| 摘要 |
PURPOSE:To ensure the proper aiming, by obtaining a region formed by a gathering of spots having the luminous intensity higher than that of a prescribed ratio and deciding the centroid point of the gathering of those mass spots in the above-mentioned region. CONSTITUTION:An automobile front lamp HL, i.e., a subject of measurement is set opposite exactly to a tester and switched on so that a lamp axis LL passes the center L0 of a condenser lens. Then a start switch is pushed to start the collection of data based on a program. A point M of the highest luminous intensity is first decided among these data, and then the luminous intensity obtained by multiplying a prescribed ratio by the highest luminous intensity is decided. In this case, the spots having >=2,400cd luminuous intensity are detected to decide a region AR. Then the centroid point is decided for the region AR, and the axis passing the centroid point is defined as the illumination reference axis. In such way, the proper aiming is possible. |
