EP0856871A1 - Lampe fluorescente - Google Patents

Lampe fluorescente Download PDF

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Publication number
EP0856871A1
EP0856871A1 EP97101366A EP97101366A EP0856871A1 EP 0856871 A1 EP0856871 A1 EP 0856871A1 EP 97101366 A EP97101366 A EP 97101366A EP 97101366 A EP97101366 A EP 97101366A EP 0856871 A1 EP0856871 A1 EP 0856871A1
Authority
EP
European Patent Office
Prior art keywords
phosphor
fluorescent lamp
phosphor coating
lamp according
glass bulb
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Withdrawn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
EP97101366A
Other languages
German (de)
English (en)
Inventor
Hitoshi c/o NEC Home Electronics Ltd. Hata
Yoshiaki c/o NEC Home Electronics Ltd Nagashima
Norimasa c/o NEC Home Electronics Ltd. Mizobe
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to EP97101366A priority Critical patent/EP0856871A1/fr
Publication of EP0856871A1 publication Critical patent/EP0856871A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • H01J61/48—Separate coatings of different luminous materials
    • 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
    • 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
    • H01J61/44—Devices characterised by the luminescent material

Definitions

  • This invention relates to a fluorescent lamp, and particularly to the improvement of a fluorescent lamp that emits an afterglow sufficient to allow discernment of objects for at least ten minutes after the lamp is extinguished.
  • Fluorescent lamps for illumination purposes are generally constructed by forming a phosphor coating composed of, for example, a halophosphate phosphor or rare-earth phosphor on the inner surface of a glass bulb.
  • a straight-tube 40-watt fluorescent lamp using a halophosphate phosphor produces a luminous intensity of 2700-3100 (lm) and is widely used for such purposes as lighting offices, large stores, theaters, baths, and underground shopping malls.
  • the Fire Law and Building Standards Law stipulate the provision of guide lights or emergency lighting.
  • Such guide lights or emergency lighting are constructed to allow use of a commercial power source during normal operation, but during emergencies (blackouts), to allow use of an internal battery to light a fluorescent lamp or light bulb at an illuminance of 1 lx or greater for at least 20-30 minutes. During emergencies, therefore, a minimum illuminance at the ground surface of 1 lx or greater can be ensured to enable safe and speedy evacuation even when the commercial power source is interrupted and normal lighting apparatus are nonfunctional.
  • guide lights or emergency lighting are costly and, compared to normal lighting fixtures, few in number.
  • passageway guide lights are arranged along lower wall surfaces, people far from the wall will be a considerably less aware of the passageway guide lamps than people close to the wall during the confusion of an evacuation, and this reduced awareness may hinder the speed of evacuation.
  • smooth and speedy evacuation may be hindered by the lack of light during a blackouts caused by a disaster, and evacuation of children or disabled persons may be hindered.
  • the present applicants therefore proposed a fluorescent lamp having a phosphor coating composed of one or more varieties of phosphors on the inner surface of a glass bulb, this phosphor coating being a mixture including at least 0.2 mg per 1 cm 2 of a phosphor having a long afterglow property.
  • an illuminance of at least 0.05 lx which allows discernment of objects, can be obtained even after the passage of 500 seconds after the fluorescent lamp has been extinguished, and the fluorescent lamp therefore provides the functions of both a guide light in a blackout as well as an ordinary night-light.
  • this fluorescent lamp produces a brightness of only 40% that of ordinary fluorescent lamps for lighting purposes, and this leads to the problem that the number of lamps installed for ordinary use must be increased to attain the desired illuminance at floor level, thereby increasing the financial burden of using such lamps.
  • the object of the present invention is to provide a fluorescent lamp that allows an improvement in the degree to which light can be put to practical use through a comparatively simple construction and with no loss in extended afterglow property.
  • the present invention is a fluorescent lamp formed by layering first and second phosphor coatings composed of one or more types of phosphors on the inner surface of a glass bulb, wherein the first phosphor coating on the glass bulb side is formed from a phosphor having a long afterglow property.
  • the application amount of phosphor having a long afterglow property of the first phosphor coating is set to at least 0.2 mg per 1 cm 2
  • the second phosphor coating is formed from a phosphor having a long afterglow property
  • the second phosphor coating is formed from one or more rare-earth phosphors.
  • an ultraviolet light reflection layer is formed between the glass bulb and first phosphor coating, and this ultraviolet light reflection layer is constituted from alumina or magnesia.
  • a transparent conductive film is formed between the glass bulb and the first phosphor coating, and in addition, an ultraviolet light reflection layer is formed between this conductive film and the first phosphor coating.
  • the outer surface of the glass bulb is covered by a transparent protective layer, and in addition, this protective layer is constituted from a resin tube.
  • Fig. 1 is a sectional view showing the principal components of the first embodiment of a fluorescent lamp according to the present invention.
  • Fig. 2 is a sectional view showing the principal components of the second embodiment of the present invention.
  • Fig 3 is a sectional view showing the principal components of the third embodiment of the present invention.
  • Fig. 4 is a sectional view showing the principal components of the fourth embodiment of the present invention.
  • Fig. 5 is a graph showing the relation of the afterglow illuminance to the time elapsed after extinguishing for an embodiment of the present invention.
  • Fig. 6 is an enlarged view of the illuminance scale of Fig. 5.
  • a first phosphor coating 2 composed of at least one type of phosphor having a long afterglow property is formed on the inner surface of glass bulb 1. This first phosphor coating 2 is formed at an application amount of at least 0.2 mg per 1 cm 2 .
  • a chemical compound that can be represented by, for example, the general formula MAl 2 O 4 , wherein M is a light-accumulating phosphor in which a chemical compound composed of at least one metal element selected from the group composed of calcium, strontium, and barium is made the mother crystal, and in addition to the use of europium (Eu) as an activator, an element such as dysprosium (Dy) or neodymium (Nd) is used as a co-activator.
  • Eu europium
  • Dy dysprosium
  • Nd neodymium
  • the average particle diameter of these phosphors is set to, for example, 2-12 ⁇ m (according to the Fischer Subsieve Sizer Method(FSSS)).
  • Second phosphor coating 3 composed of one or more phosphors is layered over first phosphor coating 2.
  • An application amount within the range of 2-5 mg per 1 cm 2 is effective for this second phosphor coating 3, with 3.3 mg being the optimum application amount, and the layer is formed by mixing one or more types of, for example, halophosphate phosphors (Ca 10 (PO 4 ) 6 FCl : Sb/Mn, etc.) or rare-earth phosphors (Y 2 O 3 : Eu, LaPO 4 : Ce/Tb, (SrCaBaMg) 5 (PO 4 ) 3 Cl : Eu, etc.).
  • the layer thickness can be made relatively uniform by setting the application direction at the time of forming second phosphor coating 3 opposite to the application direction at the time of forming first phosphor coating 2.
  • electrodes 4 are arranged at both ends of glass bulb 1.
  • At least second phosphor coating 3 on the discharge path side is constituted from a phosphor such as a rare-earth phosphor used in ordinary fluorescent lamps for lighting purposes, and consequently, when the lamp is turned on, this phosphor is efficiently excited by ultraviolet light of, for example, 253.7 nm wavelength, and a significant increase in brightness can therefore be realized.
  • first phosphor coating 2, being formed on the glass bulb side is excited by ultraviolet light passing through second phosphor coating 3 and also emits light.
  • second phosphor coating 3 is excited by ultraviolet light passing through second phosphor coating 3 and also emits light.
  • first phosphor coating 2 can maintain an illuminance on the order of 0.05 lx, which allows discernment of objects, over a long time interval after the fluorescent lamp is extinguished.
  • the use of the fluorescent lamp of the present invention obviates the use of the miniature bulbs on the order of 5 W which are often mounted in household lighting fixtures for use as night-lights, thereby allowing both a reduction in the cost for light fixtures as well as a reduction in electrical power use.
  • Fig. 2 shows another embodiment of the present invention in which a transparent ultraviolet light reflection layer 5 is formed between glass bulb 1 and first phosphor coating 2.
  • This ultraviolet light reflection layer 5 is formed from, for example, alumina (Al 2 O 3 ) or magnesia (MgO) having an average particle diameter of less than, for example, 0.1 ⁇ m, and preferably between 30 and 50 nm.
  • First and second phosphor coatings 2 and 3 are excited by ultraviolet light of, for example, 253.7 nm wavelength produced by discharge between electrodes 4, but while the phosphor located on the discharge path side is efficiently excited, the phosphor located on the glass bulb side and farther from the discharge path tends to be excited at a reduced level of efficiency.
  • ultraviolet light that passes through first and second phosphor coatings 2 and 3 is reflected by ultraviolet light reflection layer 5, and phosphor located on the glass bulb side is therefore excited both by ultraviolet light passing through and by ultraviolet light that is reflected back.
  • the luminous efficacy of this lamp can consequently be increased.
  • ultraviolet light reflection layer 5 from, for example, alumina allows suppression of contact by mercury with glass bulb 1, thereby reducing or eliminating changes in color due to solarization.
  • Fig. 3 shows a different embodiment of the present invention in which a transparent conductive film 6 is formed between glass bulb 1 and first phosphor coating 2.
  • This conductive film 6 is formed by, for example, spray application of a liquid containing tin chloride onto the inner surface of glass bulb in a heated state.
  • This film 6 has a resistance of, for example, 1-1000 k ⁇ level.
  • This embodiment can be applied to lighting fixtures equipped with a ignition circuit device for rapid-start lighting, and is ideal for use in locations such large stores, theaters, and underground shopping malls where a reduction in time for maintenance is desirable.
  • FIG. 4 shows yet another embodiment of the present invention in which a protective layer 7 is formed on the outer surface of glass bulb 1.
  • This protective layer 7 is composed of, for example, a resin material such as a polyethylene terephtalate (PET) having a thickness set to, for example, 100-150 ⁇ m.
  • PET polyethylene terephtalate
  • This protective layer 7 is formed by first preparing a tube form, and after inserting glass bulb 1, heating to 150-200°C to cause the tube to shrink and come into close contact with the outer surface of glass bulb 1.
  • an ultraviolet light absorbent such as titanium oxide (TiO 2 ) is mixed into protective layer 7, not only can the light resistance of protective layer 7 be improved, but the protective layer 7 can also serve as an ultraviolet light blocking layer.
  • This construction may also be applied to the fluorescent lamps shown in Figs. 2 and 3.
  • a protective layer 7 made of resin is formed on the outer surface of glass bulb 1, and this protective layer 7 not only prevents glass bulb 1 from shattering should breakage occur in an emergency, but also allows emission of enough light when the bulb is broken to enable discernment of objects, thereby enabling smooth and speedy evacuation.
  • this fluorescent lamp may be removed from a light fixture and used as a substitute for a flashlight, an example which illustrates that the present invention can be of service in countless ways beyond serving as a guide light for evacuation.
  • the present invention is not restricted to any of the above-described embodiments, and may of course be applied to straight-tube fluorescent lamps other than a 40-watt model, as well as to circular fluorescent lamps, compact fluorescent lamps, and globe fluorescent lamps.
  • a phosphor having a long afterglow property any substance having long afterglow properties may be used in addition to those described in the embodiments hereinabove such as a europium-, neodymium-, and yttrium-activated calcium aluminate phosphor (CaAl 2 O 4 : Eu/Nd/Y).
  • triphosphor fluorescent lamps of the three or more types of phosphors within the second phosphor coating, at least one type can be exchanged for a phosphor having long afterglow properties.
  • the inventors of the present invention first fabricated an FL40 fluorescent lamp using a cerium- and terbium-activated lanthanum phosphate phosphor (LaPO 4 : Ce/Tb --- Phosphor A) having a light emission peak at 544 nm wavelength and a europium- and dysprosium-activated strontium aluminate phosphor (SrAl 2 O 4 : Eu/Dy --- Phosphor B) having a long afterglow property and moreover, having a light emission peak of 510 nm wavelength, and then measured total luminous flux to obtain the results shown in the following Chart 1.
  • the application amounts of the phosphors was a uniform 4.0 mg/cm 2 for each of the first and second phosphor coatings. 1st phosphor coating 2nd Phosphor coating Total luminous flux (relative value)
  • the inventors of the present invention additionally fabricated an FL40 fluorescent lamp by applying to the inner surface of a glass bulb a europium- and dysprosium- activated strontium aluminate phosphor (Sr 4 Al 14 O 25 : Eu/Dy --- Phosphor C) having a light emission peak of 490 nm wavelength as the first phosphor coating, and as the second phosphor coating, prepared a mixture according to the proportions shown in chart 3 including a europium-activated yttrium oxide phosphor (Y 2 O 3 : Eu --- phosphor D) having a light emission peak of 622 nm wavelength, phosphor A, and a europium-activated strontium-calcium-barium-magnesium phosphate phosphor ((SrCaBaMg) 5 (PO 4 ) 3 Cl : Eu ---Phosphor E) having a light emission Peak of 453 nm wavelength.
  • the application amounts of the first and second phosphor coatings were 5.3 and 3.4 mg/cm 2 , respectively.
  • Phosphor coating Phosphors used Proportions (wt%) Application amount (mg/cm 2 ) 1st coating C Phosphor ⁇ 5.3 2nd coating D Phosphor 32.2 3.4 A Phosphor 23.9 E Phosphor 43.9
  • Figs. 5 and 6 Illuminance with respect to time elapsed following extinguishing the lamp (afterglow property) is shown in Figs. 5 and 6.
  • Fig. 6 is substantially identical to Fig. 5 and differs only in that the illuminance scale of the vertical axis has been magnified.
  • the afterglow illuminance is 0.2 lx even 500 seconds after extinguishing the lamp, and this level of illuminance allows ample discernment of objects, enabling a smooth and speedy evacuation.
  • this fluorescent lamp maintained an illuminance of more than 0.05 lx even after the passage of 2 hours.
  • the second phosphor coating on the discharge path side is constructed from a phosphor such as a rare-earth phosphor used in ordinary fluorescent lamps for illumination purposes, and as a result, this phosphor coating is efficiently excited by ultraviolet light of, for example, 253.7 nm wavelength when the lamp is turned on, thereby allowing a significant increase in brightness.
  • the first phosphor coating is formed such that the application amount is 0.2 mg or more per 1 cm 2 on the glass bulb side, and consequently, this coating is excited by ultraviolet light passing through the second phosphor coating and emits light. Nearly all light emitted when the bulb is extinguished is emitted directly toward the exterior from the glass bulb. Accordingly, light emitted from the first phosphor coating can be directed toward the exterior with virtually no attenuation and can be effectively used as a guide light in emergencies or as a night-light.
  • an ultraviolet light reflection layer is formed between the glass bulb and the first phosphor coating, ultraviolet light that would ordinarily have escaped past the glass bulb is reflected back by the reflection layer and acts to excite the phosphor, thereby contributing an improvement in brightness.
  • a translucent conductive film is additionally formed between the glass bulb and the first phosphor coating, the start-up characteristics of the fluorescent lamp can be improved.
  • a protective layer made of, for example, resin is formed on the outer surface of the glass bulb, not only can shattering of the bulb be prevented if the bulb should break in an emergency, but the bulb can still produce sufficient light to allow discernment of objects even in a broken state, and can also be removed from the light fixture and used as a substitute for a flashlight.

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  • Vessels And Coating Films For Discharge Lamps (AREA)
EP97101366A 1997-01-29 1997-01-29 Lampe fluorescente Withdrawn EP0856871A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97101366A EP0856871A1 (fr) 1997-01-29 1997-01-29 Lampe fluorescente

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97101366A EP0856871A1 (fr) 1997-01-29 1997-01-29 Lampe fluorescente

Publications (1)

Publication Number Publication Date
EP0856871A1 true EP0856871A1 (fr) 1998-08-05

Family

ID=8226420

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97101366A Withdrawn EP0856871A1 (fr) 1997-01-29 1997-01-29 Lampe fluorescente

Country Status (1)

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EP (1) EP0856871A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999023414A1 (fr) * 1997-10-31 1999-05-14 Jorge Matarrodona Martinez Lampe amelioree
AU749242B2 (en) * 1997-10-31 2002-06-20 Jorge Matarrodona Martinez Improved lamp
US6528938B1 (en) 2000-10-23 2003-03-04 General Electric Company Fluorescent lamp having a single composite phosphor layer
WO2003102464A1 (fr) * 2002-06-04 2003-12-11 Luna Glow Pty Ltd Protege-lampe ou revetement phosphorescent
US6917154B2 (en) 2002-02-27 2005-07-12 Charles Bolta Scotopic after-glow lamp
EP1707611A2 (fr) * 2000-09-08 2006-10-04 Nanosolutions GmbH Synthèse de nanoparticules
EP1734562A2 (fr) * 2005-06-16 2006-12-20 Nanoforce Technologies Corporation Feuille luminescente avec filtration ultraviolet et protection contre l'explosion pour lampes fluorescentes
US7300327B2 (en) 2002-02-27 2007-11-27 Charles Bolta Method for constructing a scotopic after-glow lamp
CN104791707A (zh) * 2014-01-16 2015-07-22 四川新力光源股份有限公司 一种应急灯
CN105090880A (zh) * 2014-05-23 2015-11-25 重庆四联光电科技有限公司 应急照明日光灯及其制造方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5293184A (en) * 1976-01-30 1977-08-05 Nec Home Electronics Ltd Manufacturing method for fluorescent lamp
US4705986A (en) * 1984-08-02 1987-11-10 Matsushita Electronics Corporation High color rendering fluorescent lamp
JPH01248454A (ja) * 1988-03-30 1989-10-04 Toshiba Lighting & Technol Corp けい光ランプ
JPH03280345A (ja) * 1990-03-28 1991-12-11 Toshiba Lighting & Technol Corp 反射形紫外線ランプ
JPH05109387A (ja) * 1991-10-18 1993-04-30 Matsushita Electron Corp 電球色蛍光ランプ
EP0622440A1 (fr) * 1993-04-28 1994-11-02 Nemoto & Co., Ltd. Matériau phosphorescent
EP0710709A1 (fr) * 1994-11-01 1996-05-08 Nemoto & Co., Ltd. Matériau phosphorescent

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5293184A (en) * 1976-01-30 1977-08-05 Nec Home Electronics Ltd Manufacturing method for fluorescent lamp
US4705986A (en) * 1984-08-02 1987-11-10 Matsushita Electronics Corporation High color rendering fluorescent lamp
JPH01248454A (ja) * 1988-03-30 1989-10-04 Toshiba Lighting & Technol Corp けい光ランプ
JPH03280345A (ja) * 1990-03-28 1991-12-11 Toshiba Lighting & Technol Corp 反射形紫外線ランプ
JPH05109387A (ja) * 1991-10-18 1993-04-30 Matsushita Electron Corp 電球色蛍光ランプ
EP0622440A1 (fr) * 1993-04-28 1994-11-02 Nemoto & Co., Ltd. Matériau phosphorescent
EP0710709A1 (fr) * 1994-11-01 1996-05-08 Nemoto & Co., Ltd. Matériau phosphorescent

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 7737, Derwent World Patents Index; Class L03, AN 77-65871Y, XP002034092 *
DATABASE WPI Section Ch Week 9322, Derwent World Patents Index; Class L03, AN 93-178281, XP002034091 *
PATENT ABSTRACTS OF JAPAN vol. 013, no. 594 (E - 867) 27 December 1989 (1989-12-27) *
PATENT ABSTRACTS OF JAPAN vol. 016, no. 101 (E - 1177) 12 March 1992 (1992-03-12) *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU749242B2 (en) * 1997-10-31 2002-06-20 Jorge Matarrodona Martinez Improved lamp
US6479936B1 (en) 1997-10-31 2002-11-12 Jorge Matarrodona Martinez Afterglow lamp with multiple phosphor coatings
WO1999023414A1 (fr) * 1997-10-31 1999-05-14 Jorge Matarrodona Martinez Lampe amelioree
EP1707611A2 (fr) * 2000-09-08 2006-10-04 Nanosolutions GmbH Synthèse de nanoparticules
US6528938B1 (en) 2000-10-23 2003-03-04 General Electric Company Fluorescent lamp having a single composite phosphor layer
US6917154B2 (en) 2002-02-27 2005-07-12 Charles Bolta Scotopic after-glow lamp
US7300327B2 (en) 2002-02-27 2007-11-27 Charles Bolta Method for constructing a scotopic after-glow lamp
WO2003102464A1 (fr) * 2002-06-04 2003-12-11 Luna Glow Pty Ltd Protege-lampe ou revetement phosphorescent
AU2003229124B2 (en) * 2002-06-04 2009-04-23 Lwp International Pty Ltd Phosphorescent light cover or coating
EP1734562A2 (fr) * 2005-06-16 2006-12-20 Nanoforce Technologies Corporation Feuille luminescente avec filtration ultraviolet et protection contre l'explosion pour lampes fluorescentes
EP1734562A3 (fr) * 2005-06-16 2007-09-19 Nanoforce Technologies Corporation Feuille luminescente avec filtration ultraviolet et protection contre l'explosion pour lampes fluorescentes
CN104791707A (zh) * 2014-01-16 2015-07-22 四川新力光源股份有限公司 一种应急灯
CN105090880A (zh) * 2014-05-23 2015-11-25 重庆四联光电科技有限公司 应急照明日光灯及其制造方法

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