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WO2006035339A1 - Lampe a decharge de gaz basse pression - Google Patents

Lampe a decharge de gaz basse pression Download PDF

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Publication number
WO2006035339A1
WO2006035339A1 PCT/IB2005/053056 IB2005053056W WO2006035339A1 WO 2006035339 A1 WO2006035339 A1 WO 2006035339A1 IB 2005053056 W IB2005053056 W IB 2005053056W WO 2006035339 A1 WO2006035339 A1 WO 2006035339A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas discharge
low
radiation
pressure gas
lamp
Prior art date
Application number
PCT/IB2005/053056
Other languages
English (en)
Inventor
Rainer Hilbig
Stefan Schwan
Original Assignee
Philips Intellectual Property & Standards Gmbh
Koninklijke Philips Electronics N. V.
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 Philips Intellectual Property & Standards Gmbh, Koninklijke Philips Electronics N. V. filed Critical Philips Intellectual Property & Standards Gmbh
Publication of WO2006035339A1 publication Critical patent/WO2006035339A1/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
    • H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
    • 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
    • H01J61/35—Vessels; Containers provided with coatings on the walls thereof; Selection of materials for the coatings

Definitions

  • the invention relates to a low-pressure gas discharge lamp that comprises at least a gas-discharge vessel containing a gas filling, and components for producing and maintaining a low-pressure gas discharge.
  • charge carriers which are particularly electrons but may also be ions
  • charge carriers are accelerated in the gas discharge vessel, by an electrical field between the electrodes of the lamp, in such a way that they collide with the gas atoms or molecules in the gas filling. These collisions excite the gas filling and ionize it. When the atoms or molecules return to their ground state, atomic or molecular radiation is emitted.
  • the generation of light in conventional low-pressure gas discharge lamps, i.e. particularly in lamps that contain mercury in the gas filling is accomplished essentially by means of atomic radiation.
  • radiation density is a measure of the value of the intensity of the radiation in a wavelength range, which range may be situated both in the region of the wavelength spectrum that is visible to the human eye and in the one that is not.
  • Low-pressure gas discharge lamps have also been described in which it is particularly molecular radiation that is emitted, such for example as in EP 1 187 173 A2 or EP l 187 174 A2.
  • the low-pressure gas discharge lamp that is described in EP 1 187 173 A2 is fitted with a gas discharge vessel that contains a copper-containing gas filling and a buffer gas, and with components for producing and maintaining a low-pressure gas discharge.
  • a low-pressure gas discharge lamp that is fitted with a gas discharge vessel that contains an indium-containing gas filling and a buffer gas.
  • higher radiation densities are required for the molecular radiation that is emitted.
  • the object of the invention is achieved by a low-pressure gas discharge lamp having the features claimed in claim 1.
  • the low-pressure gas discharge lamp according to the invention comprises at least a gas discharge vessel that contains a gas filling having a copper, indium, thallium or gallium compound selected from the group consisting of the halides, oxides, chalcogenides, hydroxides, hydrides, or the organometallic compounds, or the tin halides, or the chalcogenides of the main group 4 of the periodic table, or mixtures thereof, and that contains a buffer gas, and components for producing and maintaining a low-pressure gas discharge, the gas discharge vessel having at least one region that serves primarily as an exit opening for the molecular radiation of a predetermined wavelength range and a predetermined radiation density that is emitted, which radiation density, when the lamp is operating, is increased in comparison with the radiation density at the other regions of the discharge vessel at which radiation can, in principle, emerge.
  • a gas discharge vessel that contains a gas filling having a copper, indium, thallium or gallium compound selected from the group consisting of the halides, oxide
  • lamps according to the invention can thus be excited and operated by means of internal or external lamp electrodes or entirely without electrodes.
  • the lamp When the lamp is operated by external electrodes (electrical field is coupled in), it is generally operated by means of capacitive coupling; the possibilities when there are no electrodes are, in particular, inductive operation (coupling of the magnetic field) or microwave operation (coupling of the electromagnetic field).
  • Components for producing and maintaining within the meaning of the invention are components that are known for applications and modes of operation of this kind, such as internal and external electrodes. These components may in turn comprise a plurality of components or parts.
  • the lamp according to the invention may be used in particular for tanning purposes and for treating acne, using in particular the directly emitted UV radiation for this, and for general lighting applications, particularly if the radiation from the molecules is in the visible range of the spectrum.
  • Other preferred fields of application are as an aperture lamp (with or without phosphors), particularly for general lighting applications, and as a lamp in devices for office automation (OA), e.g. copying machines and color scanners, or for the background lighting of displays, e.g. liquid crystal displays.
  • the shape of the aperture which is preferably in the form of a rectangular slot. Shapes such as, for example, wavy lines or letters come within the scope of the invention.
  • this low-pressure gas discharge lamp had, in particular, a gas discharge vessel of quartz glass that was of cylindrical geometry and had a diameter of approximately 25 mm and a length of approximately 250 mm.
  • the gas discharge vessel also contained a gas filling having indium halides (InBr).
  • InBr indium halides
  • the measurements on the first measuring set-up were made radially relative to the longitudinal axis of the gas discharge vessel, i.e. the measurements of the radiation emitted took place at right angles to the surface of the cylindrical gas discharge vessel, or in other words were what is termed side-on.
  • this measured spectrum from the first measuring set-up i.e. the dependence of the radiation density on the particular wavelength, is represented by the broken line.
  • the spectrum that can be seen in Fig. 1 is characterized in particular by the excursions of the band emission of the InBr molecule between approximately 355 nm and approximately 390 nm and of the band emissions of atomic indium at approximately 451 nm, 410 nm, 326 nm and 304 nm.
  • the measurements on the second measuring set-up took place under similar conditions but axially in relation to the longitudinal axis of the gas discharge vessel, i.e. the measurement of the radiation emitted was made along the longitudinal axis of the cylindrical gas discharge vessel.
  • this unexpected, measured effect can be used to deliberately increase the radiation density with preset operating and geometrical parameters - without any increase in the power to the lamp. This is done by exploiting the molecular radiation in selected wavelength ranges for this purpose, which radiation can, if required, be increased still further by making suitable provisions (e.g. back reflection in the gas discharge. This is successfully achieved particularly in a case where the molecular radiation from the gas discharge space is emitted by only a small part of the surface of the lamp.
  • the increase that is possible in the radiation density as compared with the radiation density when no additional measures are taken is dependent, as well as on geometrical factors, in particularly on the form of radiating molecule used.
  • the radiation density S that can be achieved is generally proportional to the particle density of the radiating species and on the effective path length L eff over which this radiation is built up through the discharge volume along the beam to the eye. As long as the self-absorption of the emitted radiation from the radiating species (from the molecules N m0 ⁇ in this case) is small, the radiation density S is linearly dependent on the particle density N mo i and the effective path length L e fr:
  • This maximum molecule density N_max mo i at which in increase in radiation density is, in principle, still possible can be defined as a function of molecular parameters such as, amongst others, the transition probability A ba n d of the molecule band being considered and the latter's width of emission ⁇ band, and as a function of geometrical factors such as, in particular, the "simple absorption length x abS " (e.g. the radius of a cylindrical discharge vessel) and the mean number of back reflections n r , by for example:
  • O.I The effective spectral filling factor
  • the above formula can be derived from studies of radiation absorbance (Beer's law) and from certain specific properties of molecule absorbance. In the formula, the reflectance of the reflecting layers is assumed to be of an idealized form, i.e. to be 100%. This formula for the maximum molecule densities is used for the purposes of the invention to give a limiting density value for the effect described (increase in the density of non-coherent radiation). The range within which the increase in radiation density is linear with the number of reflections is the density range in which the effect gives the greatest benefit and is thus preferred.
  • the following equation is thus suitable for densities N mo i less than N_lin mo i:
  • S Radiation density from the lamp when steps are taken to increase the radiation density (e.g. an aperture)
  • S 0 Radiation density from the lamp when no steps are taken to increase the radiation density
  • n r Mean number of back reflections
  • the lamp according to the invention may, in principle be equipped, and then operated as well, with internal and/or external electrodes.
  • a further alternative is for the discharge vessel to be produced from optically transparent material only at the end-faces.
  • the diffusely reflecting layer may also, if desired, be applied to the outside of the gas discharge vessel.
  • a further alternative is, when the diffusely reflecting layer is applied on the inside, for the gas discharge vessel to be produced from optically transparent material only at the points where the aperture is situated.
  • the object of the invention is also achieved by a lighting unit having at least one low-pressure gas discharge lamp as claimed in claims 1 to 10.
  • the lighting unit according to the invention having at least one low-pressure gas discharge lamp may be used in particular for tanning purposes and for treating acne, using in particular the directly emitted UV radiation for this, and for general lighting applications, particularly if the radiation from the molecules is in the visible range of the spectrum.
  • Other preferred fields of application are as an aperture lamp unit with or without phosphors, particularly for general lighting applications, and as a lamp in devices for office automation (OA), e.g. copying machines and color scanners, or for the background lighting of displays, e.g. liquid crystal displays.
  • OA office automation
  • Fig. 2 is a schematic side view of a low-pressure gas discharge lamp and a measuring set-up (for head-on measurement).
  • Fig. 3 is a schematic view in section through a cylindrical gas discharge lamp.
  • the present low-pressure gas discharge lamp 1 provided with a measuring set-up (for head-on measurement) is, as can be seen in Fig. 2, arranged in an electrical heating oven 8.
  • the measuring device 7 is arranged approximately on the longitudinal axis of the lamp 1 and is spaced away from an end-face of the lamp 1.
  • the low-pressure gas discharge lamp 1 has a gas discharge vessel 2 of quartz glass that is of cylindrical, tubular geometry and has a diameter of approximately 25 cm and a length of approximately 250 mm (length of lamp: L; inside diameter of lamp: d; L » d).
  • the inside diameter of the gas discharge vessel is approximately 24 cm.
  • the hermetically sealed gas discharge vessel 2 contains, as well as a normal buffer gas such as argon, a gas filling containing indium halides (InBr).
  • the low-pressure gas discharge lamp 1 is operated in a normal manner by means of capacitive coupling.
  • a normal diffusely reflecting coating 5 which in particular does not allow any molecular radiation to pass through.
  • the two end- faces act as exit openings 4 for the molecular radiation that is emitted, particularly in the predetermined wavelength range from 355 nm to 390 nm.
  • To the outer surface of the ends may be applied a normal layer of phosphor 6 that in particular causes UV radiation to be converted into visible radiation, and in this specific case into white light.
  • the lamp according to the invention may, in principle, be equipped, and then operated as well, with internal and/or external electrodes.
  • a further alternative is for the discharge vessel to be produced from optically transparent material only at the end-faces.
  • FIG. 3 A further preferred embodiment is shown schematically in Fig. 3. What is shown is a section through a cylindrical gas discharge lamp, namely a section at the center of the tubular lamp 1. Not shown are the provisions that are made, which are shown in Fig. 1 , to bring the gas discharge vessel 2 to a temperature at its coldest point of, for example, 218 0 C. This can for example be done by a heating oven, as in the case of the first embodiment, or by an outer enclosing tube provided with conventional heat-reflecting layers.
  • the low-pressure gas discharge lamp 1 shown has a gas discharge vessel 2 of quartz glass that is of cylindrical, tubular geometry and has a diameter of approximately 25 cm and a length of approximately 250 mm.
  • the hermetically sealed gas discharge vessel 2 contains, as well as a normal buffer gas such as argon, a gas filling containing indium halides (InBr).
  • the low-pressure gas discharge lamp 1 is operated in a normal manner by means of capacitive coupling. Except in the region that is marked as the aperture 9, there is applied to the inside surface a diffusely reflecting coating 5 that in particular does not allow molecular radiation to pass through.
  • the aperture 9 acts as an exit opening 4 for the molecular radiation, particularly in the predetermined wavelength range from 355 nm to 390 nm, that is emitted.
  • the diffusely reflecting layer 5 may also, if desired, be applied to the outside of the gas discharge vessel 2.
  • a further alternative is, when the diffusely reflecting layer 5 is applied on the inside, for the gas discharge vessel 2 to be produced from optically transparent material only at the points where the aperture 9 is situated.
  • a normal phosphor layer may, in addition, be applied to the aperture 9, which layer in particular causes the UV radiation from 355 nm to 390 nm to be converted into visible radiation, and in this specific case into white light.
  • the lamp according to the invention may, in principle be equipped, and then operated as well, with internal and/or external electrodes.

Landscapes

  • Discharge Lamp (AREA)

Abstract

L'invention concerne une lampe à décharge de gaz basse pression qui comprend au moins un réservoir de décharge de gaz (2) qui contient un gaz de remplissage possédant un composé cuivre, indium, thallium ou gallium sélectionné dans le groupe comprenant halogénures, oxydes, chalcogénures, hydroxydes, hydrures, ou les composés organométalliques, ou les halogénures d'étain, ou les chalcogénures du groupe principal 4 de la classification périodique, ou des mélanges de ceux-ci, et qui contient un gaz tampon, et des composants permettant de produire et de maintenir une décharge de gaz basse pression (3), le réservoir de décharge de gaz (2) possédant au moins une région faisant office principalement d'ouverture de sortie (4) pour le rayonnement moléculaire d'une plage de longueur d'onde prédéterminée et d'une densité de rayonnement prédéterminée qui est émise ; ladite densité de rayonnement, lorsque la lampe (1) fonctionne, étant augmentée par comparaison avec la densité de rayonnement au niveau d'autres régions du réservoir de décharge de gaz (2) au niveau duquel le rayonnement peut, en principe, émerger.
PCT/IB2005/053056 2004-09-28 2005-09-19 Lampe a decharge de gaz basse pression WO2006035339A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04104722.6 2004-09-28
EP04104722 2004-09-28

Publications (1)

Publication Number Publication Date
WO2006035339A1 true WO2006035339A1 (fr) 2006-04-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2005/053056 WO2006035339A1 (fr) 2004-09-28 2005-09-19 Lampe a decharge de gaz basse pression

Country Status (1)

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WO (1) WO2006035339A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR1006103B (el) * 2007-08-21 2008-10-15 Σπυριδων Κιτσινελης Λαμπτηρας βασισμενος σε σωληνα εκκενωσης χαμηλης πιεσης ατμων αλογονιδιων του αλουμινιου και γαλλιου

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4140385A (en) * 1976-03-22 1979-02-20 Xerox Corporation Low pressure metal or metal halide lamps for photocopying applications
US5903091A (en) * 1996-05-31 1999-05-11 Fusion Lighting, Inc. Lamp method and apparatus using multiple reflections
EP1178518A1 (fr) * 2000-07-31 2002-02-06 Secretary of Agency of Industrial Science and Technology Dispositif émetteur de lumière
US20020180359A1 (en) * 2000-12-19 2002-12-05 Kirkpatrick Douglas A. Discharge lamp with indium and erbium fill
US20030001505A1 (en) * 2001-06-15 2003-01-02 Scholl Robert Peter Low-pressure gas discharge lamp with a mercury-free gas filling

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4140385A (en) * 1976-03-22 1979-02-20 Xerox Corporation Low pressure metal or metal halide lamps for photocopying applications
US5903091A (en) * 1996-05-31 1999-05-11 Fusion Lighting, Inc. Lamp method and apparatus using multiple reflections
EP1178518A1 (fr) * 2000-07-31 2002-02-06 Secretary of Agency of Industrial Science and Technology Dispositif émetteur de lumière
US20020180359A1 (en) * 2000-12-19 2002-12-05 Kirkpatrick Douglas A. Discharge lamp with indium and erbium fill
US20030001505A1 (en) * 2001-06-15 2003-01-02 Scholl Robert Peter Low-pressure gas discharge lamp with a mercury-free gas filling

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR1006103B (el) * 2007-08-21 2008-10-15 Σπυριδων Κιτσινελης Λαμπτηρας βασισμενος σε σωληνα εκκενωσης χαμηλης πιεσης ατμων αλογονιδιων του αλουμινιου και γαλλιου

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