Thermoelastic inkjet actuator with heat conductive pathways

Details Thermoelastic inkjet actuator with heat conductive pathways Thermoelastic inkjet actuator with heat conductive pathways

B - Operations, Transporting

41

J

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

Patent

CA 2482060

A thermal inkjet actuator for use in an inkjet printer assembly includes heat conduction means arranged to realize a predetermined negative pressure profile to facilitate droplet formation. In a preferred embodiment the heat conduction means comprises a thin layer (54) of very high thermally conductive material such as Aluminium located in the middle of a non-heat conductive passive bend layer (56). The overall cool-down speed of the actuator, and hence the speed with which the passive bend layer returns to its quiescent position can be controlled by controlling the proximity of the heat conductive layer to the actuator's heater during fabrication.

Cet actionneur thermique de jet d'encre, utilisable dans une imprimante à jet d'encre, comporte un dispositif de conduction thermique conçu pour créer une pression négative prédéterminée afin de faciliter la formation de gouttelettes. Dans un mode de réalisation préféré, ce dispositif de conduction thermique comporte une fine couche (54) d'un matériau à conductivité thermique très élevée, de l'aluminium notamment, situé au milieu d'une couche de cambrage passive non conductrice de la chaleur (56). Il est possible de commander la vitesse globale de refroidissement de l'actionneur et, partant, la vitesse à laquelle la couche de cambrage passive revient à sa position de repos, en agissant sur la distance séparant la couche conductrice de la chaleur du générateur de chaleur de l'actionneur et ce, en cours de fabrication.

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