GB644330A - Improvements relating to electron discharge devices - Google Patents

Improvements relating to electron discharge devices

Info

Publication number
GB644330A
GB644330A GB2906147A GB2906147A GB644330A GB 644330 A GB644330 A GB 644330A GB 2906147 A GB2906147 A GB 2906147A GB 2906147 A GB2906147 A GB 2906147A GB 644330 A GB644330 A GB 644330A
Authority
GB
United Kingdom
Prior art keywords
deposit
envelope
electric
bismuth
photo
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
GB2906147A
Inventor
Alfred Sommer
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries Ltd
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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB2906147A priority Critical patent/GB644330A/en
Publication of GB644330A publication Critical patent/GB644330A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/12—Manufacture of electrodes or electrode systems of photo-emissive cathodes; of secondary-emission electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2201/00—Electrodes common to discharge tubes
    • H01J2201/32—Secondary emission electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2201/00—Electrodes common to discharge tubes
    • H01J2201/34—Photoemissive electrodes

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)

Abstract

644,330. Cathode materials and processing. ELECTRIC & MUSICAL INDUSTRIES, Ltd. Oct. 31, 1947, No. 29061. [Class 39 (i)] A method of making a photo-electric or secondary emissive cathode comprises providing a metal deposit inside an envelope before it is exhausted so that the deposit is exposed to air, exhausting the envelope, oxidizing the deposit before baking the envelope, and subsequently treating the deposit with an alkali metal. The deposit may be of bismuth and silver, or antimony may be used instead of bismuth, and gold instead of silver ; the deposit may be formed outside the envelope on a support which is subsequently inserted in the envelope. The invention may be applied to the manufacture of television transmission tubes with transparent mosaic screens, or photo-electric cells, or electron multipliers.
GB2906147A 1947-10-31 1947-10-31 Improvements relating to electron discharge devices Expired GB644330A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2906147A GB644330A (en) 1947-10-31 1947-10-31 Improvements relating to electron discharge devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2906147A GB644330A (en) 1947-10-31 1947-10-31 Improvements relating to electron discharge devices

Publications (1)

Publication Number Publication Date
GB644330A true GB644330A (en) 1950-10-11

Family

ID=10285573

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2906147A Expired GB644330A (en) 1947-10-31 1947-10-31 Improvements relating to electron discharge devices

Country Status (1)

Country Link
GB (1) GB644330A (en)

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