EP2737519A1 - Hochdruckentladungslampe mit zündhilfe - Google Patents
Hochdruckentladungslampe mit zündhilfeInfo
- Publication number
- EP2737519A1 EP2737519A1 EP12743130.2A EP12743130A EP2737519A1 EP 2737519 A1 EP2737519 A1 EP 2737519A1 EP 12743130 A EP12743130 A EP 12743130A EP 2737519 A1 EP2737519 A1 EP 2737519A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- container
- discharge lamp
- pressure discharge
- film
- electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/30—Vessels; Containers
- H01J61/34—Double-wall vessels or containers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
- H01J61/547—Igniting arrangements, e.g. promoting ionisation for starting using an auxiliary electrode outside the vessel
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
- H01J61/827—Metal halide arc lamps
Definitions
- the invention relates to a high-pressure discharge lamp ge ⁇ Frankfurtss the preamble of claim 1.
- Such lamps are in particular high-pressure discharge lamps for general lighting.
- US Pat. No. 5,811,933 discloses a high-pressure discharge lamp with a ceramic discharge vessel in which a starting aid is used.
- the ignition aid is a so-called UV enhancer. Similarity ⁇ royal is known from DE 20 2010 011 029. There, a Fo ⁇ lien electrode is described.
- 2010/131574 shows embodiments of a Geometrieva ⁇ riation the inner electrode. There, a further metal component in the UV enhancer is introduced in addition to the molybdenum foil, which favors the transport of the charge ⁇ lectric barrier discharge. This is costly.
- the object of the present invention is to provide a high-pressure discharge lamp whose ignition takes place reliably.
- UV radiation is used for the reliable ignition of krypton85-free high-pressure discharge lamps. This is often provided by UV enhancers.
- UV radiation in the wavelength range ⁇ 280 nm is required.
- UV enhancers without mercury with corresponding UV emission are necessary.
- the vessel of the UV enhancer may consist of quartz or another UV-transparent glass, especially toughened glass. Also solutions with a UV enhancer, in which the discharge vessel made of ceramic, are possible, provided that the discharge vessel is translucent in the UV.
- a Mo ⁇ lybdänfolie is provided, which ensures the gas-tight passage through the quartz glass and functions as a power supply.
- the inner electrode of the UV enhancer is the inner electrode of the UV enhancer.
- the power supply through the glass can also be done with a wire or pencil.
- appropriate techniques are to be used, as is generally known from the construction of ceramic discharge vessels.
- the ignition voltage of the UV enhancer is directly dependent on the distance from the inner electrode to the inner wall of the discharge vessel. SSES. This results in for different Basistechnolo ⁇ gies different approaches.
- UV enhancer with discharge vessel made of quartz glass fol ⁇ ing embodiments are advantageous.
- the portion of the molybdenum foil which is disposed inside the Entladungsgefä ⁇ SLI may be partially or completely curved. Thus, the distance to the inner wall is kept low. It is particularly preferred if the molybdenum foil can be clamped by a spring action between opposite inner walls of the normally cylindrical discharge vessel. This reduces the distance to the inner wall to the conceivable minimum.
- a high probability of a discharge in the UV enhancer is obtained in the area where the highest electric field strengths occur at the internal electrode. This is effectively achieved where there is the least distance between the external electrode and the inner electrode of the UV enhancer. For a high UV intensity of the UV enhancer, it is desirable to provide as many places as possible, at which there is a very small distance.
- a further possibility is to reduce the distance between the inner Molyb ⁇ dänfolie to an exhaust tube of the discharge vessel made of quartz glass ⁇ .
- a further embodiment is to shape the discharge vessel, in particular made of quartz glass, in such a way that, if applicable , the distance to the molybdenum foil is reduced again.
- This has the advantage that the molybdenum foil can be easier to thread in and then crushed or in a separate step after squeezing the quartz glass is deformed so that the distance to the molybdenum foil is deliberately reduced.
- the quartz glass then touches the molybdenum foil ⁇ .
- Such deformation may be local, such as in the middle of the discharge vessel or else especially where the external electrode is seated. But the deformation can also over a larger part of the discharge vessel or even over the entire discharge vessel.
- High field strengths are generally favored by the sharpest possible Fo ⁇ lien edges.
- the molybdenum foil used is doped insbeson ⁇ particular with yttrium, in particular 0.2 to 2 wt .-%.
- Further advantageous oxides are cerium oxide and lanthanum oxide.
- the oxides ⁇ se mentioned can also be used in mixture.
- the required vicinity of the inner electrode to the inner wall ⁇ by a wire can be achieved, which is spirally curved.
- customary fillings can be used, in particular noble gases such as argon, Penninggemische such as argon ⁇ further noble gas or mixtures of noble gases and halogens or halogen compounds such as in particular dibromomethane.
- noble gases such as argon, Penninggemische such as argon ⁇ further noble gas or mixtures of noble gases and halogens or halogen compounds such as in particular dibromomethane.
- fluorine compounds can preferably be used only in a ceramic UV enhancer or in a coated glass flask.
- To generate the UV radiation of the halogen dimers CI 2 *, Br 2 * and F 2 * is a filling of the UV enhancer with 100%
- Chlorine gas and the other above-mentioned gaseous halogen compounds and compounds with sufficient vapor pressure possible can be generated.
- unmixed or mixed noble gases helium, neon, argon, krypton and xenon
- the gaseous halogen Compounds mixed with the corresponding noble gases In some cases, combinations of noble gases can also be mixed in here.
- the pressure of the filling gas in the UV enhancer is in the range 1 mbar to 1 bar.
- the intensity of the UV radiation generated typically increases with the filling pressure, so that an upper limit ⁇ is obtained for the pressure from the ignition of the UV enhancer, which must be designed for the operating and control device of the lamp.
- UV enhancers with two electrodes
- further components such as a capacitor (US 4,987,344) or even more complex controls (US 4,721,888) is possible to the current through the UV enhancer limit.
- UV-enhancers have prevailed, which have an internal and external electrode and use a dielectric barrier Ent ⁇ charge. These UV enhancers are relatively inexpensive.
- High-pressure discharge lamp with ignition aid with a Entla ⁇ tion vessel, which is housed in an outer bulb, wherein a UV enhancer is housed in the outer bulb as a starting aid, wherein the UV enhancer a UV- transparent can-like container having inner wall and front side and longitudinal axis, wherein the container encloses with its inner wall a cavity which is filled with a gas which can emit UV radiation, characterized in that in the cavity an inner Fo ⁇ lienieri electrode having a end edge sits loading is accommodated so that at least a part of the front-side edge of the end face of the container is close to at least ⁇ , and wherein an external electrode is externally mounted in the vicinity of the container.
- High-pressure discharge lamp according to claim 1 characterized ge ⁇ indicates that the film-like electrode in the cavity extends substantially parallel to the longitudinal axis. 3. High-pressure discharge lamp according to claim 1, characterized ge ⁇ indicates that the length LF of the electrode in the cavity relative to the axial length L of the internal volume of the container is at least 0.9 and preferably min ⁇ least 1.0. 4. High-pressure discharge lamp according to claim 4, characterized ge ⁇ indicates that the length LF of the film exceeds the length of the cavity.
- high-pressure discharge lamp characterized ge ⁇ indicates that the end face of the film, the end face of the container at least locally touched or at least ⁇ fixed locally in the end face of the container, wherein the end face of the container flattened or dome concave or convex is curved.
- High-pressure discharge lamp according to claim 1 character- ized in that the width of the film is significantly smaller than the inner diameter of the container.
- High-pressure discharge lamp according to claim 1 characterized ge ⁇ indicates that the film is folded so that it has at least one bend or a bend parallel to the longitudinal axis.
- High-pressure discharge lamp according to claim 1 characterized ge ⁇ indicates that the film-like electrode is tapered at its front side.
- the high-pressure discharge lamp according to claim 10 characterized denotes ⁇ ge that the film is in its width by Minim ⁇ least 30% smaller than the inner diameter of the container.
- Fig. 1 shows a high pressure discharge lamp having a starting aid, schematically ⁇ table (Figure la) and the cut-out ( Figure lb);
- Figure 3 is a plan view of selected embodiments of Figure 2;
- FIG. 4 is a plan view of exemplary embodiments with a fitted foil
- FIG. 5 is a plan view of embodiments with a deformed discharge vessel
- FIG. 6 is a side view of embodiments with a deformed discharge vessel
- Figure 8 shows another embodiment of a UV enhancer. Preferred embodiment of the invention
- FIG. 1 a a metal halide lamp 1 is shown schematically (FIG. 1 a), in which a discharge vessel 2 made of PCA is contained in an outer bulb 3 made of quartz glass, which is closed off with a base 4.
- the discharge vessel 2 has two ends, on which capillaries 5 sit.
- the discharge vessel 2 is provided with a metal halide filling, as known per se. It is supported in the outer bulb 3 by means of a frame 6, which has a short frame ⁇ wire 7 and a long bracket wire 8. On a first capillary 5 sits a UV enhancer 10, which is connected to the short frame wire 7 via a feed line 11.
- the counter electrode to it also called external electrode, is a foil strip 9, which extends from the hanger wire 8 to the UV enhancer 10 and this surrounds a semicircle.
- a wire or a sufficient proximity of the ironing ⁇ wire for UV-enhancer 10 for the function of the counter electrode is sufficient. Preference is given to the shortest possible distance and a contact area which is as large as possible and which comprises not only one tip but at least one quarter circle to half circle, as shown in FIG. 1b.
- Figure 2a shows in detail a container or discharge vessel 12 of the UV enhancer 10.
- the container 12 is in principle a can or cup-like tube made of quartz glass with side wall 13, bottom part 14 and dome 15.
- the container can also be shaped differently and he can also be made of tempered glass.
- Essential to the invention is that the container 12 a filling of halogen gas, or halogen gas combined with inert gas, in particular a Penninggemisch or argon having.
- the container 12 has a tubular cavity 17 into which an electrode 18 extends from one side, the bottom part 14. protrudes.
- the electrode is sealed in a bottom part 14 zugeord ⁇ Neten pinch 16.
- the length of the electrode 18 in the container 12 is considerably longer than the length L of the cavity 17. It is preferably at least 20% longer than L.
- the electrode 18 is ge ⁇ Telss 2a bent in the cavity so that it at two gegenü ⁇ Overlying side walls resiliently applied. The electrode thus has a bend near the bend.
- the cavity 17 must be large enough to accommodate the single electrode 18, the UV enhancer operating on the dielectrically impeded discharge principle.
- the electrode 18 is a pin, or preferably a foil , mostly of W or Mo. It has a contact wire 11 attached to the outer end 19, see FIG. 1. The electrode 18 is inserted into the cavity 17. Then, a filling gas is filled into the cavity 17 and the cavity, in particular with a pinch 16, closed.
- FIG. 2 b shows an embodiment in which the electrode has a kink which is seated in the vicinity of the dome 15.
- FIG. 2 c shows an exemplary embodiment in which the electrode 18 is cut in the axis and thereby forms an axial trunk 19 and two branches 20.
- the two branches 20 are bent to two sides.
- this shape can also be generated in other ways, for example, by attaching to a trunk 19 two separate branches or more branches.
- FIG. 2 d shows an exemplary embodiment in which the electrode 18 is cut in the axis and thereby forms an axial stem 19 and two branches 20.
- the two branches 20 are bent to two sides.
- this shape can also be generated in other ways, for example, by attaching to a trunk 19 two separate branches or more branches.
- the container 12 is provided with a thickened, convex dome 25, but this thickening is not absolutely necessary.
- the foil-like electrode 18 rests with its tip 26 on the inner wall of the concave dome 15 (as in FIG. 2 a) or the thickened dome 25.
- the film 18 is slightly longer than the inner length of the container 12. Thus, it is slightly compressed.
- the value LF / L is preferably 1.0 to 1.2
- the inner diameter of the container is the
- This embodiment is produced in that the foil-like electrode 18, the quartz glass is compressed in the direction of crushing 16 during the process of Abschmel ⁇ zen the exhaust tip, thereby forming a dome. Due to a reduced pressure compared with the atmospheric pressure, the doughy glass of the pump tip is drawn into the interior of the UV enhancer during melting.
- the boundary conditions for the bulbous concerns of the Mo film to the cylindrical wall is the smallest possible thickness of the Mo film.
- Mo foils are used with thicknesses ⁇ 20ym, in particular 5 to 20 ym, which then have a low rigidity and can easily bulge through the overlying pump ⁇ tip.
- FIG. 2g Another embodiment is shown in FIG. 2g. At ⁇ the foil-like electrode 18 is kinked several times. It can also be thickened here during the process of melting off
- Dome 25 are compressed, so that several kink ⁇ points 30 result, at which the electrode 18 of the inner wall of the container comes close.
- a concrete embodiment of the filling is a UV enhancer in which krypton is used as the filling gas with a 0.5% by volume.
- Blend of chlorine gas Cl 2 is used.
- the UV enhancer shows strong UV radiation of the excimer line KrCl * at a wavelength of 222 nm.
- the cold filling pressure is in the range 500-700 mbar.
- inventions of Figure 2 are in principle each good for cooperating with external electrodes.
- external electrodes are advantageously used which enclose the UV enhancer in the middle of the cylindrical part of the container 12 and, in particular, have a planar extent.
- a foil tape 32 or a flat-pressed wire is used. See the Dar ⁇ position 2h in FIG.
- a high probability for the formation of a Entla ⁇ dung is obtained where the highest possible electric field strengths at the inner electrode 18 resulting in an area. This can be achieved in that the smallest possible distance between external electrode 32 and internal
- Electrode 18 is. For the highest possible intensity of the UV radiation generated by the UV enhancer, it is advantageous to provide as many places as possible where such a condition is met. Therefore, as many touch ⁇ points of the inner electrode 18 to the side wall 13, and if possible in the amount of the external electrode 32, desirable. This applies in particular to the exemplary embodiment according to FIG. 2 g.
- FIG. 3a shows the exemplary embodiments of FIGS. 2a and 2b in plan view.
- the width B of the film is preferably 40 to 80% of the inner diameter of the container 12.
- Figure 3b shows the embodiments of Figure 2c and 2d in plan view.
- the width B of the film is preferably 40 to 80% of the inner diameter of the container 12.
- the branches 20 are, in particular unbalanced marnit ⁇ th, so that their width Bl and B2 is un- differs from the foil by at least 20%.
- B B1 + B2.
- Electrode 18 depends.
- Figure 4a shows at the top a film 18A prior to insertion into the container to demonstrate its unfolded width C. According Fi gur ⁇ 4A is this film fits into the cylindrical part Patient- 38th The film is bent or kinked one or more times before fitting, so that they are in the container
- FIG. 4 a shows an embodiment with a bend 40
- FIG. 4 b shows an exemplary embodiment of an eo 38 with a plurality of creases 40
- FIG. 4 c shows an embodiment with a gentle bend 41.
- a preferred embodiment has a molded foil upper edge according to FIG. 4d.
- the upper edge 42 facing the dome 25 is sharpened triangularly, which facilitates the insertion of the film-like electrode 38 into the container 12. It is essential only that a region of the electrode facing the dome 25 is tapered. This can spitzung to ⁇ for example, by folding the sheet edge or already during the cutting process of the film take place.
- Figure 5 shows embodiments in which the distance between the electrode 18 and side wall 13 of the container 12 is controlled by molding the container 12. In this case, the distance is reduced by constricting the container, so that can be defined quasi each two broad sides and narrow sides of the container.
- This arrangement has the principal advantage that the sheet-like electrode 18 can be easily threaded into the container 12 by being threaded over the broad side and then rotated.
- the procedure is reversed.
- the container 12 is initially cylindrical, the film is inserted and only after that is the container deformed thereafter. This deformation can be carried out in particular together with the crimping process, in which a heating of the container 12 is necessary anyway.
- the electrode in contact with the side wall 18 or is it at least very na ⁇ hey.
- FIG. 5a shows an embodiment in which the container 12, which was initially cylindrical, is elliptically deformed. In this case, the edge of the electrode 18 bears against the narrow sides 48 and is transverse to the broad sides 49.
- FIG. 5b shows an exemplary embodiment in which the container 12 is pressed in at the level of the foil edge 50 and forms a dent 51.
- FIG. 5 c shows an exemplary embodiment in which the container 12 is flattened laterally and thereby forms the narrow sides 48.
- the possible extensions of the deformation in the longitudinal direction are shown in FIGS. 6a to 6d.
- the dent may be local and punctiform, as shown in Figure 6a, or extended over a greater axial length than constriction 52, see Figure 6b.
- Preferably 35 sits just an external electrode in Hö ⁇ height of the dent 51 or constriction 52.
- Preferably 35 sits just an external electrode in Hö ⁇ height of the dent 51 or constriction 52.
- FIG. 6c shows a further embodiment of a UV
- Enhancers in which a minimum distance in the region of the flattened end face 55 of the container is desired.
- the end face is flattened extra strong in order to be in contact with the film edge 24 ending there (transverse to the axial length of the container) over its entire length.
- the film is here essentially straight without bending.
- the dome 25 is thickened and the drop-like electrode 18 is provided as a foil to the dome 25 into ge ⁇ leads.
- the external electrode 35 is applied to the end face 24 and the convex dome 25, respectively.
- the film is here essentially straight without bending.
- the electrode 18 is designed so that it favors even high field strengths by having portions with sharp edges of the film.
- the film edge can be shaped specifically.
- Kon ⁇ concrete embodiments are shown in Figures 7a to 7d.
- the high field strength can be achieved by a triangular configuration 60 of the film edge according to FIG. 7a, by a rectangular design 61, see FIG. 7b, or by a semicircular design. sections 62, see Figure 7c, or slots 63, see Figure 7d, can be achieved.
- a film made of molybdenum is typically used as an electrode which erniedri ⁇ constricting substances is doped in particular with the electron work function.
- an oxide of yttrium, cerium or lanthanum is suitable for this, specific embodiments are a doping with 0.5 to 0.7 wt .-% Y203, mixed oxides Ce203 / Y203 or even mixtures
- Ce203 / Y203 / La203 can be used.
- the Mo foil can be used to lower the ignition voltage with metallic alloys, which contain in particular at least one element from the group Ru, Ti, Ta, Nb, or with ceramic layers, which are selected in particular from the group nitrides, oxides, silicides. or with other readily ionizable materials, in particular tungsten material with a very high potassium content, etc., beschich ⁇ tet.
- metallic alloys which contain in particular at least one element from the group Ru, Ti, Ta, Nb, or with ceramic layers, which are selected in particular from the group nitrides, oxides, silicides. or with other readily ionizable materials, in particular tungsten material with a very high potassium content, etc., beschich ⁇ tet.
- FIG. 8a Another embodiment of a UV enhancer is shown in FIG.
- the container is made of quartz glass, Hart ⁇ glass or ceramic.
- a wire is spirally or helically guided along the side wall of the cylindrical container 12, see FIG. 8a.
- the wire acts as a passage, without a film must be used for sealing.
- quartz glass in principle, a film for the pinch is required. This can be saved in that preferably the wire electrode 58 at its end 61 which is to compresses it is flattened or is sufficiently flattened.
- the film is thus integrally attached to the wire of the electrode 58, but it can also be applied separately.
- an embodiment of the present invention can lower the ignition voltage to values of typically down to 1 kV.
- halide-containing filling gases in particular noble gases with halogen, prevent blackening over the lifetime. They also increase the proportion of excimer radiation. Specific examples are argon with C12 or Br2 or J2. but it is also pure argon as a filling gas.
- a halide-containing additive such as dibromomethane (DBM) can be used.
- DBM dibromomethane
- a concrete example is argon with an addition of 2000 to 10000 ppm DBM.
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP12743130.2A EP2737519B1 (de) | 2011-07-28 | 2012-07-26 | Hochdruckentladungslampe mit zündhilfe |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2011/063053 WO2013013727A1 (de) | 2011-07-28 | 2011-07-28 | Hochdruckentladungslampe mit zündhilfe |
| EP12743130.2A EP2737519B1 (de) | 2011-07-28 | 2012-07-26 | Hochdruckentladungslampe mit zündhilfe |
| PCT/EP2012/064716 WO2013014243A1 (de) | 2011-07-28 | 2012-07-26 | Hochdruckentladungslampe mit zündhilfe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2737519A1 true EP2737519A1 (de) | 2014-06-04 |
| EP2737519B1 EP2737519B1 (de) | 2015-11-04 |
Family
ID=50625241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP12743130.2A Active EP2737519B1 (de) | 2011-07-28 | 2012-07-26 | Hochdruckentladungslampe mit zündhilfe |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP2737519B1 (de) |
-
2012
- 2012-07-26 EP EP12743130.2A patent/EP2737519B1/de active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2013014243A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2737519B1 (de) | 2015-11-04 |
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