Seal for a micro electro-mechanical liquid chamber

B - Operations – Transporting – 41 – J

Patent

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Details

B41J 2/045 (2006.01) B41J 2/14 (2006.01) B81B 3/00 (2006.01) B81B 7/02 (2006.01)

Patent

CA 2414722

A micro electro-mechanical device for ink jet printers has a liquid-containing nozzle chamber (12) and a movable component (20, 22) [thermal actuator structure] extending into the chamber. Difficulties exist in sealing such a device against movement of the liquid through an opening through which the actuator extends. This difficulty is resolved by shaping the actuator (20, 22) in such a way as to induce the formation and maintenance between the wall of the chamber and the actuator (20, 22). The first portion (20) of the actuator is located substantially within the nozzle chamber and the second portion (22) is located outside the nozzle chamber. The stem portion (26) of the second portion (22) is connected by a shoulder (28) to an end portion (30) of the first actuator portion (20). A meniscus formed between the step (26) and the outer edges (36) forms a seal preventing liquid from inside the chamber to leak through.

L'invention concerne un dispositif micro électromécanique pour des imprimantes à jet d'encre comportant une chambre (12) d'ajutage contenant du liquide et des éléments (20, 22) mobiles [structure d'actionneur thermique] s'étendant dans la chambre. Des difficultés existent lors de l'étanchéification d'un tel dispositif, contre le mouvement du liquide, à travers une ouverture à travers laquelle l'actionneur s'étend. Cette difficulté est résolue par formation de l'actionneur (20, 22) de manière à induire la formation et la maintenance entre la paroi de la chambre et l'actionneur (20, 22). La première partie (20) de l'actionneur est placée sensiblement à l'intérieur de la chambre d'ajutage et la seconde partie (22) est placée hors de celle-ci. La partie tige (26) de la seconde partie (22) est connectée par une épaule (28) à une partie terminale (30) de la première partie (20) de l'actionneur. Un ménisque formé entre la tige (26) et les bords extérieurs (36) forme une étanchéité empêchant des fuites du liquide se trouvant à l'intérieur de la chambre.

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