At application of "pillow optics" for signal automotive lights some natural contradiction can occur between official
requirement for angular distribution of Intensity (the beam should have rectangular form) and real light Intensity
pattern radiated, which usually has circular or oval shape. This oval area should be bigger, than needed a rectangular
pattern. Significant portion of the light misses target area; and this light is lost in such cases. Some other shape of
surface is proposed for pillow optics to improve light pattern.
At application of "pillow optics" for various lenses a problem of non-uniform distribution of output light can be faced. Even if input light from the source (i.e. before the lens) is a uniform parallel beam, the output light will not be uniform: Intensity is higher for central angles than for outlying angles. It takes place due to geometry of spherical pillows. To improve angular uniformity of output light, the other kind of pillow geometry can be applied instead of spherical geometry.
The methods of optimization for illumination optical systems with application of Total Internal Reflection are considered. The problem of optimization includes: a) the optimal values of the angles for reflecting triangles in order to have maximum efficiency; b) the calculations of the angles for the case of both primary light (from the bulb) and secondary light (from the reflector). Developed methods can be applicable for automotive lamps, aviation lighting and any other illumination systems.
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