Piezoelectric Ink Jet

There are two types of impulse printers (Eig. 19). A piezoelectric ink jet propels a drop by flexing one or more walls of the firing chamber to decrease rapidly the volume of the firing chamber. This causes a pressure pulse and forces out a drop of ink. The flexing wall is either a piezoelectric crystal or a diaphragm driven by a piezoelectric incorporated into the firing chamber (Eig. 19a). Thermal impulse ink jets also propel one drop at a time, but these use rapid bubble formation to force part of the ink in a firing chamber out the orifice (Eig. 19b). 

Fig. 19. Ink-jet system (a) piezoelectric ink-jet firing chamber and (b) bubble formation ia thermal ink-jet technology.

Chip fabrication Probes are placed on the chip by means of photolithography, pipetting, drop-touch, or piezoelectric (ink-jet). 

Droplet generator Piezoelectric drop on demand Piezoelectric ink jet Piezoelectric micro-/ nanoliter droplet dispenser... 

In the mid-1970s the piezoelectric ink-jet (PIJ) DoD system was developed (Figure 3(c)). The first piezoelectric DoD printer on the market was the serial character printer Siemens PT80 in 1977. Generally, four different modes for droplet generation by means of a piezoelectnc device were developed squeeze, bend, push, and shear. 

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