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EP0123844A2 - Low-voltage halogen projection incandescent lamp - Google Patents

Low-voltage halogen projection incandescent lamp Download PDF

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Publication number
EP0123844A2
EP0123844A2 EP84102813A EP84102813A EP0123844A2 EP 0123844 A2 EP0123844 A2 EP 0123844A2 EP 84102813 A EP84102813 A EP 84102813A EP 84102813 A EP84102813 A EP 84102813A EP 0123844 A2 EP0123844 A2 EP 0123844A2
Authority
EP
European Patent Office
Prior art keywords
filament
pitch
coil
helix
incandescent lamp
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
EP84102813A
Other languages
German (de)
French (fr)
Other versions
EP0123844B1 (en
EP0123844A3 (en
Inventor
Axel Bunk
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP0123844A2 publication Critical patent/EP0123844A2/en
Publication of EP0123844A3 publication Critical patent/EP0123844A3/en
Application granted granted Critical
Publication of EP0123844B1 publication Critical patent/EP0123844B1/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/02—Incandescent bodies
    • H01K1/14—Incandescent bodies characterised by the shape

Definitions

  • the invention relates to a low-voltage halogen projection light bulb with a filament filament made of tungsten.
  • a filament filament made of tungsten.
  • the object of the invention is to provide a lamp according to the preamble of claim 1, which has a temperature distribution along the filament, which allows the desired increase in luminous flux without problems.
  • the low-voltage halogen projection light bulb (FIG. 1) has a bulb 1 made of quartz or Vycor e , is filled with inert gas with halogen addition, has a pump tip 2 at one end and is closed by squeezing at the other end.
  • a coiled filament 3 made of tungsten (FIGS. 2, 3) is carried by tungsten current feeds 4, which are welded to molybdenum foils 5 and connected to external current feed pins 6 via these.
  • the filament filament 3 can be used as Flat core or round core helix.
  • the slope of the filament filament 3 is dimensioned such that it is smaller at the filament ends than in the filament middle part.
  • the value of the helix pitch of the helical central portion a M M is taken from the area 1,4 ⁇ a M ⁇ 2,2.
  • the helix pitch can increase either gradually or continuously from the helix ends to the helix center.
  • a more uniform temperature curve along the filament (curve 1) compared to the temperature curve with constant filament pitch (curve 2) results, as shown in FIG. 4, whose abscissa represents the number of turns W and the ordinate represents the filament temperature T.
  • the switch-on strength criterion is informal.

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  • Resistance Heating (AREA)

Abstract

1. An incandescent lamp comprising a coiled luminous element made of tungsten, whose coil pitch aE at the coil ends (E1 , E2 ) is smaller than the coil pitch (aM ) in the region of the coil centre (M), characterised in that the incandescent lamp is a low voltage halogen projection incandescent lamp whose luminous element, which is subject to a high thermal load, has a temperature which is close to the melting temperature of tungsten during the switch-on phase and whose coil pitch relative to the coil diameter lies within the range 1.2 =< aE =< 1.7 at the coil ends (E1 , E2 ) and within the range 1.4 =< aM =< 2.2 at the coil centre (M).

Description

Die Erfindung betrifft eine Niedervolt-Halogen-Projektionsglühlampe mit einer Leuchtkörperwendel aus Wolfram. Bei diesen hochbelasteten Lampen, bei denen man sich beim Einschalten bereits nahe der Schmelztemperatur des Wolframs bewegt, tritt die Frage der Einschaltfestigkeit, welche dadurch definiert ist, daß beim Einschalten mit 110 % Nennspannung die Lampe nicht durchbrennen darf, kritisch in Erscheinung.The invention relates to a low-voltage halogen projection light bulb with a filament filament made of tungsten. In the case of these highly loaded lamps, in which one moves close to the melting temperature of the tungsten when switched on, the question of the switch-on strength, which is defined by the fact that the lamp must not burn out when switched on with 110% nominal voltage, appears critically.

Bei den bekannten Lampen ist deren Leuchtkörperwendel, die entweder als Flachkern- oder Rundkernwendel ausgeführt ist und aus relativ dickem Draht besteht und nur wenige Windungen aufweist, mit konstanter Steigung gewickelt. Dies führt während der Einschaltphase zu einer Temperaturverteilung längs der Wendel mit einem Temperaturmaximum von etwa 3550 K im Wendelmittelteil, das bereits sehr nahe der Schmelztemperatur von 3680 K des Wolframs liegt.In the known lamps, their filament filament, which is designed either as a flat core or round core filament and consists of relatively thick wire and has only a few turns, is wound with a constant pitch. During the switch-on phase, this leads to a temperature distribution along the coil with a temperature maximum of approximately 3550 K in the middle part of the coil, which is already very close to the melting temperature of 3680 K of the tungsten.

Es besteht der Wunsch, den Lichtstrom der bekannten Lampen anzuheben. Dem steht hindernd gegenüber, daß dann während der Einschaltphase der Temperaturwert im Wendelmittelteil der Schmelztemperatur des Wolframs gleichkommt und die Lampe durchbrennt. Gelingt es jedoch, die Temperaturverteilung längs der Wendel gleichmäßiger zu gestalten, d.h. das Temperaturmaximum gewissermaßen "einzuebnen", käme das bei konstantem Lichtstrom insgesamt einer Vergrößerung des derzeitigen Abstandes der Leuchtkörpertemperatur von der Schmelztemperatur des Leuchtkörpermaterials gleich und eröffnete den Übergang zu höherer Wendelbelastung als bisher, ohne Gefahr des Durchbrennens der Wendel beim Einschalten.There is a desire to increase the luminous flux of the known lamps. This is hampered by the fact that during the switch-on phase the temperature value in the central part of the filament equals the melting temperature of the tungsten and the lamp burns out. If, however, it is possible to make the temperature distribution along the filament more uniform, that is to say "to level" the temperature maximum to a certain extent, this would result in an overall increase in the current distance between the filament temperature and the enamel with constant luminous flux temperature of the filament material equal and opened the transition to higher filament load than before, without the risk of the filament burning when switched on.

Aufgabe der Erfindung ist es, eine Lampe nach dem Oberbegriff des Anspruchs 1 zu schaffen, die eine Temperaturverteilung längs der Wendel aufweist, die die gewünschte Lichtstromerhöhung problemlos zuläßt.The object of the invention is to provide a lamp according to the preamble of claim 1, which has a temperature distribution along the filament, which allows the desired increase in luminous flux without problems.

Die gestellte Aufgabe wird durch die im Kennzeichen des Anspruchs 1 aufgeführten Merkmale gelöst.The object is achieved by the features listed in the characterizing part of claim 1.

Die Lampe wird im nachfolgenden näher beschrieben. Von den Figuren zeigen

  • Figur 1 die Niedervolt-Halogen-Projektionsglühlampe schematisch im Schnitt
  • Figur 2 eine Flachkernwendel in Seitenansicht
  • Figur 3 eine Flachkernwendel mit den verschiedenen Steigungsabschnitten
  • Figur 4 den Temperaturverlauf längs der Wendel
The lamp is described in more detail below. Show from the figures
  • Figure 1 shows the low-voltage halogen projection lamp schematically in section
  • Figure 2 is a flat core coil in side view
  • Figure 3 shows a flat core spiral with the different slope sections
  • Figure 4 shows the temperature profile along the coil

Die Niedervolt-Halogen-Projektionsglühlampe (Figur 1) besitzt einen Kolben 1 aus Quarz bzw. Vycore, ist mit Inertgas mit Halogenzusatz gefüllt, weist an einem Ende eine Pumpspitze 2 auf und ist am anderen Ende durch Quetschen verschlossen. Ein gewendelter Leuchtkörper 3 aus Wolfram (Figuren 2, 3) wird getragen von Wolframstromzuführungen 4, die an Molybdänfolien 5 angeschweißt und über diese mit Außenstromzuführungsstiften 6 verbunden sind. Die Leuchtkörperwendel 3 kann als Flachkern- oder Rundkernwendel ausgeführt sein. Die Steigung der Leuchtkörperwendel 3 ist so bemessen, daß sie an den Wendelenden kleiner als im Wendelmittelteil ist. Während die Wendelsteigung aE der Wendelenden E1, E2 im Bereich 1,2≤aE ≤1,7 liegt, ist der Wert für die Wendelsteigung aM des Wendelmittelteils M dem Bereich 1,4≤aM≤2,2 entnommen. Dabei kann die Wendelsteigung von den Wendelenden zur Wendelmitte hin entweder schrittweise oder kontinuierlich ansteigen. Ein längs der Wendel gleichmäßigerer Temperaturverlauf (Kurve 1) gegenüber dem Temperaturverlauf bei konstanter Wendelsteigung (Kurve 2) resultiert, wie Figur 4 zeigt, deren Abszisse die Windungszahl W und deren Ordinate die Leuchtkörpertemperatur T wiedergibt.The low-voltage halogen projection light bulb (FIG. 1) has a bulb 1 made of quartz or Vycor e , is filled with inert gas with halogen addition, has a pump tip 2 at one end and is closed by squeezing at the other end. A coiled filament 3 made of tungsten (FIGS. 2, 3) is carried by tungsten current feeds 4, which are welded to molybdenum foils 5 and connected to external current feed pins 6 via these. The filament filament 3 can be used as Flat core or round core helix. The slope of the filament filament 3 is dimensioned such that it is smaller at the filament ends than in the filament middle part. While the helical pitch of the coil ends a E E 1, E2 in the region E is 1,2≤a ≤1,7, the value of the helix pitch of the helical central portion a M M is taken from the area 1,4≤a M ≤2,2. The helix pitch can increase either gradually or continuously from the helix ends to the helix center. A more uniform temperature curve along the filament (curve 1) compared to the temperature curve with constant filament pitch (curve 2) results, as shown in FIG. 4, whose abscissa represents the number of turns W and the ordinate represents the filament temperature T.

Die Abweichung - maximale Temperatur zu minimaler Temperatur längs der Wendel - liegt bei etwa Δ T≤150 K im Gegensatz zu bisher 4 T = 250 K, womit sich eine Erhöhung des Lichtstromes um etwa 10% (schraffiertes Gebiet in Figur 4) bei Beibehalten des Einschaltfestigkeitskriteriums zwanglos ergibt.The deviation - maximum temperature to minimum temperature along the filament - is about Δ T≤150 K in contrast to 4 T = 250 K, which increases the luminous flux by about 10% (hatched area in Figure 4) while maintaining the The switch-on strength criterion is informal.

Claims (3)

1. Niedervolt-Halogen-Projektionsglühlampe mit einem gewendelten Leuchtkörper (3) aus Wolfram, dadurch gekennzeichnet, daß die Wendelsteigung aE der Wendelenden (E1, E2) kleiner als die Wendelsteigung aM des Wendelmittelteils (M) ist.1. Low-voltage halogen projection light bulb with a coiled filament (3) made of tungsten, characterized in that the filament pitch a E of the filament ends (E 1 , E2) is smaller than the filament pitch a M of the filament center part (M). 2. Niedervolt-Halogen-Projektionsglühlampe nach Anspruch 1, dadurch gekennzeichnet, daß die Wendelsteigung aE der Wendelenden (E1, E2) im Bereich 1,2≤aE≤ 1,7 und die Wendelsteigung aM des Wendelmittelteils (M) im Bereich 1,4≤aM≤2,2 liegt, und dabei die Wendelsteigung von den Wendelenden zur Wendelmitte hin schrittweise ansteigt.2. Low-voltage halogen projection lamp according to Claim 1, characterized in that the helix pitch a E of the filament ends (E 1, E 2) in the region 1,2≤a E ≤ 1.7, and the helical pitch a M of the helical central portion (M) in Range 1.4≤a M ≤2.2, and the helix pitch increases gradually from the helix ends to the helix center. 3. Niedervolt-Halogen-Projektionsglühlampe nach Anspruch 1, dadurch gekennzeichnet, daß die Wendelsteigung aE der Wendelenden (E1, E2) im Bereich 1,2≤aE≤1,7 und die Wendelsteigung aM des Wendelmittelteils (M) im Bereich 1,4≤aM≤2,2 liegt, und dabei die Wendelsteigung von den Wendelenden zur Wendelmitte hin kontinuierlich zunimmt.3. Low voltage halogen projection lamp according to Claim 1, characterized in that the helical pitch of the coil ends a E (E 1, E 2) in the range E 1,2≤a ≤1,7 and a helical pitch M of the helical central portion (M) in Range 1.4≤a M ≤2.2, and the helix pitch increases continuously from the helix ends to the helix center.
EP84102813A 1983-04-25 1984-03-15 Low-voltage halogen projection incandescent lamp Expired EP0123844B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8312136U 1983-04-25
DE19838312136U DE8312136U1 (en) 1983-04-25 1983-04-25 LOW VOLTAGE HALOGEN PROJECTION BULB

Publications (3)

Publication Number Publication Date
EP0123844A2 true EP0123844A2 (en) 1984-11-07
EP0123844A3 EP0123844A3 (en) 1985-11-21
EP0123844B1 EP0123844B1 (en) 1989-10-18

Family

ID=6752679

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84102813A Expired EP0123844B1 (en) 1983-04-25 1984-03-15 Low-voltage halogen projection incandescent lamp

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EP (1) EP0123844B1 (en)
DE (2) DE8312136U1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001091161A1 (en) * 2000-05-23 2001-11-29 Illumination Technology, Inc. Low voltage incandescent lamp with variable pitch filament
US6690103B1 (en) 1999-07-21 2004-02-10 Alan K. Uke Incandescent light bulb with variable pitch coiled filament
EP1628326A3 (en) * 2004-08-19 2006-11-29 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Incandescent lamp for vehicle headlight

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR663276A (en) * 1928-08-01 1929-08-19 Osa Spiral filament for electric incandescent lamps and method of manufacturing this filament
FR673811A (en) * 1928-04-21 1930-01-20 Lampes Sa Filament improvements for incandescent lamps
DE1464170A1 (en) * 1962-09-11 1969-04-10 Egyesuelt Izzolampa Compensated incandescent lamp spiral, method and device of its manufacture

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR673811A (en) * 1928-04-21 1930-01-20 Lampes Sa Filament improvements for incandescent lamps
FR663276A (en) * 1928-08-01 1929-08-19 Osa Spiral filament for electric incandescent lamps and method of manufacturing this filament
DE1464170A1 (en) * 1962-09-11 1969-04-10 Egyesuelt Izzolampa Compensated incandescent lamp spiral, method and device of its manufacture

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6690103B1 (en) 1999-07-21 2004-02-10 Alan K. Uke Incandescent light bulb with variable pitch coiled filament
WO2001091161A1 (en) * 2000-05-23 2001-11-29 Illumination Technology, Inc. Low voltage incandescent lamp with variable pitch filament
EP1628326A3 (en) * 2004-08-19 2006-11-29 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Incandescent lamp for vehicle headlight
US7456558B2 (en) 2004-08-19 2008-11-25 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Electric incandescent lamp provided with different pitch factors for each end of a filament component

Also Published As

Publication number Publication date
EP0123844B1 (en) 1989-10-18
DE3480246D1 (en) 1989-11-23
EP0123844A3 (en) 1985-11-21
DE8312136U1 (en) 1984-10-04

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