EP0356840B1 - Lampe à décharge à haute pression - Google Patents

Lampe à décharge à haute pression Download PDF

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Publication number
EP0356840B1
EP0356840B1 EP89115287A EP89115287A EP0356840B1 EP 0356840 B1 EP0356840 B1 EP 0356840B1 EP 89115287 A EP89115287 A EP 89115287A EP 89115287 A EP89115287 A EP 89115287A EP 0356840 B1 EP0356840 B1 EP 0356840B1
Authority
EP
European Patent Office
Prior art keywords
plug
lamp according
pockets
electrode
discharge
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.)
Expired - Lifetime
Application number
EP89115287A
Other languages
German (de)
English (en)
Other versions
EP0356840A2 (fr
EP0356840A3 (fr
Inventor
Johannes Dr. Pfaue
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 EP0356840A2 publication Critical patent/EP0356840A2/fr
Publication of EP0356840A3 publication Critical patent/EP0356840A3/fr
Application granted granted Critical
Publication of EP0356840B1 publication Critical patent/EP0356840B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors

Definitions

  • High-pressure sodium discharge lamps are operated almost without exception as saturated discharge lamps: during operation, only a part of the metal filling, normally mercury and sodium, is evaporated, while the rest is condensed as liquid amalgam at one or more points, the so-called "cold spots".
  • the unsaturated discharge lamp high-pressure mercury lamp
  • the operating voltage determines the lamp power during normal choke operation, and thus brings about a positive feedback to the coldspot temperature.
  • the tube is closed by a sintered or soldered with glass solder cylindrical ceramic stopper with a smooth inner end face.
  • the conductive connection to the electrode is made centrally in the stopper using a niobium tube or niobium wire bushing (DE-A-28 14 411).
  • a niobium tube or niobium wire bushing DE-A-28 14 411.
  • the amount of amalgam intended to buffer the Na loss during the service life is generally larger and makes this construction susceptible to mechanical shocks.
  • the simplest way to influence the coldspot temperature is to change the distance between the core pin tip and the plug.
  • the possibilities of increasing the temperature by shortening this distance are subject to geometric limits if the rear end of the electrode coil abuts the end of the niobium current lead-through element.
  • Higher coldspot temperatures with unchanged ceramic tube construction can then only be achieved by external Heat accumulation measures, in particular heat accumulation sleeves, as are described, for example, in US Pat. No. 3,723,784. Since the assembly of such heat accumulation sleeves is complex, there is considerable interest in a plug construction in which the cold spot temperature is increased compared to the conventional plug construction.
  • the object of the present invention is to provide an improved configuration of the stopper area in high-pressure sodium discharge lamps, in which the amalgam depot is designed as an “internal amalgam”.
  • the vibration-insensitive accommodation of a sufficiently large amount of amalgam should be taken into account in the simplest possible manner and at a location that is protected from the sheet set and at which the interruption of the line of sight between the electrode and the analgam depot becomes fully effective.
  • Another object of the invention is to increase the cold spot temperature compared to the temperature that can be achieved in the discharge vessel designs according to the prior art for "internal amalgam", with additional external heat accumulation measures being avoided with regard to the above-mentioned applications.
  • a pocket plug offers advantages over a ring groove plug according to US-A-3 892 993.
  • the tasks described above can be safely performed.
  • the depth of the pockets should advantageously be chosen to be sufficiently large to accommodate the 20 to 30 mg of amalgam required as a buffer supply.
  • the plug height With a suitable choice of the plug height, it is also possible to set the desired increase in the cold spot temperature. But it turns out that there are limits to this approach. Above a critical filling level of the pockets, a new cold spot is created behind the electrodes and the amalgam begins to condense in the plug bore near the niobium bushing. This would violate an essential requirement, namely the safe electrical isolation between the electrode and the amalgam. In fact, such lamps again show the undesirable ignition behavior with an arc at the amalgam. As a countermeasure, the pocket plugs, which are designed for increased cold spot temperature, are therefore designed with a conically widened bore. The conical widening results in improved heat radiation from the discharge at the lead-through end of the plug bore.
  • the size of this temperature increase determines the overall possible increase in the coldspot temperature. In order to achieve the greatest possible effect, the largest possible opening angle should be selected. This results from the minimum wall thickness between the pocket and the maximum cone opening (d3 - d2): 2 - D.
  • FIG. 2 The construction of the melting of the discharge vessel 4 is shown in detail in FIG. 2.
  • a tubular body 6 made of alumina ceramic is a plug 7 also made of aluminum oxide ceramic sintered gas-tight.
  • the plug 7 has an axially extending bore into which a current supply 8 made of niobium is melted in a gas-tight manner by means of a commercially available glass solder (not shown).
  • the electrode consisting of electrode pin 10 and the electrode coil 11, is fastened in the power supply 8 by means of titanium soldering 9.
  • the other end of the discharge vessel 4, not shown here, is constructed essentially in the same way.
  • the plug 7 consists of a cylindrical part 12 and a conical part 13 of approximately the same length.
  • the length L of the plug 7 is designed such that its conical part 13 facing the discharge space extends beyond the part of the electrode coil 11 facing away from the discharge, whereby the conically widening bore faces the electrode pin 10 and the electrode coil 11.
  • the opening angle ⁇ of the conical part 13 is as large as possible.
  • the stopper 7 is provided according to the invention with three annular segment-shaped pockets 14 which are evenly distributed on its circumference.
  • the pockets 14 are delimited by webs 15, the pockets 14 and the webs 15 each having the same size, ie the segment angle ⁇ of a pocket 14 and a web 15 is 120 ° taken together.
  • the tubular body 6 has a length of approximately 86 mm, an outer diameter of approximately 7.4 mm and an inner diameter of approximately 6 mm.
  • the stopper 7 with its total length L of approximately 9 mm is provided with an axially extending bore with a diameter d 1 of approximately 3.1 mm.
  • the conical part 13 has a largest inner diameter d2 of about 5 mm, which corresponds to an opening angle ⁇ of 24 °.
  • the outer diameter d3 of the plug 7 is equal to the inner diameter of the tubular body 6.
  • the depth T of the pockets is approximately 5.5 mm, the transition from the inner flank of the pocket 14 to the outer diameter d3 of the closure part 7 expediently at an angle ⁇ of 45 ° is executed.
  • the thickness D of the pockets 14 is dependent on the outer diameter d3 of the plug 7 and the largest diameter d2 of the conical part 12. In the present embodiment of a 150 W lamp, the thickness D of the pocket 14 is approximately 0.4 mm.
  • FIGS. 5a to 5d show different parameters of a 150 W sodium high-pressure discharge lamp during its burning time.
  • the electrical power P L (FIG. 5a) of the lamp 1 moves during its 9000 burning hours in a very narrow range of only about 5 W deviation from the nominal power.
  • the operating voltage U L (FIG. 5b) shows only a slight increase of approx. 5 V during this time, starting from approx. 100 V with a lamp burned in for approx. 100 hours.
  • At the luminous flux ⁇ (Fig. 5c) there is virtually no change during the entire burning time of 9000 h measurable; it is constantly around 15,000 lm.
  • the luminous efficacy ⁇ (FIG. 5d) of approx. 100 lm / W can also be classified as extremely low with approx. 4% drop over the entire burning time of the lamp.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)

Claims (8)

  1. Lampe à décharge à haute pression comportant une enceinte de décharge de forme tubulaire (4) en céramique, dont les extrémités respectives sont équipées d'un bouchon (7) en céramique, que traverse, d'une manière étanche aux gaz, un élément d'alimentation en courant (8), qui porte une électrode constituée par une tige (10) et un filament (11), et dans laquelle le bouchon (16), qui entoure sensiblement concentriquement l'électrode, s'étend au moins jusqu'à l'extrémité, tournée à l'opposé de la décharge, du filament d'électrode (11) et comporte, sur la surface métallique tournée à l'opposé de la tige d'électrode (10), et ce sur une partie de sa longueur totale (L), une gorge annulaire (14) ouverte en direction de l'espace de décharge, caractérisée par le fait que la gorge annulaire est interrompue par au moins deux barrettes (15) qui s'appliquent contre la paroi de l'enceinte de décharge, ce qui subdivise cette gorge en un même nombre de poches (14), qui possèdent une forme semblable à un segment de cercle en coupe transversale perpendiculairement à l'axe longitudinal de l'enceinte de décharge (4).
  2. Lampe suivant la revendication 1, caractérisée par le fait que les barrettes (15) sont séparées par une même distance les unes des autres le long de la surface enveloppe du bouchon (7), ce qui a pour effet que les poches (14) possèdent également des longueurs égales.
  3. Lampe suivant les revendications 1 et 2, caractérisée par le fait que la profondeur (T) des poches (14) se situe dans une gamme exprimée par la relation 0,3 L ≦ T ≦ 0 8 L, L étant la longueur totale du bouchon (7).
  4. Lampe suivant les revendications 1 à 3, caractérisée par le fait que l'épaisseur (D) des poches (4) est située dans une gamme qui est exprimée par la relation 0,3 mm ≦ D ≦ (d₃ - d₁) : 4, d₁ désignant le diamètre intérieur et d₃ le diamètre extérieur du bouchon (7).
  5. Lampe suivant les revendications 1 à 4, caractérisée par le fait que l'unité, qui est formée par l'ensemble comprenant une poche (14) et une barrette (15), s'étend sur un angle α compris entre 90° et 120°C, la largeur (B) d'une barrette (15) étant située dans la gamme allant de 0,5 mm à 1,0 mm.
  6. Lampe suivant les revendications 1 à 5, caractérisée par le fait que le bouchon (7) comporte de préférence trois poches (14).
  7. Lampe suivant les revendications 1 à 6, caractérisée par le fait que le bouchon (7) est subdivisé, le long de son axe longitudinal, en une partie cylindrique (12) et une partie conique (13), la partie cylindrique (12) étant prévue pour la liaison, étanche aux gaz, avec l'élément d'alimentation en courant (8).
  8. Lampe suivant les revendications 1 à 7, caractérisée par le fait que la zone, dont le diamètre augmente, de la partie conique (13) est tournée vers le filament (11) de l'électrode.
EP89115287A 1988-09-01 1989-08-18 Lampe à décharge à haute pression Expired - Lifetime EP0356840B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3829729A DE3829729A1 (de) 1988-09-01 1988-09-01 Hochdruckentladungslampe
DE3829729 1988-09-01

Publications (3)

Publication Number Publication Date
EP0356840A2 EP0356840A2 (fr) 1990-03-07
EP0356840A3 EP0356840A3 (fr) 1991-05-02
EP0356840B1 true EP0356840B1 (fr) 1994-03-09

Family

ID=6362094

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89115287A Expired - Lifetime EP0356840B1 (fr) 1988-09-01 1989-08-18 Lampe à décharge à haute pression

Country Status (5)

Country Link
US (1) US5015913A (fr)
EP (1) EP0356840B1 (fr)
JP (1) JPH02106866A (fr)
KR (1) KR900005548A (fr)
DE (2) DE3829729A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0561450B1 (fr) * 1992-03-16 1996-06-12 Koninklijke Philips Electronics N.V. Lampe à sodium à haute pression
US5434472A (en) * 1992-04-15 1995-07-18 United States Philips Corporation High-pressure sodium discharge lamp with getter
US5290638A (en) * 1992-07-24 1994-03-01 Massachusetts Institute Of Technology Superconducting joint with niobium-tin
US5723939A (en) * 1994-12-28 1998-03-03 Matsushita Electronics Corporation Circular fluorescent lamp
US6583563B1 (en) * 1998-04-28 2003-06-24 General Electric Company Ceramic discharge chamber for a discharge lamp
US7297037B2 (en) * 1998-04-28 2007-11-20 General Electric Company Ceramic discharge chamber for a discharge lamp
EP1182681B1 (fr) * 2000-08-23 2006-03-01 General Electric Company Tube à arc pour lampe à halogénure métallique fait de céramique moulée par injection et présentant une extrémité non oblique
DE20307607U1 (de) * 2003-05-15 2004-09-23 Zumtobel Staff Gmbh Beleuchtungsanordnung bestehend aus einer Gasentladungslampe und einer Abschirmhülse
US7282864B2 (en) * 2004-09-09 2007-10-16 Seiko Epson Corporation Discharge lamp and control of the same
US8319431B2 (en) * 2010-06-25 2012-11-27 General Electric Company Ceramic arc tube for a discharge lamp and method of making same

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3450924A (en) * 1967-05-23 1969-06-17 Westinghouse Electric Corp Sealing means for refractory ceramic discharge device envelopes
US3723784A (en) * 1971-04-15 1973-03-27 Gen Electric Alumina ceramic lamp having heat-reflecting shields surrounding its electrodes
DE2209848A1 (de) * 1972-03-01 1973-09-06 Patra Patent Treuhand Vakuumdichter verschluss bei metalldampfhochdruckentladungslampen
NL172194C (nl) * 1973-02-16 1983-07-18 Philips Nv Hogedrukontladingslamp.
NL181764C (nl) * 1977-04-15 1987-10-16 Philips Nv Hogedrukmetaaldampontladingslamp.
GB2105904B (en) * 1981-09-04 1985-10-23 Emi Plc Thorn High pressure discharge lamps

Also Published As

Publication number Publication date
DE58907168D1 (de) 1994-04-14
EP0356840A2 (fr) 1990-03-07
KR900005548A (ko) 1990-04-14
EP0356840A3 (fr) 1991-05-02
DE3829729A1 (de) 1990-03-15
US5015913A (en) 1991-05-14
JPH02106866A (ja) 1990-04-18

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