EP1670037A1 - Incandescent lamp - Google Patents

Abstract

A halogen filament lamp (HFL) (1) inserts into an outer bulb (50) supported by an Edison screw cap (ESC) (52) having a ceramic body (54) with its support flange (SF) (56) supporting the outer bulb and inserted in the HFL. The SF supports a threaded sleeve (58) on the ESC. Contact surfaces (60,62) link to associated contact pins via feeder wires (64,66).

Description

Technical area

The invention relates to an incandescent lamp, in particular a halogen incandescent lamp according to the preamble of claim 1.

State of the art

DE 296 20 098 U 1 discloses a halogen incandescent lamp in which a luminous element in the form of a helix is accommodated in a lamp vessel or bulb. The lamp vessel is sealed on one side with a pinch, through which a current supply arrangement for the helix is passed. Such a lamp is operated in the medium-voltage and high-voltage range, wherein it can come to an arc discharge between two adjacent power supply lines of the power supply arrangement due to the high operating voltage. This arc is u. a. by a short circuit between helical parts, which can be caused, for example, by touching two helical limbs (mainly in U- or V-shaped bulbs) or breakage of the helical wire in each case during lamp operation. Towards the end of the service life of such a halogen incandescent lamp, critical thin spots (hot spots) can form on the helices, which in particular burn through during the switch-on process. As a result of the partial burning off of the helical material, an arc arises between the two current leads, in particular above the pinch. Due to the short-circuit current such high temperatures can occur in the pinch that the lamp explodes.

In order to prevent such thermal overloading of the pinch, it is proposed in DE 296 20 098 U1 to carry out at least a portion of an inner power supply with a comparatively small cross section and to embed it almost completely in the pinch.

Upon the occurrence of a short-circuit current, part of the wire material evaporates within the pinch and there is a free capillary along which the discharge initially continues to burn. From an effective length of the free capillary, the discharge arc comes to extinguish itself very quickly. Such a form of fuse is also referred to as an inherent fuse. It has been found that it is not possible in some applications, to choose the diameter of the power supply so low that it complies with the requirements of DE 296 20 098 U1, so that further safety precautions must be taken.

In US-PS 4,132,922 a fuse is shown in which the power supply via a U-shaped fused wire region takes place, the end portions are embedded in the pinch and the central part protrudes into the interior of the piston. This U-shaped fusible wire area requires the insertion of its own sealing film in the pinch, so that due to the additional components of the procedural and device technical complexity for the production of the halogen lamp is relatively large.

The German Utility Model DE 91 02 566 U1 shows a fuse in which the power supply lines are formed by simply coiled portions which are embedded in the pinch so that the space encompassed by the helix remains as a hose-like cavity, the outlet channel when an arc occurs acts. Such an inherent security can be produced only with great procedural effort.

Presentation of the invention

The invention has for its object to provide an incandescent lamp, in particular a halogen incandescent lamp, which can be operated with high reliability and can be produced in a simple manner.

This object is achieved by the features of claim 1. Particularly advantageous embodiments of the invention are described in the dependent claims.

The incandescent lamp according to the invention is intended in particular for operation in the medium and high-voltage range and has a piston, in the interior of which a luminous element is accommodated. The interior is sealed by a pinch seal through which a power supply for the filament is performed. This power supply has a coiled power supply portion which is substantially embedded in the pinch and embraces a plug-in core, the length of which is adapted to the length of the power supply portion. In addition, a preferably accommodated in the lamp base pre-fuse is used.

It was found that with this construction, even when using helical wires with a comparatively large diameter, a thermal overheating of the pinch and thus a lamp burst can be prevented.

A reliable response of the backup fuse is ensured because an arc of high current strength forms due to the coiled and provided with plug-in power supply sections, so that the backup fuse responds sufficiently fast and protects the bulb from lamp spots.

It has been found that this embodiment can be used particularly advantageously in incandescent lamp constructions in which it is necessary to form the power supply lines and the filament designed as a filament with a wire having a comparatively large diameter. This is the case, for example, when lamps in Noppentechnik, in which the filament is fixed in position by holding the piston, the coil is designed for a comparatively high power (typically> 150W) and is therefore made of tungsten wires of large diameter. This napping technique is described in EP 0 466 460 B1 of the Applicant. In this case, when using tungsten wires of large diameter - as usual when using the Noppentechnik usual - the Wendelende primary welding welded directly onto the molybdenum Einschmelzfolie, the reliability of the lamp can not be guaranteed by the inherent fuse effect described above. If such a lamp is then operated together with a backup fuse, then it can in time until until the pre-fuse has already responded to the lamp break. This problem can not be solved by choosing a more sensitive backup fuse, as this is then burdened by the regular lamp current too high and thus there is a risk of premature lamp failure due to failure of the overloaded by the regular lamp current backup fuse. The solution according to the invention makes it possible to perform the backup comparatively insensitive, so that their damage is excluded.

The mechanical connection between the coil of the power supply section and the plug-in core inserted therein is preferably effected by pressing the coil in the radial direction.

It was found that the same material, preferably tungsten, can be used for the helix and the insert core.

In a particularly preferred embodiment, the luminous element is designed as a helix, which is bent in a U-shaped or V-shaped manner and on whose limb one or two helix sections are respectively formed. These spiral sections can be designed as a double helix, wherein preferably the transition region to the executed as a primary winding, provided with a plug-in core power supply section is formed gewendelten.

The production of the filament is particularly simple when the filament sections and the power supply sections are made in one piece.

The lamp vessel may be received in an outer bulb carried by a screw base.

Brief description of the drawings

• Figur 1 eine Vorderansicht eines ersten erfindungsgemäßen Ausführungsbeispiels eines Kolbens einer Halogenglühlampe;
• Figur 2 einen Stromzuführungsabschnitt der Halogenglühlampe aus Figur 1 und
• Figur 3 ein Ausführungsbeispiel einer kompletten Halogenglühlampe mit einer im Schraubsockel integrierten Vorsicherung.

The invention will be explained in more detail below with reference to preferred embodiments. Show it:

• Figure 1 is a front view of a first embodiment of a piston according to the invention of a halogen incandescent lamp;
• 2 shows a power supply section of the halogen incandescent lamp of Figure 1 and
• Figure 3 shows an embodiment of a complete halogen incandescent lamp with an integrated fuse in the screw base.

Preferred embodiments of the invention

Figure 1 shows a side view of a halogen incandescent lamp 1 for general lighting purposes, which can be used in particular in the NV and MV range.

The halogen incandescent lamp 1 has a bulb 2 made of quartz glass. At one end portion of the piston 2, a dome 4 is formed, which carries a central pump neck gel approach 6. At this, a pumping tube is set in the production of the halogen incandescent lamp 1, through which the interior of the piston 8 is evacuated and filled with a filling gas containing halogens. After filling, the pump tube is removed and the pump neck gel approach 6 sealed.

At the end portion of the piston 2 remote from the tip 4, a pinch seal 8 is formed. over which an interior 10 of the piston 2 is sealed.

In the interior 10 is a luminous body 12 (dashed lines in Figure 1) added, which is bent approximately U-shaped in the illustrated embodiment, wherein at each U-leg two spiral sections 14. 16; 18. 19 are formed from double wraps. The two spiral sections 14, 16; 18, 19 of each U-leg are connected via a connecting part 20 and 22 and the two in the figure 1 overhead coil sections 14, 19 via an approximately horizontally extending connecting part 24 with each other. The two adjacent to the pinch seal 8 coil sections 16, 18 go into short sections, which act as internal power supply 26. 28.

In the illustrated embodiment, the connecting parts are 20. 22; 24 executed uncoupled, the inner power supply lines 26, 28 are at least for Crushing manufactured uncoupled, this, the connecting parts 20, 22, 24 and the helical sections 14, 16, 18 and 19 are integrally made of the same helical wire.

The converted inner power supply lines 26, 28 each go into power supply sections 30, 32, which are also made in one piece with the filament 12 from the helical wire. According to the invention, these power supply sections 30, 32 are embedded with the predominant part of their length in the pinch seal 8 and dive with comparatively short end sections, for example about 1-2mm, into the interior 10 of the piston 2.

The position fixation of the above-described filament 12 takes place in the illustrated embodiment by the so-called Noppentechnik, in which by deformation of the glass bulb 2 glass webs or holding nubs 34, 36, 38 are formed, which extend in pairs diametrically opposite each other radially inwardly to the connecting parts 20, 22, 24 and are formed so that the connecting parts 20, 22, 24 are clamped between the holding nubs, so that the luminous body 12 is reliably held within the interior 10. This technique is described in detail in the above-mentioned EP 0 446 460 B1, so that further embodiments are dispensable.

The design of the coil to a comparatively high power consumption requires that the helical wire must be made comparatively strong, so that the inherent fuse used in the prior art described above is not or at least effective only with reduced reliability, so that when an arc occurs Overheating and explode the pinch seal 8 could come. This is avoided in the solution according to the invention by the particular embodiment of the two power supply sections 30. 32 with simultaneous use of Vorsicherungen. The power supply lines 30, 32 will be explained with reference to FIG. This figure shows that end portion of the luminous element 12, which is arranged in the hatched area of FIG. Accordingly, in this embodiment, the inner power supply 26 is uncoiled formed and passes into the power supply section 32, which is formed by a Erstgewendel 40. This is performed, for example, with the same pitch as the Erstgewendel the total double-helical sections 14, 16, 18, 19. Of course, another pitch can be chosen.

In the space surrounded by the Erstgewendel 40 a plug-in core 42 is inserted, which in the described embodiment of the same material as the luminous element 12, i. made of tungsten. The connection between the insert core 42 and the Erstgewendel 40 is effected by pressing the coil in the central region 44 in the radial direction to the outer periphery of the Einsteckkerns, wherein the deformation is preferably carried out in the warm state of Erstgewendels 40. 2, the first helix 40 ends just above the end section of the insertion core 42 lying below in FIG.

The thus formed power supply sections 30, 32 are embedded with their predominant length portion in the pinch seal 8 and welded there with a sealing film 46 and 48 made of molybdenum. The lower end portions of the two sealing foils 46, 48 located in FIG. 1 are welded to contact pins 49, 51, the end portions of which protrude from the pinch seal 8.

The halogen burner 1 is designed with a backup fuse, as shown by the example of a complete lamp in Figure 3.

FIG. 3 shows the complete halogen lamp, in which the previously described halogen incandescent lamp 1 is inserted into an outer bulb 50, which is supported by a screw base 52. This has in the illustrated embodiment, a ceramic body 54, supported on the support flange 56 of the outer bulb 50 and in which the incandescent lamp 1 is inserted. The support flange 56 further carries a threaded sleeve 58 of the screw 52. At this threaded sleeve 58 and the support flange 56 contact surfaces 60, 62 are formed, which are connected via lead wires 64, 66 with the associated contact pin 49 and 51 respectively. As a connection between the contact pins 49, 51 and the contact surfaces 60, 62 is shown in the This backup fuse preferably consists of a enclosed by a cartridge of glass fuse wire and external lead wires to the glass cartridge. The backup fuse is designed so that it does not "burn out" at regular lamp current.

Occurs in such a construction - for example, when burning through the filament 12 upon reaching the end of life - an arc, it runs in the inventive solution above the pinch seal 8 and due to the inventive design of the power supply sections 30, 32 with a very high current strength, the an extremely fast response of the backup fuse 68, 70 leads, so that the power supply is interrupted and bursting of the bulb 1 is reliably prevented. Without these inventively designed power supply sections 30, 32, the back-up device 68, 70 would respond so late in a lamp designed in Noppentechnik lamp and thereby required diameter of the filament used for the filament 12, that it can lead to a lamp burst.

Of course, the backup fuse 68, 70 are formed in other ways as shown in Figure 3. The above-described lamps are designed, for example, for a power consumption of 250 watts at a nominal voltage of 230 volts. The required service life is at least 2400 hours. In the illustrated embodiment, the diameter of the Einsteckkerns 42 2mm, the length is 7.0 mm, the length of the Erstgewendels 40 is 6.9 mm and the diameter of the wire used for the filament 12 is 82 microns as the starting material.

Disclosed is an incandescent lamp 1, in particular provided for the medium-voltage and high-voltage range halogen incandescent lamp with a piston 2, in the interior 10, a preferably coiled filament 12 is added. Whose power supply lines are guided by a pinch seal 8 of the piston 2 and according to the invention have coiled power supply sections 30, 32 which engage around a plug-in core 42. The light bulb 1 is assigned a backup fuse 68, 70, which responds when an arc of high current occurs. In a preferred embodiment, the luminous element 12 is held with retaining studs 34, 36, 38, which are formed integrally on the piston 2.

Claims (13)

Incandescent lamp, in particular for the medium-voltage and high-voltage range provided halogen incandescent lamp, with a piston (2), in the interior (10) a luminous body (12) is received, the power supply is guided by a piston (2) sealing pinch seal (8), characterized in that the power supply has a in the pinch seal (8) partially embedded power supply section (30, 32) which is formed by a helix (40) which engages around a plug-in core (42). Incandescent lamp according to claim 1, wherein it has a backup fuse (68, 70). Incandescent lamp according to claim 1 or 2, wherein the luminous body (12) by at least one retaining lug (34, 36, 38) is supported, which is integrally formed on the piston (2). Incandescent lamp according to one of the preceding claims, wherein the diameter of the filament and / or the filament (40) forming wire> 50 microns and more preferably> 80 microns. Incandescent lamp according to one of the preceding claims, wherein the power supply in each case has two inner uncoiled or designed as a single winding power supply lines (26, 28) which are each provided with a power supply section (30. 32). Incandescent lamp according to one of the preceding claims, wherein the coil (40) in a section (44) is pressed by hot deformation of the insert core (42). An incandescent lamp as claimed in any one of the preceding claims, wherein the power supply section (30, 32) and plug core (42) are made of tungsten. Incandescent lamp according to one of the preceding claims, wherein the luminous body (12) is a U- or V-shaped curved coil, on the legs of each one or two helical sections (14, 16, 18, 19) are formed. An incandescent lamp according to claim 8, wherein the coil sections (14, 16, 18, 19) are double helix. Incandescent lamp according to claim 8 or 9, wherein the power supply section (30, 32) is formed integrally with the helix. Incandescent lamp according to one of claims 8 to 10, wherein the area between the helical sections (14, 16, 18, 19) and the power supply sections (30, 32) is in each case uncoiled or designed as a single reel. Incandescent lamp according to one of the preceding claims, wherein the power supply sections (30, 32) in the pinch seal (8) with sealing foils (46, 48) are connected to which in each case a contact pin (49, 51) is fixed, which from the pinch seal ( 8) stands out. Incandescent lamp according to one of the preceding claims, wherein the piston (2) by an outer piston (50) is embraced, which in turn is supported on a screw base (52).

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