Patent ID: 6611102
Filing Date: 2003-08-26
Classification: H01K,Y02B

Abstract:
A tungsten-halogen light bulb comprising an arc tube with a seal portion at an end, a filament is provided in an interior of the arc tube and a basic gas mainly comprising at least one gas selected from the group consisting of gaseous xenon and gaseous krypton is filled, whereinboth formulas (1) and (2) are satisfied when V (Volt) is a rated voltage of the tungsten-halogen light bulb, P (MPa) is a filling pressure of the basic gas at a room temperature, and Xe vol. % and Kr vol. % are respectively composition ratios of the gaseous xenon and the gaseous krypton; V&gE;100 (Volt)â€ƒâ€ƒ(1) P&gE;1.0+{0.1Ã—(Kr vol. %/(Kr vol. %+Xe vol. %))}â€ƒâ€ƒ(2) where Kr vol. %+Xe vol. %=100(%), 0&lE;Kr vol. %&lE;100, and 0&lE;Xe vol. %&lE;100.