EP0163301A2 - Disposition des électrodes dans des lampes métal-halogène - Google Patents

Disposition des électrodes dans des lampes métal-halogène Download PDF

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Publication number
EP0163301A2
EP0163301A2 EP85106620A EP85106620A EP0163301A2 EP 0163301 A2 EP0163301 A2 EP 0163301A2 EP 85106620 A EP85106620 A EP 85106620A EP 85106620 A EP85106620 A EP 85106620A EP 0163301 A2 EP0163301 A2 EP 0163301A2
Authority
EP
European Patent Office
Prior art keywords
metal halide
electrodes
discharge lamp
merit
arc tube
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Withdrawn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
EP85106620A
Other languages
German (de)
English (en)
Other versions
EP0163301A3 (fr
Inventor
William M. Keeffe
Zeya K. Krasko
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.)
Osram Sylvania Inc
Original Assignee
GTE Products 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 GTE Products Corp filed Critical GTE Products Corp
Publication of EP0163301A2 publication Critical patent/EP0163301A2/fr
Publication of EP0163301A3 publication Critical patent/EP0163301A3/fr
Withdrawn legal-status Critical Current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
    • H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
    • H01J61/827—Metal halide arc lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/073—Main electrodes for high-pressure discharge lamps
    • H01J61/0732—Main electrodes for high-pressure discharge lamps characterised by the construction of the electrode

Definitions

  • This invention relates to metal halide discharge lamps and more particularly to the positioning of electrodes in low power metal halide discharge lamps to enhance the efficiency of such lamps.
  • metal halide discharge lamps are, in general, of the intermediate and high wattage variety. More specifically, the known metal halide discharge lamps which are readily available have a rating in the range of about 175 to 1500 watts. Also, it is known that these metal halide discharge lamps having the higher wattages also have the higher efficacy. Moreover. efficacy is directly related to efficiency and is conveniently defined as the total lumen output to input power and is expressed in lumens per watt.
  • Such relatively small lamps appear to have an efficacy of about 80 LPW or lumens per watt, a lumen output of about 14.000 lumens and a color temperatures of about 4400 °K for a clear lamp and about 4000°K for a phosphor coated lamp.
  • An object of the present invention is to provide a metal halide discharge lamp which overcomes the problems of the prjor art. Another object of the invention is to provide an improved metal halide discharge lamp. Still another object of the invention is to provide an enhanced low wattage metal halide discharge lamp having improved efficacy. A further object of the invention is to provide an improved low wattage metal halide discharge lamp with an enhanced electrode configuration.
  • a low wattage metal halide discharge lamp having an evacuated outer envelope with a domed quartz sleeve positioned therein and an arc tube disposed within the domed quartz sleeve with the arc tube having a pair of spaced electrodes sealed therein with a coil on each electrode and each electrode having a figure of merit (FM) substantially equal to the product of the back space (BS) or distance from a press seal to the coil and an insertion length (IL) or distance from a press seal to the end of the electrode.
  • FM figure of merit
  • a low wattage metal halide arc discharge lamp 5 includes an evacuated outer envelope 7 hermetically sealed to a glass stem member 9 and having an external base member 11 affixed thereto.
  • a pair of electrical conductors 13 and 15 are sealed into and pass through the stem member 9 and provide access for energization of the discharge 5 by an external source (not shown).
  • a support member 17 is affixed to one of the electrical conductors 13 and extends substantially parallel to the longitudinal axis of the lamp 5 and forms a circular configuration 19 near the upper portion of the envelope 7. This circular configuration 19 in conjunction with the upper portion of the envelope 7 tend to maintain the support member 17 in proper alignment and resistant to deformation caused by external shock.
  • a first strap member 21 is welded to the support member 17 and extends therefrom in a direction normal to the longitudinal axis of the support member 17.
  • a heat conserving means such as a domed quartz sleeve 23 has a pair of oppositely disposed notches 25 and 27 on the end 28 thereof opposite to the domed portion. These notches 25 and 27 are formed to slip over the first strap member 21 which serves to support the domed quartz sleeve 23.
  • a substantially circular-shaped strap 29 surrounds the domed quartz sleeve 23 near the domed portion thereof and is attached to the support member 17.
  • the arc tube 31 has a pinch seal at opposite ends thereof, 33 and 3 5 respectively.
  • Metal foil members 37 and 39 are sealed into the press seals 33 and 35 and electrical conductors 41 and 43 are attached to the foil members 37 and 39 and extend outwardly from the press seals 33 and 35.
  • a flexible support member 45 is affixed to one of the electrical conductors 41 and to the support member 17.
  • a lead 47 is affixed to the other electrical conductor 43 which passes through the domed portion of the domed quartz sleeve 23.
  • a flexible spring-like member 49 connects the lead 47 to the other one 15 of the pair of electrical conductors 13 and 15.
  • a pair of getters 51 and 53 are affixed to the electrical conductors 13 and 15 and serve to provide and maintain the vacuum within the evacuated outer envelope 7 and the domed quartz sleeve 23. Moreover, a pair of electrodes 55 and 57 project into opposite ends of the arc tube 31.
  • each of the ends thereof immediately adjacent and including the press seals 33 and 35 is coated with a white zirconium oxide paint in order to provide a wall temperature ofincreased uniformity.
  • the arc tube 31 contains a starting gas. mercury and scandium and sodium metal halides. Moreover, other metal halides are also suitable to the structure.
  • an electrode 55 is attached tn a foil member 37 and this electrode 55 includes a coil 59 affixed thereto. Also, the coil 59 is positioned on the electrode 55 in a manner to provide a specific distance from the press seal 33 to the back of the coil 59 and this distance is designated the back space (BS). Also, the electrode 55 projects into the arc tube 31 for a given distance and this distance from the press seal 33 to the inner end of the electrode 55 is known as the insertion length (IL).
  • the back space (BS) and the insertion length (IL) are critical parameters and the product thereof provide a design criteria which may be referred to as a figure of merit (FM).
  • the figure of merit (FM) is substantially equal to the product of the back space (BS) and the insertion length (IL). Accordingly, the figure of merit ( F M) provides a discharge lamp design capability whereby specific design parameters are obtainable.
  • a back space (BS) or the distance of the back of a coil on an electrode to the press seal is preferably in the range of about 0.5 ⁇ 0.2 mm for lamps having a figure of merit (FM) greater than about 1.0 and less than 1.5.
  • lamps employing thoriated tungsten electrodes having a diameter of about 0.017 inch and a space therebetween of about 1.4 cm are preferable for low wattage lamp configurations.
  • a comparison is provided for a 100 watt metal halide discharge lamp with the above-described figure of merit (FM) compared with both lamp efficacy and a color temperature.
  • a 100 watt metal halide discharge lamp having a figure of merit (FM) greater than about 1.0 and less than about 1.5 would provide a lamp having an efficacy (LPW) in the range of about 98% to 93% and color temperature (T c ) in the range of about 2800°K to 3200°K.
  • LPF efficacy
  • T c color temperature
  • a 100 watt metal halide discharge lamp can be designed to have a color temperature most satisfactory for general illumination.
  • the design also provides an efficacy much improved over prior known low wattage structures.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamp (AREA)
EP85106620A 1984-05-29 1985-05-29 Disposition des électrodes dans des lampes métal-halogène Withdrawn EP0163301A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US61490384A 1984-05-29 1984-05-29
US614903 1984-05-29

Publications (2)

Publication Number Publication Date
EP0163301A2 true EP0163301A2 (fr) 1985-12-04
EP0163301A3 EP0163301A3 (fr) 1987-11-04

Family

ID=24463193

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85106620A Withdrawn EP0163301A3 (fr) 1984-05-29 1985-05-29 Disposition des électrodes dans des lampes métal-halogène

Country Status (3)

Country Link
EP (1) EP0163301A3 (fr)
JP (1) JPS6122552A (fr)
CA (1) CA1246132A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4963790A (en) * 1985-12-27 1990-10-16 Gte Products Corporation Low wattage metal halide discharge lamp

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2056760A (en) * 1979-08-01 1981-03-18 Gen Electric Discharge lamps

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2056760A (en) * 1979-08-01 1981-03-18 Gen Electric Discharge lamps

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JOURNAL OF THE ILLUMINATING ENGINEERING SOCIETY, vol. 11, no. 2, January 1982, pages 66-72, New York, US; W.H. LAKE et al.: "Low wattage metal halide lamps" *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4963790A (en) * 1985-12-27 1990-10-16 Gte Products Corporation Low wattage metal halide discharge lamp

Also Published As

Publication number Publication date
CA1246132A (fr) 1988-12-06
JPS6122552A (ja) 1986-01-31
EP0163301A3 (fr) 1987-11-04

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Effective date: 19850529

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18D Application deemed to be withdrawn

Effective date: 19900511

RIN1 Information on inventor provided before grant (corrected)

Inventor name: KEEFFE, WILLIAM M.

Inventor name: KRASKO, ZEYA K.