Inkjet printhead assembly having very high nozzle packing density

An inkjet printhead assembly comprising:

• at least one printhead, each printhead including:
• a substrate having a first ink feed slot formed in the substrate, wherein the first ink feed slot has a first side and second side along a vertical length of the first ink feed slot;
• a first column of drop generators formed along the first side of the first ink feed slot;
• and
• a second column of drop generators formed along the second side of the first ink feed slot, wherein each drop generator in the first and second columns of drop generators includes a nozzle, and wherein a nozzle packing density for nozzles in the first and second columns of drop generators including the area of the first ink feed slot is at least approximately 100 nozzles per square millimeter (mm2).

An inkjet printing system comprising:

• at least one printhead, each printhead including:
• a substrate having a first ink feed slot formed in the substrate, wherein the first ink feed slot has a first side and second side along a vertical length of the first ink feed slot;
• a first column of drop generators formed along the first side of the first ink feed slot;
• and
• a second column of drop generators formed along the second side of the first ink feed slot, wherein each drop generator in the first and second columns of drop generators includes a nozzle, and wherein a nozzle packing density for nozzles in the first and second columns of drop generators including the area of the first ink feed slot is at least approximately 100 nozzles per square millimeter (mm2).

A method of forming an inkjet printhead on a substrate, the method comprising:

• forming a first ink feed slot in the substrate, wherein the first ink feed slot has a first side and second side along a vertical length of the first ink feed slot;
• forming a first column of drop generators on the substrate along the first side of the first ink feed slot including forming a nozzle in each drop generator;
• and
• forming a second column of drop generators on the substrate along the second side of the first ink feed slot including forming a nozzle in each drop generator, wherein a nozzle packing density for nozzles in the first and second columns of drop generators including the area of the first ink feed slot is at least approximately 100 nozzles per square millimeter (mm2).