EP1355344A2 - Electric lamp - Google Patents

Abstract

An electric lamp comprises a hermetically sealed bulb (2) made of light transparent material, a filament (5) with two end regions (6), an electricity supply, and foil sections (8). The electricity supply consists of inner and outer sections (7,9), and the inner end holds the light body. The ends of the filament connections are joined to a foil, and the foil ends are folded over. The folded section has a reduced surface on at least one of its two free corners.

Description

Technical field

The invention is based on an electric lamp according to the preamble of claim 1. These are in particular squeezed on two sides Incandescent lamps with an axially arranged filament.

State of the art

A generic halogen incandescent lamp is already known from the document EP-A 475 508 known. An end region of the cylindrical filament is through a power supply inserted therein is mechanically supported by the Power supply is bent asymmetrically in one plane. In particular is they shaped so that on a first axially parallel leg of the Power supply a second leg is formed with a free end. The free end hooks behind a turn of the filament that is spaced from the end of the filament is one-sided, while the first leg opposite the free end on the turns of the filament is applied. The film-side end of the power supply is more common on the film Way welded. The disadvantage of this construction is that the centering of the filament and the power supply system because of the asymmetrical Shape of the power supply is not reliably guaranteed is. In addition, the welding process is very time-consuming and costly.

Presentation of the invention

It is an object of the present invention to provide an electric lamp, in particular To provide halogen incandescent lamp according to the preamble of claim 1, to provide an electric lamp that is simple and quick is to be produced.

This object is achieved by the characterizing features of claim 1 solved. Particularly advantageous configurations can be found in the dependent ones Claims.

The present invention is based on a simple design, if possible symmetrical power supply, which is advantageous spring action exerts on the illuminant and thus automatically the centering of the filament ensures. The concept of this power supply has the particular advantage that the connection to the film is not by welding, but by mechanical contact. It doesn't just mean that Costs and manufacturing time significantly reduced, but there are also no potential Weaknesses. Previously, an expensive platinum paste had to be used for welding to be used. The area of the welding spot was also previously the Exposed to oxidation, which reduced the lifespan.

In particular, the halogen incandescent lamp according to the invention has a hermetic seal sealed piston made of translucent material on the one Lamp axis defined. Furthermore, it has a preferably axially arranged coiled (and thus cylindrically shaped) filament with two ends and a power supply system that connects to the two end areas of the filament is connected. The power supply system includes a film and an inner and outer power supply, the filament side inner end of the power supply the end region of the filament from the inside. The foil-side outer end of the power supply is connected to the film. The power supply itself is U-shaped bent by two free legs, advantageously loaded with spring force lie in one plane and connected to each other via a straight base are. The section on the filament side is at the end of the associated film folded back and forms a fold in which the base is mechanically held is. The ends of the free legs protrude into an end region of the filament into it. At least one hook part is on one of the free legs to the outside. This hook part engages between two turns of the Filament.

The area of the folded end portion of the film is normal rectangular. Such a folded-over rectangular end section of the film is already known from EP-A 780 883. However, this area is now preferred reduced to at least one or both free corners. This facilitates the automatic hooking of the power supply in the fold of the Foil. This also saves film material. The folded one Section is preferably triangular (symmetrical or asymmetrical). However, it can also be rounded, for example. This cheap In principle, the design of the end section of the film is independent of the special way of providing a power supply suspended in the film. In principle, it is for both external and internal power supply suitable. For this special shape of the folded end section with a reduced area is therefore independent of the special shape of the Protection in the power supply hooked into it. This one folded In principle, the end section can also be used for other lamp types (in particular Discharge lamps with metal halide filling can be used.

Each of the two legs preferably has a hook part. This will improved the bracket and ensured the centering even better.

The legs are usually the same length. However, it is for special applications advantageous to use legs of different lengths.

The concept according to the invention is particularly good for a halogen incandescent lamp suitable, which is squeezed on two or one side. You can both end areas are supported by a new type of power supply.

The diameter of the wire is advantageous for the power supply is used, at least as large as the distance between two turns of the filament. In this way, the bracket is not only caused by the tension between the two ends of the filament, but also or mainly through a clamping intervention of the hook part between two turns of the filament. Is preferred the wire diameter of the power supply is greater than the distance between two Turns of the filament, so that the filament when inserting the Power supply is spread slightly; it is preferably 10 to 30% larger, see above that on the one hand the clamping intervention is easy to accomplish and on the other hand the holding force is still sufficiently safe.

The easiest way is to hook the hook part in the plane of the power supply. However, it can also be curved outside of this level. the Point the two hook parts of the two legs in opposite directions.

To reliably prevent the hook part from slipping out of the lamp avoid, the hook part preferably protrudes slightly above the lamp outwards.

The free legs can run straight and axially parallel, which is the easiest is to be produced. In another embodiment, the legs are shaped so that the width of the film regardless of dimensions of the filament can be selected. For this, the legs are either inclined inwards towards the axis, or the two legs point in one particularly preferred embodiment just before the end of the Filament has an inward curvature that defines the distance between the thigh ends reduced. This shape is the end area of the filament ideally adjusted so that the holder and centering of the filament works particularly reliably.

The hook part preferably forms an outwardly protruding angle to Leg, the hook part at an angle α between 30 ° and 120 °, in particular about 50 ° to 60 °, is bent relative to the free leg.

In order to ensure a secure mounting, the legs should at least two turns, preferably more than 3 turns, in the end area of the filament are introduced.

The power supply is mostly made of tungsten or molybdenum.

It should be noted that the hook part must be designed so that the filament side Width when compressed is always smaller than that Inner diameter of the filament is. The length of the two hook parts (in the case of their right-angled bend) or their length in projection transverse to the lamp axis (in the event that the hook parts are at an acute angle to the Legs are arranged) may therefore at most half the inner diameter correspond to the cylinder formed by the filament. In the event of of a single hook part is accordingly a length up to the full Inside diameter permitted.

A method of manufacturing the halogen incandescent lamp described above is based on the fact that the power supply with the two legs initially is squeezed. The power supply is in this state introduced the end region of the filament at least two turns. The legs snap open when the power supply is relaxed outside and press evenly from the inside against the end area of the Illuminant. The hook part (s) press into the space jamming between two turns. For that the tension is the Helix advantageous because it increases the distance between two turns. Then a unit consisting of the film and the attached external lead, at the base of the inner power supply attached. For this purpose, the lamp-side section of the film initially angled only by more than 90 ° (preferably at least 100 °) that there is a fold in the film. The internal power supply is in this with its base hooked in and the filament in relation to the foil underneath Tension held. Then the angled section of the Angled the film further until it describes a bend of a total of 180 ° Has. For transport to the further production steps (in particular Squeeze) the tension is maintained so that the The hook part cannot slip out of the fold of the film. When squeezing of the piston end around the film are preferably pinch jaws with an in used about central knob. The knob is raised against the rest Squeeze surface and causes a lot of piston material (quartz glass is preferred used) is pressed between the legs of the power supply. This not only ensures a secure hold of the power supply, but also achieved that even the film in the middle during the squeezing process the bruise remains centered.

The invention is preferred for double-sided pinched halogen incandescent lamps (Festoons) suitable. But the application is also with other lamps possible, for example with lamps pinched on one side.

characters

Figur 1

eine Soffittenlampe

Figur 2

eine vergrößerte Darstellung des Stromzuführungssystems

Figur 3

ein weiteres Ausführungsbeispiel des Stromzuführungssystems

Figur 4

ein weiteres Ausführungsbeispiel des Stromzuführungssystems

Figur 5

ein weiteres Ausführungsbeispiel einer Stromzuführung

Figur 6

ein weiteres Ausführungsbeispiel einer Stromzuführung

Figur 7

ein Ausführungsbeispiel einer einseitig gequetschten Halogenglühlampe

The invention will be explained in more detail below with the aid of several exemplary embodiments. Show it:

Figure 1

a festoon lamp

Figure 2

an enlarged view of the power supply system

Figure 3

another embodiment of the power supply system

Figure 4

another embodiment of the power supply system

Figure 5

another embodiment of a power supply

Figure 6

another embodiment of a power supply

Figure 7

an embodiment of a halogen lamp pinched on one side

Description of the drawings

FIG. 1 shows a double-ended, socketed halogen incandescent lamp 1 (Soffitte) for general lighting with an output of 150 W. It is for suitable for direct connection to the 230 V network and has a cylindrical Piston 2 made of quartz glass. A pump stem 3 is attached in the middle. The Both ends of the piston are each closed with a pinch seal 4. The piston 2 is filled with argon, which is a known halogen additive Attached is.

An axially arranged filament 5 with a luminous central section is simply spiraled (or in another embodiment double coiled). The (primary) spiral of the simply spiraled Filament (or the secondary coil of the double-coiled Luminous body) thus forms a cylindrical body. The distance between two turns is about 50 µm with a wire diameter of about 190 µm. The luminous element 5 has an end region 6 at each end with a steep incline. There the distance between two turns is about 500 µm. The luminous element is connected via internal power supply lines 7 Molybdenum foils 8 in the press seals 4 at the ends of the piston are embedded, connected. At the outer ends of the molybdenum foils electrical external leads (external power supply lines) 9 are welded on, which are connected to contacts in the ceramic bases 10.

In Figure 2, the power supply system is shown in more detail. The end area 6 of the filament extends over a few turns (schematic only one turn is shown). The power supply 7 made of tungsten a diameter of the wire of about 600 microns is bent approximately into a U-shape and has a straight base 15. It is suspended in a fold 12 of the film, formed by folding back an end portion 11 of the film is the filament side on the film 8 in the form of an asymmetrical to Lamp axis arranged triangle is attached. At the base 15 of the Power supply set at right angles to two resilient legs 16, the free ends 18 are angled inwards (17) and extend into the interior of the end region 6 of the filament. The bend 17 forms shortly before the end of the filament an inward bend 17, the free leg ends 18 each on the inside of the turns of the End area 6 abut. The leg ends 18 are advantageous before insertion slightly bent outwards in the filament, so that they are installed Condition still exert a certain spring force.

At the ends of the leg ends there are approximately 1 mm short hook parts 20 bent outwards at a right angle. They are between two turns of the filament are jammed and protrude beyond the turns Outside.

This version is suitable for small wattages where the Luminous body is relatively small and unstable for electrical reasons.

In a further exemplary embodiment according to FIG. 3, the first leg end 18 shaped exactly as in Figure 2 with a hook end. The second Leg end 19 is, however, much longer than the first. It serves as a guide. With him the hook part is directed inwards. The end section 13 of the film is rounded in this embodiment.

In a further exemplary embodiment according to FIG. 4, the luminous element is 25 a high-watt lamp (500 W) so stable that the hook parts 26, the are bent back at an acute angle at an angle α of 45 ° are hooked in after the second turn. The curvature 27 of the legs 28 is bent more smoothly than in the first embodiment. This variant is preferably applicable with a relatively large diameter of the power supply. The folded end portion 14 has the shape of a triangle that is symmetrical is arranged to the lamp axis.

In a further exemplary embodiment of a power supply system 29 5, the legs 30 are set at right angles to the base 31 and run parallel to each other. The hook parts 32 are angled by 90 ° and protrude opposite each other perpendicularly from the plane of the legs 30 out.

In a further exemplary embodiment of a power supply system 34 6, the legs 35 are inclined obliquely inwards on the base 36 stated. The hook parts 37 are angled at 110 ° and remain in the System level consisting of leg 35 and base 36.

FIG. 7 shows a halogen incandescent lamp 40 which is pinched on one side and whose two molybdenum foils 41 parallel to one another in a single pinch 42 are embedded. Both inner power supply lines 43 are similar to that in FIG Figure 2 described constructed and hold the ends of a U-shaped curve Filament 44.

Claims (6)

Electric lamp with a hermetically sealed bulb (2) made of translucent material that defines a lamp axis, a lamp (5) with two end regions (6) and a power supply system that is connected to the two end regions (6) of the lamp, the power supply system Foil (8) and inner and outer power supply lines (7; 9), and wherein the filament side inner end of the inner power supply line holds the filament, and wherein the film side outer end of the inner power supply line as well as the outer power supply line (9) with the film ( 8) is connected, and wherein at least one section (11) is folded back at one end of the film and forms a fold (12), and wherein at least one of the power supply lines is mechanically held in this at least one fold (12), characterized in that the folded section (11) of the film has a reduced area at at least one of its two free corners has. Electric lamp according to claim 1, characterized in that the folded section is triangular or rounded. Electric lamp according to claim 1, characterized in that the inner power supply is bent in a U-shape and is held by the folded section. Electric lamp according to claim 3, characterized in that the U-shaped power supply has two legs, which are either the same length or different lengths. Electric lamp according to Claim 1, characterized in that it is a halogen incandescent lamp (1; 40) which is squeezed on one or two sides. Electric lamp according to claim 4, characterized in that the free legs are axially parallel (Fig. 5) or straight inward, towards the axis, inclined (Figure 6) or have a curvature (17; 27) which the distance between them reduced.

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