| 摘要 |
PURPOSE:To obtain the discharge lamp in the caption having high luminous efficiency, a long life and stable brightness distribution by providing a hot cathode type electrode inside a bulb, in whose inside a phosphor coating is formed, while sealing rare gas mainly composed of xenon into the bulb inside with specific pressure. CONSTITUTION:A phosphor coating 2 is formed on the inner surface of a bulb 1 and a hot cathode type electrode 5 is provided inside this bulb 1 while the rare gas mainly composed of xenon is sealed inside this bulb 1 with the pressure of 20-200 Torr. Accordingly, the influence of the atmospheric temperature is exerted on the pressure inside the bulb 1 to a small extent, luminous efficiency and starting performance are stabilized, and further since a hot cathode type is adopted as the electrode 5, it is possible to preheat at the time of starting and to lower starting voltage. Thereby, lamp voltage is lowered to improve luminous efficiency and unevenness of brightness distribution is dissolved for obtaining stable brightness distribution.
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