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This paper describes a new headlamp design evaluation and simulation program that provides greater freedom and improved efficiency in light distribution design, using either concave or convex lens and a reflector with a NURBS (Non-Uniform Rational B-Spline Surface), for one of its free surfaces. It also offers simulation results of light distribution designs using this program in order to produce various headlamps, including high-efficiency and flat headlamps, each with a concave lens, and a thin headlamp with a convex lens.

A system has been developed that makes it possible to design headlamps having an ideal light distribution pattern. Using multi B-spline surfaces (MBSS) for the reflector and dual filament (c-8/c-8) for the light source, the shape and the light distribution pattern it generates are computer simulated. The characteristics of the light distribution are analyzed and, using a neural network, the reflector is partitioned. Each surface is continuously modified so as to obtain the optimum light distribution pattern.

A system has been completed that makes it possible to design headlamps having an ideal light distribution pattern. Using multi B-spline surfaces (MBSS) for the reflector, the shape and the light distribution pattern it generates are computer-simulated. The characteristics of the light distribution are analyzed, and using a neural network the reflector is partitioned. Each surface is continuously modified so as to obtain the optimum light distribution pattern.

We have completed a system that can evaluate light distribution in real time as you view the screen, using computerized vehicle simulation graphic analysis of the light distribution pattern of headlamp used in automobiles. The system is able to generate a composite evaluation using the practical application of multi-fuzzy inference forms that include peripheral field of vision, calculating the unevenness of the light distribution on the road surface as well as the luminous flux (both emitted and reflected back) that illuminates the road, sidewalk and wall, at the same time evaluating the quantified data of disability glare, discomfort glare and contrast in relation to the visibility of the target (pedestrian, road delineation lines, fallen objects on the road) and adding glare from an oncoming vehicle and background brightness (of the sky, road surface, wall).

We have developed a light distribution evaluation system capable of analyzing automobile headlamp light distribution patterns, on-screen, by implementing computerized vehicle simulation graphic analysis. This system enables one to comprehensively evaluate the driver's vision, including peripheral vision, by analyzing quantified data on contrast, discomfort glare, and disability glare effecting target visibility (ie. of pedestrian and delineation lines), adding in background brightness (ie. of sky, road, and guard fence) and oncoming vehicle glare, and arranging the screen to be at the driving viewing angle to be analyzed. Also, the video screen brightness is adjusted to look more like actual outdoor conditions by using real data, gathered outdoors, as a basis of calculation. The road lines are given in compound curvature in the vertical and in the horizontal dimensions.