Recording head for inkjet recording device

An ink jet recording device comprising:

• an ink jet recording head including;
• a plurality of nozzle elements that ejects ink droplets, each nozzle element having an ink pressure chamber filling ink therein, an orifice leading to the ink pressure chamber, and a diaphragm formed as a part of the ink pressure chamber and having a first surface opposed to the ink pressure chamber, and a second surface opposite to the first surface;
• and
• a plurality of piezoelectric elements provided in one-to-one correspondence with the plurality of nozzle elements, each piezoelectric element being fixed to the second surface of each diaphragm and having a positive pole and a negative pole, each piezoelectric element expanding and contracting to vary volume of the ink pressure chamber when a voltage potential difference between the positive pole and the negative pole is varied, wherein each nozzle element ejects an ink droplet from the corresponding orifice when the volume of the corresponding ink pressure chamber decreases;
• and
• a driving unit that controls expansion and contraction of each piezoelectric element,
• wherein the plurality of nozzle elements includes a first nozzle element and a second nozzle element adjacent to the first nozzle element, and a first piezoelectric element and a second piezoelectric element correspond to the first nozzle element and the second nozzle element respectively,
• wherein polarization of the first nozzle element is substantially equivalent to, but directionally opposite of the polarization of the piezoelectric element of the second nozzle element, and
• wherein the driving unit controls the first piezoelectric element and the second piezoelectric element to expand and contract in a complementary manner.

An ink jet recording device comprising:

• an ink jet recording head including;
• a plurality of nozzle elements that ejects ink droplets, each nozzle element having an ink pressure chamber filling ink therein, an orifice leading to the ink pressure chamber, and a diaphragm formed as a part of the ink pressure chamber and having a first surface opposed to the ink pressure chamber, and a second surface opposite to the first surface;
• and
• a plurality of piezoelectric elements provided in one-to-one correspondence with the plurality of nozzle elements, each piezoelectric element being fixed to the second surface of each diaphragm and having a positive pole, a negative pole, a common electrode to which a drive signal is applied and an individual electrode, each piezoelectric element expanding and contracting to vary volume of the ink pressure chamber when a voltage potential difference between the positive pole and the negative pole is varied, each nozzle element ejecting an ink droplet from the corresponding orifice when the volume of the corresponding ink pressure chamber decreases;
• and
• a driving unit that controls expansion and contraction of each piezoelectric element, the driving unit including:
• a drive signal generating unit that generates the drive signals;
• a switching element capable of performing on/off switching actions, the switching element having a first terminal to which a predetermined voltage is applied and a second terminal connected to the individual electrodes of both of the first piezoelectric element and the second piezoelectric element commonly so that each piezoelectric element expands and contracts when the switching element is closed;
• and
• a switching element driving unit that controls the on/off actions of the switching element;
• and
• wherein the plurality of nozzle elements includes a first nozzle element and a second nozzle element adjacent to the first nozzle element, and a first piezoelectric element and a second piezoelectric element correspond to the first nozzle element and the second nozzle element respectively, and
• wherein the positive pole of the first piezoelectric element is connected to the common electrode of the first piezoelectric element and the negative pole of the first piezoelectric element is connected to the individual electrode of the first piezoelectric element, when the positive pole of the second piezoelectric element is connected to the individual electrode of the second piezoelectric element and the negative pole of the second piezoelectric element is connected to the common electrode of the second piezoelectric element.