Thermal ink jet printhead with suspended beam heater

Details Thermal ink jet printhead with suspended beam heater Thermal ink jet printhead with suspended beam heater

B - Operations, Transporting

41

J

B41J 2/05 (2006.01) B41J 2/14 (2006.01) B41J 2/16 (2006.01)

Patent

CA 2506701

There is disclosed an ink jet printhead which comprises a plurality of nozzles (3) and one or more heater elements (10) corresponding to each nozzle. Each heater element is configured to heat a bubble (12) forming liquid in the printhead to a temperature above its boiling point to form a gas bubble therein. The generation of the bubble causes the ejection of a drop (16) of an ejectable liquid (such as ink) through respective corresponding nozzle, to effect printing. Each heater element is in the form of a beam suspended over at least a portion of the bubble forming liquid so as to be in thermal contact therewith. This configuration of printhead provides for a relatively high efficiency of operation.

L'invention concerne une tête d'imprimante à jet d'encre comprenant une pluralité de buses (3) et un ou plusieurs éléments de chauffage (10) correspondant à chaque buse. Chaque élément de chauffage est configuré pour chauffer un liquide formant une bulle (12) dans la tête d'imprimante à une température supérieure à son point d'ébullition, de manière à former une bulle gazeuse. La formation de la bulle provoque l'éjection d'une goutte (16) de liquide éjectable (de l'encre par exemple) à travers la buse correspondante, de manière à effectuer l'impression. Chaque élément de chauffage se présente sous la forme d'un faisceau suspendu au-dessus d'au moins une portion de liquide formant la bulle, de manière à être en contact thermique avec celle-ci. La configuration de la tête d'impression permet d'avoir un fonctionnement à rendement relativement élevé.

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