发明名称 |
Metal halide lamp having heat dam portion |
摘要 |
A metal halide lamp comprises a sealed tube containing mercury vapor and halide, and electrodes extending to a center of the sealed tube, supported by sealed portions at both ends of the sealed tube. A notch extending in a direction perpendicular to an axis of the electrode is formed in each electrode. A transverse cross sectional area of a portion where the notch is formed is smaller than the transverse cross sectional area of another portions and functions as a heat dam portion for damming heat. Accordingly, temperature of a proximal portion from the heat dam portion to the support portion is lower than that of the same portion of the conventional electrode, and temperature of a distal end portion is higher than that of the same portion of the conventional electrode. Thus, formation of low-melting alloy due to reaction of the proximal portion of the electrode and the metal halide can be suppressed.
|
申请公布号 |
US5614787(A) |
申请公布日期 |
1997.03.25 |
申请号 |
US19950496907 |
申请日期 |
1995.06.29 |
申请人 |
HAMAMATSU PHOTONICS K.K. |
发明人 |
KAWAI, KOUJI;ISHIHARA, SHIGEKI;MASUDA, NAOKI;OTA, HIROHISA;YOGI, OSAMU |
分类号 |
H01J61/073;H01J61/52;H01J61/82;(IPC1-7):H01J17/18 |
主分类号 |
H01J61/073 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|