GB482461A - Improvements relating to electron discharge devices - Google Patents

Improvements relating to electron discharge devices

Info

Publication number
GB482461A
GB482461A GB29557/36A GB2955736A GB482461A GB 482461 A GB482461 A GB 482461A GB 29557/36 A GB29557/36 A GB 29557/36A GB 2955736 A GB2955736 A GB 2955736A GB 482461 A GB482461 A GB 482461A
Authority
GB
United Kingdom
Prior art keywords
cathode
lead
grid
sealed
wire
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
GB29557/36A
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
Publication of GB482461A publication Critical patent/GB482461A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H01J19/02—Electron-emitting electrodes; Cathodes
    • 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

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)
  • Microwave Tubes (AREA)

Abstract

482,461. Thermionic valves. STANDARD TELEPHONES & CABLES, Ltd. Oct. 30, 1936, No. 29557. Convention date, Jan. 23. [Class 39 (i)] A valve of small size has a cathode surrounded by and spaced from an independentlysupported grid at a distance of 0À005 to 0À01 inch, and insulating material is provided on one or both ends of the cathode to prevent conductive contact between the cathode and grid, should those electrodes come into mechanical contact. As shown in Fig. 5, ceramic collars 36, 37 or rings of oxide of magnesium, aluminium or beryllium are mounted on the ends of an indirectly-heated cathode 23, the diameter of the collars being slightly less than the internal diameter of the helical grid 13. The cathode core wire 16, forming a connection to the cathode and one end of the heater, is supported on a lead 24, Fig. 1, extending at rightangles to the cathode and sealed through the envelope, which has a diameter of one-half inch. A vertical lead 27 is connected with the other end of the heater. The grid 13 is welded to a wire 25 connected with a lead 26 at rightangles with the line 25 and the cathode lead 24. A screen grid 14 consists of a helical wire mounted on two rods 28, 29 in the plane of the grid wire 25 and the cathode core wire 16, the rod 28 being mounted on a lead 30 sealed at right-angles with the lead 26 and in line with the lead 24. The anode 12 is supported by a lead 33 sealed through the other end of the envelope. A helical wire suppressor grid 15 is connected with the cathode lead 24 and carries a metal screening disc 34. A shield 35 of smaller diameter is mounted on the other end of the suppressor grid. Dimensions are given. In a modification, Figs. 2 and 3 (not shown), the leads for the cathode and grids are sealed through one end of the envelope and arranged parallel with each other, and the larger screen is flanged and attached by tabs to the supports. A lead connected with this screen is sealed through the side of the envelope.
GB29557/36A 1936-01-23 1936-10-30 Improvements relating to electron discharge devices Expired GB482461A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US482461XA 1936-01-23 1936-01-23

Publications (1)

Publication Number Publication Date
GB482461A true GB482461A (en) 1938-03-30

Family

ID=21953494

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29557/36A Expired GB482461A (en) 1936-01-23 1936-10-30 Improvements relating to electron discharge devices

Country Status (1)

Country Link
GB (1) GB482461A (en)

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