GB670021A - Improvements in beam centering devices for cathode ray tubes - Google Patents

Improvements in beam centering devices for cathode ray tubes

Info

Publication number
GB670021A
GB670021A GB4446/49A GB444649A GB670021A GB 670021 A GB670021 A GB 670021A GB 4446/49 A GB4446/49 A GB 4446/49A GB 444649 A GB444649 A GB 444649A GB 670021 A GB670021 A GB 670021A
Authority
GB
United Kingdom
Prior art keywords
magnets
ring
rings
tube
magnet
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
GB4446/49A
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.)
Pye Electronic Products Ltd
Original Assignee
Pye 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 Pye Ltd filed Critical Pye Ltd
Priority to GB4446/49A priority Critical patent/GB670021A/en
Priority to US144688A priority patent/US2597298A/en
Priority to DEP4285A priority patent/DE973714C/en
Publication of GB670021A publication Critical patent/GB670021A/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
    • H01J29/54—Arrangements for centring ray or beam

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Abstract

670,021. Cathode-ray tubes. COURT, P. R. J., and PYE, Ltd. Feb. 20, 1950 [Feb. 18, 1949], No. 4446/49. Class 39 (i). [Also in Group XXXV] A beam centring device comprises two annular permanent magnets, each magnetized across its diameter, which are independently rotatable and are arranged adjacent each other and concentrically on the neck of the cathode-ray tube. Ring magnets 1, 2 having lugs 1a, 2a are spaced by an insulating ring and from the focusing magnet 3 by three non-magnetic, preferably insulating, rings, the middle one of which is corrugated. Clips 10a, screwed to the magnet 3, and having ends 10b bent over a further insulating ring, engage in slots in the insulating rings to permit rotation of the magnets 1a, 2a only. In another form, each ring magnet may comprise two half-rings having closely-spaced ends and mounted on a non-magnetic ring having lugs to facilitate rotation on the tube neck. Non-magnetic rings may space the magnets from the focusing magnet and also from the deflecting coils. The magnets may be rotatable around a grooved cylinder mounted at that end of the deflection coils nearer the conical part of the tube, whereby interception of the beam by the tube can be reduced. The magnets may carry windings separately and variably energized in opposition to the field produced by the magnets when arranged at right angles to each other. Electrostatic deflection and focusing may be used.
GB4446/49A 1949-02-18 1949-02-18 Improvements in beam centering devices for cathode ray tubes Expired GB670021A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB4446/49A GB670021A (en) 1949-02-18 1949-02-18 Improvements in beam centering devices for cathode ray tubes
US144688A US2597298A (en) 1949-02-18 1950-02-17 Beam centering device for cathoderay tubes
DEP4285A DE973714C (en) 1949-02-18 1950-10-03 Device for centering the electron beam of a cathode ray tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4446/49A GB670021A (en) 1949-02-18 1949-02-18 Improvements in beam centering devices for cathode ray tubes

Publications (1)

Publication Number Publication Date
GB670021A true GB670021A (en) 1952-04-09

Family

ID=9777334

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4446/49A Expired GB670021A (en) 1949-02-18 1949-02-18 Improvements in beam centering devices for cathode ray tubes

Country Status (3)

Country Link
US (1) US2597298A (en)
DE (1) DE973714C (en)
GB (1) GB670021A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE972501C (en) * 1952-08-26 1959-08-20 Philips Nv Permanent magnetic focusing device for the cathode ray tube of a television receiver
GB2128812A (en) * 1982-09-20 1984-05-02 Us Energy Permanent magnet multipole with adjustable strength

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB731451A (en) * 1952-10-23 1955-06-08 Dennis Henry Covill Improvements in or relating to arrangements for use with cathode ray tubes
US2860329A (en) * 1955-01-18 1958-11-11 Sol L Reiches Centering device for cathode ray tube and tv receiver using same
US2922908A (en) * 1955-08-31 1960-01-26 Westinghouse Electric Corp Retaining device
US2907908A (en) * 1955-09-01 1959-10-06 Philco Corp Apparatus for preventing distortion in plural beam cathode ray tubes
DE1186561B (en) * 1960-07-06 1965-02-04 Magnetfab Bonn Gmbh Ring-shaped correction magnet for cathode ray tubes and method for manufacturing the correction magnet
US3356879A (en) * 1963-08-14 1967-12-05 Zenith Radio Corp Beam positioning device for varying the effective origin of cathode-ray tube electron beam
GB1429292A (en) * 1972-03-20 1976-03-24 Rca Corp Static convergence device for electron beams
US5399933A (en) * 1993-05-20 1995-03-21 Chunghwa Picture Tubes, Ltd. Magnetic beam adjusting rings with different thickness

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR747139A (en) * 1931-11-10 1933-06-12 Devices for deflecting electronic currents in cathode ray tubes
AT135287B (en) * 1931-12-12 1933-11-10 Telefunken Gmbh Device for synchronizing cathode ray recorders.
US2188579A (en) * 1933-05-27 1940-01-30 Loewe Radio Inc Cathode ray tube, more particularly for television purposes
DE681755C (en) * 1934-02-09 1939-09-30 Loewe Opta Gmbh Arrangement for the compensation of external magnetic interference fields with cathode ray tubes
US2224933A (en) * 1934-02-09 1940-12-17 Loewe Radio Inc Magnetic distortion correcting means for cathode ray tubes
US2102421A (en) * 1934-07-12 1937-12-14 Gen Electric Cathode ray oscillograph
FR796502A (en) * 1934-10-19 1936-04-09 Fernseh Ag Magnet now the straight ray in the braun tubes
DE970708C (en) * 1934-10-19 1958-10-16 Fernseh Gmbh Arrangement for influencing electron beams in cathode ray tubes with a beam limiting diaphragm
DE701422C (en) * 1936-03-03 1941-01-16 Telefunken Gmbh Device to compensate for the deflection generated by the direct current component of an asymmetrical saw tooth current
NL48160C (en) * 1936-03-03
DE688644C (en) * 1937-05-29 1940-02-27 Aeg r coaxial partial lenses
US2456474A (en) * 1946-07-02 1948-12-14 Gen Electric Electric discharge device
US2498354A (en) * 1946-12-03 1950-02-21 Philco Corp Magnetic lens system
US2455977A (en) * 1946-12-31 1948-12-14 Philco Corp Magnetic lens for correcting scanning defects
US2513929A (en) * 1948-05-21 1950-07-04 Gen Electric Beam centering device for cathode-ray tubes
NL147275B (en) * 1948-07-01 Plessey Uk Limited ELECTRIC TORQUE SWITCH FOR PUSH-BUTTON CONTROL.
US2544898A (en) * 1949-12-31 1951-03-13 Guardian Electric Mfg Co Centering device for beams of cathode-ray tubes
US2544875A (en) * 1950-03-02 1951-03-13 Pye Ltd Combination centering, focusing, and deflecting device for beam of cathode-ray tubes
FR79502E (en) * 1957-05-30 1962-12-14 Armstrong Patents Co Ltd Improvements to vehicle suspension systems

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE972501C (en) * 1952-08-26 1959-08-20 Philips Nv Permanent magnetic focusing device for the cathode ray tube of a television receiver
GB2128812A (en) * 1982-09-20 1984-05-02 Us Energy Permanent magnet multipole with adjustable strength

Also Published As

Publication number Publication date
US2597298A (en) 1952-05-20
DE973714C (en) 1960-05-19

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