DE102008009029A1 - Method for producing a discharge vessel for a discharge lamp - Google Patents

Abstract

The invention relates to a method for producing a discharge vessel (2) for a discharge lamp (1), in which a first (3) and at least a second vessel part (4) are provided and connected, both vessel parts (3, 4) being provided on Connecting portions (7, 8) are heated and the heated and softened vessel material of the vessel parts (3, 4) each pressed outwards and each outwardly facing bulge (9, 10) is generated, which bulges (9, 10) are interconnected and by a change in a gas pressure in at least one vessel part (3, 4) the connection point (11) of the bulges (9, 10) is broken.

Description

Technical area

The The invention relates to a method for producing a discharge vessel for a discharge lamp in which a first and at least one provided second vessel part and these together get connected.

State of the art

discharge lamps are known in various design and use. In this context, discharge lamps with straight tubular Discharge vessels as well as prior art, such as Such, which multiply curved discharge vessels exhibit. In this context are also discharge vessels known for discharge lamps, which consists of several parts are composed, wherein the different parts of the discharge vessel U-shaped may be formed. About that In addition, it is known that on the inside of such discharge vessels a phosphor layer is applied.

From the EP 1 282 153 A2 a discharge vessel for a discharge lamp is known, in which connection the inside of this discharge vessel is coated with a protective layer and a phosphor layer. The protective layer is mounted directly on the inside of the discharge vessel and may for example be an AlonC layer.

to Connection of vessel parts of the discharge vessel It is required in the prior art that at the junction a clean free wipe on the inside of the discharge vessel takes place so that there the protective layer is no longer present. Because just in the connection area between the vessel parts the material of the protective layer contributes to the glazing between the vessel parts jumps may occur.

There due to the geometries and configurations of the discharge vessels the free wipe only in accessible places possible This can not be done everywhere or sufficient respectively. In addition, the free wiping is at the point of attachment time-consuming and associated with a further manufacturing step. This extends the production time and over It also increases costs.

Presentation of the invention

It It is an object of the present invention to provide a method for manufacturing a discharge vessel to create, in the vessel parts of the discharge vessel simple and little effort can be connected. This should especially before the Background allows that to the most diverse Junctions prevents the occurrence of material jumps can be.

These The object is achieved by a method which has the features according to claim 1, solved.

at the inventive method for manufacturing a discharge vessel for a discharge lamp become a first and at least a second vessel part provided and connected with each other. Both vessel parts are heated at intended connection areas and the heated and softened vessel material the vessel parts are each outward pressed and it is always an outward facing Bulge generated. The bulges are linked together and by changing a gas pressure in at least a vessel part becomes the junction of the bulges breached. It is thereby a coherent discharge vessel easy and produced with little effort and through the connection thus created can Material jumps can be prevented at the connection point.

Preferably becomes an increase in a vessel part the gas pressure carried to the junction of the Bulges to break. In such a pressure surge can the heated and softened vessel material in the field of bulging simple yet very precise be torn open, leaving a continuous connection in shape a channel-like connection with the other part of the vessel can be guaranteed. This is especially true advantageous in that the joint is more robust towards Material jumps can be made.

It can also be provided that in a vessel part a reduction of the gas pressure is performed to the Break the junction of the bulges. Optional to Increase over a gas pressure, as with The production of a bulge has been set by a Humiliation and therefore one thing compared to the previous one vacuum created a breakthrough and tearing the bulges are made possible at the junction. This also creates a guideline which is more robust Joint ensures and material jumps can be reduced.

Preferably, the bulges are interconnected prior to varying the gas pressure to produce the breach at the juncture of the bulges. Precisely because of this, it is particularly easy and low-effort ensured that the connection allows targeted who the can and the opening is made very precise.

Preferably is used to create a bulge in a vessel part the outside is heated at the intended connection area and inside the vessel part an increase the gas pressure generated. In particular, at least one generated Bulge before and / or during connection to the other bulge further heated, especially on the outside heated in the middle. By this procedure, the opening subsequently improved by generating a pressure change respectively. Especially with regard to unwanted material dilutions and in turn, if necessary, resulting material jumps By this procedure, a particularly suitable procedure be created.

Preferably is after connecting the heated bulges in one Vessel part an increase in gas pressure performed and in the other part of the vessel becomes a lowering of the gas pressure to break the joint the bulges generated. This is a particularly advantageous procedure because in both vessel parts pressurizations take place, which entgegenge sets are directed, causing the breaking of the Joint particularly accurate and in terms of avoidance of material jumps after cooling of the composite Discharge vessel can be enabled.

Especially are the insides of the vessel parts before joining coated with a protective layer, in particular AlonC. additionally is preferably a phosphor layer on the inside of the vessel parts appropriate.

Just then, when such a protective layer is applied is through the procedure according to the invention for manufacturing a discharge vessel ensures that such a protective layer-free glazing allows in the connection area which, in the prior art for material jumps essentially responsible protective layer there no longer exists is. A free wipe before connecting the vessel parts at the junction and thus an explicit removal of Protective layer at this connection point is no longer necessary. By the illustrated inventive Namely, the procedure can be guaranteed that there is a protective layer enclosure prevented can. The free-wiping is independent of the shape and geometry the vessel parts at the junction through the inventive method no longer required and it can also be achieved without such free-wiping that creates the junction without protective layer inclusion can be.

About that In addition, a fast expiration of the bonding and the hole blowing or creating the breakthrough at the junction of the bulges be enabled and these operations in the same Production position of the discharge vessel performed become. In addition, by the invention is a relative provided a simple method, which is a relatively small requires technical effort for production. Last but not least thereby also minimizing mercury consumption of the lamp be achieved because the protective layer is no longer removed.

Especially is the change in gas pressure to break through the Junction of the bulges for a period of time a few milliseconds. Furthermore It is especially advantageous if the change in gas pressure is generated minimally, so that strong pressure surges be avoided. This can cause unwanted tearing or undesired blowing away of the softened vessel material be prevented.

Especially is the gas located in the vessel parts which In the pressure is changed to the junction of the bulges tearing open in this stage of production of the discharge vessel Air in it. It can also be provided that this Ambient air already specific other gases are added.

Brief description of the drawings

One Embodiment of the invention will be described below schematic drawings explained in more detail. It demonstrate:

1 a perspective view of a discharge lamp produced by a method according to the invention;

2 a schematic representation of a first state of manufacture of the discharge vessel;

3 a schematic representation of a second state of manufacture of the discharge vessel

4 a schematic representation of a third state of manufacture of the discharge vessel of the discharge lamp.

Preferred embodiment the invention

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

In 1 is a perspective view of an embodiment of a discharge lamp 1 shown, which is designed as a compact fluorescent lamp. The discharge lamp 1 includes a discharge vessel 2 which is a first vessel part 3 and a second vessel part 4 having. The two vessel parts 3 and 4 are designed as U-shaped tubes, which are interconnected, so that a common contiguous discharge space in the interior of the vessel parts 3 and 4 is trained.

The embodiment of the discharge vessel 2 and the shape and geometry of the vessel parts 3 and 4 is merely exemplary and may be provided in other embodiment.

The two vessel parts 3 and 4 are through a connecting bridge 5 connected with each other.

In addition, the discharge lamp includes 1 a housing 6 into which the discharge vessel 2 extends and in which a control gear for the discharge lamp 1 can be provided and arranged.

The production of the discharge vessel 2 will be explained below using the next 2 to 4 explained in more detail.

In 2 a manufacturing stage is shown in which the two vessel parts 3 and 4 be provided separately and separately from each other, wherein the inner sides of the vessel parts 3 and 4 with a protective layer, in particular an AlonC layer, and a phosphor layer are coated.

At one on the second vessel part 4 provided connection point 7 of the vessel part 3 becomes the glass material of the vessel part 3 heated on the outside. In a corresponding manner, a heating of the glass material of the second vessel part 4 on the outside in the area of the vessel part 3 provided connection point 8th carried out. At the same time in both vessel parts 3 and 4 generates a pressure of the gas therein, which is so large that the softened glass material at the joints 7 and 8th bulges outward and each bulge 9 and 10 at the vessel parts 3 and 4 be generated.

According to a subsequent stage of the method, as shown in FIG 3 a joining of the bulges 9 and 10 and thus directly contacting them and performing a connection 11 generated. This can be done either by the vessel parts 3 and 4 be moved towards each other or that these starting from the representation in 2 be arranged in a position defined there relatively close to each other and the bulges 9 and 10 be generated so large that they touch each other automatically.

Before directly connecting the bulges 9 and 10 the vessel parts 3 and 4 is based on the representation in 2 in which the bulges 9 and 10 already at least partially formed, on the outside a further heating of the bulges 9 and 10 carried out. This is preferably done so that these bulges 9 and 10 be heated in the middle and thus in the area of its largest elevation to the outside. This allows a better connection and a subsequent easier break through the bulges 9 and 10 for the production of the continuous web 5 ,

Starting from the manufacturing stage in 3 then becomes inside the first vessel part 3 carried out an increase in the local gas pressure and at the same time in the interior of the second vessel part 4 a reduction of the local gas pressure carried out. The pressure increase on the one hand and the pressure reduction on the other hand is generated for a relatively short period of time, in particular a few milliseconds. By such a pressure change in the vessel parts 3 and 4 will break the bulges 9 and 10 and thus reached the contacted softened glass material and a continuous tubular web 5 produced. By doing so, it can be achieved that the two Entladungsge vessels 3 and 4 be connected without an inclusion of the material of the protective layer would take place at the connection training. As a result, the occurrence of jumps in material caused by the protective layer in the region of the web can occur 5 be avoided. A clearing of the insides of the vessel parts 3 and 4 in the area of joints 7 and 8th is thus before generating the bulges 9 and 10 and the subsequent connection as shown in FIG 3 and 4 not necessary anymore. The free wipe is thus limited only to the areas in which the vessel parts 3 and 4 be squeezed before the gas-tight fusion, especially in the areas where the electrodes from the outside into the interior of at least one vessel part 3 or 4 extend.

The position and representations of the vessel parts 3 and 4 in the 2 to 4 is merely to be understood symbolically, the basic arrangement in the actual design is by the finished discharge lamp 1 as shown in 1 shown. The vessel parts 3 and 4 with their U-shaped design are virtually positioned side by side or parallel to each other.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - EP 1282153 A2 [0003]

Claims (9)

Method for producing a discharge vessel ( 2 ) for a discharge lamp ( 1 ), in which a first ( 3 ) and at least one second vessel part ( 4 ) and these are connected, characterized in that both vessel parts ( 3 . 4 ) at intended connection areas ( 7 . 8th ) and the heated and softened vessel material of the vessel parts ( 3 . 4 ) in each case pressed outwards and in each case an outwardly facing bulge ( 9 . 10 ), which bulges ( 9 . 10 ) and by a change of a gas pressure in at least one vessel part ( 3 . 4 ) the connection point ( 11 ) of the bulges ( 9 . 10 ) is broken. Method according to claim 1, characterized in that in a vessel part ( 3 . 4 ) an increase of the gas pressure is performed to the junction ( 11 ) of the bulges ( 9 . 10 ) break through. Method according to claim 1 or 2, characterized in that in a vessel part ( 3 . 4 ) a reduction of the gas pressure is carried out to the junction ( 11 ) of the bulges ( 9 . 10 ) break through. Method according to one of the preceding claims, characterized in that the bulges ( 9 . 10 ) before changing the gas pressure to produce the breakthrough at the junction ( 11 ) of the bulges ( 9 . 10 ). Method according to one of the preceding claims, characterized in that for producing a bulge ( 9 . 10 ) in a vessel part ( 3 . 4 ) the outside at the intended connection area ( 7 . 8th ) is heated and inside the vessel part ( 3 . 4 ) an increase of the gas pressure is generated. Method according to claim 5, characterized in that at least one generated bulge ( 9 . 10 ) before and / or during connection to the other bulge ( 9 . 10 ) further heated, in particular centrally heated outside, is. Method according to one of the preceding claims, characterized in that after joining the heated bulges ( 9 . 10 ) in a vessel part ( 3 . 4 ) an increase of the gas pressure and in the other vessel part ( 3 . 4 ) a lowering of the gas pressure to break the joint ( 11 ) of the bulges ( 9 . 10 ) is produced. Method according to one of the preceding claims, characterized in that the insides of the vessel parts ( 3 . 4 ) are coated prior to bonding with a protective layer, in particular an AlonC layer. Method according to one of the preceding claims, characterized in that the change of the gas pressure performed for a period of a few milliseconds becomes.