US2945157A - Picture tubes for three-colour television systems comprising deflection coils - Google Patents

Picture tubes for three-colour television systems comprising deflection coils Download PDF

Info

Publication number
US2945157A
US2945157A US767675A US76767558A US2945157A US 2945157 A US2945157 A US 2945157A US 767675 A US767675 A US 767675A US 76767558 A US76767558 A US 76767558A US 2945157 A US2945157 A US 2945157A
Authority
US
United States
Prior art keywords
deflection
coils
screen
beams
tube
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
US767675A
Other languages
English (en)
Inventor
Haantjes Johan
Lubben Gerrit Jan
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.)
US Philips Corp
North American Philips Co Inc
Original Assignee
US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US2945157A publication Critical patent/US2945157A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/16—Picture reproducers using cathode ray tubes
    • H04N9/28—Arrangements for convergence or focusing
    • H04N9/285—Arrangements for convergence or focusing using quadrupole lenses
    • 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

Definitions

  • each beam strikes a determined phosphor element provided on or behind the screen, whereby each element fluorcsces in another colour.
  • said control is effected in a manner such that the three beams each pass through an aperture of the mask at relatively different angles of incidence and then strike the blue, red and green phosphor elements provided in punctiform on the plate located behind the mask.
  • screen is to be understood in this case to mean the above-mentioned mask which must be struck by the three beams in each case at substantially the same point.
  • the picture device mitigates this disadvantage and is characterized in that for the direction of deflection which is parallel t'o' a plane containing two of the three guns, the meridionalimage plane substantially coincides with the screen of the picture tube and for the other direction of deflection the 2,945,157 Patented July 12, 1960 'ice sagittal image plane substantially coincides with said screen.
  • a further embodiment of the said picture device is characterized in that, by means of dynamic convergency, exerted only upon the electron beam produced by the gun located outside the plane containing the said two other guns, it is ensured that this electron beam, during deflection throughout the screen, on the screen overlaps the two other electron beams which, due to the coinciding of said image planes with the screen of the picture tube, are caused to overlap each other on the screen, independent of the extent of the deflection.
  • Fig. 1 shows diagrammatically a deflection system in which the points of incidence of the three electron beams and the resultant pictures are shown;
  • Fig. 2 shows a possible embodiment of the deflection coils for deflection in the vertical direction
  • Fig. 3 shows a portion of the field strength to be described hereinafter, which is produced by means of the coils of Fig. 2;
  • Fig. 4 shows a possible embodiment of the deflection coils for deflection in the horizontal direction
  • Fig. 5 shows a portion of the field strength to be described hereinafter, which is produced by means of the coils of Fig. 4;
  • Figs. 6, 7 and 8 show other embodiments of the coils in horizontal and vertical directions
  • Figs. 9 and 10 show possible circuit diagrams for connecting the coils of Figs. 7 and 8.
  • FIG. 1 shows a rectangular system of co-ordinates, wherein the z-axis represents the axis of the picture tube and the positive z-direction is the direction in which the electrons are travelling, whereas x and y are the directions in which the electrons are deflected.
  • the mask is represented diagrammatically by lines 1, 2, 7 and '10 and is located in the plane 2:2 at right angles to the axis of the tube.
  • line 5 is the meridional focal line (that is to say 5 is the position of the beams B, R, G and P located in the meridional image plane) and line 6 is the sagittal focal line (that is to say 6 is the position of the beams B, R, G and P located in the sagittal image plane) whereas upon deflection in the negative y-direction, line 8 is the sagittal focal line and 9 is the meridional focal line.
  • the sagittal and meridional image planes are curved, non-coincident surfaces.
  • the blue beam can again be caused to overlap the red and green beams by passing a parabolic current of line frequency (if X, is the deflection in a horizontal direction) through a second set of additional deflection coils, and said coils also must produce a field directed in parallel to the x-axis. Since in either case a field is to be produced directed in parallel to the x-axis, it suflices to use one set of additional coils which must be traversed by a current proportional to both X, and Y ⁇ .
  • the radius of curvature of the meridional image plane, in which the said meridional focal line is situated may be represented approximately by the formula so that this meridional image plane also changes to a flat plane, if A 0, which flat plane coincides with the mask of the picture tube.
  • H and H are the coeflicients of the power series
  • the first two terms of (9) provide together a positive contribution, so that the third term must provide a negative contribution.
  • H Y is negative with the direction of propagation of the electrons, chosen in this example, so that, since the contribution of the deflection is maximum at the end of the coils, the contribution of H must also be negative at the end of the coils.
  • the first term of (11) provides a positive contribution so that the second term must provide a negative contribution.
  • X is positive with the directions chosen in this example so that H must be positive at the end of the coils.
  • 11 and 12 indicate annular ferromagnetic cores, which may be arranged around the neck of a picture tube (40) and on which coils 13 to 20 are toroidally wound which serve for deflection in the vertical direction and coils 21 to 28 which serve for deflection in the horizontal direction.
  • Ring 12 is closer to the screen than ring 11.
  • the z-axis is also the axis of the picture tube, the coils 13, 14, 17 and 18 only being shown in full lines and the coils 21, 22, 25, and 26 in dashed lines.
  • the three guns are shown at the left, with the blue gun 41 located on the Y axis, and the red gun 42 below it.
  • the green gun 43 (see Fig. l) is in line with and behind the red gun 42 and will not be seen.
  • Figs. 7 and 8 show cross-sections of the cores 11 and 12 and in these cross-sections the orientations of the coils and the directions of the currents are shown.
  • the (x) sign indicates that the current at this area flows in the direction of the positive z-axis
  • a sign indicates that the current at this area flows in the direction of the negative z-axis.
  • t is half the acute angle between two coils having the same direction of current.
  • FIG. 9 and 10 A possible method of circuiting the various coils for deflection in the vertical direction is shown in Figs. 9 and 10.
  • the coils are represented by inductor symbols and given the same reference numerals as in Figs. 6 to 8.
  • Figs. 6 to 8 show the structural arrangement of the coils relative to the tube, whereas Figs. 9 and 10 show suitable circuit arrangements for energizing the coils.
  • the coils 13 to 16 arranged on the core 11 are connected in series, as are the coils 17 to 20 arranged on the core 12.
  • the two series-branches are connected together at their lower ends to a terminal 32 and at their upper ends, via the variable inductance 30, to a terminal 29.
  • the sawtooth current supplied to the terminals 29 and 32 may be distributed over the two branches in an arbitrary manner. It will be evident that the connection to the coils must be such that the direction of the current in each part has the proper polarity in the direction of the z-axis.
  • the coil 30 is required to be adjusted so that it does not act upon the deflection of the beams.
  • Fig. 10 shows another method of connecting the same coils.
  • the two series-branches are connected in series, a tapping between the coils 16 and 17 being connected via a lead 36 to a tapping on a variable inductance 34.
  • the sawtooth current is supplied to terminals 33 and 37 and, by shifting a core 35, the current may be distributed arbitrarily over the various branches so that the correct number of ampere turns for each branch may be obtained.
  • the method of connecting for deflection in the horizontal direction may be similar in either case.
  • the red and green beams always coincide and the blue beam is influenced by means of dynamic convergence.
  • it will be evident that it is alternatively possible to cause overlapping of two other beams, dependent upon the positioning of the deflection coils. It is necessary only that the deflection in one of the two directions is parallel to the plane in which two of the three guns are located.
  • a color cathode-ray tube comprising a substantially planar screen located substantially perpendicular to the axis ofand at one end of the tube, two electron guns arranged at the other end of the tube spaced from the tube axis and directed toward the screen and at which a straight line in a plane parallel to that of the screen joining the two guns is spaced from the axis, and a deflection coil system for deflecting the electron beams produced by the two guns in two orthogonal directions,
  • said coil system being operable to cause the beams from said two guns to form a linearly elongated cross-section whose longest dimension is perpendicular to said one deflection direction and which is located in a meridional image plane which substantially coincides with the plane of said screen for said one deflection direction, and to form a linearly elongated cross-section whose longest dimension is parallel to the other deflection direction and which is located in a sagittal image plane which substantially coincides with the plane of said screen for said other deflection direction.
  • a three-color cathode-ray tube comprising a substantially planar screen located substantially perpendicular to the axis of and at one end of the tube, three electron guns arranged at the other end of the tube and symmetrically around the tube axis and directed toward the screen and at which straight lines in a plane parallel to that of the screen joining the three guns form a triangle, a deflection coil system for deflecting the electron beams produced by the three guns in two orthogonal directions, one of said orthogonal directions extending parallel to the straight line joining two of the said guns in the parallel plane, said coil system being operable to cause the beams from said two guns to form a linearly elongated cross-section whose longest dimension is perpendicular to said one deflection direction and which is located in a meridional image plane which substantially coincides with the plane of said screen for said one deflection direction, and to form a linearly elongated cross-section whose longest dimension is parallel to the other deflection direction and which is located in a sagittal
  • a cathode-ray tube having a substantially planar apertured screen extending substantially at right angles to the longitudinal axis of the tube and three electron guns arranged symmetrically around the tube axis for producing three electron beams directed toward the screen; and electromagnetic deflection means located between said electron guns and said screen for producing a deflecting field within the tube for deflecting said electron beams in two substantially perpendicular directions, whereby said beams may be caused jointly to scan said screen, one of said perpendicular directions extending parallel to a straight line in a plane parallel to the screen joining two of the guns, said deflection means including first and second ferromagnetic annular members surrounding the tube with the second member being closer to the screen than the first member, a first coil system for deflecting said beam in said one direction of deflection comprising a first set of four coils wound toroidally on the first annular member and a second set of four coils wound toroidally on the second annular member, a second coil system for deflecting said beam in the
  • first and second sets of coils produce a field having a magnitude equal to 3 +4 cos t/J which magnitude is predominately negative for the first set and predominately positive for the second set
  • third and fourth sets produce a field having a magnitude equal to COSZWI which latter magnitude is predominately positive for the third set and predominately negative for the fourth set
  • 0 is the angle between lines drawn from the first and second sets toward the tube axis and the said one deflection direction
  • 0 is the angle between lines drawn from the third and fourth sets toward the tube axis and the other deflection direction
  • p and p are the radii, respectively, of the first and second annular members.
  • a cathode-ray tube having a substantially planar apertured screen extending substantially at right angles to the longitudinal axis of the tube and three electron guns arranged symmetrically around the tube axis for producing three electron beams directed toward the screen; and electromagnetic deflection means located between said electron guns and said screen for producing a deflecting field within the tube for deflecting said electron beams in two substantially perpendicular directions, whereby said beams may be caused jointly to scan said screen, one of said perpendicular directions extending parallel to a straight line in a plane parallel to the screen joining two of the guns, said deflection means including a first pair of coil halves diametrically surrounding the tube for deflection in said one direction and a second pair of coil halves diametrically surrounding the tube between and symmetrically relative to the first pair for deflection in the other direction, the coils of said first pair having a shape producing a field at which the value measured at the coil end adjacent the screen is predominately positive but at the beginning of the coil is pre

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
US767675A 1957-12-11 1958-10-16 Picture tubes for three-colour television systems comprising deflection coils Expired - Lifetime US2945157A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL223160 1957-12-11

Publications (1)

Publication Number Publication Date
US2945157A true US2945157A (en) 1960-07-12

Family

ID=19751057

Family Applications (1)

Application Number Title Priority Date Filing Date
US767675A Expired - Lifetime US2945157A (en) 1957-12-11 1958-10-16 Picture tubes for three-colour television systems comprising deflection coils

Country Status (7)

Country Link
US (1) US2945157A (en, 2012)
CH (1) CH369165A (en, 2012)
DE (1) DE1173514B (en, 2012)
ES (1) ES245848A1 (en, 2012)
FR (1) FR1215448A (en, 2012)
GB (1) GB840079A (en, 2012)
NL (2) NL113454C (en, 2012)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3225271A (en) * 1962-07-19 1965-12-21 Philips Corp Deflection coil system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2679614A (en) * 1952-09-17 1954-05-25 Rca Corp Beam-controlling system for tricolor kinescopes
US2719249A (en) * 1950-12-22 1955-09-27 Rca Corp Beam alignment device
US2747134A (en) * 1953-04-30 1956-05-22 Rca Corp Dual focus cathode-ray tubes
US2751519A (en) * 1950-05-26 1956-06-19 Rca Corp Electron beam controlling system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2751519A (en) * 1950-05-26 1956-06-19 Rca Corp Electron beam controlling system
US2719249A (en) * 1950-12-22 1955-09-27 Rca Corp Beam alignment device
US2679614A (en) * 1952-09-17 1954-05-25 Rca Corp Beam-controlling system for tricolor kinescopes
US2747134A (en) * 1953-04-30 1956-05-22 Rca Corp Dual focus cathode-ray tubes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3225271A (en) * 1962-07-19 1965-12-21 Philips Corp Deflection coil system

Also Published As

Publication number Publication date
NL113454C (en, 2012)
DE1173514B (de) 1964-07-09
FR1215448A (fr) 1960-04-19
NL223160A (en, 2012)
CH369165A (de) 1963-05-15
ES245848A1 (es) 1959-06-16
GB840079A (en) 1960-07-06

Similar Documents

Publication Publication Date Title
FI60086C (fi) Sjaelvkonvergerande faergtelevisionsaotergivningssystem
US3930185A (en) Display system with simplified convergence
US3440483A (en) Color television display device
US2925542A (en) Deflection and dynamic convergence system for multi-beam cathode ray tubes
US3714500A (en) Color television display device
US4242612A (en) Deflection unit for color television display tubes
KR100464706B1 (ko) 소정의 각도 범위 내에 권선 공간을 구비한 새들형 편향 권선
US2866125A (en) Cathode-ray tube
US3793554A (en) Colour television display apparatus provided with a cathode-ray tube
US4227122A (en) Convergence device for projection type color television system
KR100464707B1 (ko) 기하학적 왜곡 보정용 편향 요크
US2255039A (en) Cathode ray deflecting device
US2945157A (en) Picture tubes for three-colour television systems comprising deflection coils
US4455542A (en) Device for displaying television pictures including a deflection unit therefor
GB835789A (en) Improvements in or relating to cathode ray tubes
US2806164A (en) Beam convergence apparatus for tri-color kinescopes
US2443032A (en) Electromagnetic deflecting yoke and circuit
US3689860A (en) Color picture tubes
US3789258A (en) Electron beam and deflection yoke alignment for producing convergence of plural in-line beams
US3857057A (en) Colour television display apparatus provided with a picture display tube with electron beams generated in one plane
JPH07509093A (ja) 陰極線管用の寸法形状補正されたセルフコンバーゼント型電子ビーム偏向装置
JPH0652648B2 (ja) カラーテレビジョン表示装置
US3195025A (en) Magnetic deflection yoke
FI106893B (fi) Värinäyttöjärjestelmä, joka sisältää itsekonvergoivan, rasterivääristymän korjauksella varustetun poikkeutuskelayksikön
US2866129A (en) Cathode-ray tube