Patent ID: 8714005

Claim:
A downhole tool comprising: a tool housing; and an acoustic transducer on the tool housing comprising: an annular housing; a cap set over an end of the annular housing; a piezoelectric member disposed within the annular housing and having an upper end facing the cap and a lower end; a coupling having an upper end supported on an end of the piezoelectric member proximate the cap and a flange portion coupled with the upper end that is disposed between the upper and lower ends of the piezoelectric member; and an annular piezoelectric tube circumscribing the coupling and having an end on the flange portion, so that when an electrical potential is provided to the piezoelectric member and piezoelectric tube, the piezoelectric member and piezoelectric tube expand and contract and the piezoelectric tube is displaced an amount substantially equal to expansion of the piezoelectric member and piezoelectric tube.