Patent ID: 7914130
Filing Date: 2011-03-29
Classification: B41J

Abstract:
1. A droplet ejection device comprising: a substrate having a first pressure chamber, a second pressure chamber, a third pressure chamber and a fourth pressure chamber extending in a first direction; a nozzle plate provided below the substrate, and having a first nozzle aperture continuous with the first pressure chamber, a second nozzle aperture continuous with the second pressure chamber, a third nozzle aperture continuous with the third pressure chamber, and a fourth nozzle aperture continuous with the fourth pressure chamber; a vibration plate provided above the substrate; a first piezoelectric element provided above the vibration plate and above the first pressure chamber; a second piezoelectric element provided above the vibration plate and above the second pressure chamber; a third piezoelectric element provided above the vibration plate and above the third pressure chamber; and a fourth piezoelectric element provided above the vibration plate and above the fourth pressure chamber, wherein, as viewed in a second direction orthogonal to the first direction, the first nozzle aperture is provided at a position that overlaps the third nozzle aperture, and provided at a position that does not overlap the second nozzle aperture and the forth nozzle aperture; the second nozzle aperture is provided at a position that overlaps the fourth nozzle aperture, and provided at a position that does not overlap the first nozzle aperture and the third nozzle aperture, as viewed in the second direction; the first piezoelectric element is provided at a position that overlaps the third piezoelectric element, and provided at a position that does not overlap the second piezoelectric element and the fourth piezoelectric element, as viewed in the second direction; the second piezoelectric element is provided at a position that overlaps the fourth piezoelectric element, and provided at a position that does not overlap the first piezoelectric element and the third piezoelectric element; the first, second, third, and fourth pressure chambers each have a long side and a short side, as viewed in a plan view; the long side of the first pressure chamber has the same length as the long side of the third pressure chamber; the long side of the second pressure chamber has the same length as the long side of the fourth pressure chamber; and the long side of the first pressure chamber is longer than the long side of the second pressure chamber.