High pressure discharge lamp
View Patent ↗In various embodiments, a high pressure discharge lamp is provided. The high pressure discharge lamp may include a lamp axis, and a two-ended discharge vessel that surrounds a discharge volume, electrodes extending into the discharge volume enveloped by the discharge vessel, and a fill that includes metal halides being accommodated in the discharge volume, the discharge vessel being surrounded by an outer bulb with a base at one end and being held therein by a frame, wherein the frame comprises a short supply lead and a long supply lead, the long supply lead comprising two straight conductors with a winding part therebetween, the winding part executing at most 1.25 turns about the discharge vessel.
1. A high pressure discharge lamp, comprising:
a lamp axis,
and a two-ended discharge vessel that surrounds a discharge volume,
electrodes extending into the discharge volume enveloped by the discharge vessel,
and a fill that includes metal halides being accommodated in the discharge volume,
two capillaries extending outwards along the lamp axis in a direction opposite the electrodes,
the discharge vessel being surrounded by an outer bulb with a base at one end and being held therein by a frame,
wherein the frame comprises a short supply lead and a long supply lead, the long supply lead comprising two straight conductors with a winding part therebetween, the winding part executing at most 1.25 turns about the discharge vessel
wherein the straight conductors extend from the capillary into the zone that lies between the end of the discharge volume and the tip part of the electrode
wherein the straight conductors extend from the end of the discharge vessel up to at least the tip of the adjacent electrode.
2. The high pressure discharge lamp as claimed in claim 1 , wherein the winding part executes one turn.
3. The high pressure discharge lamp as claimed in claim 1 , wherein the winding part executes at least 0.25 turns.
4. The high pressure discharge lamp as claimed in claim 3 , wherein the winding part lies in a plane transverse to the lamp axis.
5. The high pressure discharge lamp as claimed in claim 1 , wherein the winding part lies in a plane at an inclination to the lamp axis.
6. The high pressure discharge lamp as claimed in claim 1 , wherein it holds for the axial length H and the radius R of the winding part that: 0≦H/R≦3.0.
7. The high pressure discharge lamp as claimed in claim 6 , wherein it holds for the axial length H and the radius R of the winding part that: 0≦H/R≦2.5.
8. The high pressure discharge lamp as claimed in claim 1 , wherein it holds for the axial length H and the radius R of the winding part that: 0.35≦H/R≦2.4.
9. The high pressure discharge lamp as claimed in claim 1 , wherein the outer bulb has an inside diameter of at most 70 mm.
10. The high pressure discharge lamp as claimed in claim 1 , wherein the operating current is at least 1.7 A.
11. The high pressure discharge lamp as claimed in claim 1 , wherein the fill has as metal halide at least CeI3 in a quantity of 2% by weight.
12. The high pressure discharge lamp as claimed in claim 1 , wherein the discharge vessel has a central cylindrical part and two rounded ends.