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青少年视力下降的原因之一是长时间在较暗光线下阅读或写字。这里介绍一个防近视测光器,当环境光线低于国家规定的光照度标准时(100Lx)会出“滴、滴…”声响,并发出闪闪红光,说明环境光线低于100Lx,已下适宜阅读书写。工作原理防近视测光器线路见图所示,线路由光敏传感器、电子开关和声响发生器等部分组成。
One of the reasons why teenagers have decreased eyesight is reading or writing in darker light for a long time. Here is an anti-myopia meter, when the ambient light is lower than the national standard of illumination (100Lx) will be a “drop, drop ...” sound, and issued a sparkling red light, indicating ambient light below 100Lx, has been suitable for reading writing . Working principle Anti-myopia meter line shown in the photo, the line from photosensitive sensors, electronic switches and sound generator and other components.