Liquid ejection head and ink jet printer
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United States of America Patent
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Jan 15, 2019
Grant Date -
Jan 25, 2018
app pub date -
Jan 28, 2016
filing date -
Jan 30, 2015
priority date (Note) -
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Abstract
A liquid ejection head includes an ejection port to eject liquid, a pressure chamber communicating with the ejection port, and a piezoelectric element to pressurize the pressure chamber and eject from the ejection port, the liquid stored in the pressure chamber. At least a part of a wall portion defining the pressure chamber includes a portion where vibration characteristics are different between a pressurized state in which the pressure chamber is pressurized by the piezoelectric element and a depressurized state in which the pressure chamber is depressurized by ejecting the liquid from the ejection port and stopping pressurization to the pressure chamber, and the portion having different vibration characteristics is adapted to reduce pressure fluctuation in the pressure chamber in the depressurized state.
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