DE202010011029U1 - High pressure discharge lamp with ignition aid - Google Patents

Abstract

High-pressure discharge lamp with starting aid, with a discharge vessel made of ceramic, which is sealed on two sides, and which is housed in an outer bulb, wherein the discharge vessel has two ends with capillaries in which electrodes are fixed, wherein a frame with two frame wires supports the discharge vessel in the outer bulb , wherein a UV enhancer is housed as an ignition aid in the outer bulb, characterized in that the UV enhancer has a shape of a capillary directly or indirectly adapted container by a part of the outer wall of the container is adapted to a portion of the outer wall of the capillary, wherein the container, possibly together with the capillary, enclosing a cavity which is filled with a gas which can emit UV radiation.

Description

Technical area

The The invention is based on a high pressure discharge lamp according to the The preamble of claim 1. Such lamps are in particular high-pressure discharge lamps for general lighting.

State of the art

From the WO 2008/044197 a high-pressure discharge lamp with a ceramic discharge vessel is known in which a starting aid emanates from a long frame wire. The ignition aid is a separate piece of wire which extends in the direction of the discharge vessel at the level of a capillary.

Another ignition technology are so-called UV enhancers, see for example US 5,811,933 ; US 5,942,840 ; US 6,806,646 , UV enhancers are already known, they are used in quartz or ceramic high pressure discharge lamps. Normally, the UV enhancer is positioned near the discharge vessel within the outer bulb

Presentation of the invention

The The object of the present invention is a high-pressure discharge lamp to provide, the ignition is reliable.

This applies in particular to metal halide lamps, the Material of the discharge vessel is ceramic.

These Task is solved by the characterizing features of claim 1.

Especially advantageous embodiments can be found in the dependent Claims.

The The object of the present invention is a high-pressure discharge lamp to provide with UV enhancers that are reliable without use can be ignited by Kr85. A form-adapted UV enhancer is attached according to the invention to the capillary and is at the end. Here, the capillary is facing Part of the container the shape of the outer wall of the Capillary adapted, the container is thus unbalanced. It includes a Hohlruam, which is the volume for the UV enhancer forms. The container can be unilateral, ie a capillary, or for symmetrical heat conduction and distribution on both sides in the region of both capillaries at the discharge vessel Ceramics, usually PCA, AlN o. Ä., Be appropriate. This Customized containers can be very easy and reliable Be attached by a strap to the capillary.

Advantageous there is a single electrode in the cavity. This is preferred as a metal foil of Mo or W, which is preferably cylindrically shaped, designed inside the cavity. The second electrode is then virtually a dielekrisch disabled electrode outside. These Foil is made by a metal wire as the contact part with the actual potential-emitting electrode system or a hanger wire connected.

The Volume of the cavity is filled with a suitable gas or Penning mixture (eg Ar, ArXe or ArHg) and, preferably with a glass solder, sealed. The filling pressure of the gas (cold) should be between 1 mbar and 100 mbar.

In front closing the cavity for the UV enhancer, What is best done with a glass solder is, first the actual electrode system of the burner in a conventional Connection technology, z. B. melting a glass solder introduced.

separate UV enhancers require space in the outer bulb of the Lamp, which is especially in smaller high-pressure discharge lamps is critical, so at wattages to, for example, 50 W.

About that In addition, the exact positioning of a separate enhancer is possible close to the capillary problematic. Production-related position deviations can the effect of the enhancer on the ignition behavior affect the lamp.

Adapted form UV enhancers as presented here are characterized by absolute positional fidelity and consistent effect. The UV generation also takes place in the immediate vicinity of the discharge vessel.

Adapted form UV enhancers do not require any elaborate assembly steps in the lamp construction. A possible shading of the light emission is almost completely avoided or at least clear less than with separate UV enhancers. Shaped UV enhancers are also often better for Hot ignition and higher ignition voltages, which are in the range of typically more than 5 kV. The dielectric strength the lamp is not lowered by it.

The Thickening of the capillary through the container of the UV enhancer In addition, it can lower the temperatures in the melting zone lead, which increases the life can.

In principle, the realization of UV enhancers with two electrodes is possible, including the installation of other components, such. B. a capacitor ( US 4,987,344 ) or even more complex controls ( US 4,721,888 ) is possible to limit the current through the UV enhancer. In general, however, UV enhancers have prevailed that have only one electrode and use a dielectrically impeded discharge. These UV enhancers are relatively inexpensive. The counterelectrode is brought from outside to the discharge vessel in the sense of a capacitive coupling.

The object of the present invention is to provide a high pressure discharge lamp with mounted UV enhancer which can be ignited without the use of Kr85. The assembled enhancer is located on the capillary at the end ( 2 and 3 ). The vessel of the enhancer is a cylinder made of ceramic, which is shaped on the outer surface so that it can be adjusted on the capillary of the burner ( 2 ). The enhancer may be single-sided or bilateral for symmetrical heat conduction and distribution.

A metal wire of Mo or W inside the enhancer and acts as an electrode ( 3 ). This electrode is connected to the actual potential-emitting electrode system or hanger wire ( 3 ). The other electrode form is a metal foil of Mo or W, which is located within the cavity and is connected by a metal wire with the actual potential-emitting electrode system or hanger wire ( 3 ).

A metal foil, which is located above the enhancer, is contacted with the opposite pole and acts as a second electrode ( 3 ).

The volume of the cavity is filled with a suitable gas or Penning mixture (eg Ar, ArXe or ArHg) and sealed with a glass solder ( 4 ). The filling pressure should be between 1 mbar and 100 mbar.

The 5 to 10 represent the different design variants of the integrated UV enhancer. In particular, different variants of the introduction of the counter potential are listed.

separate UV enhancers require space in the outer bulb of the Lamp, which is especially in smaller high-pressure discharge lamps is critical.

About that In addition, the exact positioning of the enhancer is possible close to the capillary problematic. Production-related position deviations can affect the effect of the enhancer on the lamp.

integrated UV enhancers are characterized by positional stability and consistent Effect. The UV generation takes place in the immediate vicinity of the discharge vessel.

she do not need additional mounting steps in the Lamp construction. A possible shading of the light emission is lower. Integrated UV enhancers may be more suitable for hot ignition and higher Ignition voltages> 5 kV. The dielectric strength of the lamp is not lowered.

The Thickening of the capillary can also cause a sinking the temperatures in the meltdown lead, causing the lifetime can be increased.

• 1. Hochdruckentladungslampe mit Zündhilfe, mit einem Entladungsgefäß aus Keramik, das zweiseitig verschlossen ist, und das in einem Außenkolben untergebracht ist, wobei das Entladungsgefäß zwei Enden mit Kapillaren aufweist, in denen Elektroden befestigt sind, wobei ein Gestell mit zwei Gestelldrähten das Entladungsgefäß in dem Außenkolben haltert, wobei ein UV-Enhancer als Zündhilfe im Außenkolben untergebracht ist, dadurch gekennzeichnet, dass der UV-Enhancer einen der Form einer Kapillare direkt oder indirekt angepassten Behälter aufweist, indem ein Teil der Außenwand des Behälters einem Abschnitt der Außenwand der Kapillare angepasst ist, wobei der Behälter, ggf. zusammen mit der Kapillare, einen Hohlraum umschließt, der mit einem Gas gefüllt ist, das UV-Strahlung abstrahlen kann.
• 2. Hochdruckentladungslampe nach Anspruch 1, dadurch gekennzeichnet, dass der UV-Enhancer eine einzige Elektrode aufweist.
• 3. Hochdruckentladungslampe nach Anspruch 1, dadurch gekennzeichnet, dass der Behälter tassenartig mit Boden und Seitenwand geformt ist aus UV-transparenter Keramik, wobei ein Teil der Seitenwand der Form der Kapillare angepasst ist, und wobei die Öffnung mit einem Deckel verschlossen ist.
• 4. Hochdruckentladungslampe nach Anspruch 3, dadurch gekennzeichnet, dass der Behälter im Querschnitt sichelartig geformt ist, mit Innenwand und Außenwand mit unterschiedlichem Krümmungsradius und mit spitz zulaufendem Rand an den beiden Enden der Sichel, wobei die Innenwand an der Kapillare anliegt.
• 5. Hochdruckentladungslampe nach Anspruch 1, dadurch gekennzeichnet, dass der Behälter im Querschnitt sichelartig geformt ist, mit spitz zulaufendem Rand an den beiden Enden der Sichel, wobei diese beiden Ränder an der Kapillare anliegen, und wobei ein Teil der Kapillare die restliche Seitenwand bildet.
• 6. Hochdruckentladungslampe nach Anspruch 1, dadurch gekennzeichnet, dass die einzige Elektrode durch einen Stift im Hohlraum realisiert ist.
• 7. Hochdruckentladungslampe nach Anspruch 1, dadurch gekennzeichnet, dass an das Bodenteil ein Verlängerungsteil der Seitenwand angesetzt ist, das als Lichtleiter für die UV-Strahlung, die durch das Bo denteil in Richtung Entladungsgefäß emittiert wird, wirkt.
• 8. Hochdruckentladungslampe nach Anspruch 7, dadurch gekennzeichnet, dass das Verlängerungsteil wie eine Stuhllehne geformt ist.
• 9. Hochdruckentladungslampe nach Anspruch 1, dadurch gekennzeichnet, dass das Bodenteil in Richtung Entladungsgefäß zeigt.
• 10. Hochdruckentladungslampe nach Anspruch 1, dadurch gekennzeichnet, dass der zweite Gestelldraht ein Bügeldraht ist, wobei der Behälter mittels eines Gurtes, der den Behälter und den Bügeldraht umschlingt, fixiert ist.
• 11. Hochdruckentladungslampe nach Anspruch 9, dadurch gekennzeichnet, dass die Elektrode für den UV-Enhancer aus einer Metallfolie gebildet ist.
• 12. Hochdruckentladungslampe nach Anspruch 11, dadurch gekennzeichnet, dass die Folie einen gezackten Rand aufweist.
• 13. Hochdruckentladungslampe nach Anspruch 10, dadurch gekennzeichnet, dass die Folie eine durchbrochene Oberfläche nach Art einer Käsereibe aufweist.
• 14. Hochdruckentladungslampe nach Anspruch 1, dadurch gekennzeichnet, dass das Entladungsgefäß eine Metallhalogenid-haltige Füllung aufweist.

Essential features of the invention in the form of a numbered list are:

• A high-pressure discharge lamp with a starting aid, comprising a ceramic discharge vessel which is sealed on two sides and which is accommodated in an outer bulb, wherein the discharge vessel has two ends with capillaries in which electrodes are mounted, a frame with two frame wires carrying the discharge vessel in the Outer piston supports, wherein a UV enhancer is housed as an ignition aid in the outer bulb, characterized in that the UV enhancer has a shape of a capillary directly or indirectly adapted container by a part of the outer wall of the container is adapted to a portion of the outer wall of the capillary , wherein the container, possibly together with the capillary, encloses a cavity which is filled with a gas which can emit UV radiation.
• 2. High-pressure discharge lamp according to claim 1, characterized in that the UV enhancer has a single electrode.
• 3. High-pressure discharge lamp according to claim 1, characterized in that the container is cup-shaped with bottom and side wall made of UV-transparent ceramic, wherein a part of the side wall is adapted to the shape of the capillary, and wherein the opening is closed with a lid.
• 4. High-pressure discharge lamp according to claim 3, characterized in that the container is shaped like a sickle in cross section, with inner wall and outer wall with different radius of curvature and tapered edge at the two ends of the sickle, wherein the inner wall abuts the capillary.
• 5. High-pressure discharge lamp according to claim 1, characterized in that the container is shaped like a sickle in cross-section, with a tapered edge at the two ends of the sickle, wherein these two edges abut the capillary, and wherein a part of the capillary forms the remaining side wall.
• 6. High-pressure discharge lamp according to claim 1, characterized in that the single electrode is realized by a pin in the cavity.
• 7. High-pressure discharge lamp according to claim 1, characterized in that an extension part of the side wall is attached to the bottom part, which acts as a light guide for the UV radiation, which is emitted by the Bo denteil in the direction of the discharge vessel.
• 8. High-pressure discharge lamp according to claim 7, characterized in that the extension part is shaped like a chair back.
• 9. High-pressure discharge lamp according to claim 1, characterized in that the bottom part points in the direction of the discharge vessel.
• 10. High-pressure discharge lamp according to claim 1, characterized in that the second frame wire is a stirrup wire, wherein the container by means of a belt which wraps around the container and the stirrup wire is fixed.
• 11. High-pressure discharge lamp according to claim 9, characterized in that the electrode for the UV enhancer is formed from a metal foil.
• 12. High-pressure discharge lamp according to claim 11, characterized in that the film has a serrated edge.
• 13. High-pressure discharge lamp according to claim 10, characterized in that the film has a perforated surface in the manner of a cheese grater.
• 14. High-pressure discharge lamp according to claim 1, characterized in that the discharge vessel has a metal halide-containing filling.

Brief description of the drawings

in the The invention is based on several embodiments be explained in more detail. The figures show:

1 a high-pressure discharge lamp with ignition aid, schematically;

2 a detail at the first end of the discharge vessel, during manufacture;

3 a detail at the first end of the discharge vessel, during manufacture in a later step;

4 an embodiment of a shape-adapted UV enhancer in detail;

5 to 9 further embodiments of a shape adapted UV enhancer in detail;

10 Embodiments of a film electrode for the UV enhancer.

Preferred embodiment the invention

In 1 is a metal halide lamp 1 schematically shown in which a discharge vessel 2 from PCA in an outer bulb 3 is made of quartz glass, with a base 4 is completed. The discharge vessel 2 has two ends, at the capillaries 5 to sit.

The discharge vessel 2 is provided with a Metallhalogenidfüllung, as is known. It is in the outer bulb 3 by means of a frame 6 held, that a short frame wire 7 and a long hanger wire 8th having.

On a first capillary 5 sits a UV enhancer 10 , the one with the short fussing wire 7 via a supply line 11 connected is.

2 shows in detail a shape-adapted container 12 of the UV enhancer 10 , The container 12 is in principle a can or cup-like ceramic tube with side wall 13 , Bottom part 14 and lid 15 , In this case, a part of the side wall 13 the container a groove-like dent 16 on. This is shaped so that, viewed from the radius of curvature, it fits exactly to the outer wall of the capillary 5 is adjusted. The container 12 has a tubular cavity 17 on, in the one side, the lid area 15 the can, an electrode 18 protrudes. The electrode is in the lid 15 sealed, for example by means of glass solder. The cavity 17 is filled with a suitable gas, in particular a Penning mixture. The other side of the can, the bottom area 14 the can, is transparent closed or made of transparent ceramic. The in the UV enhancer 10 UV radiation generated during ignition can leave the container through the bottom or a transparent window in the bottom and so into the discharge vessel 2 reach. This is the floor 14 aligned so that it points towards the discharge vessel.

The container 10 In particular, it covers about 50 to 75% of the length of the capillary 5 He is often near the outer end 19 the capillary 5 appropriate.

The cavity 17 In any case, it must be big enough to be the only electrode 18 which operates on the principle of dielectrically impeded discharge.

The electrode 18 is preferably a pen or a foil, usually from W or Mo. It has on the ex he end 19 a contact wire 11 stated. The electrode 18 gets into the cavity 17 introduced. Then a filling gas enters the cavity 17 filled and the cavity, especially with glass solder, closed.

The UV enhancer 10 is according to 3 on the capillary 5 put on and then with a metallic strap 20 fixed so that the container 12 almost piggyback on the capillary 5 sitting.

When Filling gas are generally known fillings for UV enhancers like noble gases.

The advantage of the contoured container 12 is that the capillary 5 and filled the entire discharge vessel in a conventional manner and can be equipped with electrodes and feedthroughs and that also the container can be filled separately, equipped with electrode and sealed. At the same time, however, only a minimal assembly effort is necessary because the container conforms to the capillary and only with the belt 20 must be fixed.

According to 4a Upon ignition of the lamp UV radiation from the UV enhancer 10 over the bottom part 14 , which is transparent (if the container is cup-shaped) or at least has a transparent window, out of the container and impinges on the discharge vessel 2 , 4b shows a cross section of this arrangement.

5 shows embodiment in which the container 10 at the bottom part 14 with an extension part 21 is provided as a light guide. This has the purpose of bringing the UV radiation as close as possible to the volume of the discharge vessel. In this way the divergence of the radiation with respect to a bottom part without a light guide is avoided. This elegantly takes into account the fact that the container should preferably be attached to the end of the capillary remote from the discharge vessel. This is expedient because the closure of the container of glass solder o. Ä. Is selected, which would not match the heat load close to the discharge vessel.

The light guide is simply a partial wall of the side wall of the container which is elongated like the back of a chair. The UV radiation is then practically between capillary 5 and this backrest part 21 guided, or the UV radiation is in the light guide 21 guided, and thereby towards the volume of the discharge vessel 2 directed.

To ensure a reliable ignition of the UV enhancer in capacitive coupling, a section 30 of the hanger wire 8th at the level of the contoured UV enhancer towards the container 10 be bent down. The capacitive coupling takes place via the container 10 , Here is the container 10 preferably mounted on the opposite side of the capillary with respect to the long frame wire, since then the belt 20 has the longest contact distance for a dielectrically impeded discharge as a second electrode and thus the output of UV radiation is greatest.

6 shows the UV enhancer 10 with light guide 21 in detail.

7 shows a further embodiment in which the UV enhancer 10 . 25 doubled at the same capillary 5 sitting. A first 10 sits opposite the hanger wire, a second 25 is to the hanger wire 8th aligned.

8th shows a further embodiment in which the construction is similar to that in FIG 7 is. However, here is a single UV enhancer 30 used, which is tubular over the capillary, and also a circumferential light guide 31 in the form of a collar. Although this variant is somewhat difficult to assemble, it has the advantage that UV stripping can not escape from the light guide at any point.

The embodiment of 9 is similar to the embodiment of 3 , but with a fundamental difference: the container is only a partial wall 35 , The remaining partial wall 36 is from a part of the outer wall of the capillary 5 educated. The formation of a cavity 37 This ensures that the partial wall 35 of the container is constructed like a crescent moon, the radius of curvature of which is significantly smaller than the radius of the capillary 5 is. As a result, a sickle-shaped cavity is also formed between the sickle and capillary 37 formed when the outer edges 38 of the tank tapering from an inner wall 39 and an outer wall 40 of the container (inside and outside is meant with respect to the direction towards the capillary), abut the outer wall of the capillary. The attachment of the outer edges and closing the lid side and bottom side by means of glass solder. The bottom part may also be a bottom of a cup-shaped container.

10 shows a further embodiment of a UV enhancer 10 , The container 45 is constructed like a crescent moon, with an inner wall 46 and an outer wall 47 between which there is a crescent-shaped cavity 48 extends. The inner wall 46 is directly from its radius of curvature the radius of the outer wall of the capillary 5 customized. In the cavity 48 becomes a foil electrode 49 introduced.

11 shows an embodiment of a foil electrode 49 which is inserted into the cavity. She has a stalk 50 on which a rectangular area as a head 51 the electrode is seated. The surface is curved so that it optimally in the crescent-shaped cavity of the embodiment of 9 or 10 fits. The stalk comes with the contact wire 11 connected, see 11c ,

For the production of a larger piece of metal foil is cut suitable, so that an approximately rectangular neck part 50 as a stalk on the actual film body, the head 51 , attaches. This stem stands during installation in the hollow volume 12 the container out to the rear. It is angled and then with the short frame wire directly or via a supply line 11 connected.

11 shows further embodiments of a specially designed foil electrode which can be used as a single electrode of the UV enhancer. The foil electrode 49 according to 11a can have sharp edges in their surface 56 on holes 55 especially as a regular structure such as a cheese grater. Such edges enhance the electric field in the UV enhancer.

The foil electrode 49 according to 11b has one or more edges 57 sharp edges 58 ,

11c shows a similarly shaped foil electrode 49 , which is an integrally attached neck piece 50 has.

11d , and 11e shows a similarly shaped foil electrode 49 , which is a separately attached neck piece 64 owns as a contact wire. The electrode according to 11f is just a pen 65 ,

The Capacitive coupling can be achieved in particular by means of discrete components like a capacitor can be amplified.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - WO 2008/044197 [0002]
• US 5811933 [0003]
• US 5942840 [0003]
• - US 6806646 [0003]
• US 4987344 [0017]
• US 4721888 [0017]

Claims (14)

High-pressure discharge lamp with starting aid, with a discharge vessel made of ceramic, which is sealed on two sides, and which is housed in an outer bulb, wherein the discharge vessel has two ends with capillaries in which electrodes are fixed, wherein a frame with two frame wires supports the discharge vessel in the outer bulb , wherein a UV enhancer is housed as an ignition aid in the outer bulb, characterized in that the UV enhancer has a shape of a capillary directly or indirectly adapted container by a part of the outer wall of the container is adapted to a portion of the outer wall of the capillary, wherein the container, possibly together with the capillary, enclosing a cavity which is filled with a gas which can emit UV radiation. High-pressure discharge lamp according to claim 1, characterized characterized in that the UV enhancer has a single electrode. High-pressure discharge lamp according to claim 1, characterized characterized in that the container is cup-shaped with soil and sidewall shaped is made of UV-transparent ceramic, with a Part of the sidewall is adapted to the shape of the capillary, and wherein the opening is closed with a lid. High-pressure discharge lamp according to claim 3, characterized in that the container is sickle-shaped in cross-section is shaped, with inner wall and outer wall with different Radius of curvature and with a tapering edge on the two Ends of the sickle with the inner wall abutting the capillary. High-pressure discharge lamp according to claim 1, characterized in that the container is sickle-shaped in cross-section is shaped, with a tapering edge at the two ends of the Sickle, these two edges abutting the capillary, and wherein a portion of the capillary forms the remainder of the sidewall. High-pressure discharge lamp according to claim 1, characterized characterized in that the single electrode by a pin in the Cavity is realized. High-pressure discharge lamp according to claim 1, characterized in that an extension part is attached to the bottom part the side wall is attached, which serves as a light guide for the UV radiation that emits through the bottom part in the direction of the discharge vessel becomes, acts. High-pressure discharge lamp according to claim 7, characterized characterized in that the extension part like a chair back is shaped. High-pressure discharge lamp according to claim 1, characterized in that the bottom part points in the direction of the discharge vessel. High-pressure discharge lamp according to claim 1, characterized characterized in that the second frame wire is a hanger wire is, wherein the container by means of a Gur tes, the container and wraps around the hanger wire, is fixed. High-pressure discharge lamp according to claim 9, characterized characterized in that the electrode for the UVEnhancer off a metal foil is formed. High-pressure discharge lamp according to claim 11, characterized characterized in that the film has a serrated edge. High-pressure discharge lamp according to claim 10, characterized characterized in that the film has a perforated surface has the nature of a cheese grater. High-pressure discharge lamp according to claim 1, characterized in that the discharge vessel is a Has metal halide-containing filling.