Print head sensing chamber circulation
First Claim
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1. An apparatus comprises:
- a print head having a fluid slot and a sensing chamber having a first port connected to the fluid slot and a second port;
a drop generator fluidly coupled to the fluid slot to receive fluid from the fluid slot;
a fluid level sensor within the sensing chamber;
a circulation passage extending from the fluid slot and fluidly coupled to the second port; and
a fluid pump, comprising a resistor to vaporize fluid to pump adjacent fluid, to circulate fluid through the circulation passage.
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Abstract
A print head has an ink slot and a sensing chamber having a first port connected to the fluid slot and a second port. The sensing chamber contains an ink level sensor. A recirculation passage extends from the fluid slot and is fluidly coupled to the second port. A fluid pump circulates fluid through the recirculation passage.
13 Citations
14 Claims
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1. An apparatus comprises:
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a print head having a fluid slot and a sensing chamber having a first port connected to the fluid slot and a second port; a drop generator fluidly coupled to the fluid slot to receive fluid from the fluid slot; a fluid level sensor within the sensing chamber; a circulation passage extending from the fluid slot and fluidly coupled to the second port; and a fluid pump, comprising a resistor to vaporize fluid to pump adjacent fluid, to circulate fluid through the circulation passage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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sensing a fluid level within a sensing chamber of a print head; and circulating fluid from a fluid slot of the print head into the sensing chamber through a first port and out of the sensing chamber back into the fluid slot through a second port. - View Dependent Claims (10, 11)
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12. A method comprising:
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forming a fluid slot in a substrate; forming a sensing chamber of a print head, the sensing chamber having a first port connected to the fluid slot and a second port; providing an ink level sensor within the sensing chamber; forming a circulation passage from the fluid slot to the second port of the sensing chamber; and forming a pump on the substrate to circulate fluid through the circulation passage. - View Dependent Claims (13, 14)
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Specification