| 摘要 |
A piezoelectric speaker has a body, a reflective cover and a lower cover so as to increase durability and generate effective sound waves. A piezoelectric speaker has a body having a bottom portion defining a throttle hole in the center and a circular sidewall in the periphery, a reflection cover over and spaced to the body, a lower cover connected to the lower plane of the body and a piezoelectric transducer element including a metal disc forming a passing hole through a part of it and a piezoelectric element attached to the metal disc. |
