微棱镜反光膜非平面状态下微结构几何结构改变对反光特性的影响

Influence of Geometry Structure of Microstructure on Reflective Characteristics of the Micro-prism Film in the Nonplanar State

为研究反光膜弯曲状态下的反光特性变化规律,基于体积不变原理建立弯曲角锥棱镜反射面二面角与弯曲角度之间的映射关系;利用光反射理论分析单个弯曲角锥棱镜与弯曲反光膜的反光特性,得出单个弯曲角锥棱镜出射光线轴对称分布规律和弯曲反光膜最大理论有效弯曲角为70.52°;最后采用光线追踪软件对单个弯曲角锥棱镜和弯曲反光膜仿真。结果表明:光线正入射单个弯曲角锥棱镜及弯曲反光膜的衍射图样为轴对称分布;弯曲反光膜的最大有效弯曲角随着弯曲角度的增加而减小,降幅0.7%,其值与理论值偏差较小;弯曲角度大于20°时,凸状反光膜的反射率较凹状反光膜增大20%。同时,实验测量结果证明了理论分析的正确性。

In order to study the changing rules of the reflective characteristics of the reflective film in a curved state,the mapping relationship between the dihedral angle of the reflective surface of the curved Cube Corner Reflector(CCR)and the bending angle is established based on the principle of volume invariance.The reflection theory analyzes the reflection characteristics of a single curved CCR and a curved reflective film,and obtains the axis-symmetric distribution of the light rays emitted by the single curved CCR and the maximum theoretical effective bending angle of the curved reflective film is 70.52°.Finally,using ray tracing software to simulate a single curved CCR and curved reflective film,the results show that the diffraction pattern of a single curved CCR and curved reflective film is axisymmetrically distributed when light is normally incident;the diffraction pattern of a single curved CCR and curved reflective film is axisymmetrically distributed;the maximum effective bending angle of the curved reflective film decreases with the increase of the bending angle,a decrease of 0.7%,and the deviation between the value and the theoretical value is small;when the bending angle is greater than 20°,the reflectivity of the convex reflective film is increased by 20%compared with the concave reflective film.At the same time,the experimental measurement results prove the correctness of the theoretical analysis.