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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.