1858年发现了阴极射线以来,在物理学上以及科学技术上都得到广泛的应用。电子管、雷达指示管、示波管、显象管都是以阴极射线进行工作的。在物理学上英国物理学家J.J.汤姆生自1894年就开始做一系列的阴极射线实验,1897年测定了荷质比,确定了阴极射线的本质是一束电子流,普教仪器配备目录中J2453～J2456阴极射线管就是根据阴极射线是一束电子流来演示电子束在磁场或电场中所受力的作用的。但这些阴极射线管发射电子是属于冷阴极发射,加速极 Since cathode ray was discovered in 1858, it has been widely used in physics as well as science and technology. Electronic tubes, radar indicators, oscilloscopes, and kinescopes all work with cathode rays. In physics, British physicist JJ Thomson began a series of cathode ray experiments since 1894. In 1897, the charge-mass ratio was determined. It was determined that the nature of cathode rays is a stream of electrons. J2453 ~ J2456 cathode ray tube is based on the cathode ray is a beam of electrons to demonstrate the role of the electron beam in the magnetic field or electric field force. However, these cathode ray tubes emit electrons belonging to the cold cathode emission, and the acceleration electrode