Title:
MERCURY-FREE HIGH-PRESSURE GAS DISCHARGE LAMP
Document Type and Number:
WIPO Patent Application WO2003067622
Kind Code:
A3
Abstract:
A high-pressure gas discharge lamp (HID [high intensity discharge] lamp) is described which is free from mercury and suitable in particular for use in automotive technology. The lamp is particularly remarkable in that a rise in temperature of the coldest (lowermost) bottom regions (10) is achieved by an asymmetrical electrode arrangement, such that the light-generating substances accumulated in said regions enter the gas phase in a sufficient quantity upon switching-on of the lamp. The temperature of the hottest (uppermost) wall regions (13) is not raised thereby, indeed, it may even be reduced. An essential advantage of this lamp is that its external shape, its dimensions, and the electrodes (3) themselves need not be changed when the lamp is operated in a horizontal position with vertically aligned pinches (5), while the electrodes (3) are fastened each to a metal foil (4) in a suitable downwardly-shifted position.
Inventors:
HAACKE MICHAEL (DE)
MUCKEL RALF (DE)
MUCKEL RALF (DE)
Application Number:
PCT/IB2003/000341
Publication Date:
October 21, 2004
Filing Date:
January 29, 2003
Export Citation:
Assignee:
PHILIPS INTELLECTUAL PROPERTY (DE)
KONINKL PHILIPS ELECTRONICS NV (NL)
HAACKE MICHAEL (DE)
MUCKEL RALF (DE)
KONINKL PHILIPS ELECTRONICS NV (NL)
HAACKE MICHAEL (DE)
MUCKEL RALF (DE)
International Classes:
F21S8/12; H01J1/00; H01J17/20; H01J61/88; H01J61/18; H01J61/24; H01J61/35; H01J61/36; H01J61/82; H01J61/84; H01J; (IPC1-7): H01J61/24; H01J61/82; H01J61/18; H01J61/35
Foreign References:
| EP1063681A2 | 2000-12-27 | |||
| DE2535922A1 | 1977-03-03 | |||
| US4001623A | 1977-01-04 | |||
| EP1011126A2 | 2000-06-21 |
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