| 摘要 |
An ink jet printhead with a plurality of nozzles that each nozzle defining a planar nozzle aperture. A bubble forming chamber corresponds to each of the nozzles and a heater is positioned in each of the chambers respectively. The heater has a planar structure with a heater element extending between two electrodes, so that it is suspended by the electrodes in the bubble forming chamber for thermal contact with a printing fluid. The heater element is suspended so that the plane of the heater is parallel to the planar nozzle aperture. The bubble forming chamber receives printing fluid at an ambient temperature, and energy is applied to the heater element through the electrodes to form a gas bubble that encircles at least some of the heater element, and cause a drop of the printing fluid to eject through the nozzle, the energy applied to the heater element being less than the energy required to heat a volume of the printing fluid equal to the volume of the drop, from ambient temperature to the boiling point of the printing fluid. The flat bubble formed by a planar suspended heater is energy efficient and generates a relatively broad flat impulse in the ink for better drop directionality.
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