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GB1014026A - Improvements in or relating to magnetic focusing arrangements for electron beams - Google Patents

Improvements in or relating to magnetic focusing arrangements for electron beams

Info

Publication number
GB1014026A
GB1014026A GB32369/62A GB3236962A GB1014026A GB 1014026 A GB1014026 A GB 1014026A GB 32369/62 A GB32369/62 A GB 32369/62A GB 3236962 A GB3236962 A GB 3236962A GB 1014026 A GB1014026 A GB 1014026A
Authority
GB
United Kingdom
Prior art keywords
casing
tube
halves
cathode
magnets
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
GB32369/62A
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.)
Telefunken Patentverwertungs GmbH
Original Assignee
Telefunken Patentverwertungs GmbH
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 Telefunken Patentverwertungs GmbH filed Critical Telefunken Patentverwertungs GmbH
Publication of GB1014026A publication Critical patent/GB1014026A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/30—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical otherwise than with constant velocity or otherwise than in pattern formed by unidirectional, straight, substantially horizontal or vertical lines
    • H04N3/34—Elemental scanning area oscillated rapidly in direction transverse to main scanning direction
    • 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
    • H01J29/56—Arrangements for controlling cross-section of ray or beam; Arrangements for correcting aberration of beam, e.g. due to lenses
    • 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
    • H01J29/64—Magnetic lenses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/26—Modifications of scanning arrangements to improve focusing

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Abstract

1,014,026. Cathode-ray tubes. TELEFUNKEN PATENTVERWERTUNGS- G.m.b.H. Aug. 23, 1962 [Aug. 23, 1961; March 24, 1962; April 18, 1962], No. 32369/62. Heading H1D. In order to mask the line structure of the scanning raster of a cathode-ray tube, the scanning spot is elongated in a direction perpendicular to the lines by means of diametrically oppositely disposed two pairs of magnets 8, 9, Fig. 2, magnetized in a direction parallel with the beam axis laminations 14 constituting polepieces. The magnets are mounted in cylindrical cavities in a non-magnetic yoke 7 which may be clipped on the neck of the tube. A spring strip 12 is embedded by injection or casting into the yoke 7. More than two cavities may be provided, as shown, so that varying degrees of elongation may be obtained as desired by varying the number of magnets used. Alternatively, an electromagnet may be used comprising a winding (not shown) and a ferromagnetic casing 16, Fig. 3, formed of two halves, each having cut-away regions 17 to leave, effectively, polepieces 19 formed by the flanges on both halves of the casing, an airgap left between the flanges when the casing is assembled giving the required field. The airgap need not be central but located nearer the screen end of the tube, or the air-gap may be helical rather than circular. Springy tongues of insulating material are mounted on one of the halves of the casing to hold the assembly in position on the tube neck. The Specification describes a switching circuit for use with a cathode-ray tube to give either normal operation or to include the auxiliary magnetic system for giving an ellipsoidal scanning spot.
GB32369/62A 1961-08-23 1962-08-23 Improvements in or relating to magnetic focusing arrangements for electron beams Expired GB1014026A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DET20634A DE1163985B (en) 1961-08-23 1961-08-23 Magnetic electron lens to reduce the line structure in television receivers
DET21826A DE1147624B (en) 1961-08-23 1962-03-24 Device that can be switched off to suppress the line structure in a television receiver
DET21988A DE1158554B (en) 1961-08-23 1962-04-18 Electromagnetic focusing system to suppress the line structure in a television receiver

Publications (1)

Publication Number Publication Date
GB1014026A true GB1014026A (en) 1965-12-22

Family

ID=27213075

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32369/62A Expired GB1014026A (en) 1961-08-23 1962-08-23 Improvements in or relating to magnetic focusing arrangements for electron beams

Country Status (4)

Country Link
US (1) US3230415A (en)
BE (1) BE620211A (en)
DE (3) DE1163985B (en)
GB (1) GB1014026A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3930181A (en) * 1973-12-28 1975-12-30 Ibm Lens and deflection unit arrangement for electron beam columns
FR2569278B1 (en) * 1984-08-14 1988-04-08 Thomson Csf IMAGE TRANSPORT DEVICE BY OPTICAL CABLE
NL8601512A (en) * 1986-06-11 1988-01-04 Philips Nv CATHODE BEAM WITH MAGNETIC FOCUSING LENS.
EP0551027B1 (en) * 1992-01-10 1997-09-17 THOMSON TUBES & DISPLAYS S.A. Magnetic focusing device
SG92590A1 (en) * 1992-03-27 2002-11-19 Thomson Tubes & Displays Permanent magnet focus unit wihh integral astigmatism corrector

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL59170C (en) * 1940-03-09
US2648036A (en) * 1946-03-12 1953-08-04 Us Navy Adjustable focusing coil
BE519060A (en) * 1952-04-10
US2718606A (en) * 1952-08-02 1955-09-20 Gen Electric Combination electromagnet-permanent magnet focusing devices
AT189661B (en) * 1955-12-19 1957-04-25 Nikolaus Eltz Radiotechnische Arrangement for line suppression
US2883569A (en) * 1956-01-24 1959-04-21 Herman F Kaiser Magnetic quadrupole focusing system
DE1793797U (en) * 1957-07-13 1959-08-20 Erso Vertrieb Adrion & Co DEVICE FOR HOLDING LIGHTS, TOOLS AND THE LIKE. BY MEANS OF ADHESIVE MAGNET.

Also Published As

Publication number Publication date
BE620211A (en)
US3230415A (en) 1966-01-18
DE1158554B (en) 1963-12-05
DE1163985B (en) 1964-02-27
DE1147624B (en) 1963-04-25

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