WO2007090771A1

WO2007090771A1 - Reflector lamp with anti-burst tube

Info

Publication number: WO2007090771A1
Application number: PCT/EP2007/050932
Authority: WO
Inventors: Joachim Arndt; Markus Herb; Uwe Fidler; Matthias Lenz
Original assignee: Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH
Priority date: 2006-02-09
Filing date: 2007-01-31
Publication date: 2007-08-16
Also published as: DE102006006063A1

Abstract

The light unit has a light source which is surrounded by a bulging anti-burst tube. In said lamp a metal cap can be fitted directly onto the tube without an aid.

Description

REFLECTOR LAMP WITH OVERHEAD TUBE

Technical area

The invention is based on a reflector-carrying light unit according to the preamble of claim 1. It is in particular a reflector lamp or a lamp equipped with a reflector. The light source therein is in particular a high-pressure discharge lamp, but also an incandescent lamp is suitable for this purpose. The invention further relates to a structural unit for use in such a reflective light unit.

State of the art

From WO 2004/046609 a light unit is known, with a concave reflector and a light source, which is designed as a high-pressure discharge lamp. In this case, a glare protection for the light source is mounted on a Burstschutzrohr surrounding the light source. For this purpose, the Berstschutzrohr a circumferential dent, in which the helmet-shaped glare protection is anchored.

A disadvantage of this holder is that the Berstschutzrohr must be elaborately pretreated to create the anchoring option, and that the glare protection must be equipped with an extra mechanism for anchoring.

From DE-A 103 36 282 a further light unit is known in which a protective tube is anchored to the ceramic base.

Presentation of the invention

The object of the present invention is to provide a light unit according to the preamble of claim 1, which is easy to assemble and is well suited for automation. This object is achieved by the characterizing features of claim 1.

Particularly advantageous embodiments can be found in the dependent claims.

Specifically, it is a light unit having a concave reflector with an exit opening and an axis, wherein the reflector surrounds an axially elongated light source, wherein the light source is spaced from a protective tube with an open and a closed end is surrounded. the light unit is in particular a reflector lamp or reflector lamp. Preferably, the light source is a metal halide lamp, more preferably the discharge vessel is made of ceramic.

Such light sources are often reflector lamps with metal halide and ceramic discharge vessel. Most of these light sources are operated without covering the outlet opening. It had to be so-called open lights. As a reflector, an aluminum reflector is often used.

These Lichteinehiten, especially these reflector lamps must therefore be designed to be protected, so that when bursting the light unit, the ingredients (filling) of the discharge vessel are retained.

An additional advantageous aspect of the invention is to prevent the direct view of the discharge vessel in a simple manner. Especially in the case of ceramic discharge vessels, which moreover often have capillaries at the ends, the discharge vessels are subjected to very high thermal loads, in particular in the case of small-wattage types up to 150 W power.

It is known to use a cylindrical protective tube and an anti-glare cap set thereon. The cylindrical protective tube is attached to the base. The protective tube, the base and the anti-glare cap envelop the light source with a certain difference volume. This little one Difference volume leads to a heat accumulation and thus causes a temperature load, which is particularly critical in ceramic discharge vessels, where the increase in temperature primarily affects the function of the capillaries in comparison to normal operation without reflector and thermowell. Another disadvantage is that the base lamp facing side of a metallic glare protection radiates back to the capillary.

The light source is preferably designed as a so-called base lamp. This means that a discharge vessel is surrounded by an outer bulb.

As Platzerschutz a glass tube is slipped over the light source according to the invention. To vergörßem the difference volume, it is not designed as a tube with a constant diameter, but as bulbous tube.

This circumstance can be used to particular advantage to attach an anti-glare cap directly on the suitably bulged tube. For this purpose, the tube has a waist.

On the end of the glass tube, which may be open or closed, a cap made of metal, preferably aluminum, attached. The cap also serves as glare protection by being dimensioned so that you can not look directly into the discharge vessel. A reduction of the temperature at the upper end of the discharge vessel, in particular the Kapillartemperaturen reflector lamps, is achieved on the one hand by matting the surface of the metallic anti-glare.

Advantageously, the tube has a second bulge to the waist, which is dimensioned so that on the one hand, the difference in volume is as large as possible and on the other optimally supports the glare protection.

Furthermore, the outer bulb of the base lamp is advantageously filled with a good heat-conductive gas, for example nitrogen, in order to remove the heat from the - A -

Ends of the discharge vessel, in particular capillaries, to improve the wall of the outer bulb of the base lamp.

These measures for reducing the heat load of the light source, in particular the capillary temperature, can be further optimized in order to ensure a superior lifetime of Lichtienheit, especially the lamp. The technical requirements Burst protection and glare protection are realized by a specially shaped outer bulb with two bellies. Here, the difference volume is significantly increased.

In particular, instead of a metal cap, the glare protection simply forms a matting, e.g. achieved by sandblasting, or a coating, e.g. with a semi-transparent ceramic color, or a light-tight

Coating, e.g. a Verspiegelungen, in the upper, the outlet opening facing the region of the outer bulb. Due to the semi-transparent

Glare protection is a further temperature reduction at the ends, preferably as capillaries asugeführt expected. The function as

Burst protection must be ensured by a suitable wall thickness of at least 1.4 mm, preferably at least 1.6 mm.

The elimination of the anti-glare cap plus mounting material simplifies the manufacture, since an assembly process is eliminated.

Preferably, the diameter of the cylindrical portion of the tube is 5 to 20% greater than the maximum diameter of the closure member. In this case, the connection between the two parts is produced in particular by a stepped shoulder. The maximum diameter of the one belly is preferably at least 30 to 50% larger than the diameter of the cylindrical section. The maximum diameter of any second belly is again preferably at least 20% greater than that of the first belly.

One field of application is, in particular, reflector lamps based on metal halide lamps, which are particularly compact. As the material of the outer bulb, any conventional glass can be used, ie in particular hard glass, Vycor or quartz glass. The choice of filling is subject to no particular restriction.

Brief description of the drawings

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

Figure 1 is a side view of a reflector lamp in section;

Figure 2 is a perspective view of a reflector lamp with cap;

Figure 3 shows another embodiment of a reflector lamp in the Schmitt;

Figure 4 shows another embodiment of a protective tube;

Figure 5 shows the side view of another reflector lamp in section;

Figure 6 is a perspective view of a protective tube with open ends.

Preferred embodiment of the invention

In Fig. 1, a reflector lamp 1 is shown with an inner vessel or base lamp 2, consisting of a discharge vessel 3, which is surrounded by an outer bulb 14. The discharge vessel is made of PCA ceramic and has two capillaries at both ends. The inner vessel 2 is seated in a central opening of a base 4. The inner vessel 2 is at a distance surrounded by a Burstschutzrohr 5, which is designed basically cylindrical and aligned parallel to the axis. The Berstschutzrohr 5 itself is in turn surrounded by a reflector 6 made of aluminum. The reflector has a neck 7 and a contour 8. The diameter of the sheath is advantageously adapted from the outside to the diameter of the bursting protection tube. Both parts are placed on the base 4, where there are several known techniques. However, the type of attachment is not important here.

The Burstschutzrohr 5 has a diameter which is closely adapted to the outer diameter of the outer bulb substantially. this is especially true in the neck rich. However, the tube 5 is closed at the outlet opening with a dome 10 which is closely fitted to the adjacent end of the outer bulb. the tube also has a first narrow belly 12, which is located at the level of the first end of the discharge vessel. It also has a waist 13, which is located at the level of the first capillary. Below this, the tube 5 again has a second belly whose diameter is significantly larger than that of the first belly. The bellies and waist are shaped so that the difference volume 14 between tube 5 and outer bulb 14 is optimized. no particular restrictions are imposed on the respective diameters. The neck of the aluminum reflector is crimped on the base stone 4. For this purpose, lateral holes are provided on the base brick (not shown). The neck is attached to a stepped recess 1 1 of the base.

The anti-burst tube is clamped on the base side of the neck of the reflector. The Burstschutzrohr sits on the upper edge of a further step. Other types of fastening are also possible.

In this embodiment, the tube 5 is intended solely as bursting protection.

FIG. 2 shows a further exemplary embodiment of a reflector lamp 15, in which the burst protection tube 5 is similarly shaped as in the first exemplary embodiment. In addition, however, the lamp contains a cap 17 as an antiglare, which is turned up on the closed end of the tube 5. It is preferably made of metal. In this case, the first belly 12 with a small maximum diameter serves as a holder for the cap 17, which is shaped quite similarly. The difference between waist and maximum diameter of the first belly must be so small that the spring forces of the cap allow slipping over. The cap 17 also has an elongated skirt 18, which is adapted to the upper half of the second belly 14, and whose length achieves exactly the desired glare protection.

Figure 3 shows an embodiment of a reflector lamp 20, wherein the glare protection is realized by a coating 21 which is externally applied to the tube 5. The coating 21 extends over part of the second belly 14, the waist 13, the first belly 12 and the dome 10.

FIG. 4 shows a further exemplary embodiment of a tube 22 in which a single belly 23 is used. Here, the circumferential groove 24 is located, the is located in the neck area of the tube and allows anchoring to the reflector.

The protective tube can either have two open ends, or a first, open end adjacent the neck and a second, closed end adjacent to the outlet opening. In the case of two open ends, the protective tube is possibly still covered by an additional cap which closes the second end loose.

FIG. 5 shows a reflector lamp 65, in which the burst protection tube 66 has a circumferential groove 67 at the top and bottom, respectively. Several spring clips 68 are shaped to be snapped onto the end of the tube, similar to a so-called tab for files. In this case, several, here three, tab 68 are evenly distributed over the circumference of the tube, see Figure 6. The tab is bent in principle U-shaped with a long outer leg 70 and a short inner leg 69. The outer leg 70th is curved in an S-shape, so that it finds a hold in the groove 67 and on the other hand, its open end is bent outwards, namely so that it presses against the inner wall of the cap 72 by clamping. The inner leg 69 is slightly bent inwardly to clampingly support, together with the outer leg 70, the end of the tube 66. Of course, the circumferential channel can be replaced by local depressions, dents, etc.

Of course, the cap 72 does not necessarily require the overhanging screen to function, but it is advantageous for the desired shielding of the light source. The light source may be, for example, a halogen incandescent lamp or high pressure discharge lamp.

Claims

claims

1. A light unit having a concave reflector provided with an outlet opening, a neck and an axis, the reflector surrounding an axially elongated light source, the light source being spaced from a protective tube, characterized in that the protective tube is a first, neck adjacent the end and a second end adjacent the exit opening, the protective tube being connected to the neck proximate the first end, the protective tube having a diameter at least proximate the first end and adapted to the neck the protective tube has at least one belly, which bulges outwards.

2. Light unit according to claim 1, characterized in that the protective tube behind the first belly has a waist and in particular after the waist has a second belly, in particular with a larger diameter than the first belly.

3. Light unit according to claim 1, characterized in that an anti-glare cap is placed on at least the first belly, the contour of the abdomen is adapted so that it holds on it by itself.

4. Light unit according to claim 1, characterized in that a coating or matting is applied to a portion of the tube which extends at least from the dome to the maximum diameter of the first belly.

5. Light unit according to claim 1, characterized in that on the protective tube, a glare cap is placed, wherein the protective tube has a groove or sections depressions at least one end are anchored in the suitably shaped spring clips, which have two legs and thus the end of Protective tube surround and wherein the outer leg is bent outwards, so that he the inner wall of a cylindrical portion of the visor cap is clamped.

6. Light unit according to claim 1, characterized in that the protective tube has a second end which is closed.