejection dies are coupled to a temperature sensor and send temperature signals to a controller. The printhead can also include a heater coupled to the ejection dies to apply heat to at least one ejection die.

First claim

What is claimed is:

1. A printer system comprising:
a controller including a circuit;
a printhead including:
a plurality of ejection dies that each include a plurality of thermal ejection mechanisms that eject printing material responsive to ejection control signals;
a temperature sensor coupled to the plurality of ejection dies to send temperature signals to the controller; and
a heater coupled to the plurality of ejection dies to apply heat to at least one ejection die in the plurality of ejection dies based on heater control signals from the controller without causing the thermal ejection mechanisms to eject the printing material; and

a density measurement component, including a sensor, to detect density of the printing material deposited on a print media by the printhead and to provide feedback data indicative of the detected density and variation in density to the controller, the controller to:
provide the heater control signals to the heater; and
adjust the heat that the heater applies to the at least one ejection die based on the density detected by the density measurement component and based on the temperature signals sent by the temperature sensor, by modifying the heater control signals, to compensate for changes in the at least one ejection die.

2. The printer system of claim 1 wherein the heater applies heat to the at least one ejection die based on the heater control signals received from the controller in response to the temperature signals.

3. The printer system of claim 1 wherein the ejection dies are associated with corresponding performance profiles comprising temperature based settings, the performance profiles including performance characteristics resulting from different temperatures of the ejection dies.

4. The printer system of claim 1 wherein the plurality of ejection dies is one group of ejection dies and a plurality of ejection dies included in the printhead.

5. The printer system of claim 1 further comprising a memory having a print performance profile associated with the plurality of ejection dies, wherein the temperature sensor is to monitor temperatures associated with each of the plurality of ejection dies and the controller is to provide the heater control signals to the heater to adjust a first temperature of the at least one ejection die based on a second temperature of a neighboring ejection die of the plurality of ejection dies.

6. The printer system of claim 1 , further comprising a drying component to remove excess moisture or solvent from a printed image generated by the printhead and to provide feedback data to the controller, and the controller is to monitor the temperature sensor in response to the feedback data being indicative of the drying component being operational and generating heat.

7. The printer system of claim 1 , further comprising a curing component to fix or cure the printing material applied by the printhead and to provide feedback data to the controller, and the control is to monitor the temperature sensor in response to the feedback data being indicative of the curing component being operational and generating heat.

8. The printer system of claim 1 , further comprising a media feed component, and to provide data to the controller indicative of a current state of the media feed component, and the control is to monitor the temperature sensor based on the current state.

9. A printer system comprising:
a controller to generate heater control signals and ejection control signals, the controller including a circuit;
a plurality of printheads coupled to the controller, each printhead comprising:
an ejection die including a plurality of thermal ejection mechanisms to eject printing material in response to the ejection control signals received from the controller;
a temperature sensor to send temperature data to the controller, the temperature data being indicative of a temperature associated with the ejection die; and
a heater to apply heat to the ejection die in accordance with the heater control signals received from the controller based on the temperature data without causing the thermal ejection mechanisms to eject the printing material; and
a density measurement component, including a sensor, to detect density of printing material deposited on a print media by the plurality of printheads and to provide data indicative of the detected density to the controller, the controller to modify the heater control signals to adjust the heat that the heater applies to the ejection die based on the detected density and the temperature data.

10. The printer system of claim 9 further comprising additional printer components to perform corresponding functions and to send status data to the controller, and wherein the heater control signals generated by the controller are further based on the status data, and the controller is to monitor the temperature sensors in response to the status data being indicative of the additional printer components being operational and generating heat.

11. The printer system of claim 9 wherein the ejection die comprises a plurality of ejection dies, and the temperature sensor is to monitor and send temperature data to the controller, the temperature data being indicative of different temperatures associated with respective ones of the plurality of ejection dies.

12. The printer system of claim 9 wherein the temperature sensor measures the temperature of the ejection die and the temperature data is based on the measures, and the heater of each printhead is to adjust the temperature of the respective ejection die in response to the heater control signals.

13. The printer system of claim 9 wherein each printhead is to store a temperature performance profile associated with the printhead, and wherein the controller is to correlate the detected density with the temperature data from the temperature sensor and to send the heater control signals to adjust the temperature of the ejection die and to adjust a performance characteristic associated with the ejection die based on the detected density, the performance characteristic including a dot size, a print weight, and a combination thereof.

14. A method comprising:
receiving temperature data from a printhead having a plurality of ejection dies that each include a plurality of thermal ejection mechanisms that eject printing material responsive to ejection control signals;
generating heater control signals based on the temperature data to control heaters on the printhead that heat the ejection dies without causing the thermal ejection mechanisms to eject the printing material;
receiving print density measurement data from a density measurement component, including a sensor, the print density measurement data being indicative of variations in density of material printed by respective ones of the ejection dies; and
adjusting the heat that the heaters apply to the ejection dies based on the print density measurement data received from the density measurement component, by modifying the heater control signals, to compensate for changes in the ejection dies.

15. The method of claim 14 , wherein the temperature data comprises data corresponding to a temperature of an ejection die on the printhead, and the method further includes adjusting, by the heaters, a temperature associated with the printhead in response to the heater control signals.

16. The method of claim 14 , further comprising receiving status data from another printer component, and wherein the heater control signals are further based on the status data.

17. The method of claim 14 , wherein the

Assignees

• Hewlett Packard Development Co

Inventors

• Clark Garrett E
• Cumbie Michael W
• Mackenzie Mark H

Classifications

• B41J2202/20

  Modules · CPC title

• B41J2/14201 Primary

  Structure of print heads with piezoelectric elements · CPC title

• B41J2202/08

  dealing with thermal variations, e.g. cooling · CPC title

• B41J2/04581

  controlling heads based on piezoelectric elements · CPC title

• B41J2/1408

  Structure dealing with thermal variations, e.g. cooling device, thermal coefficients of materials · CPC title