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US 2008/0185967 A1Published application
High-Intensity Discharge Lamp
AssigneeKoninklijke Philips Electronics N.V.
InventorMichael Haacke
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AssigneeKoninklijke Philips Electronics N.V.
InventorMichael Haacke
Estimating the term…
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.
High-intensity discharge lamp comprising an inner bulb (1) with a discharge vessel (11) for enclosing a discharge gas, and an outer bulb (2) surrounding the inner bulb (1), wherein a longitudinal axis of the inner bulb (1) is displaced in a horizontal operating position of the lamp above a longitudinal axis of the outer bulb (2) such that the distance between the discharge vessel (11) and the outer bulb (2) is smaller at the upper side of the lamp than at the lower side of the lamp.
Dependencies are inferred from the claim text.