Recorders – Markers and/or driving means therefor – With ink supply to marker
Patent
1990-11-20
1993-04-13
Fuller, Benjamin R.
Recorders
Markers and/or driving means therefor
With ink supply to marker
B41J 2045
Patent
active
052027031
ABSTRACT:
In the representative embodiments of the invention described herein, a transducer for an ink jet system includes a piezoelectric element with an array of spaced interdigitated electrodes on one side of the element. One embodiment includes two such arrays disposed near the sides of the ink jet chamber and another array of interdigitated electrodes on the opposite side of the transducer in the central region of the ink jet chamber. In that embodiment, continuous electrodes are provided on the surfaces of the transducer opposite to the surfaces bearing the interdigitated arrays. Alternate electrodes in each array and the continuous electrode on the opposite side are grounded and positive or negative potential is applied to the other electrodes in the arrays to produce deflection of the transducer element and alternate pulses of opposite polarity may be applied to polarize the piezoelectric element in opposite directions with each pulse. Using a transducer thickness of about 4 microns, 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.
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patent: 4584590 (1986-04-01), Fischbeck et al.
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patent: 4879568 (1989-11-01), Bartky et al.
patent: 4901092 (1990-02-01), Moriyama
Hoisington Paul A.
Paulson Bruce A.
Bobb Alrick
Fuller Benjamin R.
Spectra Inc.
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