| 摘要 |
PROBLEM TO BE SOLVED: To widen the band of a bolting Langevin type transmitter receiver by lowering the frequency while securing a fixed or higher level of sound pressure without varying the external size of the transmitter receiver. SOLUTION: The transmitter receiver 1a is equipped with a Langevin type vibrator 3 having a front mass 6, a rear mass 7, and a cylindrical active vibrator 9 sandwiched between the front mass 6 and rear mass 7 and a bending vibrator 2 comprising a diaphragm 5 arranged on the rear mass 6 of the Langevin type vibrator 3 on the side of a sound radiation surface and a disklike active vibrator 4 fixed to the diaphragm 5. The front mass 6 of the Langevin type vibrator 3 has a slit 50, communicating with the axial center side from the outer peripheral flank, on the circumference of the lower side on the side of the rear mass. COPYRIGHT: (C)2006,JPO&NCIPI
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