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Traveling Wave Exciter for Ink Jet Print Head

IP.com Disclosure Number: IPCOM000042099D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Fillmore, GL: AUTHOR [+2]

Abstract

The piezoelectric (PZT) drive element in an ink jet is divided into multiple elements that may be sequentially excited. If the excitation of each PZT element is timed properly, a pressure wave traveling towards the nozzle in the excitation cavity will build up its energy as it passes under each PZT element. The PZT element in the squeeze-tube version of a drop-on-demand drop generator has one electrode on the outer surface and another on the inner surface. When a voltage difference is placed across these electrodes, the entire PZT, which has been poled radially, undergoes a radial expansion or contraction depending on the polarity of the voltage. Consider the case when the outer electrode is broken up into a series of bands, as shown in Fig. 1.

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Traveling Wave Exciter for Ink Jet Print Head

The piezoelectric (PZT) drive element in an ink jet is divided into multiple elements that may be sequentially excited. If the excitation of each PZT element is timed properly, a pressure wave traveling towards the nozzle in the excitation cavity will build up its energy as it passes under each PZT element. The PZT element in the squeeze-tube version of a drop-on-demand drop generator has one electrode on the outer surface and another on the inner surface. When a voltage difference is placed across these electrodes, the entire PZT, which has been poled radially, undergoes a radial expansion or contraction depending on the polarity of the voltage. Consider the case when the outer electrode is broken up into a series of bands, as shown in Fig. 1. If a voltage is applied between the continuous inner conductor and one of the bands, the radius of the PZT will change in the region of the band. Fig. 2A, which shows the PZT as part of the fluid channel, depicts the case at t=0+ after the region around the first band has just contracted. This high pressure region directly under the band will propagate in both directions. At a later time, the situation will appear as in Fig. 2B. If a voltage is applied to the second band at the time when the rightward traveling pulse from the first band is directly under the second band, a higher amplitude rightward traveling pulse will result. When this pulse arrives at band 3, as shown in Fig...