Short arc type ultra-high pressure discharge lamp
AssigneeUshio Denki Kabushiki Kaisha
InventorsKensuke Fukushima, Tetu Okamoto
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Abstract
The present invention is a short arc type ultra-high pressure discharge lamp in which a pair of electrodes 3 are disposed inside an arc tube 1 that comprises quartz glass, seal portions 2 are formed that comprise quartz glass and extend to both sides of the arc tube 1, and at least 0.15 mg/mm3 of mercury is filled into the arc tube 1, wherein a metal foil 4 is embedded in each of the seal portions 2, and metal granular lumps 6 are protrusively provided on surfaces of each metal foil 4.
Claims3
A short arc type ultra-high pressure discharge lamp, in which a pair of electrodes are disposed inside an arc tube that is made of quartz glass, seal portions are formed that are made of quartz glass and extend to both sides of said arc tube, and at least 0.15 mg/mm3 of mercury is filled into said arc tube;
- wherein a metal foil, and part of each electrode connected to said metal foil, are embedded in each of said seal portions;
- and metal granular lumps are protrusively provided on surfaces of said metal foil embedded in each of said seal portions.
Dependencies are inferred from the claim text.