| 摘要 |
An ink jet printhead has a housing 1 defining an ink chamber 2 to which ink is supplied in use. The ink chamber has a uniform cross-section over its length, a sidewall 19, and end walls 5,6. A tubular piezoelectric or electrostrictive actuator 15 is disposed within and extending over the length of the chamber between its end walls, with the longitudinal axis L of the actuator being parallel to that L' of the chamber and capable of radial expansion and contraction. One or more orifices 9,20 in the sidewall 19 of the chamber emit ink droplets in use under the action of the tubular piezoelectric or electrostrictive actuator 15, either in a drop-on-demand printer or a continuous printer. <IMAGE> |
