High pressure discharge lamp
View Patent ↗A high pressure discharge lamp ( 10 ), which is particularly a motor vehicle headlight, comprises a high pressure discharge burner ( 12 ) for emitting light supported by at least one leg ( 24 ), preferably three or four legs ( 24 ). By means of the legs ( 24 ) the burner ( 12 ) is mechanically connected to a socket ( 14 ) of the high pressure discharge lamp ( 10 ). According to the invention the legs ( 24 ) are part of a holder ( 16 ), which comprises further a ring ( 18 ) surrounding the socket ( 14 ), whereby the ring ( 18 ) is one-piece with the legs ( 24 ). Due to the design of the holder ( 16 ) as ring ( 18 ) with protruding legs ( 24 ) the heat of the burner ( 12 ) is conducted from the burner ( 12 ) via the legs ( 24 ) to the ring ( 18 ) by heat conduction. From the ring ( 18 ) the heat is led away to the environment by convection. This leads to a significant cooler Temperature of the holder ( 16 ) with respect to the burner ( 12 ), so that the material of the socket ( 14 ) needs not to be selected with respect to a good heat resistance. Thus, the use of more cost efficient materials is possible to deal with the hot burner ( 12 ).
1. A high pressure discharge lamp comprising
a high pressure discharge burner for emitting light said burner having a proximal end and a distal end;
a holder comprising a plurality of legs, by which the burner is supported at the proximal end;
a socket, to which the holder is mechanically connected;
whereby the holder comprises a ring, said ring being one-piece with at least one leg of said plurality of legs and surrounding the socket;
wherein the socket comprises protrusions that, when connected to the holder, are surrounded by the ring, each one of said plurality of legs extends a greater distance in a direction towards said distal end than the socket extends in said direction.
2. The high pressure discharge lamp according to claim 1 , wherein the ring comprises an inner surface radially pointing towards the socket and at least one leg of said plurality of legs protrudes from the ring next to the inner surface.
3. The high pressure discharge lamp according to claim 1 , wherein at least one leg of said plurality of legs is connected to the ring radially spaced outwards with respect to the socket.
4. The high pressure discharge lamp according to claim 1 , wherein the ring comprises radially pointing surfaces and an axially pointing cooling surface, wherein the ratio of the area of the cooling surface to the area of radially pointing surfaces of the ring is ≧0.5.
5. The high pressure discharge lamp according to claim 1 , wherein the socket comprises a recess for arranging at least one leg of said plurality of lees.
6. The high pressure discharge lamp according to claim 1 , wherein the ring comprises a cooling rip.
7. The high pressure discharge lamp according to claim 1 , wherein the socket comprises a metal housing thermally connected to the holder.
8. The high pressure discharge lamp according to claim 7 , wherein the holder is fixed to the housing.
9. The high pressure discharge lamp according to claim 7 , wherein the holder is one-piece with the housing.
10. The high pressure discharge lamp according to claim 1 , wherein the ring comprises radially pointing surfaces and an axially pointing cooling surface, wherein the ratio of the area of the cooling surface to the area of radially pointing surfaces of the ring is ≧1.0.
11. The high pressure discharge lamp according to claim 1 , wherein the ring comprises radially pointing surfaces and an axially pointing cooling surface, wherein the ratio of the area of the cooling surface to the area of radially pointing surfaces of the ring is ≧2.5.
12. The high pressure discharge lamp according to claim 1 , wherein the ring comprises radially pointing surfaces and an axially pointing cooling surface, wherein the ratio of the area of the cooling surface to the area of radially pointing surfaces of the ring is ≧3.5.
13. The high pressure discharge lamp according to claim 1 , wherein the holder and/or a housing of the socket are made from a metal.
14. The high pressure discharge lamp according to claim 13 , wherein the holder is one-piece with the housing.
15. The high pressure discharge lamp according to claim 1 , wherein the burner comprises a bush; and at least one leg of said plurality of legs is fixed to said bush by a weld.