Best performance usually occurs when the output is funneled using a reflector to focus the source into the light pipe 最好的成效为利用反射器使输出光为漏斗形的聚焦至光管中。
2.
Picture 2 : a schematic sketch outlining the rings . the solid parts of the ring are at the front and the dotted parts of the ring are in the back 图片2 :从层圈的图解上可知道,固线部分的层圈为前面,而后面则以点线显示漏斗形的底部。