Patent ID: 8287082
Filing Date: 2012-10-16
Classification: B41J

Abstract:
1. A method of detecting a discharging state of an inkjet head comprising a passage communicating with a discharge port for discharging ink, an energy generating element, provided in the passage, for generating energy to discharge ink from the discharge port, and a detecting unit, provided in the passage, the method comprising: supplying power to the energy generating element; applying a first pulse current having a predetermined pulse width to the detecting unit so as to heat ink in the passage, after supplying power to the energy generating element; applying a second pulse current having a pulse width smaller than the predetermined pulse width to the detecting unit, after applying the first pulse current; and measuring an output signal from the detecting unit in response to the second pulse current and comparing a value of the output signal with a threshold value, so as to measure a temperature of the ink in the passage.