EP0444590B1 - Metalldampfentladungslampe - Google Patents

Metalldampfentladungslampe Download PDF

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Publication number
EP0444590B1
EP0444590B1 EP19910102794 EP91102794A EP0444590B1 EP 0444590 B1 EP0444590 B1 EP 0444590B1 EP 19910102794 EP19910102794 EP 19910102794 EP 91102794 A EP91102794 A EP 91102794A EP 0444590 B1 EP0444590 B1 EP 0444590B1
Authority
EP
European Patent Office
Prior art keywords
metal vapor
discharge lamp
vapor discharge
thallium
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.)
Revoked
Application number
EP19910102794
Other languages
English (en)
French (fr)
Other versions
EP0444590A1 (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
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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(B1) "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.
  • a 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 an arc discharge, in order to to increase the quantity of light emission in the effective wavelength range.
  • metal vapor discharge lamps having incorporated therein iron in the form of a metal halide are 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, the ultraviolet rays can penetrate the internal portion of the paint or ink layer quickly, to allow curing of the material in a short time.
  • Such a metal vapor discharge lamp is occasionally used at a lower power demand 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 materials are irradiated with ultraviolet rays intermittently, on/off operation of the metal vapor discharge lamp cannot be repeated in short cycles, so that the lamp must be shielded with a shutter when the radiation should be screened. Thus, while the shutter is closed, the metal vapor discharge lamp is lit on at a power of, for example, 1/2 the rated power. Therefore, in the case of a magnesium-filled metal vapor discharge lamp and when it is lit at a power which is lower than the rated power, the following problems arise. As shown in Fig.
  • 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 an arc displacement phenomenon occurs at either or both of the electrodes 2,3, and the degree and state thereof vary widely.
  • the portion of the bulb immediately above the displaced portion X is overheated by the arc approaching thereto. Accordingly, the quartz glass becomes opaque and has a reduced life.
  • the position of the arc in the metal vapor discharge lamp coincides with the focal point of the reflector.
  • the light at the displaced portion X deviates from the focal point and cannot be utilized, a low light utilization efficiency resulting.
  • thallium is effective for achieving the above objects, and after they made various experiments they accomplished this invention.
  • displacement of 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 which is considerably lower than the rated power. Therefore, the bulb is prevented from becoming opaque by overheating and can enjoy a long life.
  • the metal vapor discharge lamp is used in combination with a converging reflector, the arc coincides 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 of the arc may not sufficiently be exhibited; whereas if it is more than 2.0 x 10 ⁇ 7 mol per cc, the output of the luminescence spectrum of mercury, iron and magnesium will be lowered, whereby the 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 quartz 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 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 4000 Pa (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 lamp current was 10.3 A with no displacement of the arc 4.
  • the mark X in the column of Arc displacement means that an 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.
  • the iron will not be deposited on the internal surface of the bulb 1 even after extended lighting to form a thin iron film, so that the output of the ultraviolet rays can be maintained.
  • the effect of the thallium additionally incorporated to the metal vapor discharge lamp on the spectrum output of mercury and those of iron and magnesium was investigated. It was found that in the metal vapor discharge lamp of this embodiment, the loss in the spectrum output of mercury was 4 %, that of iron was 4 %, and that of magnesium was 1 %, which are insignificant values compared with the metal vapor discharge lamp containing no thallium.
  • the above data proves that if thallium is added in an amount of 2.0 x 10 ⁇ 8 mol/cc of the content volume of the bulb 1, the spectrum outputs of mercury, iron and magnesium will not be affected by the thallium. Further, the addition of thallium has no substantial effect on the electrical characteristics such as starting current and reignition voltage.

Landscapes

  • Discharge Lamp (AREA)

Claims (1)

  1. Metalldampf-Entladungslampe mit einer Glühlampe und einem Paar darin angeordneter Elektroden, welche geeignete Mengen von Eisen, Halogen und Magnesium zusammen mit genügenden Mengen von Quecksilber und einem Edelgas enthält, so daß eine Bogenentladung aufrechterhalten wird, dadurch gekennzeichnet, daß weiterhin Thallium in einer Menge von 3,2 x 10⁻⁹ bis 2,0 x 10⁻⁷ mol pro cm³ des Volumengehalts der Glühlampe eingearbeitet worden ist.
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 EP0444590A1 (de) 1991-09-04
EP0444590B1 true 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)

Families Citing this family (6)

* 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
JP5217021B2 (ja) * 2008-05-21 2013-06-19 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
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

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2616893A1 (de) * 1976-04-15 1977-11-03 Patra Patent Treuhand Bestrahlungslampe
GB2182486B (en) * 1985-10-04 1990-06-06 Ushio Electric Inc Magnesium and iron vapor discharge lamp

Also Published As

Publication number Publication date
JP2732455B2 (ja) 1998-03-30
DE69104866T2 (de) 1995-03-30
DE69104866D1 (de) 1994-12-08
JPH03250550A (ja) 1991-11-08
EP0444590A1 (de) 1991-09-04

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