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    • 32. 发明授权
    • Arc tube for discharge lamp and method of fabricating the same
    • 放电灯电弧管及其制造方法
    • US06790115B2
    • 2004-09-14
    • US09988670
    • 2001-11-20
    • Kunio FukaiAkihiro Nagata
    • Kunio FukaiAkihiro Nagata
    • H05B3310
    • H01J9/247H01J61/34
    • An arc tube and method of fabricating the arc tube for a discharge lamp. The arc tube includes an arc tube main body 10 at which a sealed glass bulb 12 serving as a discharge portion sandwiched by pinch seal portions is formed at a portion of a glass tube W along the longitudinal direction thereof, and a cylindrical shroud glass 20 which is welded on and integrated with the arc tube main body 10 so as to cover the sealed glass bulb 12, the front and rear end portions of the shroud glass 20 may be joined, for example, by welding on shroud glass welded portions with circular cross sections provided at the front and rear end sides of the arc tube main body 10, respectively. The inner peripheral surface of the diameter reduced portion of the shroud glass tube 20, which is molten, soften and deformed inside along the radial direction, contacts closely to the circular outer peripheral surface on the arc tube main body 10 side, so that a space can not be formed at the welding portion of the shroud glass 20 (adhesion surface). Thus, the atmosphere does not enter into the sealed space 24 surrounded by the shroud glass 20, and accordingly, devitrification is prevented.
    • 一种用于放电灯的电弧管和制造电弧管的方法。 电弧管包括:发光管主体10,在玻璃管W的长度方向的一部分上形成有作为夹紧密封部分的排出部分的密封玻璃泡12和圆筒形护罩玻璃20, 与发光管主体10焊接在一起,以覆盖密封的玻璃泡12,护罩玻璃20的前端部和后端部可以例如通过在具有圆形十字形的护罩玻璃焊接部分上焊接 分别设置在电弧管主体10的前端和后端侧。 护罩玻璃管20的沿径向熔融,软化和变形的内径缩小部分的内周面与电弧管主体10侧的圆形外周面紧密接触,使得空间 不能形成在护罩玻璃20的焊接部(粘合面)。 因此,气氛不会进入被护罩玻璃20包围的密封空间24中,因此防止了失透。