Keeping a proper thickness of the conductive silver layer on the electrode is important. The solder joint can come off if the conductive layer is too thin.

In addition, meeting the dimension tolerance requirements is critical for proper lens cover vibration performance. The transducer must meet tolerances for the best performance. Failure to meet the dimensional tolerance requirements can have the following consequences:

1. Significantly increase the impedance magnitude of the desired vibration modes, and raise the power consumption.
2. Reduced vibration level which results in reduced cleaning performance.