角锥单元倾斜角和拼接结构对逆反射效率的影响

Influence of Inclination Angle and Splicing Structure of Cube-Corner Reflector Element on Retroreflection Efficiency

微棱镜型反光膜存在着有效入射角范围小(广角性)和不同方位角的逆反射效率相差大(方向各异性)的问题,解决上述问题较为简单的方法是改变角锥(CCR)单元倾斜角和采用拼接结构。基于几何光学原理,使用光线追踪软件计算了不同结构的CCR阵列。基于微棱镜反光膜的逆反射原理,分析了CCR单元的倾斜角度、入射光角度和拼接结构对逆反射效率的影响。结果表明,当使用倾斜CCR阵列时,方位角0°方向的逆反射效率提高了20个百分点以上。采用不同倾斜角拼接结构后,不同方向逆反射效率的最大偏差降低了10%以上。将CCR阵列倾斜角的仿真结果与反光膜的亮度测试结果进行对比,发现逆反射效率的变化趋势一致,证实了仿真模型的可靠性。以上研究结果可用于微棱镜反光膜的结构设计和优化。

Microprism reflector films are limited by various factors,such as a narrow range of effective incidence angles(wide angle)and large difference in retroreflection efficiency at different azimuth angles(different directions).These limitations can be resolved by changing the inclination angle of the cube-corner reflector(CCR)element and using the splicing structure.In this study,CCR arrays with different structures are calculated using the ray-tracing software based on the principle of geometrical optics.Herein,the influence of the inclination angle of the CCR element,angle of the incident light,and the splicing structure on the retroreflection efficiency is analyzed using the retroreflection principle of microprism reflective films.The results show that the retroreflective efficiency in the azimuth 0°direction increases by more than 20 percentage points when using a inclination angle CCR array.Furthermore,the maximum deviation of the retroreflective efficiency in different directions reduces by more than 10% after adopting a spliced structure with different inclination angles.The simulation results of the inclination angle of CCR arrays are compared with rightness test results of the reflective film,and the variation trend of the retroreflective efficiency is found to be consistent,confirming the reliability of the simulation model.These research results can be used in the structural design and optimization of microprism reflective films.