| 摘要 |
PURPOSE:To prevent the generation of leakage currents by mounting a conductor for a short circuit connecting a predetermined low potential point in an electrode and a section comparatively adjacent to a low potential point in a discharge tube supporter. CONSTITUTION:A conductor 7 for a short circuit connecting the central section of an electrode 22 at a low potential point in electrode 21, 22 and a metallic position 421 comparatively adjacent to the prescribed position of the central section of the electrode 22 in a strut 42 for supporting a discharge tube is set up. A phenomenon in which residual charged particles with discharge intend to leak toward the direction of a discharge-tube support box body 41 in the discharge tube 1 and in which parasitic discharge develop toward the inside of the discharge-tube support box body 41 from electrode sections in the discharge tue 1 to cause large currents intend flow toward a grounding point is prevented by the conductor 7 for the short circuit. Accordingly, safety and stability on operation are improved. |
