High-Pressure Discharge Lamp

• US 20090009084A1
• Filed: 02/06/2007
• Published: 01/08/2009
• Est. Priority Date: 02/15/2006
• Status: Active Grant

• Current Assignee: OSRAM GmbH (Ams-Osram AG)
• Original Assignee: OSRAM GmbH (Ams-Osram AG), Haftung Beschrankter
• Inventors: Bonigk, Michael, Lau, Matthias, Roth, Melanie, Grundmann, Dirk, Naujoks, Andreas
• Granted Patent: US 8,013,508 B2
• Time in Patent Office: Days
• US Class Current: 313/633
• CPC Class Codes: H01J 61/35 provided with coatings on the walls thereof; Selection of materials for the coatings using coloured coatings H01J61/40; using luminescent coatings H01J61/42
• CPC Class Codes: H01J 61/547 using an auxiliary electrode outside the vessel H01J61/544 takes precedence

Abstract

The invention relates to a high-pressure discharge lamp having a discharge vessel (10) sealed at both ends, a filling which can be ionized and is enclosed in the discharge area (106) of the discharge vessel (10), and electrodes (11, 12) which extend into the discharge area (106), in order to produce a gas discharge, with the discharge vessel (10) having an electrically conductive coating (107) which is designed as a starting aid and is arranged at least in the boundary area (109) between the discharge area (106) and a first sealed end (102) of the discharge vessel (10).

Claims

1. A high-pressure discharge lamp with a discharge vessel (10) which is sealed at two ends, an ionizable filling which is enclosed in the discharge space (106) of the discharge vessel (10) and electrodes (11, 12), which extend into the discharge space (106), for generating a gas discharge, the discharge vessel (10) having an electrically conductive coating (107), characterized in that the coating (107) is in the form of an ignition aid and is arranged at least in the boundary region (109) between the discharge space (106) and a first sealed end (102) of the discharge vessel (10).

2. The high-pressure discharge lamp as claimed in claim 1, the coating (107) additionally being arranged in the boundary region (108) between the discharge space (106) and the second sealed end (101) of the discharge vessel (10).

3. The high-pressure discharge lamp as claimed in claim 1, the coating (107) extending in the boundary region (109) or in the boundary regions (108, 109) over the entire circumference of the discharge vessel (10).

4. The high-pressure discharge lamp as claimed in claim 1, the coating (107) additionally being arranged on a surface section of the first sealed end (102).

5. The high-pressure discharge lamp as claimed in claim 1, the coating (107) extending on a surface section of that part of the discharge vessel (10) which surrounds the discharge space (106).

6. The high-pressure discharge lamp as claimed in claim 1, it being possible for the ignition voltage required for igniting the gas discharge in the high-pressure discharge lamp to be applied to the power supply line (14) which is passed out of the first sealed end (102).

7. The high-pressure discharge lamp as claimed in claim 1 which is provided for operation in the horizontal position, with electrodes (11, 12) arranged in a horizontal plane, the coating (107) being arranged on the surface section of that part of the discharge vessel (10) which surrounds the discharge space (106) beneath the electrodes (11, 12).

8. The high-pressure discharge lamp as claimed in claim 1, the coating (107) being designed to be transparent.

9. The high-pressure discharge lamp as claimed in claim 1, the boundary region (109) or the boundary regions (108, 109) being in the form of an annular groove in the discharge vessel surface which surrounds the discharge vessel (10).

10. The high-pressure discharge lamp as claimed in claim 1, the power supply line (14), which is passed out of the first sealed end (102) of the discharge vessel (10), being connected to at least one molybdenum foil (104) embedded in the first sealed end (102), and the at least molybdenum foil (104) being oriented in such a way that one of its two sides faces the coating (107) arranged on the surface section of the first sealed end (102).

11. The high-pressure discharge lamp as claimed in claim 2, the coating (107) extending in the boundary region (109) or in the boundary regions (108, 109) over the entire circumference of the discharge vessel (10).

12. The high-pressure discharge lamp as claimed in claim 2, the coating (107) additionally being arranged on a surface section of the first sealed end (102).

13. The high-pressure discharge lamp as claimed in claim 2, the coating (107) extending on a surface section of that part of the discharge vessel (10) which surrounds the discharge space (106).

14. The high-pressure discharge lamp as claimed in claim 2, it being possible for the ignition voltage required for igniting the gas discharge in the high-pressure discharge lamp to be applied to the power supply line (14) which is passed out of the first sealed end (102).

15. The high-pressure discharge lamp as claimed in claim 2 which is provided for operation in the horizontal position, with electrodes (11, 12) arranged in a horizontal plane, the coating (107) being arranged on the surface section of that part of the discharge vessel (10) which surrounds the discharge space (106) beneath the electrodes (11, 12).

16. The high-pressure discharge lamp as claimed in claim 2, the coating (107) being designed to be transparent.

17. The high-pressure discharge lamp as claimed in claim 2, the boundary region (109) or the boundary regions (108, 109) being in the form of an annular groove in the discharge vessel surface which surrounds the discharge vessel (10).

18. The high-pressure discharge lamp as claimed in claim 2, the power supply line (14), which is passed out of the first sealed end (102) of the discharge vessel (10), being connected to at least one molybdenum foil (104) embedded in the first sealed end (102), and the at least molybdenum foil (104) being oriented in such a way that one of its two sides faces the coating (107) arranged on the surface section of the first sealed end (102).