High-pressure discharge lamp with an improved starting capability, as well as a high-voltage pulse generator
A spiral pulse generator is used to start the high-pressure discharge lamp, and is accommodated directly in the outer bulb of the lamp. The spiral pulse generator uses a material with a matched ∈ and μ.
1. A high-pressure discharge lamp comprising a discharge vessel accommodated in an outer bulb, wherein a starting device generates a high-voltage pulses in the lamp, characterized in that the starting device is accommodated in the outer bulb, wherein the starting device is a spiral pulse generator which is made from a heat-resistant material, wherein the heat resistant material is low temperature co-fired ceramic (LTCC), wherein this material comprises films of ceramic material and a metallic wetting agent, and wherein the ceramic material is a mixture of a first material and a second material, wherein the first material has a relative permittivity ∈ r of 2 to 1000 and the second material has a relative permeability μ r of 1 to 5000.
2. The high-pressure discharge lamp as claimed in claim 1 , characterized in that the starting device is held by a frame.
3. The high-pressure discharge lamp as claimed in claim 2 , wherein the frame also holds the outer bulb.
4. The high-pressure discharge lamp as claimed in claim 1 , characterized in that the relative permeability of the second material is at least μ r =1.5.
5. The high-pressure discharge lamp as claimed in claim 4 , characterized in that the second material is a metal oxide.
6. The high-pressure discharge lamp as claimed in claim 5 , wherein the second material is a metal oxide with a proportion of at least 15% by weight of the ceramic mixture.
7. The high-pressure discharge lamp as claimed in claim 1 , characterized in that the high voltage pulses imparted by the spiral pulse generator acts directly on two electrodes in the discharge vessel.
8. The high-pressure discharge lamp as claimed in claim 1 , characterized in that the high voltage pulses imparted by the spiral pulse generator act on an auxiliary starting electrode fitted to the outside of the discharge vessel.
9. The high-pressure discharge lamp as claimed in claim 1 , characterized in that the spiral pulse generator is constructed from a plurality of layers, wherein the number n of layers is at least n=5.
10. The high-pressure discharge lamp as claimed in claim 9 , characterized in that the number n of layers is at most n=500.
11. High-pressure discharge lamp as claimed in claim 10 , wherein the number n of layers is at most n=100.
12. The high-pressure discharge lamp as claimed in claim 1 , characterized in that the spiral pulse generator has an approximately hollow-cylindrical form.
13. High-pressure discharge lamp as claimed in claim 12 , wherein the approximately hollow-cylindrical form has an inner diameter of at least 10 mm.
14. The high-pressure discharge lamp as claimed in claim 1 , characterized in that the relative permittivity ∈ r of the spiral pulse generator is at least ∈ r =10.
15. The high-pressure discharge lamp as claimed in claim 1 , characterized in that a series resistor, which limits the charging current of the spiral pulse generator, is also accommodated in the outer bulb.