US 12,434,478 B2
Compact inkjet nozzle device with high degree of symmetry
Angus John North, North Ryde (AU); Samuel George Mallinson, North Ryde (AU); and Graeme Lowe, North Ryde (AU)
Assigned to Memjet Technology Limited, Dublin (IE)
Filed by Memjet Technology Limited, Dublin (IE)
Filed on Aug. 14, 2023, as Appl. No. 18/449,556.
Claims priority of provisional application 63/398,749, filed on Aug. 17, 2022.
Prior Publication US 2024/0059070 A1, Feb. 22, 2024
Int. Cl. B41J 2/175 (2006.01); B41J 2/14 (2006.01)
CPC B41J 2/175 (2013.01) [B41J 2/14 (2013.01); B41J 2002/14467 (2013.01); B41J 2002/14475 (2013.01); B41J 2202/11 (2013.01); B41J 2202/16 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An inkjet nozzle device comprising an elongate main chamber having a floor, a roof and a perimeter wall extending between the floor and the roof, the perimeter wall having a pair of longer sidewalls and a pair of shorter endwalls, the main chamber comprising:
a firing chamber disposed towards one of the sidewalls, the firing chamber having a nozzle aperture defined in the roof and an elongate bar heater for ejection of ink through the nozzle aperture, the bar heater having a longitudinal axis;
an antechamber disposed towards an opposite sidewall for supplying ink to the firing chamber, the antechamber having first and second chamber inlets defined in the floor; and
an elongate baffle plate having a longitudinal axis extending parallel with the longitudinal axis of the bar heater, the baffle plate partitioning the main chamber to define the firing chamber and the antechamber,
wherein;
the inkjet nozzle device has mirror symmetry about a symmetry plane extending perpendicular to the longitudinal axes of the bar heater and the baffle plate;
the symmetry plane bisects the nozzle aperture, the bar heater and the baffle plate;
the first and second chamber inlets are positioned towards respective first and second opposite ends of the baffle plate; and
the first and second chamber inlets are equidistant from the symmetry plane.