EP0251372A2 - Electric incandescent lamp for series connection - Google Patents

Electric incandescent lamp for series connection Download PDF

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Publication number
EP0251372A2
EP0251372A2 EP87201097A EP87201097A EP0251372A2 EP 0251372 A2 EP0251372 A2 EP 0251372A2 EP 87201097 A EP87201097 A EP 87201097A EP 87201097 A EP87201097 A EP 87201097A EP 0251372 A2 EP0251372 A2 EP 0251372A2
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EP
European Patent Office
Prior art keywords
power supply
wire
supply wires
copper
mass
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.)
Granted
Application number
EP87201097A
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German (de)
French (fr)
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EP0251372A3 (en
EP0251372B1 (en
Inventor
Wolf-Dieter Bauch
Rolf Gervelmeyer
Heinz Dr. Merker
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Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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Publication of EP0251372A2 publication Critical patent/EP0251372A2/en
Publication of EP0251372A3 publication Critical patent/EP0251372A3/en
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Publication of EP0251372B1 publication Critical patent/EP0251372B1/en
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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

Definitions

  • the invention relates to an electric incandescent lamp for series connection with a translucent bulb, in which a filament is arranged between power supply wires which emerge through the wall of the bulb, in which bulb the power supply wires are connected to one another in an electrically insulating manner by a support member and the lamp is on Contains short-circuit element, which bridges the incandescent body and contains a glass mass in which metal powder is dispersed.
  • a lamp is known from GB-PS l0 77 863.
  • the short-circuit element In the case of lamps of this type, the short-circuit element must be practically impermeable to current at the operating voltage, but the overvoltage which occurs when the incandescent body burns while the lamp is operating in series connection becomes conductive.
  • the short-circuit element consists of a sintered mixture of glass powder and iron powder which is melted or sintered onto the power supply wires.
  • the mixture can be introduced into a hollow support member, itself designed as a support member or sintered on the outside of the lamp bulb.
  • This short-circuit element connecting the power supply wires initially acts as an insulator, but is said to break down when a high electrical voltage is applied and thus short-circuit the lamp when the incandescent body burns out.
  • incandescent lamp known from GB-PS 839 l60 with a short-circuit element made from a paste of copper powder, magnesium oxide and silicone resin, the proportion of magnesium oxide being 18 to 24% by weight of the copper proportion.
  • This organ is also non-conductive, but should become conductive when an overvoltage is applied.
  • the invention has for its object to provide an electric incandescent lamp of the type mentioned with a short-circuit element which responds reliably when the incandescent body burns through and bridges the lamp in an electrically conductive manner.
  • this lamp should also be easy to manufacture in mass production.
  • the electric incandescent lamp of the type mentioned at the outset according to the invention in that at least one of the power supply wires consists of nickel wire, copper wire or copper sheathed wire and the glass mass is a fused mass which is 50 to 70% by weight of glass and 30 to 50% by weight. % of copper powder dispersed therein and with the power supply wires is fused, wherein the aforementioned power supply wire has an oxide skin at its melting point in the glass mass, which breaks through when the incandescent body burns through.
  • the glass mass with copper powder dispersed in it is electrically conductive right from the start due to its high copper content.
  • the resistance to the direct passage of current is generated by the oxide skin located at the melting point on the power supply wire, the thickness and thus breakdown voltage of which can be controlled by the conditions during the melting.
  • This lamp has only one parameter that determines the breakdown voltage. All other known solutions, however, depend on several parameters and are therefore more vulnerable and more difficult to control from the outset.
  • both power supply wires consist of nickel wire, copper wire or copper sheath wire and have an oxide skin at their melting points.
  • the short-circuit element then comprises the already electrically conductive mass of fused glass and copper powder dispersed therein and the two initially non-conductive oxide skins.
  • the glass mass with copper powder of the incandescent lamp according to the invention dispersed therein can either be melted onto the support member holding the power supply wires, as the support member connecting the power supply wires in an electrically insulating manner, or can be fused to the bulb on the outside of the bulb.
  • a mixture of copper powder and glass powder can be pressed into a ring and sintered, after which the ring is attached to the support member provided with the power supply wires and melted until the ring material on the support member forms a connection between the power supply wires.
  • the short-circuit element can be produced on the outside of the piston.
  • the mass itself is to be designed as a support member for the power supply wires
  • a mixture of copper powder and glass powder can be pressed and sintered, whereupon the ring is placed on the power supply wires which are arranged at a distance from one another and then melted to form an electrically conductive support member.
  • Glass is advantageously chosen so that it does not soften at the operating temperature of the lamp, but is easy to process. Glasses with a melting point in the range of 500-600 ° C have proven to be advantageous.
  • the oxide skin on a power supply wire can be easily, e.g. when it melts into the glass mass.
  • the thickness of the oxide skin can be easily controlled by means of a protective gas jet directed at the melting point. A small number of attempts are sufficient to determine the conditions for obtaining a desired breakdown voltage.
  • both power supply wires can have an oxide skin at the melting point.
  • the lamps according to FIGS. 1 and 2 contain a translucent bulb 1 made of glass, in which a glow body 2 is arranged between power supply wires 3, which emerge through the wall of the bulb 1.
  • the power supply wires 3 are connected to one another in an electrically insulating manner by a support member 4.
  • the lamps contain a short-circuit element 5, which bridges the incandescent body 2 and contains a glass mass 5 with metal powder dispersed therein.
  • the lamps are each provided with a screw base 7, which is connected to the power supply wires 3.
  • the glass mass 6 is a fused mass which contains 50 to 70% by weight of glass and 30 to 50% by weight of copper powder dispersed therein and which is fused to the power supply wires 3.
  • the power supply wires 3 have an oxide skin 8 at their melting points in the glass mass 6, which breaks through when the incandescent body 2 burns through.
  • the glass mass 6 in FIG. 1 is a layer which is located on the support member 4; 2, the glass mass 6 itself forms the support member 4.
  • the glass mass 6 with the copper powder dispersed therein is already electrically conductive at the beginning of the life of the lamps.
  • the mass has a resistance of about 1 ohm.
  • the power supply wires 3 are connected to one another in an electrically insulating manner, since the Mass 6 attacks the oxide skin 8 of the wires 3.
  • the mass 6 contains 60.4% by weight of glass, for example lead borosilicate glass with a melting point of about 550 ° C., and 39.6% by weight of copper powder, for example powder with a particle size between 8 and 60 ⁇ m with 90% by weight between 8 and 40 ⁇ m.
  • the short-circuit element in these lamps consists of the mass 6 and the oxide skins 8. Due to these oxide skins 8, there is an electrically non-conductive connection between the power supply wires 3 at the beginning of the life of the lamps, but when the incandescent body 2 burns out during operation of the lamps in series connection, the full voltage, which leads the row, on the short-circuit element 6, 8. The oxide skins 8 break through and the short-circuit element 6, 8 becomes electrically conductive.
  • the thickness of the oxide skins is chosen so that the breakdown voltage of the short-circuit element is between 50 and 200 V. In the exemplary embodiments described, the thickness of the oxide skins is 4 ⁇ m.
  • the lamp according to the invention has proven to be very reliable and easy to manufacture.
  • Composition 6 can be made by adding 58% by weight glass powder, 38% by weight copper powder and 4% by weight binder, e.g. Acrylic resin, mixed and pressed into rings.
  • the rings can be sintered for solidification, e.g. for 20 seconds at 625 - 635 ° C. During this and when the rings fuse with the power supply wires, the binder decomposes and the decomposition products escape.
  • the thickness of the oxide skins 8 is during the melting process by blowing with a protective gas, e.g. Nitrogen, can be influenced.

Abstract

Die elektrische Lampe für Reihenschaltung enthält mindestens einen Stromzuführungsdraht (3) aus Nickeldraht, Kupferdraht oder Kupfermanteldraht. Ein Kurzschlußorgan (5) ist vorgesehen, das aus einer Glasmasse (6), in der Kupferpulver dispergiert und die mit den Stromzuführungsdrähten (3) verschmolzen ist, und aus einer Oxidhaut (8) besteht, die an der Einschmelzstelle in der Masse (6) auf dem Stromzuführungsdraht vorhanden ist. Die Glasmasse (6) ist elektrisch leitend. Eine elektrische Verbindung zwischen den Stromzuführungsdrähten (3) entsteht aber erst, wenn der Glühkörper (2) durchbrennt und die Oxidhaut (8) durch die dann auftretende Überspannung durchschlägt.The electric lamp for series connection contains at least one power supply wire (3) made of nickel wire, copper wire or copper sheath wire. A short-circuit element (5) is provided which consists of a glass mass (6) in which copper powder is dispersed and which is fused to the power supply wires (3), and consists of an oxide skin (8) which is at the melting point in the mass (6) is present on the power supply wire. The glass mass (6) is electrically conductive. However, an electrical connection between the power supply wires (3) only arises when the incandescent body (2) burns out and the oxide skin (8) breaks through due to the overvoltage that then occurs.

Description

Die Erfindung bezieht sich auf eine elektrische Glühlampe für Reihenschaltung mit einem lichtdurchlässigen Kolben, in dem ein Glühkörper zwischen Stromzuführungsdrähten angeordnet ist, die durch die Wand des Kolbens heraus­treten, wobei in diesem Kolben die Stromzuführungsdrähte durch ein Stützorgan elektrisch isolierend miteinander verbunden sind und die Lampe ein Kurzschlußorgan enthält, das den Glühkörper überbrückt und eine Glasmasse enthält, in der Metallpulver dispergiert ist. Eine derartige Lampe ist aus der GB-PS l0 77 863 bekannt.The invention relates to an electric incandescent lamp for series connection with a translucent bulb, in which a filament is arranged between power supply wires which emerge through the wall of the bulb, in which bulb the power supply wires are connected to one another in an electrically insulating manner by a support member and the lamp is on Contains short-circuit element, which bridges the incandescent body and contains a glass mass in which metal powder is dispersed. Such a lamp is known from GB-PS l0 77 863.

Bei derartigen Lampen muß das Kurzschlußorgan bei Betriebsspannung praktisch stromundurchlässig sein, bei der beim Durchbrennen des Glühkörpers im Betrieb der Lampe in Reihenschaltung auftretenden Überspannung jedoch strom­leitend werden.In the case of lamps of this type, the short-circuit element must be practically impermeable to current at the operating voltage, but the overvoltage which occurs when the incandescent body burns while the lamp is operating in series connection becomes conductive.

Bei der aus der GB-PS l0 77 863 bekannten Glühlampe besteht das Kurzschlußorgan aus einer gesinterten Mischung von Glaspulver und Eisenpulver, die an den Strom­zuführungsdrähten angeschmolzen oder angesintert ist. Die Mischung kann in ein hohles Stützorgan eingebracht, selbst als Stützorgan ausgebildet oder an der Außenseite des Lampenkolbens angesintert sein. Dieses die Strom­zuführungsdrähte verbindende Kurzschlußorgan wirkt zunächst als Isolator, soll jedoch bei Anlegen einer hohen elektrischen Spannung durchschlagen und somit die Lampe beim Durchbrennen des Glühkörpers kurzschließen. Der Durchschlag, der bei Überspannung in diesem Kurzschluß­organ auftreten soll, ist von schwer kontrollierbaren Größen, wie Mischung der Pulver, Korngrößenverteilung, Anschmelzung oder Ansinterung an den Stromzuführungs­drähten, Feuchtigkeitsgehalt bei der Fertigung der Lampe usw. stark abhängig. Deshalb läßt sich ein zuverlässiges Kurzschlußorgan nur sehr schwer herstellen.In the incandescent lamp known from GB-PS l0 77 863, the short-circuit element consists of a sintered mixture of glass powder and iron powder which is melted or sintered onto the power supply wires. The mixture can be introduced into a hollow support member, itself designed as a support member or sintered on the outside of the lamp bulb. This short-circuit element connecting the power supply wires initially acts as an insulator, but is said to break down when a high electrical voltage is applied and thus short-circuit the lamp when the incandescent body burns out. The breakdown that is to occur in this short-circuit element in the event of overvoltage is difficult to control Sizes such as mixture of the powders, particle size distribution, melting or sintering on the power supply wires, moisture content in the manufacture of the lamp, etc. strongly dependent. It is therefore very difficult to manufacture a reliable short-circuit element.

In der GB-PS l0 77 863 ist ferner ein Kurzschlußorgan für elektrische Glühlampen für Reihenschaltung erwähnt, das aus Kupferoxidpulver und Glaspulver besteht. Auch dieses Organ ist im Normalzustand nichtleitend und soll erst bei Anlegen von Überspannung leitend werden. Es hat sich in der Praxis herausgestellt, daß auch dieses Organ nicht zuverlässig arbeitet.In GB-PS l0 77 863 a short-circuit element for electric light bulbs for series connection is also mentioned, which consists of copper oxide powder and glass powder. This organ is also non-conductive in the normal state and should only become conductive when an overvoltage is applied. It has been found in practice that this organ does not work reliably either.

Dasselbe gilt für eine aus der GB-PS 839 l60 bekannte Glühlampe mit einem Kurzschlußorgan aus einer Paste aus Kupferpulver, Magnesiumoxid und Silikonharz, wobei der Anteil an Magnesiumoxid l8 bis 24 Gew.% des Kupferanteils beträgt. Auch dieses Organ ist nichtleitend, soll aber bei Anlegen einer Überspannung leitend werden.The same applies to an incandescent lamp known from GB-PS 839 l60 with a short-circuit element made from a paste of copper powder, magnesium oxide and silicone resin, the proportion of magnesium oxide being 18 to 24% by weight of the copper proportion. This organ is also non-conductive, but should become conductive when an overvoltage is applied.

Der Erfindung liegt die Aufgabe zugrunde, eine elektrische Glühlampe der eingangs erwähnten Art mit einem Kurzschluß­organ zu schaffen, das zuverlässig beim Durchbrennen des Glühkörpers anspricht und die Lampe elektrisch leitend überbrückt. Darüber hinaus soll diese Lampe auch in einer Massenfertigung leicht herstellbar sein.The invention has for its object to provide an electric incandescent lamp of the type mentioned with a short-circuit element which responds reliably when the incandescent body burns through and bridges the lamp in an electrically conductive manner. In addition, this lamp should also be easy to manufacture in mass production.

Diese Aufgabe wird bei der elektrischen Glühlampe eingangs erwähnter Art gemäß der Erfindung dadurch gelöst, daß mindestens einer der Stromzuführungsdrähte aus Nickel­draht, Kupferdraht oder Kupfermanteldraht besteht und die Glasmasse eine verschmolzene Masse ist, die 50 bis 70 Gew.% Glas und 30 bis 50 Gew.% darin dispergiertes Kupferpulver enthält und mit den Stromzuführungsdrähten verschmolzen ist, wobei der erwähnte Stromzuführungsdraht an seiner Einschmelzstelle in der Glasmasse eine Oxidhaut hat, die beim Durchbrennen des Glühkörpers durchschlägt.This object is achieved with the electric incandescent lamp of the type mentioned at the outset according to the invention in that at least one of the power supply wires consists of nickel wire, copper wire or copper sheathed wire and the glass mass is a fused mass which is 50 to 70% by weight of glass and 30 to 50% by weight. % of copper powder dispersed therein and with the power supply wires is fused, wherein the aforementioned power supply wire has an oxide skin at its melting point in the glass mass, which breaks through when the incandescent body burns through.

Hierbei ist die Glasmasse mit darin dispergiertem Kupfer­pulver wegen ihres hohen Gehalts an Kupfer schon von Anfang an elektrisch leitend. Bei dieser Lampe wird der Widerstand gegen den direkten Stromdurchgang durch die an der Einschmelzstelle auf dem Stromzuführungsdraht befind­liche Oxidhaut erzeugt, deren Dicke und damit Durchschlag­spannung sich durch die Bedingungen bei der Einschmelzung steuern läßt. Man hat bei dieser Lampe also nur einen einzigen Parameter, der die Durchschlagspannung bestimmt. Alle anderen bekannten Lösungen sind dagegen von mehreren Parametern abhängig und damit von vornherein stärker gefährdet und schwerer kontrollierbar.Here, the glass mass with copper powder dispersed in it is electrically conductive right from the start due to its high copper content. With this lamp, the resistance to the direct passage of current is generated by the oxide skin located at the melting point on the power supply wire, the thickness and thus breakdown voltage of which can be controlled by the conditions during the melting. This lamp has only one parameter that determines the breakdown voltage. All other known solutions, however, depend on several parameters and are therefore more vulnerable and more difficult to control from the outset.

Es ist vorteilhaft, daß beide Stromzuführungsdrähte aus Nickeldraht, Kupferdraht oder Kupfermanteldraht bestehen und an ihren Einschmelzstellen eine Oxidhaut besitzen. Das Kurzschlußorgan umfaßt dann die bereits anfänglich elektrisch leitende Masse aus verschmolzenem Glas und darin dispergiertem Kupferpulver und die beiden anfänglich nichtleitenden Oxidhäute.It is advantageous that both power supply wires consist of nickel wire, copper wire or copper sheath wire and have an oxide skin at their melting points. The short-circuit element then comprises the already electrically conductive mass of fused glass and copper powder dispersed therein and the two initially non-conductive oxide skins.

Die Glasmasse mit darin dispergiertem Kupferpulver der Glühlampe nach der Erfindung kann entweder auf das die Stromzuführungsdrähte halternde Stützorgan aufgeschmolzen, als das die Stromzuführungsdrähte elektrisch isolierend verbindende Stützorgan ausgebildet oder an der Außenseite des Kolbens mit dem Kolben verschmolzen sein.The glass mass with copper powder of the incandescent lamp according to the invention dispersed therein can either be melted onto the support member holding the power supply wires, as the support member connecting the power supply wires in an electrically insulating manner, or can be fused to the bulb on the outside of the bulb.

Wenn die Masse auf ein Stützorgan aufgeschmolzen werden muß, kann ein Gemisch von Kupferpulver und Glaspulver zu einem Ring gepreßt und gesintert werden, worauf der Ring auf dem mit den Stromzuführungsdrähten versehenen Stütz­organ angebracht und aufgeschmolzen wird, bis das Ring­material auf dem Stützorgan eine Verbindung zwischen den Stromzuführungsdrähten bildet. Auf ähnliche Weise kann das Kurzschlußorgan an der Außenseite des Kolbens hergestellt werden.If the mass has to be melted onto a support member, a mixture of copper powder and glass powder can be pressed into a ring and sintered, after which the ring is attached to the support member provided with the power supply wires and melted until the ring material on the support member forms a connection between the power supply wires. In a similar way, the short-circuit element can be produced on the outside of the piston.

Soll die Masse selbst als Stützorgan für die Strom­zuführungsdrähte ausgebildet sein, so kann ein Gemisch von Kupferpulver und Glaspulver zu einem Ring gepreßt und gesintert werden, worauf der Ring auf die im Abstand voneinander angeordneten Stromzuführungsdrähte gebracht und anschließend zu einem elektrisch leitenden Stützorgan geschmolzen wird.If the mass itself is to be designed as a support member for the power supply wires, a mixture of copper powder and glass powder can be pressed and sintered, whereupon the ring is placed on the power supply wires which are arranged at a distance from one another and then melted to form an electrically conductive support member.

Vorteilhaft wird en Glas gewählt, daß bei der Betriebs­temperatur der Lampe nicht erweicht, sich aber einfach verarbeiten läßt. Gläser mit einem Schmelzpunkt im Bereich von 500 - 600°C haben sich als vorteilhaft erwiesen.Glass is advantageously chosen so that it does not soften at the operating temperature of the lamp, but is easy to process. Glasses with a melting point in the range of 500-600 ° C have proven to be advantageous.

Die Oxidhaut auf einem Stromzuführungsdraht läßt sich einfach, z.B. bei der Einschmelzung in die Glasmasse, erzeugen. Die Dicke der Oxidhaut läßt sich einfach mittels eines auf die Einschmelzstelle gerichteten Schutzgas­strahls steuern. Eine geringe Anzahl von Versuchen genügt bereits, die Bedingungen zum Erhalten einer gewünschten Durchschlagspannung zu ermitteln. Statt eines können beide Stromzuführungsdrähte an der Einschmelzstelle eine Oxid­haut aufweisen.The oxide skin on a power supply wire can be easily, e.g. when it melts into the glass mass. The thickness of the oxide skin can be easily controlled by means of a protective gas jet directed at the melting point. A small number of attempts are sufficient to determine the conditions for obtaining a desired breakdown voltage. Instead of one, both power supply wires can have an oxide skin at the melting point.

Ausführungsbeispiele der Lampe nach der Erfindung werden nachstehend anhand der Zeichnung erläutert. Es zeigen:

  • Fig. l eine erste Lampe in Seitenansicht,
  • Fig. 2 eine zweite Lampe in Seitenansicht.
Embodiments of the lamp according to the invention are explained below with reference to the drawing. Show it:
  • 1 shows a first lamp in side view,
  • Fig. 2 shows a second lamp in side view.

Die Lampen nach Fig. l und 2 enthalten einen lichtdurch­lässigen Kolben l aus Glas, in dem ein Glühkörper 2 zwschen Stromzuführungsdrähten 3 angeordnet ist, die durch die Wand des Kolbens l heraustreten. Im Kolben l sind die Stromzuführungsdrähte 3 durch ein Stützorgan 4 elektrisch isolierend miteinander verbunden. Die Lampen enthalten ein Kurzschlußorgan 5, das den Glühkörper 2 überbrückt und eine Glasmasse 5 mit darin dispergiertem Metallpulver enthält. Die Lampen sind mit je einem Schraubsockel 7 versehen, der mit den Stromzuführungs­drähten 3 verbunden ist.The lamps according to FIGS. 1 and 2 contain a translucent bulb 1 made of glass, in which a glow body 2 is arranged between power supply wires 3, which emerge through the wall of the bulb 1. In the piston 1, the power supply wires 3 are connected to one another in an electrically insulating manner by a support member 4. The lamps contain a short-circuit element 5, which bridges the incandescent body 2 and contains a glass mass 5 with metal powder dispersed therein. The lamps are each provided with a screw base 7, which is connected to the power supply wires 3.

Die Lampen nach Fig. l und 2 enthalten Stromzuführungs­drähte 3, die aus Nickeldraht, Kupferdraht oder Kupfer­manteldraht bestehen. Die Glasmasse 6 ist eine ver­schmolzene Masse, die 50 bis 70 Gew.% Glas und 30 bis 50 Gew.% darin dispergiertes Kupferpulver enthält und mit den Stromzuführungsdrähten 3 verschmolzen ist. Die Strom­zuführungsdrähte 3 besitzen an ihren Einschmelzstellen in der Glasmasse 6 eine Oxidhaut 8, die beim Durchbrennen des Glühkörpers 2 durchschlägt.1 and 2 contain power supply wires 3, which consist of nickel wire, copper wire or copper sheathed wire. The glass mass 6 is a fused mass which contains 50 to 70% by weight of glass and 30 to 50% by weight of copper powder dispersed therein and which is fused to the power supply wires 3. The power supply wires 3 have an oxide skin 8 at their melting points in the glass mass 6, which breaks through when the incandescent body 2 burns through.

Die Glasmasse 6 ist in Fig. l eine Schicht, die sich auf dem Stützorgan 4 befindet; in Fig. 2 bildet die Glas­masse 6 selbst das Stützorgan 4.The glass mass 6 in FIG. 1 is a layer which is located on the support member 4; 2, the glass mass 6 itself forms the support member 4.

Die Glasmasse 6 mit dem darin dispergiertem Kupferpulver ist bereits beim Beginn der Lebensdauer der Lampen elektrisch leitend. Die Masse hat einen Widerstand von etwa l Ohm. Dennoch sind die Stromzuführungsdrähte 3 elektrisch isolierend miteinander verbunden, da die Masse 6 bei der Oxidhaut 8 der Drähte 3 angreift. Die Masse 6 enthält 60,4 Gew.% Glas, z.B. Bleiborosilikatglas mit einem Schmelzpunkt von etwa 550°C, und 39,6 Gew.% Kupferpulver, z.B. Pulver mit einer Korngröße zwischen 8 und 60 µm mit 90 Gew.% zwischen 8 und 40 µm.The glass mass 6 with the copper powder dispersed therein is already electrically conductive at the beginning of the life of the lamps. The mass has a resistance of about 1 ohm. Nevertheless, the power supply wires 3 are connected to one another in an electrically insulating manner, since the Mass 6 attacks the oxide skin 8 of the wires 3. The mass 6 contains 60.4% by weight of glass, for example lead borosilicate glass with a melting point of about 550 ° C., and 39.6% by weight of copper powder, for example powder with a particle size between 8 and 60 μm with 90% by weight between 8 and 40 µm.

Das Kurzschlußorgan besteht bei diesen Lampen aus der Masse 6 und den Oxidhäuten 8. Durch diese Oxidhäute 8 gibt es beim Beginn der Lebensdauer der Lampen eine elektrisch nichtleitende Verbindung zwischen den Stromzuführungs­drähten 3, aber bem Durchbrennen des Glühkörpers 2 im Betrieb der Lampen in Reihenschaltung liegt die volle Spannung, die die Reihe führt, am Kurzschlußorgan 6, 8. Die Oxidhäute 8 schlagen durch und das Kurzschluß­organ 6, 8 wird elektrisch leitend.The short-circuit element in these lamps consists of the mass 6 and the oxide skins 8. Due to these oxide skins 8, there is an electrically non-conductive connection between the power supply wires 3 at the beginning of the life of the lamps, but when the incandescent body 2 burns out during operation of the lamps in series connection, the full voltage, which leads the row, on the short-circuit element 6, 8. The oxide skins 8 break through and the short-circuit element 6, 8 becomes electrically conductive.

Die Dicke der Oxidhäute ist so gewählt, daß das die Durch­schlagspannung des Kurzschlußorgans zwischen 50 und 200 V beträgt. In den beschriebenen Ausführungsbeispielen ist die Dicke der Oxidhäute 4 µm.The thickness of the oxide skins is chosen so that the breakdown voltage of the short-circuit element is between 50 and 200 V. In the exemplary embodiments described, the thickness of the oxide skins is 4 μm.

Die Lampe nach der Erfindung hat sich als sehr zuverlässig und als einfach herstellbar erwiesen.The lamp according to the invention has proven to be very reliable and easy to manufacture.

Die Masse 6 kann hergestellt werden, indem 58 Gew.% Glas­pulver, 38 Gew.% Kupferpulver und 4 Gew.% Bindemittel, z.B. Acrylatharz, gemischt und zu Ringen gepreßt werden. Zur Verfestigung können die Ringe gesintert werden, z.B. während 20 Sekunden bei 625 - 635°C. Dabei und bei der Verschmelzung der Ringe mit den Stromzuführungsdrähten zersetzt sich das Bindemittel und entweichen die Zersetzungsprodukte. Die Dicke der Oxidhäute 8 ist während des Einschmelzverfahrens durch Anblasen mit einem Schutz­gas, z.B. Stickstoff, beeinflußbar.Composition 6 can be made by adding 58% by weight glass powder, 38% by weight copper powder and 4% by weight binder, e.g. Acrylic resin, mixed and pressed into rings. The rings can be sintered for solidification, e.g. for 20 seconds at 625 - 635 ° C. During this and when the rings fuse with the power supply wires, the binder decomposes and the decomposition products escape. The thickness of the oxide skins 8 is during the melting process by blowing with a protective gas, e.g. Nitrogen, can be influenced.

Claims (4)

1. Elektrische Glühlampe für Reihenschaltung mit einem lichtdurchlässigen Kolben, in dem ein Glühkörper zwischen Stromzuführungsdrähten angeordnet ist, die durch die Wand des Kolbens heraustreten, wobei in diesem Kolben die Stromzuführungsdrähte durch ein Stützorgan elektrisch isolierend miteinander verbunden sind und die Lampe ein Kurzschlußorgan enthält, das den Glühkörper überbrückt und eine Glasmasse enthält, in der Metallpulver dispergiert ist, dadurch gekennzeichnet, daß mindestens einer der Stromzuführungsdrähte aus Nickeldraht, Kupferdraht oder Kupfermanteldraht besteht und die Glasmasse eine ver­schmolzene Masse ist, die 50 bis 70 Gew.% Glas und 30 bis 50 Gew.% darin dispergiertes Kupferpulver enthält und mit dem Stromzuführungsdrähten verschmolzen ist, wobei der erwähnte Stromzuführungsdraht an seiner Einschmelzstelle in der Glasmasse eine Oxidhaut hat, die beim Durchbrennen des Glühkörpers durchschlägt.1. Electric incandescent lamp for series connection with a translucent bulb, in which a filament is arranged between power supply wires that emerge through the wall of the bulb, in which bulb the power supply wires are electrically insulated by a support member and the lamp contains a short-circuit member that bridges the incandescent body and contains a glass mass in which metal powder is dispersed, characterized in that at least one of the power supply wires consists of nickel wire, copper wire or copper sheathed wire and the glass mass is a fused mass which is 50 to 70 wt.% glass and 30 to 50 wt % contains copper powder dispersed therein and is fused to the power supply wires, the power supply wire mentioned having at its melting point in the glass mass an oxide skin which breaks through when the incandescent body burns through. 2 Elektrische Glühlampe nach Anspruch l, dadurch gekennzeichnet, daß beide Stromzuführungsdrähte aus Nickeldraht, Kupferdraht oder Kupfermanteldraht bestehen.2 Electric incandescent lamp according to claim l, characterized in that both power supply wires consist of nickel wire, copper wire or copper sheathed wire. 3. Elektrische Glühlampe nach Anspruch l oder 2, dadurch gekennzeichnet, daß die Glasmasse auf das Stütz­organ aufgeschmolzen ist.3. Electric light bulb according to claim l or 2, characterized in that the glass mass is melted onto the support member. 4. Elektrische Glühlampe nach Anspruch l oder 2, dadurch gekennzeichnet, daß die Glasmasse das Stützorgan bildet.4. Electric light bulb according to claim l or 2, characterized in that the glass mass forms the support member.
EP87201097A 1986-06-18 1987-06-11 Electric incandescent lamp for series connection Expired - Lifetime EP0251372B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3620373 1986-06-18
DE19863620373 DE3620373A1 (en) 1986-06-18 1986-06-18 ELECTRIC BULB FOR SERIES CIRCUIT AND METHOD FOR THEIR PRODUCTION

Publications (3)

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EP0251372A2 true EP0251372A2 (en) 1988-01-07
EP0251372A3 EP0251372A3 (en) 1989-11-23
EP0251372B1 EP0251372B1 (en) 1993-04-28

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EP87201097A Expired - Lifetime EP0251372B1 (en) 1986-06-18 1987-06-11 Electric incandescent lamp for series connection

Country Status (5)

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US (1) US4808885A (en)
EP (1) EP0251372B1 (en)
JP (1) JPH0719586B2 (en)
CA (1) CA1291204C (en)
DE (2) DE3620373A1 (en)

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Also Published As

Publication number Publication date
DE3620373A1 (en) 1987-12-23
CA1291204C (en) 1991-10-22
JPS632245A (en) 1988-01-07
JPH0719586B2 (en) 1995-03-06
EP0251372A3 (en) 1989-11-23
DE3785607D1 (en) 1993-06-03
EP0251372B1 (en) 1993-04-28
US4808885A (en) 1989-02-28

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