Patent ID: 6239550
Filing Date: 2001-05-29
Classification: H01J,H01K

Abstract:
A tungsten halogen lamp comprising:an arc tube of fused quartz having a sealing portion at one end with a halogen element and a rare gas enclosed and a filament coil held within the arc tube, an infrared reflecting film being formed on a surface of the arc tube, the sealing portion scaling metal foils connected to the filament coil and outer leads having one end connected to the metal foils and the other end led out of the sealing portion, the surfaces of the metal foils being exposed to gaps that are not hermetically sealed by the sealing portion, whereinthe infrared reflecting film is formed on surfaces of the outer leads and surfaces of the metal foils, and at least a part defined on the surface of the sealing portion has one selected from the group consisting of a portion where the infrared reflecting film is not formed and a portion where at least a part of the infrared reflecting film is removed.