Ceramic bushing for a high-pressure discharge lamp
View Patent ↗A bushing for a high-pressure discharge lamp, which is suitable for connecting an electrode in the interior of a ceramic discharge vessel to a supply lead in a gastight manner on the exterior of the discharge vessel, wherein the bushing is an electrically conductive ceramic composite consisting of a mixture of LaB 6 and at least one second material from the group Al 2 O 3 , Dy 2 Al 5 O 12 , AlN, AlON and Dy 2 O 3 is disclosed.
1. A bushing for a high-pressure discharge lamp, which is suitable for connecting an electrode in the interior of a ceramic discharge vessel to a supply lead in a gastight manner on the exterior of the discharge vessel, wherein the bushing is an electrically conductive ceramic composite consisting of a mixture of LaB 6 and at least one second material Dy 2 Al 5 O 12 .
2. The bushing as claimed in claim 1 , wherein the bushing is a pin.
3. The bushing as claimed in claim 1 , wherein the proportion of LaB 6 is between 95 and 30% by volume.
4. The bushing as claimed in claim 3 , wherein the proportion of LaB 6 is between 80 and 50% by volume.
5. An electrode for a high-pressure discharge lamp, which is connected to a bushing, which is suitable for connecting the electrode in the interior of a ceramic discharge vessel to a supply lead in a gastight manner on the exterior of the discharge vessel, wherein the bushing is an electrically conductive ceramic composite consisting of a mixture of LaB 6 and at least one second material Dy 2 Al 5 O 12 .
6. The electrode as claimed in claim 5 , wherein the electrode and the bushing are produced integrally from the ceramic composite.
7. A high-pressure discharge lamp having a bushing, which is suitable for connecting an electrode in the interior of a ceramic discharge vessel to a supply lead in a gastight manner on the exterior of the discharge vessel, wherein the bushing is an electrically conductive ceramic composite consisting of a mixture of LaB 6 and at least one second material Dy 2 Al 5 O 12 wherein the discharge vessel is produced from ceramic material.
8. The high-pressure discharge lamp as claimed in claim 7 , wherein the discharge vessel is produced from PCA.
9. The high-pressure discharge lamp as claimed in claim 7 , wherein the discharge vessel has a tubular end part in which a pin-like bushing is sealed either by means of glass solder or by means of direct sintering-in.