High-intensity discharge lamp

Details High-intensity discharge lamp High-intensity discharge lamp

2011-02-22

2011-02-22

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Special application

Vehicle

C313S595000, C313S600000

Reexamination Certificate

active

07893623

ABSTRACT:
A high-intensity discharge (HID) lamp comprising an inner bulb (1) with a discharge vessel (11) and an outer bulb (2), especially for application in an automotive headlight unit is disclosed. A lamp design is proposed by which high thermal stresses and increased quartz temperatures during run-up and steady state operation of the lamp are avoided so that the light output and the lifetime of the lamp is improved. This is substantially achieved by a positioning of the inner and the outer bulb (1, 2) such that a longitudinal axis of the inner bulb (1) is displaced in the operating position of the lamp above a longitudinal axis of the outer bulb (2) so that the distance between the discharge vessel (11) and the outer bulb (2) at the top side of the lamp is decreased and the distance between both at the bottom side is correspondingly increased.

REFERENCES:
patent: 5128589 (1992-07-01), Dakin
patent: 5726532 (1998-03-01), Wittig et al.
patent: 5736811 (1998-04-01), Westemeyer et al.
patent: 6495962 (2002-12-01), Uemura et al.
patent: 6750612 (2004-06-01), Takagaki et al.
patent: 481702 (1992-04-01), None
patent: 883161 (1998-12-01), None
patent: 1562929 (1980-03-01), None

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