US3484639A - Electrode for an electrical discharge device - Google Patents

Electrode for an electrical discharge device Download PDF

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Publication number
US3484639A
US3484639A US621238A US3484639DA US3484639A US 3484639 A US3484639 A US 3484639A US 621238 A US621238 A US 621238A US 3484639D A US3484639D A US 3484639DA US 3484639 A US3484639 A US 3484639A
Authority
US
United States
Prior art keywords
electrode
lamp
electrical discharge
discharge device
wall
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 - Lifetime
Application number
US621238A
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English (en)
Inventor
Johannes Adrianus Corne Jansen
Tjepke Hendrik Ekkelboom
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.)
US Philips Corp
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US Philips 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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3484639A publication Critical patent/US3484639A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors

Definitions

  • the invention relates to an electrode which is hermetically sealed in the wall of an electrical discharge device, e.g., a high-pressure lamp.
  • thoriated tungsten i.e., tungsten containing a few percent of thorium.
  • thoriated tungsten i.e., tungsten containing a few percent of thorium.
  • thoriated tungsten is sealed into a lamp wall of high-meltingpoint glass, for example, quartz glass, thorium reaches the surface due to the required high sealing temperature,
  • the electrode is made of two parts, the part passing through the lamp Wall consisting of pure tungsten.
  • soldering material used for this purpose consists of a metal, for example, platinum, the melting temperature of which is approximately equal to or lower than the softening temperature of the glass, during operation of the lamp at temperatures which may lie just below the softening point of the glass, this metal may arrive in the discharge space due to evaporation, which is undesirable.
  • molybdenum melting temperature 2600 C.
  • molybdenum alloys other metals of very high melting point such as tantalum, niobium, etc., proved to be unsuitable for use as Soldering material, since they absorb hydrogen (developed from the glass or during the process of exhausting the lamp), which results in a brittle structure of the soldering area detrimental to the mechanical strength of the electrode.
  • an electrode for a high-pressure gas and/or vapor discharge lamp consists of two electrically series-connected parts.
  • the part which passes through the Wall of the lamp consists of thoriated tungsten, while the two parts of the electrode are joined to each other solely by means of an intermediate layer of molybdenum or of a molybdenum alloy the melting point of which lies considerably higher than the softening temperature of the high-melting-point glass.
  • a rod-shaped electrode of a short are Xenon discharge lamp of 2 to 3 kw. (at a lamp current of 100 to 150 a.) faces the discharge, has a conical free end and consists of thoriated tungsten; in operation, the
  • the electrode part 1 is joined through a molybdenum layer 2 to a similar rod-shaped part 3 of pure tungsten which in the case shown has the same diameter of approximately 4.5 mms. as the part 1 and is in line With the latter.
  • the joint between the two parts 1 and 3 is established in that the two parts with an interposed molybdenum plate are heated at high temperature, for example, by means of a flame or high-frequency energy.
  • Part 3 is joined in a vacuum-tight manner through intermediate glass parts 4, 5 and 6 to the lower portion 7 of the quartz glass bulb 8.
  • the soldering area 2 is located in a narrowed cylindrical portion 9 of the lamp so that the soldering area 2 of the electrode 1-3 is protected from excessively high bending loads resulting, for example, from shocks during the transport of the lamps.
  • the soldering area 2 is preferably located at a distance from the conical end of the electrode part 1 such that the discharge cannot terminate at this area.
  • the distance between the conical end and the soldering area is approximately 40 mms., while this soldering area is located at a distance of approximately 15 mms., from the upper end of the cylindrical portion 9.
  • a rodshaped electrode which is passed in a gas-tight manner through the wall of the lamp consisting of a high-meltingpoint glass, said electrode consisting of two electrically series-connected parts, one part, passing through the wall of the lamp, consisting of pure tungsten and the other part, joined thereto and located inside the lamp, consisting of thoriated tungsten, the two parts of the electrode being joined together solely by means of an intermediate metal disc containing molybdenum, the melting point of said metal disc being substantially higher than the softening temperature of the glass.

Landscapes

  • Discharge Lamp (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US621238A 1966-03-16 1967-03-07 Electrode for an electrical discharge device Expired - Lifetime US3484639A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6603392A NL6603392A (enrdf_load_stackoverflow) 1966-03-16 1966-03-16

Publications (1)

Publication Number Publication Date
US3484639A true US3484639A (en) 1969-12-16

Family

ID=19795988

Family Applications (1)

Application Number Title Priority Date Filing Date
US621238A Expired - Lifetime US3484639A (en) 1966-03-16 1967-03-07 Electrode for an electrical discharge device

Country Status (8)

Country Link
US (1) US3484639A (enrdf_load_stackoverflow)
AT (1) AT272458B (enrdf_load_stackoverflow)
BE (1) BE695554A (enrdf_load_stackoverflow)
CH (1) CH469349A (enrdf_load_stackoverflow)
DE (1) DE1589241C3 (enrdf_load_stackoverflow)
FR (1) FR1519041A (enrdf_load_stackoverflow)
GB (1) GB1166401A (enrdf_load_stackoverflow)
NL (1) NL6603392A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4820906A (en) * 1987-03-13 1989-04-11 Peak Systems, Inc. Long arc lamp for semiconductor heating

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5316436B2 (ja) * 2010-01-28 2013-10-16 ウシオ電機株式会社 放電ランプ
JP5024466B1 (ja) * 2011-03-10 2012-09-12 ウシオ電機株式会社 ショートアーク型放電ランプ

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2341716A (en) * 1943-01-07 1944-02-15 Eitel Mccullough Inc Welded joint and method of making the same
US2400082A (en) * 1942-06-05 1946-05-14 Eitel Mccullough Inc Electronic tube
US2567491A (en) * 1943-12-29 1951-09-11 Mitchell John Wesley Luminous discharge tube
US2716584A (en) * 1953-12-16 1955-08-30 Westinghouse Electric Corp Double hermetic seal for gaseous discharge lamps
US3014156A (en) * 1958-03-01 1961-12-19 Osterhammel Kurt Arrangement for irradiation with ultraviolet rays
US3132279A (en) * 1961-08-11 1964-05-05 Engelhard Hanovia Inc Electrical discharge device
US3390296A (en) * 1966-03-14 1968-06-25 Trw Inc Electric discharge device having spaced electrodes sealed to opposite end of envelope

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2400082A (en) * 1942-06-05 1946-05-14 Eitel Mccullough Inc Electronic tube
US2341716A (en) * 1943-01-07 1944-02-15 Eitel Mccullough Inc Welded joint and method of making the same
US2567491A (en) * 1943-12-29 1951-09-11 Mitchell John Wesley Luminous discharge tube
US2716584A (en) * 1953-12-16 1955-08-30 Westinghouse Electric Corp Double hermetic seal for gaseous discharge lamps
US3014156A (en) * 1958-03-01 1961-12-19 Osterhammel Kurt Arrangement for irradiation with ultraviolet rays
US3132279A (en) * 1961-08-11 1964-05-05 Engelhard Hanovia Inc Electrical discharge device
US3390296A (en) * 1966-03-14 1968-06-25 Trw Inc Electric discharge device having spaced electrodes sealed to opposite end of envelope

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4820906A (en) * 1987-03-13 1989-04-11 Peak Systems, Inc. Long arc lamp for semiconductor heating

Also Published As

Publication number Publication date
NL6603392A (enrdf_load_stackoverflow) 1967-09-18
BE695554A (enrdf_load_stackoverflow) 1967-09-15
CH469349A (de) 1969-02-28
DE1589241A1 (de) 1970-03-26
DE1589241C3 (de) 1976-01-02
DE1589241B2 (enrdf_load_stackoverflow) 1975-05-22
FR1519041A (fr) 1968-03-29
GB1166401A (en) 1969-10-08
AT272458B (de) 1969-07-10

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