GB644635A - Improvements in or relating to electron discharge devices - Google Patents

Improvements in or relating to electron discharge devices

Info

Publication number
GB644635A
GB644635A GB1785647A GB1785647A GB644635A GB 644635 A GB644635 A GB 644635A GB 1785647 A GB1785647 A GB 1785647A GB 1785647 A GB1785647 A GB 1785647A GB 644635 A GB644635 A GB 644635A
Authority
GB
United Kingdom
Prior art keywords
cathode
anode
getter
heater
envelope
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
GB1785647A
Inventor
Christopher Henry Foulkes
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.)
STC PLC
Original Assignee
Standard Telephone and Cables 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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB1785647A priority Critical patent/GB644635A/en
Priority to ES184412A priority patent/ES184412A1/en
Publication of GB644635A publication Critical patent/GB644635A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
    • H04N5/165—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level to maintain the black level constant
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H01J19/42—Mounting, supporting, spacing, or insulating of electrodes or of electrode assemblies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0002—Construction arrangements of electrode systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Abstract

644,635. Thermionic valves. STANDARD TELEPHONES & CABLES, Ltd. July 7, 1947, No. 17856. [Class 39 (i)] A thermionic valve, particularly a miniature diode for high-frequency use, comprises an anode 1 forming a metallic tubular envelope for the valve and an indirectly heated cathode comprising a cathode sleeve 7 surrounding a heater 15 and a getter 14, the envelope being sealed at one end by a glass bead 3 through which pass leads to the cathode and heater and at the other end by constriction of a metal exhaust tube 5 integral with the anode. Insulators 8, 9 are provided within the envelope to locate the cathode and are shaped either to receive the cathode, Fig. 3 (not shown), or to project into the cathode; they are provided with notches 10 through which the electrode leads extend and through which gases may pass. The getter may be of zirconium, tantalum or the like, and may be coated on the inner wall of the cathode sleeve or may be in the form of a wire 14 which may be used as the cathode leadin. The heater wire 15 and getter 14 may be cemented inside the cathode sleeve with an insulating cement such as alumina. The anode tube may be flared out at one end 2 to receive the glass bead 3 and may be glazed internally before sealing. The anode tube may be finally coated with plastic or other insulating means. Specification 549,832 is referred to.
GB1785647A 1947-07-07 1947-07-07 Improvements in or relating to electron discharge devices Expired GB644635A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1785647A GB644635A (en) 1947-07-07 1947-07-07 Improvements in or relating to electron discharge devices
ES184412A ES184412A1 (en) 1947-07-07 1948-07-01 IMPROVEMENTS IN ELECTRONIC DISCHARGE DEVICES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1785647A GB644635A (en) 1947-07-07 1947-07-07 Improvements in or relating to electron discharge devices

Publications (1)

Publication Number Publication Date
GB644635A true GB644635A (en) 1950-10-18

Family

ID=10102412

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1785647A Expired GB644635A (en) 1947-07-07 1947-07-07 Improvements in or relating to electron discharge devices

Country Status (2)

Country Link
ES (1) ES184412A1 (en)
GB (1) GB644635A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1051988B (en) * 1955-03-15 1959-03-05 Philips Nv Electron tubes with means for shielding the bottom part from the anode compartment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1051988B (en) * 1955-03-15 1959-03-05 Philips Nv Electron tubes with means for shielding the bottom part from the anode compartment

Also Published As

Publication number Publication date
ES184412A1 (en) 1948-12-16

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