Electric lamp and discharge devices – With gas or vapor – Having electrode lead-in or electrode support sealed to...
Patent
1995-06-29
1997-03-25
O'Shea, Sandra L.
Electric lamp and discharge devices
With gas or vapor
Having electrode lead-in or electrode support sealed to...
313624, 313625, H01J 1718
Patent
active
056147872
ABSTRACT:
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.
REFERENCES:
patent: 3248586 (1966-04-01), Schlegel
patent: 5461281 (1995-10-01), Fromm et al.
Ishihara Shigeki
Kawai Kouji
Masuda Naoki
Ota Hirohisa
Yogi Osamu
Hamamatsu Photonics K.K.
O'Shea Sandra L.
Patel Vip
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