Ink jet head, drive method of ink jet head, and ink jet recording apparatus

An ink jet head comprising:

• an ink channel that communicates with a nozzle that ejects ink;
• a pair of oscillating plates that are disposed opposing to each other on walls of said ink channel;
• and
• a pair of electrodes provided in contact with said oscillating plates, respectively;
• wherein a voltage is applied between said electrodes;
• and
• wherein said electrodes are disposed respectively on an inside of said oscillating plates provided opposing to each other.

An electrostatic ink jet recording apparatus having a set of elements comprising:

• an ink channel that communicates with a nozzle that ejects ink;
• a pair of non-piezoelectric oscillating plates that are disposed opposing to each other on walls of said ink channel;
• a pair of electrodes disposed in contact with said non-piezoelectric oscillating plates, respectively;
• and
• a controller for controlling a voltage to be applied between said electrodes.

An ink jet recording apparatus comprising:

• an ink channel that communicates with a nozzle that ejects ink;
• a pair of oscillating plates that are disposed opposing to each other on walls of said ink channel;
• a pair of electrodes disposed in contact with said oscillating plates, respectively;
• and
• a controller for controlling a voltage to be applied between said electrodes;
• wherein a plurality of sets of said composing elements are provided;
• and
• wherein said electrodes are disposed respectively on an inside of said oscillating plates provided opposing to each other.

An ink jet recording apparatus comprising:

• an ink channel that communicates with a nozzle that ejects ink;
• a pair of oscillating plates that are disposed opposing to each other on walls of said ink channel;
• a pair of electrodes disposed in contact with said oscillating plates, respectively;
• and
• a controller for controlling a voltage to be applied between said electrodes;
• wherein relative dielectric constant of ink to be filled in said ink channel is larger than 1.

An ink jet head comprising:

• an ink channel that communicates with a nozzle that ejects ink;
• an oscillating plate that is disposed facing said ink channel;
• a first electrode disposed on said oscillating plate, a side where said first electrode is disposed being opposite to a side that faces said ink channel;
• a second electrode that is disposed opposing said first electrode;
• and
• a third electrode located relative to said first electrode on a side opposite to a side said second electrode is located.

An ink jet recording apparatus comprising:

• an ink channel that communicates with a nozzle that ejects ink;
• an oscillating plate that is disposed facing said ink channel;
• a first electrode disposed on said oscillating plate, a side where said first electrode is disposed being opposite to a side that faces said ink channel;
• a second electrode that is disposed opposing said first electrode;
• a third electrode located relative to said first electrode on a side opposite to a side said second electrode is located;
• and
• a controller for controlling application of voltages to said electrodes.

An electrostatic ink jet head comprising:

• an ink channel that is defined by a plurality of surfaces that include a first surface and a second surface opposing to said first surface through said ink channel, said first surface being a main surface of a non-piezoelectric oscillating plate, said ink channel communicating with a nozzle for ejecting ink therefrom;
• a first electrode provided at a position corresponding to the first surface;
• and
• a second electrode provided at a position corresponding to the second surface;
• wherein an electrical field can be generated between said first and second electrodes by applying an electrical voltage therebetween.