High pressure discharge lamp, with tungsten electrode and...

Electric lamp and discharge devices – With gas or vapor – With particular gas or vapor

Reissue Patent

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Details

C313S639000, C313S642000, C313S113000, C313S633000, C313S571000, C313S641000, C313S643000, C313S631000, C313S632000, C313S636000, C313S638000, C313S640000, C313S566000

Reissue Patent

active

RE038807

ABSTRACT:
The present invention provides a high pressure discharge lamp which is provided with a discharge tube containing a pair of electrodes therein and being filled with mercury, an inert gas and a halogen gas, the amount of the mercury filled being 0.12 to 0.35 mg/mm3, the halogen gas being at least one gas selected from the group consisting of Cl, Br and I and being present in an amount of 10−7to 10−2μmol/mm3, and the electrodes being mainly composed of tungsten, and the tungsten as a material of the electrodes contains not more than 12 ppm of potassium oxide (K2O). In such a high pressure discharge lamp, blackening of the discharge tube due to the potassium oxide (K2O) contained in the tungsten, and decrease in illumination maintenance can be prevented, thus providing a high pressure discharge lamp with a long lifetime, a lighting optical apparatus using the high pressure discharge lamp as a light source, and an image display system using the lighting optical apparatus. In another aspect, the amount of —OH in the glass of the discharge tube is less than 3 ppm. In a further aspect, the discharge lamp has a restriking voltage of less than 20 V.

REFERENCES:
patent: 4156826 (1979-05-01), Hernqvist
patent: 5109181 (1992-04-01), Fischer et al.
patent: 5299279 (1994-03-01), Roberts
patent: 5670844 (1997-09-01), Yasudaa et al.
patent: 5691601 (1997-11-01), Frey et al.
patent: 5831388 (1998-11-01), Genz et al.
patent: 6483240 (2002-11-01), O'Hare et al.
patent: 6492772 (2002-12-01), Takeuchi
patent: 641015 (1995-03-01), None
patent: 2064211 (1981-06-01), None
patent: 54050359 (1979-04-01), None
patent: 54102069 (1979-08-01), None
patent: 1-50359 (1989-02-01), None
Communication from European Patent Office and attached Search Report, Sep. 3, 1999.

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