论文部分内容阅读
日常生活中的电视机、电脑显示器等图像显示设备,大都使用真空显像管来显示图像。为了使图像清晰,必须对从电子枪打出来的电子束进行聚焦处理,让电子束通过电子透镜,与光学透镜对光束的聚集作用相似,把散射开的电子束会聚起来,在荧光屏上得到一个又亮又小的光点,加上扫描电路的作用,才能显示清晰的图像。那么电子透镜的结构和电学原理是怎样的呢? 电子透镜可由电场构成,也可由磁场构成,实际使用中,同一显像管既用电场透镜。又用磁场透镜,下面分别阐述两种电子透镜的构成和原理。
In everyday life, televisions, computer monitors and other image display devices mostly use vacuum picture tubes to display images. In order to make the image clear, it is necessary to focus the electron beam emitted from the electron gun so that the electron beam passes through the electron lens and is similar to the focusing action of the optical lens on the light beam to converge the scattered electron beam to obtain a Bright and small light spots, coupled with the role of scanning circuit, can display a clear image. So what is the structure and electrical principle of the electron lens? The electron lens can be composed of an electric field and a magnetic field. In actual use, the same tube uses the electric field lens. Again with the magnetic lens, the following are described two kinds of electronic lens structure and principle.