| 摘要 |
PURPOSE:To raise the brightness of a hydrogen discharge tube and lengthen its life by installing a power source that can supply electric power to an anode and a bulkhead plating, which is used as a cathode, under the situation in which continuous discharge is maintained. CONSTITUTION:Discharge is started by connecting an anode 1 and a cathode 2. Next, throught electric supply to a bulkhead plating 3 and the anode 2 by shifting a contact segment from contact point 12 to a contact point 13, discharge between them is set off. Thus by using the hot-cathode 1 only at the time of starting discharge and employing the bulkhead plating 3 as the cathode at a stationary state, it is possible to reduce oxide consumption of the cathode 1 and lengthen its life. Even if twice as much electric current is flowed to the bulkhead plating 3 and the anode 2 compared to the case with the hot- cathode 1, no breakdown occurs due to ion shock. Accordingly, brightness and life of the discharge tube can be increased though this arrangement. |
