Patent ID: 7866781
Filing Date: 2011-01-11
Classification: B41J

Abstract:
1. An apparatus to check an operation of a piezoelectric inkjet head, the apparatus comprising: a first current detection unit to detect a first current output from a piezoelectric element of the piezoelectric inkjet head when a predetermined voltage is applied; a second current detection unit to detect a second current from a capacitor having a capacitance with the same magnitude as a capacitor component of the piezoelectric element when the voltage is applied to the capacitor; a third current detection unit to detect a third current corresponding to a difference between the first current and the second current, as an amount of deformation of the piezoelectric element according to the application of the voltage; and a gain adjusting unit adjusting a gain of the second current so that the second current has the same value as a current output due to the capacitor component of the piezoelectric element, wherein the gain adjusting unit comprises at least one OP amplifier having a variable resistor and controls the variable resistor so that the second current has the same value as the current output due to the capacitor component of the piezoelectric element.