Fluid ejection apparatus with single-side thermal sensor

Patent metadata

Field	Value
Publication number	US-9796178-B2
Application number	US-201715486602-A
Country	US
Kind code	B2
Filing date	Apr 13, 2017
Priority date	Nov 26, 2013
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

An example provides a fluid ejection apparatus including a fluid feed slot to supply a fluid to a plurality of drop ejectors, a first rib at a first side of the fluid feed slot and supporting drop ejection circuitry to control ejection of drops of the fluid from the plurality of drop ejectors, and a second rib at a second side, opposite the first side, of the fluid feed slot supporting a thermal sensor to facilitate determination of a temperature of the first rib and the second rib.

First claim

What is claimed is:

1. A fluid ejection printhead comprising:
a fluid feed slot to supply a fluid to a plurality of drop ejectors;
a first rib at a first side of the fluid feed slot and supporting drop ejection circuitry to control ejection of drops of the fluid from the plurality of drop ejectors; and
a second rib at a second side, opposite the first side, of the fluid feed slot and supporting a thermal sensor to facilitate determination of a temperature of the first rib;
wherein the fluid feed slot is disposed between the first rib and the second rib; and
wherein the thermal sensor comprises a thermal sense resistor.

2. The fluid ejection printhead of claim 1 , wherein the first rib is wider than the second rib.

3. The fluid ejection printhead of claim 1 , wherein the plurality of drop ejectors comprise a first plurality of drop ejectors over the first rib and a second plurality of drop ejectors over the second rib.

4. The fluid ejection printhead of claim 3 , wherein the drop ejection circuitry is to control ejection of drops from the first plurality of drop ejectors and the second plurality of drop ejectors.

5. The fluid ejection printhead of claim 1 , wherein the plurality of drop ejectors comprises a plurality of columns of the drop ejectors, and wherein a first column of the drop ejectors is disposed over the first rib and a second column of drop ejectors is disposed over the second rib.

6. The fluid ejection printhead of claim 1 , wherein the thermal sense resistor comprises a serpentine-shaped structure having a plurality of elongate portions extending along a length of the second rib and a plurality of transition regions extending along a width of the second rib.

7. The fluid ejection printhead of claim 1 , wherein the first rib is devoid of thermal sensors.

8. The fluid ejection printhead of claim 1 , further comprising a substrate including the first rib, wherein the fluid feed slot is off centered in the substrate.

9. A fluid ejection printhead comprising:
a fluid feed slot to supply a fluid to a plurality of drop ejectors;
a first rib at a first side of the fluid feed slot and supporting drop ejection circuitry to control ejection of drops of the fluid from the plurality of drop ejectors; and
a second rib at a second side, opposite the first side, of the fluid feed slot and supporting a thermal sensor to facilitate determination of a temperature of the first rib;
wherein the plurality of drop ejectors comprises a plurality of columns of the drop ejectors, and wherein a first column of the drop ejectors is disposed over the first rib and a second column of drop ejectors is disposed over the second rib;
wherein the first rib is devoid of thermal sensors.

10. The fluid ejection printhead of claim 9 , wherein the first rib is wider than the second rib.

11. The fluid ejection printhead of claim 9 , wherein the fluid feed slot is disposed between the first rib and the second rib.

12. The fluid ejection printhead of claim 9 , wherein the plurality of drop ejectors comprise a first plurality of drop ejectors over the first rib and a second plurality of drop ejectors over the second rib.

13. The fluid ejection printhead of claim 12 , wherein the drop ejection circuitry is to control ejection of drops from the first plurality of drop ejectors and the second plurality of drop ejectors.

14. The fluid ejection printhead of claim 9 , wherein the thermal sensor comprises a thermal sense resistor.

15. The fluid ejection printhead of claim 14 , wherein the thermal sense resistor comprises a serpentine-shaped structure having a plurality of elongate portions extending along a length of the second rib and a plurality of transition regions extending along a width of the second rib.

16. The fluid ejection printhead of claim 9 , further comprising a substrate including the first rib, wherein the fluid feed slot is off centered in the substrate.

17. A fluid ejection printhead comprising:
a fluid feed slot to supply a fluid to a plurality of drop ejectors;
a first rib at a first side of the fluid feed slot and supporting drop ejection circuitry to control ejection of drops of the fluid from the plurality of drop ejectors; and
a second rib at a second side, opposite the first side, of the fluid feed slot and supporting a thermal sensor to facilitate determination of a temperature of the first rib;
wherein the fluid feed slot is disposed between the first rib and the second rib;
wherein the thermal sensor comprises a thermal sense resistor; and
wherein the first rib is devoid of thermal sensors.

18. The fluid ejection printhead of claim 17 , wherein the first rib is wider than the second rib.

19. The fluid ejection printhead of claim 17 , wherein the plurality of drop ejectors comprise a first plurality of drop ejectors over the first rib and a second plurality of drop ejectors over the second rib.

20. The fluid ejection printhead of claim 19 , wherein the drop ejection circuitry is to control ejection of drops from the first plurality of drop ejectors and the second plurality of drop ejectors.

Assignees

• Hewlett Packard Development Co Lp

Inventors

• Maxfield David

Classifications

• B41J2/04586

  controlling heads of a type not covered by groups B41J2/04575 - B41J2/04585, or of an undefined type · CPC title

• B41J2/04563 Primary

  detecting head temperature; Ink temperature · CPC title

• B41J2/14153 Primary

  Structures including a sensor · CPC title

• B41J2/14072 Primary

  Electrical connections, e.g. details on electrodes, connecting the chip to the outside... · CPC title

• B41J2/04565

  detecting heater resistance · CPC title