| 摘要 |
PROBLEM TO BE SOLVED: To substantially improve durability of a dc lighting type mercury free metal halide lamp. SOLUTION: A discharge vessel 1 is formed by sealing parts 12a, 12b provided at both ends of a discharge space 14 filled with a discharge medium containing a halide and noble gas and containing no mercury in essence. An anode 3a2 and a cathode 3b2 are disposed face to face in the discharge space 14. One end part of metal foil 3a1 and one end of metal foil 3b1 are combined with the base side end part of the anode 3b2 and the base side end part of the cathode 3b2 respectively. The metal foil 3a1, 3b1 is airtightly sealed by the sealing parts 12a, 12b. The other ends of the metal foil 3a2, 3b2 are combined with external leads 3a3, 3b3 respectively, and are led out to the outside of the sealing parts 12a, 12b. The direction of a current flowing in the discharge vessel 11 is fixed, and the metal foil 3a1 on the anode 3a2 side and the external lead 3a3 connected to this metal foil 3a1 are coated with a rhenium metal film 4. COPYRIGHT: (C)2008,JPO&INPIT |
