High efficiency thermal ink jet printhead

B - Operations – Transporting – 41 – J

Patent

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Details

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

Patent

CA 2506731

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 (3). Each heater element is configured to heat a bubble forming liquid in the printhead to a temperature above its boiling point to form a gas bubble (12) therein. The generation of the bubble causes the ejection of a drop of an ejectable liquid (such as ink) through the respective corresponding nozzle, to effect printing. Each heater element is configured such that an actuation energy of less than 500 nanojoules (nJ) is required to be applied to that element to heat it sufficiently to form such a bubble (12) in the bubble forming liquid (which liquid can also be the ink). This configuration thus provides for a high efficiency printhead.

L'invention concerne une tête d'impression à jet d'encre comprenant une pluralité de buses (3) et au moins un élément chauffant (10) correspondant à chaque buse (3). Chaque élément chauffant est destiné à chauffer une bulle formant du liquide dans la tête d'impression à une température supérieure au point d'ébullition pour y former une bulle de gaz (12). La génération de la bulle provoque l'éjection d'une goutte d'un liquide éjectable (tel que l'encre) par la buse correspondante pour réaliser l'impression. Chaque élément chauffant est conçu de telle manière qu'une énergie d'actionnement inférieure à 500 nanojoules (nJ) est nécessaire à cet élément pour le chauffer suffisamment pour former une telle bulle (12) dans la bulle formant le liquide (ce liquide pouvant également être l'encre). Cette configuration permet d'obtenir une tête d'impression hautement efficace.

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