LIQUID DROP EJECTOR AND METHOD FOR DETECTING/JUDGING ABNORMALITY OF HEAD

摘要

A liquid drop ejector and a method for detecting/judging abnormality of a liquid drop ejection head in which abnormal ejection of the head is detected and an appropriate recovery processing can be carried out depending on the cause thereof. The liquid drop ejector comprises a plurality of liquid drop ejection heads each having a diaphragm and an actuator for driving the diaphragm, a circuit driving the actuator, a means (16) for detecting residual oscillation of the diaphragm after the actuator is driven through the driving circuit, a means (17) for operating the number of reference pulses generated by a pulse generating means based on the residual oscillation of the diaphragm, a means for measuring the time elapsed after the actuator is driven through the driving circuit, and a means (20) for judging abnormality of the liquid drop ejection head based on the operational results from the operating means (17) and the elapsed time measured by the time measuring means.