5、护器的理论与硬件的设计进行了研究。通过试验证明该视力保护器可实现超距报警、光线强度报警以及定时报警功能且可靠性良好,使用方便、易于实现。[关键词]视力保护器;超声波;传感器;STC89C52ThedesignofthevisionprotectorLiuShaoshuai(Grade 2012,Class 01,Major in Communication Engineering,School of Physics and Telecomm-unication Engineering of Shaanxi University of Technology,Hanzhon