GB1441471A - Electric discharge lamps - Google Patents

Electric discharge lamps

Info

Publication number
GB1441471A
GB1441471A GB172474A GB172474A GB1441471A GB 1441471 A GB1441471 A GB 1441471A GB 172474 A GB172474 A GB 172474A GB 172474 A GB172474 A GB 172474A GB 1441471 A GB1441471 A GB 1441471A
Authority
GB
United Kingdom
Prior art keywords
halide
scandium
metal
envelope
coating
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
GB172474A
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 PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB172474A priority Critical patent/GB1441471A/en
Publication of GB1441471A publication Critical patent/GB1441471A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/35—Vessels; Containers provided with coatings on the walls thereof; Selection of materials for the coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Discharge Lamp (AREA)

Abstract

1441471 Metal vapour discharge lamps GENERAL ELECTRIC CO Ltd 14 Jan 1975 [14 Jan 1974] 01724/74 Heading H1D A discharge lamp having a fused silica envelope and a filling including mercury, a scandium halide and possibly another metal halide (neither halide being a fluoride) and the pressure being greater than one atmosphere, has on the interior surface of the envelope a coating of at least one of the oxides of scandium, yttrium, lanthanum and the rare earth metals, the coating at least partially penetrating the surface of the silica. The oxide can be applied by forming a metal film which is then oxidized in situ prior to filling the envelope. The metal film in such a process can result from decomposition of a halide of the metal, e.g. a monohalide produced by passing a higher halide over particles of the metal, the monohalide being introduced, possibly with hydrogen, at a temperature of 900‹ to 1100‹ C., the metal film so formed being heated at 1000‹ to 1200‹ C. in an oxidizing atmosphere such as air, oxygen or inert gas with oxygen or water vapour. A typical filling is 20 mg. sodium iodide, 10 mg. scandium tri-iodide, 12 mg. mercury and argon at 20 torr at room temperature in an envelope having a diameter of 18 mm. and an arc length of 90 mm. To form the oxide coating such a lamp requires 4 mg. scandium and 12 mg. scandium tri-iodide.
GB172474A 1974-01-14 1974-01-14 Electric discharge lamps Expired GB1441471A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB172474A GB1441471A (en) 1974-01-14 1974-01-14 Electric discharge lamps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB172474A GB1441471A (en) 1974-01-14 1974-01-14 Electric discharge lamps

Publications (1)

Publication Number Publication Date
GB1441471A true GB1441471A (en) 1976-06-30

Family

ID=9726903

Family Applications (1)

Application Number Title Priority Date Filing Date
GB172474A Expired GB1441471A (en) 1974-01-14 1974-01-14 Electric discharge lamps

Country Status (1)

Country Link
GB (1) GB1441471A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2124019A (en) * 1982-07-09 1984-02-08 Philips Nv Low-pressure mercury vapour discharge lamp
GB2191888A (en) * 1986-06-05 1987-12-23 Ushio Electric Inc Fused silica envelope for discharge lamp
EP0583122A1 (en) * 1992-08-07 1994-02-16 General Electric Company ARC tube and ARC discharge lamp

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2124019A (en) * 1982-07-09 1984-02-08 Philips Nv Low-pressure mercury vapour discharge lamp
GB2191888A (en) * 1986-06-05 1987-12-23 Ushio Electric Inc Fused silica envelope for discharge lamp
EP0583122A1 (en) * 1992-08-07 1994-02-16 General Electric Company ARC tube and ARC discharge lamp

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee