| 摘要 |
<p>PURPOSE:To suppress the progress of anode oxidation at a high temperature and high moisture and to improve reliability by cutting a carbon film to regulate its resistance value, and then thermally aging it at 100 to 200 deg.C for 10 hours or more. CONSTITUTION:A carbon film (c) is formed on the surface of a porcelain rod (b), for example at 1000 deg.C under 10<-3>Torr by vacuum depositing. Then, the film (c) is cut in a predetermined pattern so as to regulate its resistance value, and the preformed piece is thermally aged. The conditions of the aging includes, for example, exposure in the air at 100 to 200 deg.C for 10 hours or more. Eventually, an electrode cap (e) and the film (c) is covered with resin (b). The progress of anode oxidation even at a high temperature and high moisture by the resin coating by such thermal aging is suppressed to improve its reliability.</p> |
