降低浸镀锌液的换热系数，采用小角度快速浸入可以降低焊缝区域温差。
The temperature difference of welding zone can be decreased with small dipping angle, high dipping speed and low heat exchange coefficient of dipping Zn liquid.
所要解决的技术问题是将LED芯片小角度区域光转换到大角度区域，以达到均光的效果。
The technical problem to be solved is to convert the light of a small-angle area of an LED chip to a large-angle area so as to achieve the effect of light equalization.
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