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. Author manuscript; available in PMC: 2012 Jan 23.
Published in final edited form as: Ultrason Imaging. 2011 Jul;33(3):197–204. doi: 10.1177/016173461103300304

Figure 2.

Figure 2

A schematic of the steps to building the ring array transducers. We start with a metallized polyimide substrate (figure 2A) with an area without the metal to attach the PZT. We next attach the PZT beam (figure 2B) with non-conductive epoxy. After the epoxy cures, silver paint is used to connect the back electrode of the PZT with the metal trace (figure 2C). The PZT is then diced, and wrapped around a lumen. A 0.012 mm thick layer of liquid crystal polymer (LCP) is wrapped around the outer circumference of the PZT and polyimide substrate (figure 2D). This LCP layer is metallized with gold (shown in black) on one side only, the outer side, so that it does not risk shorting the traces together. A layer of gold is sputtered on the face of the elements and connected to the gold on the outside of the LCP (figure 2E).