在光电流足够大的条件下工作的光电变换器中,电子图象会有畸变(散焦),这是由于光电阴极分布电阻上的电压降使靠近阴极区域的电场发生变形引起的。为了减少这种畸变(在脉冲照射情况下这种畸变尤为显著),将光电阴极做在栅网结构细小的基片上。而且栅网电阻和网孔尺寸越小,栅网效果就越大。但是,在给定栅网连接部分的宽度的条件下,减小网孔尺寸 In optoelectronic converters operating at conditions of sufficient photocurrent, the electronic image is distorted (defocused) due to the voltage drop across the photocathode distribution distorting the electric field near the cathode region. In order to reduce this distortion, which is particularly pronounced in the case of pulsed illumination, a photocathode is made on a substrate with a thin grid structure. And grid resistance and the smaller the mesh size, the greater the grid effect. However, the mesh size is reduced given the width of the grid connection