WO2009056163A1

WO2009056163A1 - Electric lamp having a light bulb and method for producing an electric lamp

Info

Publication number: WO2009056163A1
Application number: PCT/EP2007/061592
Authority: WO
Inventors: Matthias Ediger; Josef Bauer
Original assignee: Osram Gesellschaft mit beschränkter Haftung
Priority date: 2007-10-29
Filing date: 2007-10-29
Publication date: 2009-05-07
Also published as: TW201017712A

Abstract

The invention relates to an electric lamp having a light bulb (1) comprising a combustion chamber (4) in which at least one electrode (5, 8) extends, and at least one bulb neck (2, 3; 2') adjacent to the combustion chamber (4), at least one current supply device (6, 7, 9, 10; 6', 7', 9', 10') connected to the electrode (5, 8) being embedded in the bulb neck. The current supply device extends outwards from the bulb neck (2, 3; 2'), wherein an end-side hollow space (11, 14; 11', 14') is formed on an end (21, 31) of the bulb neck (2, 3; 2') facing away from the combustion chamber (4), said hollow space being at least partially filled with glass solder (12). The invention further relates to a method for producing an electric lamp (I, II).

Description

description

Electric lamp with a lamp bulb and method of manufacturing an electric lamp

Technical area

The invention relates to an electric lamp with a lamp bulb, which has a combustion chamber, in which extends at least one electrode, and a piston neck adjoining the combustion chamber, in which at least one power supply device connected to the electrode is embedded, which extends from the bulb neck extends outside. Furthermore, the invention relates to a method for producing an electric lamp.

State of the art

The parallel development of ever more powerful discharge and halogen lamps with constant or even reduced lamp size or reduced cooling in luminaires exposes the components to extreme thermal loads. The usual current-carrying parts consist in these lamps, for example, molybdenum, which begins to oxidize above a temperature of about 350 ⁰ C begins. Since, for example, the system is embedded in the quartz glass of the lamp bulb with a current carrier pin and a current carrier foil, there is no room for expansion for the higher-volume molybdenum oxide. This leads to premature failure of the lamp due to jumps or even a lamp blaze.

From DE 699 27 574 T2 an electric lamp is known in which on the outer conductor and the thus connected current carrier foil a protective coating is formed. The protective coating is formed only as a thin layer of about 4 microns to 6 microns and is for example made of chrome. Due to the between the inner wall of the piston neck on the one hand and parts of the current carrier foil and the outwardly extending current carrier pin on the other hand formed capillary, this protective coating extends necessarily over the entire length of the current supply pin and imperatively also over an exposed portion of the current carrier foil.

The application of the coating is relatively expensive. In addition, this application is also relatively expensive and the application process may also be hazardous to health due to the materials used to produce the coating. Furthermore, the coating must already be applied to the current carrier foil and the current carrier pin before the melting process.

However, since there occurs capillary formation between the inner wall of the piston neck and the outside of the current carrier foil and the current carrier pin and the coating applied thereto only during the melting process, it is relatively difficult and often unpredictable whether sufficient oxide protection is produced by the coating after the melting process could. Since the coating material also melts during this melting, the further defined and desired generation of a sufficient oxide protection can not be predicted. Presentation of the invention

It is an object of the present invention to provide an electric lamp and a method for producing such an electric lamp, in which or in which the oxidation protection of current-carrying parts can be improved in the electric lamp and this can be achieved with less effort.

This object is achieved by an electric lamp having the features of claim 1, and a method having the features of claim 12.

An electric lamp according to the invention comprises a lamp bulb which has a combustion chamber into which at least one electrode extends. Furthermore, the lamp comprises at least one piston neck adjoining the combustion chamber into which at least one power supply device connected to the electrode, which extends outwardly from the piston neck, is embedded. At an end of the piston neck facing away from the combustion chamber, an end-side cavity is formed, which is at least partially filled with glass solder for sealing.

For such a design of the electric lamp, the oxidation protection of extending in the neck of the piston parts of the power supply device can be improved. Furthermore, in comparison to the prior art, an equally effective oxidation protection can be achieved much more simply and cost-effectively. In addition, the use of environmentally harmful substances can be avoided and the introduction of the glass solder requires no additional complex process steps. An electrode is understood to be an anode and a cathode, for example a discharge lamp. Likewise, the term of an electrode is also understood to mean an incandescent filament of an incandescent lamp, in particular a halogen incandescent lamp.

In particular, the power supply device is embedded by a melting and / or squeezing of the material of the piston neck at the corresponding location in the piston neck. It is then particularly preferred that the cavity of the piston neck formed at the end can only be filled with the glass solder after this embedding process. It is therefore no longer necessary, as in the prior art, that a coating must be performed on the power supply device before the melting process and then it must be hoped in the subsequent melting process that the melting coating is distributed to the desired locations. In which in the advantageous embodiment of the invention quasi the squeezing is already completed and the geometric design of the cavity is known and no longer changes, the introduction of the glass solder can be done much more defined and precise.

Preferably, the clearance of the cavity between the inner wall of the piston neck and the outside of the power supply device perpendicular to the longitudinal direction of the power supply device as viewed through the glass solder is completely filled. Large gaps, as occur in the prior art, can therefore be avoided. Undesirable thin spots, which substantially increase the risk of oxygen penetration and even provided in the prior art, can be avoided become. Thus, viewed in particular in the radial direction, the cavity is completely filled with the glass solder.

Preferably, the cavity is formed exclusively on a side facing away from the combustion chamber of the pinch region of the piston neck. Considered in the longitudinal direction of the piston neck and thus also of the power supply device, at least partially filling a cavity region extending in this longitudinal direction with a relatively short length suffices to reduce costs and to reduce costs for improved oxidation protection. In addition, by this specific position of the cavity and the introduction of the glass solder can be done relatively easily and with little effort.

Preferably, the length and thus the inner end of the cavity is limited by the combustion chamber facing away from the end of the crimping.

Preferably, the thickness of the glass solder, and thus in particular the extent in the radial direction, is greater than the radial dimensions of a current supply pin of the current supply device. In particular, the thickness of the glass solder is at least twice as thick as the radius of the power supply pin of the power supply device. The radial extent of the glass solder is thus preferably substantially larger than the radius of the current supply pin of the current supply device. In particular, the power supply device in the region of the current carrier pin is surrounded on the circumferential side by the glass solder.

Preferably, the radial distance between the outside of the current-carrying pin and the inner wall of the piston neck bounding the cavity is substantially greater than a distance. stood between the outside of the current-carrying pin and the inner wall of the piston neck outside the cavity and thus in the region of a trained capillary. In particular, the cavity therefore does not constitute any air space formed during the cooling down of the lamp bulb and the melted components in the bulb neck, but is formed in particular by the hollow end region of the tubular bulb neck. This is especially true in the case of discharge lamps with tubular piston necks. In the case of halogen incandescent lamps, the formation of the cavity during the squeezing process is generated, which occurs as a small depression around the current-carrying pin.

In particular, the glass solder is thus designed like a plug and correspondingly dimensioned due to the shape of the cavity.

The diameter of the cavity and thus also of the plug-like glass solder in the cavity is larger, in particular at least twice as large, than the diameter of the current supply pin of the power supply device at this point. This is especially true in the case of discharge lamps with tubular piston necks. However, corresponding cavities can also be formed in halogen incandescent lamps.

Particularly preferably, the glass solder is introduced into the cavity under a protective gas atmosphere. As protective gas, for example, argon may be provided. By doing so, existing oxygen can be expelled particularly effectively and the occurrence of oxygen during introduction of the glass solder can be prevented. As a result, the oxidation protection can be further improved. In particular, Especially when introducing the glass solder thus the penetration of unwanted oxygen can be prevented.

The power supply device comprises a current carrier foil, which is completely embedded in the bulb neck and connected to the electrode. Furthermore, the power supply device comprises a current-carrying pin, which is connected to the current-carrying foil inside the piston neck and extends outward from the neck of the piston at the hollow of the piston neck. The glass solder is spaced apart as seen in the longitudinal direction of the power supply device to and formed without contact with the connection region between the current carrier foil and the Stromträgerstift. Preferably, therefore, the glass solder is peripherally formed only and exclusively around the current-carrying pin around. The current carrier foil is thus arranged in the bulb neck free from glass solder. Also, the connection area between the current-carrying pin and the current-carrying foil, which is in particular a welding area, is thus formed without contact with the connecting material.

This also makes it possible to achieve a considerably simplified and low-cost attachment of the glass solder, since the defined application of the coating in the prior art is very difficult, in particular due to the different shape of the current carrier pin and the current carrier foil. Especially in this sensitive area, it is no longer necessary in the advantageous embodiment of the invention to provide glass solder.

The softening point of the glass solder is preferably at a temperature greater than 400 ° C, in particular greater than 500 ° C especially greater than 600 ° C, and particularly preferably greater than 1000 ° C.

Preferably, the glass solder is a crystallizing glass solder. It can also be provided that the glass solder is a composite glass solder. It is preferred if the glass solder is formed without lead additive and thus lead-free.

Preferably, the power supply device is at least partially coated with an oxidation protection layer. In particular, it is provided that a power supply pin assigned to the power supply device is at least partially coated with chromium and / or platinum and / or gold and / or aluminum and / or zirconium and / or glass solder as oxidation protection material. Such embodiments can be realized in terms of the production in large quantities, whereby a cost-effective production is possible. The current carrier foil melted in the bulb neck and associated with the current supply device, which is connected to the current carrier pin, can be treated separately in such an embodiment and does not have to be additionally coated with an oxidation protection layer. However, it can also be provided that, in addition to or instead of this, this current carrier foil is at least partially coated with chromium and / or platinum and / or gold and / or aluminum and / or zirconium and / or glass solder as oxidation protection.

The oxidation protection for the molybdenum of the current carrier foil thus extends beyond the seal to the area of the base of the electric lamp. Preferably, such an additional coating of a current carrier foil may be provided in the case of halogen incandescent lamps. Preferably, at least a part of the current carrier foil, which faces the opening of the bulb neck sealed with the glass solder, is coated in this way.

Preferably, a base is arranged on a piston neck at the end, which is formed at least partially from an oxidation protection material. In this regard, therefore, a combination of the oxidation protection can be ensured both at the piston neck and at the power supply components as well as at the final socket. Especially with metal sockets, the use of oxidation-resistant material or a corresponding coating can be particularly advantageous. For example, the use of stainless steel sockets may be provided instead of conventional nickel-plated alloys. Here as well, a coating of chromium and / or platinum and / or gold and / or aluminum and / or zirconium may be provided as the oxidation protection of the base. Due to this configuration of the base, the extension of the oxidation protection can be achieved substantially to the entire lamp.

The electric lamp can be both a single-ended and a double-ended lamp. The introduction of the glass solder can preferably be carried out under a protective gas atmosphere.

Preferably, on the region of the glass solder facing away from the combustion chamber, a layer for protection against oxygen entry to extend into the piston neck Part of the power supply device formed. As a result of this additional layer, a final seal can be made possible, as a result of which the oxidation protection is further improved. Preferably, the material of this additional layer is a material different from the glass solder.

Preferably, this layer is designed to protect against oxygen entry at the combustion chamber of the lamp envelope facing away from the region of the glass solder. Preferably, an external additional protection against oxygen entry is thus formed. This position of attachment of the protective layer is simple and effortless to manufacture while still providing improved protection against oxygen entry.

Preferably, the oxygen entry protection layer and the glass solder are each formed of different materials.

In particular, the layer is formed on the region of the glass solder projecting from the cavity. Due to this configuration, the areal extent of the layer as well as the layer thickness can be easily varied and optimized.

Preferably, the layer for protection against oxygen entry to the power supply device is formed directly on the glass solder. Between this layer and the glass solder then no further material or no further layer is arranged. In principle, however, it can also be provided that no direct attachment of the layer and the glass solder is provided, and intermediate layers are formed in this respect. The layer preferably comprises at least a proportion of polimide for protection against the entry of oxygen. Likewise it can be provided that the layer at least partially comprises a ceramic fiber material. For example, the material Tyranno Coat from UBE Industries can be used here. It can also be provided that the layer is a ceramic adhesive.

Preferably, the layer is formed of a temperature-stable to 500 ° C material.

The lamp bulb preferably has at least two piston necks, which open opposite to the combustion chamber.

In a method according to the invention for producing an electric lamp, in which at least one electrode is at least partially extending into a combustion chamber of a lamp bulb and at least partially introduced extending into a piston neck adjoining the combustion chamber and is partially embedded in the bulb neck with a power supply device , the power supply device extends out of the piston neck to the outside. In the piston neck, an end-side cavity is formed, which is filled at least in regions with a glass solder for sealing to protect against oxidation of extending in the piston neck portion of the power supply device. By this method of manufacturing an electric lamp, improved oxidation protection can be achieved with lower costs and with lower costs. In the manufacture occurs by the method and the chosen substances in comparison negligible environmental impact on the use of chromium.

Preferably, a part of the power supply device extending in the piston neck and the part of the electrode extending into the piston neck are embedded in the piston neck by melting and / or squeezing the material of the piston neck. The glass solder is introduced into the cavity only after the area-wise embedding of the power supply device and the electrode in the piston neck. The introduction of the glass solder in a process step downstream of the embedding process enables the more targeted and defined attachment of the glass solder. This also results in a much improved oxidation protection.

Preferably, the glass solder is inserted so that the free space of the cavity formed between the inner wall of the piston neck and the outside of the power supply device in a direction perpendicular to the longitudinal axis of the power supply device is completely filled with the glass solder.

Preferably, the entire cavity is completely filled with the glass solder. Larger air spaces can be prevented, and the occurrence of oxygen can be at least significantly reduced.

The cavity is preferably formed only on a side facing away from the combustion chamber of the pinch region. As a result, only a relatively small volume for at least partially filling with the glass solder is provided. This facilitates the introduction of the glass solder be and still be introduced with a sufficient amount for improved oxidation protection.

The glass solder is introduced in a particularly preferred manner under a protective gas atmosphere in the cavity.

It is particularly preferred that the penetration of oxygen into the bulb neck at a temperature of 500 ° C for a period of 1000 hours and more can be prevented by the glass solder. In this context, in discharge lamps, a high-temperature contactor can be made possible by the glass solder at the pinch at 500 ° C for at least 1000 hours. In the case of halogen incandescent lamps, a negative entry of oxygen into the bulb neck into the live parts can preferably be prevented in this regard at temperatures of 500 ° C. over an operation of e over 1000 hours. In particular, this can be achieved with a combination in which, in addition to the glass solder in the cavity, the current carrier foil is at least partially coated with an additional oxidation protection layer, in particular with chromium.

By virtue of this special functionality of the glass solder, which preferably results from the material composition and the dimension and mass, the serviceability of the electric lamp can be significantly increased.

Advantageous embodiments of the electric lamp according to the invention are to be regarded as advantageous embodiments of the method according to the invention. Brief description of the drawings

Embodiments of the invention are explained in more detail below with reference to schematic drawings. Show it :

1 shows an electric lamp according to the invention in a side view or in a partial section according to a first embodiment. and

Fig. 2 is a partial view of an electric lamp according to the invention according to another embodiment.

Preferred embodiment of the invention

In the figures, identical or functionally identical elements are provided with the same reference numerals.

In Fig. 1, a designed as a discharge lamp electric lamp I is shown in a schematic representation. The illustration shows the lamp I in the upper area in a sectional view and in the lower area in a side view.

The lamp I is formed in the embodiment as a high-performance lamp with a lamp power of, for example, 1200 W.

The lamp I has a lamp bulb 1, which comprises a bulbous middle part, to which a piston neck 2 and a piston neck 3 adjoin on the opposite sides. The lamp bulb 1 is integrally formed and in the interior of the middle part a discharge space 4 is formed as a combustion chamber. In the discharge space 4 extends a first electrode 5, which is formed rod-shaped in the embodiment. The first electrode 5 is electrically and mechanically connected to a power supply device 6, 7. The electrode 5 is made in the embodiment of tungsten or a tungsten-containing material.

The power supply device comprises a current carrier foil 6 which is formed from molybdenum or a molybdenum-containing material and, moreover, is designed as a sealing foil during gas-tight melting into the bulb neck 2. In addition, the power supply device comprises a current carrier pin 7, which is likewise designed rod-shaped and consists for example of molybdenum or a molybdenum-containing material.

In a corresponding manner, a second electrode 8 is provided on the opposite side, which is likewise designed rod-shaped and extends into the discharge space 4. In addition, the second electrode 8 is also at least partially embedded in the second piston neck 3 and electrically and mechanically connected to a power supply device 9, 10, which is formed analogously to the power supply device 6, 7 in the piston neck 2. By way of example, the current carrier pin 10 and the current carrier foil 9 of this current supply device are shown.

In the exemplary embodiment, the lamp I is designed with two sides. However, it is also possible to provide a discharge lamp with single-cap base. Likewise, an electric lamp I can also be embodied as a halogen incandescent lamp. The current carrier foil 6 and the current carrier pin 7 extending out of the bulb neck 2 are welded at a connection point 13. At a side facing away from the discharge space 4 end 21 of the piston neck 2, a cavity 11 is formed. Since the piston neck 2 is designed in the embodiment in its basic configuration as a tube, the cavity 11 is formed as a substantially circular cross-section cavity 11. The longitudinal axis A of the piston neck 2 essentially corresponds to the longitudinal direction of the power supply line 6, 7 and thus also to the longitudinal axis A of the electrode 5 and of the current carrier pin 7. The current carrier pin 7 is arranged substantially coaxially to the longitudinal axis of the cavity 11, the longitudinal axis of the Cavity 11 of the longitudinal axis A of the joint neck 2 corresponds.

In Fig. 1, the lamp I is shown in a manufacturing state, in which the ends are still to install the base. This means that the power supply device 6, 7 is melted into the piston neck 2 and the material of the piston neck 2 is squeezed in a pinch region 22. As a result, the current carrier foil 6 is arranged gas-tight in the bulb neck 2. The pinch region 22 extends only partially over the entire length of the piston neck 2 and terminates substantially at the bottom and thus the connection point 13 facing the end of the cavity eleventh

The cavity 11 is completely filled with a glass solder 12 in the embodiment. The glass solder 12 is formed for the oxidation protection of the part of the power supply device 6, 7 extending into the piston neck 2. The cavity 11 extends only to a point of the piston neck 2, which is spaced from the connection point 13 is formed. The glass solder 12 is thus formed without contact to the connection point 13 and thus also to the current carrier foil 6. The longitudinal distance is indicated by the reference numeral 1.

In addition, the current carrier pin 7 has a diameter dl which is substantially smaller than the diameter d2 of the cavity 11. The thickness of the glass solder 12, which is given by the distance of the outside of the current carrier pin 7 to the cavity 11 bounding inner wall of the piston neck 2 , is thus larger, in particular substantially larger than the radius ((dl) / 2) of the current carrier pin. 7

As can be seen in FIG. 1, the glass solder 12 surrounds only the current carrier pin 7 on the circumference.

The glass solder 12 is filled into the cavity 11 only after the embedding process and thus after the melting and squeezing of the piston neck 2 in the pinch region 22.

The radial extent of the cavity 11 is thus substantially greater than the capillaries forming during the melting process and the subsequent cooling process between the material of the piston neck 2 and the current carrier foil 6 in the region of the connection point 13 and the current carrier pin 7 in the pinch region 22.

In the region of the bulb neck 3 is not a sectional view, but a side view of the lamp I shown from the outside. The design of the lamp I in the piston neck 3 is analogous to the embodiment in the region of the piston neck 2. By way of example, the cavity 14 is drawn with a radius r to the axis A. Here too, the cavity 14 is formed at an end 31 of the piston neck 3 facing away from the discharge space 4. It also extends only to a pinch area 32nd

The cavity 11 extends in the direction of the longitudinal axis A viewed from the edge of the rear end 21 of the piston neck 2 to a maximum at the beginning of the squish area 22nd

In an analogous manner, the cavity 14 in the bulb neck 3 is dimensioned.

In the manufacture of the lamp I thus the electrode 5 with the power supply 6, 7 is inserted into the tubular piston neck 2. Subsequently, the pinch region 22 is then produced by heating the bulb neck 2 at the corresponding point and melting the quartz glass material. Furthermore, a squeezing operation is then carried out at the corresponding point of the piston neck 2 in order to achieve the gas-tight melting of the current carrier foil 6. In the following, the piston neck 2 is then cooled and capillaries (not shown) can form, in particular, at the connection point 13 and around the current-carrying pin 7 due to the different material expansions.

Only after cooling the glass solder 12 is then introduced into the cavity 11. Correspondingly, the manufacture of the lamp I takes place in the region of the piston neck 3.

The introduction of the glass solder 12 is preferably carried out under a protective gas atmosphere, for example with argon. The oxygen exclusion achieved with the glass solder 12 is sufficient to allow temperatures of at least 500 ^° C. for a period of at least 1000 hours at the power supply device 6, 7. The same applies in the area of the piston neck 3.

In an embodiment of the lamp I as a halogen incandescent lamp, it can preferably be provided that the attachment or introduction of the glass solder 12 into the cavity 11 can take place simultaneously or at least temporarily simultaneously with the production step of attaching a base.

Embodiments which have been explained with reference to the configuration of the lamp I in the region of the piston neck 2 apply analogously to the embodiment and procedure in the piston neck 3 or for a corresponding second piston neck of a lamp I if it has such a second piston neck.

As can be seen in the illustration in FIG. 1, the cavities 11 and 14 are rounded at their end facing the discharge space 4.

Due to the environment and dimensioning of the cavities 11 and 14, the glass solder 12 is also formed as a plug-like closure. As shown in FIG. 1, it can be seen that the glass solder 12 extends beyond the rear edge or edge of the rear end 21.

As indicated in the illustration according to FIG. 1, a further layer 16 is formed on the glass solder 12 for protection against oxygen entry to the current supply device 6, 7. This layer 16 is directly on the Surface 15 of the glass solder 12 is formed, wherein this surface 15 is a combustion chamber 4 facing away from the environment and facing top.

In the exemplary embodiment, the glass solder 12 is introduced into the cavity 11 in such a way that, with a certain curvature, it extends beyond the edge of the rear end 21 to the outside. The layer 16 is also applied to the edge of the rear end 21 in addition to the direct application on this outwardly extending surface 15. The glass solder 12 is thus completely covered by the layer 16 on the exposed surface 15.

The layer 16 is applied in particular to this surface 15 after the complete formation of the glass solder 12 in the cavity 11. The layer 16 can be made of polyimide or a ceramic fiber material or a ceramic adhesive and is in particular thermally stable up to temperatures of 500 ° C. The additional layer 16 can further improve the reduction in oxygen permeability and extend the time to a possible shaft jump. The duration of the high temperature protection at about 500 ° C can be improved by 15% to 20% by this additional layer 16. Applicability is ensured for all covered discharge lamps and halogen incandescent lamps.

In Fig. 2 is a partial sectional view of a designed as a halogen incandescent lamp II is shown in a schematic sectional view. The lamp II has only one piston neck 2 'in which a power supply device 6', 7 ', 9' and 10 'are embedded or embedded. is melted, wherein the current carrier pins 7 'and 10' end of the piston neck 2 'extend to the outside. The current carrier pins 7 'and 10' are welded to the current carrier foils 6 'and 9'. In the piston neck 2 'end cavities 11' and 14 'are formed, which are completely filled in the embodiment shown with the glass solder 12 for sealing and oxidation protection. Additional layers 16, as shown in the embodiment of the lamp I in Fig. 1 are not formed in this embodiment, but may optionally also be provided.

Furthermore, it is provided in the exemplary embodiment according to FIG. 2 that the molybdenum material of the current carrier foils 6 'and 9' is coated with a further oxidation-protection layer at least in regions, in particular at the connection points 13 'and 13' '. In particular, a coating with chrome is provided here.

In the embodiment of the double capped lamp I according to FIG. 1, it can preferably be provided that the piston necks 2 and 3 are each terminated at the ends with a stainless steel base. Such a base forms an additional oxidation-resistant design.

By virtue of this configuration, the electrical conductivity can be maintained essentially unchanged at a temperature of 500 ° C. for at least 800 hours.

Claims

claims

1. Electric lamp with a lamp bulb (1), which has a combustion chamber (4) into which at least one electrode (5, 8) extends, and at least one piston neck (2, 3, 2 'adjoining the combustion chamber (4) in which at least one power supply device (6, 7, 9, 10, 6 ', 7', 9 ', 10') connected to the electrode (5, 8) is embedded, which extends from the piston neck (2, 3 2 ') to the outside, characterized in that at one end remote from the combustion chamber (4) end (21, 31) of the piston neck (2, 3, 2') an end-side cavity (11, 14, 11 ', 14') is formed, which is at least partially filled with glass solder (12).

2. An electric lamp according to claim 1, characterized in that the softening point of the glass solder (12) is greater than 400 ⁰ C, in particular greater than 500 ⁰ C, in particular greater than 1000 ° C, is.

3. Electric lamp according to claim 1 or 2, characterized in that the glass solder (12) is a crystallizing glass solder.

4. Electric lamp according to one of the preceding claims, characterized in that the glass solder (12) is a Kompositglaslot.

5. Electric lamp according to one of the preceding claims, characterized in that the glass solder (12) is lead-free.

6. Electric lamp according to one of the preceding claims, characterized in that the power supply device (6, 7, 9, 10; 6 ', 7', 9 ', 10') is at least partially coated with an oxidation protection layer.

7. Electric lamp according to claim 6, characterized in that one of the current-carrying device (6, 7, 9, 10, 6 ', 7', 9 ', 10') associated Stromträgerstift (7, 10, 7 ', 10'), at least partially coated with chromium and / or platinum and / or gold and / or aluminum and / or zirconium and / or glass solder.

8. Electric lamp according to claim 6 or 7, characterized in that one of the current-carrying device (6, 7, 9, 10, 6 ', 7', 9 ', 10') associated Stromträgerfolie (6, 9, 6 ', 9' ), at least partially coated with chromium and / or platinum and / or gold and / or aluminum and / or zirconium and / or glass solder.

9. Electric lamp according to one of the preceding claims, characterized in that on a piston neck (2, 3, 2 ') end a socket is arranged, which is at least partially formed of an oxidation protection material.

10. Electric lamp according to claim 9, characterized in that the oxidation protection material comprises chromium and / or platinum and / or gold and / or aluminum and / or zirconium.

11. Electric lamp according to one of the preceding claims, characterized in that on the combustion chamber (4) facing away from region (15) of the glass solder (12), a layer (16) for protection against

Oxygen entry to the piston neck extending in the part of the power supply device (6, 7, 9, 10, 6 ', 7', 9 ', 10') is formed.

12. A method for producing an electric lamp (I, II), wherein at least one electrode (5, 8) extending at least partially into a combustion chamber (4) of a lamp bulb (1) and at least partially in a to the combustion chamber (4 ) adjoining the piston neck (2, 3, 2 ') and with a power supply device (6, 7, 9,

10; 6 ', 7', 9 ', 10') is partially embedded in the piston neck (2, 3, 2 ') and extends out of the piston neck (2, 3, 2') to the outside, characterized in that in the piston neck ( 2, 3, 2 ') an end-side cavity

(11, 14, 11 ', 14') is formed, which at least partially filled with a glass solder (12) for sealing to protect against oxidation of the in the piston neck (2, 3, 2 ') extending portion of the Stromzufüh- tion.