LucidShape-Poly Curve Systems

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1.1. IntroductionThere are two types of headlamps in automotive lighting: free form reflectors and projector type headlamps(also called Poly Curve Sstems). Nowadays the latter ones are widely used, especially in the higher classcars. The advantage of these headlamps is to build systems with smaller spatial dimensions. Hence they caneasily be used in so called AFS lamps (advanced front lighting systems).

1.2. The concept of Poly Curve SystemsThe poly curve system is mainly build up by a reflector, a shield, a light source and an aspherical lens. Thefilament of the lamp is positioned in the first focus of the reflector and the shield in the second. The shieldserves as an absorber, i.e. only rays above the shield reaches the lens thus forming a cutoff line in the shapeof the shield. This way, different types of low beampatterns can be achieved according to ECE or SAE regula-tions, respectively.

The lens can be created using the create projector lens dialog box. The reflector can becreatedwith different predefined configurations. It is also possible to create various LED reflector applicationsusing this tool. To design projection systems, it is sometimes necessary to use different lens types. Therefore"PCS Projector Lens" offers the possibility to create seven different lenses such as aspherical lens, free formFresnel lens, rotational lens, rectangular lens, elliptical and spherical shaped lens and finally TIR lens, whichuses total internal reflection. The reflector can be createdwith different applications: "Poly Ellipsoid Basics","Poly Ellipsoid Advanced", or "Poly Ellipsoid Complete".