| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus for detecting and recovering a needle-shape magnetic metal body, in which a detecting efficiency and reliability are high; and to quickly detect and recover the needle-shape magnetic metal body with simple operation.SOLUTION: The present invention has an obliquely directed interdigital electrode or a tape-shape dipole electrode spiral structure having a function of quickly recovering a needle-like magnetic metal body with a magnetic force of a columnar permanent magnet laminate, and at the same time of selectively detecting only the needle-like magnetic metal body without erroneous operation due to electrolyte or magnetic powder present in a floor surface when losing the needle-like magnetic metal body on the floor, and further has a function of informing detection of detected signals by sound, light, or vibration with an amplifying circuit and an analyzing circuit. |
