Liquid ejection head, liquid ejection apparatus, and method of supplying liquid
First Claim
Patent Images
1. A liquid ejection head comprising:
- an ejection opening for ejecting a liquid;
a passage in which an energy generation element for generating energy used to eject the liquid is disposed;
an ejection opening portion that allows communication between the ejection opening and the passage;
a supply passage for allowing the liquid to flow into the passage from an outside; and
an outflow passage for allowing the liquid to flow out to the outside from the passage,wherein an expression of H−
0.34×
P−
0.66×
W>
1.7 is satisfied when a height of the passage at an upstream side of a communication portion between the passage and the ejection opening portion in a flow direction of the liquid inside the passage is set to H,a length of the ejection opening portion in a direction in which the liquid is ejected from the ejection opening is set to P, anda length of the ejection opening portion in the flow direction of the liquid inside the passage is set to W.
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Abstract
A liquid ejection head includes an ejection opening; a passage in which an energy generation element is disposed; an ejection opening portion that allows communication between the ejection opening and the passage; a supply passage for allowing the liquid to flow into the passage; and an outflow passage for allowing the liquid to flow out to the outside. An expression of H−0.34×P−0.66×W>1.7 is satisfied when a height of the passage is set to H, a length of the ejection opening portion is set to P, and a length of the ejection opening portion is set to W.
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Citations
26 Claims
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1. A liquid ejection head comprising:
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an ejection opening for ejecting a liquid; a passage in which an energy generation element for generating energy used to eject the liquid is disposed; an ejection opening portion that allows communication between the ejection opening and the passage; a supply passage for allowing the liquid to flow into the passage from an outside; and an outflow passage for allowing the liquid to flow out to the outside from the passage, wherein an expression of H−
0.34×
P−
0.66×
W>
1.7 is satisfied when a height of the passage at an upstream side of a communication portion between the passage and the ejection opening portion in a flow direction of the liquid inside the passage is set to H,a length of the ejection opening portion in a direction in which the liquid is ejected from the ejection opening is set to P, and a length of the ejection opening portion in the flow direction of the liquid inside the passage is set to W. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of supplying a liquid in a liquid ejection head including an ejection opening for ejecting a liquid, a passage in which an energy generation element for generating energy used to eject the liquid is disposed, an ejection opening portion that allows communication between the ejection opening and the passage, a supply passage for allowing the liquid to flow into the passage from an outside, and an outflow passage for allowing the liquid to flow out to the outside from the passage,
wherein when supplying the liquid is performed such that the liquid flows into the passage from the outside through the supply passage, and flows out to the outside through the outflow passage from the passage, a flow of the liquid is generated such that the liquid entering an inside of the ejection opening portion from the passage arrives at a position of a meniscus of the liquid formed in the ejection opening, and then returns to the passage, and wherein an expression of H− - 0.34×
P−
0.66×
W>
1.7 is satisfied when a height of the passage at an upstream side of a communication portion between the passage and the ejection opening portion in a flow direction of the liquid inside the passage is set to H,a length of the ejection opening portion in a direction in which the liquid is ejected from the ejection opening is set to P, and a length of the ejection opening portion in the flow direction of the liquid inside the passage is set to W. - View Dependent Claims (14, 15)
- 0.34×
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16. A liquid ejection apparatus comprising:
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a liquid ejection head including an ejection opening for ejecting a liquid, a passage in which an energy generation element for generating energy used to eject the liquid is disposed, an ejection opening portion that allows communication between the ejection opening and the passage, a supply passage for allowing the liquid to flow into the passage from an outside, and an outflow passage for allowing the liquid to flow out to the outside from the passage; and supply means for allowing the liquid to flow into the passage from the outside through the supply passage, and flow out to the outside through the outflow passage from the passage, wherein an expression of H−
0.34×
P−
0.66×
W>
1.7 is satisfied when a height of the passage at an upstream side of a communication portion between the passage and the ejection opening portion in a flow direction of the liquid inside the passage is set to H,a length of the ejection opening portion in a direction in which the liquid is ejected from the ejection opening is set to P, and a length of the ejection opening portion in the flow direction of the liquid inside the passage is set to W. - View Dependent Claims (17, 18, 19)
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20. A liquid ejection head comprising:
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an orifice plate including an ejection opening for ejecting a liquid; and a substrate, a passage for supplying the liquid from one end side to the other end side being formed between the orifice plate and the substrate, and the ejection opening being formed between the one end side and the other end side of the passage, wherein an expression of H−
0.34×
P−
0.66×
W>
1.7 is satisfied when a height of the passage in a communication portion between an ejection opening portion, which allows communication between the ejection opening and the passage, and the passage on the one end side is set to H,a length of the ejection opening portion in a direction in which the liquid is ejected from the ejection opening is set to P, and a length of the ejection opening portion in a direction from the one end side toward the other end side is set to W. - View Dependent Claims (21, 22, 23)
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24. A liquid ejection head comprising:
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an ejection opening for ejecting a liquid; a passage in which an energy generation element for generating energy used to eject the liquid is disposed; an ejection opening portion that allows communication between the ejection opening and the passage; a supply passage for allowing the liquid to flow into the passage from an outside; and an outflow passage for allowing the liquid to flow out to the outside from the passage, wherein an expression of H−
0.34×
P−
0.66×
W>
1.7 and an expression of 0.350×
H+0.227×
P−
0.100×
Z>
4 are satisfied when a height of the passage at an upstream side of a communication portion between the passage and the ejection opening portion in a flow direction of the liquid inside the passage is set to H,a length of the ejection opening portion in a direction in which the liquid is ejected from the ejection opening is set to P, a length of the ejection opening portion in the flow direction of the liquid inside the passage is set to W, and an effective diameter of the inscribed circle of the ejection opening portion is set to Z.
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25. A liquid ejection head comprising:
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an ejection opening for ejecting a liquid; a passage in which an energy generation element for generating energy used to eject the liquid is disposed; an ejection opening portion that allows communication between the ejection opening and the passage; a supply passage for allowing the liquid to flow into the passage from an outside; and an outflow passage for allowing the liquid to flow out to the outside from the passage, wherein an expression of H−
0.34×
P−
0.66×
W>
1.5 is satisfied when a height of the passage at an upstream side of a communication portion between the passage and the ejection opening portion in a flow direction of the liquid inside the passage is set to H,a length of the ejection opening portion in a direction in which the liquid is ejected from the ejection opening is set to P, and a length of the ejection opening portion in the flow direction of the liquid inside the passage is set to W. - View Dependent Claims (26)
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Specification