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US 6,270,212 B1Granted
Print head for an ink jet printer
AssigneeNEC Corporation
InventorsTatsuya Kusumi, Koichi Tanaka
Life of this patent
Estimating the term…
Abstract
A print head for an ink jet printer of the present invention includes a plurality of nozzles for ejecting ink, an ink passage fluidly communicated to the nozzles, and a filter disposed in the ink passage. The ink passage has a hydrophobic wall upstream of the filter and a hydrophilic wall downstream of the filter. The print head is capable of reducing the deposition of bubbles on a nozzle portion and thereby insuring desirable printing free from defective ink ejection.
Claims10
A print head for an ink jet printer, comprising:
- a nozzle for ejecting ink;
- an ink passage in fluid communication with to said nozzle;
- and
- a filter disposed in said ink passage;
- said ink passage having a hydrophobic wall upstream of said filter and a hydrophilic wall downstream of said filter.
2 more elements
A print head for an ink jet printer, comprising:
- a nozzle for ejecting ink;
- an ink passage in fluid communication with to said nozzle;
- and
- a filter disposed in said ink passage;
- said ink passage having a part upstream of said filter formed of a hydrophobic resin and a part downstream of said filter formed of a hydrophilic resin.
2 more elements
Dependencies are inferred from the claim text.