GB551665A - Improvements in cathode ray tubes - Google Patents

Improvements in cathode ray tubes

Info

Publication number
GB551665A
GB551665A GB10847/41A GB1084741A GB551665A GB 551665 A GB551665 A GB 551665A GB 10847/41 A GB10847/41 A GB 10847/41A GB 1084741 A GB1084741 A GB 1084741A GB 551665 A GB551665 A GB 551665A
Authority
GB
United Kingdom
Prior art keywords
electrons
screen
electron
field
cathode
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
GB10847/41A
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
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 Marconis Wireless Telegraph Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB551665A publication Critical patent/GB551665A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/26—Image pick-up tubes having an input of visible light and electric output
    • H01J31/28—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen
    • H01J31/34—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen having regulation of screen potential at cathode potential, e.g. orthicon

Abstract

551,665. Cathode-ray tubes. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Aug. 25, 1941, No. 10847. Convention date, Aug. 23, 1940. [Class 39 (i)] In a cathode-ray tube of the type having a longitudinal magnetic focusing-field, the .effective diameter of the electron beam and the size of the resultant spot on the screen' is reduced by rejecting those electrons having a radial component of velocity exceeding 0.66 electron-volt. This is done by interposing two spaced apertured electrodes 24, 25 in the path of the beam and a formula is given relating the maximum radial velocity passed by the arrangement to the sum of the radii of the two apertures, their separation and potentials, and the length of a loop' performed by the electron in the magnetic field. The radii may be unequal, with the smaller nearer the electron gun. The apertures in electrodes 24, 25 may be of circular, rectangular or other shape. A television transmitter of the " orthicon " type is described in which electrons from a gun 3 pass through an accelerating anode 23, which may be omitted, to the two selecting apertured discs 24, 25, thence through slotted shield 10, deflecting plates 9, deflecting field 1'6 to mosaic screen 2. Owing to the immersion in the longitudinal magnetic field of coil 15, deflection occurs at right angles to the normal directions. The screen 2 is held at a potential near that of the cathode, so that the electrons approaching it with nearly zero velocity are selectively reflected in accordance with the potential distribution set up on the mosaic by the picture. The returning electrons follow the same path through field 16 through shield 11, diverge between plates 9 and, passing through slot 12 in shield 10; strike electrode 25. The magnetic field 16 may be replaced by deflecting plates, when the electrons do not return to plate 25. The screen 2 may also be fluorescent, photo-conductive or photo-voltaic. Numerical values of dimensions, spacing and potentials are given in examples. Specification 542,496 is referred to.
GB10847/41A 1940-08-23 1941-08-25 Improvements in cathode ray tubes Expired GB551665A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US353792A US2266621A (en) 1940-08-23 1940-08-23 Cathode ray tube system

Publications (1)

Publication Number Publication Date
GB551665A true GB551665A (en) 1943-03-04

Family

ID=23390594

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10847/41A Expired GB551665A (en) 1940-08-23 1941-08-25 Improvements in cathode ray tubes

Country Status (2)

Country Link
US (1) US2266621A (en)
GB (1) GB551665A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2137802A (en) * 1983-01-27 1984-10-10 Thor Cryogenics Ltd Electron Filter

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE481370A (en) * 1939-05-26
DE1007359B (en) * 1953-05-08 1957-05-02 Philips Nv Image recording tube with image electrode stabilized at cathode potential
US2977501A (en) * 1956-06-14 1961-03-28 Edgerton Germeshausen & Grier Cathode-ray apparatus and method
US3432711A (en) * 1966-07-05 1969-03-11 Itt Hybrid deflection image dissector having concave deflection plates converging at horizontal edges of resolving apertures
JPS5652846A (en) * 1979-10-03 1981-05-12 Hitachi Ltd Electrostatically focusing and electromagnetically deflecting image pick-up tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2137802A (en) * 1983-01-27 1984-10-10 Thor Cryogenics Ltd Electron Filter

Also Published As

Publication number Publication date
US2266621A (en) 1941-12-16

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