Computer aided design of free from reflector

Segmented reflectors are widely used in modern vehicle lamps. Such lamps have many advantages. However, they are difficult to design. Currently the Chinese vehicle lamp industry does not have a good CAD tool for the design of such lamps. Research is conducted for the design theory and algorithm for free form reflector illumination systems. The algorithm uses segmented reflectors made up of uniform B-spline surfaces in order to meet the specified illumination requests on different positions of the test screen. It can automatically generate shape points through ray tracing. Then it uses these shape points to calculate the control points of the surfaces. Constraints are added to make the adjacent segments connect smoothly with each other, and this solves a tough problem in the design of segmented reflectors.