| 摘要 |
928,189. Magnetostrictive vibrators. INTERNATIONAL BUSINESS MACHINES CORPORATION. Feb. 19, 1962 [March 18, 1961], No. 6334/62. Class 40 (4). A half-wave resonator rod 3 clamped at its central node 4 is excited by a magnetic field which decreases in intensity away from the node, preferably in accordance with a sine function. In Fig. 2, a single layer coil 6 increases in pitch angle away from the centre of the rod. In Fig. 3, there are a number of coils 7 . . . 10 of different length. In Fig. 4 a single coil 11 is of increasing diameter away from the centre of the rod. The invention is applicable to a quarter-wave resonator not clamped at the centre. |
