According to the operational principle of original switch K2 for the console of orthopantomography X-ray unit, the common switch K1 and some accessory circuits are used to improve K2.

• 摘要针对全景X线机控制台原开关(K2)的工作原理，采用一般开关(K1)和一些辅助电路对开关(K2)进行了替代改造。实际使用效果良好。