DE2025925A1 - Metal foils pipe and process for their manufacture - Google Patents

Description

Metal Foil Pipe and Process for Its Manufacture The invention relates to metal-foil or ribbon cables for tight introduction into glass-like cables Bulbs made of quartz or quartz glass or quartz-like high-temperature glasses, such as in the manufacture of pipes, and processes for the manufacture of such lines.

When making a tight introduction of a metallic conductor in a glass made of fused quartz or quartz-like glasses, for example 96% Glass containing silica, made flasks, restricts those for softening and fusing the quartz, the very high temperature required for the choice of the dense introduction of available metals in practice on molybdenum and tungsten. Both metals have coefficients of expansion that are much larger, i.e. ten times as big as that of quartz. About the cracking of the quartz at the sealing point To avoid cooling down, the conductor is hermetically sealed at least at that point introduced th part of the same formed as a thin tape or film.

The metal-foil sealing part of the conductor, which is used at a relative Has been connected to the quartz at a high temperature, only suffers a voltage without cracking when the quartz cools down and thereby cracking or Avoid chipping of the quartz at the sealing point.

The metal tape or foil should be used for an effective seal in which quartz have a width to thickness ratio of at least about 100: 1 and in the case of thicker tapes or foils, the thickness of the same should be after the edges taper at an angle that does not exceed 5 °.

Metal foils or strips with such a cross section can either are made by having a middle part of a piece of molybdenum wire, as described, for example, in US Pat. No. 2,667,595, or that a piece of metal foil is electrolytically etched. Rolled longitudinally from one Pieces of existing molybdenum wire lines are particularly suitable for lower currents. For higher currents or when heavier electrodes or wire leads through the metal strips or foils must be held during the sealing process, the etched metal foils are preferred. So far, such etched metal foils have been used generally produced in that a strip or band of the metal foil with a few millimeters wide was etched to make the side edges tapered and then the etched foil tape or strip into individual foil lines cut to the correct length required for the sealing point. An outer wire lead and either an inner wire lead or an electrode support wire were then welded to the opposite cut ends of each metal-foil line, to thereby a complete conductor arrangement for tight introduction into a lamp vessel Form from quartz.

Cutting off the individual etched foil lines from the etched Metal foil strip or tape leaves a ridge along the normal rwe ise Cut edges of every metal-foil line. As a result of fragility and The relatively small size of these thin metal foil lines is the distance the burr from the cut edges is a very difficult and impractical operation. The presence of these burrs along the cut edges of the metal-foil lines however, along with the noticeable thickness of the metal foil along the cut edges often a seal point defect as the fused quartz eventually turns into jumps near the cut edges when the sealing point has cooled down.

Another so far in the manufacture of etched metal-foil lines There is a problem with welded outer and inner wire leads in that when welding the wire leads to the thin metal foil, the foil is often completely burned out, creating a faulty weld. In addition, the power line capacity of the entire lead arrangement is determined by the limited to the thin film immediately adjacent to the weld. Around To overcome problems, it has been customary when welding the outer and / or the inner line to the metal-foil line this at the welding points thicken and thereby strengthen that small platelets of the metal foil material between the metal-foil line and the lead wires at the respective welding points inserted and welded on. The cutting, handling and assembly all of these various parts along with those required to form the assembly however, various welding operations make this assembly complicated to manufacture and expensive. Furthermore, make the welds on the inner and outer Wire lines and the metal-foil line and in particular the point of welding the outer wireline frequently a source of premature Defects in the finished sealing point.

It is therefore an object of the invention to provide a one-piece To deliver a line with a metal-foil line and an external supply line, in which only the part used for sealing is weakened at its circumference (feathered) is.

Another object of the invention is to provide a metal foil line with a novel construction that has an etched tongue part at one end with a completely tapered peripheral edge and at its other end has a non-etched contact line part.

Another object of the invention is to provide an electrical device to be delivered with a hermetically sealed pinch seal in which a supply line is located is inserted sealed, which consists of an etched metal-foil sealing part, which does not have an external weld between the sealing point and the external Has line part.

Another object of the invention is to provide a novel method for the production of thin metal foil cables with an etched tongue part at one end that has a fully tapered peripheral edge and one not to deliver etched contact part at the other end.

Another object of the invention is to provide a method of training of metal-foil cables of the specified type at high production speeds from a tape or a metal foil.

Another object of the invention is to provide a continuous To find a method for producing metal-foil lines of the type mentioned above, with a metal band in an interconnected sequence of Foil line sections is divided, which at the connection areas in such individual metal-foil lines can be divided.

According to one aspect of the invention, the conductor part is for the seal and for the external lead of the lead arrangement on the electrical device from a single piece of metal-foil tape with an etched tongue-shaped end, which is tapered on its entire peripheral edge and as a sealing part of the conductor arrangement serves, and a non-etched contact end part, which serves as the outer conductor of the Arrangement serves.

According to a further aspect of the invention, a strip or tape made of thin metal polie, e.g. molybdenum foil, initially with narrow slits equipped, which are attached along a side edge of the tape at intervals and extend inward across the tape. Then the face is slotted at the Side of the metal tape is electrolytically etched to cover the exposed edges of this Form the surface of the tape including the edges of the slots is tapered.

The strip or tape so formed is then attached to each of the slits cut across to divide it into individual foil lines.

Further objects and advantages of the invention can be seen from FIG The following detailed description of specific execution forms in the context with the pictures.

Figure 1 is a partial view of a strip or band of Mstall film, which according to the invention in one operation at a distance along a side edge Attached slots was provided and for the production of the invention Metal foil lines are used.

Figure 2 is a partial view of the metal foil tape or strip of Figure 1, after it has been electrolytically etched according to the invention to the exposed Edges of the face of the slotted side and 'at least the outermost parts of the Taper edges of the slots.

Figures 3 and 4 are similar to Figures 1 and 2; however, they show a modification of the invention in which etch-resistant protective coatings are limited Areas of the metal foil strip near the slit edge and between placed in the slots before etching and, as shown in Figure 4, after etching removed.

Figure 5 is a fragmentary view, on an enlarged scale, of one according to the invention finished etched foil line by separating the same from the etched one Metal foil strip or tape of Figure 2 is formed.

Figure 6 is a sectional view taken along line 6-6 of the Figure s figure 7 is a sectional view taken along line 7-7 of FIG.

Figures 8, 9 and 10 are views corresponding to Figures 5, 6 and 7 and show a modified form of the electrolytically etched Metal-foil-strip cut out of the metal-foil-strip of FIG. 4.

Figure 11 is a perspective view of the metal foil conduit according to Figure 5 to 7.

Figure 12 is a plan view, on an enlarged scale, of an electrical Incandescent lamp with a foil seal and connection structure according to the invention is provided.

FIG. 13 is a schematic representation of one according to the invention continuous process for the production of a strip or a metal foil and to form a series of foil line sections, which subsequently can be separated from one another by cutting to obtain the inventive Form single foil lines.

The foil line 1 (Figure 11). According to the invention consists of one short piece 2 of a thin metal-foil tape, for example a molybdenum or tungsten foil with a thickness of, for example, about 0.07 mm (0.003 inches) to 0.1 mm (0:004 inches). It has an etched tongue end part 3, which on his has a tapered edge 4 over the entire circumference.

The metal-foil tape 2 has a length and width correspondingly the length and width desired for the finished metal-foil line 1, for example. For example can in the particular case shown the metal foil strip or tape 2 are about 6 mm (1/4 inch) wide and about 25 mm (1 inch) long. The other end part 5 of the metal foil tape 2 is not etched and serves as the outer one Line or connection contact for the electric lamp or other electric Device into which the film line 1 is to be melted tightly. The outer one End portion 5 of the foil line is preferably near its outer end provided with an opening 6 with a circular shape or some other suitable shape, that during the formation of the sealing point for the precise determination of the position the foil line is used in the seal.

According to Figure 5, there is the etched tongue or inner end portion 3 of the foil line 1 preferably made of a generally violin-shaped or spade-shaped Part to thereby create a tapered edge 4 of greater length for sealing in the Quartz or quartz glass bulbs of an electric incandescent lamp or other electric Obtain device. Of the unetched outer end part 5 of the Foil line 1 from the thickness of the etched tongue end part 3 tapers gradually to a sharp edge 4 running essentially around its entire circumference corresponding to FIGS. 6 and 7. For certain purposes and in particular for use with inner wire leads of greater thickness attached to the etched tongue end portions of the Foil lines 1 are to be welded, the tongue end part 3 can be at his outer end with a thickened end plate welding surface 7 on one or both Sides of the foil line are formed. This is from the modified foil line 1 'of FIGS. 8 to 10 can be seen. The additional film thickness on the welding plateaus serves as additional protection against burning through the foil during welding the wire line to the foil line.

According to the invention, those described above and in the figures 5 to 11 film lines shown are economical and with high production speed be made by first a strip or tape 8 (Figure 1) from a thin metal foil, for example made of a molybdenum or tungsten foil having a thickness of about 0.07 mm (0.003 inches) to 0.1 mm (0.004 inches) with a Row of spaced narrow slots 9 in one side edge 10 of the Tape is made so that the tape is in a series of individual foil-line sections 11 is divided. The other side edge 12 of the metal foil strip 8 remains without such slots 9. As shown, the slots 9 extend across the Foil tape 8 and are arranged at a distance d from each other (Figure 1), the corresponds approximately to the width desired for the finished metal foil lines 1. The metal-foil tape 8 also has a width that is approximately that for the finished one Metal foil lines 1 corresponds to the desired length. For example, in the In the specific case shown, the metal-foil strip 8 has a width of approximately 25 mm (1 inch) and the slots 9 can be a distance d from about 6 mm (1/4 inch) apart. The slots 9 themselves can have a width of about 0.8 mm (1/32 inch) and they extend from edge 10 of the Band 8 from by a distance inwardly, which is at least the desired length of the etched tongue end part 3 of the finished foil lines 1 corresponds. In the particular illustrated case in which the etched tongue end part 3 of the finished foil line 1 is about 6 to 8 mm (1/4 to 5/16 inch) long, the slots can be 9 from the edge 10 of the foil tape 8 by a distance of about half of the Width of the band 8 or slightly more extend.

As shown in Figure 1, the slots 9 are preferably over a short part of its length seen from the edge 10 of the metal-foil strip 8 widened, as indicated at 13.

The widened parts 13 of the slots 9 can by flat U-shaped or approximately semicircular notches as shown are formed and extend from the inner end of part of the length of each foil line section 11 to the outside, which form the etched tongue end part 3 of the finished foil line 1 should, by a distance that is about half the length of the tongue end part 3. As shown, the metal-foil line 8 can also have a number of fastening openings 6 are formed of circular or other suitable shape, which located adjacent to the unslotted edge 12 and approximately on the center line of the respective line sections 11 are arranged.

If the modified form of the metal foil lines l 'accordingly Figures 8 to 10 is to be formed, the welding plateaus 7 at the outermost Has ends of the etched tongue end parts 3 of the foil lines, then in in this case the metal-foil tape 8 with discrete protective coatings 14 accordingly Figure 3 provided, which consist of a suitable etch-resistant cover material. These are on the few limited areas of the belt 8 adjacent to the Edge 10 and between the slots 9 attached to the finished film lines 1 'form the corresponding welding plate 7. These covering coatings 14 from Etch-resistant material can either be on both sides of the metal foil tape 8 or only on one side or successive coatings 14 can be attached alternately on opposite sides of the band 8. the Etch-resistant protective coatings 14 can consist of any suitable material, which resists the etching action of the etchant that the metal-foil tape @ during subsequent etching process is exposed. If, for example, the metal-foil tape 8 consists of molybdenum and then etched in an etching solution of sodium hydroxide the etch-resistant protective coatings can consist of one material9 the self-sealing adhesive material known commercially as black silicone rubber is (black silicone rubber auto seal flexible adhesive sealant) and from the General Electric Company is manufactured. This material is completely resistant to the etching action of the sodium hydroxide etching solution and therefore effectively covers the metal-foil tape 8 with respect to the etching effect of the etching solution. The material of the etch-resistant protective coatings 14 should adhere sufficiently well to the metal-foil strip or tape 8 to to remain firmly in place during the subsequent etching of the tape slotted metal foil strips or the band 8 either in a shape accordingly of Figure 1 or in the modified form corresponding to Figure 3, which applied Has etch-resistant coatings. is then essentially along its entire length electrolytically etched. However, the etching takes place only on the part of the width of the Tape, which extends from the slotted edge 10 to the line A-A (Figure 1) extends and corresponds approximately to the length which the etched tongue end parts 3 at the finished film lines 1 or 1 'should have. This will remove the exposed wanten this slotted part of the metal foil tape including the edges 10 and the edges of the slots 9 are tapered. The etching of the metal-foil strip or -band 8 can expediently be carried out in that the slotted Part of the strip 8 up to the etch line A-A (Figure 1) into a bath 15 (Figure t3) is immersed in a suitable etching electrolyte, for example in a 50% solution of sodium hydroxide if the metal foil strip or the Band 8 is made of molybdenum. The electrolyte bath 15 is contained in an etching tank 16. The metal foil strip or the tape 8 is in the electrolyte bath 15 between a pair of parallel copper rod electrodes 17 and 18 parallel to these are arranged, which are also immersed in the electrolyte bath and by electrical Conductor 19 and 20 with the opposite connections of an alternating voltage source 21 are connected. The etching of the metal-foil strip or tape 8 is long continued until all exposed edges of the tongue end parts 3 of the individual foil line sections 11 of the strip 8 are tapered so that they have a sharp edge and 3 Corners of the tongue end parts are rounded, as shown at 22 in FIGS is. The length of time during which the metal foil strip or tape 8 must be subjected to electrolytic etching in order to achieve this goal, depends of course on various factors, for example the current strength of the etching current supplied to the electrodes 17, 18, the distance between the metal-foil strip or tape 8 of electrodes 17, 18, the composition and temperature of the used electrolyte bath 15 and the composition and thickness and the section of the metal foil strip or tape to be etched off. However, for example for a molybdenum metal foil strip 8 of a thickness of about 0.07 mm (0.003 Inch) to a width of about 6 to 8 mm (1/4 to 5/16 inch) from its edge 10 is to be etched off and its broad side is at a distance of about 13 mm (1/2 inch) from the respective electrodes 17, 18 in an electrolyte bath of a 50% solution of sodium hydroxide is at room temperature, an etching time of about 1 to 2 minutes with an etching current of about 6 A at the electrodes 17, 18 sufficient to achieve the desired degree of etching of the metal foil strip or band 8 as described above.

The fastest etching occurs at the edges of the tongue end parts 3 of the foil line sections 11 of the strip 8 and is largest at the corners. This causes the corners to be rounded, as at 22 in Figures 2 and 4 4 is indicated, and the edges are tapered to a sharp edge, as is is shown at 4 in FIGS. 6 and 7.

However, the etching takes place over the entire tongue end parts 3 of the Metal strips 8, which are immersed in the electrolyte bath 15 a. In case of However, there are modified forms of the metal-foil strip 8 of FIG. 3 on limited areas at the outer ends of each of the tongue end parts 3 etch-resistant Protective coatings 14 on the metal strip 8 and the etching takes place on the entire tongue end parts 3 with the exception of areas covered by these etch-resistant protective coatings 14, where the etching electrolyte has no access to the metal foil. This gives limited thicker areas or plateaus 7 (Figure 4) at the outer ends of each foil line section 11 of the metal foil strip 8, where such areas of the tape through the etch-resistant Protective coatings 14 are covered. These thicker plateau areas 7 remain on the original thickness of the metal-foil strip in those cases where the covering uberztige 14 attached to both sides of the metal foil tape 8 are. However, they will be about 3/4 of the original foil thickness reduced in the case in which the covering coatings 14 are only on one side of the metal foil strip or tape 8 are attached. From the thickened end plate areas 7 on the etched tongue end parts 3 of the modified form of the metal-foil tape 8 according to FIG. 4, the film thickness tapers down to the thickness of the adjacent etched central and side surfaces 23 and 24 of the Tongue end parts 3, as shown in FIGS. 9, 10.

Along the center line of the etched tongue end portions 3 of each foil line section 11, the thickness in the central region 23 can be about half or less than that Be half the original thickness of the metal-foil strip before etching. Therefore, if the original film thickness is in the range between about 0.07 to 0.1 mm (0.003 to 0.004 inches) then the thickness along the centerline can be any Tongue end part 3 in the central area 23 after the etching about 0.025 mm (0.001 Inches). In the transverse direction to this, the thickness of the tongue end part tapers 3 of each foil line section 11 towards the edges to 0, as at 4 in FIG Figures 6 and 9 shown.

After the end of the etching process, the etched metal-foil strip is made 8 is withdrawn from the electrolyte bath 15 and in the case of the modified form of the etched foil strip 8 according to FIG. 4, the protective coatings 14 of the strip 8 stripped in a suitable manner, for example by scraping the Coating layer 14 from tape 8 with a doctor blade. Then any residual electrolyte removed from the strip or tape 8 in a suitable manner, for example by Washing up. A water jet 25 is thereby directed against the opposite broad sides of the strip or band 8 directed from spray nozzles 26 (Figure 13) or the metal-foil strip 8 is immersed in a water bath.

The remaining on the metal foil strip 8 is preferably used Residual electrolyte is removed by first turning the tape into a neutralizing one Acid bath 27 (FIG. 13), which is contained in a tank 28, is immersed. Through this causes the remaining sodium hydroxide etching agent, which is a lye, reacts with the acid and forms a salt. Then the resulting reaction product becomes along with residual acid or other remaining on the strip or tape 8 Foreign material washed off in a suitable manner. This is preferably done by the existence Water jet 25 from the nozzles 26 against the opposite the broadsides of the strip 8 is directed and then this in an alcohol bath is immersed in a tank, not shown. The alcohol absorbs the rest Rinse water on the strip or band 8 and it is therefore easier to close the strip dry than in the case where only water is used. The one through the above described method steps obtained metal-foil strips 8 (Figure 2 and 4) consists of a succession of foil line sections 11 with etched Tongue end parts 3 with a tapered edge and the shape described above, the Sections at their outer contact end parts 5 (Figure 2 and Figure 4) along the not slotted side or edge 12 of the tape are connected. The strip will then in the transverse direction at each of the slots 9 along the cutting lines 29 accordingly Figure 2 separated to thereby the strip 8 in individual foil lines 1 or 1 '(Figure 5 to Figure 11) to be divided. Each of these foil lines 1 or 19 has an etched tongue end part 3 provided with tapered edges for welding with the inner wire line 30 of a filament holder 31 according to FIG. 12. It can then be placed in a quartz bulb in an electric lamp in the can be introduced in a sealed manner in the usual way in lamp manufacture. In the event of of the foil lines 1 'of the modified form according to FIGS. 8 to 10, which has at the outer ends of the etched tongue end parts 3 welding plateaus 7, is used the additional thickness of the metal foil on the welding plateaus 7 as additional Security against burning through of the foil while the inner ones are being welded on Wire line 30 to the foil line 1 '.

The inventive method described above for the preparation of Foil lines 1 or 1 'according to FIGS. 5 to 11 can be used as a serial production process be exercised in the individual metal foil strips 8 of a certain length to desired foil line sections 11 according to the characters 2 and 4 reshaped and then later cut into individual foil lines 1 or 1t will. Or the foil line sections 11 can instead be made from the metal foil tape 8 can be cut out before etching and then individually etched to make the finished Produce foil lines 1 or 1 '. Preferably, however, the described Process carried out as a continuous production process according to FIG. The metal-foil strip 8 to be processed is in the form of a continuous one Tape that may be contained on a supply reel 32. The continuous Band 8 of the metal foil on the supply reel 32 can either already be with the im Spaced slots 9 (Figure 1 and 3) be provided or it can be an unmachined Tape without slits. When the supply of metal tape 8 on the spool 32 the unmachined shape with no slits, it is withdrawn from the spool 32 and-in suitable devices introduced, for example into a punch (not shown) for making the slots. The slots s 9 stamped in the side edge 10 of the tape. The slotted continuous Metal-foil tape 8 is then passed through the with the slotted edge 10 downwards Electrolyte bath 15 guided in tank 16 (this can be done, for example, by that the tape passes through suitable liquid seals 33 in the side walls of the tank 16 is performed). The tape is placed between the parallel copper rod electrodes 17, 18 passed in parallel in the tank, which via the conductors 19, 20 with a AC voltage source 21 are connected. This causes the electrolytic etching of the continuous metal foil strip 8 in the desired final shape, as described in connection with FIGS. 2 and 4. During the passage through the etching tank 16 is only the slotted side edge 10 of the metal-foil tape 8 into the electrolyte bath 15 up to the desired etching line A-A (Figure 1) of the strip immersed. The speed of implementation of the metal-foil tape 8 by the etching electrolyte bath 15 and the Etching time are taking into account the other factors for the etching speed, for example the etching current, the Composition and temperature of the etching electrolyte, the composition, thickness and Width of the metal-foil strip 8 and the distance between it and the electrodes 17 and 18 are set so that the desired degree of Etching of the metal foil strip 8 is obtained.

The etching tank 16 becomes the continuous strip 8 of the metal foil then through a neutralizing acid bath 27 in a tank 28 through suitable liquid seals 33 and thereby causes any remaining alkali electrolyte on the tape 15 (for example sodium hydroxide solution) reacts with the acid to form salt. From the. neutralizing acid bath 27, the band 8 is then attached to the water jets 25 passed by, the spray nozzles 26 against opposite broad sides of the The tape should be directed to the reaction product of the neutralizing acid 27 and the electrolyte 15 as well as any residual acid remaining on the belt 8 to wash off. The washed tape 8 can then, if desired, be washed through an alcohol rinse (not shown) to absorb the remaining on the belt 8 Coil of water to cause the alcohol. Then it is passed through a pair of air vents 34 guided through a pair of air nozzles 35 against the opposite broad sides of the belt 8 are directed in order to effect a thorough drying of the belt. The dried metal foil tape 8 can then be wound onto a take-up reel 36 will. This can be rotated in a suitable manner to allow the tape to be pulled off 8 from the supply spool 32 and its advancement through the tanks 16 and 28 to cause. The wound tape 8 can then later, if necessary, in individual foil lines 1 or 1 'can be separated. Or the processed tape 8 can be passed through a pair of suitable rollers (not shown) are fed to a separating device 37, the For example, a fixed knife 38 and a movable shear knife 39 for Cut of the strip 8 along the cutting lines 29 running in the transverse direction into individual pieces Foil lines 1 or 1 'includes.

The above-described continuous method according to the invention for producing a shaped metal-foil tape 8 with that in connection with Figures 2 and 4 described shape and for the subsequent separation of the shaped Ribbon 8 in individual foil lines 1 or 10 of the ones shown in Figures 5 to 11 Shape is particularly advantageous for the following reason: The continuous forward movement or the passage of the metal-foil strip 8 through the etching electrolyte bath 15 acts so as to destroy the vesicles which are usually easily found in the etching electrolyte solution 15 form during the etching process and partially through the passage of the etching current inhibit the electrolyte and thereby a fluctuation in the etching rate and thus effect of the degree of etching of the metal-foil tape. The destruction of the vesicles in the etching electrolyte 15 ensures a more uniform flow of current through the Etching electrolytes at any point in time during the etching process and thus a more uniform one Etching of the metal-foil tape 8. Therefore, the inventive continuous Process a greater reproducibility of the results in terms of shape and shape of the etched metal-foil tape and the individual ones separated therefrom Foil lines 1 or 1 'guaranteed. The movement of the metal-foil tape continues to act 8 through the Ätzelektrolytbad 15 so that they the heating of the electrolyte by the etching current flowing through is reduced to a minimum and uniform heating of the electrolyte guaranteed. Since the etching electrolyte solution 15 with an increase in temperature becomes more aggressive and its etching speed increases, ensures the reduction the heating of the electrolyte by the Xtz current and better compliance with a uniform Temperature during the etching process, which is inherent in the process described above are also a bigger one Reproducibility and uniformity the results regarding the shape and form of the etched metal-foil tape 8 and the subsequently separated film lines 1 or 1 'therefrom.

Figure 12 shows an electrical device, for example one electric incandescent lamp 40 of the known Wolf ram halogen type with regeneration cycle, which is provided with a supply line arrangement and seal according to the invention. The exemplary lamp 40 shown includes a tubular bulb 41 Quartz or quartz-like glass is conventional at its opposite ends Contains pinch seals 42. In each of the press seals 42 is the etched one Tongue end part 3 of a foil line 1 or 1 ′ provided with tapered edges according to FIG of the invention sealed and melted down at the outer end of the tongue end part 3 has a welded wire line 30. As shown are the foil leads 1 or 1 'fused into the pinch seals 42 so that the etched planar Tongue end parts 3 protrude into the flattened pinch seals 42 and there are embedded and the non-etched contact end parts 5 at the outer ends of the Pinch seals 42 protrude outwardly from the piston and thereby act as connection contacts serve for the lamp. Inside the piston 41, a Wolf ram filament 43 is arranged, for example in the form of a linear coil or a double helix made of tungsten wire, which is mounted more or less axially inside the piston 41. The filament 43 is at its opposite ends in a suitable manner, for example by connecting support wires 44, connected to the inner wire leads 30, the are welded to the respective metal foil lines 1 or 1 '. The piston 41 also contains, in a manner known per se, a filling made of an inert gas, for example Argon and a small amount of a halogen such as iodine or bromine or compounds of these elements. The piston 41 is evacuated and the gas filling through the pump tube 45 entered, which then, as indicated at 46, melted off will. In the manufacture of such a lamp 40, the filament 43 is turned on first its opposite ends, for example with the help of the connecting wires 44, connected to the inner wire lines 30 of the respective foil lines 1 or 1 ', to form a lamp holder assembly 31. This is then in the tubular Piston 41 inserted and held in place for sealing while the press seals 42 are formed at opposite ends of the piston. In addition, the gas filling is introduced and the pump tube is melted. All these Operations and procedures.

are known per se. During the sealing of the introduction of the lamp holder assembly 31 in the piston 41 can this arrangement 31 by a suitable assembly device (not shown) precisely held in place, which are in engagement with the Holding openings 6 of the foil lines 1 or 1 'is. This will make the manufacture of the lamps with uniformly centered and aligned filaments 43 inside of the lamp bulb 41 enables. If desired, on the outstanding exterior End part 5 of each of the foil lines 1 or 1 'an additional piece of metal or Connection part 47, as indicated by the dashed lines in FIG. 12, in a suitable manner Wise attached, for example by welding or stapling and as Serving connection contact part for the lamp.

The metal-foil lines 1 or 1 'according to the invention are very much easier to manufacture and at lower cost than the familiar from many Share composite lead assemblies with metal foils and those mentioned above Ribbon cables made from rolled wire. For example, the metal-foil lines according to the invention at a cost of about 1/50 of the cost of a rolled Wire-made tape lead are made. Also with lamps Metal-foil lines according to the invention a defect in the seal and a more appropriate premature failure of the lamp itself due to corrosion of the external weld, as it occurred with the known feeder arrangements, practically eliminated, since there is no such external weld. This enables the use of the Metal foil line 1 or 1 'according to the invention a longer lamp life. Furthermore, the sealing points in which metal-foil lines according to the invention 1 or 1 'can be used, safely used at temperatures well above 300 ° as they occur with lamps that are designed for high current loads, without the likelihood of a defect in the seal due to corrosion the line exists. In contrast, such operation is at a high temperature the sealing point is not conceivable with seals made from rolled wire Ribbon lines are included because of the susceptibility of such lines to corrosion at elevated temperatures of the sealing point.

Claims (11)

Expectations: 1. Process for the production of a thin metal-foil line for Sealing in a glass-like material, d a d u r c h e k e n n n z e i c h n e t that on the opposite side edges of a short piece of metal-foil tape (8) a pair of opposing slots (9) is formed and then an end portion (3) the length of the tape including the slots (9) is electrolytically etched to to taper the edges of the end part all around. 2. The method according to claim 1, d a d u r c h g e k e n n -z e i c h n e t that the slots (9) are essentially U-shaped. 3. Process for the production of thin metal-foil lines for sealing Introduction to vitreous materials, d a d u d u n e n g e n i n e t that in a side edge (10) of a band (8) made of metal foil slots (9) in the Distance from each other along the edge (10) are formed, only the area of the slotted side of the metal foil tape (8) is electrolytically etched and the exposed edges (4) of the same are tapered, and then the metal band (8) at each of the slits (9) cut in the transverse direction and the tape into individual ones Foil lines (1, 1 ') are divided, each with an etched tongue end part (3) with edges that are tapered around the entire circumference and one that is not etched Contact end part (5) included. 4. The method according to claim 3, d a d u r c h g e k e n n -z e i c h n e t that the slots (9) in the metal-foil tape with widened inner parts (13) are formed. 5. The method according to claim 1 or 3, d a by gek e n n z e i c h n e t that the metal-foil tape (8) consists of molybdenum. 6. Metal-foil tape for tight introduction into vitreous materials, d u r c h e k e n n n z e i c h n e t that there is a short piece of a metal-foil tape (8) with an etched tongue end part (3), which on its entire circumference with a tapered edge (4) is provided, and an unetched contact end part (5) owns. 7. metal foil line according to claim 6, d a d u r c h g e k e n n.z e i c h e t that the tongue end part (3) is approximately spade-shaped. 8. metal foil line according to claim 6, d a d u r c h g e k e n Note that it is made of molybdenum. 9. Electrical device with a tightly sealed plunger vitreous material, which has a pinch seal part and one through the Pinch seal feed line arrangement leading through, d a d u r c h e -k e n n n I would like to point out that the lead arrangement is a short piece of metal-foil tape with an etched tongue end part (3) which is tapered at its entire end Edge (4) is provided and completely embedded in the pinch seal (42) and there is sealed, an unetched contact end part (5), the outside of the pinch seal (42) protrudes from, and an inner one welded to the end of the tongue end part and a conduit (30) projecting into the piston (41). 10. Electrical device according to claim 9, d a d u r c h g e k e It is noted that the piston (41) consists of quartz glass and the metal-foil tape consists of molybdenum. 11. Electrical device according to claim 9, d a d u r c h g e k e n n n z e i n e t that you still have one on the one from the pinch seal (42) attached protruding unetched contact end part (5) of the metal foil tape Has connecting contact part (47). L e r s e i t e