WO2008052894A2 - Lampe à décharge à basse pression - Google Patents

Lampe à décharge à basse pression Download PDF

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Publication number
WO2008052894A2
WO2008052894A2 PCT/EP2007/061234 EP2007061234W WO2008052894A2 WO 2008052894 A2 WO2008052894 A2 WO 2008052894A2 EP 2007061234 W EP2007061234 W EP 2007061234W WO 2008052894 A2 WO2008052894 A2 WO 2008052894A2
Authority
WO
WIPO (PCT)
Prior art keywords
low
electrode
pressure discharge
discharge lamp
coil
Prior art date
Application number
PCT/EP2007/061234
Other languages
German (de)
English (en)
Other versions
WO2008052894A3 (fr
Inventor
Siegfried Hien
Gerald Hämmer
Thomas Noll
Viktor Malik
Original Assignee
Osram Gesellschaft mit beschränkter Haftung
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 Osram Gesellschaft mit beschränkter Haftung filed Critical Osram Gesellschaft mit beschränkter Haftung
Publication of WO2008052894A2 publication Critical patent/WO2008052894A2/fr
Publication of WO2008052894A3 publication Critical patent/WO2008052894A3/fr

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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
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/067—Main electrodes for low-pressure discharge lamps
    • H01J61/0672—Main electrodes for low-pressure discharge lamps characterised by the construction of the electrode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/24—Means for obtaining or maintaining the desired pressure within the vessel
    • H01J61/28—Means for producing, introducing, or replenishing gas or vapour during operation of the lamp
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Definitions

  • the invention relates to a low-pressure discharge lamp having at least one discharge vessel, in the discharge space of which two electrode filaments are accommodated, which are connected to power supply lines and each have at least two filament legs provided with an emitter material.
  • a low-pressure discharge lamp with a discharge vessel in the interior of which two electrode systems are accommodated which essentially consist of an electrode filament coated with emitter material whose ends are each connected to a power supply, which in an end portion of the lamp are sealed gas-tight.
  • a glass bead is provided, in which the two power supply lines of the electrode coil are melted.
  • the glass bead has an approximately circular cylindrical or mushroom-shaped main body with rounded ends, wherein the axis of the main body extends transversely to the longitudinal axis of the discharge vessel in this area.
  • a paste of a metal hydride, in particular titanium hydride is applied with a rheological additive.
  • a metal hydride in particular titanium hydride
  • the lamp goes into a cold cathode operation, which has an increase in the cathode drop voltage and thus a strong heating of the electrode system result.
  • the large increase in temperature leads to a disintegration of the metal hydride on the glass bead, so that hydrogen is released, which terminates the discharge in the discharge vessel due to the increasing burning voltage of the lamp.
  • the life of such, for example, as a fluorescent lamp or compact fluorescent lamp, trained low-pressure discharge lamps is essentially limited by the amount of emitter on the electrode coil and the consumption of emitter material during the start and operation of the lamp.
  • a disadvantage of such lamps is, on the one hand, that the emitter quantity for extending the life of the lamp can not be increased as desired since it must be embedded in the tungsten wire of the electrode coil and, on the other hand, during the cold start of the lamp, an arc discharge occurs, which merely produces one Part of the electrode coil meets, since the sheet attaches in each case at the transition from not pieced with emitter material part of the electrode to the pasted part of the electrode. This leads to a sputtering process which damages the emitter-free filament ends and can lead to premature breakage of the electrode filament.
  • a low-pressure discharge lamp is known, for example, from WO 01/33606 A1, in which the electrode system has two electrode filaments arranged in parallel or one as an additional one Having inner current supply coil holder in two or more filament leg divided electrode coil having at least partially provided with an emitter material.
  • This solution has the advantage that the lamp can continue to be operated in the event of a failure of an electrode filament or a filament leg and the damage to the emitter-free filament ends during cold start by sputtering is reduced, since the damage is distributed, for example, to four instead of two filament ends .
  • the disadvantage of such low-pressure discharge lamps is that they are expensive to manufacture due to the additional electrode lead or inner power supply.
  • the forming process can not be carried out homogeneously due to the different behavior of the two individual filaments.
  • the invention has for its object to provide a low-pressure discharge lamp, in which over conventional solutions a service life extension is made possible with minimal device complexity.
  • a low-pressure discharge lamp having at least one discharge vessel, in the discharge space of which are accommodated two electrode filaments which are connected to power supply lines and each have at least two filament legs provided with an emitter material.
  • an electrically insulated coil holder is provided which engages between the helical legs and the electrode coils in such Positioned fixed to the discharge vessel that the helical limbs have an angle of less than 180 ° to each other.
  • the electrode coils are formed with respect to the prior art with at least two spiral legs as two-dimensional electrode coil which extends into the discharge space, so that a larger coil length and thus a larger emitter amount is achieved without the emitter / tungsten network of the electrode coil must be changed. That is, the electrode filaments can accommodate more Emittermenge with the same winding geometry. As the life scales with the increase in the emitter weight, a substantial improvement in the life of the low-pressure discharge lamp can be achieved. The damage to the emitter-free coil ends by sputtering during cold start is reduced, thereby further increasing the service life, since the damage is distributed over several coil ends.
  • This solution has over the prior art according to WO 01/33606 Al further has the advantage that no additional power supply is required and the forming is improved.
  • the spiral legs extend at an angle of about 60 ° to 140 °, preferably of 80 ° to each other in the direction of the discharge space.
  • the electrode filaments each have two filament legs. sen and a connecting portion of the coil legs is held approximately centrally in the coil holder.
  • the helical holder extends in particular approximately parallel to the longitudinal axis of the discharge vessel in this area.
  • the helical holder extends at a distance to the electrode coil and engages on a holding portion of this, which extends approximately perpendicular to a plane of the electrode coil.
  • the electrode holder can be advantageously connected to the electrode coil by means of clamping and / or welding.
  • the power supply lines and the coil holder are embedded in a glass bead.
  • the current leads of the electrode filaments are electrically connected to one another, so that the electrode filaments continue to burn even after a spiral break and the emitter of the filaments is completely used up. Due to the held over the coil holder further Wendelschenkels the lamp can be operated even if a filament leg is completely destroyed. This makes it possible to extend the service life of the low-pressure discharge lamp by the burning time of the residual emitter quantity. It has proved to be advantageous if one of the electrode filaments is designed as a spiral with a longer service life. As a result, a common area of two failure distributions is prevented, so that greater reliability is achieved.
  • a cut-off device at the end of the service life.
  • a paste of a metal hydride, in particular of titanium hydride with a rheological additive is applied to the glass bead.
  • the lamp changes to a cold cathode mode, which results in an increase in the cathode drop voltage and thus in a strong heating of the electrode system. This increase in temperature leads to a disintegration of the titanium hydride, so that hydrogen is released, which terminates the discharge in the discharge vessel due to the increasing burning voltage of the lamp.
  • FIG. 1 is a schematic representation of a low-pressure discharge lamp and FIG. 2 shows a side view of the low-pressure discharge lamp from FIG. 1.
  • FIG. 1 shows a schematic representation of a low pressure discharge lamp 1 according to the invention designed as a fluorescent lamp.
  • This has an approximately rod-shaped or discharge tube 2 made of glass, which is provided with a phosphor layer (not shown), with the low-pressure discharge lamp 1 only being used for reasons of clarity an end section is shown.
  • the discharge vessel 2 has a discharge chamber 6 which is sealed on both sides by fuses 4, into which two electrode systems 8 essentially consist of an electrode coil 10, each having two filament legs 12, 14 provided with an emitter material, wherein an electrically insulated coil holder 16 is centered between the helical limbs 12, 14 engages and the electrode coils 10 so fixed in position in the discharge vessel 2, that the coil legs 12, 14 have an angle ⁇ of less than 180 ° to each other, so that a larger coil length and thus a larger E-mittermenge is achieved without that the emitter / tungsten network of the electrode coil 10 must be adapted.
  • Damage to the e- without coil ends 20, 22, 24, 26 at cold start by sputtering is reduced, thereby increasing the life, since the damage on four coil ends 20, 22, 24, 26 distributed.
  • the end portions 20, 26 of the E lektrodenwendeln 10 are connected for electrical contacting with power supply lines 28, 30, which enforce the seals 4.
  • an ionizable filling is included, which consists essentially of one or more noble gases and a small amount of mercury. Between the two lamp ends, a gas discharge is formed during lamp operation.
  • the power supply lines 28, 30 and the coil holder 16 are embedded in a glass bead 36 arranged approximately centrally between the electrode coil 10 and the adjacent melt 4, the two power supply lines 28, 30 near the two ends of the glass bead 36 and the coil holder 16 via an end section 38 approximately in the middle - in the soft state - in the glass bead 36 is inserted.
  • the power supply lines 28, 30 of the Elekt- rodenwendeln 10 are electrically connected to each other in the illustrated embodiment, ie short-circuited, so that the lamp 1 continues to burn at a helical break and the emitter of the electrode coils 10 is substantially completely consumed. As a result, a further service life extension of the low-pressure discharge lamp 1 by the residual emitter quantity is possible.
  • the glass bead 36 has an approximately circular cylindrical base body with rounded ends, wherein the axis of the base body extends transversely to the longitudinal axis of the discharge vessel 2 in this area.
  • a pasty coating 42 of titanium hydride and a rheological additive is applied on a side surface 40 of the glass bead 36.
  • the lamp 1 goes into a cold cathode mode, which results in an increase in the cathode drop voltage and thus in a strong heating of the electrode system 8.
  • This increase in temperature leads to a decomposition of the titanium hydride, so that hydrogen is released, which terminates the discharge in the discharge vessel 2 due to the increasing operating voltage of the lamp 1.
  • FIG. 2 which shows a side view of the electrode system 8 from FIG. 1, the helical holder 16 is inserted in a soft state via the end section 38 on a rear side 44 of the glass bead 36 remote from the titanium hydride coating 42 and extends in sections parallel to it 1) in this area and spaced from the electrode coil 10.
  • the coil holder 16 engages over a approximately perpendicular to a plane of the electrode coil 10 extending holding portion 46 at the connecting portion 18 of the coil legs 12, 14 at.
  • the electrode coil 10 can advantageously be connected by clamping or welding to the coil holder 16 and the power supply lines 28, 30 in terms of manufacturing technology.
  • the low-pressure discharge lamp 1 according to the invention is not limited to the described embodiment of a rod-shaped fluorescent lamp, but rather can the discharge lamp 1 have different known from the prior art discharge vessel shapes.
  • the low-pressure discharge lamp 1 can be designed as a compact fluorescent lamp.
  • the electrode filaments may each have more than two filament legs.
  • a low-pressure discharge lamp 1 in particular a fluorescent or compact fluorescent lamp, with at least one discharge vessel 2, in the discharge space 6, two electrode coils 10 are accommodated, which are connected to power supply lines 28, 30 and each having at least two provided with an emitter material coil legs 12, 14 ,
  • at least one electrically insulated coil holder 16 is provided which engages between the coil legs 12, 14 and fixes the electrode coils 10 in the discharge vessel 2 such that the coil legs 12, 14 have an angle ⁇ of less than 180 ° to one another.

Landscapes

  • Discharge Lamp (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

L'invention concerne une lampe à décharge à basse pression, en particulier une lampe à substance luminescente ou une lampe compacte à substance luminescente, qui présente au moins un récipient de décharge (2) dont l'espace de décharge (6) reçoit deux enroulements d'électrode (10) reliés à des amenées de courant (28, 30) et au moins deux branches d'enroulement respectives (12, 14) dotées d'un matériau émetteur. Selon l'invention, au moins un support (16) d'enroulement électriquement isolé est prévu, celui-ci s'engage entre les branches d'enroulement (12, 14) et immobilise les enroulements d'électrode (10) dans le récipient de décharge (2) de telle sorte que les branches d'enroulement (12, 14) forment l'une avec l'autre un angle inférieur à 180°.
PCT/EP2007/061234 2006-11-03 2007-10-19 Lampe à décharge à basse pression WO2008052894A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006052028A DE102006052028A1 (de) 2006-11-03 2006-11-03 Niederdruckentladungslampe
DE102006052028.9 2006-11-03

Publications (2)

Publication Number Publication Date
WO2008052894A2 true WO2008052894A2 (fr) 2008-05-08
WO2008052894A3 WO2008052894A3 (fr) 2008-12-11

Family

ID=38820317

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/061234 WO2008052894A2 (fr) 2006-11-03 2007-10-19 Lampe à décharge à basse pression

Country Status (2)

Country Link
DE (1) DE102006052028A1 (fr)
WO (1) WO2008052894A2 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB943740A (en) * 1959-07-09 1963-12-04 Claudgen Ltd Improvements in or relating to low pressure electric discharge lamps
US3448318A (en) * 1966-11-17 1969-06-03 Gen Electric Low pressure electric discharge lamp electrode
US3898503A (en) * 1969-01-15 1975-08-05 Duro Test Corp Dual cathode structure
DE10125510A1 (de) * 2001-05-23 2002-12-05 Innolux Gmbh Leuchtstofflampenschaltung
US20030062847A1 (en) * 2001-09-29 2003-04-03 Ye Guan Rong Fluorescent luminaire capable of starting with broken filament
DE10218827A1 (de) * 2002-04-26 2003-11-06 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Niederdruckentladungslampe mit Abschaltvorrichtung am Lebensdauerende
WO2005010922A2 (fr) * 2003-07-29 2005-02-03 Koninklijke Philips Electronics N.V. Lampe a decharge de mercure et a basse pression presentant une probabilite de defaillance determinee
WO2008052893A1 (fr) * 2006-11-03 2008-05-08 Osram Gesellschaft mit beschränkter Haftung Circuit pour lampes à décharge à basse pression

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB943740A (en) * 1959-07-09 1963-12-04 Claudgen Ltd Improvements in or relating to low pressure electric discharge lamps
US3448318A (en) * 1966-11-17 1969-06-03 Gen Electric Low pressure electric discharge lamp electrode
US3898503A (en) * 1969-01-15 1975-08-05 Duro Test Corp Dual cathode structure
DE10125510A1 (de) * 2001-05-23 2002-12-05 Innolux Gmbh Leuchtstofflampenschaltung
US20030062847A1 (en) * 2001-09-29 2003-04-03 Ye Guan Rong Fluorescent luminaire capable of starting with broken filament
DE10218827A1 (de) * 2002-04-26 2003-11-06 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Niederdruckentladungslampe mit Abschaltvorrichtung am Lebensdauerende
WO2005010922A2 (fr) * 2003-07-29 2005-02-03 Koninklijke Philips Electronics N.V. Lampe a decharge de mercure et a basse pression presentant une probabilite de defaillance determinee
WO2008052893A1 (fr) * 2006-11-03 2008-05-08 Osram Gesellschaft mit beschränkter Haftung Circuit pour lampes à décharge à basse pression

Also Published As

Publication number Publication date
WO2008052894A3 (fr) 2008-12-11
DE102006052028A1 (de) 2008-05-08

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