Liquid ejection head and liquid ejecting apparatus
AssigneeCanon Kabushiki Kaisha
InventorsTOMOO IIZUMI, HISAO OKITA, YUJI TAMARU, KIMIYUKI HAYASAKI, YOSUKE TAKAGI
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Abstract
A liquid ejection head including a piezoelectric pump for circulating ink, the liquid ejection head comprises a booster circuit configured to generate a boosted voltage for driving the piezoelectric pump in response to a driving signal, a driving circuit configured to generate a pump driving signal for driving the piezoelectric pump based on the boosted voltage, and a monitoring circuit configured to monitor a displacement of a boosted voltage output from the booster circuit. The monitoring circuit readably holds a result of monitoring the boosted voltage.
Claims14
A liquid ejection head including a piezoelectric pump for circulating ink, the liquid ejection head comprising:
- a booster circuit configured to generate a boosted voltage for driving the piezoelectric pump in response to a driving signal;
- a driving circuit configured to generate a pump driving signal for driving the piezoelectric pump based on the boosted voltage;
- and
- a monitoring circuit configured to monitor a displacement of a boosted voltage output from the booster circuit,
- wherein the monitoring circuit readably holds a result of monitoring the boosted voltage.
A liquid ejecting apparatus including a liquid ejection head including a piezoelectric pump for circulating ink,
- wherein the liquid ejection head comprising:
- a booster circuit configured to generate a boosted voltage for driving the piezoelectric pump in response to a driving signal;
- a driving circuit configured to generate a pump driving signal for driving the piezoelectric pump based on the boosted voltage;
- and
- a monitoring circuit configured to monitor a displacement of a boosted voltage output from the booster circuit to hold a result of the monitoring, and
- the liquid ejecting apparatus comprising:
- one or more controllers including one or more processors and one or more memories, wherein the one or more controllers are configured to:
- control the driving signal to lower a power of the boosted voltage generated by the booster circuit, and determine whether the liquid ejection head is normal based on the result held by the monitoring circuit, at a time of diagnosis of the liquid ejection head.
Dependencies are inferred from the claim text.