GB665279A - Improvements relating to electron discharge devices such as television transmission tubes - Google Patents

Improvements relating to electron discharge devices such as television transmission tubes

Info

Publication number
GB665279A
GB665279A GB3356248A GB3356248A GB665279A GB 665279 A GB665279 A GB 665279A GB 3356248 A GB3356248 A GB 3356248A GB 3356248 A GB3356248 A GB 3356248A GB 665279 A GB665279 A GB 665279A
Authority
GB
United Kingdom
Prior art keywords
tube
dec
terminated
oxidation
television transmission
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
GB3356248A
Inventor
Harry Cassman
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 GB3356248A priority Critical patent/GB665279A/en
Publication of GB665279A publication Critical patent/GB665279A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/36—Photoelectric screens; Charge-storage screens
    • H01J29/39—Charge-storage screens
    • H01J29/43—Charge-storage screens using photo-emissive mosaic, e.g. for orthicon, for iconoscope

Landscapes

  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)

Abstract

665,279. Electrode materials and processing. ELECTRIC & MUSICAL INDUSTRIES, Ltd. Dec. 20, 1949 [Dec. 31, 1948], No. 33562/48. Class 39 (i). In sensitising the photo-electric mosaic in a sealed discharge tube, such as a television transmission tube, the screen is oxidized whilst it is exposed to a light image of different. intensity levels and is scanned to produce electrical signals, the oxidation being terminated when the signals indicate that a required degree of sensitization has been obtained. A pick-up tube, adapted to operate with cathode potential stabilization, has its mosaic support coated by the evaporation of antimony, or of bismuth and silver alternately through a mesh, the removal of which is followed by deposition of calcium. The tube is then evacuated and sealed, mounted in a camera and a light image of alternate black and white squares projected on to the screen. Oxygen may be released by heating a side tube or capsule containing potassium chlorate, barium oxide or silver oxide, which, alternatively, may form a coating on a platinum or tantalum heating ribbon. Oxidation is terminated when the difference in signal levels corresponding to the black and white squares in a television receiver is observed to be a maximum.
GB3356248A 1948-12-31 1948-12-31 Improvements relating to electron discharge devices such as television transmission tubes Expired GB665279A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3356248A GB665279A (en) 1948-12-31 1948-12-31 Improvements relating to electron discharge devices such as television transmission tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3356248A GB665279A (en) 1948-12-31 1948-12-31 Improvements relating to electron discharge devices such as television transmission tubes

Publications (1)

Publication Number Publication Date
GB665279A true GB665279A (en) 1952-01-23

Family

ID=10354549

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3356248A Expired GB665279A (en) 1948-12-31 1948-12-31 Improvements relating to electron discharge devices such as television transmission tubes

Country Status (1)

Country Link
GB (1) GB665279A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2854985A (en) * 1954-04-12 1958-10-07 Du Pont Article of commerce
US2977252A (en) * 1955-12-21 1961-03-28 Schlumberger Well Surv Corp Photosurface and method of making same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2854985A (en) * 1954-04-12 1958-10-07 Du Pont Article of commerce
US2977252A (en) * 1955-12-21 1961-03-28 Schlumberger Well Surv Corp Photosurface and method of making same

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