Discharge lamp with specific amounts of halogen, oxygen,...

Details Discharge lamp with specific amounts of halogen, oxygen,... Discharge lamp with specific amounts of halogen, oxygen,...

2006-02-21

2006-02-21

Guharay, Karabi (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

With particular gas or vapor

C313S639000, C313S567000, C313S576000, C445S026000

Reexamination Certificate

active

07002299

ABSTRACT:
A discharge lamp which maintains a high lumen maintenance factor even when operated for a long time is obtained in a discharge lamp which has a silica glass discharge vessel and a pair of opposed electrodes in the discharge vessel and in which the discharge vessel is filled with at least 0.15 mg/mm3mercury, a rare gas with argon as the main component, and 2×10−4μmole/mm3to 7×10−3μmole/mm3bromine by meeting the following conditions when feeding a direct current of 5 mA between the electrodes and a glow discharge produced:in-line-formulae description="In-line Formulae" end="lead"?1.0×10−4≦b/a≦1.2×10−1  Condition (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?c/a≦1.4×10−1  Condition (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?d/a≦1.2×10−2  Condition (3)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?e/a≦1.4×10−2  Condition (4)in-line-formulae description="In-line Formulae" end="tail"?where a is the emission intensity of the argon with a wavelength of 668 nm, b is the emission intensity of OH with a wavelength of 309 nm, c is the emission intensity of hydrogen (H) with a wavelength of 656 nm, d is the emission intensity of C2with a wavelength of 517 nm, and e is the emission intensity of CH with a wavelength of 431 nm.

REFERENCES:
patent: 6271628 (2001-08-01), Sugitani et al.
patent: 6669522 (2003-12-01), Nishida
patent: 11-329350 (1999-11-01), None
patent: 2002-075269 (2002-03-01), None

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