Today's LEDs have reflector cups and focusing optics to focus and collimate their output.

今天的LED让反射杯和焦点的光学来焦点和校准他们的输出。

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This paper introduces focusing features of a reflector antenna. It is pointed out that besides the focus on the axis , there are focusing off the axis.

本文介绍了抛物反射面的聚焦特性，指出除了主轴点状聚焦以外，尚存在偏轴非点状聚焦。

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This paper introduces focusing features of a reflector antenna. It is pointed out that besides the focus on the axis , there are focusing off the axis.

本文介绍了抛物反射面的聚焦特性，指出除了主轴点状聚焦以外，尚存在偏轴非点状聚焦。

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