photo cell

基本解释

Integrating devices use the photo cell pulse output to determine total amount of turning.
积分装置利用光电池的脉冲输出来确定旋转的总量。
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High precision photo-cell color-mark slotting system, correct cutting position, when no candy, the packing film will stop.
高精密度光电色标跟踪系统，切刀位置准确，无糖不送纸装置。
This machine technology is advanced, no second hoisting, reduced because of many times given photo-cell and lifting the damage;
该机工艺先进，不用二次吊装，减少了因多次吊装对坯体的损伤；
zjzhongyang.com

Cell phones had cameras for at least that long before the traditional photo taking and processing business was seriously threatened.
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a device in which the photoelectric or photovoltaic effect or photoconductivity is used to produce a current or voltage when exposed to light or other electromagnetic radiation. They are used in exposure meters, burglar alarms, etc (Also called photoelectric cell, electric eye)