一种用于CAD/CAM(计算机辅助设计/计算机辅助制造)的19英寸彩色CRT已经研制出来。这种CRT的扫描频率为64kHz。新电子枪是采用三维相位空间法并借助于三维电子束轨迹的计算机模拟设计的。为了改进阴极发射的寿命性能,电子枪采用了最新研制的氧化物阴极。在束流为200μA时,2％峰值电流处的光点尺寸缩小到了0.8mm,利用小的束间距电子枪、新偏转线圈和新的半熔玻璃状吸气剂(frittable getter)有效地将散焦缩小了0.2mm。 A 19-inch color CRT for CAD / CAM (Computer Aided Design / Computer Aided Manufacturing) has been developed. This CRT scan frequency is 64kHz. The new electron gun is designed using 3D phase-space methods and computer simulations with the aid of three-dimensional electron beam trajectories. In order to improve the lifetime performance of the cathode emission, the electron gun uses the newly developed oxide cathode. At a beam current of 200 μA, the spot size at 2% peak current is reduced to 0.8 mm and the defocusing is effectively reduced with a small beam-to-beam electron gun, a new deflection coil, and a new frittable getter Shrink 0.2mm.