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US 4,502,060 AGranted
Barriers for thermal ink jet printers
AssigneeHewlett-Packard Company
InventorsGlenn H. Rankin, Harold W. Levie
Life of this patent
Estimating the term…
Abstract
A thermal ink jet print head is provided having a new and improved barrier design. Two barriers are provided for each resistor, the barriers partially surrounding the resistor. The barriers are spaced apart to provide ink feed channels to the resistor and are arranged to impart angular momentum to the ink relative to the resistor during refill on bubble collapse.
Claims6
An ink jet print head comprising:
- a substrate;
- an orifice plate having a surface spaced apart from said substrate for containing ink therebetween and having an orifice therein for ejecting ink;
- heating means located on said substrate for producing bubbles in said ink;
- and
- barrier means, between said substrate and said surface, for partially surrounding said heating means for directing the flow of ink to said heating means in a generally circular direction other than toward the center of said heating means.
2 more elements
An ink jet print head comprising:
- a substrate;
- an orifice plate having a surface spaced apart from said substrate for containing ink therebetween and having an orifice therein for ejecting ink;
- heating means located on said substrate for producing bubbles in said ink;
- and
- barrier means between said surface and said substrate for directing the flow of ink to said heating means in a manner which imparts angular momentum to said ink about an axis orthogonal to said surface.
2 more elements
Dependencies are inferred from the claim text.