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GB399477A - Improvements relating to thermionic valves or electron discharge tubes - Google Patents

Improvements relating to thermionic valves or electron discharge tubes

Info

Publication number
GB399477A
GB399477A GB9513/32A GB951332A GB399477A GB 399477 A GB399477 A GB 399477A GB 9513/32 A GB9513/32 A GB 9513/32A GB 951332 A GB951332 A GB 951332A GB 399477 A GB399477 A GB 399477A
Authority
GB
United Kingdom
Prior art keywords
cathode
heating energy
steepness
maximum
grid
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
GB9513/32A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB399477A publication Critical patent/GB399477A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes

Landscapes

  • Discharge Lamps And Accessories Thereof (AREA)

Abstract

399,477. Thermionic valves. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN, 13D, Emmasingel, Eindhoven, Holland. April 2, 1932, No. 9513. Convention date, April 2, 1931. Drawings to Specification. [Class 39 (i).] The dimensions and spacing of the cathode, control grid, and anode are such that, when the standard heating energy with which the valve is normally designed to work is applied to the cathode, the ratio of the steepness to the heating energy of the cathode is a maximum regarded as a function of this heating energy, the steepness being the greatest slope of the anode current-grid voltage characteristic for negative grid voltages. Small departures of the ratio from the maximum are admissible within the range of ratios corresponding to variations of 20 per cent in the heating energy from its value for the above maximum. A definite steepness is thus obtained with a minimum of .cathode-heating energy. In practice, the cathode is larger and at a lower temperature than cathodes of known valves. Dimensions are given for a valve with a long indirectly heated cathode of rectangular crosssection surrounded by a helical wire grid and by a plate anode.
GB9513/32A 1931-04-02 1932-04-02 Improvements relating to thermionic valves or electron discharge tubes Expired GB399477A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL399477X 1931-04-02

Publications (1)

Publication Number Publication Date
GB399477A true GB399477A (en) 1933-10-02

Family

ID=19785876

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9513/32A Expired GB399477A (en) 1931-04-02 1932-04-02 Improvements relating to thermionic valves or electron discharge tubes

Country Status (2)

Country Link
FR (1) FR734466A (en)
GB (1) GB399477A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2238998A (en) * 1989-11-21 1991-06-19 Heidelberger Druckmasch Ag Printing press feeder suction head

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2238998A (en) * 1989-11-21 1991-06-19 Heidelberger Druckmasch Ag Printing press feeder suction head
US5137267A (en) * 1989-11-21 1992-08-11 Heidelberger Druckmaschinen Ag Suction head for a feeder of a sheet-fed rotary printing press
GB2238998B (en) * 1989-11-21 1994-04-27 Heidelberger Druckmasch Ag Printing press feeder suction head

Also Published As

Publication number Publication date
FR734466A (en) 1932-10-22

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