WO2011051049A1

WO2011051049A1 - Blow-out protected lamp

Info

Publication number: WO2011051049A1
Application number: PCT/EP2010/063458
Authority: WO
Inventors: Ludger Wilken; Uwe Fidler
Original assignee: Osram Gesellschaft mit beschränkter Haftung
Priority date: 2009-10-30
Filing date: 2010-09-14
Publication date: 2011-05-05
Also published as: DE112010004167A5; DE102009051537A1

Abstract

The invention relates to a lamp having an outer bulb comprising regions having varying wall thickness. For a lamp power of 70 W and less, the neck region has a wall thickness of 1.5 mm at maximum, preferably of 0.8 to 1.1 mm, and a second region has a wall thickness of at least 1.7 mm and for a lamp power greater than 70 W, the neck region has a wall thickness of up to 2.0 mm at maximum, preferably of 1.0 to 1.3 mm, and a second region has a wall thickness of at least 2.2.

Description

Title: Platzer-protected lamp

Technical area

The invention relates to a space-protected lamp according to the preamble of claim 1.

State of the art

So far, the Platzerschutz is ensured by the so-called Shroud technique, see for example WO 2007/122522. Here, a thick-walled glass tube is arranged around the burner that is closed on both sides with metal caps and hereby also connected to the frame. When the burner bursts, the fast burner components are decelerated by this shroud and fall into the outer bulb, which is also created so that no glass stresses are generated by the hot, now slow burner components. Glass stresses that would cause breakage of the outer envelope are avoided by a suitable glass such as borosilicate glass. A disadvantage of this design is the complex and therefore expensive frame with the Shroud.

DE 103 36 282 describes a lamp in which the burner is surrounded by two pistons, namely an inner evacuated piston and an outer thick-walled piston made of hard glass (Duranglas), which is filled with air and the bursting of the burner and the inner piston the still fast and hot components stops and is not destroyed, whereby the Platzerschutz is guaranteed. This modular lamp has the disadvantage that the individual components, for example the outer bulb due to the construction, must be made very accurately, and thus relatively expensive.

Presentation of the invention

It is the object of the present invention to provide a lamp according to the preamble of claim 1, wherein in a cost-effective manner a Platzerschutz is made possible.

This object is achieved by the characterizing features of claim 1.

Particularly advantageous embodiments can be found in the dependent claims.

It is the object of the present invention to provide a lamp which prevents bursting of the hot burner components upon bursting of the burner by not breaking the outer bulb or unprotected parts of the outer bulb upon bursting of the burner, thus leaving the hot burner components in the lamp. In several embodiments, the function of this lamp will be explained.

One embodiment is a halogen lamp which is under high pressure during operation and may burst. A second embodiment is a

High pressure discharge lamp with a quartz or ceramic torch with a metal halide filling or amalgam filling that may burst during operation. It has an outer bulb, preferably made of tempered glass

(Tungsten melamine glass, borosilicate glass, aluminum silicate glass), soft glass (soda glass) or quartz glass can also be used with a Variation of the wall thickness, wherein the smaller wall thickness is in the Einschmelzbereich and is selected so that a fusion of the outer bulb with a cup base, which supports a frame for the burner, is possible. The outer bulb has at least a second larger wall thickness in the piston area, which is chosen so that when bursting the burner, the outer bulb is not destroyed. Usually, the outer bulb is equipped with a classic screw base or in particular for higher lamp powers an extended screw base which is fixed at a position on the outer bulb, where it has a relatively large wall thickness, and thus ensures that although the outer bulb in the region of the melt with small wall thickness can burst, but this area is surrounded by a cover. This cover is advantageous in particular an extended screw base, whereby the Platzerschutz is ensured, or it is a housing for electronics with an attached thereto screw base.

The space-protected lamp may be a metal halide lamp, a high pressure sodium vapor lamp, particularly high xenon pressure, eg 2 bar, a metal halide high pressure discharge lamp or other high pressure discharge lamp with a ceramic or quartz torch with a metal halide fill or amalgam fill with a screw base, an extended screw base or a housing for electronics with a screw base, which is operated directly on the mains voltage or on the magnetic or electronic ballast. This lamp should be one Have outer bulb with areas of different wall thickness. In the area of melting or crushing with the smaller wall thickness, the wall thickness should be such that the outer bulb can be fused with the foot or the outer bulb can be squeezed into this area. In the remaining area of the outer bulb, a larger wall thickness is chosen, in such a way that when the burner bursts, the outer bulb remains intact. By way of example, in the case of a lamp with a metal halide ceramic burner operated at a power of 70 W, a wall thickness of at most 1.5 mm in the fusing area, the foot fuses with the outer bulb, and a wall thickness of At least 1.7 mm in the remaining area of the outer bulb, the Platzerschutz be ensured.

With increasing lamp power, greater than 70 W, the pistons generally become larger and have a greater wall thickness in the melting range of a maximum of 2.0 mm. In the same way but also increases with the power of the momentum of the burner components when bursting, which at higher lamp power, the wall thickness of the outer bulb to ensure the Platzerschutzes must also be greater, so should be at least 2.2 mm. In practice, this wall thickness may well be 3 mm and more. Overall, the wall thickness in the melting zone is always significantly smaller than the wall thickness in the remaining area of the outer bulb for both power ranges.

For the outer bulb is the use of mechanically and thermally stable hard glass, eg borosilicate glass (tungsten Einschmelzglas, Schott 8487, 8486 or Telux glass 410) aluminum silicate glass of advantage. Because of the thick-walled glass and operating temperatures on the glass wall of well below 500 ° C and soft glasses, such as soda glasses, eg soda lime magnesia glass, alkaline earth alkali silicate glass (EMGO Glass 360 C, Schott AR glass) can be used ,

Basically, the melting range is a weak point in the outer bulb, which can be protected by a cover. By using an extended screw base, e.g. with a sleeve of metal, e.g. made of aluminum, which may be constructed so as to be insulated against external voltages, or made of a plastic, e.g. PBT, and the attachment of this extended screw base outside the thin Einschmelzbereiches is achieved that the outer bulb in the sensitive area of the meltdown can be destroyed. But because of the surrounding extended screw base, the hot burner components can not escape from the lamp, thus the Platzerschutz is ensured.

Similarly, the housing for electronics may also be attached to the outer bulb at a location outside the sensitive fusing area, whereby this sensitive area may burst, leaving the hot components but then in the electronics housing, thus also providing burst protection is.

It is also possible to attach a disc of mica to the two electrode wires or a disc of metal, eg aluminum over the glass base, whereby the fast burner components are either slowed down or even stopped, thus protecting the sensitive meltdown area and preventing bursting of the outer envelope. A basic embodiment of an outer bulb is a bulbous or tubular shape, spherical or elliptical above, each with a neck portion for sealing. It is essential here that the wall thickness for lamp powers of not more than 70 W in the region of the neck portion is 0.5 to 1.5 mm, preferably 0.8 to 1.2 mm. By contrast, the wall thickness in the area of the bulbous shape or tubular shape is at least 1.7 mm. The transition takes place in all forms as close as possible and quickly after the neck part. Similarly, for lamps having powers greater than 70 W, the wall thicknesses in the region of the neck portion are 0.5 to 2.0 mm, preferably 0.9 mm to 1.5 mm, and in the area of the bulbous or tubular form at least 2, 2 mm.

In a preferred embodiment, the outer bulb is bulbous. The wall thickness is also differentiated within the bulbous part. In this case, it is relatively small in a region close to the neck, which is convexly curved. At the point of inflection and a surrounding area it is larger, in the area of the maximum diameter it is again larger and in the dome area it can be largest. The increase in wall thickness from the thin fusing area to the thicker remaining area of the outer envelope is preferably in a range of 1 mm over a path length of 10 mm. Because of the thick-walled outer bulb, lamps that are protected by light have a much greater weight and therefore a higher price than lamps that are not protected against space. In order to keep the weight and thus the price as small as possible, the minimum wall thickness outside the melting range should be as small as possible. For this solution of this optimization task the space-protected lamps are tested. For this, the American National Standard ANSI C78.387e-2003 can be used. In this test equipment and evaluation conditions for the test of space-protected lamps are specified, for lamps with quartz glass burners Annex A and for lamps with ceramic burners Annex B is used. All in all, it should be noted that due to the greater hardness and the same burner wall thickness and the same power, lamps with ceramic burners require an outer bulb with a larger minimum wall thickness, approx. 0.4 mm more, outside the melting range than lamps with quartz glass burners.

Likewise, two conditions can be distinguished in these burst tests and their evaluation. At the first condition, the lamps pass the test just like that and under the tightened condition all lamps pass this test very surely. The difference is that in order to meet the more stringent conditions, the minimum wall thickness of the outer bulb outside the fusing area must be greater by about 0.6 mm than in the weaker test condition. Brief description of the drawings

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

1 shows a first embodiment of a lamp with a tubular outer bulb.

2 shows a second embodiment of a lamp with a tubular outer bulb.

Fig. 3 shows an embodiment of a lamp bulbous

Outer bulb;

4 shows a further embodiment of a lamp with bulged outer bulb with attached Tellerfuß.

Fig. 5 shows an embodiment of a lamp with

Screw base;

Fig. 6 shows an embodiment of a lamp with a tubular piston with an extended screw base;

Figure 7 shows another embodiment.

Preferred embodiment of the invention

Figure 1 shows a first embodiment of a high pressure discharge lamp 1 with a power of 70 W. It has a tubular outer piston 2, which is closed at one end by a pinch seal 3. At the pinch a socket 4 surrounds this end. The second end is closed by a dome 5. Inside sits axially a discharge vessel made of quartz glass 6, which through a Frame 7 with a short (7a) and long power supply (7b) is supported. The outer bulb 2 is made of quartz glass because of the high bulb wall temperature. The wall thickness is differentiated (not shown). In the region of the pinch 3, it is the thinnest, in a region H, which is still protected by a cover 10 of the base. Here the wall thickness is about 0.9 to 1.1 mm. This is followed by a transition region U, which extends approximately to the lower end of the discharge vessel 6. Here, the wall thickness increases continuously. This is followed by a region A, in which the wall thickness is at least 1.7 mm. This area extends here to dome 5. To fulfill the simple bursting test, the wall thickness should preferably be at least 2.0 mm and for safe performance of the burst test without damage at least 2.5 mm. The region A means the part of the outer bulb, which comprises the largest part of the tube and possibly also the dome.

It is possible to produce the thick-walled outer bulb in Fig. 1 so that a second tube is pushed onto the original tube before or after melting, the inner diameter is only slightly larger than the outer diameter of the inner tube and its length is approximately the length of Brenners corresponds, and which is then fused with the inner tube at the ends.

Figure 2 shows another embodiment with similar outer bulb, but here is the discharge vessel 16 is a ceramic burner. Since such discharge vessels burst with greater momentum, other dimensions of the outer bulb should be used here become. A guideline is a 20% larger wall thickness.

Figure 3 shows the precursor of a bulbous outer bulb for a lamp with 70 W and a burner made of ceramic borosilicate glass, which certainly the burst test according to ANSI C78.387e-2003, Annex B. He is intended for a plate smelting. It is divided into a neck region 11 and a bulbous region 12. The wall thickness H in the neck region is 1.0 to 1.15 mm here. This is followed by a transition region U to the region of maximum diameter of the outer bulb, which has a wall thickness U of at least 2 mm from the inflection point WP of the transition between the neck and stomach. In the area of the maximum diameter (AI), the wall thickness is at least 3 mm. Since the dome area is the most endangered, the wall thickness A2 should be at least 3 mm here. This value refers to the vertex.

Figure 4 shows a complete lamp 20, wherein the bulbous outer bulb 12 of FIG. 3 with

Plate refining 13 is used. It uses a 70 W ceramic torch with metal halide filling and an argon ignition gas.

In this lamp, a wall thickness of 0.8 mm to 1.3 mm is present after melting in the melting or neck area H, on average 1.1 mm. This is followed by a transition region in which the wall thickness U is about 1.8 to 2.2 mm. This area is almost still axially parallel to the longitudinal axis AX of the outer bulb. Until the turning point WP, the wall thickness increases to at least 3.0 mm too. It then remains approximately constant in the area of the remaining bulbous form. This is especially true for the

Range of maximum diameter (for AI) and apex (A2). This lamp (Fig. 4) fulfills the burst test after

ANSI C78.387e-2003 in a safe manner, which is characterized by the fact that after the burst test most of the lamps tested are still vacuum tight.

This lamp has a diameter of 65 mm and a length of 90 mm and a weight of about 110 g, which is comparable to the weight of a space-protected lamp in Shroud technology or in modular design. To reduce the weight, it is possible to reduce the wall thickness in the side and dome area by up to 0.6 mm to at least 2.4 mm, which, however, fulfills the burst test according to the ANSI C78.387e-2003 no longer absolutely reliable would become.

In the case of a 150 W lamp 20 with a ceramic burner 25 according to FIG. 5, 1.3 mm is selected as the wall thickness in the fusing zone. To generate a good vacuum, a getter 21 is used in the outer bulb. In order to reduce the luminance and to prevent glare, a litter layer 24, e.g. from Aerosil or cipernate introduced. An E27 screw base 26 is attached to the outer bulb 12 with a putty.

The minimum wall thickness at which the burst test is just passed is 2.7 mm, and the wall thickness at which the burst test passes without significant damage to the outer bulb is 3.3 mm. At even higher wattages, the wall thickness can be even higher at all values to get voted. In particular, it can be selected at the points AI and A2 between 3.5 and 4 mm. In the area of the inflection point 2.2 to 2.5 mm are useful, in the transition region U about 2.0 to 2.4 mm. In the neck area H, the preferred value is 1.5 mm. It should not be exceeded 2.0 mm. Here, however, that with increasing wall thickness in the neck of the

Melting area is less at risk of bursting.

In the case of the complete lamp according to FIG. 5, the ceramic discharge vessel is seated obliquely to the lamp axis AX in the bulbous outer bulb. The frame 7, which supports the discharge vessel 25, is fixed in the plate base 28. The wall thickness of the outer envelope is not shown to scale. In order to protect the thinner areas of the outer bulb suitable, the cover 29, which may contain, for example, a ballast or ignitor, pulled up to a maximum about the inflection point of the bulbous outer bulb. To protect the meltdown a known mica flakes 30 is supported on the frame. At the end of the cover sits a known screw base.

For a 35 W lamp, for example, the wall thickness of 1.0 mm in the fusing area and the minimum wall thickness at which the burst test is just passed can be set to 2.1 mm and the minimum wall thickness at which the burst test is passed is 2.7 mm become. In the transition area, the mean values of 1.5 to 1.9 mm are selected accordingly. For smaller lamp power, the wall thickness can be further reduced. Is at the same time with the usually shorter burner, the lamp length and the diameter of the outer bulb is reduced, it is possible to reduce the weight of the lamp further, so that you get a weight of 70 g or less, for example, in a lamp with a 20 W ceramic burner. Overall, a complicated separate protective device is avoided with such an outer bulb with differentiated wall thickness.

Preferably, the outer bulb is evacuated, wherein a getter is still housed in the outer bulb.

Other preferred embodiments include the following features:

Above the foot in the area of the electrode wires there is a mica disk, which can stop fast burner components, which are flying in the direction of the base, and thus protect the slightly weaker meltdown area.

Similarly, an aluminum disc can be pushed over the glass base, which also provides additional protection for the fusing area. FIG. 6 shows a further exemplary embodiment of a lamp 40 with a normal screw base 45.

In a specific embodiment, a special E27 screw base is provided, which is in the upper region, for example with a cylinder or a cone of an insulating material such as PBT, or of a metal such as aluminum, which may have an insulating layer made of a plastic material or one Alumina layer may exist, so that the electrical contactor is ensured.

At the turning point of a bulbous outer bulb, the wall thickness is preferably approximately the average of the values for H and Al. In particular, the actual value should not deviate more than 20% from this mean.

FIG. 7 shows a complete 100 W lamp 40 with a ceramic burner 39 and a tubular outer bulb 41 in plate smelting. Preferably, the outer bulb 41 is evacuated, wherein still a getter 21 is housed in the outer bulb. Above the foot in the area of the electrode wires is a mica disk 30. This can stop fast burner components flying in the direction of the socket and thus protect the slightly weaker meltdown area.

Similarly, an aluminum disc can be pushed over the glass base, which also provides additional protection for the fusing area. In the embodiment shown, a special E27 screw base 45 is attached. This is extended with a cover 46 in the way that it extends into the region of the thick-walled outer bulb and is fixed there in the usual way with a putty or an adhesive on the outer bulb. If the weak meltdown area should break when the burner bursts, the hot burner components remain inside the special E27 socket with extension part. In the upper part of the extended screw base is an insulating material 47, such as Teflon, on the surface, which overlaps the metallic screw thread slightly and thus ensures the contact protection. Similarly, it is possible to realize this contact protection, for example, with a cylinder or a cone of an insulating material such as PBT, or of a metal, for example aluminum, which may have an insulating layer, which consists for example of a plastic material or an aluminum oxide layer ,

Essential features of the invention in the form of a numbered list are:

1. An electric lamp having a longitudinal axis, wherein an internal burner of ceramic and quartz glass is surrounded by a closed on one side outer bulb, which is sealed at the first end with a seal, contains a getter and is closed at the second end with a dome, characterized in that the outer bulb is subdivided into a neck region which adjoins the meltdown and a second region which surrounds the discharge vessel, the wall thickness of the neck region being smaller than the wall thickness of the second by at least 0.2 mm

Area.

2. Electric lamp according to claim 1, characterized in that for lamps with powers of 70 W and less the wall thickness of the neck region maximum 1.5 mm, preferably 0.8 to 1.2 mm and the wall thickness of the second area is at least 1.7 mm.

Electric lamp according to claim 1, characterized in that for lamps with powers of more than 70 W, the wall thickness of the neck region is a maximum of 2 mm, preferably 1.0 to 1.3 mm and the wall thickness of the second region at least 2.2 mm is located.

An electric lamp according to claim 1, characterized in that the wall thickness change between the neck region and the surrounding second region within an axial path length of 20 mm, preferably within 10 mm takes place.

Electric lamp according to claim 1, characterized in that the second part of the

Outer bulb is tubular.

Outer bulb is bulbous, with a maximum diameter, apex and a subsequent to the neck area transition area.

Electric lamp according to claim 4, characterized in that the wall thickness in

Transition region is 0.3 to 0.5 mm larger than in the neck area. Electric lamp according to claim 4, characterized in that between transition region and maximum diameter is a turning point, in which the wall thickness is at least 0.3 mm larger than in the neck region.

9. An electric lamp according to claim 4, characterized in that the wall thickness at the point of maximum diameter is at least 0.6 mm larger than in the neck region. 10. An electric lamp according to claim 4, characterized in that the wall thickness in the region of the maximum diameter to the apex is at least 3 mm.

11. Electric lamp according to claim 1, characterized in that the outer bulb made of tempered glass,

Quartz glass or soft glass is made.

12. An electric lamp according to claim 1, characterized in that the neck region is surrounded on the outside by a cover attached to the base. 13. An electric lamp according to claim 1, characterized in that the melt is formed by a pinch or a plate smelting.

Claims

claims

1. An electric lamp having a longitudinal axis, wherein an internal burner of ceramic and quartz glass is surrounded by a closed on one side outer bulb, which is sealed at the first end with a seal, contains a getter and is closed at the second end with a dome, characterized in that the outer bulb is subdivided into a neck region which adjoins the meltdown and a second region which surrounds the discharge vessel, wherein the

Wall thickness of the neck area is at least 0.2 mm smaller than the wall thickness of the second area.

2. Electric lamp according to claim 1, characterized in that for lamps with powers of

70 W and less the wall thickness of the neck region is a maximum of 1.5 mm, preferably 0.8 to 1.2 mm and the wall thickness of the second region is at least 1.7 mm. 3. Electric lamp according to claim 1, characterized in that for lamps with powers of more than 70 W, the wall thickness of the neck region is a maximum of 2 mm, preferably 1.0 to 1.3 mm and the wall thickness of the second region at least 2 , 2 mm.

4. An electric lamp according to claim 1, characterized in that the wall thickness change between the neck region and the surrounding second Range within an axial path length of 20 mm, preferably within 10 mm occurs.

5. Electric lamp according to claim 1, characterized in that the second part of the

Outer bulb is tubular.

7. Electric lamp according to claim 4, characterized in that the wall thickness in

Transition region is 0.3 to 0.5 mm larger than in the neck area.

Electric lamp according to claim 4, characterized in that between transition region and maximum diameter is a turning point, in which the wall thickness is at least 0.3 mm larger than in the neck region. 9. An electric lamp according to claim 4, characterized in that the wall thickness at the point of maximum diameter is at least 0.6 mm larger than in the neck region.

10. An electric lamp according to claim 4, characterized in that the wall thickness in the region of the maximum diameter to the apex is at least 3 mm.

11. Electric lamp according to claim 1, characterized in that the outer bulb is made of tempered glass, quartz glass or soft glass.

12. An electric lamp according to claim 1, characterized in that the neck area is surrounded on the outside by a cover.

An electric lamp according to claim 1, characterized in that the melting is formed by a pinch or by a plate smelting.