WO2009062549A1

WO2009062549A1 - Film for lamps and associated power supply system

Info

Publication number: WO2009062549A1
Application number: PCT/EP2007/062352
Authority: WO
Inventors: Richard Lang; Georg Rosenbauer; Roland Stark
Original assignee: Osram Gesellschaft mit beschränkter Haftung
Priority date: 2007-11-14
Filing date: 2007-11-14
Publication date: 2009-05-22
Also published as: JP2011503811A; DE112007003666A5

Abstract

The invention relates to a film (6) for lamps, to an associated power supply system, to an electric lamp comprising a film of said type and to method for the production thereof. Said film comprises a hinged clip (8,9) provided with a base and at least one intersection line, along which the clip can open. As a result, it is possible to maintain, by clamping, a power supply for the lamp in the clip.

Description

FOIL FOR LAMPS AND ASSOCIATED POWER SUPPLY SYSTEM

Technical area

The invention is based on a film for lamps which use a film seal. This can be a melting or crushing. The lamps may be in particular halogen incandescent lamps or high-pressure discharge lamps.

State of the art

Normally, foils with the associated power supply leads, which lead into the interior or exterior of a bulb of a lamp, only welded. However, there are also relationships Effort ^¬ to use alternatives or welding to-be additionally stabilized.

From US 2 187 860 a lamp is known in which the film is rolled up similar to the lid of a fish bowl. To gain access to the power supply, a hole in the roller is attached. The power supply is additionally angled to mechanically support it in the roll.

In EP-A 944 112, the film is trimmed and umgeschla ^¬ gene. Again, the power supply is additionally bent to mechanically support them in the role. A similar solution can be found in WO 2006/066534. What is common to all such solutions is that parts of the film are lifted out of the original plane and thus produce effec- tiv effect a thickening of the film and an additional consumption of film material. In addition, all previously known Folienfaltverfahren have the disadvantage that the key for the resistance of quartz glass lamps cantonal tenwinkel of molybdenum foil damage at least equal to the Fal ^¬ tung. In addition, the power supply must be bent in part extra. Both are time consuming and costly and not very machine friendly.

Presentation of the invention

An object of the present invention is to provide an improved concept for a film that is ma ^¬ machine-friendly and allows easy connection of the power supply. A further object is to provide a power supply system as well as a lamp, both of which are each easy and inexpensive to produce. Another task is to specify a manufacturing method for each.

This first object is solved by the characterizing features of claim 1. The further objects are achieved by the characterizing features of claims 7, 10, 12 and 13.

Particularly advantageous embodiments can be found in the dependent claims.

According to the invention, the film is provided with at least one tab which can be folded out of the plane of the film. The power supply can be placed on the residual body of the film and the tab then zurückge ^¬ works. Slippage of the power supply in the plane of the film surface is prevented by the tab. Slippage of the power supply in the longitudinal direction is prevented in a preferred embodiment with the use of double coiled lamps that the power supply is Primärgewickel, preferably with a diameter of about 50 to 300 microns, while the kerf on the film in about the same order of magnitude , so preferably here is about 10 to 250 microns wide. Under these circumstances, a primary wrap can practically snag itself in the cut section of the film.

In a particularly preferred embodiment, the tab is folded around the power supply with a portion of its surface. In most cases, the folded part is 40 to 60% of the total surface of the flap. Despite the resulting Nachtiels a doubled film thickness by turning over the flap part, often referred to as Umklappteil in the following, but here are the advantages here. Because the tightness and the glass tensions are not so badly affected that this would beat the serious advantage of thereby erzeilten avoided damaging the Folienkatne to book.

Moreover, additional consumption of film material is not required, in contrast to all other known techniques.

Preferably, a tab, as soon as the power supply is inserted, which in this case can also be a simple wire in particular, when closing, for example by means of a mechanical punch, additionally beauhschlagt with an electric current. This serves -A-

to ensure that the tab does not rupture or be injured because the current handling is designed so that the resulting temperature increase will hold the material of the tab above the brittle-ductile limit temperature of tungsten, particularly cubic-room-dispersed tungsten material. By hot pressing the tab thus the breaking sensitivity of the primary winding is minimized. In particular, the current flow can be increased so far that a welded connection between the power supply and the film is formed. This is ultimately a particularly secure connection, since in addition to the purely Mechnsichen fixation and a weld is created.

In principle, as small a build-up thickness of the system as in a weld is achieved. This is very important because it avoids glass stresses in the quartz glass of the piston to the same extent as in a weld. This minimizes the risk of leaks. In addition, unusual spiral geometries can be mounted and joined without any problems. Furthermore, no expensive additives such as ruthenium or platinum are needed as welding aids. Damage to the foil edge during welding is not to be feared - in contrast to previously known foil folding methods. Thus, for the first time is a safe Verbin ^¬ applications technology available, without compromising elsewhere have to be made. In particular, it is possible to dispense with additives, with bending of the power supply lines, with large tolerance windows for taking into account a sparking geometry of the power supply become. Damage to the foil edge is also reliably avoided.

Basically, the new concept is suitable for a purely mechanical connection between power supply and foil, so that can be dispensed with a weld. However, it is not excluded to improve the compound additionally by welding. Above all, resistance welding is suitable. Because while the welding electrodes, the power supply, usually made of tungsten, do not touch, so that no sticking of the power supply to the welding electrode can happen. In addition, there are defined contact resistances at the cutting edge of the tab. In addition, defined current densities occur at the slightly oxidized geometrically defined cutting edges. Advantageously, even cooling by means of cold welding electrodes with a large cooling cross section avoids cooling of the power supply.

It is not excluded that a part of the tab is folded around the power supply. Here, the advantage of the undamaged film edge remains intact despite the me ^¬ chanical folding.

The concept is particularly suitable for the connection of the film to the internal power supply, since their diameters are normally relatively small, so that the power supply is sufficiently flexible to be clamped by the tab. Of course, the concept can also be used alone or in addition to the connection of the film to the outer Stroz, if the diameter can be chosen sufficiently thin. The film material itself is the usual one used in the construction of lamps, for example molybdenum or doped or coated molybdenum or even tantalum etc. The thickness and shape of the film can also be chosen conventionally. Typically, there are a few tens of μm and a lancet shape of the film.

Such films themselves are typically cut substantially rectangular, with a longitudinal side, which is preferably parallel to the later lamp axis, and a shorter transverse side, which is preferably transverse to the later lamp axis. Deviations from this rule are of course possible and do not affect the basic concept of the invention.

According to the invention, at least one tab is recessed in the film. This can be achieved by punching or by using high-energy radiation, in particular a laser. Typical cutting times per foil are ^less than one second. The cutting pact has a typical width of 5 to 250 μm. The basic shape of the tab is usually rectangular, but it can have any other shapes, such as triangular or rounded. We ^¬ thing is that the tab has a base on which it is connected to the residual body of the film. the cut line for the flap can be round or angular. In the case of a triangle, there are two cutting lines that are tapered. In the case of the preferred embodiment as a rectangle, preferably a rectangle, there are three cutting lines, two of which intersect each other.

The dimension of the tab should be approximately such that the cutting line running parallel or obliquely to the transverse side, or their projection in the case of an oblique arrangement, a maximum of about 80% of the length of the transverse side. The minimum length should be at least 10% of the length of the lateral side. The tab can either be punched out only by the cutting line. But it can also make up a smaller area, in particular for larger diameters of the power supply, so that a recess remains when the tab is zurückge ^¬ zurückklappt. This means that a small part of the ent ^¬ standenen flap is additionally cut off so that the power supply can be more easily fitted. This can be a small, rather hole-shaped recess or a whole strip. This measure improves au ^¬ ßerdem addition, the seal because it can penetrate through the recess with an appropriate choice of the dimension of the recess glass.

Possibly. For example, a plurality of such tabs or additional tab parts can be mounted on a film. As a result, either a plurality of power supply lines can be mechanically held at the same time, or the holder of a power supply can be improved by this additional lug or the lug part.

The cutting of the tab along the cutting edge, for example, by mechanical punching or by high-energy means such as plasma or laser radiation. The concrete way of cutting it is not important.

This system is well suited for metal halide or halogen incandescent lamps, but also versatile for other purposes. Brief description of the drawings

In the following, the invention will be explained in more detail with reference to several embodiments. In the figures ^¬ gen:

FIG. 1 shows a halogen incandescent lamp with a novel foil; Figure 2 shows a power supply system with a film with

tab;

Figure 3 shows an alternative embodiment of the film;

FIG. 4 shows a further alternative of the film;

Figure 5 is a slide with fully folded flap; Figure 6 is a schematic representation of a welding process.

Preferred embodiment of the invention

An embodiment of a halogen incandescent lamp 1 is shown in FIG. 1. It has a bulb 2 made of quartz glass, which is sealed with a pinch seal 3. in the interior of the piston, a luminous body 4 is mounted, which is connected via two inner power supply lines 5, each with a film 6 in the pinch seal 3. The power supply lines are typically made of tungsten or molybdenum, and have a diameter of 15 to 200 μm, depending on the wattage of the lamp. The flask contains a common halogen-containing filling. The type of filling is not important here. Instead of a luminous ^¬ body, the piston may also contain two electrodes.

The foil is made of molybdenum. It has, in the region of the half facing the interior of the piston, a tab 10 which is cut out in a rectangular manner and clamps the inner power supply in the pinch.

This has two transverse cutting edges 11 and a running parallel to the axis of the lamp short cut edge 12. The tab also has a bending edge to be understood base 13, on which the tab 10 is connected to the residual body 14 of the film.

FIG. 2 shows a foil 6 with two tabs. The top, to be directed towards the interior of the piston strap is here triangular, the lower of the outer lead is to face plate 9 is here rounded, and also be ^¬ saves, shown as reference numeral 19th

FIG. 3 shows a foil in which an additional plate part 31 supports the tab 10 inwards. It is attached to the transverse side 32 of the film and consists only of a transverse to the later lamp axis cutting edge 33 and a relatively short to the later lamp axis longitudinal cutting edge 34. The dimension of the tab is exemplified so that the transverse cutting edge 40 to 50% of the transverse dimension the film, according to the length of the transverse side 32 of the film, makes up. The longitudinal cutting edge is completely uncritical in its dimensioning. Here, for example, it is selected to be 5 to 10% of the longitudinal dimension, corresponding to the length of the longitudinal side 35 of the film.

Figure 4 shows an embodiment of a ^{high-pressure} discharge lamp 20 nidfüllung with a per se known Metallhaloge-. In this case, the novel film 21 is used for a seal based on a melting, wherein the discharge vessel 21 made of quartz glass with two cylindri ^¬ 's necks 22, which contain the films 21, is provided. The inner power supply lines are here shafts 25 which terminate at electrodes 26. Preferably, the tab is designed so that the tab is designed substantially rectangular, with a short cutting edge parallel to the base and two edges cut across the base. The tabs may instead of in the middle also directly on the edge of the film similar to the shown additional tab ^¬ part be attached.

The orientation of the tab in the film and the shape of the film are not essential. For example, a per se rectangular tab can also be introduced obliquely into a rechtkcige film.

The production of the flap is most easily achieved by means of high-energy radiation such as an ND: YAG laser or CO2 laser with extremely narrow focus beam diameter of less than 0.5 mm. Preferably, this laser is operated in Pulsbbetreib and the laser beam is guided by means of a micromirror.

Figure 5 shows another embodiment of a power supply system of film 30 and power supply 31. In this case, an originally rectangular tab 32 is initially unfolded in the film over the entire width of its cutting edge, so that the power supply 31, which is designed here as a primary winding between residual body 33 and Tab 32 can be inserted. For better locking of the power supply 31 serve two dreeickige recesses 34 which are arranged gegenübleigend each other at the two broad sides of the tab 32. The tip 35 of the recesses 34 each face away from the tab 32. Subsequently, the tab is folded back to the inserted power supply and then additionally the free outer half 36 of the tab by 180 ° angled so that both halves of the tab completely cover the power supply together. In this way, a particularly secure mounting of the power supply is achieved. FIG. 6 shows a manufacturing method in which the purely mechanical mounting of the current supply by means of a tab is improved by additional adhesion by means of heat treatment, for example by hot pressing or resistance welding. The Mo film 40 is placed between two "welding electrodes" 41,45. The tab 42 in the film clamps the power supply 43. The lower electrode 41 is applied to the residual body 44 of the film, the upper electrode 45 rests only on the tab 42. The "welding electrodes" 41,45 so both do not touch the power supply 43 made of tungsten. Therefore, no sticking is possible here. In addition, defined contact resistances result at the cut edges of the tab 42. In addition, defined current densities result at the slightly anoxidised cut edges. As a further advantage shows that the power supply 43 is not undesirably cooled by the cold "welding electrodes" in this way, as in conventional simple welding techniques. This makes it possible to find a significantly larger choice of parameters for the improved adhesion up to a welding process, wherein the melting of the molybdenum reliably succeeds and at the same time a melting of the tungsten is specifically avoided.

Claims

claims

A film for the construction of lamps with a substantially rectangular shape, characterized in that the film has a hinged tab which is cut out of the body of the film, wherein the tab has at least one cutting edge and ei ^¬ ne base has, along the Latch can be folded out.

2. A film according to claim 1, characterized in that the tab is designed substantially rectangular, with a short cutting edge parallel to the base and two cut edges transverse to the base.

3. A film according to claim 1, characterized in that the tab is designed substantially triangular, with a base and two cutting lines which taper towards each other zueinan-.

4. A film according to claim 1, characterized in that the tab is rounded with a base and a cutting edge which connects the two corners of Ba ^¬ sis together.

5. A film according to claim 1, characterized in that the film has a recess in the immediate vicinity of the cutting edge.

6. A film according to claim 1, characterized in that a further tab or at least one tab portion with at least one cutting edge on the film is seen ^¬ before.

7. power supply system for a lamp consisting of film and at least one associated Stromzu ^{¬ management} , wherein a film with tab according to one of the preceding claims 1 to 6 mechanically connected to the Stromzufüh- that by unfolding the tab away from the rest of the body the foil and folding back the tab (s) to the residual body of the film, the power supply between the tab and the rest of the body is clamped.

8. power supply system according to claim 7, characterized in that a part of the tab is additionally bent around the power supply at the free end of the tab.

9. power supply system according to claim 7, character- ized in that the purely mechanical support is improved by an additional adhesion by means of heat treatment ^¬ .

10. Electric lamp, with a filling ^¬ holding piston of glass and at least one seal and a light bulb mounted in the bulb, wherein the lamp is connected via an internal power supply with a film in the seal and the film with an external power supply is connected, characterized in that the film has a tab according to one of claims 1 to 7 and at least one of the Stromzufüh ^¬ ments in the tab is at least clamped supported.

11. An electric lamp according to claim 10, character- ized in that the power supply is additionally improved by an adhesion.

12. A method for holding a power supply to a film, characterized in that the film has a hinged tab, which is first folded out of the residual body of the film, on ^¬ closing the power supply between the rest of the body and tab is inserted, and then the La see is bent back.

13. A method for producing an electric lamp, characterized in that first a power supply system is formed by clamping a power supply between the tab and the rest of a body sheet according to claim 12 and optionally a light ^¬ medium is attached to this system before or after this step, then then the Stromzufüh ^{¬ system is} introduced into an open glass flask and then the power supply system is squeezed in the film.