H - Electricity – 04 – R
Patent
H - Electricity
04
R
349/66, 349/67.2
H04R 17/02 (2006.01) H01L 41/04 (2006.01) H04R 17/00 (2006.01)
Patent
CA 1066798
ABSTRACT OF THE DISCLOSURE A vibration detecting device adapted to be mounted on a musical instrument, such as a guitar or a violin, or a mechanical conversion apparatus for detecting sound generated by the guitar or the like or other vibration is provided, which is of simple structure having a piezoelectric ceramic plate housed in a case, and has a high sensitivity and an excellent frequency characteristic. The device comprises at least one piezoelectric ceramic plate having electrodes on both operative surfaces thereof, a case housing said piezoelectric ceramic plate and having a surface for receiving vibrations to be detected, an accoustic coupling medium interleaved between the case and the operative surfaces of said piezoelectric plate and said case, said medium extending generally parallel to said surfaces so as to couple them accoustically to the vibration receiving surface of said case and said coupling medium comprising a vibration damping material adapted to damp high frequency vibrations through said case to said plate to suppress unfavourable resonances in the high frequency regions and flatten the frequency characteristic in the low frequency region.
233672
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