| 摘要 |
PURPOSE:To cause an unsaturated vapor pressure type high pressure sodium lamp to light by taking, into an outer tube, a starter composed of a starting tube and a resistance connected in series to each other and connected in parallel to a light emitting tube, together with said light emitting tube and combining these group of components with a constant power stabilizer for high pressure mercury arc lamp. CONSTITUTION:When a voltage is applied across the stem leads 7 and 8 through a power stabilizer for high pressure mercury arc lamp. a starting bulb 3 which forms a starting circuit in combination with a resistance 1 and a bimetal switch 2 turns ON and OFF a current flowing into said starting circuit within a short interval. The lamp is firmly started when a voltage of many short period pulses at both ends of a choke coil 15 generated by rapid change of this current is applied to both ends of said lamp. The bimetal switch 2 built in the starting circuit makes the starting bulb inoperative for a cooling period of about 5min required for re-starting of lamp in order to extend the life of the starting bulb and simultaneously to prevent deterioration of insulation in the lighting circuit due to unwanted high voltage pulses. |
