US3727159A - Magnetic convergence device for use in an in-line type color cathode ray tube - Google Patents

Magnetic convergence device for use in an in-line type color cathode ray tube Download PDF

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Publication number
US3727159A
US3727159A US00235841A US3727159DA US3727159A US 3727159 A US3727159 A US 3727159A US 00235841 A US00235841 A US 00235841A US 3727159D A US3727159D A US 3727159DA US 3727159 A US3727159 A US 3727159A
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United States
Prior art keywords
magnetic convergence
mounting plate
arcuate
units
magnetic
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Expired - Lifetime
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US00235841A
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English (en)
Inventor
S Takenaka
K Idaka
Y Sakamoto
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Toshiba Corp
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Tokyo Shibaura Electric Co Ltd
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Application filed by Tokyo Shibaura Electric Co Ltd filed Critical Tokyo Shibaura Electric Co Ltd
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    • 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

Definitions

  • MAGNETIC CONVERGENCE DEVICE F OR USE IN AN lN-LHNE TYPE COLOR CATl-lODE RAY TUBE Inventors: Shigeo Takenaka; Kazuliiko ldaka; Yuichi Sakamoto, all of Fukaya-shi, Saitama-ken, Japan Assignee: Tokyo Shibauro- Electric Co., Ltd.,
  • ABSTRACT A mounting plate having first and second arcuate slits is mounted on the neck portion of an in-line type color cathode ray tube. On both surfaces of the mounting plate are slidably disposed first and second arcuate racks and first and second magnetic convergence units each having an E-shaped convergence core, by means of screws passing through the arcuate slits. First and second pinions geared to the arcuate racks are fixed to one end of first and second shafts rotatably fitted to the mounting plate, the other end of the shafts being fixed to the first and second adjusting wheels.
  • SHEET 2 [IF 2 MAGNETIC CONVERGENCE DEVICE FOR USE IN AN IN-LINE TYPE COLOR CA'IIIODE RAY TUBE
  • This invention relates to a magnetic convergence device for use in an in-line type color cathode ray tube and more particularly to a magnetic convergence 1 device having first and second individually and mechanically adjustable magnetic convergence units.
  • the in-line type tube generally has three electron guns arranged in linear relationship, and the electron beams emitted from the guns are directed to a fluorescent screen through the neck portion of said tube maintaining the in-line arrangement of said electron guns.
  • the central beam is usually for a green color and the two side beams are for red and blue colors.
  • a dynamic convergence means and a static convergence means cooperating therewith are generally provided on the outer surface of the neck portion in connection with the red and blue color electron beams so as to electrically and magnetically adjust their directions. Further, the red and blue color electron beams should be deflected individually all over the fluorescent screen so as to obtaina good beam convergence, but none of the conventional convergence devices has succeeded in effecting proper deflection. 1
  • the above-mentioned object can beachieved by providing a magnetic convergence device for use in an in-line type color cathode ray tube comprising a nonmagnetic mounting plate having first and second arcuate slits and a plurality of split pieces being clamped by a clamping means so as to fix said mounting plate on the outer surface of the neck portion of said cathode ray tube; first and second magnetic convergence units positioned on one surface of said mounting plate; means for adjustably fitting said magnetic convergence units to permit their displacement along said arcuate slits, each of said magnetic convergence units having a nonmagnetic frame, a
  • FIG. 2 is a plan view taken along line II-II of FIG. 1;
  • FIG. 3 is a plan view taken along line Ill-III of FIG. 1; and I FIG. 4 is a plan view of another embodiment of the invention.
  • FIGS. 1 to 3 of the accompanying drawings there is disposed a disc-shaped nonmagnetic mounting plate 3 on the outer surface of a neck portion 1 of an in-line type color cathode ray tube 2.
  • the mounting plate 3 has a bore 4 provided at the center into which the neck portion 1 is inserted, and a plurality of, for example, six split pieces 5 formed integrally with the mounting plate 3 and extending from the inner surface of the bore 4.
  • a clamping means consisting of a clamping band 6 and a bolt 7 for clamping the split pieces 5 to the neck portion 1.
  • First and second arcuate slits 8 are formed in the mounting plate 3 in concentric relationship with the bore 4.
  • first and second arcuate racks 9 which have a curvature corresponding to that of the racks, 8 and a width slightly larger than that of the slits 9.
  • first and second magnetic convergence units 10 which are connected to the arcuate racks 9 by means of screws 11 passing through the arcuate slits 8.
  • Each of the magnetic convergence units 10 comprises a nonmagnetic rectangular frame 12 having a bottom plate 13 connected to the arcuate rack 9, a dynamic convergence electromagnet including an E- shaped core 14 and dynamic convergence coils 15 wound thereon, and two disc-shaped permanent magnets 16 positioned between the cross-piece of the E- shaped core 14 and frame'12. The magnets 16 are pressed against the cross-piece of the core 14 by compression coil springs 17.
  • the electron gun assembly of the in-line type color cathode ray tube 2 has three linearly arranged electron guns and consequently the emitted three electron beams 18, 19 and 20 respectively corresponding to red, green and blue colors are also linearly disposed and further separated by magnetic shield plates 21 and 22 so as to prevent interaction between the magnetic fields applied to the electron beams 18 to 20.
  • the beams, in particular the beams 18 and 20, are therefore independently adjustable and their convergence can be controlled by the magnetic convergence units 10, which create dynamic and static fluxes from the free ends of the E-shaped cores 14 for deflecting the beams 18 and 20.
  • First and second pinion 23 are geared to the arcuate racks 9.
  • Each of the pinions 23 is fixed to one end of a shaft 24 rotatably mounted on a holder 25 formed on the surface of the mounting plate 3.
  • an adjusting wheel 26 for rotating the pinion 23.
  • the peripheral portion of one surface of the adjusting wheels 26 is provided with a scale 27 for indicating the rotating position of the magnetic convergence units 10 on the mounting plate 3.
  • three electron beams 18 to 20 emitted from the linearly arranged three electron guns travel through the neck portion 1 and are deflected in the deflection device 28 mounted on .the outer surface of the funnel portion 29 of the color cathode ray tube 2 so as to convergently impinge on the fluorescent screen.
  • the red and blue beams 18 and 20 are magnetically subjected to deflection by the magnetic convergence units.
  • the magnetic convergence is achieved using a dynamic convergence flux obtained by applying an alternating current to the coils l5 and a static convergence flux obtained by adjusting the arrangement of themagnetic poles of the two discshaped permanent magnets 16.
  • the magnetic convergence is further achieved by mechanically displacing the magnetic convergence units along the arcuate slits-8 through rotation of the adjusting wheels 26.
  • the magnetic convergence units 10 are fitted to the mounting plate 3 by screws 30 passing through the slits 8.
  • the diameter of the screw head is larger than the width of the slit 8 and the diameter of the threaded portion of the screw 30 passing through the slit 8 is slightly smaller than the width of the slit 8. Therefore, when all of the I screws 30 are loosened, the magnetic convergence units 10 can be easily displaced along the arcuate slits 8 so as to precisely deflect the electron beams 18 and 20.
  • the other elements of the embodiment of FIG. 4 are operated in the same manner as those of FIG. 1 and description thereof is omitted.
  • a magnetic convergence device for use in an inline type color cathode ray tube comprising a nonmagnetic mounting plate having first and second arcuate slits anda plurality of split pieces being clamped by a clamping means so as to fix saidmou'nting plateon the outer surface of the neck portion of said cathode ray tube; first and second magnetic convergence units positioned on one surface of said mounting plate; and means for adjustably fitting said magnetic convergence units to permit their displacement along said arcuate slits, each of said magnetic convergence units having a nonmagnetic frame, a dynamic convergence electromagnet including an E-shaped core and two disc- I shaped permanent magnets associated with said electromagnet.
  • a magnetic convergence device as claimed in claim 1 wherein said means for adjustably fitting said magnetic convergence units comprise first and second arcuate racks positioned on the other surface of said mounting plate; connecting means for connecting a pair of arcuate racks to a pair ofmagnetic convergence units through said arcuate slits; first and second pinions geared to said arcuate racks and fixed to one end of first and second shafts rotatably disposed on said mounting plate; and first and second adjusting wheels fixed to the other end of said shafts.
  • a magnetic convergence device as claimed in claim 1 wherein said means for adjustably fitting said magnetic convergence units comprises a plurality of screws for fixing said magnetic convergence units to said mounting plate through said arcuate slits, the diameter of the head of the screw being largerthan the width of the arcuate slit.
US00235841A 1971-03-20 1972-03-17 Magnetic convergence device for use in an in-line type color cathode ray tube Expired - Lifetime US3727159A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1873771 1971-03-20

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US3727159A true US3727159A (en) 1973-04-10

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US00235841A Expired - Lifetime US3727159A (en) 1971-03-20 1972-03-17 Magnetic convergence device for use in an in-line type color cathode ray tube

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US (1) US3727159A (fr)
DE (1) DE2213516A1 (fr)
FR (1) FR2130380B1 (fr)
GB (1) GB1322305A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3793602A (en) * 1973-04-13 1974-02-19 Gen Electric Convergence device for short neck in-line cathode ray tube
CN105374494A (zh) * 2015-11-27 2016-03-02 高佳 一种磁吸块调节机构

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4562480A (en) * 1983-11-14 1985-12-31 Tektronix, Inc. Mounting apparatus for dynamic convergence coils

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3021445A (en) * 1959-07-24 1962-02-13 Bbc Brown Boveri & Cie Electron lens
US3305807A (en) * 1965-07-02 1967-02-21 Gen Electric Convergence apparatus with convergence members on opposite surfaces of flat members

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2591159A (en) * 1950-05-29 1952-04-01 Gilfillan Bros Inc Magnetic means for producing compensations and other effects in a cathode-ray tube

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3021445A (en) * 1959-07-24 1962-02-13 Bbc Brown Boveri & Cie Electron lens
US3305807A (en) * 1965-07-02 1967-02-21 Gen Electric Convergence apparatus with convergence members on opposite surfaces of flat members

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3793602A (en) * 1973-04-13 1974-02-19 Gen Electric Convergence device for short neck in-line cathode ray tube
CN105374494A (zh) * 2015-11-27 2016-03-02 高佳 一种磁吸块调节机构

Also Published As

Publication number Publication date
FR2130380A1 (fr) 1972-11-03
DE2213516A1 (de) 1972-09-28
FR2130380B1 (fr) 1976-03-05
GB1322305A (en) 1973-07-04

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