| 摘要 |
A piezoelectric transducer adapted for adherence to a sounding board of a musical instrument. The piezoelectric crystal has electrically conductive films on each surface. The first surface film is connected to the output conductor and the entire surface adheres to the insulated surface of a conductive inertial mass that is electrically connected to the second conductor surface of the crystal and to the output conductor shield, or ground reference, to provide self-shielding of the transducer and to obviate need for an additional shielded housing. The crystal-mass combination is then preferably potted in a suitable dipping plastic to form a small inexpensive pickup unit with high quality output which may be readily attached to a vibrating surface, such as a drum or an instrument sounding board.
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