GB452125A - Improvements in and relating to cathode ray tubes - Google Patents

Improvements in and relating to cathode ray tubes

Info

Publication number
GB452125A
GB452125A GB2023736A GB2023736A GB452125A GB 452125 A GB452125 A GB 452125A GB 2023736 A GB2023736 A GB 2023736A GB 2023736 A GB2023736 A GB 2023736A GB 452125 A GB452125 A GB 452125A
Authority
GB
United Kingdom
Prior art keywords
screen
electrodes
cathode
ray
electrode
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
GB2023736A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB452125A publication Critical patent/GB452125A/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
    • H01J29/58—Arrangements for focusing or reflecting ray or beam
    • H01J29/62—Electrostatic lenses
    • H01J29/622—Electrostatic lenses producing fields exhibiting symmetry of revolution
    • H01J29/624—Electrostatic lenses producing fields exhibiting symmetry of revolution co-operating with or closely associated to an electron gun

Landscapes

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

Abstract

452,125. Cathode-ray tubes. NICOLL, F. H., 17, The Drive, Ickenham, near Uxbridge, Middlesex. Feb. 13, 1935, No. 20237/36. Divided out of 452,012. [Class 39 (i)] In a circuit for television &c. transmission including a cathode-ray tube with an electrode system for focusing an electron beam on to a transmitting screen 11 and with means for deflecting the beam to scan the screen 11 to neutralize an electrostatic image of the picture to be transmitted, the two focusing electrodes 8, 9 nearest the screen 11 form an electron lens with the electrode 8 nearer the cathode 4 at a higher positive potential than the electrode 9. The tube shown has a cathode shield 5, an accelerator 6 and a modulating electrode 7, in addition to the anodes 8, 9 as described in Specification 431,327 and the electrodes are supplied from tappings on a potentiometer 12, 13. The anode 9 may be a silvering on the wall of the tube, and may be at the same potential as the accelerator 6 so that fluctuations in the currents to the electrodes 6, 9 neutralize one another and the size of the potentiometer and smoothing condensers can be reduced. The low potential on the anode 9 reduces secondary emission from the screen 11 and prevents secondary and cold-emission electrons from the anode 8 from reaching the screen. The screen may be a photo-electric mosaic and may be photoelectric on the side opposite to that scanned by the ray as described in Specification 419,452. Electrodes not focusing the ray, for example, a grid, may be placed in front of the screen 11. The Provisional Specification describes also subject-matter included in Specification 452,012.
GB2023736A 1935-02-13 1935-02-13 Improvements in and relating to cathode ray tubes Expired GB452125A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB467235A GB452012A (en) 1935-02-13 1935-02-13 Improvements in and relating to cathode ray tubes

Publications (1)

Publication Number Publication Date
GB452125A true GB452125A (en) 1936-08-13

Family

ID=9781598

Family Applications (2)

Application Number Title Priority Date Filing Date
GB2023736A Expired GB452125A (en) 1935-02-13 1935-02-13 Improvements in and relating to cathode ray tubes
GB467235A Expired GB452012A (en) 1935-02-13 1935-02-13 Improvements in and relating to cathode ray tubes

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB467235A Expired GB452012A (en) 1935-02-13 1935-02-13 Improvements in and relating to cathode ray tubes

Country Status (2)

Country Link
FR (1) FR802715A (en)
GB (2) GB452125A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE750227C (en) * 1937-06-18 1944-12-20 Rca Corp Cylindrical electrode for use as an anode in cathode ray tubes

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3205391A (en) * 1957-11-18 1965-09-07 Multi Tron Lab Inc Negative-lens type deflection magnifying means for electron beam in cathode ray tubes
US3154710A (en) * 1958-11-13 1964-10-27 Motorola Inc Cathode-ray display system having electrostatic magnifying lens
NL250540A (en) * 1959-04-16

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE750227C (en) * 1937-06-18 1944-12-20 Rca Corp Cylindrical electrode for use as an anode in cathode ray tubes

Also Published As

Publication number Publication date
FR802715A (en) 1936-09-14
GB452012A (en) 1936-08-13

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