| 摘要 |
PURPOSE:To pick up ringing oscillation with fidelity by sticking piezoelevtric elements at the outer and inner side planes of a pedestal provided to fix a diaphragm on the frame of a musical box. CONSTITUTION:The piezoelectric element 6 is stuck on the side plane of the pedestal 4' provided to fix the diaphragm 3 on the frame of the musical box. Namely, the tensile stress side of the pedestal 4' is recessed according to a Poisson's ratio, while, the compressive stress side is expanded, and those generation stresses are conformed to the deflection quantity of the diaphragm, and it is set at a state equivalent to the state where the oscillation is detected by directly sticking the piezoelectric element. Thereby, the ringing oscillation of the musical box can be picked up with fidelity and inexpensively. |
