US3191104A - Deflection system for television receivers - Google Patents

Deflection system for television receivers Download PDF

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Publication number
US3191104A
US3191104A US153811A US15381161A US3191104A US 3191104 A US3191104 A US 3191104A US 153811 A US153811 A US 153811A US 15381161 A US15381161 A US 15381161A US 3191104 A US3191104 A US 3191104A
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United States
Prior art keywords
annular
hood
deflection coil
magnets
television receivers
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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
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US153811A
Inventor
Mak Gerrit
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US Philips Corp
North American Philips Co Inc
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US Philips Corp
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Publication date
Priority claimed from AU66677/60A external-priority patent/AU248983B2/en
Application filed by US Philips Corp filed Critical US Philips Corp
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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
    • 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
    • H01J29/82—Mounting, supporting, spacing, or insulating electron-optical or ion-optical arrangements
    • H01J29/823—Mounting, supporting, spacing, or insulating electron-optical or ion-optical arrangements around the neck of the tube
    • H01J29/826—Deflection arrangements

Definitions

  • the cap at least partly from molding material including permanently magnetizable material. Certain parts of the cap may be magnetized by means of a suitable electro-magnet and are thus capable of fulfilling the function of correction magnets.
  • FIG. 1 shows a deflection coil system in a perspective view from the rear of known construction, in which the invention can be carried out;
  • FIG. 2 shows the deflection coil system of the invention.
  • FIG. 1 show an essentially truncated-coneshaped, hood of synthetic resin open at both ends, in which a deflection coil system of known structure (for the sake of clarity this is not shown) for the deflection of the electron beam in a television display tube is arranged.
  • the front end of the hood 1 Le. the end facing the image screen of the display tube (not shown) from behind has arranged in its neighborhood a number of rod-shaped correction magnets 3 and two cylindrical, rotatable magnets 7, provided with pole shoes 5.
  • one or more of these magnets may be replaced by annular zone 9 near the edge of the hood 1, in which zone the hood is made "ice of molded material which contains permanent-magnetizable material i.e. particles having a high coercive force, for example ceramic material such as barium ferrite, preferably in the form of a powdery filler.
  • Discrete parts of this annulus can be magnetized by means of a suitable electro-magnet by arranging the poles thereof on the said zone and passing through the magnet a strong current pulse. The parts thus magnetized can fulfill the function of correction magnets.
  • the location of the magnetized zones as shown in FIG.
  • the magnetizations may be erased and be replaced by magnetizations at other places and so on, until the desired correction of the raster appearing on the display tube is obtained. Owing to the possibility of varying the magnetization of the annulus 9 no magnets need be employed which have to be fastened to the screening hood 1 so as to be mechanically adjustable, so that the structure may be made inexpensively.
  • a screening hood of insulating molding material comprising a generally truncated conical portion for housing deflection coils and an annular marginal portion, said annular marginal portion having a dispersion of permanent magnetizable powder of high coercive force whereby discrete areas of said annular portion may be permanently magnetized for image correction,
  • a deflection coil system for television display tubes a screening hood of insulating molding material, said screennig hood comprising a generally truncated conical portion for housing a deflection coil and an annular marginal portion, said annular marginal portion containing a filler of powdered permanently magnetizable material of barium ferrite whereby discrete areas of said annular portion may be permanently magnetized for image correction.

Description

June 22, 1965 MAK EFLECTION SYSTEM FOR TELEVISION RECEIVERS Filed Nov. 21, 1961 PRIOR ART FIG. 2
INVENTOR GERRIT MAK AGENT United States Patent 3,191,104 DEFLE-CTION SYSTEM FOR TELEVISION RECEIVERS Gerrit Mair, Fliuders Park, South Australia, Australia, assignor to North American Philips Company, Inc., New York, N.Y., a corporation of Delaware Filed Nov. 21, 1961, Ser. No. 153,811 Claims priority, application Australia, Nov. 1, 1961, 66,677/ 60 2 Claims. (Cl. 317-200) The invention relates to a deflection coil system for use in television display tubes comprising a screening cap, surrounding the coils, and made of insulating molding material, supporting permanent magnets for image correction.
In known devices of the kind set forth use may be made of rod-shaped correction magnets, which are fastened onto the screening cap in such way that the position of a magnet with respect to the deflection coil system may be adjusted. The invention has for its object to provide a device of the kind referred to above, in which no separate magnets to be adjustably fastened to the cap are needed, so that it may be inexpensive.
In accordance with the invention this is achieved by making the cap at least partly from molding material including permanently magnetizable material. Certain parts of the cap may be magnetized by means of a suitable electro-magnet and are thus capable of fulfilling the function of correction magnets.
The invention will be described more fully with reference to the accompanying drawing in which:
FIG. 1 shows a deflection coil system in a perspective view from the rear of known construction, in which the invention can be carried out;
FIG. 2 shows the deflection coil system of the invention.
The drawings show an essentially truncated-coneshaped, hood of synthetic resin open at both ends, in which a deflection coil system of known structure (for the sake of clarity this is not shown) for the deflection of the electron beam in a television display tube is arranged. In the known device of FIG. 1 the front end of the hood 1, Le. the end facing the image screen of the display tube (not shown) from behind has arranged in its neighborhood a number of rod-shaped correction magnets 3 and two cylindrical, rotatable magnets 7, provided with pole shoes 5. In accordance with the invention one or more of these magnets may be replaced by annular zone 9 near the edge of the hood 1, in which zone the hood is made "ice of molded material which contains permanent-magnetizable material i.e. particles having a high coercive force, for example ceramic material such as barium ferrite, preferably in the form of a powdery filler. Discrete parts of this annulus, the location of which approximately correspond to those of some of the magnets 3, can be magnetized by means of a suitable electro-magnet by arranging the poles thereof on the said zone and passing through the magnet a strong current pulse. The parts thus magnetized can fulfill the function of correction magnets. The location of the magnetized zones as shown in FIG. 2 may be determined experimentally by observing their correcting effect on the image; if necessary, the magnetizations may be erased and be replaced by magnetizations at other places and so on, until the desired correction of the raster appearing on the display tube is obtained. Owing to the possibility of varying the magnetization of the annulus 9 no magnets need be employed which have to be fastened to the screening hood 1 so as to be mechanically adjustable, so that the structure may be made inexpensively.
What is claimed is:
1. In a deflection coil system for television display tubes, a screening hood of insulating molding material, said screening hood comprising a generally truncated conical portion for housing deflection coils and an annular marginal portion, said annular marginal portion having a dispersion of permanent magnetizable powder of high coercive force whereby discrete areas of said annular portion may be permanently magnetized for image correction,
2. A deflection coil system for television display tubes, a screening hood of insulating molding material, said screennig hood comprising a generally truncated conical portion for housing a deflection coil and an annular marginal portion, said annular marginal portion containing a filler of powdered permanently magnetizable material of barium ferrite whereby discrete areas of said annular portion may be permanently magnetized for image correction.
References Cited by the Examiner UNITED STATES PATENTS LARAMIE E. ASKIN, Primary Examiner.

Claims (1)

1. IN A DEFLECTION COIL SYSTEM FOR TELEVISION DISPLAY TUBES, A SCREENING HOOD OF INSULATING MOLDING MATERIAL, SAID SCREENING HOOD COMPRISING A GENERALLY TRUNCATED CONICAL PORTION FOR HOUSING DEFLECTION COILS AND AN ANNULAR MARGINAL PORTION, SAID ANNULAR MARGINAL PORTION HAVING A DISPERSION OF PERMANENT MAGNETIZABLE POWDER OF HIGH COERCIVE FORCE WHEREBY DISCRETE AREAS OF SAID ANNULAR PORTION MAY BE PERMANENTLY MAGNETIZED FOR IMAGE CORRECTION.
US153811A 1960-11-17 1961-11-21 Deflection system for television receivers Expired - Lifetime US3191104A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU66677/60A AU248983B2 (en) 1960-11-17 Method and means for correcting raster distortion ina cathode ray tube
AU6667761 1961-11-01

Publications (1)

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US3191104A true US3191104A (en) 1965-06-22

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US153811A Expired - Lifetime US3191104A (en) 1960-11-17 1961-11-21 Deflection system for television receivers

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DE (1) DE1191496B (en)
GB (1) GB927025A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1292176B (en) * 1968-01-25 1969-04-10 Gerhard Walter Coil system for the deflection of electron beams in color television tubes
US3516038A (en) * 1967-05-22 1970-06-02 Matsushita Electric Ind Co Ltd Convergence device
US3857057A (en) * 1971-12-22 1974-12-24 Philips Corp Colour television display apparatus provided with a picture display tube with electron beams generated in one plane
US4105983A (en) * 1975-04-01 1978-08-08 U.S. Philips Corporation Static convergence unit, and a color display tube comprising a convergence unit having permanent magnets
DE2832668A1 (en) * 1977-07-26 1979-02-08 Rca Corp METHOD AND DEVICE FOR ADJUSTING THE COLOR UNIT OF AN IN-LINE COLOR TV TUBE
US4490703A (en) * 1982-07-28 1984-12-25 Ball Corporation Multipole magnet for electron beam correction
FR2552263A1 (en) * 1983-09-21 1985-03-22 Philips Nv ELECTROMAGNETIC DEVIATION UNIT AND COLOR TUBE PROVIDED WITH SUCH A DEVIATION UNIT
US5550522A (en) * 1993-11-09 1996-08-27 U.S. Phillips Corporation Deflection unit having a ring with field correction elements, and cathode ray tube provided with said unit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1269694A (en) * 1985-07-31 1990-05-29 Paul Michael Bruey Deflection distortion correction device
US4823100A (en) * 1985-07-31 1989-04-18 Rca Licensing Corporation Deflection distortion correction device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2717232A (en) * 1950-05-13 1955-09-06 Ruetgerswerke Ag Dehydration and fractionation of crude pyridine
FR1239287A (en) * 1958-10-31 1960-08-19 Philips Nv Television Picture Tube Deflection Coil System
US2963609A (en) * 1957-11-20 1960-12-06 Philco Corp Beam centering and deflection correction means for cathode ray tubes

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1774923U (en) * 1958-07-04 1958-10-02 Hermann Holtz MAGNETIC ADHESIVE MARKER.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2717232A (en) * 1950-05-13 1955-09-06 Ruetgerswerke Ag Dehydration and fractionation of crude pyridine
US2963609A (en) * 1957-11-20 1960-12-06 Philco Corp Beam centering and deflection correction means for cathode ray tubes
FR1239287A (en) * 1958-10-31 1960-08-19 Philips Nv Television Picture Tube Deflection Coil System

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3516038A (en) * 1967-05-22 1970-06-02 Matsushita Electric Ind Co Ltd Convergence device
DE1292176B (en) * 1968-01-25 1969-04-10 Gerhard Walter Coil system for the deflection of electron beams in color television tubes
US3857057A (en) * 1971-12-22 1974-12-24 Philips Corp Colour television display apparatus provided with a picture display tube with electron beams generated in one plane
US4105983A (en) * 1975-04-01 1978-08-08 U.S. Philips Corporation Static convergence unit, and a color display tube comprising a convergence unit having permanent magnets
DE2832668A1 (en) * 1977-07-26 1979-02-08 Rca Corp METHOD AND DEVICE FOR ADJUSTING THE COLOR UNIT OF AN IN-LINE COLOR TV TUBE
US4490703A (en) * 1982-07-28 1984-12-25 Ball Corporation Multipole magnet for electron beam correction
FR2552263A1 (en) * 1983-09-21 1985-03-22 Philips Nv ELECTROMAGNETIC DEVIATION UNIT AND COLOR TUBE PROVIDED WITH SUCH A DEVIATION UNIT
DE3433378A1 (en) * 1983-09-21 1985-04-11 N.V. Philips' Gloeilampenfabrieken, Eindhoven ELECTROMAGNETIC DEFLECTING UNIT AND COLOR TV TUBE WITH SUCH A DIFFERENTIATING UNIT
GB2147143A (en) * 1983-09-21 1985-05-01 Philips Nv Electromagnetic deflection unit for a colour display tube
US4535313A (en) * 1983-09-21 1985-08-13 U.S. Philips Corporation Electromagnetic deflection unit and color display tube provided with such a unit
US5550522A (en) * 1993-11-09 1996-08-27 U.S. Phillips Corporation Deflection unit having a ring with field correction elements, and cathode ray tube provided with said unit

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Publication number Publication date
GB927025A (en) 1963-05-22
DE1191496B (en) 1965-04-22

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