其作用是改变发光二极管芯片的光的发射方向，将大部分光从侧面，沿垂直于发光二极管芯片中心轴线的方向聚集在很小的角度内向周围发射。

Being gotten together in very small Angle along direction perpendicular to central axis of chip of LED, most of light transmits around from side face.

youdao

其作用是改变发光二极管芯片的光的发射方向，将大部分光从侧面，沿垂直于发光二极管芯片中心轴线的方向聚集在很小的角度内向周围发射。

Being gotten together in very small Angle along direction perpendicular to central axis of chip of LED, most of light transmits around from side face.

youdao