EP1286384A1 - Lamp with anti-explosion device - Google Patents

Lamp with anti-explosion device Download PDF

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Publication number
EP1286384A1
EP1286384A1 EP02078423A EP02078423A EP1286384A1 EP 1286384 A1 EP1286384 A1 EP 1286384A1 EP 02078423 A EP02078423 A EP 02078423A EP 02078423 A EP02078423 A EP 02078423A EP 1286384 A1 EP1286384 A1 EP 1286384A1
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EP
European Patent Office
Prior art keywords
filament
lamp
metal
support
axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP02078423A
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German (de)
French (fr)
Inventor
Jacky Société Civile S.P.I.D. Marchand
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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Filing date
Publication date
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Publication of EP1286384A1 publication Critical patent/EP1286384A1/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/62—One or more circuit elements structurally associated with the lamp
    • H01K1/70—One or more circuit elements structurally associated with the lamp with built-in short-circuiting device, e.g. for serially connected lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/18—Mountings or supports for the incandescent body

Definitions

  • the invention relates to an incandescent electric lamp comprising a bulb having an axis of revolution, a first and a second conducting wire intended for a current supply of said lamp, a filament having windings arranged in a spiral around a parallel axis of revolution. to the axis of revolution of said bulb and having a first and a second end, the first end of said filament being connected to the first conductive wire by means of a first metal tab, and a metal support having a first and a second end, the first end of said metal support being connected to the second conductive wire by means of a second metal tab, the second end of said metal support being connected to the second end of said filament.
  • a lamp finds application, for example, in a heating system dedicated to the manufacture of semiconductor components.
  • Such a lamp is described in US Patent 3,403,280 issued on 24 September 1968.
  • One of the aims of the invention disclosed in this patent is to ensure positioning of the filament so that the axis of rotation of the windings of the filament is substantially coincident with the axis of rotation of the bulb.
  • the axis of rotation of the windings of the filament is generally horizontal, i.e. perpendicular to a weight vector filament.
  • such a lamp is often used to dissipate a great power, for example a few thousand Watts. Under such conditions, the filament reaches a relatively high temperature when it is traversed by a current.
  • the filament Under the effect of the high temperature and its weight, the filament has tendency to deform mechanically by developing a downward curvature, that is, the windings of the filament collapse, the collapse of a winding being all the higher as the winding is located in an area filament center.
  • this subsidence is all the more important as the filament has a long operating life. So when the lamp has operated for a relatively long time, the subsidence may be such that the filament comes into contact with the bulb, which can cause piercing or exploding the bulb, the temperature of the filament being higher than the melting point of the bulb generally consisting of quartz.
  • such lamps can be used, for example, in manufacturing of semiconductors. An explosion is therefore harmful, because quartz debris can then pollute the semiconductors.
  • An object of the invention is to propose an anti-explosion device for an incandescent lamp.
  • an incandescent electric lamp as defined in the opening paragraph is characterized in that it includes a metal reinforcement in electrical contact with one of the ends or one of the windings of said filament and comprising a substantially rectilinear part parallel to the axis of revolution of said filament and located below said filament when the lamp is in normal operating conditions.
  • the lamp is characterized in that said metal frame is linked to the first metal tab.
  • the metal frame can be a simple straight rod welded to the metal tab, which makes such a frame metal particularly simple to manufacture and install in the lamp.
  • the lamp is characterized in that said metal frame is linked to the support metallic.
  • the metal support can itself play a role of metal reinforcement responsible for the short circuit causing a rupture of the filament. Thus, the number of parts necessary for the manufacture of the lamp is reduced.
  • the lamp is characterized in that that it further comprises at least one intermediate support attached to a winding of said filament.
  • the intermediate support (s) attached to the filament reduce sagging and thus delay contact between the filament and the metallic reinforcement, which increases the time during which the lamp can work.
  • the lamp is characterized in that the intermediate support (s) are located at the above the filament when the lamp is in its normal conditions of operation.
  • the intermediate support (s) are located at the above the filament when the lamp is in its normal conditions of operation.
  • the lamp is characterized in that said metal frame is linked to one of the at least one intermediate support.
  • one of the supports intermediaries can itself play the role of the metal frame, which reduces the number of parts required to manufacture such a lamp.
  • FIG. 1a illustrates a lamp according to a first particular embodiment of the invention.
  • a lamp comprises a bulb 100 having an axis of revolution 102, a first conducting wire 103, a second conducting wire 104, a filament 105 comprising a first end 105a and a second end 105b, a first metallic tab 106, a second metallic tab 107, a metal support 108 comprising a first end 108a and a second end 108b, and a metal frame 109.
  • the filament 105 comprises eight windings A to H.
  • Such a lamp can also include a pinch seal 101 as well as a bridge 110 in insulating material, being able to hold certain elements of the lamp in position, such as the filament 105, the metal support 108 and the metal frame 109.
  • the first end 105a of the filament 105 is connected to the first conducting wire 103 thanks to the first metal tab 106.
  • the metal tabs 106 and 107 represent means for electrically connecting elements, such as the first conducting wire 103 and the filament 105.
  • Said tabs metal 106 and 107 may be a metal plate on which the elements are welded. They can also be welding points, that is to say that the elements to be electrically connected are directly welded to each other.
  • the second end 105b of the filament 105 is connected to the second end 108b of the metal support 108 and the first end 108a of the metal support 108 is connected to the second conductive wire 104 through the second metal tab 107.
  • the filament 105 and the support metallic 108 form a current circuit.
  • the current arrives through the second conductive wire 104, passes through the metal support 108 then, in order, the windings A, B, C, D, E, F, G and H and exits through the first conductive wire 103.
  • this current crosses the filament 105, it causes, by Joule effect, a heating of the filament, which then becomes a source of light.
  • the metal frame 109 is welded to the first metal tab 106 and is therefore in electrical contact with the first end 105a of the filament 105, also welded to this tab.
  • an object A and an object B are in electrical contact it is meant that the object A and the object B are at the same electrical potential.
  • Figure 1b shows a section of the lamp of Figure la according to a YY axis.
  • the metal support 108 is located outside a plane formed by the axis of revolution 102 and the metal frame 109, in order to avoid any contact between windings of the filament 105 and the metal support 108, when the filament 105 sags.
  • Figure 1c helps understand the role of the metal frame 109.
  • one of the windings for example the winding E
  • the current arrives via the second conducting wire 104, crosses the support metallic 108 then, in order, the windings A, B, C, D and then borrows the least resistive path possible, i.e. the metal reinforcement 109, for finally come out through the first conducting wire 103.
  • the windings E, F, G and H are short-circuited. It follows an increase in a current intensity in the windings A, B, C and D, which causes sufficiently intense heating to cause rupture of the filament 105.
  • FIG. 2a illustrates a lamp according to a second embodiment particular of the invention.
  • the metal frame is linked to the metal support 108.
  • linked it is meant that the armature metal can be a metal part welded or attached to the metal support 108, or that the metal frame can be an integral part of the support metallic, that is to say that the metallic support 108 itself plays the role of the metal frame 109.
  • the metal support 108 has a straight part located below the filament 105. It thus plays the role of the metal frame 109 of FIG. 1a.
  • the metal support 108 has a hook 108c, as it is indicated in Figure 2b, which is a sectional view along the axis YY.
  • Figure 2c makes it possible to understand how such a metallic support 108 plays the role of a metal reinforcement responsible for the short circuit resulting in rupture of the filament.
  • the current arrives via the second conducting wire 104, passes through the metal support 108 up to this point of contact P, then crosses the windings E, F, G and H, to finally come out through the first conducting wire 103.
  • the windings A, B, C and D are short-circuited and, for reasons identical to those described in the description of Figure 1c, the filament breaks.
  • the lamp further comprises at at least one intermediate support attached to a winding of said filament
  • FIG. 3a illustrates a lamp according to a first embodiment particular of this variant and Figure 3b is a section of such a lamp according to a YY axis.
  • a lamp comprises, in addition to the elements already described in the figure 1a, a first intermediate support 111 and a second intermediate support 112, located above the filament 105.
  • These two intermediate supports ensure good maintenance of the filament 105 and reduce its sagging. In this way, the rupture of the filament 105 caused by the metal frame 109 occurs after a time lamp operation higher than in the absence of such supports intermediate.
  • Intermediate supports 111 and 112 can be built into bridge 110 or in pinch seal 101. They may have, as shown in FIG. 3a, a hook-shaped end, which makes their installation in the particularly simple lamp.
  • FIG. 4a illustrates a lamp according to a second embodiment particular of this variant and Figure 4b is a sectional view of such a lamp along the YY axis.
  • the metal frame is linked to a intermediate supports.
  • linked is meant that the armature metal can be a metal part welded or attached to a support intermediate, or that the metal reinforcement can be an integral part of a intermediate support, i.e. an intermediate support plays the role itself of the metal frame 109.
  • the second support intermediate 112 is extended by a metal part comprising a part straight below the filament 105. It thus plays the role of the armature metal 109 of Figure 1a.
  • the first intermediate support 111 could also play this role.
  • the second intermediate support 112 bypasses the filament 105, as can be seen in FIG. 4b, so that it does not come into contact with the filament 105, at a point other than at its hook, only when the filament 105 collapses.
  • Figure 4c shows how such a support intermediate 112 acts as a metal frame responsible for the short circuit causing a filament break.
  • the current arrives via the second conducting wire 104, crosses the support metallic 108, then the windings A, B, C, D and E to the point of contact P, then the second intermediate support 112 to its hook, and finally the windings G and H, to come out through the first conducting wire 103.
  • winding F and part of winding E are short-circuited and, for reasons identical to those described in the description of Figure 1c, the filament 105 may break.
  • the heating caused by the short circuit is less important than in a case where the armature is used metallic 109, for example in the lamp of FIG. 1a. Indeed, a number less windings is short-circuited in the case of Figure 4c. However, this heating may be sufficient to cause the rupture of the filament 105.
  • Figures 1a to 4c illustrate examples of implementation of the invention.
  • the invention is not limited to these examples only.
  • Other types metallic reinforcements can be imagined, since these reinforcements are capable of causing a short circuit in certain windings of the filament 105, in order to avoid an explosion of the lamp at the end of its life.
  • a metal frame can be connected to filament 105 in places other than those described in these figures.
  • the metal frame 109 can be directly welded or attached to the first end 105a of the filament 105, instead of being welded to the first metal tab 106. It can also be welded or attached to one of the filament windings 105, by example winding H.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Abstract

The bulb includes a metallic armature (109) in electrical contact with one of the ends or windings of the filament. It incised a sensibly rectilinear part parallel to the filament axis and situated below the filament when the lamp is in its normal operating condition. The armature is linked to a first metallic foot or support. Incandescent electric lamp bulb including: (a) a bulb (100) with axis (102); first (103) and second (104) supply conductors; a filament (105), with coils (A-H) spiraled around an axis parallel to the bulb axis, and having first (105a) and second (105b) ends . The first end is connected to the conductor (103) by means of a metallic foot (106): a metallic support (108) having a first (108a) and second (108b). The first end is connected to the conductor (104) by means of a metallic foot (107). The end (108b) is connected to the filament end (105b).

Description

DOMAINE TECHNIQUETECHNICAL AREA

L'invention concerne une lampe électrique incandescente comprenant une ampoule possédant un axe de révolution, un premier et un deuxième fil conducteur destinés à une alimentation en courant de ladite lampe, un filament présentant des enroulements disposés en spirale autour d'un axe de révolution parallèle à l'axe de révolution de ladite ampoule et possédant une première et une deuxième extrémité, la première extrémité dudit filament étant reliée au premier fil conducteur grâce à une première patte métallique, et un support métallique possédant une première et une deuxième extrémité, la première extrémité dudit support métallique étant reliée au deuxième fil conducteur grâce à une deuxième patte métallique, la deuxième extrémité dudit support métallique étant reliée à la deuxième extrémité dudit filament.
Une telle lampe trouve une application, par exemple, dans un système de chauffage dédié à une fabrication de composants semi-conducteurs.The invention relates to an incandescent electric lamp comprising a bulb having an axis of revolution, a first and a second conducting wire intended for a current supply of said lamp, a filament having windings arranged in a spiral around a parallel axis of revolution. to the axis of revolution of said bulb and having a first and a second end, the first end of said filament being connected to the first conductive wire by means of a first metal tab, and a metal support having a first and a second end, the first end of said metal support being connected to the second conductive wire by means of a second metal tab, the second end of said metal support being connected to the second end of said filament.
Such a lamp finds application, for example, in a heating system dedicated to the manufacture of semiconductor components.

ETAT DE LA TECHNIQUE ANTERIEURESTATE OF THE PRIOR ART

Une telle lampe est décrite dans le brevet US 3,403,280 délivré le 24 Septembre 1968. Un des buts de l'invention divulguée dans ce brevet est d'assurer un positionnement du filament de sorte que l'axe de rotation des enroulements du filament soit sensiblement confondu avec l'axe de rotation de l'ampoule. Dans des conditions normales d'utilisation de la lampe, l'axe de rotation des enroulements du filament est généralement horizontal, c'est à dire perpendiculaire à un vecteur poids du filament. Cependant, une telle lampe est souvent utilisée pour dissiper une grande puissance, par exemple quelques milliers de Watts. Dans de telles conditions, le filament atteint une température relativement élevée lorsqu'il est parcouru par un courant. Sous l'effet de la température élevée et de son poids, le filament a tendance à se déformer mécaniquement en développant une courbure vers le bas, c'est à dire que les enroulements du filament s'affaissent, l'affaissement d'un enroulement étant d'autant plus élevé que l'enroulement se situe dans une zone centrale du filament. En outre, cet affaissement est d'autant plus important que le filament a une durée de fonctionnement importante. Ainsi, lorsque la lampe a fonctionné pendant une durée relativement grande, l'affaissement peut être tel que le filament vient entrer en contact avec l'ampoule, ce qui peut provoquer un percement ou une explosion de l'ampoule, la température du filament étant supérieure à la température de fusion de l'ampoule constituée généralement de quartz. Or, de telles lampes peuvent être utilisées, par exemple, dans la fabrication de semi-conducteurs. Une explosion est en conséquence dommageable, car des débris de quartz peuvent alors polluer les semi-conducteurs.Such a lamp is described in US Patent 3,403,280 issued on 24 September 1968. One of the aims of the invention disclosed in this patent is to ensure positioning of the filament so that the axis of rotation of the windings of the filament is substantially coincident with the axis of rotation of the bulb. In normal conditions of use of the lamp, the axis of rotation of the windings of the filament is generally horizontal, i.e. perpendicular to a weight vector filament. However, such a lamp is often used to dissipate a great power, for example a few thousand Watts. Under such conditions, the filament reaches a relatively high temperature when it is traversed by a current. Under the effect of the high temperature and its weight, the filament has tendency to deform mechanically by developing a downward curvature, that is, the windings of the filament collapse, the collapse of a winding being all the higher as the winding is located in an area filament center. In addition, this subsidence is all the more important as the filament has a long operating life. So when the lamp has operated for a relatively long time, the subsidence may be such that the filament comes into contact with the bulb, which can cause piercing or exploding the bulb, the temperature of the filament being higher than the melting point of the bulb generally consisting of quartz. However, such lamps can be used, for example, in manufacturing of semiconductors. An explosion is therefore harmful, because quartz debris can then pollute the semiconductors.

EXPOSE DE L'INVENTIONSTATEMENT OF THE INVENTION

Un but de l'invention est de proposer un dispositif anti-explosion pour une lampe incandescente.An object of the invention is to propose an anti-explosion device for an incandescent lamp.

Selon l'invention, une lampe électrique incandescente telle que définie dans le paragraphe d'ouverture est caractérisée en ce qu'elle comprend une armature métallique en contact électrique avec une des extrémités ou un des enroulements dudit filament et comprenant une partie sensiblement rectiligne parallèle à l'axe de révolution dudit filament et située en dessous dudit filament lorsque la lampe se trouve dans des conditions normales de fonctionnement.According to the invention, an incandescent electric lamp as defined in the opening paragraph is characterized in that it includes a metal reinforcement in electrical contact with one of the ends or one of the windings of said filament and comprising a substantially rectilinear part parallel to the axis of revolution of said filament and located below said filament when the lamp is in normal operating conditions.

Lorsque le filament s'affaisse beaucoup, un des enroulements situé dans une zone centrale du filament entre en contact avec l'armature métallique avant de toucher l'ampoule. De ce fait, environ une moitié du filament se trouve court-circuitée. Il s'ensuit une diminution de résistance du filament, donc une augmentation d'intensité de courant dans le filament et enfin une augmentation de la température du filament. Le filament atteint alors une température supérieure à sa température de fusion et se rompt. Dès lors, la lampe ne fonctionne plus et ne peut pas exploser, puisque le filament ne peut atteindre l'ampoule lorsque la lampe est en fonctionnement.When the filament sags a lot, one of the windings located in a central area of the filament comes into contact with the metallic reinforcement before touching the bulb. As a result, about half of the filament is found shorted. This results in a decrease in resistance of the filament, therefore a increase in current intensity in the filament and finally an increase in the filament temperature. The filament then reaches a temperature above its melting point and breaks. Therefore, the lamp no longer works and does not cannot explode, since the filament cannot reach the bulb when the lamp is in operation.

Dans un premier mode de réalisation particulier de l'invention, la lampe est caractérisée en ce que ladite armature métallique est liée à la première patte métallique. Selon ce mode de réalisation, l'armature métallique peut être une simple tige rectiligne soudée à la patte métallique, ce qui rend une telle armature métallique particulièrement simple à fabriquer et à installer dans la lampe.In a first particular embodiment of the invention, the lamp is characterized in that said metal frame is linked to the first metal tab. According to this embodiment, the metal frame can be a simple straight rod welded to the metal tab, which makes such a frame metal particularly simple to manufacture and install in the lamp.

Dans un deuxième mode de réalisation particulier de l'invention, la lampe est caractérisée en ce que ladite armature métallique est liée au support métallique. Selon ce mode de réalisation, le support métallique peut lui-même jouer un rôle d'armature métallique responsable du court-circuit entraínant une rupture du filament. Ainsi, le nombre de pièces nécessaires à la fabrication de la lampe est réduit.In a second particular embodiment of the invention, the lamp is characterized in that said metal frame is linked to the support metallic. According to this embodiment, the metal support can itself play a role of metal reinforcement responsible for the short circuit causing a rupture of the filament. Thus, the number of parts necessary for the manufacture of the lamp is reduced.

Dans une variante de l'invention, la lampe est caractérisée en ce qu'elle comprend en outre au moins un support intermédiaire accroché à un enroulement dudit filament. Le ou les supports intermédiaires accrochés au filament permettent de diminuer l'affaissement de celui-ci et ainsi de retarder le contact entre le filament et l'armature métallique, ce qui augmente la durée pendant laquelle la lampe peut fonctionner. In a variant of the invention, the lamp is characterized in that that it further comprises at least one intermediate support attached to a winding of said filament. The intermediate support (s) attached to the filament reduce sagging and thus delay contact between the filament and the metallic reinforcement, which increases the time during which the lamp can work.

Dans un premier mode de réalisation particulier de cette variante, la lampe est caractérisée en ce que le ou les supports intermédiaires sont situés au dessus du filament lorsque la lampe se trouve dans ses conditions normales de fonctionnement. Un tel mode de réalisation assure un bon maintien du filament, puisque la déformation mécanique subie par le filament a lieu vers le bas. De plus, des risques de contact impliquant un support intermédiaire et deux enroulements sont supprimés, ce qui est bénéfique puisqu'un tel contact entraínerait un court-circuit non désiré, fatal pour la lampe.In a first particular embodiment of this variant, the lamp is characterized in that the intermediate support (s) are located at the above the filament when the lamp is in its normal conditions of operation. Such an embodiment ensures good retention of the filament, since the mechanical deformation undergone by the filament takes place downwards. Moreover, risk of contact involving an intermediate support and two windings are removed, which is beneficial since such contact would cause a short circuit unwanted, fatal for the lamp.

Dans un deuxième mode de réalisation particulier de cette variante, la lampe est caractérisée en ce que ladite armature métallique est liée à un parmi les au moins un support intermédiaire. Selon ce mode de réalisation, un des supports intermédiaires peut lui-même jouer le rôle de l'armature métallique, ce qui réduit le nombre de pièces nécessaire à la fabrication d'une telle lampe.In a second particular embodiment of this variant, the lamp is characterized in that said metal frame is linked to one of the at least one intermediate support. According to this embodiment, one of the supports intermediaries can itself play the role of the metal frame, which reduces the number of parts required to manufacture such a lamp.

BREVE DESCRIPTION DES FIGURESBRIEF DESCRIPTION OF THE FIGURES

L'invention sera mieux comprise et d'autres détails apparaítront dans la description qui va suivre en regard des dessins annexés qui sont donnés à titre d'exemples non limitatifs et dans lesquels :

  • les figures 1a et 1b sont respectivement une vue de face et une vue en coupe d'une lampe selon un premier mode de réalisation particulier de l'invention et la figure 1c illustre un court-circuit dans cette lampe ;
  • les figures 2a et 2b sont respectivement une vue de face et une vue en coupe d'une lampe selon un deuxième mode de réalisation particulier de l'invention et la figure 2c illustre un court-circuit dans cette lampe ;
  • les figures 3a et 3b sont respectivement une vue de face et une vue en coupe d'une lampe selon un premier mode de réalisation particulier d'une variante de l'invention ;
  • les figures 4a et 4b sont respectivement une vue de face et une vue de côté d'une lampe selon un deuxième mode de réalisation particulier d'une variante de l'invention et la figure 4c illustre un court-circuit dans cette lampe.
The invention will be better understood and other details will appear in the description which follows with reference to the appended drawings which are given by way of nonlimiting examples and in which:
  • Figures 1a and 1b are respectively a front view and a sectional view of a lamp according to a first particular embodiment of the invention and Figure 1c illustrates a short circuit in this lamp;
  • Figures 2a and 2b are respectively a front view and a sectional view of a lamp according to a second particular embodiment of the invention and Figure 2c illustrates a short circuit in this lamp;
  • Figures 3a and 3b are respectively a front view and a sectional view of a lamp according to a first particular embodiment of a variant of the invention;
  • Figures 4a and 4b are respectively a front view and a side view of a lamp according to a second particular embodiment of a variant of the invention and Figure 4c illustrates a short circuit in this lamp.

EXPOSE DETAILLE D'AU MOINS UN MODE DE REALISATION DE L'INVENTIONDETAILED PRESENTATION OF AT LEAST ONE EMBODIMENT OF THE INVENTION

La figure 1a illustre une lampe selon un premier mode de réalisation particulier de l'invention. Une telle lampe comprend une ampoule 100 possédant un axe de révolution 102, un premier fil conducteur 103, un deuxième fil conducteur 104, un filament 105 comprenant une première extrémité 105a et une deuxième extrémité 105b, une première patte métallique 106, une deuxième patte métallique 107, un support métallique 108 comprenant une première extrémité 108a et une deuxième extrémité 108b, et une armature métallique 109. Le filament 105 comprend huit enroulements A à H. Une telle lampe peut également comprendre un scellage de pincement 101 ainsi qu'un pont 110 en matière isolante, étant apte à maintenir en position certains éléments de la lampe, tel le filament 105, le support métallique 108 et l'armature métallique 109.
La première extrémité 105a du filament 105 est reliée au premier fil conducteur 103 grâce à la première patte métallique 106. Les pattes métalliques 106 et 107 représentent des moyens de relier électriquement des éléments, tels le premier fil conducteur 103 et le filament 105. Lesdites pattes métalliques 106 et 107 peuvent être une plaque de métal sur laquelle on vient souder les éléments. Elles peuvent également être des points de soudure, c'est à dire que les éléments à relier électriquement sont directement soudés l'un sur l'autre.
La deuxième extrémité 105b du filament 105 est reliée à la deuxième extrémité 108b du support métallique 108 et la première extrémité 108a du support métallique 108 est reliée au deuxième fil conducteur 104 grâce à la deuxième patte métallique 107. Ainsi, le filament 105 et le support métallique 108 forment un circuit de courant. Le courant arrive par le deuxième fil conducteur 104, traverse le support métallique 108 puis, dans l'ordre, les enroulements A, B, C, D, E, F, G et H et ressort par le premier fil conducteur 103. Lorsque ce courant traverse le filament 105, il provoque, par effet Joule, un échauffement du filament, qui devient alors une source de lumière. L'armature métallique 109 est soudée sur la première patte métallique 106 et est donc en contact électrique avec la première extrémité 105a du filament 105, également soudée sur cette patte. En effet, par l'expression «un objet A et un objet B sont en contact électrique », on entend que l'objet A et l'objet B sont à un même potentiel électrique.FIG. 1a illustrates a lamp according to a first particular embodiment of the invention. Such a lamp comprises a bulb 100 having an axis of revolution 102, a first conducting wire 103, a second conducting wire 104, a filament 105 comprising a first end 105a and a second end 105b, a first metallic tab 106, a second metallic tab 107, a metal support 108 comprising a first end 108a and a second end 108b, and a metal frame 109. The filament 105 comprises eight windings A to H. Such a lamp can also include a pinch seal 101 as well as a bridge 110 in insulating material, being able to hold certain elements of the lamp in position, such as the filament 105, the metal support 108 and the metal frame 109.
The first end 105a of the filament 105 is connected to the first conducting wire 103 thanks to the first metal tab 106. The metal tabs 106 and 107 represent means for electrically connecting elements, such as the first conducting wire 103 and the filament 105. Said tabs metal 106 and 107 may be a metal plate on which the elements are welded. They can also be welding points, that is to say that the elements to be electrically connected are directly welded to each other.
The second end 105b of the filament 105 is connected to the second end 108b of the metal support 108 and the first end 108a of the metal support 108 is connected to the second conductive wire 104 through the second metal tab 107. Thus, the filament 105 and the support metallic 108 form a current circuit. The current arrives through the second conductive wire 104, passes through the metal support 108 then, in order, the windings A, B, C, D, E, F, G and H and exits through the first conductive wire 103. When this current crosses the filament 105, it causes, by Joule effect, a heating of the filament, which then becomes a source of light. The metal frame 109 is welded to the first metal tab 106 and is therefore in electrical contact with the first end 105a of the filament 105, also welded to this tab. In fact, by the expression “an object A and an object B are in electrical contact”, it is meant that the object A and the object B are at the same electrical potential.

La figure 1b montre une coupe de la lampe de la figure la suivant un axe YY. Le support métallique 108 se situe en dehors d'un plan formé par l'axe de révolution 102 et l'armature métallique 109, afin d'éviter tout contact entre des enroulements du filament 105 et le support métallique 108, lorsque le filament 105 s'affaisse.Figure 1b shows a section of the lamp of Figure la according to a YY axis. The metal support 108 is located outside a plane formed by the axis of revolution 102 and the metal frame 109, in order to avoid any contact between windings of the filament 105 and the metal support 108, when the filament 105 sags.

La figure 1c permet de comprendre le rôle de l'armature métallique 109. Lorsque le filament 105 s'affaisse, un des enroulements, par exemple l'enroulement E, entre en contact avec l'armature métallique 109. Dans une telle situation, le courant arrive par le deuxième fil conducteur 104, traverse le support métallique 108 puis, dans l'ordre, les enroulements A, B, C, D et emprunte ensuite un chemin le moins résistif possible, c'est à dire l'armature métallique 109, pour enfin ressortir par le premier fil conducteur 103. Ainsi les enroulements E, F, G et H sont court-circuités. Il s'ensuit une augmentation d'une intensité de courant dans les enroulements A, B, C et D, qui provoque un échauffement suffisamment intense pour provoquer une rupture du filament 105.Figure 1c helps understand the role of the metal frame 109. When the filament 105 collapses, one of the windings, for example the winding E, comes into contact with the metal frame 109. In such a situation, the current arrives via the second conducting wire 104, crosses the support metallic 108 then, in order, the windings A, B, C, D and then borrows the least resistive path possible, i.e. the metal reinforcement 109, for finally come out through the first conducting wire 103. Thus the windings E, F, G and H are short-circuited. It follows an increase in a current intensity in the windings A, B, C and D, which causes sufficiently intense heating to cause rupture of the filament 105.

La figure 2a illustre une lampe selon un deuxième mode de réalisation particulier de l'invention. Selon ce mode de réalisation, l'armature métallique est liée au support métallique 108. Par le terme « liée », on entend que l'armature métallique peut être une pièce métallique soudée ou attachée au support métallique 108, ou bien que l'armature métallique peut faire partie intégrante du support métallique, c'est à dire que le support métallique 108 joue lui-même le rôle de l'armature métallique 109. Ainsi, sur la figure 2a, le support métallique 108 possède une partie rectiligne située en dessous du filament 105. Il joue ainsi le rôle de l'armature métallique 109 de la figure 1a. Pour que le support métallique 108 ne soit pas en contact avec la première extrémité 105a du filament 105, ce qui rendrait la lampe inopérante, le support métallique 108 possède un crochet 108c, comme il est indiqué sur la figure 2b, qui est une vue en coupe suivant l'axe YY. La figure 2c permet de comprendre comment un tel support métallique 108 joue le rôle d'une armature métallique responsable du court-circuit entraínant une rupture du filament. Lorsqu'un des enroulements, par exemple l'enroulement E, entre en contact avec le support métallique 108 en un point de contact P, comme le montre la figure 2c, le courant arrive par le deuxième fil conducteur 104, traverse le support métallique 108 jusqu'à ce point de contact P, puis traverse les enroulements E, F, G et H, pour enfin ressortir par le premier fil conducteur 103. Ainsi les enroulements A, B, C et D sont court-circuités et, pour des raisons identiques à celles décrites dans la description de la figure 1c, le filament se rompt.FIG. 2a illustrates a lamp according to a second embodiment particular of the invention. According to this embodiment, the metal frame is linked to the metal support 108. By the term “linked”, it is meant that the armature metal can be a metal part welded or attached to the metal support 108, or that the metal frame can be an integral part of the support metallic, that is to say that the metallic support 108 itself plays the role of the metal frame 109. Thus, in FIG. 2a, the metal support 108 has a straight part located below the filament 105. It thus plays the role of the metal frame 109 of FIG. 1a. So that the metal support 108 is not not in contact with the first end 105a of the filament 105, which would make the lamp inoperative, the metal support 108 has a hook 108c, as it is indicated in Figure 2b, which is a sectional view along the axis YY. Figure 2c makes it possible to understand how such a metallic support 108 plays the role of a metal reinforcement responsible for the short circuit resulting in rupture of the filament. When one of the windings, for example winding E, comes into contact with the metal support 108 at a contact point P, as shown in FIG. 2c, the current arrives via the second conducting wire 104, passes through the metal support 108 up to this point of contact P, then crosses the windings E, F, G and H, to finally come out through the first conducting wire 103. Thus the windings A, B, C and D are short-circuited and, for reasons identical to those described in the description of Figure 1c, the filament breaks.

Selon une variante de l'invention, la lampe comprend en outre au moins un support intermédiaire accroché à un enroulement dudit filamentAccording to a variant of the invention, the lamp further comprises at at least one intermediate support attached to a winding of said filament

La figure 3a illustre une lampe selon un premier mode de réalisation particulier de cette variante et la figure 3b est une coupe d'une telle lampe suivant un axe YY. Une telle lampe comprend, outre des éléments déjà décrits sur la figure la, un premier support intermédiaire 111 et un deuxième support intermédiaire 112, situés au dessus du filament 105. Ces deux supports intermédiaires assurent un bon maintien du filament 105 et diminuent son affaissement. De la sorte, la rupture du filament 105 provoquée par l'armature métallique 109 survient au bout d'un temps de fonctionnement de la lampe plus élevé qu'en l'absence de tels supports intermédiaires. Les supports intermédiaires 111 et 112 peuvent être encastrés dans le pont 110 ou dans le scellage de pincement 101. Ils peuvent avoir, comme indiqué sur la figure 3a, une extrémité en forme de crochet, ce qui rend leur installation dans la lampe particulièrement simple.FIG. 3a illustrates a lamp according to a first embodiment particular of this variant and Figure 3b is a section of such a lamp according to a YY axis. Such a lamp comprises, in addition to the elements already described in the figure 1a, a first intermediate support 111 and a second intermediate support 112, located above the filament 105. These two intermediate supports ensure good maintenance of the filament 105 and reduce its sagging. In this way, the rupture of the filament 105 caused by the metal frame 109 occurs after a time lamp operation higher than in the absence of such supports intermediate. Intermediate supports 111 and 112 can be built into bridge 110 or in pinch seal 101. They may have, as shown in FIG. 3a, a hook-shaped end, which makes their installation in the particularly simple lamp.

La figure 4a illustre une lampe selon un deuxième mode de réalisation particulier de cette variante et la figure 4b est une vue en coupe d'une telle lampe suivant l'axe YY. Selon ce mode de réalisation, l'armature métallique est liée à un des supports intermédiaires. Par le terme « liée », on entend que l'armature métallique peut être une pièce métallique soudée ou attachée à un support intermédiaire, ou bien que l'armature métallique peut faire partie intégrante d'un support intermédiaire, c'est à dire qu'un support intermédiaire joue lui-même le rôle de l'armature métallique 109. Ainsi, sur la figure 4a, le deuxième support intermédiaire 112 est prolongé par une partie métallique comprenant une partie rectiligne située en dessous du filament 105. Il joue ainsi le rôle de l'armature métallique 109 de la figure 1a. Bien entendu, le premier support intermédiaire 111 pourrait également jouer ce rôle. Le deuxième support intermédiaire 112 contourne le filament 105, comme on peut le voir sur la figure 4b, afin qu'il n'entre en contact avec le filament 105, en un point autre qu'au niveau de son crochet, que lorsque le filament 105 s'affaisse.FIG. 4a illustrates a lamp according to a second embodiment particular of this variant and Figure 4b is a sectional view of such a lamp along the YY axis. According to this embodiment, the metal frame is linked to a intermediate supports. By the term "linked" is meant that the armature metal can be a metal part welded or attached to a support intermediate, or that the metal reinforcement can be an integral part of a intermediate support, i.e. an intermediate support plays the role itself of the metal frame 109. Thus, in FIG. 4a, the second support intermediate 112 is extended by a metal part comprising a part straight below the filament 105. It thus plays the role of the armature metal 109 of Figure 1a. Of course, the first intermediate support 111 could also play this role. The second intermediate support 112 bypasses the filament 105, as can be seen in FIG. 4b, so that it does not come into contact with the filament 105, at a point other than at its hook, only when the filament 105 collapses.

La figure 4c permet de comprendre comment un tel support intermédiaire 112 joue le rôle d'une armature métallique responsable du court-circuit entraínant une rupture du filament. Lorsqu'un des enroulements, par exemple l'enroulement E, entre en contact avec le support intermédiaire 112 en un point de contact P, le courant arrive par le deuxième fil conducteur 104, traverse le support métallique 108, puis les enroulements A, B, C, D et E jusqu'au point de contact P, puis le deuxième support intermédiaire 112 jusqu'à son crochet, et enfin les enroulements G et H, pour ressortir par le premier fil conducteur 103. Ainsi l'enroulement F et une partie de l'enroulement E sont court-circuités et, pour des raisons identiques à celles décrites dans la description de la figure 1c, le filament 105 peut se rompre. Il faut noter que, dans un tel cas, l'échauffement provoqué par le court-circuit est moins important que dans un cas où on utilise l'armature métallique 109, par exemple dans la lampe de la figure 1a. En effet, un nombre moins important d'enroulements est court-circuité dans le cas de la figure 4c. Cependant, cet échauffement peut être suffisant pour provoquer la rupture du filament 105.Figure 4c shows how such a support intermediate 112 acts as a metal frame responsible for the short circuit causing a filament break. When one of the windings, for example the winding E, comes into contact with the intermediate support 112 at a point of contact P, the current arrives via the second conducting wire 104, crosses the support metallic 108, then the windings A, B, C, D and E to the point of contact P, then the second intermediate support 112 to its hook, and finally the windings G and H, to come out through the first conducting wire 103. Thus winding F and part of winding E are short-circuited and, for reasons identical to those described in the description of Figure 1c, the filament 105 may break. It should be noted that, in such a case, the heating caused by the short circuit is less important than in a case where the armature is used metallic 109, for example in the lamp of FIG. 1a. Indeed, a number less windings is short-circuited in the case of Figure 4c. However, this heating may be sufficient to cause the rupture of the filament 105.

La description ci-dessus en référence aux figures illustre l'invention plutôt qu'elle ne la limite. A cet égard, quelques remarques sont faites ci-dessous. Les figures 1a à 4c illustrent des exemples de mise en oeuvre de l'invention. Bien entendu, l'invention ne se limite pas à ces seuls exemples. D'autres types d'armatures métalliques peuvent être imaginés, dès lors que ces armatures sont capables de provoquer un court-circuit de certains enroulements du filament 105, afin d'éviter une explosion de la lampe en fin de vie de celle-ci. De la même façon, une armature métallique peut être reliée au filament 105 à d'autres endroits que ceux décrits dans ces figures. Par exemple, sur la figure la, l'armature métallique 109 peut être directement soudée ou attachée à la première extrémité 105a du filament 105, au lieu d'être soudée à la première patte métallique 106. Elle peut également être soudée ou attachée à un des enroulements du filament 105, par exemple l'enroulement H.The description above with reference to the figures illustrates the invention rather than limiting it. In this regard, some remarks are made below. Figures 1a to 4c illustrate examples of implementation of the invention. Well understood, the invention is not limited to these examples only. Other types metallic reinforcements can be imagined, since these reinforcements are capable of causing a short circuit in certain windings of the filament 105, in order to avoid an explosion of the lamp at the end of its life. In the same way, a metal frame can be connected to filament 105 in places other than those described in these figures. For example, in Figure la, the metal frame 109 can be directly welded or attached to the first end 105a of the filament 105, instead of being welded to the first metal tab 106. It can also be welded or attached to one of the filament windings 105, by example winding H.

Claims (6)

Lampe électrique incandescente comprenant : une ampoule (100) possédant un axe de révolution (102); un premier et un deuxième fil conducteur (103, 104) destinés à une alimentation en courant de ladite lampe ; un filament (105) présentant des enroulements (A à H) disposés en spirale autour d'un axe de révolution parallèle à l'axe de révolution de ladite ampoule et possédant une première et une deuxième extrémité (105a, 105b), la première extrémité dudit filament étant reliée au premier fil conducteur grâce à une première patte métallique (106) ; un support métallique (108) possédant une première et une deuxième extrémité (108a, 108b), la première extrémité dudit support métallique étant reliée au deuxième fil conducteur grâce à une deuxième patte métallique (107), la deuxième extrémité dudit support métallique étant reliée à la deuxième extrémité dudit filament ; caractérisée en ce que ladite lampe comprend une armature métallique en contact électrique avec une des extrémités ou un des enroulements dudit filament et comprenant une partie sensiblement rectiligne parallèle à l'axe de révolution dudit filament et située en dessous dudit filament lorsque la lampe se trouve dans des conditions normales de fonctionnement.Incandescent electric lamp comprising: a bulb (100) having an axis of revolution (102); first and second conductive wires (103, 104) for supplying power to said lamp; a filament (105) having windings (A to H) arranged in a spiral around an axis of revolution parallel to the axis of revolution of said bulb and having a first and a second end (105a, 105b), the first end said filament being connected to the first conducting wire by means of a first metallic tab (106); a metal support (108) having a first and a second end (108a, 108b), the first end of said metal support being connected to the second conductive wire by means of a second metal tab (107), the second end of said metal support being connected to the second end of said filament; characterized in that said lamp comprises a metal frame in electrical contact with one of the ends or one of the windings of said filament and comprising a substantially rectilinear part parallel to the axis of revolution of said filament and located below said filament when the lamp is in normal operating conditions. Lampe électrique incandescente selon la revendication 1, caractérisée en ce que ladite armature métallique est liée à la première patte métallique.Incandescent electric lamp according to claim 1, characterized in that said metal frame is linked to the first metal tab. Lampe électrique incandescente selon la revendication 1, caractérisée en ce que ladite armature métallique est liée au support métallique.Incandescent electric lamp according to claim 1, characterized in that said metal frame is linked to the metal support. Lampe électrique incandescente selon la revendication 1, caractérisée en ce qu'elle comprend en outre au moins un support intermédiaire (111, 112) accroché à un enroulement dudit filament.Incandescent electric lamp according to claim 1, characterized in that it further comprises at least one intermediate support (111, 112) attached to a winding of said filament. Lampe électrique incandescente selon la revendication 4, caractérisée en ce que le ou les supports intermédiaires sont situés au dessus du filament lorsque la lampe se trouve dans ses conditions normales de fonctionnement. Incandescent electric lamp according to claim 4, characterized in that the intermediate support or supports are located above the filament when the lamp is in its normal operating conditions. Lampe électrique incandescente selon la revendication 4, caractérisée en ce que ladite armature métallique est liée à un parmi les au moins un support intermédiaire.Incandescent electric lamp according to claim 4, characterized in that said metal frame is linked to one of the at least one intermediate support.
EP02078423A 2001-08-21 2002-08-19 Lamp with anti-explosion device Withdrawn EP1286384A1 (en)

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US20030062834A1 (en) 2003-04-03
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JP2003115284A (en) 2003-04-18
US7259515B2 (en) 2007-08-21
US20060006800A1 (en) 2006-01-12

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