EP0302995B1 - Magnetic shunt for deflection yokes - Google Patents

Magnetic shunt for deflection yokes Download PDF

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Publication number
EP0302995B1
EP0302995B1 EP88105077A EP88105077A EP0302995B1 EP 0302995 B1 EP0302995 B1 EP 0302995B1 EP 88105077 A EP88105077 A EP 88105077A EP 88105077 A EP88105077 A EP 88105077A EP 0302995 B1 EP0302995 B1 EP 0302995B1
Authority
EP
European Patent Office
Prior art keywords
ring
screen
field
coil
curve
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
EP88105077A
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German (de)
English (en)
French (fr)
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EP0302995A1 (en
Inventor
Joseph Francis Hevesi
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.)
International Business Machines Corp
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International Business Machines Corp
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Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of EP0302995A1 publication Critical patent/EP0302995A1/en
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Publication of EP0302995B1 publication Critical patent/EP0302995B1/en
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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
    • 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
    • H01J29/003—Arrangements for eliminating unwanted electromagnetic effects, e.g. demagnetisation arrangements, shielding coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/0007—Elimination of unwanted or stray electromagnetic effects
    • H01J2229/0015—Preventing or cancelling fields leaving the enclosure

Definitions

  • the present invention relates to display apparatus, and more particularly relates to apparatus for reducing unwanted magnetic radiation external to a cathode ray tube display device, in front of the screen thereof.
  • CRTs Cathode Ray Tubes
  • CTRs Cathode Ray Tubes
  • yokes In addition to manifesting itself within the CRT, for beam deflection, this magnetic field also extends outside of the CRT, and even in front of the screen. This external magnetic field serves no useful purpose and an effort is frequently made to reduce this part of the yoke magnetic field.
  • the present invention relates to a cathode ray tube apparatus comprising a viewing screen, means for producing a charged particle beam directed at the screen from the rear thereof, a saddle deflection coil disposed behind the screen generating a magnetic field for deflecting the beam across the screen and generating unwanted magnetic radiation which extends in front of the viewing screen, and means for reducing the unwanted magnetic radiation in front of the viewing screen.
  • the apparatus is characterised in that the means for reducing the unwanted magnetic radiation in front of the viewing screen comprises magnetic shunt means disposed between the coil and the screen and including a ring of magnetically permeable material positioned near or against the end turns of the coil and disposed around the cathode ray tube.
  • the present invention finds application in a cathode ray apparatus including a cathode ray tube ("CRT") having a screen for viewing and having a charged particle beam directed at the screen from the rear thereof and aligned with the central axis of the tube, but that may be magnetically deflected from the axis, and having a deflection coil producing a magnetic component from axially aligned wire segments and a magnetic component from circumferentially aligned wire segments relative to the axis, giving rise to a net distributed magnetic field in front of the coil.
  • CTR cathode ray tube
  • the apparatus reduces the net distributed magnetic radiation in front of the coil through the provision of a magnetic shunt disposed between the coil and the screen, wherein the magnetic shunt comprises a magnetically permeable material having its configuration and position relative to the coil selected to minimise the net distributed magnetic field in front of the coil.
  • the invention may be embodied in forms which are made of relatively inexpensive linear ferrite materials configured in shapes that are inexpensive to provide, such as a flat ring or the like. As such, it permits a relatively inexpensive solution to the problem.
  • the present invention has demonstrated dramatic reductions in the unwanted radiation in front of CRTs to which it has been applied.
  • Fig. 1 is a diagram showing pertinent portions of an integrated yoke tube component.
  • Fig. 2 is a simplified diagram of one winding each from the upper and lower deflection coils of the integrated yoke tube component shown in Fig. 1.
  • Fig. 3 is a plot showing the magnetic field intensity along the Z axis for a typical deflection yoke such as is shown in Fig. 1.
  • Fig. 4 is a figure like that of Fig. 1, having added thereto a ring 50 in accordance with the preferred embodiment of the present invention.
  • Fig. 5 is a diagram like that of Fig. 2, having added thereto a ring 50 in accordance with the preferred embodiment of the present invention.
  • Fig. 6 is a plot showing the effective mu vs. actual mu for the ring depicted in Figs. 4 and 5.
  • Fig. 7 is a set of curves, on the same set of axes as in Fig. 3, showing the effect on the net field A of ring 50.
  • Fig. 8 is a set of curves showing the effect of ring 50 on the end turn field shown in Fig. 3.
  • Fig.9 is an expanded view of the portion of the curve shown in Fig. 7 beyond approximately 2.5 centimeters.
  • Fig. 10 is a plot like that of Fig. 9, wherein ring 50 is a slightly different distance from the yoke.
  • Fig. 11 is a diagram like Fig. 9, in which the inner diameter radius of ring 50 is slightly different from that of Fig. 9.
  • Fig. 12 is a curve like that of Fig. 9 but wherein the distance of the ring 50 from the end of the yoke is different from that of Fig. 9 and Fig. 10.
  • Fig. 13 is a diagram of a further embodiment, which includes a lip portion 62.
  • Fig. 14 shows a still further embodiment in which a ring is provided having two portions.
  • Fig. 15 shows a still further embodiment made by injection molding techniques of a material such as nylon impregnated with ferrite particles.
  • Fig. 16 is a cross-sectional diagram through a portion of a still further embodiment of ring, made with conventional mu metal laminates.
  • Fig. 17 shows a further embodiment, having a hexagonal shape.
  • Fig. 1 shows the pertinent portions of an integrated yoke tube component (“ITC") 10 which includes a CRT 12, having a front screen 14, and upper and lower horizontal deflection coils 16, 18.
  • the deflection coils 16, 18 generate a varying magnetic field between them, inside CRT 12, to deflect the electron beam within the tube 12 for horizontal sweeping across the face of the screen 14, as is well known in the art.
  • Fig. 2 is a simplified diagram of one winding each from the upper and lower deflection coils 16, 18, of Fig. 1.
  • loop 20 is a single loop from coil 16
  • loop 22 is a single loop from coil 18.
  • a current i flows through each of the coils so as to generate the above described varying magnetic field for horizontal deflection of the electron beam.
  • the useful portion of the loops 20, 22 are the axially aligned portions thereof 24, 26, 28, 30, which produce the main deflection field.
  • the circumferentially aligned portions of the loop (end turns) 32, 34, 36, 38 serve only to complete the circuit of each of the respective loops 20, 22, and are otherwise unnecessary for the operation of the deflection coils 16, 18.
  • These circumferentially aligned coil portions 32, 34, 36, 38 contribute the major portion of the residual distributed magnetic field that extends a significant distance in front of the screen 14 (Fig. 1) which is to be reduced.
  • the residual field is the vector sum of the main deflection field and the end turn field.
  • the resulting sum will follow the polarity of the end turn field, since the end turn component is the larger, and both decay at the same rate with distance.
  • X, Y, and Z axes are depicted, having their origin in the plane of circumferential coil portions 34, 38 and centrally located between them.
  • the Z axis coincides with the central axis of CRT 12 (Fig. 1). Note that the upper and lower halves 20, 22 are symmetrical about the x-z and y-z planes.
  • the upper and lower loops 20, 22 are interconnected to produce a dipole field on the Z axis, as is known.
  • the B field is given by: where J is the current, R is the direction and R is the distance to a point of interest T on the Z axis.
  • FIG. 3 A plot of the B field distribution of a typical horizontal deflection coil, such as is shown in Fig. 1, shielded with high permeability material, like ferrite, is shown in Fig. 3.
  • the actual B field is a directional field, and the plot shown in Fig. 3 shows only the magnitude, or intensity, of such magnetic field along the Z axis.
  • the units depicted on the horizontal axis are centimeters, while the units in the vertical axis are gauss.
  • the curve reflects a typical coil having current flowing so as to produce a field which deflects a 20 kilovolt electron beam to an angle of about 40 degrees.
  • Curves A, B, and C of Fig. 3 represent the total field, the partial field from the axial wires and the partial field from the end turns, respectively.
  • Curve A is the magnitude of the vector sum of the fields represented by curves B and C.
  • the field can be in range of approximately 1,000 - 2,000 nano-Tesla.
  • this field can be reduced to an even smaller quantity. In actual experiments using the preferred embodiment described below, reductions to below 200 nano-tesla at 55 centimeters was measured.
  • Fig. 4 shows the ITC 10 of Fig. 1 having added thereto a ring 50 of linear ferrite operating as a magnetic shunt, in accordance with the preferred embodiment of the present invention.
  • Fig. 5 shows the loops 20, 22 of Fig. 2, with the ferrite ring 50 disposed in front of it, to illustrate the relative shape and position of ring 50.
  • Ring 50 is a linear ferrite.
  • Linear ferrite is a well known material commonly used in transformer and yoke production.
  • the ring 50 has a relatively high magnetic permeability, or mu. It also has a high volume resistivity, or rho, for example 1 Meg Ohm or more per cubic centimeter The high rho value keeps eddy currents at a minimum.
  • a value of 1,000 represents a point such as point 52 for a linear ferrite ring having dimensions typical for the application described herein. If a mu value of, for example, 10 were selected, it would be in the sloping area 53 of the curve shown in Fig. 6.
  • Such a material would be highly susceptible to variations in manufacturing tolerances, temperature of operation, and the like, and would therefore provide erratic performance depending upon the variation of these factors.
  • the permeability By selecting the permeability to be in the flat, horizontal area of the curve of Fig. 6, the above described undesirable variations in performance are substantially avoided.
  • the material cost considerations will tend to keep the permeability of the material low within the range of acceptable permeability for providing this preferred stability.
  • Fig. 7 is a set of curves, on the same set of axes as these of Fig. 3, showing the effect on the net field A shown in Fig. 3 of a flat ring, such as ring 50 in Fig. 4, in accordance with the preferred embodiment of the present invention.
  • Curve A in Fig. 7 is the same as curve A in Fig. 3.
  • Curve D in Fig. 7 represents the field contribution from the magnetization effect of the ring 50, while curve E represents the resultant curve from the combination of curves A and D.
  • Fig. 8 a set of curves is shown in Fig. 8 including curve D, the magnetic field from the ring, and two other curves which help in this understanding.
  • Curve C is the same curve C as is shown in Fig. 3.
  • Curve F is a curve representing the resultant field from the combination of curves D and C. Note that in Fig. 8 the horizontal axis is the same as that of curves 3 and 7 while the vertical field has been expanded, to aid in clarity.
  • curve D is the theoretical field of the ring alone. This is an intrinsic field which is created by the magnetisation force of the end turn field. It should be noted that the presence of the ring attenuates the end turn field. The degree of attenuation is controlled by the variables such as ring dimensions and ring yoke separation, as is discussed in more detail below. It should be further noted that the end turn field combines with the main deflection field, and the area in front of the CRT screen, to form the net measurable residual field whose reduction is an object of this invention. At optimum attenuation, the modified end turn field F is equal in magnitude but opposite in direction to the main deflection field, resulting in a zero vector sum. As a practical matter, the net measurable residual field in front of the CRT screen can never be reduced to zero. However, by application of the principles of the present invention as disclosed herein, this field can be reduced to very small levels.
  • Fig. 7 The portion of Fig. 7 beyond approximately 2.5 centimeters to the right thereof is shown in Fig. 9. In order to see clearly the curve behaviour in that region, the scale is expanded in the vertical direction as compared with Fig. 7. Curves A and E are as described in Fig. 7. Curve D is not shown in this figure in the interest of providing more clarity for curves A and E. Note that Curve E is very nearly at a zero field magnitude at approximately 9.5 centimeters.
  • the compensated curve E for a typical CRT-yoke configuration is shown, where the ring 50 is of ferrite with a permeability of 1,000 -3,000, and a rho of 1 meg ohm per cubic centimeter or more, and having an inner dimension of 4 centimeters, a thickness of .2 centimeters, a width of 1 centimeter, placed at a distance of .4 centimeters from the end of the yoke.
  • the width of the ring refers to its radial extent from inner diameter to outer diameter.
  • Figs. 10-12 are plots like the plot shown in Fig. 9, for slightly different ring configurations from the configuration producing the curves of Fig. 9.
  • all of the parameters for the ring are the same as those corresponding to Fig. 9, except the distance of the ring from the end of the yoke.
  • the curves correspond to a configuration in which this dimension is .3 centimeters. It will be appreciated that this reveals over-compensation, as the curve E′ is slightly farther from the horizontal axis, for example at 9.5 centimeters.
  • Fig. 11 The curves of Fig. 11 are for a configuration in which the dimensions are the same as those corresponding to Fig. 9, but wherein the inner diameter radius is 5 centimeters, instead of 4 centimeters. It can be seen that significantly less compensation is provided, as curve E ⁇ is here below the horizontal axis, and by an amount greater than curve E is above the horizontal axis, at 9.5 centimeters.
  • Fig. 12 shows a curve for a configuration wherein the dimensions are as in Fig. 9, but wherein the distance of the ring from the end of the yoke is .6 centimeters, instead of .4 centimeters. It can be seen that slightly less compensation is provided, causing curve E′′′ to cross the horizontal axis at 9.5 centimeters. This was deemed to represent optimum compensation.
  • a ferrite ring of ordinary linear ferrite was provided, having a mu of approximately 1,000 - 3,000 and a rho of greater than 1 meg ohm per cc, ring dimensions of: an inner dimension of 111 mm (4-3/8"), a width of 9 mm (3/8"), and a thickness of 3 mm (1/8").
  • This ring was found to produce excellent cancellation effects when it was placed against the circumferential wire portions of the yoke provided with this ITC with spacing resulting only from the insulation of the yoke wires.
  • a ring having a lip portion 62 may be employed to advantage, the lip 62 being believed to serve to enhance the cancellation of the undesired field.
  • the additional machining required to make the configuration shown in Fig. 13 results in a more costly article than ring 50.
  • FIG. 14 Another alternative configuration is that of a ring formed from two portions, such as is shown in Fig. 14.
  • a ring configuration having a cross section such as is shown in Fig. 15 is also possible. It is believed that this configuration also provides beneficial cancellation field shaping characteristics. However, it also represents a more costly article than a simple flat ferrite ring such as described above.
  • Fig. 17 shows a hexagonally shaped ring, representing a still further embodiment for use with, for example, a hexagonally configured yoke.
  • embodiments may be made with conventional mu metal laminates, yielding rings having a cross-section as shown in Fig. 16.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Soft Magnetic Materials (AREA)
  • Details Of Television Scanning (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
EP88105077A 1987-08-13 1988-03-29 Magnetic shunt for deflection yokes Expired - Lifetime EP0302995B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US8494987A 1987-08-13 1987-08-13
US84949 1987-08-13

Publications (2)

Publication Number Publication Date
EP0302995A1 EP0302995A1 (en) 1989-02-15
EP0302995B1 true EP0302995B1 (en) 1994-06-08

Family

ID=22188219

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Application Number Title Priority Date Filing Date
EP88105077A Expired - Lifetime EP0302995B1 (en) 1987-08-13 1988-03-29 Magnetic shunt for deflection yokes

Country Status (14)

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EP (1) EP0302995B1 (pt)
JP (1) JP2645572B2 (pt)
KR (1) KR930000388B1 (pt)
CN (1) CN1021172C (pt)
AU (1) AU600158B2 (pt)
BR (1) BR8802943A (pt)
CA (1) CA1306281C (pt)
DE (1) DE3889997T2 (pt)
GB (1) GB2208034A (pt)
HK (1) HK119794A (pt)
IE (1) IE63796B1 (pt)
IN (1) IN175123B (pt)
MX (1) MX169727B (pt)
NZ (1) NZ225468A (pt)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MY107095A (en) * 1989-03-13 1995-09-30 Ibm Magnetic shunt for defletion yokes.
CN1040934C (zh) * 1991-07-18 1998-11-25 东芝株式会社 阴极射线管图像显示装置
KR950011706B1 (ko) * 1992-11-10 1995-10-07 삼성전관주식회사 투사형 수상관용 편향요크 및 포커스 마그네트의 고정구조

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0220777A1 (en) * 1985-10-25 1987-05-06 Koninklijke Philips Electronics N.V. Picture display device with interference suppression means

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Publication number Priority date Publication date Assignee Title
GB743426A (en) * 1953-04-29 1956-01-18 Gen Electric Co Ltd Improvements in or relating to arrangements including cathode ray tubes
NL262281A (pt) * 1960-03-17
US3576395A (en) * 1969-05-21 1971-04-27 Sylvania Electric Prod Integral support and magentic shielding means for cathode-ray
JPS50114230U (pt) * 1974-02-28 1975-09-18
NL7609374A (nl) * 1976-08-24 1978-02-28 Philips Nv Inrichting voor het weergeven van televisie- beelden, afbuigspoelenstelsel voor een derge- lijke inrichting en beeldbuis voorzien van een dergelijk afbuigspoelenstelsel.
DE3162156D1 (en) * 1980-04-17 1984-03-15 Tokyo Shibaura Electric Co Color picture tube provided with an inner magnetic shield
US4547697A (en) * 1983-07-22 1985-10-15 North American Philips Consumer Electronics Corp. CRT Shunt retaining means
JPS60253135A (ja) * 1984-05-28 1985-12-13 Mitsubishi Electric Corp デイスプレイ装置
JPS60189947U (ja) * 1984-05-28 1985-12-16 三菱電機株式会社 電磁偏向ヨ−ク
DK29385A (da) * 1984-10-09 1986-04-10 Viggo Berthelsen Fremgangsmaade og indretning til eliminering af paavirkningen fra et magnetfelt og til beskyttelse mod samme
DE3439808A1 (de) * 1984-10-31 1986-04-30 Standard Elektrik Lorenz Ag, 7000 Stuttgart Ablenksystem fuer farbbildroehren
GB2177539B (en) * 1985-05-20 1989-07-05 Mitsubishi Electric Corp Magnetic shielding system in color television receiver
DE3704648C3 (de) * 1986-02-17 1997-09-18 Murata Manufacturing Co Ablenkjocheinheit mit Hilfsspulen zur Verringerung unerwünschter Abstrahlung
JP2611196B2 (ja) * 1986-02-20 1997-05-21 日本ビクター株式会社 Ｃｒｔ画像表示装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0220777A1 (en) * 1985-10-25 1987-05-06 Koninklijke Philips Electronics N.V. Picture display device with interference suppression means

Also Published As

Publication number Publication date
GB2208034A (en) 1989-02-15
EP0302995A1 (en) 1989-02-15
HK119794A (en) 1994-11-11
GB8807138D0 (en) 1988-04-27
JPS6445046A (en) 1989-02-17
IE63796B1 (en) 1995-06-14
CN1021172C (zh) 1993-06-09
CA1306281C (en) 1992-08-11
KR890004381A (ko) 1989-04-21
BR8802943A (pt) 1989-02-21
KR930000388B1 (ko) 1993-01-16
NZ225468A (en) 1990-11-27
AU600158B2 (en) 1990-08-02
MX169727B (es) 1993-07-21
IN175123B (pt) 1995-04-22
AU2055588A (en) 1989-02-16
CN1031297A (zh) 1989-02-22
IE882459L (en) 1989-02-13
DE3889997D1 (de) 1994-07-14
DE3889997T2 (de) 1994-12-01
JP2645572B2 (ja) 1997-08-25

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