| 摘要 |
In a brightness intensifier tube there is provided, preferably in the exit screen or, in the case of a brightness intensifier comprising a channel plate intensifier, on an input electrode thereof, a fixed alignment marker, for example by local burning in of screen material by photoelectrons from the entrance screen which are liberated therefrom by irradiation by a laser beam. For tubes comprising a fixed entrance optical system the alignment marker is preferably provided by focused application of light via the optical system.
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