| 摘要 |
<p>16 : A semiconductor device comprising one or more cold cathodes is mounted by means of a weld on a support of a ceramic material so that areas at which emission occurs are situated opposite the openings in the support. Such a construction has various advantages. If the support is the end wall of a vacuum tube, the semiconductor body can be cooled in a simple manner, while moreover semiconductor zones can be connected directly. This results in a saving of lead-through pins in the vacuum tube, which especially in the case of several emission points increases the reliability of the vacuum. Another advantage consists in that the cathodes can be connected through the weld to a common connection on the support, which results in that the various emission points are applied to substantially the same surface potential, so that also the electron-optical behaviour is uniform for electrons which are generated at various emission areas.</p> |
