| 摘要 |
PROBLEM TO BE SOLVED: To facilitate the maintenance of a magnetic mark body by magnetizing a magnetic body from the outer side of the upper part of a casing, magnetically attracting it to a permeable magnetic body and holding it in a position where a magnetic field can be generated for a travel path. SOLUTION: In a magnetic mark body 100, the upper part of a casing 140 on a cylinder is formed of a permeable magnetic body 130 and a magnetic body 150 is housed in the cylinder inner space of the casing 140. The inner space of the casing 140 houses the magnetic body 150 so that it can freely vertically move and a confirmation window 160 for viewing an inner part from outside is installed nearby the center of the upper permeable magnetic body 130. When the magnetic mark body 100 is installed in a travel path, the casing 140 housing the magnetic body 150 is buried in a road and only the upper permeable magnetic body 130 is installed to be exposed onto the road. The magnetic body 150 is magnetically attracted to the upper permeable magnetic body 130 and the magnetic field of prescribed intensity is generated on the road through the upper permeable magnetic body 130. |
