| 摘要 |
<p>PROBLEM TO BE SOLVED: To perform rapid and simple arrangement as regulation is effected so that transmission and receipt of light are effected with maximum efficiency when a light beacon head-mounted apparatus is arranged on a slope. SOLUTION: A placing bed 5 engaged with the back 11c of a case 11 and sliding over is provided, and a rotatable standard 8 is hung down from the case 11. On the surface in the direction of width of the standard 8 and on the case 11, the light beacon 10 is placed on a horizontal plane H. Belt-like marks 8a and 11a linearly arranged when the case 11 (a base plate 4) is pointed to an apparatus on a road in a direction in which maximum transmission receipt efficiency is obtained are formed. When the light beacon had 10 is placed on a slope S, the standard 8 is hung down from the case 11 in a constantly specified attitude under gravity but, since the case 11 is inclined togetherwith the placing bed 5, the marks 8a and 11a are arranged in a displaced state. By restoring the marks 8a and 11a to a state that the marks are linearly arranged, the case 11 is pointed to an optimum direction.</p> |
