Patent ID: 8203271
Filing Date: 2012-06-19
Classification: H01J

Abstract:
1. A metal halide lamp comprising: a light-transmitting hermetic vessel made of quartz glass, including: a surrounding portion having a discharge space formed therein; and at least one sealing portion joined to the surrounding portion; electrodes sealed within the discharge space of the light-transmitting hermetic vessel; a discharge medium filled within the discharge space of the light-transmitting hermetic vessel, and containing at least a halide of light emitting metal and a rare gas; and a sealed metal foil connected to a proximal end of an associated one of the electrodes and hermetically embedded within the sealing portion of the light-transmitting hermetic vessel, and wherein at a position away from a portion of the sealed metal foil connected to the associated electrode, the foil is formed with height-differentiating portions comprised of laser traces on at least one of surfaces of the metal foil.