VACUUM CAPACITOR AND VACUUM VALVE

摘要

[PROBLEMS] To solve a problem that, when an adjusting nut is rotated in such a state that an adjusting screw and the adjusting nut are screwed together resulting in collision of thread grooves against microspikes during sliding between the thread grooves, cracking starts from the microspikes leading to breaking of a coating layer which in turn deteriorates the yield of a vacuum capacitor. [MEANS FOR SOLVING PROBLEMS] Fine particles (46) having a higher hardness than a first high-hardness coating layer (41) is sprayed from a nozzle (45) on the first high-hardness coating layer (41) covered with a moving-side thread groove (32x) located in a direction indicated by arrows, and a protruded part (32y) is removed to form a surface of the first high-hardness coating layer (41) on a smooth surface (47). Since the thread grooves are slid against each other on the smooth surface, the first high-hardness coating layer (41) is not broken, and the yield of the vacuum capacitor can be improved.