Metal halide lamp and vehicle headlamp

Details Metal halide lamp and vehicle headlamp Metal halide lamp and vehicle headlamp

2011-03-22

2011-03-22

Patel, Nimeshkumar D (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

C313S635000, C313S637000, C313S638000, C313S573000, C313S017000, C313S317000, C313S111000

Reexamination Certificate

active

07911144

ABSTRACT:
The invention relates to a metal halide lamp for a vehicle headlamp comprising a cylindrically-shaped discharge vessel (23) having a ceramic wall which encloses a discharge space comprising Xe and ionizable filling, and a cylindrically-shaped outer bulb (21) surrounding the discharge vessel (23). According to the invention a portion (25, 26) of the surface of the outer bulb (21) facing away from the discharge vessel (23) is shaped as a negative lens. Preferably, the portion (25, 26) encompasses a segment of the outer bulb (21) with a segment angle α in the range between 30≦α≦60°. Preferably, the portion (25) forming the negative lens is shaped as a flat surface.

REFERENCES:
patent: 6169367 (2001-01-01), Muto et al.
patent: 2003/0031026 (2003-02-01), Tiesler-Wittig
patent: 2004/0156984 (2004-08-01), Vitt et al.
patent: 1314317 (1973-04-01), None
patent: 02168551 (1990-06-01), None
patent: 0067294 (2000-11-01), None
ISR, Written Opinion of The International Searching Authority PCT/IB2004/050606.

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