| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a metal detecting coil capable of extremely easy and rapid inspection by providing an interior of an opening of the metal detecting coil with an almost uniform detection sensitivity for enhancing sensitivity inside the opening and effectively using the interior of the opening. SOLUTION: This metal detecting coil is provided with a protruding part with a shape changed in accordance with a change of detection sensitivity inside an opening.</p> |
