INKJET HEAD
First Claim
1. An inkjet head comprising:
- a passage unit comprising a common ink chamber, and an individual ink passage leading from an outlet of the common ink chamber through a pressure chamber to an ink ejection port; and
an actuator that can selectively take a first state wherein a volume of the pressure chamber is V1 and a second state wherein the volume of the pressure chamber is V2 larger than V1, the actuator changing from the first state to the second state and then returning to the first state to eject ink from the ejection port,a proper oscillation period Ts of an oscillation generated by integral deformation of the actuator and the pressure chamber when ink is ejected from the ejection port, and a proper oscillation period Td of ink filling up a first partial passage in the individual ink passage leading from an outlet of the pressure chamber to the ejection port, satisfying a condition that Ts/Td is not less than 0.36 and not more than 0.90;
or not less then 1.1 and not more than 1.7.
2 Assignments
0 Petitions
Accused Products
Abstract
An actuator can selectively take a first state wherein a volume of a pressure chamber is V1 and a second state wherein the volume of the pressure chamber is V2 larger than V1. The actuator changes from the first state to the second state and then returns to the first state to eject ink from an ejection port. A proper oscillation period Ts of an oscillation generated by integral deformation of the actuator and the pressure chamber when ink is ejected from the ejection port, and a proper oscillation period Td of ink filling up a first partial passage leading from an outlet of the pressure chamber to the ejection port in an individual ink passage, satisfy a condition that Ts/Td is not less than 0.36 and not more than 0.90; or not less then 1.1 and not more than 1.7.
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Citations
9 Claims
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1. An inkjet head comprising:
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a passage unit comprising a common ink chamber, and an individual ink passage leading from an outlet of the common ink chamber through a pressure chamber to an ink ejection port; and an actuator that can selectively take a first state wherein a volume of the pressure chamber is V1 and a second state wherein the volume of the pressure chamber is V2 larger than V1, the actuator changing from the first state to the second state and then returning to the first state to eject ink from the ejection port, a proper oscillation period Ts of an oscillation generated by integral deformation of the actuator and the pressure chamber when ink is ejected from the ejection port, and a proper oscillation period Td of ink filling up a first partial passage in the individual ink passage leading from an outlet of the pressure chamber to the ejection port, satisfying a condition that Ts/Td is not less than 0.36 and not more than 0.90;
or not less then 1.1 and not more than 1.7. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification