US3831122A - Blue lateral correction system for color television tubes - Google Patents

Blue lateral correction system for color television tubes Download PDF

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Publication number
US3831122A
US3831122A US00396445A US39644573A US3831122A US 3831122 A US3831122 A US 3831122A US 00396445 A US00396445 A US 00396445A US 39644573 A US39644573 A US 39644573A US 3831122 A US3831122 A US 3831122A
Authority
US
United States
Prior art keywords
electromagnets
correction system
gun
picture tube
neck
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 - Lifetime
Application number
US00396445A
Other languages
English (en)
Inventor
P Hanke
R Ohlhorst
H Ludcke
H Martinetz
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.)
Blaupunkt Werke GmbH
Original Assignee
Blaupunkt Werke 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 Blaupunkt Werke GmbH filed Critical Blaupunkt Werke GmbH
Application granted granted Critical
Publication of US3831122A publication Critical patent/US3831122A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/701—Systems for correcting deviation or convergence of a plurality of beams by means of magnetic fields at least
    • H01J29/702—Convergence correction arrangements therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/56—Correction of beam optics
    • H01J2229/568—Correction of beam optics using supplementary correction devices
    • H01J2229/5681—Correction of beam optics using supplementary correction devices magnetic
    • H01J2229/5687—Auxiliary coils

Definitions

  • a known form of such a correction device is constructed with three electromagnets, with one 'of the three electromagnets oriented radially towards one of the electron guns, while two others, likewise radially oriented, are disposed around the circumference of the picture tube neck on the two sides of the first electromagnet spaced therefrom by equal angles of more than 120.
  • each core rod of the electromagnets is provided with a small coil and with a large coil. The smaller coils lie closer to the picture tube neck than the larger coils and serve for dynamic correction, whereas the larger coils are provided for static correction.
  • a first and second electromagnet are disposed on the opposite sides of the picture tube, each oriented perpendicularly to the direction of the beam produced by one of the guns, which may be taken to be the one for the blue signal, and these electromagnets are connected to produce oppositely directedmagnetic fields extending inside the tube neck so as to deflect the electron beam of the blue gun in one direction and to deflect the beams of the other two guns in the opposite direction.
  • the electromagnet farthest from the beam of the blue gun isprovided with a pole strap extending around a portion of the circumference of the picture tube neck where the beams of the red and green guns are located.
  • the two electromagnets are mounted on a printed circuit plate perpendicular to the tube neck which passes through a hole in the center of the plate closely fitting the tube neck.
  • the printed circuit plate serves as a carrier for the electromagnet and is also provided with connection paths and connection elements for them.
  • the connection elements are preferably of the kind with which an edge contact connector is connectible.
  • First and second electromagnets 2 and 3 are mounted on the printed circuit plate 1.
  • the electromagnets each consist of a core 4,5, a smaller coil 6,7 and a larger coil 8,9.
  • the electromagnets 2,3 are oriented perpendicularly to a cut-out 10 in the printed circuit plate 1, and disposed so that the smaller coils 6,7 are nearer to the cut-out 10 than the larger coils 8,9.
  • the cut-out 10 is a circular aperture closely fitting around the surface of the color television tube neck 11, on which the printed circuit plate is mounted to serve as the carrier for the electromagnets 2,3.
  • the electromagnets 2,3 are so disposed on the printed circuit plate that the first electromagnet 2 is perpendicular to the beam direction of the blue gun 12, whereas the second electromagnet 3 is provided with a pole strap 13 that surrounds a portion of the picture tube neck within which the beams of the red gun l4 and the green gun 15 are. located. in the drawing the configuration of the field of the electromagnets 2 and 3 is schematically indicated by dashed lines.
  • the smaller coils 6,7 serve provide dynamic correction, and the larger coils 8,9 provide static correction of the covergence error.
  • the extent of the circumferential width of the pole strap 13 influences the course of the lines of force of the field, and this width can easily be made such that when the field is modified by operation of the first electromagnet 2 deflecting the beam of the blue gun 12, no reaction on the deflection of the electron beams of the red and green guns l4 and 15 arises.
  • connection paths l6 and 17 and connection elements 18 and 19 (for coils 8 and 9 and for coils 6 and 7, respectively) the connection elements 18 and 19 being, for example, contacts for gripping connections with a plug (not shown), so that hand wiring of the assembly is not necessary.
  • first and second electromagnets (2,3) not more than two of them inall, disposed on the outside of said picture tube neck (11) opposite each other and oriented perpendicularly to the direction of the beam produced by said first gun (12), said first electromagnet being the nearer to the beam produced by said first gun, said electromagnets being connected to produce oppositely directed magnetic fields extending inside said neck so as to deflect the electron beam proplate (1) serving as a carrier therefor an provided with an aperture (10) corresponding to the external diameter of said picture tube neck (11), and in which, further, said printed circuit plate (1) is provided with connection paths and connection elements for said electromagnets.
  • connection elements are such that edge contact connectors are connectible therewith.

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  • Video Image Reproduction Devices For Color Tv Systems (AREA)
US00396445A 1972-09-13 1973-09-12 Blue lateral correction system for color television tubes Expired - Lifetime US3831122A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2244797A DE2244797A1 (de) 1972-09-13 1972-09-13 Blaulateral-system

Publications (1)

Publication Number Publication Date
US3831122A true US3831122A (en) 1974-08-20

Family

ID=5856159

Family Applications (1)

Application Number Title Priority Date Filing Date
US00396445A Expired - Lifetime US3831122A (en) 1972-09-13 1973-09-12 Blue lateral correction system for color television tubes

Country Status (7)

Country Link
US (1) US3831122A (cs)
JP (1) JPS4966232A (cs)
BR (1) BR7307034D0 (cs)
DE (1) DE2244797A1 (cs)
FR (1) FR2199238B3 (cs)
IT (1) IT994233B (cs)
ZA (1) ZA737260B (cs)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0002571A1 (en) * 1977-12-09 1979-06-27 International Business Machines Corporation Electromagnetic lateral convergence assembly for cathode ray tube

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3555473A (en) * 1969-07-07 1971-01-12 Zenith Radio Corp Convergence apparatus
US3611221A (en) * 1969-08-15 1971-10-05 Denki Onkyo Co Ltd Convergence yoke apparatus for color television receiver
US3657675A (en) * 1970-07-16 1972-04-18 Tracor Convergence units for color television picture tubes
US3717788A (en) * 1969-05-14 1973-02-20 Rank Organisation Ltd Cathode ray tube arrangement utilizing magnetic shunts for controlling color registration

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717788A (en) * 1969-05-14 1973-02-20 Rank Organisation Ltd Cathode ray tube arrangement utilizing magnetic shunts for controlling color registration
US3555473A (en) * 1969-07-07 1971-01-12 Zenith Radio Corp Convergence apparatus
US3611221A (en) * 1969-08-15 1971-10-05 Denki Onkyo Co Ltd Convergence yoke apparatus for color television receiver
US3657675A (en) * 1970-07-16 1972-04-18 Tracor Convergence units for color television picture tubes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0002571A1 (en) * 1977-12-09 1979-06-27 International Business Machines Corporation Electromagnetic lateral convergence assembly for cathode ray tube
US4214221A (en) * 1977-12-09 1980-07-22 International Business Machines Corporation Convergence assembly for cathode ray tube

Also Published As

Publication number Publication date
ZA737260B (en) 1974-08-28
BR7307034D0 (pt) 1974-07-11
DE2244797A1 (de) 1974-03-21
FR2199238B3 (cs) 1975-06-20
FR2199238A1 (cs) 1974-04-05
IT994233B (it) 1975-10-20
JPS4966232A (cs) 1974-06-27

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