| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a handy type surveying device with simple constitution cheaply, which can survey a metal piece and an object including metal piece in the state that the direction to the surveying metal piece is indicated. SOLUTION: A magnet Mg is held with a holder 22 supported freely movably by a support device 2 suspended in a mechanical box. To the holder 22, a reflection mirror 23 movable together with it is fixed. An optical sensor 3 sensing and operating by receiving a light beam projecting from a projection part with a reception part is fixed in the mechanical box 1 so that the light projected from the projection part forwards the mirror surface of the reflection mirror 23 held by the holder 22.</p> |
