Cold cathode fluorescent lamp with molybdenum electrode
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01J-061/36
H01J-061/30
출원번호
US-0857488
(2004-05-27)
등록번호
US-7439676
(2008-10-21)
우선권정보
AT-GM370/2003(2003-05-27)
발명자
/ 주소
Walser,Herman
Knabl,Wolfram
Leichtfried,Gerhard
Fechner,J��rg Hinrich
Ott,Franz
Diezel,Ralf
Hueber,Brigitte
출원인 / 주소
Plansee SE
Schott AG
대리인 / 주소
Greenberg,Laurence A.
인용정보
피인용 횟수 :
4인용 특허 :
9
초록▼
A cold cathode fluorescent lamp (1) has feedthrough pins (5) made from molybdenum or a molybdenum alloy that form a glass-metal seal (6) with a glass composed of 55-75 wt. % SiO2, 13-25 wt. % B2O3, 0-10 wt. % Al2O3, 5-12 wt. % alkali oxides, 0-3 wt. % alkali earth oxides, 0-5 wt. % ZrO2, 0-10 wt. %
A cold cathode fluorescent lamp (1) has feedthrough pins (5) made from molybdenum or a molybdenum alloy that form a glass-metal seal (6) with a glass composed of 55-75 wt. % SiO2, 13-25 wt. % B2O3, 0-10 wt. % Al2O3, 5-12 wt. % alkali oxides, 0-3 wt. % alkali earth oxides, 0-5 wt. % ZrO2, 0-10 wt. % TiO2 und 0-5 wt. % remaining oxides. The lamp has hollow cathodes (4) made from a material of the group molybdenum, molybdenum alloys, niobium, niobium alloys, and the lamp is manufactured in a compact form using conventional manufacturing parameters, and the resulting lamp has crack free, long-term vacuum-tight glass-metal seals.
대표청구항▼
We claim: 1. A cold cathode fluorescent lamp, comprising: a discharge envelope of hard glass, said discharge envelope having a phosphor coating on an inner surface thereof and containing a filling gas component capable of emitting UV light; a plurality of hollow cathodes inside said discharge envel
We claim: 1. A cold cathode fluorescent lamp, comprising: a discharge envelope of hard glass, said discharge envelope having a phosphor coating on an inner surface thereof and containing a filling gas component capable of emitting UV light; a plurality of hollow cathodes inside said discharge envelope; a plurality of feedthrough pins connected to said hollow cathodes; and a plurality of glass-metal seals joining said feedthrough pins to the said discharge envelope in a vacuum-tight seal; wherein: said feedthrough pins have a diameter of 0.4-1.2 mm and are made of Mo-La2O3 at least along a length of said glass-metal seal; said hollow cathode is made at least in part from a material selected from the group consisting of molybdenum and molybdenum alloy; said hard glass, in a region of said glass-metal seals, having a coefficient of thermal expansion of 4.2-5.2��10-6K-1 and the following composition: SiO2 55-75 wt. %, B2O3 13-25 wt. %, Al2O3 0-10 wt. %, alkali oxides 5-12 wt. %, alkali earth oxides 0-3 wt. %, ZrO2 0-5 wt. %, TiO2 0-10 wt. %, a remaining oxide content of 0-5 wt. %. 2. The cold cathode fluorescent lamp according to claim 1, essentially consisting of said discharge envelope with said phosphor coating and said filling gas component; said plurality of hollow cathodes; said plurality of feedthrough pins; and said plurality of glass-metal seals. 3. The cold cathode fluorescent lamp according to claim 1, wherein said feedthrough pins comprise a first region made from said Mo-La2O3 and a second region containing at least 50 wt.% Ni, Fe or Co, and wherein a weld connection joins said first region and said second region. 4. The cold cathode fluorescent lamp according to claim 3, wherein said first region and said second region are joined by resistance welding or by laser welding. 5. The cold cathode fluorescent lamp according to claim 1, wherein said feedthrough pins and said hollow cathode are joined by welding substantially without use of filler material. 6. The cold cathode fluorescent lamp according to claim 1, wherein said hard glass at said glass-metal seal has the following composition: SiO2 60-72 wt. %, B2O3 15-20 wt. %, Al2O3 1-5 wt. %, alkali oxides 6-10 wt. %, ZrO2 0.05-5 wt. %, TiO2 0.5-10 wt. %, and a remaining oxide content of 0-1 wt. %. 7. The cold cathode fluorescent lamp according to claim 1, wherein the composition of said glass in the region of said glass-metal seal is equal to a composition of said glass of the discharge envelope. 8. The cold cathode fluorescent lamp according to claim 1, wherein the coefficient of thermal expansion α1 of said glass of said discharge envelope and the coefficient of thermal expansion α2 of said glass in region of said glass-metal seal satisfy the following requirement: 0≦(α1-α2)≦5��10 -6K-1. 9. The cold cathode fluorescent lamp according to claim 1, wherein the coefficient of thermal expansion α2 of said glass in the glass-metal seal and a coefficient of thermal expansion α3 of said feedthrough pins satisfy the following requirement: 1��10-7K-1≦(α3-α2 )≦1.3��10-6K-1. 10. The cold cathode fluorescent lamp according to claim 1, wherein said feedthrough pins are partially or completely coated with one or more oxides of the following metals Li, Mg, Ca, Sr, Ba, Sc, Y, lanthanides, Ti, Zr, Hf, Al, Ga, Si and Pb for at least a length of said glass-metal seal.
Geven Andreas S. G. (Eindhoven NLX) Renardus Max L. P. (Eindhoven NLX) Seinen Peter A. (Eindhoven NLX) Stoffels Jan A. J. (Turnhout BEX) Wijenberg Christoffel (Eindhoven NLX) Dielis Harald R. (Turnho, High-pressure discharge lamp.
Scholz, Friedhold; Lupton, David; Schielke, Jorg; Zingg, Holger, SiO2-glass bulb with at least one current lead-in, process for producing a gas-tight connection between them, and their use in a gas-discharge lamp.
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