METAL HALIDE LAMP FOR AUTOMOBILE HEADLAMP

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PROBLEM TO BE SOLVED : To eliminate the defect where the luminescent color is changed by a large amount, corresponding to the usage in a conventional metal halide lamp for an automobile headlamp. SOLUTION : A metal halide lamp for an automobile headlamp is provided with an arc tube made of quartz glass; each metal foil for external power-supply connection which deposited inside quartz glass at each sealed part provided to both ends of the arc tube; a metal halide and a rare earth element halide sealed in a hollow light emitter of the arc tube; paired electrodes made of a refractory metal, whose each one end is welded to the metal foil and whose each the other end is protruded into the hollow light emitter; and each coil, made of a refractory metal and covering each electrode in each sealed part. The metal halide lamp has a structure where the distance L(mm) between the end on the metal foil side of the coil and the metal foil, and a maximum thickness M(mm) of the metal foil satisfy the relation 40≤L/M and L<1.6. COPYRIGHT : (C)2008, JPO&INPIT