EP0444590A1 - Metalldampfentladungslampe - Google Patents

Metalldampfentladungslampe Download PDF

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Publication number
EP0444590A1
EP0444590A1 EP91102794A EP91102794A EP0444590A1 EP 0444590 A1 EP0444590 A1 EP 0444590A1 EP 91102794 A EP91102794 A EP 91102794A EP 91102794 A EP91102794 A EP 91102794A EP 0444590 A1 EP0444590 A1 EP 0444590A1
Authority
EP
European Patent Office
Prior art keywords
metal vapor
vapor discharge
discharge lamp
iron
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.)
Granted
Application number
EP91102794A
Other languages
English (en)
French (fr)
Other versions
EP0444590B1 (de
Inventor
Masachika Ohyama
Tetsuo Fuse
Akiyasu Yamaguchi
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=12690871&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0444590(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Ushio Denki KK filed Critical Ushio Denki KK
Publication of EP0444590A1 publication Critical patent/EP0444590A1/de
Application granted granted Critical
Publication of EP0444590B1 publication Critical patent/EP0444590B1/de
Anticipated expiration legal-status Critical
Revoked 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
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/18—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent

Definitions

  • This invention relates to a metal vapor discharge lamp to be employed for photochemical reactions or curing of paints and inks.
  • Ultraviolet rays are often used for inducing photochemical reactions or curing paints and inks, and those having a wavelength in the range of about 280 to 400 nm are useful for such purposes.
  • Metal vapor discharge lamps are often used as sources of such ultraviolet rays.
  • Such metal vapor discharge lamp has a pair of electrodes disposed at each end of a tubular bulb to oppose each other, and the tubular bulb contains a metal halide together with sufficient amounts of mercury and a rare gas so as to maintain arc discharge to occur, whereby to increase the quantity of light emission in the effective wavelength range.
  • metal vapor discharge lamps having incorporated therein iron in the form of metal halide is conveniently used for the purpose of curing paints and inks, since they can continuously emit ultraviolet rays in the wavelength range of 350 to 400 nm.
  • the iron-filled metal vapor discharge lamp can emit a large quantity of ultraviolet rays, ultraviolet rays can penetrate the internal portion of the paint or ink layer quickly, to allow curing of the material to be cured in a short time.
  • metal vapor discharge lamp is occasionally used at a power demand which is lower than the rated power depending on the application. Once the metal vapor discharge lamp is turned off, it requires several minutes until it can be lit again. Accordingly, when ultraviolet rays are irradiated onto materials to be irradiated flowing intermittently, on/off operation of the metal vapor discharge lamp cannot be repeated in short cycles, so that a contrivance is used to shield the lamp with a shutter when irradiation should be screened. Thus, while the shutter is closed, the metal vapor discharge lamp is lit on with the power demand of the metal vapor discharge lamp being dropped to about, for example, 1/2 the rated power.
  • the arc 4 to be generated between the electrodes 2,3 disposed to oppose each other at both internal ends of the tubular bulb 1 displaces in the vicinity of the electrodes 2,3 as indicated with X.
  • Such arc displacement phenomenon occur either or both of the electrodes 2,3, and the degree and state thereof vary widely.
  • the quartz glass is opacified to have reduced life.
  • the position of the arc in the metal vapor discharge lamp is allowed to coincide with the focal point of the reflector.
  • the light at the displaced portion X deviates from the focal point and cannot be utilized, to afford low light utilization efficiency.
  • thallium is effective for achieving the above objects, and after they made various experiments they accomplished this invention.
  • displacement in the arc can be prevented by incorporating thallium in an amount of 3.2 x 10 ⁇ 9 to 2.0 x 10 ⁇ 7 mol per cc of the content volume of the bulb even when the metal vapor discharge lamp is lit at a power demand which is considerably lower than the rated power. Therefore, the bulb is prevented from being opacified by overheating and can enjoy long life.
  • the metal vapor discharge lamp is used in combination with a converging reflector, the arc can entirely be allowed to coincide with the focal point of the reflector, so that no reduction in the light utilization efficiency will occur.
  • the amount of thallium is less than 3.2 x 10 ⁇ 9 mol per cc of the content volume of the bulb, the effect of preventing displacement in the arc may not sufficiently be exhibited; whereas if it is more than 2.0 x 10 ⁇ 7 mol per cc, outputs of the luminescence spectrum of mercury, iron and magnesium will be lowered, whereby intensity of the ultraviolet rays in the effective wavelength range of 280 to 400 nm will consequently be lowered, disadvantageously.
  • Fig. 1 is an illustration of a metal vapor discharge lamp.
  • the metal vapor discharge lamp according to this invention has a basic structure as shown in Fig. 1; wherein a pair of electrodes 2,3 are disposed in a tubular bulb 1 made of a quartz tube having an inner diameter of 22 mm at each end to oppose each other with a distance of 750 mm therebetween.
  • This metal vapor discharge lamp is operated at a rated power demand of 9 KW and has a content volume of 285 cc.
  • the bulb 1 contains 285 mg of a metal mercury (Hg), 30 mg of mercury iodide (Hg2I2), 5.0 mg of iron (Fe), 0.7 mg of magnesium, 1.9 mg of thallium iodide and 30 mmHg of xenon gas.
  • the amount of thallium to be incorporated is 2.0 x 10 ⁇ 8 mol per cc of the content volume of the bulb 1.
  • the arc can entirely be allowed to coincide with the focal point of the reflector, so that no reduction in the light utilization efficiency occurred.
  • the mark X in the column of Arc displacement means that arc displacement occurred at both end portions of the lamp in 18 lamps out of 20, and at either end portion of the lamp in the remaining 2 lamps; and the mark ⁇ means that no arc displacement occurred in any of 20 lamps.
  • the numerical values in the column of the Ultraviolet output are relative values in the wavelength range of 280 to 400 nm.
  • thallium halide While a thallium halide was used in this embodiment, it may be replaced by a metal thallium. The same effect can be obtained by using a mixture of such materials.

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  • Discharge Lamp (AREA)
EP19910102794 1990-02-27 1991-02-26 Metalldampfentladungslampe Revoked EP0444590B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP44415/90 1990-02-27
JP2044415A JP2732455B2 (ja) 1990-02-27 1990-02-27 金属蒸気放電灯

Publications (2)

Publication Number Publication Date
EP0444590A1 true EP0444590A1 (de) 1991-09-04
EP0444590B1 EP0444590B1 (de) 1994-11-02

Family

ID=12690871

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910102794 Revoked EP0444590B1 (de) 1990-02-27 1991-02-26 Metalldampfentladungslampe

Country Status (3)

Country Link
EP (1) EP0444590B1 (de)
JP (1) JP2732455B2 (de)
DE (1) DE69104866T2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101587816B (zh) * 2008-05-21 2014-09-03 哈利盛东芝照明公司 金属卤化物灯

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5069493B2 (ja) * 2006-11-02 2012-11-07 ハリソン東芝ライティング株式会社 紫外線放電ランプ
JP2009076396A (ja) * 2007-09-21 2009-04-09 Harison Toshiba Lighting Corp メタルハライドランプ
WO2010084771A1 (ja) * 2009-01-26 2010-07-29 ハリソン東芝ライティング株式会社 メタルハライドランプ
JP2011204434A (ja) * 2010-03-25 2011-10-13 Harison Toshiba Lighting Corp メタルハライドランプ、紫外線照射装置
JP5573791B2 (ja) * 2011-07-21 2014-08-20 株式会社Ｇｓユアサ メタルハライドランプ

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4074164A (en) * 1976-04-15 1978-02-14 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Sun lamp
US4745335A (en) * 1985-10-04 1988-05-17 Ushio Denki Kabushiki Kaisha Magnesium vapor discharge lamp

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4074164A (en) * 1976-04-15 1978-02-14 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Sun lamp
US4745335A (en) * 1985-10-04 1988-05-17 Ushio Denki Kabushiki Kaisha Magnesium vapor discharge lamp

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101587816B (zh) * 2008-05-21 2014-09-03 哈利盛东芝照明公司 金属卤化物灯

Also Published As

Publication number Publication date
JPH03250550A (ja) 1991-11-08
DE69104866D1 (de) 1994-12-08
EP0444590B1 (de) 1994-11-02
DE69104866T2 (de) 1995-03-30
JP2732455B2 (ja) 1998-03-30

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