| 摘要 |
<P>PROBLEM TO BE SOLVED: To restrain deterioration of illumination intensity of a bulb by correlating an amount of iron and tin enclosed in an electrodeless lamp with a specific value. Ž<P>SOLUTION: At least rare gas and mercury, iron, iodine, and tin as discharge media are enclosed in a light-emitting space 12 of the approximately cylinder-shaped bulb 11 made of quartz glass, and the electrodeless lamp is discharged by microwaves irradiated from a magnetron. When an encapsulated amount of iron enclosed in the bulb 11 is A (mg) and an encapsulated amount of tin enclosed in the bulb 11 is B (mg), considerable deterioration of illumination intensity of emission light of the electrodeless lamp 100 in a wavelength band of 350 nm can be prevented by controlling the relationship between the encapsulated amounts of the iron and tin within a range of 0.5>B/A>0.1, and its life can also be extended. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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