| 摘要 |
PROBLEM TO BE SOLVED: To always discharge a normal ink by a method wherein a passage substrate is grounded at a GND electric potential, a pulse voltage to become + electric potential is applied to an individual electrode from the GND electric potential to transform a diaphragm, and the ink is discharged from a nozzle. SOLUTION: On the surface of a P type silicon substrate 2, a B dope layer 41 in which boron is diffused in 1×10E19 pieces/cm<3> or more, is formed, and an electric energy is applied to an individual electrode 31 from an ink jet head driver circuit 220 which is constituted of a CMOSIC. When Dn is made H in order to discharge an ink, transistors 141, 142 are turned on, and when a pulse V3 is applied, an electric potential of V3 is output to a SEGn terminal. At this time, the electric potential of a common electrode 17, i.e., a diaphragm, is always GND, and for this reason, the diaphragm 5 is negatively charged, and the individual electrode 31 is positively charged, and the diaphragm 5 is drawn by a static electric power and is driven. When Dn is L, the transistors 141, 142 are turned off, and a transistor 143 is turned on, and the GND electric potential is output to the SEGn terminal, and the diaphragm 5 is not driven.
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