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    • 5. 发明专利
    • Arc tube, fluorescent lamp, and manufacturing method of arc tube
    • 弧管,荧光灯和弧管的制造方法
    • JP2010170839A
    • 2010-08-05
    • JP2009012396
    • 2009-01-22
    • Nec Lighting LtdNecライティング株式会社
    • NOMURA KOJI
    • H01J61/42H01J61/28H01J61/30H01J61/44
    • C09K11/7787C09K11/7734C09K11/7739C09K11/7777H01J61/327H01J61/42
    • PROBLEM TO BE SOLVED: To provide an arc tube in which the light volume of light irradiated downward is larger at the time of actual use of a fluorescent lamp, a fluorescent lamp, and a manufacturing method of the arc tube.
      SOLUTION: The arc tube 11 has a folding back portion 12b at the middle part of a glass tube 12 and has a revolving portion 12a in which the portion from the folding back portion 12b to the end parts 13a, 13b is at least revolving around a revolving axis Y, and has a double helix profile in which a fluorescent film is formed on the inner circumferential face of the glass tube. Then, in the two portions of the inner circumferential face of the glass tube 12 at the revolving portion 12a opposed to in a direction parallel to the revolving axis Y, the folding-back portion side fluorescent films F1a, F2a, F3a on the folding back portion 12b side are formed respectively thicker than the end part side fluorescent films F1b, F2b, F3b on the end parts 13a, 13b side.
      COPYRIGHT: (C)2010,JPO&INPIT
    • 要解决的问题:提供一种电弧管,其中在实际使用荧光灯时,向下照射的光的光量较大,荧光灯和电弧管的制造方法。 解决方案:电弧管11在玻璃管12的中部具有折回部分12b,并且具有旋转部分12a,其中从折回部分12b到端部13a,13b的部分至少为 围绕旋转轴线Y旋转,并且具有在玻璃管的内周面上形成荧光膜的双螺旋轮廓。 然后,在与旋转轴线Y平行的方向上相对的旋转部12a处的玻璃管12的内周面的两个部分,折回部的折回部侧荧光膜F1a,F2a,F3a 部分12b侧分别比端部13a,13b侧的端部侧荧光膜F1b,F2b,F3b厚。 版权所有(C)2010,JPO&INPIT