GB1117024A - Improvements in thimble seals - Google Patents

Improvements in thimble seals

Info

Publication number
GB1117024A
GB1117024A GB3730065A GB3730065A GB1117024A GB 1117024 A GB1117024 A GB 1117024A GB 3730065 A GB3730065 A GB 3730065A GB 3730065 A GB3730065 A GB 3730065A GB 1117024 A GB1117024 A GB 1117024A
Authority
GB
United Kingdom
Prior art keywords
thimble
tube
rod
seal
quartz
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
GB3730065A
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.)
General Electric Co
Original Assignee
General Electric Co
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
Priority claimed from US400267A external-priority patent/US3320352A/en
Application filed by General Electric Co filed Critical General Electric Co
Publication of GB1117024A publication Critical patent/GB1117024A/en
Expired legal-status Critical Current

Links

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
    • H01J5/40—End-disc seals, e.g. flat header
    • 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
    • H01J5/40—End-disc seals, e.g. flat header
    • H01J5/42—End-disc seals, e.g. flat header using intermediate part
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0033—Vacuum connection techniques applicable to discharge tubes and lamps
    • H01J2893/0034—Lamp bases
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0033—Vacuum connection techniques applicable to discharge tubes and lamps
    • H01J2893/0034—Lamp bases
    • H01J2893/0035—Lamp bases shaped as flat plates, in particular metallic

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

<PICT:1117024/C1/1> A method of making a seal for an electric discharge device, particularly a stem preassembly therefor comprises sealing an intermediate fused quartz tube 211 peripherally at one end at some intermediate point along the length of an outer fused quartz tube 18 and then peripherally sealing an inner fused quartz tube 23 to the other end of the intermediate tube 211 and extending said inner tube 23 back through tube 211, the free end of inner tube 23 being closed at 25, hermetically sealing a molybdenum thimble 14 to a tungsten rod 5 extending through the thimble, the thimble having a "feathered" edge, inserting the thimble rod assembly into the stem pre-assembly in such a fashion that the rod 5 passes inside the inner tube 23 and the thimble 14 passes between the outer tube 18 and intermediate tube 211, applying a vacuum within the outer tube against the closed end of the thimble and applying a gas pressure to the other side thereof, and applying heat around the outer tube 18 progressively from the closed end of the thimble to its feathered edge so that both the intermediate tube and the outer tube are caused to collapse and seal against the feathered edge of the thimble 14 and also to collapse the inner tube on to and to seal it with the tungsten rod 5. So that the seals only occur at the feathered edge of the thimble and at the end of the inner tube, molybdenum foils 27, 30, 32 are placed between the thimble, rod and quartz tubes. The thimble has a length to diameter ratio of at least 1.75:1. The outer and inner quartz tubes are cut off beyond the thimble seal and a quartz-glass capillary (40), (Fig. 9, not shown), is joined on to the end of the outer tube to provide support for the tungsten rod.
GB3730065A 1964-09-29 1965-09-01 Improvements in thimble seals Expired GB1117024A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US40026864A 1964-09-29 1964-09-29
US400267A US3320352A (en) 1964-09-29 1964-09-29 Quartz-to-metal seal

Publications (1)

Publication Number Publication Date
GB1117024A true GB1117024A (en) 1968-06-12

Family

ID=27016968

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3730065A Expired GB1117024A (en) 1964-09-29 1965-09-01 Improvements in thimble seals

Country Status (2)

Country Link
DE (1) DE1489328A1 (en)
GB (1) GB1117024A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109434263A (en) * 2018-11-16 2019-03-08 梅州市凯明电光源有限公司 A kind of device and method welding high-purity tungsten bar

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109434263A (en) * 2018-11-16 2019-03-08 梅州市凯明电光源有限公司 A kind of device and method welding high-purity tungsten bar

Also Published As

Publication number Publication date
DE1489328A1 (en) 1969-03-13

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