The answer is that there is a little disk or square of piezo material glued to the inside of the watch back. The light weight scaling tip - the part that actually touches your teeth - screws onto the threaded tip and is set into "wild" vibration by the piezo’s motion.ĭid you ever wonder how the sound of the watch beeper gets out of the watch without any holes? OK, so maybe not. They are stacked 4, and sometimes 6, deep and wired up so that all of their individual motions work in unison, adding up to much larger motion and power. The tooth plaque scaler that your hygienist uses looks like this inside. In order to get to this usable state the raw fired piezo has to be cut to shape, have the electrodes applied to its surface, and THEN it has to be polarized by applying a very high voltage to its electrodes. This is perhaps the most commonly appearing form applied in medical ultrasound transducers (fetal heart rate monitors, some imaging, physical therapy devices, etc), ultrasonic cleaners, NDT (non destructive testing) probes, etc. At this stage it does not exhibit piezoelectric properties.Ī simple disk of piezo with silver electrodes on both major faces. It's a ceramic, fired in a kiln (like a flowerpot), so it's brittle, shatters when dropped, and it's not very flexible. You can scroll through, or click directly on the table of contents: Block of Piezoįirst: this is a block of piezo as it appears right after it's fired. Rather than beat you up with a lot of descriptions, here is a really instructive set of photos with a little description about what each one does.
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