Determining the operational status of a printhead

A system and method for determining the operational status of a nozzle in an inkjet printhead having a piezoelectric actuator. The system comprising: a driving circuit configured to apply a driving signal to the piezoelectric actuator during a first time period; and a sensing circuit configured to measure the current within the piezoelectric actuator as a function of time during a second time period after the first time period; wherein the system determines the operational status of the nozzle in dependence on the time taken for the measured current to reach a predetermined condition during the second time period. Also disclosed is a system and method for determining the operational status of a nozzle in dependence on the slope of the measured current as a function of time during the second time period. 本申请涉及确定打印头的操作状态。一种用于确定喷墨打印头中的喷嘴的操作状态的系统和方法，该喷墨打印头具有压电致动器，该压电致动器被配置为使得墨通过喷嘴喷射，该系统包括：驱动电路，被配置为在第一时间段期间向压电致动器施加驱动信号；以及感测电路，被配置为在第一时间段之后的第二时间段期间测量作为时间的函数的压电致动器内的电流；其中，该系统被配置为根据在第二时间段期间所测量的电流达到预定条件所花费的时间或在第二时间段期间作为