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A retroreflector additionally called a reflex reflector, can mirror light back along a vector that is parallel or almost parallel corresponding to yet inverse in course from the light source. In this study, a reflex reflector is composed of pin arrays with a round angle on CCR. We found that the round angle influences the reflection efficiency and coefficient of luminous intensity. Our experiment demonstrated that with a smaller round angle, the reflectance efficiency is found that higher. Particularly, with R= 0.1 mm, 32.83% higher is obtained compared with R= 0.3 mm.