| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-pressure discharge lamp wherein etching into the bulb inner wall of a high-pressure discharge lamp can be suppressed, and deposits can be prevented from being produced, and their influences to the illuminance of the lamp and to a lamp life are reduced. SOLUTION: The high-pressure discharge lamp comprises: discharge vessel 1 which is composed of ceramic having a garnet structure as a main component, has a small-diameter cylinder being a sealing part, in which a rare earth metal oxide layer is formed on its internal surface; conductors 23a, 23b in which electrodes 2A, 2B are arranged at the tip side which is inserted into and sealed with the small-diameter cylinder: the electrode 2A, 2B which are arranged in the discharge vessel 1 and also arranged at tips of the conductors 23a, 23b; and a discharge medium sealed into the discharge vessel 1. COPYRIGHT: (C)2009,JPO&INPIT
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