| 摘要 |
A multicolor ink jet printhead for use in a continuous stream ink jet printing system is disclosed. Each ink emitting nozzle is supplied from a separate ink reservoir under a predetermined pressure to an associated inlet in a common droplet generator. A means of passage is provided from the inlet of the droplet generator to a respective nozzle through a medium in the droplet generator resonance cavity. The passage means maintaining the separation of the various colored inks from the cavity medium, the passage means being relatively impedance matched when the cavity medium is liquid or a solid. Therefore, a single acoustic driver and droplet generator may be used for perturbating the different colored inks emitted from the nozzles thereof. In one embodiment, each of the multicolored streams of ink droplets emitted from the nozzles are fanned in a direction perpendicular to the translation direction of the printhead, so that a swath of information is printed on a stationary but steppable recording medium. A translation of the printhead enables superimposed printing to effect composite colors or halftone shaded patterns. In another embodiment, the recording medium is in the form of cut sheets and mounted on a rotatable drum so that groups of nozzles emitting the same colored ink may be used with the ink droplets fanned in a direction parallel with the printhead translation, resulting in wider bands of information being produced in a "barber pole" fashion on the recording medium.
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