| 摘要 |
An ink jet nozzle assembly includes a nozzle chamber having an inlet receiving fluid from a reservoir and a nozzle through which ink is ejected. The chamber includes a fixed portion, a movable portion and a clearance space. Relative movement between the fixed portion and the movable portion in an ejection phase reduces an effective volume of the chamber. Alternative relative movement in a refill phase enlarges the effective volume of the chamber. The clearance space contains an air-ink interface, surface tension in ink across a meniscus at the interface forms a fluidic seal between the chamber and the atmosphere. The clearance space, nozzle and the ink being dimensioned relative to one another such that ink is ejected preferentially from the chamber through the nozzle in droplet form in the ejection phase, and ink is alternately drawn preferentially into the chamber from the reservoir through the inlet in the refill phase without the fluidic seal breaking.
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