B - Operations – Transporting – 41 – J
Patent
B - Operations, Transporting
41
J
B41J 2/045 (2006.01) B41J 2/14 (2006.01)
Patent
CA 2055835
In the representative embodiments of the inven- tion described herein, a transducer (25) for an ink jet system includes a piezoelectric element (26) with an array of spaced interdigitated electrodes (12,13) on one side of the element. One embodiment includes two such arrays (27) disposed near the sides of the ink jet chamber and another array (28) of interdigi- tated electrodes (12,13) on the opposite side of the transducer in the central region of the ink jet cham- ber (20). In that embodiment, continuous electrodes (29,30) are provided on the surfaces of the transducer opposite to the surfaces bearing the interdigitated arrays (27,28). Alternate electrodes (12,13) in each array and the continuous electrode (29,30) on the opposite side are grounded and positive or negative potential is applied to the other electrodes (12,13) in the arrays (29,30) to produce deflection of the transducer element (25) and alternate pulses of oppo- site polarity may be applied to polarize the piezoelectric element in opposite directions with each pulse. Using a transducer thickness of about 4 mi- crons, ejection of a drop of given size with a given voltage pulse can be achieved with a chamber volume which is one-twentieth to one-fortieth the size of the chamber volume required for conventional transducer arrangements.
Hoisington Paul A.
Paulson Bruce A.
Dimatix Inc.
Gowling Lafleur Henderson Llp
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