Patent ID: 7914126

Claim:
An ink jet head manufacturing device for manufacturing an ink jet head having a substrate on which an ink pressure chamber, an ink-pressure control part to increase or decrease a pressure of ink within the ink pressure chamber, and a control unit to control a driving signal supplied to the ink-pressure control part are mounted, wherein the ink jet head manufacturing device is arranged so that a first wiring connected to a high voltage power supply terminal of the control unit, a second wiring connected to a ground terminal of the control unit, and a third wiring connected to a common electrode of the ink-pressure control part are not mutually short-circuited on the substrate of the ink jet head, the ink jet head manufacturing device comprising: first and second diodes arranged on a path extending from a gate of the control unit to an individual electrode of the ink-pressure control part, the first diode allowing a current from the individual electrode of the ink-pressure control part to flow into the first wiring, and the second diode allowing a current from the second wiring to flow into the individual electrode of the ink-pressure control part; and a short-circuit unit arranged to short-circuit the first wiring and the second wiring when depolarization or polarization of the ink-pressure control part is performed.