| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid ejection apparatus and an ejection abnormality determination method for detecting a pressure change in a pressure chamber and determining an ejection abnormality of a nozzle that the pressure chamber has. SOLUTION: An integrated value N is obtained by integrating detected signals 100 obtained from a piezoelectric element 58 in an integration unit 202. In a comparison unit 204, the integrated value N is compared with a first threshold value Nth1 with respect to the residual vibration of a pressure wave and a second threshold value Nth2 with respect to the maximum value of the pressure wave. The comparison results are recorded in comparison result registers 208A and 208B and read at determination signal sampling timing corresponding to respective integration periods as first and second determination signals 209A and 209B. Whether ejection is abnormal or not is determined according to the determination signals 209A and 209B. An ejection abnormality caused by the generation of a bubble in the pressure chamber is determined according to the first determination signal 209A and the second determination signal 209B, and the ejection abnormality caused by nozzle clogging is determiend according to the second determination signal 209B. COPYRIGHT: (C)2006,JPO&NCIPI
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