| US 7,468,584 B2 | ||
| Discharge lamp with a discharge filling having a measured emission intensity of argon to OH radicals and method of manufacturing the same | ||
| Takuya Tsukamoto, Himeji (Japan); Noriko Nishiaki, Himeji (Japan); Yoshihiro Horikawa, Himeji (Japan); and Senga Takehito, Himeji (Japan) | ||
| Assigned to Ushiodenki Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Mar. 29, 2006, as Appl. No. 11/391,307. | ||
| Claims priority of application No. 2005-102248 (JP), filed on Mar. 31, 2005. | ||
| Prior Publication US 2006/0220562 A1, Oct. 05, 2006 | ||
| Int. Cl. H01J 9/00 (2006.01); H01J 9/42 (2006.01); H01J 61/12 (2006.01); H01J 61/16 (2006.01) | ||
| U.S. Cl. 313—637 [313/640; 313/642; 313/643; 445/53; 445/3; 445/16] | 7 Claims |
| 6. Discharge lamp, comprising a discharge vessel in which a pair of electrodes is disposed and which is filled with at least 0.15 mg/mm3 of mercury, argon (Ar), and halogen, and wherein the difference c/a2−b/a1 has a value in the range of 0.001 to 15 where b/a1 is the relation between the emission intensity a1 of argon (Ar) at a wavelength of 668 nm and the emission intensity b of OH radicals at a wavelength of 309 nm in the case of a glow discharge of the discharge lamp without hydrogen having been added to the discharge vessel and c/a2 is the relation between the emission intensity a2 of argon (Ar) at a wavelength of 668 nm and the emission intensity c of OH radicals at a wavelength of 309 nm in the case of glow discharge of the discharge lamp after adding hydrogen to the discharge vessel of the discharge lamp. |