Dimmable discharge lamp for dielectrically impeded discharges
AssigneePatent-Treuhand-Gesellschaft fuer elektrische Gluehlampen mbH
InventorsFrank Vollkommer, Lothar Hitzschke
Life of this patent
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Abstract
The discharge spacings in discharge lamps for dielectrically impeded discharges are shortened below 3 mm, as a result of which dead times of pulsed active-power injecting can be increased so strongly, for example beyond 50 ms, that the dimming properties of the discharge lamp are greatly improved.
Claims19
A discharge lamp having a discharge vessel, containing a discharge medium, an electrode arrangement with at least one anode (1, 6, 7, 12, 13, 17, 25, 29, 32) and at least one cathode (3, 4, 9, 10, 15, 19, 22, 24, 26, 30, 31), which define a small discharge spacing (b) of 3 mm or less, and having a dielectric layer between at least the anode (1, 6, 7, 12, 13, 17, 25, 29, 32) and the discharge medium, characterized in that at least two separately operable electrode groups (1, 2, 5-8, 11, 12;
- 2-5, 8-11;
- 13, 14, 16-18;
- 14-16, 18-20;
- 26, 27;
- 26, 27, 28) are provided in the case of at least one (2-5, 8-11, 14-16, 18-20, 26, 27, 28) of which the small discharge spacing (b) is present, and which differ from one another with reference to the discharge spacing (b).
A method for operating a discharge lamp comprising the steps of:
- providing a discharge lamp having a discharge vessel, containing a discharge medium, an electrode arrangement with at least one anode (1, 6, 7, 12, 13, 17, 25, 29, 32) and at least one cathode (3, 4, 9, 10, 15, 19, 22, 24, 26, 30;
- 31), which define a small discharge spacing (b) of 3 mm or less, and having a dielectric layer between at least the anode (1, 6, 7, 12, 13, 17, 25, 29, 32) and the discharge medium, and
- varying power injected into the discharge lamp by varying a dead time between active-power pulses of a pulsed power supply.
Dependencies are inferred from the claim text.