High-pressure discharge lamp having a single socket
A high-pressure discharge lamp having a single socket, comprising: a discharge vessel ( 100 ) having two opposite sealed ends ( 120, 130 ) and a discharge chamber ( 110 ) arranged between the sealed ends ( 120, 130 ), a first sealed end ( 120 ) extending into a lamp base ( 400 ) and the second sealed end ( 130 ) protruding out of the lamp base ( 400 ), a first electrode ( 20 ) which is fixed in the first sealed end ( 120 ) of the discharge vessel ( 100 ) and has an end on the discharge side extending into the discharge chamber ( 110 ), a second electrode ( 30 ) which is fixed in the second sealed end ( 130 ) of the discharge vessel ( 100 ) and has an end on the discharge side extending into the discharge chamber; and ( 110 ), a base flange ( 420 ) arranged on the lamp base ( 400 ) and defining a plane ( 421 ) which is usable for adjusting the high-pressure discharge lamp in an optical system wherein for the distance A from the end of the first electrode ( 20 ) on the discharge side to the plane ( 421 ) of the base flange ( 420 ) and for the distance B from the end of the second electrode ( 30 ) on the discharge side to the plane ( 421 ) of the base flange ( 420 ), the following relation applies: 15.0 mm ≤ A + B 2 ≤ 27.0 mm .
1. A high-pressure discharge lamp having a single socket, comprising:
a discharge vessel having two opposite sealed ends and a discharge chamber arranged between the sealed ends, a first sealed end extending into a lamp base and the second sealed end protruding out of the lamp base;
a first electrode which is fixed in the first sealed end of the discharge vessel and has an end on the discharge side extending into the discharge chamber;
a second electrode which is fixed in the second sealed end of the discharge vessel and has an end on the discharge side extending into the discharge chamber; and
a base flange arranged on the lamp base and defining a plane which is usable for adjusting the high-pressure discharge lamp in an optical system,
wherein for the distance A from the end of the first electrode on the discharge side to the plane of the base flange and for the distance B from the end of the second electrode on the discharge side to the plane of the base flange, the following relation applies:
15.0
mm
≤
A
+
B
2
≤
27.0
mm
.
2. The high-pressure discharge lamp having a single socket as claimed in claim 1 , the sealed ends each having a tubular extension and an outer envelope surrounding the discharge vessel being fixed to the tubular extensions.
3. The high-pressure discharge lamp having a single socket as claimed in claim 2 , the tubular extension of the first sealed end and of the outer envelope advantageously extending into the lamp base so that a first current feed for the first electrode is surrounded by the tubular extension and the outer envelope, wherein the length C of a section of the tubular extension of the first sealed end extending out of the outer envelope has a value in the range of 1.0 mm to 11.0 mm.
4. The high-pressure discharge lamp having a single socket as claimed in claim 1 , wherein the base flange is made of plastics material.
5. The high-pressure discharge lamp having a single socket as claimed in claim 1 , wherein the lamp base is made of plastics material.
6. The high-pressure discharge lamp having a single socket as claimed in claim 1 , wherein the distance B-A between the ends of the electrodes on the discharge side is in the range of 3.2 mm to 3.8 mm.
7. The high-pressure discharge lamp having a single socket as claimed in claim 1 , wherein the optical distance between the ends of the electrodes on the discharge side is in the range of 3.6 mm to 4.2 mm.
8. The high-pressure discharge lamp having a single socket as claimed in claim 1 , wherein the high-pressure discharge lamp is a high-pressure halogen metal vapor discharge lamp which contains at least xenon and a halide of sodium and scandium in the discharge chamber.
9. The high-pressure discharge lamp having a single socket as claimed in claim 1 , configured as a vehicle headlamp having an electrical power consumption in the range of 20 Watt to 35 Watt.