| 摘要 |
<p>A vertical geophone that includes a lower frequency spring, which forms part of the gcophone electrical circuit, that is positioned directly on the lower end cap This arrangement eliminates the "'spring supported by a spring'" arrangement of prior art geophones to minimize geophone distortion and simplify tuning of the frequency springs. A contact spring is positioned between the lower frequency spring and the lower pole piece for forming part of the geophone electrical circuit. One surface of contact spring includes a plurality of wiper surfaces that ensure consistent sliding electrical contact against either the bottom surface of the lower pole piece or the upper surface of the lower frequency spring. The obverse surface of the contact spring is preferably spot welded to the other adjacent member.</p> |
