EP0124368B1 - Elektrische Entladungslampe mit thermischem Schalter - Google Patents

Elektrische Entladungslampe mit thermischem Schalter Download PDF

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Publication number
EP0124368B1
EP0124368B1 EP19840302857 EP84302857A EP0124368B1 EP 0124368 B1 EP0124368 B1 EP 0124368B1 EP 19840302857 EP19840302857 EP 19840302857 EP 84302857 A EP84302857 A EP 84302857A EP 0124368 B1 EP0124368 B1 EP 0124368B1
Authority
EP
European Patent Office
Prior art keywords
bimetal strip
spring
switch
electrically conductive
support member
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.)
Expired
Application number
EP19840302857
Other languages
English (en)
French (fr)
Other versions
EP0124368A1 (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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    • 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.
  • the construction still has inherent disadvantages, in particular that the temperature of actuation of the switch can only be selected within a limited range for a switch of given dimensions, and that upon excessive heating of the switch above its closing temperature, the restraint upon the bimetal strip is still greater than might be desired.
  • 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.
  • 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.
  • 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 Fig. 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 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 (N/O) switch at room temperature. Moreover, 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.

Landscapes

  • Thermally Actuated Switches (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)

Claims (4)

1. Thermischer Arbeitsschalter zur Verwendung bei Temperaturausschlägen oberhalb seiner üblichen Schließtemperaturen mit einem Stützelement (53) aus Siliziumoxid; einem Paar in Abstand voneinander angeordneter, in dem Stützelement aus Siliziumoxid eingebetteter, elektrisch leitender Elemente (49, 51); einem Bimetallstreifen (57) und einem federähnlichen Element (61), wobei der Bimetallstreifen an einem Element des Paares elektrisch leitender Elemente (49) befestigt ist und der Bimetallstreifen und das federähnliche Element derart angeordnet sind, daß das Paar elektrisch leitender Elemente (49, 51) bei Erwärmung des Bimetallstreifens auf eine Schalterschließtemperatur kurzgeschlossen und das federähnliche Element (61) durch eine Aufheizung des Bimetallstreifens auf eine Temperatur, die größer ist als die Schalterschließtemperatur, defomiert werden, dadurch gekennzeichnet, daß der Bimetallstreifen (57) ein einen elektrischen Kontakt bildendes freies Ende (59) besitzt, daß das federähnliche Element (61) als eine Fortsetzung des anderen elektrisch leitenden Elements (51) ausgebildet ist, welches eine Drahtfeder ist, die einen im wesentlichen U-förmigen Teil aufweist, der in das Stützelement aus Siliziumoxid eingebettet ist, daß ein Ellbogenteil sich vom Stützelement aus Siliziumkarbid und wiederum ein linearer Teil sich von dem Ellbogen weg erstrecken, und daß der lineare Teil des federähnlichen Elements (61) und der Bimetallstreifen (57) sich von den jeweiligen elektrisch leitenden Elementen (51, 49) weg und im wesentlichen parallel zueinander erstrecken, wobei das Schließen des Schalters durch Berührung zwischen den freien Enden des Bimetallstreifens (57) und dem linearen Teil des federähnlichen Elements (61) bewirkt wird, und wiederum die Deformation des federähnlichen Elements durch Verlagerung des freien Endes des linearen Teils des federähnlichen Elements bewirkt wird.
2. Schalter nach Anspruch 1, dadurch gekennzeichnet, daß das freie Ende des Bimetallstreifens (57) eine Kerbe (59) aufweist, die dazu ausgebildet ist, das freie Ende des federähnlichen Elements (61) aufzunehmen und festzulegen.
3. Schalter nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß ein Teil des Bimetallstreifens (57) mittels Elementen am Stützelement (53) aus Siliziumoxid anmontiert ist, die in diesem Stützelement (53) aus Siliziumoxid an Stellen eingebettet sind, die voneinander in Abstand angeordnet sind, so daß der genannte Teil des Bimetallstreifens (57) gegen ein Verdrehen relativ zum Stützelement aus Siliziumoxid gehalten ist.
4. Schalter nach irgendeinem der Ansprüche 1 bis 3, in Kombination mit einer elektrischen Entladungslampe, bestehend aus einer mit Gas gefüllten äußeren Glashülle (7) mit einem Paar elektrisch leitender Zuführungen (13, 15), die in ihr eingesiegelt sind und durch sie hindurch führen, und einer Bogenentladungsröhre (1) innerhalb der äußeren Glashülle mit jeweils einer Elektrode (21, 23), die in einander gegenüberliegenden Enden derselben eingesiegelt sind, und einer Startelektrode (25), die einer dieser Elektroden (21) benachbart ist, wobei die Bogenentladungsröhre (19) eine ionisierbare Füllung besitzt und unter elektrischer Belastung bei hohen Temperaturen der Elektrolyse unterworfen ist, und wobei das Stützelement aus Siliziumoxid unabhängig von der Bogenentladungsröhre (19) ausgebildet ist, und wobei schließlich der Schalter entfernt von der Bogenentladungsröhre (19) montiert ist, wobei schließlich ein Element des Paars elektrisch leitender Elemente (51) mit einer Elektrode (21) und das andere Element (49) mit der Startelektorde (25) verbunden ist.
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 EP0124368A1 (de) 1984-11-07
EP0124368B1 true 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)

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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4659965A (en) * 1983-11-16 1987-04-21 Gte Products Corporation High pressure discharge lamp with thermal switch
US5004949A (en) * 1988-05-31 1991-04-02 North American Philips Corporation Fluorescent lamp with grounded electrode guard

Family Cites Families (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
US4355261A (en) * 1980-12-15 1982-10-19 Gte Products Corporation Discharge lamp with integral starter
US4360758A (en) * 1981-01-23 1982-11-23 Westinghouse Electric Corp. High-intensity-discharge lamp of the mercury-metal halide type which efficiently illuminates objects with excellent color appearance
US4445073A (en) * 1982-03-22 1984-04-24 Gte Products Corporation Intimate contact starting aid for arc lamps

Also Published As

Publication number Publication date
CA1232317A (en) 1988-02-02
EP0124368A1 (de) 1984-11-07
DE3480821D1 (de) 1990-01-25

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