Backward diode ( unitunnel diode). Envelope can be shown or hidden. 反向二极管(单隧道二极管)。可显示或隐藏管壳。
The distinguishing feature of this plan is to adopt silicon backward photoelectric diode as target screen and to scan with fast electron. 特点是采用反向击穿硅光电二极管做靶面,并用快电子扫描。