Bulb for discharge lamps
View Patent ↗A bulb for a discharge lamp, includes an inner burner chamber, the outer contour of the bulb and the burner chamber each having a central region and adjacent edge regions, each central region being toroidal, and each edge region of the burner chamber adapted to be in the form of a truncated cone away from the central region and rotationally symmetrically with respect to the bulb axis, at a specific angle of taper. The midpoints of the circle segments, which form the central region of the outer contour and of the burner chamber, have a distance in the direction of the bulb axis; and/or the angles of taper of the two edge regions of the burner chamber are not the same; and/or the bulb axis lies between the circle segment, which forms the central region of the outer contour and/or of the burner chamber, and its midpoint.
1. A bulb for a discharge lamp, which comprises an inner burner chamber,
the outer contour of the bulb and the burner chamber each having a central region and adjacent edge regions,
each central region being toroidal such that the section through the central region with any desired plane containing the bulb axis comprises a circle segment which has a segment radius r and whose midpoint is spaced apart from this bulb axis by a non-zero rotation radius R,
the midpoints of the circle segments, which form the central region of the outer contour and of the burner chamber, have a distance z in the direction of the bulb axis; and/or
the bulb axis lies between the midpoint of the circle segment, which forms the central region of the outer contour and/or of the burner chamber, and this circle segment.
2. A bulb for a discharge lamp, which comprises an inner burner chamber,
the outer contour of the bulb and the burner chamber each having a central region and adjacent edge regions,
each central region being toroidal such that the section through the central region with any desired plane containing the bulb axis comprises a circle segment which has a segment radius r and whose midpoint is spaced apart from this bulb axis by a rotation radius R, and each edge region of the burner chamber being in the form of a truncated cone away from the central region and rotationally symmetrical with respect to the bulb axis, at a specific angle of taper α,
the angles of taper α 1 , α 2 of the two edge regions of the burner chamber are not the same.
3. The bulb for a discharge lamp as claimed in claim 2 , wherein the midpoints of the circle segments, which form the central region of the outer contour and of the burner chamber, have a distance z in the direction of the bulb axis; and/or
the bulb axis lies between the midpoint of the circle segment, which forms the central region of the outer contour and/or of the burner chamber, and this circle segment.
4. The bulb for a discharge lamp as claimed in claim 1 , wherein the midpoints of the circle segments, which form the central region of the outer contour and of the burner chamber, have a distance z in the range from 0 to 1 mm in the direction of the bulb axis.
5. The bulb for a discharge lamp as claimed claim 2 , wherein the angle of taper α 1 of a first of the two edge regions of the burner chamber is in the range between 22° and 60°.
6. The bulb for a discharge lamp as claimed in claim 2 , wherein the angle of taper α 2 of a second of the two edge regions of the burner chamber is in the range between 0° and 30°.
7. The bulb for a discharge lamp as claimed in claim 5 , wherein the first of the edge regions faces a reflector.
8. The bulb for a discharge lamp as claimed in claim 1 , wherein the circle segment of the central region of the burner chamber has a radius of 2.2 to 4 mm.
9. The bulb for a discharge lamp as claimed in claim 1 , wherein the circle segment of the outer contour has a radius of 6 to 8 mm.
10. The bulb for a discharge lamp as claimed in claim 1 , wherein the circle segment, which forms the central region of the outer contour and/or of the burner chamber, is displaced towards the bulb axis such that the wall thickness of the bulb is 1.5 to 3 mm in the central region.
11. The bulb for a discharge lamp as claimed in claim 3 , wherein the midpoints of the circle segments, which form the central region of the outer contour and of the burner chamber, have a distance z in the range from 0 to 1 mm in the direction of the bulb axis.
12. The bulb for a discharge lamp as claimed claim 3 , wherein the angle of taper α 1 of a first of the two edge regions of the burner chamber is in the range between 22° and 60°.
13. The bulb for a discharge lamp as claimed in claim 3 , wherein the angle of taper α 2 a second of the two edge regions of the burner chamber is in the range between 0° and 30°.
14. The bulb for a discharge lamp as claimed in claim 5 , wherein the angle of taper α 2 of a second of the two edge regions of the burner chamber is in the range between 0° and 30°.
15. The bulb for a discharge lamp as claimed in claim 6 , wherein the first of the edge regions faces a reflector.