| 摘要 |
PURPOSE:To offer a small-sized two-way or nondirectional transmitter excellent in high power characteristic in a low frequency band by providing a two-stage displacement enlarging mechanism to said transmitter. CONSTITUTION:An active columnar body 1 is excited for the vertical vibration. Displacement directions of active columnar bodies 2 and 3 are different from that of the body 1. Hinges 12 and 12' and 13 and 13' are so designed that they can have the rigidity enough to effectively transmit the vertical vibration of the columnar body to a lever 14 and will not inhibit the rotation of the lever 14. When the columnar body 1 and those 2 and 3 are displaced by xsi and -xsi1, respectively, the lever 14 rotates inside to develop an enlarged displacement xsi2 at ends P and P'. When the lever 14 rotates inside, each hinge also develops the flexible deformation. However, since the moment is canceled out due to the geometric symmetry, the columnar body 1 will not develop the flexible deformation. In terms of the 2nd stage displacement enlarging mechanism, when the displacement by xsi2 occurs at the points P and P', the displacement several times larger than the xsi2 is given as shown by the double arrows owing to the form effect of a convex shell. |
