EP2606277B1 - High-pressure discharge lamp having a reference ring, and method for producing the high-pressure discharge lamp - Google Patents

Description

Technical area

The invention is based on a high-pressure discharge lamp (hereinafter referred to as D-lamp) with an adjusted reference ring according to the preamble of patent claim 1.

State of the art

The EP 0 384 240 A2 discloses a halogen bulb for car headlights (see FIGS. 7 and 8 ) with several features of claim 1; in particular a reference ring 34 + 40 for the correct positioning of the lamp, consisting of a first sleeve-shaped ring member 40,50 and a second sleeve-shaped ring member 34,37. The first 40,50 and the second 34,37 ring member each have radially outwardly axially oppositely extending bends 43 + 44 and 38 + 39, each with a predefined axial edge height, the interfitted under peripheral surface contact and the outer circumference of the thereby lying outside fold 39th are welded.

The US 5,339,002 discloses a kittlos capped electric lamp with a three-piece base consisting of a holding element with radially inwardly projecting retaining tabs 8 for the lamp envelope, a tubular Justierhülse which surrounds the holding member at least partially and in which the holding element is displaceable prior to fastening, and a bottom part.

The WO 2008/110969 A2 discloses a high-pressure discharge lamp according to the preamble of claim 1 consisting of high-pressure discharge burner with a sleeve-like socket formed thereon, which is inserted into a holder. For this purpose, the holder has a ring consisting of an inner lower part and an outer upper part, the each formed as a deep-drawn parts of a metal sheet (pressed / stamped) and are inserted axially into each other and clamped by Umbördelungen each other.

The lower, inner ring is formed with four circumferentially equally spaced, axially projecting pedestals or projections which are axially passed through the inner through hole of the upper outer ring and to which the outer ring is clamped by bent clamping tabs. Between the projections in this case remain Unfangsspalte, are guided by the retaining tabs radially inwardly and axially upwards, the upper outer ring are formed. These retaining tabs, which look like leaf springs, are end-to-end in contact with the socket of the burner and welded or soldered there. The term burner designates in this patent application a structural unit consisting of a discharge vessel and an outer vessel enclosing the discharge vessel.

A standardized metallic reference ring of a high-pressure discharge lamp according to the above definition must have a tightly tolerated ring thickness, which must be reproducibly met by the selected manufacturing technology. In the construction and mounting of the known from the above-mentioned prior art reference ring accurate compliance with its tightly tolerated thickness is demonstrably difficult. This increases the reject rate and thus the total unit costs.

Presentation of the invention

The object of the present invention is therefore to provide a high-pressure discharge lamp and in particular a metallic reference ring for the discharge lamp, in which the required close tolerance in the ring thickness can be better maintained.

This object is achieved by a high-pressure discharge lamp having the features of patent claim 1.

Particularly advantageous embodiments can be found in the dependent claims.

Accordingly, it is contemplated the high pressure discharge lamp according to the invention formed with a reference ring consisting of a first sleeve-shaped ring member with collar and a second sleeve-shaped ring member, are formed on the radially inwardly projecting, circumferentially spaced retaining tabs. It is essential that the first and the second ring part radially on the outside have axially opposite set edges, of which at least one fold has a predefined edge height. The folds are arranged so that they are joined together under circumferential surface contact and welded at least point-shaped on the outer circumference of the thereby lying outside fold. The at least one fold with defined edge height is relevant to the minimum possible thickness of the reference ring.

The Abkantungshöhe of the first, in this case, inner ring is chosen so that when axial abutment of the fold of the inner ring on the second outer ring, the reference ring assumes a defined clear height or thickness. In this way, the reference ring thickness depends only on the correct Abkanthöhe and can be reproduced regularly with great accuracy.

Furthermore, it is preferred if the radially outer bevel is formed on its peripheral side with a number of circumferentially substantially uniformly spaced flats defining the spot welds. Thus, a material order takes place only at those points of the fold, which were previously thinned, so that at completion a substantial consistent wall thickness without subsequent thermal stress peaks is achieved.

Short description of the drawing (s)

Fig. 1

die Perspektivenansicht (ISO-Ansicht) einer Hochdruck-Entladungslampe (nachfolgend als D-Lampe bezeichnet) gemäß einem bevorzugten Ausführungsbeispiel der Erfindung in fertig montiertem Zustand,

Fig. 2

die Seitenansicht der D-Lampe gemäß der Fig. 1,

Fig. 3

die Draufsicht der D-Lampe gemäß der Fig. 1,

Fig. 4

den ersten Längsschnitt der D-Lampe gemäß der Fig. 1,

Fig. 5

den zweiten Längsschnitt der D-Lampe gemäß der Fig. 1 senkrecht zum Seitenriss gemäß der Fig. 4,

Fig. 6

den Querschnitt eines metallischen Referenzrings gemäß dem bevorzugten Ausführungsbeispiel der Erfindung

Fig. 7

den Längsschnitt des Referenzrings gemäß der Fig. 6 und

Fig. 8

den Längsschnitt des erfindungsgemäßen Referenzrings einschließlich oberer und unterer Montageaufnahmen.

In the following, the invention will be explained in more detail with reference to an embodiment. The figures show:

Fig. 1

Perspective view (ISO view) of a high pressure discharge lamp (hereinafter referred to as D lamp) according to a preferred embodiment of the invention in fully assembled condition,

Fig. 2

the side view of the D-lamp according to the Fig. 1 .

Fig. 3

the top view of the D-lamp according to the Fig. 1 .

Fig. 4

the first longitudinal section of the D-lamp according to the Fig. 1 .

Fig. 5

the second longitudinal section of the D-lamp according to the Fig. 1 perpendicular to the side elevation according to Fig. 4 .

Fig. 6

the cross section of a metallic reference ring according to the preferred embodiment of the invention

Fig. 7

the longitudinal section of the reference ring according to the Fig. 6 and

Fig. 8

the longitudinal section of the reference ring according to the invention including upper and lower mounting shots.

Preferred embodiment of the invention

According to the Fig. 1 has a D-lamp of the preferred embodiment of the invention, a metallic reference ring 1, in which a burner 2 is held firmly in a certain relative position and which is fixed on a housing 3 of an electronic module, not shown.

The housing 3 preferably includes the ignition electronics of the D-lamp (not shown) and is formed with a connection shaft 4, in which a number of contact pins 5 for the electrical connection of the D-lamp to a Voltage source (not shown) protrude, as shown in the Fig. 1 and 4 is indicated schematically.

The burner 2 consists of a discharge vessel 7, in whose interior two opposing electrodes and xenon and metal halides are enclosed for generating a gas discharge, and an outer bulb 6, which encloses the discharge vessel 7 and is fixed to the discharge vessel 7. At one end portion of the cylindrical outer piston 6, a metallic, bush-like socket 8 is firmly attached, which surrounds the outer bulb 6 like a sleeve over a certain length.

Like from the 4 and 5 can be seen, the housing 3 of the ignition electronics forms an open towards the outside, that is unlocked on one side receiving space 9, at the bottom of electrical contacts 10 are arranged, which are connected to projecting from the discharge vessel 7 power supply lines 11, 12 for the electrodes. The power supply lines 11 protrude out of the ends of the discharge vessel 7 and the burner 2, wherein, according to the 4 and 5 which is fed back from the housing 3 remote from the end of the discharge vessel 7 power supply 11 by means of a soldered or welded thereto, electrically insulated extension wire 12 to the housing 3, so that upon insertion of the burner 2 in the receiving space 9, the end of the projecting into the receiving space 9 Power supply 11 and the end of the extension wire 12 come into contact with each one of the contacts 10 simultaneously.

For fixing the burner 2 on the housing 3, the reference ring 1 is arranged around the metal sleeve 8, in which the outer bulb 6 is fixed. This reference ring 1 is in the Fig.6 to 8 shown in more detail.

Accordingly, the reference ring 1 according to the invention consists of two separate ring parts 13, 14, which are each punched from a metallic material, preferably a sheet metal part and cold formed by deep drawing. In the specific case, a second reference ring member 13 has a substantially planar annular disc 15 which is bent at its outer periphery, resulting in an axially extending bevel 16 of predetermined axial length. On the inner circumference of the annular disc 15 are a number of radially inwardly projecting, and in the circumferential direction (uniformly) spaced tabs 17 are punched, which are bent in the axial direction to form clamping feet. Finally, the second reference ring part 13 has a number of flattenings 19 in the radially outer region of the fold 16 (radially outer fold surface area), for example as a result of press-fit or cut-outs where the radius of the upper reference ring member 13 is reduced accordingly.

The first reference ring portion 14 has a central cup-shaped portion 20, the bottom of which has a circular opening 21 approximately with a diameter corresponding to the inner diameter of the annular disc 15 of the upper reference ring portion 13. Further, in the bottom portion is radial offset from the circular opening another through hole 22 is provided (see Fig. 6 ). The axial edge portion 23 of the cup portion 20 is everted axially end (axially opposite the bottom portion) to a radially outwardly extending collar 24, which in turn is radially outwardly formed into an axially upwardly extending bevel 25 of defined length. The outer radius of the bevel 25 of the first reference ring member 14 is selected so that the first reference ring member 14 is axially insertable or insertable under surface contact of the folds 16, 25 in the second reference ring member 13. In this case, the fold of the second reference ring part forms the radial outer side of the fully assembled reference ring, as in particular in the Fig. 7 is shown.

As a result, the holding or clamping feet 17 protrude radially inwards downwards in the direction of the first reference ring part 14, but without touching it. The first reference ring part 14 is axially inserted into the second reference ring part 13 under surface contact between both folds 25, 16, until the upper edge of the fold 25 of the first reference ring member 14 abuts against the inside of the annular disc 15 of the second reference ring member 13 and thus the minimum thickness (clear height ) of the thereby forming reference ring 1 defined. This mating process is in the Fig. 8 pictured. The terms "top" and "bottom" are specific to the orientation in the FIGS. 4, 5 . 7 and 8 associated lamp parts.

In the present case, the two reference ring parts 13, 14 between two axially spaced mounting receivers 26, 27th used, which can be moved towards each other, to push the two ring parts 13, 14 axially into one another. The relative position of both reference ring parts 13, 14 is chosen so that the through holes 18, 22 in the annular disc 15 and in the bottom portion 20 overlap seen in the axial direction. The two mounting seats 26, 27 are now axially moved toward each other until the fold 25 of the lower reference ring portion 14 on the annular disc 15 of the upper reference ring portion 13 strikes inside or until the mounting seats 26, 27 have reached a predefined distance from each other. In this particular defined position of the reference ring 1 has a thickness of predetermined size with a predetermined close tolerance. In this state, both ring parts are welded together, for example, by laser welding technology, in each case in the region of the abovementioned flattenings 19.

The burner 2 inserted thereafter into the finished welded reference ring 1 has a contact between the clamping feet 17 and the metal sleeve 8 surrounding the outer bulb 6, so that at a certain adjusted relative position of outer bulb 6 and reference ring 1, the clamping feet 17 with the metal sleeve 8, for example by welding (Laser welding) are firmly connected. In this case, the extension wire 12 described above protrudes through the two overlapping through holes 18, 22.

After the thus shaped burner 2 is inserted into the receiving space 9 in the housing 3 and the power supply lines 11, 12 are connected to the contacts 10, the reference ring 1 is located with its first (inner) reference ring portion 14 on the outside of the housing 3, to be fixed there, for example, by welding or crimping.

It should be noted at this point that the outer piston 6 can already be preassembled in the upper reference ring part 13 and fixed to the clamping feet 17 before the two reference ring parts 13, 14 are connected to one another. It is additionally possible that the first reference ring part 14 is already fixed to the housing 3 of the ignition electronics, before the second reference ring part 13 is fitted with external piston 6 or burner 2 pre-mounted on the lower reference ring part 14 and welded thereto.

Disclosed is therefore a high-pressure discharge lamp with a reference ring consisting of a lower ring part of a deep-drawn element and an upper ring part of a deep-drawn, are formed on the radially inwardly projecting, circumferentially spaced retaining tabs. According to the invention, the upper and the lower ring part radially outwardly axially opposite (or axially facing each other) folds each having a predefined edge height, which are joined together under peripheral surface contact and welded at least point-shaped on the outer periphery of the thereby lying outside fold.

Claims (3)

1. High-pressure discharge lamp having a reference ring (1) comprising a first sleeve-shaped ring part (14) and a second sleeve-shaped ring part (13), which are each preferably manufactured from a deep-drawn element, wherein retaining lugs (17) which protrude radially inwards and are spaced apart from one another in a circumferential direction are formed on the second ring part (13), characterized in that the first and second ring parts (13, 14) have bent-back portions (25, 16), each having a predefined axial bent edge height, which extend radially outwards axially in the opposite direction to one another, which are joined one inside the other with surface contact on the circumferential side and are at least spot-welded on the outer circumference of the bent-back portion (16) which is thus on the outside, wherein the first ring part (14) is inserted axially into the second ring part (13), and wherein the height of the bent-back portion of the first inner ring part (14) is selected such that, by virtue of the bent-back portion (25) of the first inner ring part hitting axially against the second outer ring part (13), a defined clear height is imparted to the reference ring (1).
2. High-pressure discharge lamp according to Claim 1, further characterized in that the radially outer bent-back portion (16) is formed on its circumferential side with a number of flattened portions (19) which are substantially spaced uniformly apart from one another in the circumferential direction and which define the spot-welding points.
3. High-pressure discharge lamp according to one of the preceding claims, further characterized by a housing (3) at least containing the starting electronics for the lamp, with the reference ring (1) being fixed on said housing, preferably via the first inner ring part (14) of said reference ring and preferably by means of welding or flanging.

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