| 摘要 |
<p>PURPOSE:To facilitate the storage and the transportation and to facilitate the assembling, by providing a protective film which is in solid state under normal temperature while evaporates through heating on the surface of a cathode. CONSTITUTION:A cathode 1 impregnated with a thermion emitting subsistance and a cathode tube 2 are assembled and inserted into a zig 3, then located to expose the cathode 1 and connected to the positive electrode 4. The other negative electrode 5 is supporting a target 6. A board of MoO3, for example, which is in solid state under normal temperature while evaporates through heating is employed for said target 6. Said subsistance will adhere as a protective film onto the surface of the cathode 1 when applying from high frequency power source 8.</p> |
