Inkjet nozzle device having dual chamber inlets and twofold symmetry

摘要

An inkjet nozzle device includes: a nozzle chamber having a floor, a roof and perimeter sidewalls extending between the floor and the roof, wherein a nozzle aperture is defined in the roof; a heating element for generating gas bubbles in the nozzle chamber so as to eject ink through the nozzle aperture, wherein a centroid of the heating element is aligned with a centroid of the nozzle aperture; and a pair of chamber inlets defined in the floor of the nozzle chamber, the chamber inlets being symmetrically disposed about the centroid of the heating element. The inkjet nozzle device has a pair of orthogonal symmetry planes passing through the centroid of the nozzle aperture.

主权项

1. An inkjet nozzle device comprising:
a nozzle chamber having a floor, a roof and perimeter sidewalls extending between the floor and the roof, wherein a nozzle aperture is defined in the roof; and a single heating element for generating gas bubbles in the nozzle chamber so as to eject ink through the nozzle aperture, wherein a centroid of the heating element is aligned with a centroid of the nozzle aperture; a pair of chamber inlets defined in the floor of the nozzle chamber, the chamber inlets being symmetrically disposed about the centroid of the heating element; and a pair of opposed baffle plates symmetrically disposed about the centroid of the heating element,wherein:
the inkjet nozzle device has a pair of orthogonal symmetry planes passing through the centroid of the nozzle aperture; each baffle plate extends between a floor and a roof of the nozzle chamber, each baffle plate being positioned between a respective chamber inlet and the heating element; a central longitudinal axis of the heating element bisects each baffle plate; and each baffle plate is wider than the heating element.