| 摘要 |
In apparatus employing an image orthicon, when a signal corresponding to the image focused on the orthicon has been obtained by scanning the target of the orthicon, the photocathode is evenly flooded with light and at the same time the relative photocathode, accelerator and target potentials are such that photocathode electrons arrive at the target at an energy level at which they do not cause secondary emission but are absorbed by parts of the target on which positive charge remains. This removes any remanent image, permitting the image orthicon to be used for different images in rapid succession. |
