| 摘要 |
<p>PROBLEM TO BE SOLVED: To make high-precision detection possible by penetrating a supporting shaft into an inserting hole of an indicating board provided with a detecting element, and making the indicating board swayable upwards and downwards, right and left by the clearance between the inserting hole and the supporting shaft. SOLUTION: An indicating board P is supported approximately vertically in a storage case A so as to be swayable both vertically and horizontally by the clearance between an inserting hole 16 and a supporting shaft 19. Consequently, the supported condition is stabilized. Besides, the breadth of swaying of the indicating board P becomes larger, and the range of detection becomes wider. Here, if the horizontal deflection of the indicating board P is regulated by providing touching sections 3 on both sides of the indicating board P in the storage case A, and bringing the indicating board P into contact with the touching sections B, or if the vertical deflection of the indicating board P is regulated by providing a protrusion 17 on the side surface of the indicating board P, and bringing the protrusion 17 into contact with the touching sections 3, the range of swaying of the detecting element is kept within a concealed-in- a-wall substance detectable range, and it becomes possible to detect a concealed-in- a-wall substance even if the detecting element M is at any position.</p> |
