EP0124368A1 - Elektrische Entladungslampe mit thermischem Schalter - Google Patents

Elektrische Entladungslampe mit thermischem Schalter Download PDF

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Publication number
EP0124368A1
EP0124368A1 EP19840302857 EP84302857A EP0124368A1 EP 0124368 A1 EP0124368 A1 EP 0124368A1 EP 19840302857 EP19840302857 EP 19840302857 EP 84302857 A EP84302857 A EP 84302857A EP 0124368 A1 EP0124368 A1 EP 0124368A1
Authority
EP
European Patent Office
Prior art keywords
pair
conductive members
spring
affixed
electrically conductive
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
EP19840302857
Other languages
English (en)
French (fr)
Other versions
EP0124368B1 (de
Inventor
Robert J. Karlotski
Martin E. Muzeroll
Joseph S. Kulik
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 EP0124368A1 publication Critical patent/EP0124368A1/de
Application granted granted Critical
Publication of EP0124368B1 publication Critical patent/EP0124368B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/02—Details
    • H05B41/04—Starting switches
    • H05B41/06—Starting switches thermal only
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/56—One or more circuit elements structurally associated with the lamp

Definitions

  • This invention relates to electric discharge lamps and more particularly to electric discharge lamps having a normally open thermal switch therein and to normally open thermal switches having switch distortion inhibiting capabilities.
  • Electric discharge lamps such as metal halide lamps which include mercury, the metals of various halides and particularly sodium iodide undesirably are subject to electrolysis between the usual starter electrodes and the electrode immediately adjacent thereto. Moreover, any DC potential existing between the above-mentioned electrodes undesirably increases electrolytic activity and especially so as operational temperatures increase.
  • the metal halide lamps include a sealed glass envelope with a fused silica arc tube disposed within the sealed glass envelope.
  • the outer glass envelope was evacuated whereupon a thermal switch was subjected to a temperature which was determined by lamp wattage and substantially independent of lamp orientation or position of operation.
  • a simple thermal switch could be incorporated into the outer glass envelope and accommodate temperature variations encountered while employing commercially available bimetal materials.
  • An object of the present invention is to provide an improved electric discharge lamp. Another object of the invention is to enhance the response capability to increased temperature variations in an electric discharge lamp. Still another object of the invention is to provide an improved thermal switch applicable for use in an electric discharge lamp. A further object of the invention is to provide a thermal switch of enhanced capability to respond to variations in operational temperatures.
  • an electric discharge lamp having an arc tube with an electrode and an adjacent starting electrode sealed therein with the arc tube disposed within a gas filled envelope and a thermal switch external to the arc tube and internal to the envelope.
  • the switch has a pair of electrical conductive members affixed to a silica support member and a bimetal strip and a spring-like member are affixed to one of said pair of conductive members and operative to short-circuit the pair of conductive members.
  • a thermal switch has a pair of electrical conductors attached to a silica support member and a bimetal strip and spring-like member are affixed to at least one of the electrical conductors in a manner to short-circuit the pair of electrical conductors upon application of heat thereto in an amount sufficient to reach the closure temperature of the switch.
  • the spring-like member flexes to prevent permanent deformation of the bimetal upon application of an increased temperature.
  • a metal halide lamp 5 includes an outer glass envelope 7 having a bulged substantially tubular configuration with a neck portion 9 closed by a stem member 11 hermetically sealed thereto.
  • a pair of electrically conductive leads 13 and 15 are sealed into and pass through the stem member 11 and are electrically connected to the contacts of a screw-in base member 17.
  • a fused silica arc tube 19 Disposed within the outer glass envelope 7 is a fused silica arc tube 19.
  • the arc tube 19 has electrodes 21 and 23 sealed into opposite ends thereof and a starting electrode 25 is sealed into one end of the arc tube 19 and positioned adjacent one of the electrodes 21.
  • the electrodes 21 and 23 and the starting electrode 25 each have an electrical conductive member, 27, 29 and 31 respectively, electrically connected thereto and passing through the sealed arc tube 19.
  • a first cage-like mounting member 33 is affixed to one end of the arc tube 19 and includes a pair of spring-clips 35 and 37 thereon which contact the outer glass envelope 7 and serve to support the arc tube 19 therein.
  • the electrical conductive member 29 connected to the electrode 23 is also connected by a curved wire 39 to one of the electrically conductive leads 13 sealed into the stem member 11 affixed to the outer glass envelope 7.
  • a second cage-like mounting member 40 is affixed to the opposite end of the arc tube 19 and also includes a pair of spring-clips 41 and 43 thereon which contact the outer glass envelope 7 and serve to more rigidly support the arc tube 19 therein.
  • the second cage-like mounting member 40 is affixed to the other electrically conductive lead 15 sealed into and passing through the stem member 11 affixed to the outer glass envelope 7.
  • the electrical conductive member 27 connected to the electrode 21 is also connected to the other electrically conductive lead 15 by way of the second cage-like mounting member 40.
  • the starting electrode 25 is connected by way of an electrical conductive member 31 to a resistor 45 which is, in turn, connected to the electrically conductive lead 13 sealed into the stem member 11.
  • a thermal switching means 47 is spaced from the arc tube 19 and affixed to the second cage-like mounting member 40.
  • the thermal switching means 47 is of a configuration such that location thereof at a relatively cool or lower temperature within the outer glass envelope 7 is attainable without other deleterious effect. In other words, increases in lamp temperature by as much as a hundred degrees due to the use of wide beam fixtures wherein the lamp is moved further into the fixture and universal burning positions of the lamp have necessitated movement of the thermal switching means 47 from the usual location on the electrical conductive members 27 and 31 to a location more remote from:the arc tube 19. Thus, remotely locating the thermal switching means 47 tends to reduce overstressing of the bimetallic material of the switching means 47 beyond the elastic limit thereof negating any permanent deformation of the switching means 47 or malfunctioning of the lamp 5 due to such deformation.
  • FIG. 2 illustrates a preferred embodiment thereof which includes a pair of electrical conductors 49 and 51 embedded in a silica support member 53.
  • the one electrical conductor 49 includes an outwardly extending portion 55 which is formed to provide for attachment of the support member 53 to an adjacent structure at a desired location relatively remote from the arc tube, 19 of F IG. 1, such as the second cage-like mounting member, 40 of FIG. 1.
  • a bimetal strip 57 preferably extending in a direction normal to the plane of the support member 53.
  • the bimetal strip 47 preferably has a notched end portion 59 which will be explained hereinafter.
  • the second one 51 of the pair of electrical conductors 49 and 51 is preferably formed to provide a spring-like member 61 extending substantially parallel to and spaced from the bimetal strip 57.
  • the bimetal strip 57 as well as the spring-like member 61 are individually adjustable whereby compensation for variations in temperature due to differing locations of the thermal switching means 47 is readily effected.
  • the arc tube 19 of a metal halide lamp normally has a fill which includes mercury and halides of various metals including sodium.
  • the outer glass envelope 7 includes a fill of an inactive gas, such as nitrogen for example.
  • the thermal switching means 47 is in the form of a normally-open (M/0) switch at room temperature.
  • the closure temperature of the thermal switching means 47 is dependent upon numerous factors, such as the placement of the switching means 47 within the envelope 7, the gas fill and the design of the switching means 47. Common thermostats practical for lamp use have been found to be satisfactory to the present application.
  • the thermal switching means 47 may be of a form, illustrated in FIG. 3, having a glass bridge member 63 with a pair of electrical conductors 65 and 67 affixed thereto.
  • One electrical conductor 65 is formed with an outwardly extending portion 69 whereby attachment of the switching means 47 may be effected.
  • the one electrical conductor 65 has an upstanding portion 71 adjacent the other one 67 of the pair of electrical conductors 65 and 67.
  • the other electrical conductor 67 has a bimetal strip 73 affixed thereto with a flexible spring-like member 75 attached to the bimetal stip 73 at the end thereof 77 most distant from the bridge member 63.
  • the other electrical conductor 67 is formed for connection to an electrode.
  • the spring-like member 75 permits flexing of the bimetal strip 73 without permanent deformation of the bimetal strip 73 even though subjected to excessive temperature excursions.

Landscapes

  • Discharge Lamps And Accessories Thereof (AREA)
  • Thermally Actuated Switches (AREA)
EP19840302857 1983-04-28 1984-04-27 Elektrische Entladungslampe mit thermischem Schalter Expired EP0124368B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US48962383A 1983-04-28 1983-04-28
US489623 1983-04-28

Publications (2)

Publication Number Publication Date
EP0124368A1 true EP0124368A1 (de) 1984-11-07
EP0124368B1 EP0124368B1 (de) 1989-12-20

Family

ID=23944598

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840302857 Expired EP0124368B1 (de) 1983-04-28 1984-04-27 Elektrische Entladungslampe mit thermischem Schalter

Country Status (3)

Country Link
EP (1) EP0124368B1 (de)
CA (1) CA1232317A (de)
DE (1) DE3480821D1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU575599B2 (en) * 1983-11-16 1988-08-04 Gte Products Corporation Discharge lamp
EP0434162A2 (de) * 1989-12-22 1991-06-26 Koninklijke Philips Electronics N.V. Niederdruckquecksilberdampfentladungslampe

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3619710A (en) * 1969-10-29 1971-11-09 Sylvania Electric Prod High-pressure electric discharge lamp having electrolysis-preventing means
US3965387A (en) * 1974-06-24 1976-06-22 General Electric Company Electric lamp and thermal switch therefore
EP0054272A2 (de) * 1980-12-15 1982-06-23 GTE Products Corporation Entladungslampe mit eingebauter Zündung
EP0057093A1 (de) * 1981-01-23 1982-08-04 North American Philips Lighting Corporation Entladungslampen hoher Intensität
EP0089582A2 (de) * 1982-03-22 1983-09-28 GTE Products Corporation Eng anliegende Zündhilfe für Bogenlampen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3619710A (en) * 1969-10-29 1971-11-09 Sylvania Electric Prod High-pressure electric discharge lamp having electrolysis-preventing means
US3965387A (en) * 1974-06-24 1976-06-22 General Electric Company Electric lamp and thermal switch therefore
EP0054272A2 (de) * 1980-12-15 1982-06-23 GTE Products Corporation Entladungslampe mit eingebauter Zündung
EP0057093A1 (de) * 1981-01-23 1982-08-04 North American Philips Lighting Corporation Entladungslampen hoher Intensität
EP0089582A2 (de) * 1982-03-22 1983-09-28 GTE Products Corporation Eng anliegende Zündhilfe für Bogenlampen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU575599B2 (en) * 1983-11-16 1988-08-04 Gte Products Corporation Discharge lamp
EP0434162A2 (de) * 1989-12-22 1991-06-26 Koninklijke Philips Electronics N.V. Niederdruckquecksilberdampfentladungslampe
EP0434162A3 (en) * 1989-12-22 1991-10-30 N.V. Philips' Gloeilampenfabrieken Low-pressure mercury vapour discharge lamp

Also Published As

Publication number Publication date
EP0124368B1 (de) 1989-12-20
CA1232317A (en) 1988-02-02
DE3480821D1 (de) 1990-01-25

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