Automotive headlight discharge bulb

Details Automotive headlight discharge bulb Automotive headlight discharge bulb

2008-01-01

2008-01-01

O'Shea, Sandra (Department: 2875)

Illumination

Supported by vehicle structure

Projection-type headlamp

C362S459000, C362S487000, C362S507000, C362S509000

Reexamination Certificate

active

07314298

ABSTRACT:
A discharge bulb is provided with an arc tube main body in which an arc tube having a discharge light emitting portion (a hermetically sealed glass envelope) where electrodes are provided in such a manner as to face each other is enclosed in a cylindrical shroud glass tube. The discharge bulb is configured so that a light distribution pattern having a predetermined cut-off line is formed by light intercepting portions (light intercepting films) and a light distribution control reflector. A frost treatment is applied to only a light emitting area on an outer surface of the shroud glass tube which corresponds to an area along the cut-off line in the light distribution pattern.

REFERENCES:
patent: 5646471 (1997-07-01), Schöller et al.
patent: 5971575 (1999-10-01), Matubara
patent: 04094001 (1992-03-01), None
patent: 5-251055 (1993-09-01), None
patent: 6-163010 (1994-06-01), None
patent: 7-211288 (1995-08-01), None
patent: 2002-93369 (2002-03-01), None

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