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GB476830A - Improvements in or relating to cathode ray tubes and the like - Google Patents

Improvements in or relating to cathode ray tubes and the like

Info

Publication number
GB476830A
GB476830A GB24236/36A GB2423636A GB476830A GB 476830 A GB476830 A GB 476830A GB 24236/36 A GB24236/36 A GB 24236/36A GB 2423636 A GB2423636 A GB 2423636A GB 476830 A GB476830 A GB 476830A
Authority
GB
United Kingdom
Prior art keywords
cathode
washer
electrode
shoulder
face
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
GB24236/36A
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.)
RONALD OSMOND JENKINS
General Electric Co PLC
Original Assignee
RONALD OSMOND JENKINS
General Electric Co 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 RONALD OSMOND JENKINS, General Electric Co PLC filed Critical RONALD OSMOND JENKINS
Priority to GB24236/36A priority Critical patent/GB476830A/en
Priority to US160756A priority patent/US2125418A/en
Publication of GB476830A publication Critical patent/GB476830A/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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/52—Arrangements for controlling intensity of ray or beam, e.g. for modulation
    • 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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • H01J29/485—Construction of the gun or of parts thereof

Landscapes

  • Electron Tubes For Measurement (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Abstract

476,830. Cathode-ray tubes. GENERAL ELECTRIC CO., Ltd., BENJAMIN, M., and JENKINS, R. O. Sept. 4, 1936, Nos. 24236 and 31823. [Class 39 (i)] In a cathode-ray tube or the like, in which an indirectly-heated cathode 6 of cylindrical form and having at one end a thermionically active surface 3, Fig. 1, is to be accurately located relatively to some face of a modulating electrode 1, the cathode is provided with a shoulder 7 which abuts against a washer 4 of insulating material, such as mica or steatite, so that a relatively small part 8 bearing the surface 3 projects into or through a hole in the washer, and the washer fits into a recess in the electrode 1 so that one of its faces abuts against the face of the electrode. The electrode 1 has an aperture 2 in which the emissive surface lies. In a modification, a narrow cathode has a projecting shoulder and is preferably introduced into the washer from above so that the shoulder engages the top face of the washer. In another form, shown in Fig. 3, the modulating electrode is divided into two parts 1 and 11 spaced a small distance apart and the cathode is supported from part 1 so that the plane of the emissive surface 3 lies between the two parts. Part 11 has an extension 12 reaching nearly to the anode 13. In practice, the modulation is applied to part 11, while a constant bias applied to part 1 enables the slope of the characteristics to be varied. Typical curves of this variation as shown. Dimensions and spacing of the electrodes are specified.
GB24236/36A 1936-09-04 1936-09-04 Improvements in or relating to cathode ray tubes and the like Expired GB476830A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB24236/36A GB476830A (en) 1936-09-04 1936-09-04 Improvements in or relating to cathode ray tubes and the like
US160756A US2125418A (en) 1936-09-04 1937-08-25 Construction of electrodes for cathode ray tubes and the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB24236/36A GB476830A (en) 1936-09-04 1936-09-04 Improvements in or relating to cathode ray tubes and the like

Publications (1)

Publication Number Publication Date
GB476830A true GB476830A (en) 1937-12-16

Family

ID=10208558

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24236/36A Expired GB476830A (en) 1936-09-04 1936-09-04 Improvements in or relating to cathode ray tubes and the like

Country Status (2)

Country Link
US (1) US2125418A (en)
GB (1) GB476830A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732512A (en) * 1956-01-24 briggs
US2616038A (en) * 1947-09-23 1952-10-28 Univ Leland Stanford Junior Frequency converter
US2570165A (en) * 1949-08-16 1951-10-02 Rca Corp Limited-area cathode
US2672568A (en) * 1951-03-27 1954-03-16 Int Standard Electric Corp Electron gun for cathode-ray tubes
US2892115A (en) * 1955-12-20 1959-06-23 Itt Cathode structures
US3130340A (en) * 1959-10-16 1964-04-21 Tesla Np Electron gun for generating a hollow beam
US3278779A (en) * 1962-05-17 1966-10-11 Rauland Corp Cathode-ray tube having an insulating spacer between the cathode and the control grid
US4251747A (en) * 1979-11-15 1981-02-17 Gte Products Corporation One piece astigmatic grid for color picture tube electron gun

Also Published As

Publication number Publication date
US2125418A (en) 1938-08-02

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