| 摘要 |
PURPOSE:To measure the irradiation direction of a passing-by beam by calculating the irradiation direction from the position of a light/shade boundary line when a light distribution has the boundary line, and finding the irradiation direction from the upper end and lower end of a high-luminous-intensity zone when the light distribution has no boundary line. CONSTITUTION:The detection device consists of the 1st photodetecting element plate which has photodetecting element arrays P1-Pn and Q1-Qn, the 2nd photodetecting element plate which has split photodetecting elements a1-a4, an analog multiplexer mpx, a microprocessor mpu, a display panel DP, etc. Then, it is decided firstly whether the light distribution of headlights to be measured has a light/shade boundary line or not and when so, the irradiation direction is calculated from the position of the boundary line. When the light distribution has no boundary line, the light distribution is considered to has the high-luminous-intensity zone to find where the ratios of the luminous intensity and maximum luminous intensity at the upper and right ends of the high- luminous-intensity zone coincide with preset values, thereby calculating the irradiation direction. |
