Ink delivery system for high speed printing

An inkjet print cartridge comprising:

• a housing having an internal ink chamber in fluid communication with an internal ink conduit;
• a first wall and a second wall defining said internal ink conduit, said first and second walls being separate from walls forming said housing;
• a substrate, having a plurality of outer edges, a front surface and a back surface, mounted on said housing and including a plurality of individual ink ejection chambers defined by a barrier layer formed on the front surface of said substrate and having an ink ejection element in each of said ink ejection chambers, each of said ink ejection chambers having an ink inlet channel, said back surface having a portion across which ink flows;
• an ink channel fluidically connecting said internal ink conduit with said ink inlet channels;
• and
• a plurality of ink orifices aligned with said ink ejection chambers,
• wherein said internal ink conduit has an opening proximate to said back surface of said substrate to allow ink to flow from said opening into said ink channel and across the portion of the back surface of said substrate.
• wherein said ink channel allows said ink to flow across at least the portion of the back surface of said substrate and through a slot formed in said substrate and into said ink inlet channels.

An inkjet print cartridge comprising:

• a housing having an internal ink chamber in fluid communication with an internal ink conduit;
• a first wall and a second wall defininf said internal ink conduit, said first and second walls being seperate from walls forming said housing;
• a substrate, having a plurality of outer edges, a front surface and a back surface, mounted on said housing and including a plurality of individual ink ejection chambers defined by a barrier layer formed on the front surface of said substrate and having an ink ejection element in each of said ink ejection chambers, each of said ink ejection chambers having an ink inlet channel, said back surface having a portion across which ink flow;
• an ink channel fluidically connecting said internal ink conduit with said ink inlet channels;
• a plurality of ink orifices aligned with said ink ejection chambers, wherein said internal ink conduit has an opening proximate to said back surface of said substrate to allow ink to flow from said opening into said ink channel and across the portion of the back surface of said substrate;
• and

An inkjet print cartridge comprising:

• a housing having an internal ink chamber in fluid communication with an internal ink conduit;
• a first wall and a second wall defininf said internal ink conduit, said first and second walls being seperate from walls forming said housing;
• a substrate, having a plurality of outer edges, a front surface and a back surface, mounted on said housing and including a plurality of individual ink ejection chambers defined by a barrier layer formed on the front surface of said substrate and having an ink ejection element in each of said ink ejection chambers, each of said ink ejection chambers having an ink inlet channel, said back surface having a portion across which ink flow;
• an ink channel fluidically connecting said internal ink conduit with said ink inlet channels;
• a plurality of ink orifices aligned with said ink ejection chambers, wherein said internal ink conduit has an opening proximate to said back surface of said substrate to allow ink to flow from said opening into said ink channel and across the portion of the back surface of said substrate;
• an external supply of ink;
• and
• a pressure regulator in said internal ink chamber, said pressure regulator being in fluid communication with said internal ink chamber and said external supply of ink.

An inkjet printer comprising:

• a scanning carriage for scanning along a scan direction;
• a housing mounted in said scanning carriage, and having an internal ink chamber in fluid communication with an internal ink conduit;
• a pressure regulator in said internal ink chamber, and in fluid communication with said internal ink chamber and an external supply of ink;
• a substrate having a front surface and a back surface, said substrate being mounted on said housing and having a plurality of individual ink ejection chambers defined by a barrier layer formed on the front surface of said substrate and having an ink ejection element in each of said ink ejection chambers, said ink ejection chambers forming a straight linear array substantially along a length of the substrate, each ink ejection chamber having an ink inlet channel of a same length;
• an ink channel fluidically connecting said internal ink conduit with said ink inlet channels;
• and
• a plurality of ink orifices aligned with said ink ejection chambers,
• wherein the housing is skewed with respect to the scanning carriage at a fixed angular position such that the straight linear array of ink ejection chambers is not perpendicular to the scan direction of the carriage.

An inkjet printer comprising:

• a scanning carriage;
• a housing mounted in said scanning carriage and having an internal ink chamber in fluid communication with an internal ink conduit;
• a first wall and a second wall defining said internal ink conduit, said first and second walls being separate from walls forming said housing;
• a pressure regulator in said internal ink chamber and in fluid communication with said internal ink chamber and an external supply of ink;
• a substrate, having a front surface and a back surface, mounted on said housing and having a plurality of individual ink ejection chambers defined by a barrier layer formed on the front surface of said substrate and having an ink ejection element in each of said ink ejection chambers, each of said ink ejection chambers having an ink inlet channel, said back surface having a portion across which ink flows;
• an ink channel fluidically connecting said ink conduit with said ink inlet channels;
• and
• a nozzle member having a plurality of ink orifices formed therein, said nozzle member being positioned to overlie said barrier layer with said orifices aligned with said ink ejection chambers,
• wherein said internal ink conduit has an opening proximate to said back surface of said substrate to allow ink to flow from said opening into said ink channel and across the portion of the back surface of said substrate.

A method of printing comprising:

• providing a print cartridge mounted on a scanning carriage, the scanning carriage moving along a scan direction, the print cartridge comprising:
• a housing having an internal ink chamber in fluid communication with an internal ink conduit;
• a pressure regulator in the internal ink chamber, the pressure regulator in fluid communication with the internal ink chamber and an external ink supply;
• a substrate mounted on the housing, the substrate having a front surface, a back surface, and a plurality of ink ejection chambers, the plurality of ink ejection chambers forming a straight linear array substantially along a length of the substrate, each ink ejection chamber having an ink inlet channel of a same length;
• an ink channel fluidically connecting the internal ink conduit with the ink inlet channels;
• and
• a plurality of ink orifices, each ink orifice being aligned with a respective ink ejection chamber;
• supplying ink from the external ink supply through the pressure regulator of the print cartridge into the internal ink chamber through the ink channel and ink inlet channels and into the ink ejection chambers of the substrate;
• and
• scanning the carriage along the scan direction while expelling ink onto a recording medium,
• wherein the print cartridge is mounted on the scanning carriage at a fixed angular position such that the straight linear array of ink ejection chambers is not perpendicular to the scan direction of the carriage.