| 摘要 |
<p>A magnetic holder for releasably retaining a ferromagnetic object, having a core member (1) composed of a semi-hard magnetic material magnetized permanently by an instantaneous discharge current from a capacitor (6) passing in a first direction through coils (3) wound on the core member (1) to permanently retain the object. The capacitor discharge current is passed in a second direction opposite to the first through the coils (3) to demagnetize the previously magnetized core member (1) to allow the object to be magnetically released.</p> |
