| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve a start-up property of a high-pressure discharge lamp with mercury and halogen sealed in, enable to start up lighting of a lamp without failure at low voltage, and further, aim at downsizing and cost reduction of an optical device using a lamp of this kind. <P>SOLUTION: The optical device removes residual impurity gas in a discharge vessel (7) that can be an inducer of halogen gasification to an extent of H<SB>F</SB>/H<SB>T</SB>≤0.15, provided a total halogen amount sealed in the discharge vessel of the high-pressure discharge lamp (2) is H<SB>T</SB>(mol), and a gasified halogen amount in the discharge vessel at a light-off ambient temperature, and at the same time, at an outer surface of the sealing part of one electrode whose temperature first falls below liquefied temperature of mercury after lighting off of the lamp out of a pair of electrodes (9A, 9B) of the discharge lamp (2), a trigger wire (13) is wound around connected to the electrode opposing it. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
