运用转动惯量定义式直接计算出椭圆环刚体绕垂直与环平面且通过中心轴的转动惯量。
Use of rotational inertia of the definition of calculated rigid oval ring around the ring with the vertical plane through the central axis and the moment of inertia.
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.
多个鳍片垂直于中心轴的径向排列。
The plurality of fins apply a radial arrangement perpendicular to the central shaft.
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