US3515929A - Short arc lamp seal - Google Patents

Short arc lamp seal Download PDF

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Publication number
US3515929A
US3515929A US700195A US3515929DA US3515929A US 3515929 A US3515929 A US 3515929A US 700195 A US700195 A US 700195A US 3515929D A US3515929D A US 3515929DA US 3515929 A US3515929 A US 3515929A
Authority
US
United States
Prior art keywords
ribbon
lamp
arc lamp
quartz
short
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
US700195A
Other languages
English (en)
Inventor
Joseph P Kearney
Eugene F Murphy
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.)
Philips North America LLC
Original Assignee
Westinghouse Electric 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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Application granted granted Critical
Publication of US3515929A publication Critical patent/US3515929A/en
Assigned to NORTH AMERICAN PHILIPS ELECTRIC CORP. reassignment NORTH AMERICAN PHILIPS ELECTRIC CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WESTINGHOUSE ELECTRIC CORPORATION
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
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/32—Seals for leading-in conductors
    • H01J5/34—Seals for leading-in conductors for an individual conductor
    • 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
    • H01J61/366—Seals for leading-in conductors
    • 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
    • H01J61/366—Seals for leading-in conductors
    • H01J61/368—Pinched seals or analogous seals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/84—Lamps with discharge constricted by high pressure
    • H01J61/86—Lamps with discharge constricted by high pressure with discharge additionally constricted by close spacing of electrodes, e.g. for optical projection

Definitions

  • a quartz short-arc lamp having a central bulbous envelope portion and a pair of oppositely disposed arm portions extending from the central envelope portion through which electrical current is carried to a pair of spaced electrodes.
  • An electrode is mounted within one end of each arm and extends into the envelope portion.
  • a lead-in conductor extends into the other end of each of the arms and is connected to the electrode mounted in that arm by a plurality of ribbon conductors.
  • the juncture of the ribbon conductors with each lead-in conductor is encapsulated in a sealing composition having a coefiicient of thermal expansion less than that of quartz and preferably of lithium-aluminum-silicate powder and a suitable binder such as platinum paint.
  • Another object of this invention is to provide an airtight seal for the lead-in conductor and ribbon seal juncture area in a quartz short-arc lamp.
  • the lamp includes a central envelope or bulb portion and two outwardly extending arms. Each arm has an initially open end portion remote from the envelope and a pair of oppositely disposed electrodes mounted within the other end of the arm and extending into the envelope.
  • a lead-in conductor extends into the open end of each of the arms and is connected electrically by means of conventional ribbon conductors to the electrode in that arm.
  • a ceramic sealing composition is disposed wtihin the open end of the arm and encapsulates the connection between the ribbon conductors and the lead-in conductor.
  • the ceramic sealing composition may be formed from a mixture of lithium-aluminum-silicate powder and a suitable binder such as for example platinum paint.
  • FIG. 2 is a sectional view taken along the line IIII of FIG. 1;
  • FIG. 3 is a sectional view taken along the line III--III of FIG. 2;
  • FIG. 4 is an end view of one of the arm portions of the short-arc lamp with a portion of the sealing composition broken away.
  • the ribbon conductors 26 connect each electrode 14 with its associated lead-in conductor 22 substantially in the manner described in detail in US. Pat. 2,682,009 to H. D. Frazer for Seal and Method of Fabrication, issued June 22, 1954, and owned by the assignee of the present invention.
  • the ribbon conductors 26 generally consist of two end sections 28 which may be of a thickness of about 0.002 inch connected by an intermediate section 30 which is approximately 0.0006 inch thick with the thicker end sections connecting the ribbon conductors to the electrode and lead-in conductor. Over the ledge defined by the intersection of the end of end sections 28 and intermediate ribbon 30 are welded a thin flap of molybdenum 32 or other suitable material of a thickness equivalent to the intermediate section 30.
  • FIG. 3 illustrates a sectional view through the juncture of the end section 28 with the intermediate ribbon 30 and the overlying molybdenum flap 32.
  • the critical points where oxidation as above-described may occur, if the ends of the arms 16 are not properly sealed, is that portion of end sections 28 which overly the end of the dowel member 20 and the interstices between and around the juncture at 36 where the ribbon conductor 28 enters the space between the dowel 20 and outer cylindrical member 18 adjacent the ends of intermediate ribbon 30 at the molybdenum flap 32.
  • the coefficient of expansion of quartz being about 5 10-"', to provide a good seal at the ends of the arms, it is contemplated by the present invention to use a sealing material which has a coefficient of expansion which approximates that of the quartz or preferably which is just slightly less than that of quartz.
  • a mixture of lithium-aluminam-silicate powder for example that which is manufactured under the trade name Lithafrax by the Refractories Division of the Carborandum Corporation is one suitable powder.
  • the fired, ground lithium-aluminum-silicate powders are mixed with a small amount of binder such as for example platinum paint, sodium silicate, potassium silicate, nitro-cellulose, or other similar binder type material.
  • binder such as for example platinum paint, sodium silicate, potassium silicate, nitro-cellulose, or other similar binder type material.
  • the amount and type of binder necessary is not critical but it is preferable that it be sufiicient to provide a paste like consistency to the mixture. Platinum paint, however, is preferred.
  • a binder such as for example platinum paint, sodium silicate, potassium silicate, nitro-cellulose, or other similar binder type material.
  • the amount and type of binder necessary is not critical but it is preferable that it be sufiicient to provide a paste like consistency to the mixture. Platinum paint,
  • the binder alone is put into the crevice or opening 36 to serve as a leader for the powder and binder mixture 40.
  • the mixture of the lithium-aluminum-silicate powder and binder is then placed in the crevice or opening 38 to fill that opening.
  • the material 40 is then warmed for a few moments by a heat gun in order to partially set the sealant and prevent it from falling out of the lamp. When the lamp is operated the sealant material will set itself completely.
  • the coefficient of thermal expansion for the lithium-aluminum-silicate powders range from 5 10- to+3 10- which is slightly less than the coefiicient of thermal expansion of the quartz.
  • the lamp of the present invention employs a ribbon type seal which regardless of lamp application prohibits the exposure to air of the ribbon conductors and eliminates the occurrence of any oxidation of the ribbons which can eventually cause failure of the lamp.
  • Ribbon sealed lamps may now have a longer life since the sealant material no longer, due to generally very high expansion coeflicients, is pushed out of the crevice and away from the ribbons and replaced by air.
  • a short-arc lamp comprising:
  • a ceramic sealing composition surrounding the juncture of the ribbon conductors 'with each lead-in conductor and encapsulating said juncture, said sealing composition having a coefiicient of thermal expansion equivalent to or less than the coefiicient of thermal expansion of said quartz.
  • a short-arc lamp according to claim 1 wherein said sealing composition consists essentially of a lithiumaluminum-silicate powder and a binder material.
  • a short-arc lamp comprising:

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
US700195A 1968-01-24 1968-01-24 Short arc lamp seal Expired - Lifetime US3515929A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US70019568A 1968-01-24 1968-01-24

Publications (1)

Publication Number Publication Date
US3515929A true US3515929A (en) 1970-06-02

Family

ID=24812540

Family Applications (1)

Application Number Title Priority Date Filing Date
US700195A Expired - Lifetime US3515929A (en) 1968-01-24 1968-01-24 Short arc lamp seal

Country Status (4)

Country Link
US (1) US3515929A (es)
JP (1) JPS4918192B1 (es)
DE (1) DE1902170A1 (es)
GB (1) GB1231141A (es)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4677338A (en) * 1982-05-07 1987-06-30 The General Electric Company, P.L.C. Electric lamps having outer stem surface which minimizes internal reflections
US6583562B1 (en) * 1999-08-31 2003-06-24 Koninklijke Philips Electronics N.V. Metal halide lamp with gas-tight seal
RU2566245C1 (ru) * 2014-03-26 2015-10-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Российский университет дружбы народов" (РУДН) Ротационный резец

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6066423U (ja) * 1983-10-12 1985-05-11 三洋電機株式会社 柔軟部品片の分離供給装置
DE4031117A1 (de) * 1990-10-02 1992-04-09 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Hochdruckentladungslampe und verfahren zur herstellung der lampe
DE9013735U1 (es) * 1990-10-02 1992-02-06 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh, 8000 Muenchen, De
JP3591439B2 (ja) * 2000-09-21 2004-11-17 ウシオ電機株式会社 ショートアーク放電ランプ
WO2009046749A1 (de) * 2007-10-02 2009-04-16 Osram Gesellschaft mit beschränkter Haftung Elektrische lampe mit einem lampenkolben und verfahren zum herstellen einer elektrischen lampe

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2682009A (en) * 1952-12-31 1954-06-22 Westinghouse Electric Corp Seal and method of fabrication
GB818202A (en) * 1956-06-02 1959-08-12 Csf Improvements in or relating to insulation to metal seals with a high melting point
US3211826A (en) * 1961-03-16 1965-10-12 Gen Electric Quartz to metal seal

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2682009A (en) * 1952-12-31 1954-06-22 Westinghouse Electric Corp Seal and method of fabrication
GB818202A (en) * 1956-06-02 1959-08-12 Csf Improvements in or relating to insulation to metal seals with a high melting point
US3211826A (en) * 1961-03-16 1965-10-12 Gen Electric Quartz to metal seal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4677338A (en) * 1982-05-07 1987-06-30 The General Electric Company, P.L.C. Electric lamps having outer stem surface which minimizes internal reflections
US6583562B1 (en) * 1999-08-31 2003-06-24 Koninklijke Philips Electronics N.V. Metal halide lamp with gas-tight seal
RU2566245C1 (ru) * 2014-03-26 2015-10-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Российский университет дружбы народов" (РУДН) Ротационный резец

Also Published As

Publication number Publication date
JPS4918192B1 (es) 1974-05-08
GB1231141A (es) 1971-05-12
DE1902170A1 (de) 1969-09-04

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Legal Events

Date Code Title Description
AS Assignment

Owner name: NORTH AMERICAN PHILIPS ELECTRIC CORP.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WESTINGHOUSE ELECTRIC CORPORATION;REEL/FRAME:004113/0393

Effective date: 19830316