光锥，时空中的面，在上面标出光通过一给定事件的可能方向。以时间维t替换三维空间之一维（如z），选择事件发生之点（x0,y0,t0）为原点，则此事件所能影响之空间范围为以ct（上限速度光速c与时间t的乘积）为半径所包围之圆（或球，如果考虑z）；此空间内一系列沿时间轴方向（F）半径渐增之圆堆积之锥即称之为光锥（将来光锥）。 另一方面在时间轴相反方向（P）与之对称之锥显示了能够对此事件发生产生作用的空间范围，称为此事件的过去光锥。光锥外的事件（他处）点无法与原点事件发生物理学意义上的因果关系。
Optical fiber image transfer devices such as optical fiber faceplate, optical fiber taper andoptical fiber image inverter have been widely used in modern industry. It is one high scienceand technology industry featuring the integration of intensive technology and intensive labor.
光纤面板、光纤光锥、光纤倒像器等光纤传像器件在现代工业中得到越来越广泛的应用,该产业是集技术密集型与劳动密集型于一体的高科技产业。
参考来源 - 光纤传像器件参数测试研究·2,447,543篇论文数据，部分数据来源于NoteExpress
介绍了散射光锥法的测量原理、实验、数据分析和几点结论。
The measuring principles, experiments, data analysis, and conclusions involved in using the scattered light-cone method are described in this paper.
试验证明，激光打孔的精度和稳定性优于一般光锥聚焦法打孔。
As proved by experiment, the accuracy and the stability of laser drilling are better than those of the common focusing of the light cone.
从下面向天空照射的激光会形成一个光锥，锥头在涡轮机的基部。
By shining the lasers into the air from below they were analysing a cone that had its point at the base of the turbine.
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