Browse Prior Art Database

Drop on Demand Ink Jet Nozzle Array with Two Nozzles/ Piezoelectric Crystal

IP.com Disclosure Number: IPCOM000051726D
Original Publication Date: 1981-Mar-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Tsao, CS: AUTHOR

Abstract

Shown above is a four-nozzle drop-on-demand ink jet head. The ink jet head is unusual in that the nozzles are paired and each pair of nozzles is driven by a single piezoelectric crystal.

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Drop on Demand Ink Jet Nozzle Array with Two Nozzles/ Piezoelectric Crystal

Shown above is a four-nozzle drop-on-demand ink jet head. The ink jet head is unusual in that the nozzles are paired and each pair of nozzles is driven by a single piezoelectric crystal.

Nozzles 1 and 2 share PZTa, and nozzles 3 and 4 share PZTb. The two PZTs are driven by voltages Va and Vb, respectively. The operation of nozzle pair 1 and 2 is described with reference to the voltage waveform shown in Fig. 2. When Va goes positive with a high slew rate, PZTa flexes downward rapidly (Fig. 1, solid line). This causes the ejection of a drop from nozzle 2 (Fig. 1, solid drop). When Va drops slowly back to zero, PZTa relaxes slowly to its unstrained position and this causes no effect on nozzle 1. Now if Va goes negative with a high slew rate followed by a slow recovery to zero (Fig. 2, dotted line), the same mechanism applies and a drop gets ejected from nozzle 1 (Fig. 1, dotted line). Nozzles 3 and 4 operate in the same manner when PZTb is driven by Vb.

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