| 摘要 |
PROBLEM TO BE SOLVED: To achieve a color temperature characteristic equivalent to a general image-projecting high-pressure discharge lamp while considering environment. SOLUTION: In this high-pressure discharge lamp, electrodes 151, 152 are disposed inside a bulb 11 made of transparent quartz glass at a counter distance≤3.0 mm. At least one kind of first halogen metal of A mg/mm<SP>3</SP>selected from Sc, Dy, Nd, In and the other rare-earth metal, at least one kind of second halogen metal of B mg/mm<SP>3</SP>selected from Zn, Mn, Fe, and Al, and a rare gas≥2 atmospheric pressure are sealed inside the bulb 11, and drive is performed without essentially containing mercury, with input power≥80 W, with a lamp voltage/an inter-electrode distance =10 V/mm or above. Sealing amounts per unit volume of the first halogen metal A and the second halogen metal B have relation of 0.5<A/B<1.5, so that the high-pressure discharge lamp has a color temperature≥5,000 K as a short arc metal halide lamp not containing mercury, and can obtain a characteristic having excellent color reproducibility. COPYRIGHT: (C)2007,JPO&INPIT
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