| 摘要 |
A carrier frame having an aperture and a nozzle plate disposed on the carrier frame and positioned over the aperture is described. The nozzle plate has at least one nozzle formed between opposing surfaces of the nozzle plate. The carrier frame and the nozzle plate are made from materials having dissimilar thermal expansion coefficients such that the carrier frame has a thermal expansion coefficient that is less than the thermal expansion coefficient of the nozzle plate. The nozzle plate is staked to the carrier frame and then baked so that the nozzle plate shrinks during the baking process thereby becoming taught and under a state of tensile stress. The nozzle is formed in the nozzle plate after the baking process by laser ablation, for example. The nozzle thus formed has a true bore due to the taught nozzle plate and the opposed surfaces of the nozzle plate being parallel to each other. Consequently, a nozzle camber angle measured relative to a nozzle axis and defined by an angular displacement between a center point of symmetry on an input side of the nozzle and a center point of symmetry on an output side of the nozzle is coaxially aligned with the nozzle axis. By eliminating dimples in the nozzle plate, the nozzle has sidewall surfaces that are symmetric with respect to the nozzle axis thereby defining a nozzle with a true bore. An ink drop injected into the nozzle by an ink jet printhead mounted to the nozzle plate and having a firing chamber in fluid communication with the nozzle will exit the nozzle in a direction that is aligned with the nozzle camber angle such that the drop directionality of the ink drop is improved by true bore of the nozzle.
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