| 摘要 |
<p>A geophone is disclosed, that has a cylindrical housing (102) having a longitudinal axis, a cylindrical magnet assembly including a magnet (104) with pole pieces (114, 120) on both ends, top (115) and bottom (117) housing closure members for mounting said magnet assembly in the housing with its longitudinal axis along the longitudinal axis of the housing and an annular gap between the magnet assembly and the housing. A cylindrical coil form (108) is located in the annular gap and two disc-shaped springs <IMAGE></p> |
