| 摘要 |
A high pressure metal vapor discharge lamp according to the present invention comprises the following first and second starting aid circuits mounted within an outer envelope. The first starting aid circuit includes a starting aid and a first thermal switch, and the second starting aid circuit includes a resistive element and a second thermal switch. These two thermal switches are arranged so that at the time of re-starting after a certain period of stopping, the first thermal switch is reset earlier than the second thermal switch. In this high pressure metal vapor discharge lamp having this specific structure, the starting characteristic is improved, and a high voltage pulse generated by the second starting aid circuit and a ballast is assuredly absorbed by an arc tube and occurrence of dielectric breakdown in the respective elements can be completely prevented. |
