Fluidic ejection dies with enclosed cross-channels
In one example in accordance with the present disclosure, a fluidic ejection die is described. The die includes an array of nozzles. Each nozzle includes an ejection chamber and an opening. A fluid actuator is disposed within the ejection chamber. The fluidic ejection die also includes an army of passages, formed in a substrate, to deliver fluid to and from the ejection chamber. The fluidic ejection die also includes an army of enclosed cross-channels. Each enclosed cross-channel of the army of enclosed cross-channels is fluidly connected to a respective plurality of passages of the array of passages.
1. A fluidic ejection die, comprising:
an array of nozzles, each nozzle comprising:
an ejection chamber;
an opening; and
a fluid actuator disposed within the ejection chamber;
an array of passages, formed in a substrate, to deliver fluid to and from the ejection chamber; and
an array of enclosed cross-channels, formed on a back surface of the substrate, each enclosed cross-channel of the array being fluidly connected to a respective plurality of passages of the array of passages.
2. The fluidic ejection die of claim 1 , wherein the passages are formed in a perforated layer of the substrate.
3. The fluidic ejection die of claim 1 , wherein an enclosed cross-channel delivers fluid to rows of different sub-arrays of passages.
4. The fluidic ejection die of claim 1 , wherein the array of enclosed cross-channels are grouped into sub-arrays, each sub-array of enclosed cross-channels delivering fluid to rows of a sub-array of the array of passages.
5. The fluidic ejection die of claim 4 , wherein the different sub-arrays of passages correspond to different color fluids.
6. The fluidic ejection die of claim 1 , wherein:
each nozzle further comprises a channel to direct fluid to and from the corresponding ejection chamber; and
the channel and the passages that correspond to a nozzle form a micro-recirculation loop.
7. The fluidic ejection die of claim 1 , wherein passages of a row correspond to the same enclosed cross-channel.
8. The fluidic ejection die of claim 1 , wherein the passages of a row correspond to multiple enclosed cross-channels.
9. The fluidic ejection die of claim 1 , wherein fluid flow through the enclosed cross-channel is perpendicular to fluid flow in the passages.
10. A printing fluid cartridge, comprising:
a housing;
a reservoir disposed within the housing to contain fluid to be deposited on a substrate;
and an array of fluidic ejection dies disposed on the housing, each fluidic ejection die comprising:
an array of nozzles, each nozzle comprising:
an ejection chamber;
an opening; and
a fluid actuator disposed within the ejection chamber;
an array of passages to deliver fluid to and from ejection chambers; and
an array of enclosed cross-channels, formed on a back surface of the substrate, each enclosed cross-channel of the array of enclosed cross channels being fluidly connected to a respective plurality of passages of the array of passages.
11. The printing fluid cartridge of claim 10 , wherein:
each nozzle further comprises:
a channel to direct fluid to and from the corresponding ejection chamber; and
a secondary fluid actuator to move fluid through the channel; and
the channel and passages that correspond to a nozzle form a micro-recirculation loop of the nozzle.
12. The printing fluid cartridge of claim 10 , wherein:
the printing fluid cartridge is a substrate-wide printbar; and
the array of fluid ejection dies are grouped into printheads, wherein the printheads are staggered across a width of a substrate on which the fluid is to be deposited.
13. A method for making a fluidic ejection die comprising:
forming an array of nozzles and corresponding passages through which fluid is ejected;
forming a number of enclosed cross-channels, wherein the number of enclosed cross-channels deliver fluid to and from the passages; and
joining the array of nozzles and corresponding passages to the number of enclosed cross-channels.
14. The method of claim 13 , wherein forming the number enclosed of cross-channels on the substrate comprises etching the back layer of a substrate on which the passages are formed.
15. The method of claim 13 , wherein forming the array of nozzles and corresponding passages comprises adhering a membrane containing the passages to a layer that defines the nozzles.