EP0377899A2 - Beleuchtungsentladungslampe - Google Patents

Beleuchtungsentladungslampe Download PDF

Info

Publication number
EP0377899A2
EP0377899A2 EP89124095A EP89124095A EP0377899A2 EP 0377899 A2 EP0377899 A2 EP 0377899A2 EP 89124095 A EP89124095 A EP 89124095A EP 89124095 A EP89124095 A EP 89124095A EP 0377899 A2 EP0377899 A2 EP 0377899A2
Authority
EP
European Patent Office
Prior art keywords
lutetium
light
discharge lamp
sealed
lighting discharge
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Withdrawn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
EP89124095A
Other languages
English (en)
French (fr)
Other versions
EP0377899A3 (de
Inventor
Mitsuo Narita
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.)
Ushio Denki KK
Original Assignee
Ushio Denki KK
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 Ushio Denki KK filed Critical Ushio Denki KK
Publication of EP0377899A2 publication Critical patent/EP0377899A2/de
Publication of EP0377899A3 publication Critical patent/EP0377899A3/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/84—Lamps with discharge constricted by high pressure
    • H01J61/86—Lamps with discharge constricted by high pressure with discharge additionally constricted by close spacing of electrodes, e.g. for optical projection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature

Definitions

  • This invention relates to a lighting discharge lamp.
  • the present inventor has carried out an extensive investigation. As a result, it has been found that when lutetium is sealed in a specific proportion within a light-emitting tube, high color rendering properties can be obtained while maintaining the emission of white light with high efficiency and the above problems can be solved, leading to completion of the present invention.
  • An object of this invention to provide a lighting discharge lamp, which is free from premature clouding of its light-emitting tube to enhance its luminous flux utilization and undergoes only a little variation in color temperature depending on those of supply power for operation.
  • a lighting discharge lamp comprising a light-emitting tube in which a halogen and lutetium are sealed together with mercury and a rare gas.
  • the sealed amount of lutetium falls in a range of from 2 x 10 ⁇ 7 mol/cc to 2 x 10 ⁇ 5 mol/cc.
  • a lighting discharge lamp is fabricated by sealing a halogen and lutetium in a specific proportion together with mercury and a rare gas within a light-emitting tube 10 made of, for example, quartz glass as illustrated in FIG. 1.
  • an emission space-surrounding portion of the order of 2 cc is defined in the center of the light-emitting tube 10.
  • a pair of electrodes 21,22 are disposed in an opposing relation.
  • the electrode interval is at most 10 mm, for, example, about 7 mm. Discharge of an arc takes place between the pair of electrodes 21,22 during operation to emit light.
  • Numerals 31,32 indicate bases.
  • Mercury is an essential component for retaining the discharge of the arc and their sealed amounts are suitably selected.
  • exemplary rare gases employed in this invention may be mentioned xenon and argon.
  • lutetium iodide lutetium bromide and the like include.
  • the amount of lutetium sealed within the light-emitting tube falls in a range of from 2 x 10 ⁇ 7 mol/cc to 2 x 10 ⁇ 5 mol/cc. So long as the sealed amount of lutetium is inside the above range, as will be understood from the description of below-mentioned Experimental Examples, the premature clouding of the light-emitting tube is avoided effectively to enhance its luminous flux utilization and the variations of its color temperature depending on those of supply power for operation are reduced to a small extent.
  • an alkali metal such as lithium, sodium, potassium, rubidium or cesium may be addionally sealed within the light-emitting tube, for example, in order to stabilize arc discharge.
  • each light-emitting tube had an internal volume of 2 cc, the electrode interval was 7 mm and the rated power consumption of each lighting discharge lamp was 575 W.
  • the lutetium was sealed in the form of lutetium iodide (LuI3)
  • a lighting discharge lamp was fabricated by way of trial in the same manner as in Experimental Example 1 except that the sealed amount of lutetium was changed to 3 x 10 ⁇ 6 mol/cc.
  • the this-fabricated discharge lamp was lighted at its rated power consumption. As a result, its color temperature and luminous efficiency were found to be about 5500 K and 85 lm/W respectively.
  • the spectral distribution of the lighting discharge lamp in the present Experimental Example 2 is illustrated in FIG. 3. As is understood from the drawing, light emission caused by lutetium was continuously observed throughout the wavelength region of visible rays. It was hence confirmed that the lighting discharge lamp has a luminous distribution suitable for lighting discharge lamps.
  • a lighting discharge lamp was fabricated by way of trial in the same manner as in Experimental Example 1 except that the sealed amount of lutetium was changed to 3 x 10 ⁇ 6 mol/cc.
  • the thus-fabricated discharge lamp was lighted at its rated power consumption to investigate the variations of its color temperature as the operation time went on.
  • a curve A indicates a result of the present Experimental Example 3. I was confirmed therefrom that variations of its color temperature are scarcely observed even when 800 hours pass since the lamp has been lighted.
  • a lighting discharge lamp according to this invention was fabricated by way of trial in the same manner as in Experimental Example 3 to investigate the variations of its color temperature as supply power for operation was changed.
  • a curve B indicates results of the present Experimental Example 4. It was confirmed therefrom that variations of its color temperature are a little even when the supply power for operation was changed to a considerable extent.
  • a lighting discharge lamp according to this invention was fabricated by way of trial in the same manner as in Experimental Example 3 except that lutetium iodide (LuI3) was changed to lutetium bromide (LuBr3) to investigate the variations of its color temperature as supply power for operation was changed.
  • LuI3 lutetium iodide
  • LuBr3 lutetium bromide
  • a curve C indicates results of the present Experimental Example 5. It was confirmed therefrom that although this lamp is somewhat inferior to that (the curve B ) in Experimental Example 4 in which lutetium iodide (LuI3) was used, the variations of its color temperature are reduced to a sufficiently small extent so long as it is used at a power consumption of at least 400 W.
  • LuI3 lutetium iodide
  • Lighting discharge lamps were separately fabricated by way of trial in the same manner as in Experimental Example 3. The thus-fabricated lighting discharge lamps were subjected to a continuous lighting test to investigate whether their light-emitting tube became cloudy.
  • the clouding of its light-emitting tube considerably proceeded in 100-200 hours.
  • the clouding of its light-­emitting tube was not observed even when the operation was conducted for a long period of time beyond 200 hours. It was hence confirmed that the lighting discharge lamp according to this invention is sufficiently high in luminous flux utilization.
  • lighting discharge lamps were fabricated by sealing respectively DyI3, HoI3, CeI3, ErI3, GdI3, LuI3, SmI3, TbI3, NdI3 and PrI3 within their light-emitting tubes. These lamps were lighted at the rated power consumption to observe conditions of the clouding in their light-­emitting tubes upon elapsed time of 100 hours after the lighting. Results are shown in Table 1. Table 1 Rare earth halide Evaluation Rare earth halide Evaluation DyI3 B LuI3 C HoI3 A SmI3 A CeI3 B TbI3 B ErI3 A NdI3 A GdI3 A PrI3 B
  • LuI3 lutetium iodide

Landscapes

  • Discharge Lamp (AREA)
EP19890124095 1989-01-12 1989-12-28 Beleuchtungsentladungslampe Withdrawn EP0377899A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3670/89 1989-01-12
JP367089A JPH02186552A (ja) 1989-01-12 1989-01-12 照明用放電灯

Publications (2)

Publication Number Publication Date
EP0377899A2 true EP0377899A2 (de) 1990-07-18
EP0377899A3 EP0377899A3 (de) 1991-05-15

Family

ID=11563864

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890124095 Withdrawn EP0377899A3 (de) 1989-01-12 1989-12-28 Beleuchtungsentladungslampe

Country Status (2)

Country Link
EP (1) EP0377899A3 (de)
JP (1) JPH02186552A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001043163A1 (en) * 1999-12-09 2001-06-14 Koninklijke Philips Electronics N.V. Metal halide lamp

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006025947A1 (de) * 2006-06-02 2007-12-06 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Metallhalogenidfüllung für eine elektrische Hochdruckentladungslampe und zugehörige Lampe

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3842307A (en) * 1971-02-11 1974-10-15 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh High pressure mercury vapor discharge lamp with metal halide additives
GB2053562A (en) * 1979-06-29 1981-02-04 Narva Veb Discharge Lamp
EP0049545A1 (de) * 1980-10-02 1982-04-14 Koninklijke Philips Electronics N.V. Hochdruck-Quecksilberdampf-Entladungslampe
EP0389907A2 (de) * 1989-03-29 1990-10-03 Ushio Denki Kabushiki Kaisha Beleuchtungseinrichtung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3842307A (en) * 1971-02-11 1974-10-15 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh High pressure mercury vapor discharge lamp with metal halide additives
GB2053562A (en) * 1979-06-29 1981-02-04 Narva Veb Discharge Lamp
EP0049545A1 (de) * 1980-10-02 1982-04-14 Koninklijke Philips Electronics N.V. Hochdruck-Quecksilberdampf-Entladungslampe
EP0389907A2 (de) * 1989-03-29 1990-10-03 Ushio Denki Kabushiki Kaisha Beleuchtungseinrichtung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001043163A1 (en) * 1999-12-09 2001-06-14 Koninklijke Philips Electronics N.V. Metal halide lamp
US6597116B2 (en) 1999-12-09 2003-07-22 Koninklijke Philips Electronics N.V. Metal halide lamp
US6841938B2 (en) 1999-12-09 2005-01-11 Koninklijke Philips Electronics N.V. Metal halide lamp

Also Published As

Publication number Publication date
EP0377899A3 (de) 1991-05-15
JPH02186552A (ja) 1990-07-20

Similar Documents

Publication Publication Date Title
KR0129172B1 (ko) 고압 수은증기 방전 램프
US4171498A (en) High pressure electric discharge lamp containing metal halides
US6265827B1 (en) Mercury-free metal halide lamp
US5864210A (en) Electrodeless hid lamp and electrodeless hid lamp system using the same
JPH05205697A (ja) 高圧放電ランプ
JP2002504263A (ja) メタルハライドランプ
JPH0133900B2 (de)
EP1310984B1 (de) Quecksilberhochdruckentladungslampe, Beleuchtungs- und Bildprojektionssystem mit einer solchen Lampe
US5382873A (en) High-pressure discharge lamp with incandescing metal droplets
US4978884A (en) Metal halide discharge lamp having low color temperature and improved color rendition
US4866342A (en) Metal halide lamp with improved lumen output
JPH1186796A (ja) 高圧水銀放電ランプ
JPS60207241A (ja) 低圧水銀蒸気放電灯
EP0389907B1 (de) Beleuchtungseinrichtung
JPH11339727A (ja) メタルハライドランプ
EP0377899A2 (de) Beleuchtungsentladungslampe
US3324332A (en) Discharge tube having its electrodes recessed in wells
JP3314627B2 (ja) 高圧水銀放電ランプ
JP4488856B2 (ja) 水銀フリーメタルハライドランプ
JPS59167948A (ja) 高圧金属蒸気放電灯
JP2000294199A (ja) 高圧水銀ランプ、および高圧水銀ランプ発光装置
JPS59167949A (ja) 高圧金属蒸気放電灯
EP0276514A1 (de) Metallhalogenidlampe
JP3239721B2 (ja) メタルハライドランプ
EP0110249B1 (de) Hochdrucknatriumlampe mit verbesserter Farbenwiedergabe

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE GB NL

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE GB NL

17P Request for examination filed

Effective date: 19911111

17Q First examination report despatched

Effective date: 19931029

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19940309