DE202006008336U1 - DC high-pressure gas discharge lamp - Google Patents

Abstract

DC high-pressure gas discharge lamp, especially for Motor vehicles, with a hermetically sealed by a glass wall discharge space (12), which is an ionizable filling comprising, with a first and a second electrode element (14, 16), each opposite are arranged projecting into the discharge space (12), with first and second current-carrying conductors (22, 24) comprising the first and second electrode elements (14, 16) connect to a lamp cap (26), wherein the first electrode element (14) as the cathode element (18) and the second electrode element (16) designed as an anode element (20) and wherein the anode element (20) faces the cathode element (18). a larger diameter and wherein the cathode element (18) and the anode element (20) are arranged substantially along a longitudinal axis (30), which passes through the lamp base (26), characterized in that the cathode element (18) is located closer to the lamp cap (26) Side of the discharge space (12) and the anode element (20) for the most part thermal decoupling of the anode element (20) from the lamp base (26) on the lamp base (26) more distant ...

Description

The Invention relates to a DC high-pressure gas discharge lamp, especially for Motor vehicles, with a hermetically sealed by a glass wall Discharge space, which has an ionizable filling, with a first and a second electrode element, each opposite one another are arranged projecting into the discharge space, with first and second current-carrying conductors, the first and second electrode elements with a lamp base connect, wherein the first electrode element as the cathode element and the second electrode element is designed as an anode element.

From the EP 0 903 772 B1 a direct current gas discharge lamp is known, which has a cathode and an anode in a hermetically sealed discharge space, by means of which electrical actuation an arc can be generated. The anode is arranged on the side facing the base of the discharge space, the cathode correspondingly opposite. Due to the stronger heating of the anode in the operating state relative to the cathode, there is indirectly a strong heating of the base by the anode and thus also a heating of an electronic unit associated with the base.

Of the The invention is therefore based on the object, a DC gas discharge lamp of the type mentioned in such a way that the heating of the Socket through the anode and thus the thermal load on a Base associated electronic unit is reduced.

Around to solve this task is provided that the cathode element on the lamp base closer Side of the discharge space and the anode element for the most part thermal decoupling of the anode element from the lamp base the lamp socket the more remote side of the discharge space is arranged. By such a shift of the anode in the of Lamp socket more distant area will allow the heat over the long anode current-carrying conductor dissipate to the environment, wherein the lamp base and thus the electronics unit of the ignition device thermally be less heavily loaded.

In Further development of the invention is provided that the first and second current-carrying conductor in essentially parallel to each other. This will be a special compact design achieved.

In Another embodiment of the invention is provided that the diameter of the anode element to the diameter of the cathode element in the ratio of 0.2 to 0.5 is located. As a result, on the one hand, the stronger electrical On the other hand, the thermal conductivity is taken into account the anode thereby improved.

Based the attached Drawings, the invention is explained in more detail below. Showing:

1 a schematic representation of the DC high-pressure gas discharge lamp according to the invention.

1 shows a schematic representation of a DC high-pressure gas discharge lamp 10 with a discharge room 12 which is hermetically sealed against the environment and has an ionizable filling. For generating an electric arc has the discharge space 12 a first electrode element 14 and a second electrode element 16 on, wherein the first electrode element 14 as cathode element 18 and the second electrode element 16 as an anode element 20 is executed. The cathode element 18 and the anode element 20 each protrude on opposite sides of the discharge space 20 into this, wherein the anode element 20 due to the DC current supply and the associated greater electrical load a larger diameter and thus a larger mass than the cathode element 18 having.

For electrical connection of the cathode element 18 and the anode element 20 to an ignition electronics, the high-pressure gas discharge lamp has first and second current-carrying conductors 22 . 24 on as well as an intermediate area 24a of the second current-carrying conductor. The first and second current carrying conductors 22 . 24 lead to a lamp base 26 that connects to an ignition electronics unit 28 manufactures.

10

High-pressure gas discharge lamp

12

discharge space

14

first electrode element

16

second electrode element

18

cathode element

20

anode element

22

first Current carrying conductor

24

second Current carrying conductor

24a

second Current carrying conductor intermediate area

26

lamp base

28

Ignition electronics unit

30

longitudinal axis

Claims (3)

DC high-pressure gas discharge lamp, in particular for motor vehicles, having a discharge space hermetically sealed by a glass wall (US Pat. 12 ) having an ionizable filling, with a first and a second electrode element ( 14 . 16 ), which in each case opposite in the discharge space ( 12 ) are arranged projecting, with first and second current guide conductors ( 22 . 24 ), the first and second electrode elements ( 14 . 16 ) with a lamp base ( 26 ), wherein the first electrode element ( 14 ) as a cathode element ( 18 ) and the second electrode element ( 16 ) as an anode element ( 20 ), and wherein the anode element ( 20 ) relative to the cathode element ( 18 ) has a larger diameter, and wherein the cathode element ( 18 ) and the anode element ( 20 ) substantially along a longitudinal axis ( 30 ) are arranged through the lamp base ( 26 ), characterized in that the cathode element ( 18 ) on the lamp base ( 26 ) closer side of the discharge space ( 12 ) and the anode element ( 20 ) for the most part thermal decoupling of the anode element ( 20 ) from the lamp base ( 26 ) on the lamp base ( 26 ) farther side of the discharge space ( 12 ) is arranged. DC high-pressure gas discharge lamp according to claim 1, characterized in that the first and second current carrying conductors ( 22 . 24 ) are substantially parallel to each other. DC high-pressure gas discharge lamp according to claim 1 or 2, characterized in that the diameter of the anode element ( 20 ) to the diameter of the cathode element ( 18 ) is located in the ratio of 0.2 to 0.5.