EP0330808A1 - Niederdruckgasentladungslampe - Google Patents

Niederdruckgasentladungslampe Download PDF

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Publication number
EP0330808A1
EP0330808A1 EP88850215A EP88850215A EP0330808A1 EP 0330808 A1 EP0330808 A1 EP 0330808A1 EP 88850215 A EP88850215 A EP 88850215A EP 88850215 A EP88850215 A EP 88850215A EP 0330808 A1 EP0330808 A1 EP 0330808A1
Authority
EP
European Patent Office
Prior art keywords
fluorescent tube
tubular
envelope
lamp according
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.)
Withdrawn
Application number
EP88850215A
Other languages
English (en)
French (fr)
Inventor
Torsten Axelsson
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.)
Auralight AB
Original Assignee
Lumalampan AB
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 Lumalampan AB filed Critical Lumalampan AB
Publication of EP0330808A1 publication Critical patent/EP0330808A1/de
Withdrawn legal-status Critical Current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
    • H01J61/34—Double-wall vessels or containers
    • 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
    • H01J61/72—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of easily vaporisable metal vapour, e.g. mercury

Definitions

  • the present invention relates to a gas discharge lamp of the tubular kind filled with gas or vapour at low pressures, e.g. a fluorescent tube.
  • the gas discharge lamp has properties which render it especially suited for use in low ambient temperatures.
  • the lamp is therefore particularly suited for outdoor use in the Nordic winter climate, and also for illuminating cold storage and freeze storage facilities.
  • Fluorescent lamps are widely used in the open, because the fluorescent lamp gives light more efficiently than an incandescent lamp.
  • fluorescent lamps In addition to street lighting, fluorescent lamps have thus been used to illumi­nate road signs, as canopy lighting, e.g. in railway stations, to illuminate loading piers and gasoline stations, and to an increasing extent as a means of illumination in both freestanding and surface-mounted advertising signs.
  • fluorescent lamps, or tubes are used to illuminate signs, and not only to illuminate such signs from within, it is desirable that the luminous flux is uniform throughout the sign, irrespective of the ambient air temperature.
  • a fluorescent tube which is mounted in known kinds of lamp casings or enclosures will, to some extent, be self-heating, since the air present in the casing is able to conduct heat away from the actual fluorescent tube only to a very limited extent.
  • This problem applies to fluorescent tubes incorporated in advertising signs (company name signs) and road signs (traffic), such as overhead lane-destination signs of partially translucent design, and also to fluorescent tubes which are mounted in enclosed lamp fittings. With the ambient air stationary and the air temperature beneath 0°C, this self-heating effect will result in a surface temperature of +15°C on the coldest part of the fluorescent tube.
  • the lamp casings or enclosures absorb all of the increase in luminous flux achieved by self-heating of the fluorescent tube.
  • the great majority of fluorescent lamps for outdoor use are of the kind which have reflectors fitted over the fluorescent tube, but which lack the provision of a casing.
  • the purpose of encasing fluorescent lamps is to protect the fluorescent tubes from damage through mechanical causes, and the lighting requirement has been made secondary to the need of protecting the lamp.
  • Tunnels are another area of use in which fluorescent tubes or lamps can be subjected to the effects of low ambient temperatures.
  • the air flow through tunnels, even when the tunnels have a length of several hundred meters, is so large that any heat which may be radiated from the surrounding rock or earth is unable to supplement heating of the sur­faces of the fluorescent tube.
  • the luminous flux will decrease exponen­tially with falling air temperatures. This can have a serious consequence, for instance, on a cold sunny winter's day, a car driver will see the road with an illumination strength of close to 100 000 lux.
  • this driver enters an illuminated tunnel his eyes must adjust to an illuminance which is far below 100 lux. Road safety and the driver's own feeling of security are assisted by the fact that the fluorescent lamps in the tunnel maintain a practically normal luminous flux, even in very cold weather conditions.
  • the luminous flux is reduced to a third of its original value when the ambient temperatures lies within a range of +10°C to 0°C.
  • the matter is made more serious by the fact that the luminous flux of a 26 mm tube at +10°C is 20% lower than the luminous flux of a 38 mm tube of corresponding power.
  • the object of the present invention is to solve the problems which are associated with the use of narrow fluorescent tubes in freezing temperatures and to provide a lamp which has high illuminance at low temperatures.
  • This object is realized in accordance with the invention with a narrow fluorescent tube which is surrounded along the whole of its length by a fixed transparent outer tube, for instance a glass tube.
  • a fixed transparent outer tube for instance a glass tube.
  • a gas-discharge lamp in the form of a tube is surrounded by a glass tube or envelope, which may be transparent or opalescent.
  • the ends of this envelope are fixed to the cathode-containing ends of the glass tube of the discharge lamp, such as to leave a tubular space of constant width between the envelope and the tube.
  • this space may be allowed to communicate with the ambient air, such communication may result in condensa­ tion problems. Consequently, it is preferred to provide seals at the ends of the lamp, between the envelope and tube.
  • These seals may have the form of polymer sealing rings, or may otherwise comprise aging-resistant gas-­impermeable material. From the aspect of manufacture, it is a simple matter to flange or neck-down the ends of the envelope while heating the same, so that these ends fuze together with the inwardly lying glass tube, suitably before fitting end caps to the tube.
  • the envelope surrounding the tube is fixed thereto, an advantage is afforded when the space between the tube and envelope is filled with a pure gas, so that no light losses will occur.
  • the gas most preferred in this respect is dry, dust-free air, although in particular cases the gas may comprise a noble gas or a mixture of such gases.
  • the gas in the aforesaid space may be kept at atmospheric pressure, although in combination with the tube wall, which is normally less than 2 mm thick, and in order to increase the heat insulating ability, the gas is preferably held at a pressure beneath atmospheric.
  • the insulating ability is also dependent on the width of the space, which width may be from 2-10 mm, depending on the intended lamp application.
  • the tubular space will have a width of 5 mm.
  • an exchange of heat-transporting air may take place between the other surfaces of the inwardly located fluorescent tube and the inner surface of the tubular envelope. This will increase convection and part of the advantage afforded by the invention will be lost.
  • An excessively narrow tubular space will not give the desired effect, unless the space is completely evacuated.
  • An optimum space width has therefore been judged to be from 4 to 8 mm.
  • the inner surface of the envelope may be coated with one or more fluorescent substances. This coating will convert to visible light any ultraviolet light that penetrates through the fluorescent layer of the fluorescent tube and the glass wall thereof. These fluorescent substances on the envelope may be selected to provide a desired colour complement in the light emitted.
  • the light may be directed positively from the lamp fitting, normally downwards.
  • the inner surface of the tubular envelope is coated with a reflective material, through an angle of arc of up to 180°C.
  • this embodiment affords the further advantage of reflecting heat rays back to the discharge chamber of the lamp.
  • the resultant increase in the temperature of the discharge chamber corresponds to an increase in illumination strength of more than 20% when the ambient temperature is beneath +10°C.
  • Fluorescent tubes of this construction can also be turned through 180°C in reflector-fitted lamp fittings, resulting in a type of top-reflection. This gives a very soft light and promotes self-heating of the lamp.
  • the inventive lamp is believed to afford a good solution to the illuminating requirements expressed by those who work on oil rigs in arctic climates.
  • the outer envelope of the inventive lamp will also afford protection against mechanical damage.
  • the inwardly located fluorescent tube is likely to remain intact and the lamp to continue to give-out light, without risk of sparking between the cathodes igniting gas located around the oil platform or rig.
  • the inventive lamp thus provides in this instance a safety lamp which will reduce the explosion hazards of oil platforms and rigs.
  • the exemplifying embodiment of the inventive fluorescent lamp 1 illustrated in Figure 1 comprises a fluorescent tube 2 which has a diameter of 26 mm and which is fitted at both ends with lamp bases 3 having connector pins 4.
  • the tube 2 also has cathodes placed on a terminal foot 5 in the usual manner, the cathodes in this case being surrounded by elec­trode screens 6.
  • the electrical contact pins extend through the foot, or base, 5 to the cathode current distributor 7.
  • the fluorescent tube 2 of the illustrated embodiment is surrounded by a tubular glass envelope 8 which is transparent and has an outer diameter of 38 mm and the ends of which are drawn or necked slightly inwards.
  • the ends of the tubular envelope 8 are inserted into ring-shaped grooves in polymer rings 9 which are press-fitted onto the bases 3.
  • the tubular envelope is fitted with the aid of polymer rings 9 in a chamber which is under a partial vacuum and to which only dry, filtered air is introduced, the air present in the tubular space 10 between the fluorescent tube 2 and the tubular envelope 8 will be free from dust.
  • the application of atmospheric pressure will assist in holding the polymer rings 9 tightly and sealingly between the envelopes 8 and respective lamp bases 3.
  • the polymer rings 9 will conveniently incorporate cavities for accommodating silica gel or some other powdered hygroscopic material.
  • the inner surfaces of the envelope of the inventive lamp may be coated with substances which will filter out undesired light. This technique enables critical ultraviolet lines to be further reduced with the aid of light-absorbing or fluorescent sub­stances.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Gas Separation By Absorption (AREA)
  • Secondary Cells (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
EP88850215A 1988-03-02 1988-06-17 Niederdruckgasentladungslampe Withdrawn EP0330808A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8800747A SE8800747D0 (sv) 1988-03-02 1988-03-02 Lagtrycks-gasurladdningslampa
SE8800747 1988-03-02

Publications (1)

Publication Number Publication Date
EP0330808A1 true EP0330808A1 (de) 1989-09-06

Family

ID=20371561

Family Applications (2)

Application Number Title Priority Date Filing Date
EP88850215A Withdrawn EP0330808A1 (de) 1988-03-02 1988-06-17 Niederdruckgasentladungslampe
EP89850075A Expired - Lifetime EP0331660B1 (de) 1988-03-02 1989-03-02 Niederdruckgasentladungslampe

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP89850075A Expired - Lifetime EP0331660B1 (de) 1988-03-02 1989-03-02 Niederdruckgasentladungslampe

Country Status (5)

Country Link
EP (2) EP0330808A1 (de)
AT (1) ATE124573T1 (de)
DE (1) DE68923197T2 (de)
ES (1) ES2073459T3 (de)
SE (2) SE8800747D0 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19737920A1 (de) * 1997-08-27 1999-03-04 Walter Dipl Chem Dr Rer N Tews Niederdruck-Gasentladungslampe mit erhöhter Lebensdauer
EP0987737A1 (de) * 1998-09-18 2000-03-22 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Leuchtstofflampe
WO2001020642A1 (en) * 1999-09-11 2001-03-22 Gl Displays, Inc. Gas discharge fluorescent device
US6515433B1 (en) 1999-09-11 2003-02-04 Coollite International Holding Limited Gas discharge fluorescent device
WO2005031796A1 (en) * 2003-09-30 2005-04-07 Auralight International Ab Fluorescent lamp for cold environments

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4215674A1 (de) * 1992-05-13 1993-11-18 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Niederdruckentladungslampe
US6316872B1 (en) 1995-09-22 2001-11-13 Gl Displays, Inc. Cold cathode fluorescent lamp
US6201352B1 (en) 1995-09-22 2001-03-13 Gl Displays, Inc. Cold cathode fluorescent display
US5834889A (en) 1995-09-22 1998-11-10 Gl Displays, Inc. Cold cathode fluorescent display
US6310436B1 (en) 1995-09-22 2001-10-30 Gl Displays, Inc. Cold cathode fluorescent lamp and display
CN1161819C (zh) * 1998-05-06 2004-08-11 泛海企业有限公司 冷阴极气体放电发光装置
JP2009524903A (ja) * 2006-01-25 2009-07-02 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Ｔｌｄ低圧ガス放電ランプ
SE534541C2 (sv) * 2009-09-16 2011-09-27 Auralight Int Ab Kompaktlysrör anpassat för kalla utrymmen försett med isolerande organ

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2611894A1 (de) * 1975-03-24 1976-10-14 Gte Sylvania Inc Uv-leuchtstoffentladungslampe mit reflektorfilm im innern
EP0011346A1 (de) * 1978-11-17 1980-05-28 Koninklijke Philips Electronics N.V. Niederdruck-Natriumdampf-Entladungslampe
GB1574619A (en) * 1976-02-25 1980-09-10 Westinghouse Electric Corp Fluorescent lamps and fluorescent lamp assemblies
JPS59128752A (ja) * 1983-01-12 1984-07-24 Karupu Kogyo Kk 螢光灯エンドキヤツプ用樹脂組成物
US4710679A (en) * 1985-12-06 1987-12-01 Gte Laboratories Incorporated Fluorescent light source excited by excimer emission
DD253702A1 (de) * 1983-12-19 1988-01-27 Adl Inst Gemueseproduktion Gasentladungsstrahler fuer effektive strahlungsemission bei niedrigen umgebungstemperaturen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3179792A (en) * 1962-09-06 1965-04-20 Weiss Harry Fluorescent lamp
US3358167A (en) * 1965-10-18 1967-12-12 Gen Electric Jacketed discharge lamp
US4131589A (en) * 1976-12-13 1978-12-26 General Electric Company Low temperature transmission room temperature vulcanizable silicone compositions
US4221693A (en) * 1979-03-02 1980-09-09 Getson John C Composition free of surface cure inhibition and method for preparing the same
JPS59217939A (ja) * 1983-05-25 1984-12-08 Hitachi Ltd 二重管からなる有色螢光ランプ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2611894A1 (de) * 1975-03-24 1976-10-14 Gte Sylvania Inc Uv-leuchtstoffentladungslampe mit reflektorfilm im innern
GB1574619A (en) * 1976-02-25 1980-09-10 Westinghouse Electric Corp Fluorescent lamps and fluorescent lamp assemblies
EP0011346A1 (de) * 1978-11-17 1980-05-28 Koninklijke Philips Electronics N.V. Niederdruck-Natriumdampf-Entladungslampe
JPS59128752A (ja) * 1983-01-12 1984-07-24 Karupu Kogyo Kk 螢光灯エンドキヤツプ用樹脂組成物
DD253702A1 (de) * 1983-12-19 1988-01-27 Adl Inst Gemueseproduktion Gasentladungsstrahler fuer effektive strahlungsemission bei niedrigen umgebungstemperaturen
US4710679A (en) * 1985-12-06 1987-12-01 Gte Laboratories Incorporated Fluorescent light source excited by excimer emission

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPABN, Unexamined Applications, C Field, Vol. 8, No. 256, November 22, 1984 The Patent Office Japanese Government page 40 E 280, & JP-A-59 128 752 (Karupu Kosyo) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19737920A1 (de) * 1997-08-27 1999-03-04 Walter Dipl Chem Dr Rer N Tews Niederdruck-Gasentladungslampe mit erhöhter Lebensdauer
EP0987737A1 (de) * 1998-09-18 2000-03-22 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Leuchtstofflampe
WO2001020642A1 (en) * 1999-09-11 2001-03-22 Gl Displays, Inc. Gas discharge fluorescent device
US6515433B1 (en) 1999-09-11 2003-02-04 Coollite International Holding Limited Gas discharge fluorescent device
WO2005031796A1 (en) * 2003-09-30 2005-04-07 Auralight International Ab Fluorescent lamp for cold environments

Also Published As

Publication number Publication date
EP0331660A2 (de) 1989-09-06
SE8900728L (sv) 1989-09-03
SE8900728D0 (sv) 1989-03-02
DE68923197D1 (de) 1995-08-03
DE68923197T2 (de) 1995-11-09
SE467279B (sv) 1992-06-22
SE8800747D0 (sv) 1988-03-02
ATE124573T1 (de) 1995-07-15
ES2073459T3 (es) 1995-08-16
EP0331660A3 (de) 1991-01-23
EP0331660B1 (de) 1995-06-28

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