GB664813A - Improvements relating to apparatus embodying electron discharge tubes - Google Patents

Improvements relating to apparatus embodying electron discharge tubes

Info

Publication number
GB664813A
GB664813A GB23920/47A GB2392047A GB664813A GB 664813 A GB664813 A GB 664813A GB 23920/47 A GB23920/47 A GB 23920/47A GB 2392047 A GB2392047 A GB 2392047A GB 664813 A GB664813 A GB 664813A
Authority
GB
United Kingdom
Prior art keywords
target
field
focusing
electric field
producing
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
GB23920/47A
Inventor
James Dwyer Mcgee
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries 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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB23920/47A priority Critical patent/GB664813A/en
Priority to US45139A priority patent/US2572644A/en
Publication of GB664813A publication Critical patent/GB664813A/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

Landscapes

  • X-Ray Techniques (AREA)
  • Details Of Television Scanning (AREA)

Abstract

664,813. Cathode-ray tubes. ELECTRIC & MUSICAL INDUSTRIES, Ltd. July 23, 1948 [Aug. 29, 1947], No. 23920/47. Drawings to Specification. Class 39 (i). In apparatus of the type embodying an electron discharge tube wherein an electron beam is directed to a target through a substantially uniform axial magnetic focusing field extending along substantially the whole path of the beam and wherein the electrons, as they approach the target, pass through an electric field which decelerates them so that they impinge on the target with substantially zero velocity, the decelerating electric field also producing a radial electric field which leads to spiral distortion, means are provided for producing a radial magnetic field in the region of the decelerating electric field so as to substantially eliminate spiral distortion. To produce the radial magnetic field a short auxiliary coil for producing a magnetic field opposed to the focusing field may be provided in the neighbourhood of the target, Fig. 1 (not shown). In another arrangement, Fig. 2 (not shown), the focusing coil is formed in two axially spaced parts. In a further arrangement, Fig. 3 (not shown), the focusing coil extends beyond the end of the tube and the target is disposed in a suitably divergent part of the focusing field of the coil.
GB23920/47A 1947-08-29 1947-08-29 Improvements relating to apparatus embodying electron discharge tubes Expired GB664813A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB23920/47A GB664813A (en) 1947-08-29 1947-08-29 Improvements relating to apparatus embodying electron discharge tubes
US45139A US2572644A (en) 1947-08-29 1948-08-19 Electron discharge tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB23920/47A GB664813A (en) 1947-08-29 1947-08-29 Improvements relating to apparatus embodying electron discharge tubes

Publications (1)

Publication Number Publication Date
GB664813A true GB664813A (en) 1952-01-16

Family

ID=10203431

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23920/47A Expired GB664813A (en) 1947-08-29 1947-08-29 Improvements relating to apparatus embodying electron discharge tubes

Country Status (2)

Country Link
US (1) US2572644A (en)
GB (1) GB664813A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3659140A (en) * 1968-06-20 1972-04-25 Tokyo Shibaura Electric Co Image pickup tube device utilizing a magnetic field generator to reverse the leakage field

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2803770A (en) * 1950-09-18 1957-08-20 Fernseh Gmbh Electron discharge tube apparatus
US2757233A (en) * 1951-09-29 1956-07-31 Emi Ltd Electron discharge tube arrangements
GB822166A (en) * 1954-09-20 1959-10-21 Julius Cato Vredenburg Inglesb Cathode ray image producing system and apparatus
US2879082A (en) * 1956-06-05 1959-03-24 Wade & Co R M Self locking latch means for pipe line couplers

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2140284A (en) * 1931-07-14 1938-12-13 Farnsworth Television Inc Projecting oscillight
GB497645A (en) * 1937-05-20 1938-12-20 Hans Gerhard Lubszynski Improvements in or relating to electron lenses
BE433926A (en) * 1938-05-12
CA432539A (en) * 1938-06-28 1946-01-15 Electric And Musical Industries Limited Magnetic electron lens
GB539422A (en) * 1940-02-06 1941-09-10 Standard Telephones Cables Ltd Improvements in or relating to arrangments for producing concentrated beams of electrons, particularly for electron discharge apparatus of the velocity modulation type
US2314409A (en) * 1940-09-28 1943-03-23 Bell Telephone Labor Inc Magnetic coil structure
US2460093A (en) * 1945-04-19 1949-01-25 Rca Corp Cathode beam transmitter tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3659140A (en) * 1968-06-20 1972-04-25 Tokyo Shibaura Electric Co Image pickup tube device utilizing a magnetic field generator to reverse the leakage field

Also Published As

Publication number Publication date
US2572644A (en) 1951-10-23

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