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US 2006/0220562 A1Published application
Discharge lamp
AssigneeUshiodenki Kabushiki Kaisha
InventorsTakuya Tsukamoto, Noriko Nishiaki, Yoshihiro Horikawa, Senga Takehito
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AssigneeUshiodenki Kabushiki Kaisha
InventorsTakuya Tsukamoto, Noriko Nishiaki, Yoshihiro Horikawa, Senga Takehito
Estimating the term…
Process for producing a discharge lamp having a silica discharge vessel with an emission space in which there is a pair of electrodes at least 0.15 mg/mm3 of mercury, argon (Ar), and halogen by measuring the relation b/a1 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 a state of glow discharge of the discharge lamp; supplying hydrogen into the discharge vessel of the discharge lamp; measuring the relation c/a2 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 state of glow discharge of the discharge lamp; and fixing the difference c/a2−b/a1 at a value in the range of 0.001 to 15.
Process for producing a discharge lamp having a silica glass 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, comprising the steps of:
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.
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