ELECTRODE-LESS DISCHARGE LAMP

摘要

PURPOSE:To facilitate the start of an electrode-less discharge lamp. CONSTITUTION:An induction coil 2 is wound on the outer periphery a bulb 1 made of a translucent material and sealed with discharge gas. High-frequency current is fed to the induction coil 2 from a high-frequency power source 4a, and the high-frequency magnetic field is applied to the discharge gas sealed in the bulb 1 to excite the discharge gas for luminescence. A unipolar auxiliary electrode 3 is arranged on the bottom face of the bulb 1, and high-frequency voltage is applied across the ground and the auxiliary electrode 3 from the second high-frequency power source 4b. A stripe-like preliminary discharge with a free end at one end is generated on the bulb 1 by the high-frequency electric field around the auxiliary electrode 3, and the transition to an arc discharge by the high-frequency magnetic field around the induction coil 2 is facilitated.