US3671897A - Asymmetrical-wound toroid yoke cathode ray tube deflection system - Google Patents

Asymmetrical-wound toroid yoke cathode ray tube deflection system Download PDF

Info

Publication number
US3671897A
US3671897A US160865A US3671897DA US3671897A US 3671897 A US3671897 A US 3671897A US 160865 A US160865 A US 160865A US 3671897D A US3671897D A US 3671897DA US 3671897 A US3671897 A US 3671897A
Authority
US
United States
Prior art keywords
deflection
vertical
horizontal axis
horizontal
cathode ray
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
US160865A
Other languages
English (en)
Inventor
Charles Edward Torsch
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.)
GTE Sylvania Inc
Original Assignee
GTE Sylvania Inc
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 GTE Sylvania Inc filed Critical GTE Sylvania Inc
Application granted granted Critical
Publication of US3671897A publication Critical patent/US3671897A/en
Assigned to NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP. reassignment NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP. ASSIGNS ITS ENTIRE RIGHT TITLE AND INTEREST, UNDER SAID PATENTS AND APPLICATIONS, SUBJECT TO CONDITIONS AND LICENSES EXISTING AS OF JANUARY 21, 1981. (SEE DOCUMENT FOR DETAILS). Assignors: GTE PRODUCTS CORPORATION A DE CORP.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

Definitions

  • a color cathode ray tube deflection system includes a color (5
  • SHEET 30F 4 If I 70 4
  • cathode ray tube deflection systems there are two rather broad and well-known cathode ray tube categories i.e., triad and in-line.
  • the triad system which is most common, utilizes a color cathode ray tube having red, green, and blue electron guns arrayed in the form of a triad with a viewing screen whereon red, green, and blue phosphor deposits are arrayed in a triad.
  • Electron beams from the electron gun are directed toward and impinge the phosphor dots on the viewing screen.
  • a deflection yoke and electromagnet means are normally employed to effect development of dynamically converged red, green, and blue traces on the viewing screen.
  • the other category of deflection system is the in-line type wherein a color cathode ray tube includes red, green, and blue electron guns arrayed along a horizontal axis.
  • a deflection yoke affixed to the cathode ray tube effects deflection of the electron beams from the in-line guns to provide a plurality of multi-sized rasters. These multiple rasters are altered in size by a size control which is also affixed to the in-line color cathode ray tube.
  • deflection yokes for the above-described triad and in-line cathode ray tube systems are of two well-known categories e saddle and toroid.
  • the saddle yoke normally em-, ploys a cosine distribution and manufacture often includes coating wire with a thermosetting plastic and pressing into a desired shape.
  • saddle yokes are undesirably heavy, due to the large amount of wire, undesirably expensive, and leavesomething to be desired in uniformity and repeatability of obtainable results.
  • the toroid-type deflection yoke utilizes a core member of relatively high permeability with horizontal and vertical deflection windings wrapped thereon.
  • the yoke is relatively light, inexpensive, and provides a highly desirable uniformity and repeatability of results.
  • the deflection system includes a color cathode ray tube wherein the electron guns are arrayed in a line, a toroid deflection yoke of a design compatible with the in-line color cathode ray tube, and a size control for altering the dimensions of a plurality of different sized rasters.
  • a deflection system adapted to an in-line color cathode ray tube is not particularly suitable to deflection systems employing a triad arrayed color cathode ray tube.
  • a deflection system employing a triad color cathode ray tube and a toroid deflection yoke is disclosed in U.S. application, Ser. No. 145,884 which is a continuation application of Ser. No. 841,893 (now abandoned) filed July 14, 1969 in the name of Charles Edward Torsch, the present applicant, and entitled Deflection System for Triad Beam Cathode Ray Tubes.
  • a deflection system for a triad color cathode ray tube utilizes a toroid deflection yoke to effect the appearance on a viewing screen of two horizontal trace lines having substantially identical arcs.
  • an object of the present invention to provide an enhanced cathode ray tube deflection system.
  • Another object of the invention is to provide an improved deflection system employing a triad-arrayed color cathode ray tube.
  • Still another object of the invention is to initiate an improved deflection system which includes a color cathode ray tube with electron guns arrayed in a triad and a toroid wound deflection yoke.
  • a further object of the invention is to provide an improved deflection system for effecting convergence of both horizontal and vertical trace lines on a viewing screen of a triad-arrayed color cathode ray tube.
  • a deflection system employing a color cathode ray tube having triad-arrayed electron guns, a toroid deflection yoke associated with the cathode ray tube, and radial convergence apparatus for effecting dynamic convergence of both horizontal and vertical trace lines on a viewing screen.
  • FIG. 1 is a top prospective illustration of a color cathode ray tube deflection system utilizing a triad-arrayed cathode ray tube, toroid deflection yoke, and convergence means;
  • FIG. 2 is a diagrammatic illustration of a toroid deflection yoke applicable to the deflection system of FIG. 1;
  • FIGS. 3 and 4 are graphical illustrations of the horizontal and vertical winding distribution of the toroid yoke of FIG. 2;
  • FIG. 5 is a graphic illustration of horizontal and vertical trace lines observable on the viewing screen of the cathode ray tube of FIG. 1;
  • FIG. 6 is a diagrammatic illustration of a convergence means suitable for use with the color cathode ray tube of FIG. 1.
  • FIG. 1 indicates a color cathode ray tube 9 having three electron guns ll, 13, and 15 arrayed in a triad configuration.
  • the electron guns ll, 13, and 15 provide electron beams 17, 19, and 21 which impinge triad-arrayed red, green, and blue phosphors on a viewing screen 23 to provide red, green, and blue traces.
  • the toroid deflection yoke 25, as illustrated in FIG. 2, includes a core member 31 of a relatively high permeability material with a horizontal axis H-l-l and a vertical axis V-V'.
  • First and second vertical deflection windings 33 and 35, respectively, having substantially the same number of turns wrapped on the core member 31 and indicated by blackened dots, are disposed upon opposite sides of the horizontal axis H-JI.
  • First and second horizontal deflection windings 37 and 39, respectively, having substantially the same number of turns wrapped about the core member 31 and indicated by white dots, are disposed on opposite sides of the vertical axis V-V'.
  • the deflection yoke 25 is formed for association with the CRT 9 such that the blue electron gun 15 of the CRT 9 is above the horizontal axis H41 and the red and green electron guns 1! and 13 are below the horizontal axis l-H-l'. Also, the first vertical deflection winding 33 is located above the horizontal axis H-Ji' while the second vertical deflection winding 35 is below the horizontal axis I-I-I-l'.
  • first and second vertical deflection windings 33 and 35 are asymmetrical with respect to one another about the horizontal axis l-I-I-I' and each of the windings 33 and 35 is symmetrical with respect to the vertical axis V-V'.
  • the first and second horizontal deflection windings 37 and 39 are each asymmetrical with respect to the horizontal axis H-H' and symmetrical to one another about the vertical axis V-V'.
  • a curve 41! illustrates the accumulative turns in percent of that portion of one of the horizontal deflection windings 37 and 39 at an angle above the horizontal axis I'I-H'.
  • a second curve 43 graphically illustrates the accumulative turns in percent of one of the horizontal deflection windings 37 and 39 at any given angle 0 below the horizontal axis. Moreover, it has been found that variations of 0 within about 3 provide satisfactory results.
  • FIG. 4 graphically illustrates a comparison of the asymmetrical first and second vertical deflection windings 33 and 35.
  • the curve 45 illustrates the winding distribution or accumulative turns in percent of the first vertical deflection winding 33 at an angle 4) from the vertical axis V-V' and above the horizontal axis I-I-H.
  • Curve 47 illustrates the accumulative turns in percent of the second vertical deflection winding 35 at an angle d from the vertical axis V-V' and below the horizontal axis I-I-I'I'. Again, variations of d; within about 3 have been found to provide satisfactory results.
  • Ha 2.0246 2.0161 0 0.0076495 0 0.000064226 0 0.00000108l9 0" wherein 6 is the angular deviation from the horizontal axis I-I-l-I' and variable within about 3.
  • the horizontal deflection windings below the horizontal axis I-I-I-I' which are asymmetrical to the above-mentioned horizontal windings above the horizontal axis Ha, are represented by the following formulation:
  • the first vertical deflection winding 33 above the horizontal axis l-i-I-I' is represented by the following formulation:
  • the second vertical deflection winding 35 below the horizontal axis I-I-I-I' and asymmetrical to the above-mentioned first vertical deflection winding 33 is represented by the following formulation:
  • the turns of the second vertical winding 35 are more concentrated at the center thereof than the turns of the first vertical winding 33.
  • the turns of the first vertical winding 33 are more concentrated to the left and right of center than the turns of the second vertical winding 35.
  • each of the first and second horizontal deflection windings 37 and 39 includes an increased concentration of windings above the horizontal axis I-i-I-I' to I provide magnetic field compensation for the mechanical displacement of the red and green electron guns.
  • uniformity of the red and green traces above and below the horizontal axis l-l-I-I' is achieved.
  • the above-mentioned deflection yoke 25 and CRT 9 having triadarrayed red, green, and blue electron guns 1 1, l3, and 15 provide trace lines upon application of sawtooth potentials common to color TV receivers.
  • the horizontal red (R) and green (G) trace lines are of substantially similar slopes and tend to have substantially similar arcs while the horizontal blue (B) trace line tends to deviate therefrom whereupon correction of the blue (B) trace is required.
  • the vertical trace lines are represented by red (R) and green (G) trace lines forming substantially similar but oppositely directed arcs. These red (R) and green (G) trace lines are also disposed on opposite sides of the blue (B) trace line. Moreover, the above-mentioned condition is appropriate to but reversed for opposite sides of the viewing screen due to the horizontal alignment and positioning of the red and green electron guns. In other words, the red (R) trace line is external to the blue (B) trace line on one side of the viewing screen but internal thereto on the other side of the viewing screen. A similar condition also exists for the green (G) trace lines.
  • a convergence means in the form of static and dynamic convergence apparatus, 27 of FIG. 1, and blue lateral magnet means 29 are employed.
  • Such apparatus is well known in the color TV art and presently utilized in systems with triad-arrayed cathode ray tubes and socalled saddle-type deflection yokes.
  • FIG. 6 illustrates a preferred form of convergence means wherein a permanent magnet 49 is affixed to an electromagnet 51 positioned adjacent each one of the red (R), green (G), and blue (8) electron guns.
  • the permanent magnets 49in conjunction with the blue lateral magnet, 29 of FIG. 1, serve to efiect static convergence at the center of the viewing screen 23.
  • the electronmagnets 51 serve to effect dynamic radial alteration of the electron beams emanating from the electron guns (R, G, and B) as indicated by the arrows.
  • the toroid deflection yoke 25 employed with a color cathode ray tube 9 with triad-arrayed red, green, and blue electron guns 11, 13, and 15 serve to provide both horizontal and vertical deflection of the electron beams.
  • This deflection is of a design such that red (R) and green (G) horizontal traces have substantially similar arcs while the red (R) and green (G) vertical traces have similar but oppositely directed arcs.
  • the horizontal blue (B) trace deviates from the horizontal red (R) and green (G) traces while the vertical blue (B) trace is disposed intermediate the vertical red (R) and green (G) traces.
  • a convergence means well known in the color TV art, is utilized to effect the desired convergence of the above-mentioned trace lines in both horizontal and vertical directions.
  • a unique color cathode ray tube deflection system which includes a triad-arrayed color cathode ray tube, a toroid deflection yoke, and a convergence means.
  • the non-symmetry of the triad-arrayed CRT in conjunction with the asymmetrical toroid yoke provides a desired trace line convergence at a minimum of cost as compared with other known systems.
  • the toroid yoke tends to provide a desired reduction in component weight, cost and size which enhances the uniformity and repeatability of the desired result.
  • a color cathode ray tube deflection system comprising:
  • a color cathode ray tube having triad-arrayed red, green, and blue electron guns each emanating an electron beam for effecting red, green, and blue horizontal and vertical traces on a viewing screen;
  • a toroid deflection yoke associated with said color cathode ray tube and including a core of magnetic material having horizontal and vertical axes with horizontal and vertical deflection windings wrapped about said core and substantially asymmetrical about said horizontal axis and symmetrical about said vertical axis;
  • dynamic convergence means associated with said color cathode ray tube for efiecting electron beam radial movement and in combination with said toroid deflection yoke effecting convergence of both horizontal and vertical red, green, and blue traces on said viewing screen.
  • deflection system of claim 1 wherein said deflection yoke includes first and second horizontal deflection windings disposed on opposite sides of said vertical axis wherein each have substantially the same number of turns.
  • deflection system of claim 1 wherein said deflection yoke includes first and second vertical deflection windings disposed on opposite sides of said horizontal axis with each having substantially the same number of turns.
  • Vb 0.77343 1.6922 at 0.0022040 rb' -0.000063614 4i 0.00000044608 it wherein (b is the angular deviation from the vertical axis V-V' within about 3.
  • said blue electron gun is disposed above and said red and green electron guns of said color cathode ray tube are disposed below said horizontal axis of said core and said vertical deflection windings include a first vertical deflection winding disposed above said horizontal axis with substantially identical portions on opposite sides of said vertical axis and at least percent of the total turns of one portion within a counter-clockwise angle of 45 as measured from the vertical axis.
  • a deflection system comprising:
  • color cathode ray tube means providing red, green, and blue horizontal and vertical traces on a viewing screen, said traces derived from electron beams emanating from triadarrayed red, green, and blue electron guns;
  • toroid deflection yoke means associated with said color cathode ray tube means for effecting horizontal and vertical deflection of said electron beams
  • said yoke means including a core of magnetic material having horizontal and vertical axes, first and second horizontal deflection windings wrapped about said core on opposite sides of said vertical axis with each winding asymmetrical to said horizontal axis and first and second vertical deflection windings wrapped about said core on opposite sides of said horizontal axis with each of said windings substantially symmetrical to said vertical axis and asymmetrical to said horizontal axis;
  • static convergence means associated with said color cathode ray tube for effecting convergence of said electron beams at the center of said viewing screen, said means including red, green, and blue radial magnets and a blue lateral magnet;
  • dynamic convergence means associated with said color cathode ray tube for effecting radial movement of said electron beams during deflection thereof by said yoke means to provide converged horizontal and vertical red, green, and blue traces, said means including an electromagnet for effecting radial movement of each of said red, green, and blue electron beams.
  • said color cathode ray tube includes a blue electron gun above and red and green electron guns below said horizontal axis of said core and said deflection yoke means provides a lower concentration of vertical windings at the center portion above said horizontal axis as compared with the concentration of windings at the center portion below said horizontal axis whereby convergence of horizontal and vertical red, green, and blue traces is effected.

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
US160865A 1971-07-08 1971-07-08 Asymmetrical-wound toroid yoke cathode ray tube deflection system Expired - Lifetime US3671897A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US16086571A 1971-07-08 1971-07-08

Publications (1)

Publication Number Publication Date
US3671897A true US3671897A (en) 1972-06-20

Family

ID=22578790

Family Applications (1)

Application Number Title Priority Date Filing Date
US160865A Expired - Lifetime US3671897A (en) 1971-07-08 1971-07-08 Asymmetrical-wound toroid yoke cathode ray tube deflection system

Country Status (2)

Country Link
US (1) US3671897A (enrdf_load_stackoverflow)
FR (1) FR2144901B3 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4232253A (en) * 1977-12-23 1980-11-04 International Business Machines Corporation Distortion correction in electromagnetic deflection yokes

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB514170A (en) * 1938-04-27 1939-11-01 British Thomson Houston Co Ltd Improvements in the magnetic deflection of the ray in cathode ray tubes
US2925542A (en) * 1957-05-31 1960-02-16 Gen Electric Deflection and dynamic convergence system for multi-beam cathode ray tubes
US3430099A (en) * 1966-08-23 1969-02-25 Gen Electric Simplified deflection system for plural in-line beam cathode ray tube
US3548350A (en) * 1969-01-15 1970-12-15 Gen Electric Wide angle deflection yoke for producing optimally non-uniform deflection fields

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB514170A (en) * 1938-04-27 1939-11-01 British Thomson Houston Co Ltd Improvements in the magnetic deflection of the ray in cathode ray tubes
US2925542A (en) * 1957-05-31 1960-02-16 Gen Electric Deflection and dynamic convergence system for multi-beam cathode ray tubes
US3430099A (en) * 1966-08-23 1969-02-25 Gen Electric Simplified deflection system for plural in-line beam cathode ray tube
US3548350A (en) * 1969-01-15 1970-12-15 Gen Electric Wide angle deflection yoke for producing optimally non-uniform deflection fields

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4232253A (en) * 1977-12-23 1980-11-04 International Business Machines Corporation Distortion correction in electromagnetic deflection yokes

Also Published As

Publication number Publication date
FR2144901B3 (enrdf_load_stackoverflow) 1975-09-05
FR2144901A1 (enrdf_load_stackoverflow) 1973-02-16

Similar Documents

Publication Publication Date Title
CA1124308A (en) Deflection yoke with permanent magnet raster correction
US3725831A (en) Magnetic beam adjusting arrangements
US4231009A (en) Deflection yoke with a magnet for reducing sensitivity of convergence to yoke position
US4386331A (en) Deflection yoke
US4464643A (en) Device for displaying television pictures and deflection unit therefor
US4237437A (en) Deflection unit for color television display tubes
GB1335508A (en) Colour cathode ray tube
US3721930A (en) Deflection yoke for use with in-line electron guns
GB1078986A (en) Magnetic electron beam control in image reproducing devices
US4823046A (en) Color picture tube with astigmatism correction means
US3671897A (en) Asymmetrical-wound toroid yoke cathode ray tube deflection system
US3375389A (en) Adjustable convergence magnets
US4455542A (en) Device for displaying television pictures including a deflection unit therefor
GB1299491A (en) Toroidal electromagnetic deflection yoke
US3689860A (en) Color picture tubes
US2880339A (en) Device for cathode ray tube
US3668580A (en) Toroidal deflection yoke having asymmetrical windings
JP3041950B2 (ja) 偏向ヨーク
US3192452A (en) Magnetic beam positioning device
US4238751A (en) Deflection yoke for color picture tube
US3555473A (en) Convergence apparatus
GB1467825A (en) Television deflection coil device
KR950000507Y1 (ko) 편향요크의 지어메트리컬 디스토션 보정장치
US4492943A (en) Device for displaying television pictures and deflection unit therefor
US3700954A (en) Color picture tube device

Legal Events

Date Code Title Description
AS Assignment

Owner name: NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP.,

Free format text: ASSIGNS ITS ENTIRE RIGHT TITLE AND INTEREST, UNDER SAID PATENTS AND APPLICATIONS, SUBJECT TO CONDITIONS AND LICENSES EXISTING AS OF JANUARY 21, 1981.;ASSIGNOR:GTE PRODUCTS CORPORATION A DE CORP.;REEL/FRAME:003992/0284

Effective date: 19810708

Owner name: NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP.

Free format text: ASSIGNS ITS ENTIRE RIGHT TITLE AND INTEREST, UNDER SAID PATENTS AND APPLICATIONS, SUBJECT TO CONDITIONS AND LICENSES EXISTING AS OF JANUARY 21, 1981.;ASSIGNOR:GTE PRODUCTS CORPORATION A DE CORP.;REEL/FRAME:003992/0284

Effective date: 19810708