| 摘要 |
1,011,487. Electromechanical delay lines. INTERNATIONAL BUSINESS MACHINES CORPORATION. May 6, 1963 [May 7, 1962], No. 17738/63. Heading H3U. A transducer for a torsional-mode electromechanical delay line 15 comprises a pair of magnetostrictive strips 11, 13 which undergo longitudinal stresses of opposite sign upon application of a signal pulse to winding 19 whereby a twisting force is applied to the line 15. The strips 11, 13 are biased in opposite directions by a magnetic field which extends around a closed circuit of entirely magnetic material. As shown, the field is provided by magnets 23, 25. In a modification, a single magnet is provided and the delay line provides the return magnetic path. In another modification, the strips are permanently magnetized and are joined together at their ends remote from the delay line. The field causes either an expansion or a contraction of both strips. The signal field, which is in the same direction in the two strips, increases the contraction or expansion in one strip and decreases it in the other. The single winding shown may be replaced by two series windings one on each strip. The ends of the strips extend through a container 17 of damping material. The delay line may have a flat spiral configuration and the output transducer may be similar to the input transducer. |
