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WO1995027999A1 - Couche de phosphore pour lampe a decharge sans electrode - Google Patents

Couche de phosphore pour lampe a decharge sans electrode Download PDF

Info

Publication number
WO1995027999A1
WO1995027999A1 PCT/GB1995/000799 GB9500799W WO9527999A1 WO 1995027999 A1 WO1995027999 A1 WO 1995027999A1 GB 9500799 W GB9500799 W GB 9500799W WO 9527999 A1 WO9527999 A1 WO 9527999A1
Authority
WO
WIPO (PCT)
Prior art keywords
lamp
lamp envelope
envelope
phosphor coating
inner cavity
Prior art date
Application number
PCT/GB1995/000799
Other languages
English (en)
Inventor
Andrew Terence Rowley
Original Assignee
Ge Lighting Limited
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 Ge Lighting Limited filed Critical Ge Lighting Limited
Priority to DE69512166T priority Critical patent/DE69512166T2/de
Priority to JP7526169A priority patent/JPH08511652A/ja
Priority to EP95914458A priority patent/EP0702846B1/fr
Publication of WO1995027999A1 publication Critical patent/WO1995027999A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/56—One or more circuit elements structurally associated with the lamp
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/38—Devices for influencing the colour or wavelength of the light
    • H01J61/42—Devices for influencing the colour or wavelength of the light by transforming the wavelength of the light by luminescence
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
    • H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
    • H01J65/042—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field
    • H01J65/048—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field the field being produced by using an excitation coil

Definitions

  • This invention relates to an arrangement for providing phosphor coating to a lamp envelope portion of an electrodeless discharge lamp and more particularly, to such a phosphor coating arrangement as provides a more practical solution to the differences in wall loading characteristics that are present in an electrodeless discharge lamp.
  • the electrodeless discharge lamp is projected as being a large contributor in efforts to reduce electricity demand thereby allowing electric utilities to forego the construction of costly power generating facilities.
  • the contribution of the electrodeless discharge lamp is expected to result from the increased energy efficiency of such device as well as the expected long life resulting from the elimination of life inhibiting electrode elements.
  • An example of an electrodeless discharge lamp can be found in US Patent No. 4,010,400 in which it is disclosed that an ionizable medium can be disposed in a lamp envelope and excited to a discharge state by introduction of an RF signal in close proximity thereto such that by use of a suitable phosphor, visible light can be produced by such discharge.
  • the electrodeless discharge lamp includes a ballast circuit arrangement disposed in the lamp base, such ballast circuit arrangement including a resonant tank circuit which utilizes a coil member extending into the lamp envelope to inductively couple the RF signal to the ionizable medium.
  • the electrodeless discharge lamp requires a phosphor layer to convert the discharge from the ionized medium into visible light. It is the typical practice in fluorescent lamp manufacture to use halophosphates and to obtain the required final color by blending phosphates together or by the addition of relatively small quantities of phosphate.
  • Halophosphates are relatively inexpensive and are used extensively because of their good efficacy, low cost and wide range of acceptable colors.
  • wall loading characteristics are typically of such a high value as to make the use of halophosphates inappropriate because of their tendency to deteriorate quickly under such high wall loading conditions. In such cases, it is necessary to use comparatively more expensive rare earth phosphors.
  • the wall loading characteristics vary along different portions of the lamp envelope but that near the region of -the- cavity sur.rounding the coil member from which the RF signal is inductively coupled, the wall loading characteristics are sufficiently high as to preclude the use of halophosphates for such area.
  • One way to alleviate the risk of using halophosphates and suffering degradation of the phosphor material would be to coat the entire surface of the lamp envelope inner wall with the rare earth phosphate. Such a measure would allow for a long life light source however, the cost of such a lamp will have been increased significantly by the use of the more expensive rare earth phosphor.
  • a phosphor coating arrangement could be provided for an electrodeless discharge lamp which was both cost effective as a result of using different phosphors based on the wall loading requirements and was easily implemented in a manufacturing process that did not include the addition of multiple steps such as masking and plural coating operations.
  • an electrodeless discharge lamp having a lamp envelope containing a fill of mercury and a rare gas excitable to a discharge state upon the introduction of an RF signal generated by a ballast circuit disposed in a lamp base portion, and wherein the lamp envelope is disposed in at least a partially surrounding relation to a coil member from which the RF signal is output, a phosphor coating arrangement on the lamp envelope in a cost effective manner and one which is easily implemented in a mass production manufacturing process.
  • An outer portion of the lamp envelope is disposed in a spaced apart relation to the coil member whereas an inner cavity portion extending into the lamp envelope along the central axis thereof, is sized to accommodate insertion of the coil member therein and is in close proximity to the coil member thereby subjecting the inner cavity portion to higher wall loading values than that of the outer portion of the lamp envelope.
  • a connection area of the lamp envelope is formed where the inner cavity portion is joined to the outer portion of the lamp envelope, this connection area being disposed at the lowermost portion of the lamp envelope which is inserted into the lamp base for securing the lamp envelope to the lamp base.
  • a rare earth phosphate coating is applied to the inner cavity portion whereas one of either a halophosphate or fluorescent phosphate material is applied to the inner surface of the outer portion of the lamp envelope.
  • the manufacturing operation of joining the inner cavity portion to the outer portion of the lamp envelope is performed after the phosphate coatings are applied thereby obviating the need for masking procedures during the coating applications procedure.
  • Figure 1 is an elevational view in section of an electrodeless lamp constructed in accordance with the present invention.
  • Figure 2 is an elevational view in section of the lamp envelope portion of the lamp of Fig. 1 showing the phosphor coating arrangement of the present invention.
  • a low pressure electrodeless fluorescent lamp 10 includes a lamp envelope 12 having an outer envelope portion 14 and an inner portion identified as re-entrant cavity 16.
  • the re-entrant cavity 16 is essentially cylindrical in shape and extends within the outer envelope portion 14 along the central axis thereof. Extending through the central axis of the re-entrant cavity 16 is an exhaust tube 18 which is shown extending beyond the point at which the re-entrant cavity 16 and the outer envelope portion 14 join to complete the lamp envelope 12, such juncture being identified as reference 20.
  • the outer envelope portion 14 is illustrated as essentially the same shape as a conventional incandescent reflector lamp product. However, other configurations of the outer lamp envelope 14 can be utilized equally as well; for instance, the outer envelope 14 can be configured in the shape of a conventional A-line lamp product or a decorative globe lamp product. Regardless of the shape of the outer envelope portion 14, the lower regions 12b and 14b to each of the outer envelope and re-entrant cavity portions of the lamp envelope 12, defined as juncture 20 will reside inside of the upper rim region of the base housing 22. As will be discussed in hereinafter in further detail, by location of the juncture 20 at this point, the precision of the coating process for the fluorescent material can be somewhat relaxed.
  • the present invention allows for the use of a separate phosphor material application to the outer envelope portion 14 than is used for the re-entrant portion thereby avoiding the need for masking off one portion while the other is being coated with a different phosphor material.
  • the electrodeless discharge lamp 10 of the present invention generates a torroidally shaped discharge 23 within lamp envelope 12.
  • Such discharge 23 is generated upon the introduction of radio frequency (RF) energy to the fill contained within the lamp envelope, such fill being of the conventional type used in standard fluorescent lamps.
  • the RF energy is produced by a resonant circuit portion of a ballast circuit 24 disposed within the housing base 22.
  • the resonant circuit portion includes an excitation coil 26 having a core portion 26a and a winding 26b, and a capacitor 28.
  • the ballast circuit drives the resonant circuit portion with a conditioned signal developed from line power.
  • a tri- phosphor coating material 30 is applied to the lamp envelope in the region covering the re-entrant cavity 16 facing the interior space of lamp envelope 12.
  • the tri-phosphor material 30 can be that material which is typically utilized on conventional compact fluorescent lamps, such material being readily available in the marketplace.
  • the outer envelope portion 14 of lamp envelope 12 are significantly lower and can accommodate the use of the lesser expensive halophosphate material, such material being the same phosphor material as can be utilized in larger conventional fluorescent lamps such as 2 and 4 foot versions of such lamps.
  • the different phosphor material 32 is illustrated as having a different grain size as that material 30 used on the re-entrant cavity.
  • the illustrated lamp 10 is a reflector lamp and as such, includes a reflective coating 34 disposed on the re-entrant cavity 16 and a portion of the outer envelope extending to approximately the equatorial region of the lamp envelope, the dividing line being designated as reference line A-A.
  • each of the re-entrant and outer envelope portions 14, 16 of lamp envelope 12 does not require a precision operation inasmuch as the portion of the lamp envelope 12 at which the re-entrant cavity 16 and outer envelope 14 join, juncture 20, is not visible in the end product but is covered by the upper rim of housing base 22. Furthermore, in the manufacturing operation utilized for produced finished, coated lamp envelopes 12 which are assembled with the housing and ballast portions 22, 24, it can be appreciated that such manufacturing operation is facilitated by the fact that each of the lamp envelope portions 14, 16 can be separately coated without the need for a masking process to accommodate the separate coating materials. After such separate coating process, the lamp envelope portions 14, 16 are joined to form the finished lamp envelope thereby achieving a more cost effective component in that the expensive tri-phosphor material is only used on the area where the wall-loading characteristics require the use of such expensive material.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

L'invention concerne une lampe à décharge (10) sans électrode constituée d'une enveloppe (12) contenant du mercure et un gaz rare et pouvant être excitée jusqu'à atteindre la décharge par application d'énergie HF. Un circuit de protection situé à l'intérieur de la base du boîtier (22) de la lampe est destiné à produire de l'énergie HF à partir d'une source d'alimentation classique. Le circuit de protection comprend une partie formant noyau traversant une cavité rentrante (16) formée à l'intérieur de l'enveloppe. Lors du fonctionnement de la lampe, la cavité rentrante est exposée à des conditions de charge plus fortes au niveau de ses parois qu'à la surface externe de l'enveloppe. Ces conditions de charge supérieures des parois nécessitent l'utilisation de phosphores (30) de terres rares de coût comparativement plus élevé au niveau de la cavité rentrante que sur la partie externe de l'enveloppe, là où il conviendrait d'utiliser des matériaux halophosphates classiques (32). Afin d'obtenir deux couches de phosphore différentes sur une enveloppe unique à un coût raisonnable, on effectue séparément le dépôt de la couche de phosphore sur la cavité rentrante et sur la partie externe, puis on les assemble afin d'obtenir l'enveloppe finie. Le point de jonction entre la partie rentrante et l'enveloppe externe se situe sous une partie du bord supérieur du culot de la lampe et n'est donc pas visible sur le produit fini.
PCT/GB1995/000799 1994-04-11 1995-04-06 Couche de phosphore pour lampe a decharge sans electrode WO1995027999A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE69512166T DE69512166T2 (de) 1994-04-11 1995-04-06 Phosphorbeschichtungseinrichtung für elektrodenlose entladungslampe
JP7526169A JPH08511652A (ja) 1994-04-11 1995-04-06 無電極放電ランプのための蛍光体被膜構造
EP95914458A EP0702846B1 (fr) 1994-04-11 1995-04-06 Couche de phosphore pour lampe a decharge sans electrode

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9407128.9 1994-04-11
GB9407128A GB9407128D0 (en) 1994-04-11 1994-04-11 A phosphor coating arrangement for an electrodeless discharge lamp

Publications (1)

Publication Number Publication Date
WO1995027999A1 true WO1995027999A1 (fr) 1995-10-19

Family

ID=10753339

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1995/000799 WO1995027999A1 (fr) 1994-04-11 1995-04-06 Couche de phosphore pour lampe a decharge sans electrode

Country Status (6)

Country Link
EP (1) EP0702846B1 (fr)
JP (2) JPH08511652A (fr)
CA (1) CA2164711A1 (fr)
DE (1) DE69512166T2 (fr)
GB (1) GB9407128D0 (fr)
WO (1) WO1995027999A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0678897B1 (fr) * 1994-04-18 2002-07-10 General Electric Company Lampe comportant un revêtement luminescent et son procédé de fabrication
DE102009025667A1 (de) * 2009-06-17 2010-12-23 Heraeus Noblelight Gmbh Lampeneinheit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3928786A (en) * 1973-07-02 1975-12-23 Gen Electric Fluorescent lamp having partitioned vapor discharge
FR2321188A1 (fr) * 1975-08-13 1977-03-11 Hollister Donald Procede et dispositif pour produire de la lumiere a partir d'une lampe fluorescente sans electrode
EP0040812A1 (fr) * 1980-05-22 1981-12-02 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Lampe à décharge à basse pression
EP0076503A2 (fr) * 1981-10-06 1983-04-13 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Lampe à décharge à basse pression à un seul culot et méthode de fabrication

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3928786A (en) * 1973-07-02 1975-12-23 Gen Electric Fluorescent lamp having partitioned vapor discharge
FR2321188A1 (fr) * 1975-08-13 1977-03-11 Hollister Donald Procede et dispositif pour produire de la lumiere a partir d'une lampe fluorescente sans electrode
EP0040812A1 (fr) * 1980-05-22 1981-12-02 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Lampe à décharge à basse pression
EP0076503A2 (fr) * 1981-10-06 1983-04-13 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Lampe à décharge à basse pression à un seul culot et méthode de fabrication

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0678897B1 (fr) * 1994-04-18 2002-07-10 General Electric Company Lampe comportant un revêtement luminescent et son procédé de fabrication
DE102009025667A1 (de) * 2009-06-17 2010-12-23 Heraeus Noblelight Gmbh Lampeneinheit

Also Published As

Publication number Publication date
DE69512166D1 (de) 1999-10-21
DE69512166T2 (de) 2000-05-31
JP2006059819A (ja) 2006-03-02
GB9407128D0 (en) 1994-06-01
EP0702846B1 (fr) 1999-09-15
CA2164711A1 (fr) 1995-10-19
JPH08511652A (ja) 1996-12-03
EP0702846A1 (fr) 1996-03-27

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