The reflective principle of bicycle taillights



The reflective principle of bicycle taillights is mainly based on the phenomenon of ‌retro-reflection‌ or ‌total reflection‌ of light, which is specifically achieved through the corner reflector inside the taillight. This corner reflector is composed of multiple small reflective surfaces, usually in the shape of right-angle cones, which can reflect the incident light back along the original path, no matter from which angle the light enters. ‌


Specifically, when the light of a car is directed at the bicycle taillight from behind, the light will be reflected back in the opposite direction by the right-angle cone reflective surface inside the taillight, forming a bright light spot, thereby reminding the driver to pay attention to the bicycle in front. This reflection method makes bicycles easier to be found at night and improves the safety of riding. ‌


In addition, bicycle taillights are mostly red plastic covers with a flat outer surface and many protruding right-angle cones on the inner wall. This design not only has good reflective properties, but also can be molded by plastic injection molding in one time, which is low in cost. ‌


In summary, the reflective principle of bicycle taillights is retro-reflection or total reflection, and the light is returned along the original path through the corner reflector inside the taillight, which improves the safety of night riding.

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