| 摘要 |
A discharge lamp ( 10 ) has a fixing base ( 20 ) on one end. In some embodiments, the fixing base comprises a cylindrical first body portion ( 21 ) having a pair of notches ( 21 H), a cylindrical second body portion being larger than the diameter of the first body portion and having a joint ( 23 H), and a groove portion ( 25 ) formed in between the first and second body portion and having an equal or less diameter of a space of the pair of notches. A first body portion and a stepped surface ( 21 B) of the groove portion is contacted to a base surface of a lamp holder ( 50 ) when the fixing base is inserted to the lamp holder.
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