WO2011069764A1

WO2011069764A1 - Discharge vessel consisting of ceramic for a high‑pressure discharge lamp

Info

Publication number: WO2011069764A1
Application number: PCT/EP2010/067089
Authority: WO
Inventors: Clemens Barthelmes; Peter Stadahl; Bernhard Freisinger; Andreas Hohlfeld
Original assignee: Osram Gesellschaft mit beschränkter Haftung
Priority date: 2009-12-09
Filing date: 2010-11-09
Publication date: 2011-06-16
Also published as: DE102009047753A1

Abstract

Discharge vessel consisting of ceramic for a high‑pressure discharge lamp The ceramic discharge vessel has an outer contour with tapering ends, on which capillaries rest. At the same time, the inner contour is configured such that a central part is cylindrical and substantially planar end faces terminate the capillaries.

Description

Title: ceramic discharge vessel of a ^{high-pressure} discharge lamp

Technical area

The invention relates to a discharge vessel for ei ^¬ ne high pressure discharge lamp according to the preamble of claim 1. These are in particular high-pressure discharge Slam ^¬ pen with metal halide.

State of the art

From EP 587 238 a ceramic discharge vessel for a Hochdruckent charge lamp is known, which describes a zy ^¬- cylindrical discharge volume with a fixed inner diameter and length. Such discharge vessels are sorted ^¬ but little isothermal.

From EP-A 335 202 an elongated ceramic discharge vessel is known, in which the stopper is shaped so that at the end of the discharge vessel, a groove runs around, in which the filling can condense.

From US Pat. No. 5,936,351 a metal halide filling ceramic discharge vessel is known which greatly improves isothermal by rounding off the ends. However, a disadvantage of this shape is that the condensate frequently enters the capillary.

US-B 6,175,188 discloses a ceramic discharge vessel ^¬ whose shape is bulged, but which additionally has a local bump, see FIG. 7 From DE 10 2007 061 515 a ceramic Entla ^¬ tion vessel is known, which is rounded and has local recesses for the condensate. It's all quite complicated ^¬ recently designed and therefore difficult to produce. The wells for the condensate are also designed so that they hold the condensate poorly.

Presentation of the invention

An object of the present invention is to provide a ceramic discharge vessel which allows improved focusing of the cold spot.

This object is solved by the characterizing features ^¬ times of claim 1.

Particularly advantageous embodiments can be found in the dependent claims. So far you could reach the isothermal a ceramic ^discharge vessel only at the expense of poor focusing of the cold spot.

According to the invention both aspects are now achieved simultaneously: high isotherm due to a curved outer contour with tapered end sections, which follows in particular the design rule from US 5,936,351. Nevertheless, a good focus of the cold spot is now achieved by the curved outer contour is inscribed a cylindrical inner contour. In the simplest case, this is again designed as it inevitably results from EP 587 238. To this goal Care must be taken to achieve in the manufacture, that the end portions are sufficiently dockwandig ge ^¬ formed in order to cut out the corners. As an outer contour with tapered end portions can, in particular a cylinder having hemispherical ends th making ^¬ be used, or directly a spherical outer contour. At the ends sit each capillaries. At the point of entry of the capillary in the discharge space ^¬ the capillary can be funnel-shaped or cup-shaped widened.

In a preferred embodiment, the discharge vessel has at the corner line of the inner contour a bulge, which acts as a circumferential groove. The middle part is cylindrical. Preferably, the end face, which is normally flat, designed so that it is widened in a funnel shape and this funnel shape steadily merges into the Aus ^¬ buchtung, with a turning point between Kapilla ^¬ re and bulge is. This creates a broad-shouldered basin for the condensate. However, the outlet of the capillary can also be sharp-edged, without a funnel.

However, the outlet of the capillary can also be cup-shaped in the sense of a spherical segment. In this case, there is a portion of the face that is flat. Only then is a relatively narrow-shouldered Aus ^¬ bucht scheduled.

In a further embodiment, the inner contour is strictly rectangular, as known per se and there is a rectangular depression at the outlet of the capillary. Although this inner shape is known per se, it is not known in with an outer contour with tapered ends. An extra trough for the condensate is not required here ^¬ .

Such discharge vessel can be made very well integrally from one piece or from two symmetrical halves.

A multi-part embodiment is designed, for example, so that the outer contour of the discharge vessel is ku ^¬ gel-shaped or even with spherical segment-shaped ends is taltet-staltet. There are narrow-shouldered bulges at the ends, connected with a rectangular depression. This is formed by the fact that the capillaries are separate components that do not reach to the end face. Rather, the discharge vessel is designed here so that extends at the ends of a narrow collar axially parallel to the rear towards the capillary. The separate capillary is basically tubular. It has a short section corresponds charge side, in which the outer diameter is reduced and ^¬ is just adapted to the inner diameter of the collar. Capillary and discharge vessel are preferably connected to each other by direct sintering. But it is also a seal using ceramic or glass solder possible.

Similarly, the discharge vessel can also be constructed in several parts from symmetrical components, namely halves of the exemplary embodiment just described. The halves are connected centrally via a seam by means of direct ^sintering , as known ^per se. On a sink can be dispensed with. The capillaries extend to the end face. The outer contour can basically be designed isothermally, ie spherical or cylindrical with rounded ends, which in turn represent spherical segments. An elliptical contour is also possible. The capillaries can be with or without a sink. The depression may be funnel-shaped, cup-shaped or rectangular.

The depressions at the corners are preferably torus segments, which form circular segments in cross section.

The ceramic discharge vessel 20 is preferably made of Al 2 O 3 as known per se and may contain additives. Other ceramics such as sapphire, Dy203 or A1N can also be used.

Suitable fillers are known metal halide systems such as rare earth metal halides, sodium iodide, calcium iodide, thallium iodide etc. with or without mercury and noble gas.

The invention retains the curved outer contour. By varying the internal shape of the cold spot can be influenced. The advantages of the cylindrical shape and the curved shape are combined. Regardless of the burning position, a defined cold spot arises.

By specifically influencing the cold spot an optimized illumination in the combination Nati ^¬ on the burner is achieved with reflector into ^¬ special. Partial visually discernible geometric irregularities and Hellig ^¬ keitsunterschiede on the edge of the optically effective preparation ^¬ ches of the discharge volume can be further minimized. Brief description of the drawings

In the following, the invention will be explained in more detail with reference to several embodiments. The figures show:

1 shows a ceramic discharge vessel according to the invention;

2 to 6 each show a further embodiment of a ceramic discharge vessel;

Figure 7 is a reflector lamp with such discharge vessel ^¬.

PREFERRED EMBODIMENT OF THE INVENTION FIG. 1 shows a ceramic discharge vessel 1 for a metal halide lamp. This is example ^¬ example a 150 W lamp.

The burner ceramic 1 is composed of a cylindrical middle part 2 and two end sections or ends 3 together. Capillaries 4 attach integrally to the ends. The discharge vessel itself is symmetrically composed of two parts, which are connected to one another at a central seam 7.

The discharge vessel has a rounded shape on the outside. Here, the middle part 2 is cylindrical with a ge ^¬ given diameter outside and inside. In the area of the ends 3, the outer contour of tapered hemispherically toward the Ka ^¬ pillaren. 4

In contrast, the inner contour is designed very differently. It is substantially rectangular in cross-section and has over the length of the discharge volume substantially a constant inner diameter.

The capillary 4 opens in a funnel shape towards the discharge volume. This funnel-shaped depression 5 opens into an end face, which finally merges into a turn off ^¬ book tung 6, which sits as a circumferential groove at the end of the inner wall. 8

Figure 2 shows a further embodiment which is constructed similarity ^¬ Lich as in Figure 1. However, it has by no ne sink, but the capillary 4 sits directly with kon ^¬ stantem diameter of the bore 9 arranged therein on the discharge volume. Accordingly, the discharge ^¬ tube has a flat end face 10 which terminates at the bulge. 6 FIG. 3 shows a further exemplary embodiment, in which the depression assigned to the capillary 4 is designed as a cup 11. This cup ends at a teilwei ^¬ se, namely present as a circular ring, end face 10. Outside, this ends again at a bulge 6. Figure 4 shows a basic shape without bulge. Here, the usual corner 13 between the end face 10 and side wall 8 is present. A depression 12 on the capillary is rectangular. However, the outer contour is rounded as explained above. In this case, the middle part 2 is cylindrical with a given diameter outside and inside. In the region of the ends 3, the outer contour tapers towards the capillaries 4 in a hemispherical manner.

Another outer contour for a discharge vessel 1 shows the embodiment of FIG. 5. Here, the outer contour 20 spherical. At the ends of this contour is parallel to the axis bent into a collar 21 which extends a short distance in the direction of the capillary 4. The Ka ^¬ pillare 4 itself is separate. In principle, it has a constant outer diameter, but in the vicinity of the collar 21, a short portion 22 is designed so that its outer diameter is reduced and is adapted from the inside just the inner diameter of the collar 21. The rest has a larger outer diameter, so that a stop 24 for the capillary 4 in the direction of the collar 21 is formed. These two parts are connected by direct sintering.

The capillary is so short that it does not reach right up to the discharge volume, but leaves itself a disc-shaped depression 23, rectangular in cross-section.

Again, the inner contour of the discharge volume is designed so that substantially a cylindrical Entla ^¬ tion volume is created, apart from the sink 23 and the bulges 6 at the corners. In this embodiment, the discharge vessel is in one piece.

A similar embodiment is shown in FIG 6. The Un ^¬ terschied is only that the discharge vessel is in two pieces and is assembled from two halves 25 which are connected to each other over the seam. 7 In addition, here the capillary 4 is drawn so long in the direction of discharge ^volume that it forms a flat surface, so that it is part of the end face 10 of the discharge vessel. Also here are bulges 6 available. A complete reflector lamp 30 is shown in FIG 7. Here, the discharge vessel 1 in Figure 1 as an installation fixture is used ^¬ det. It is surrounded by an outer bulb 14 and supported by a frame 15. This is in turn surrounded by a cylindrical tube 35 as explosion protection. At a bruise of the outer bulb sits a base 17th

On the base 17, a reflector 34 is also attached. This consists of a reflector contour 18, an attached thereto in the direction of base 17 neck 19 and an opening 38. In the region of the opening, the end of the tube 35 is surrounded by a glare shield 39 with cap 16.

Suitable fillers are known metal halide systems such as rare earth metal halides, sodium iodide, calcium iodide, thallium iodide etc. with or without mercury and noble gas. Essential features of the invention in the form of a nume ^¬ tured list are:

1. Discharge vessel for a high-pressure discharge lamp made of ceramic material, with a filling, which can form a condensate, receiving middle part, as well as with two ends, where capillaries sit ^¬ zen, wherein in the capillary electrode systems abge ^{¬ are} sealed, characterized that the Ent ^¬ discharge vessel has an outer contour which is cylindrical be ^¬ area of the central portion, and tapering at the ends to the capillaries out while the inner contour is configured such that the central part inside has a cylindrical side wall ^¬ and towards the capillary towards a substantially ge ^¬ rade face. 2. Discharge vessel according to claim 1, characterized in that in the region of the meeting zwi ^¬ 's side wall and end face a circumferential bulge, which is capable of feeding condensate gee, is present.

3. Discharge vessel according to claim 1, characterized marked ^¬ characterized in that in the area where the capillary opens into the end face, a depression in the end face is present. 4. Discharge vessel according to claim 1, characterized marked ^¬ characterized in that the depression is funnel-shaped or cup-shaped.

5. Discharge vessel according to claim 1, characterized marked ^¬ characterized in that the outer contour of the central part is cylindrically or partially ellipsoidal or spherical.

6. Discharge vessel according to claim 1, characterized marked ^¬ characterized in that the ends taper as a segment of a sphere, an ellipsoid or paraboloid. 7. Discharge vessel according to claim 1, characterized marked ^¬ characterized in that the central part and the ends are manufactured einstü ^¬ ckig, wherein at each end a collar extends in the direction of a separate capillary into which a portion of the capillary is fitted, the has a reduced outer diameter. Metal halide discharge lamp with a discharge vessel according to one of the preceding claims.

Reflector lamp or lamp with a Entladungsge barrel according to one of the preceding claims.

Claims

claims

1. Discharge vessel for a high-pressure discharge lamp made of ceramic material, with a filling, which can form a condensate, receiving middle part, as well as with two ends where capillaries sit zen, wherein in the capillary electrode systems are abge ^¬ seals, characterized in that Ent ^¬ the discharge vessel has an outer contour which is cylindrical be ^¬ area of the central portion, and tapering at the ends to the capillaries out while the inner contour is designed so that the

Central part inside a cylindrical side wall on ^¬ has and the capillary towards a substantially ge ^¬ rade face.

2. Discharge vessel according to claim 1, characterized thereby marked, that in the area of overlapping Zvi ^¬'s side wall and end face of a circumferential recess, which is suitable for Condensate is spei ^¬ Chern, exist.

3. Discharge vessel according to claim 1, characterized in that in the area where the capillary into the

End face opens, a sink is present in the end face.

4. Discharge vessel according to claim 1, characterized in that the depression is funnel-shaped or cup-shaped.

5. Discharge vessel according to claim 1, characterized in that the outer contour of the middle part is cyclically is cylindrical or partially ellipsoidal or spherical.

6. Discharge vessel according to claim 1, characterized marked ^¬ characterized in that the ends taper as a segment of a sphere, an ellipsoid or paraboloid.

7. Discharge vessel according to claim 1, characterized in that the middle part and the ends are manufactured einstü ^¬ ckig, wherein at each end a collar extends in the direction of a separate capillary into which a portion of the capillary is fitted, the has a reduced outer diameter.

8. metal halide discharge lamp with a Entla ^¬ tion vessel according to one of the preceding claims.

9. reflector lamp or lamp with a Entladungsge ^¬ vessel according to one of the preceding claims.