Thermal bend actuator comprising bent active beam having...

B - Operations – Transporting – 41 – J

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B41J 2/045 (2006.01)

Patent

CA 2719106

A thermal bend actuator comprising: (a) a pair of electrical contacts positioned at one end of the actuator; (b) an active beam connected to the electrical contacts and extending longitudinally away from the contacts, the active beam defining a bent current flow path between the contacts; and (c) a passive beam fused to the active beam. When a current is passed through the active beam, the active beam heats and expands relative to the passive beam, resulting in bending of the actuator. The active beam comprises a resistive heating bar having a relatively smaller cross-sectional area than any other part of the current flow path. Heating of the active beam is concentrated in the heating bar. Image

L'invention porte sur un actionneur à flexion thermique, comprenant : (a) une paire de contacts électriques positionnés à une extrémité de l'actionneur ; (b) une poutre active connectée aux contacts électriques et s'étendant longitudinalement à partir des contacts, la poutre active définissant un trajet incurvé de circulation de courant entre les contacts ; et (c) une poutre passive fusionnée avec la poutre active. Lorsque l'on fait circuler un courant à travers la poutre active, la poutre active chauffe et se dilate par rapport à la poutre passive, produisant en résultat une flexion de l'actionneur. La poutre active comprend une barre chauffante résistive ayant une surface de section transversale relativement plus petite que toute autre partie du trajet de circulation de courant. Le chauffage de la poutre active est concentré dans la barre chauffante.

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