US3575625A - Color tube with convergence electrode mounting and connecting structure - Google Patents

Color tube with convergence electrode mounting and connecting structure Download PDF

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Publication number
US3575625A
US3575625A US813938A US3575625DA US3575625A US 3575625 A US3575625 A US 3575625A US 813938 A US813938 A US 813938A US 3575625D A US3575625D A US 3575625DA US 3575625 A US3575625 A US 3575625A
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Prior art keywords
plates
beams
plural
convergence
color
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Expired - Lifetime
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US813938A
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English (en)
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Senri Miyaoka
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Sony Corp
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Sony Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/20—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours
    • H01J31/201—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours using a colour-selection electrode
    • H01J31/203—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours using a colour-selection electrode with more than one electron beam
    • H01J31/206—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours using a colour-selection electrode with more than one electron beam with three coplanar electron beams
    • 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
    • H01J29/48—Electron guns
    • H01J29/51—Arrangements for controlling convergence of a plurality of beams by means of electric field only

Definitions

  • a closed conductive loop that includes the first plates by flux UNITED STATES PATENTS change of the magnetic field of the main deflection yoke is 2,163,233 6/1939 Brown 313/78 avoided by mounting the first plates in a cantilevered manner 2,168,892 8/1939 Zworykin 313/80 at one end and by omitting any conductive connections 2,170,944 8/1939 Glass et al.... 313/78X between the remainder of such plates so that a conductive 2,459,724 1/1949 Selgin 313/78X loop does not exist for the induced current.
  • This invention relates generally to plural-beam color picture tubes, and particularly to tubes of that type in which the plural beams are passed through the optical center of a common electron lens by which the beams are focused on the color phosphor screen so as to eliminate coma and spherical aberration by reason of the lens.
  • an electrostatic convergence deflecting means Arranged between the focusing lens and the color screen is an electrostatic convergence deflecting means by which the beams divergent from the optical axis are deflected substantially in the plane of origination thereof for causing all of the beams to converge at a common location on a beam selecting means, such as an aperture grill, and to pass therethrough for impingement on respective color phosphors of a color screen. Further, between the focusing lens and the beam selecting means, the beams are acted upon by the magnetic fields resulting from the application of horizontal and vertical sweep signals to a main deflection yoke, whereby the beams are made to scanthe screen in the desired raster.
  • a beam selecting means such as an aperture grill
  • the convergence deflecting means of the foregoing color picture tube conveniently comprises a first paid of spaced plates between which the central beam is passed, and a second pair of plates spaced outwardly from the first plates so that the divergent beams are passed between the first and second plates to be deflected for convergence by electrical fields provided therebetween when one voltage is applied to both first plates and a different voltage is applied to both second plates.
  • the length of the neck of the tube envelope is undesirably increased and requires a corresponding increase in the depth of the television receiver cabinet to accommodate the tube.
  • the neck portion of the tube is shortened, which requires that the convergence deflection plates extend closely adjacent to the main deflection yoke, and if the first plates are interconnected to constitute a closed conductive path, a magnetic field of the main deflection yoke induces a current flow in the closed path constituted by the interconnected first plates, and such current flow produces a magnetic field that deflects the central beam away from accurate convergence with the other two beams.
  • the misconvergence that would result from the proximity of the convergence deflection plates to the main deflection yoke is avoided by mounting the first convergence deflection plates, that is, the plates between which the central beam passes, so that the latter do not constitute parts of a closed conductive loop or path through which an induced current could be made to flow by a magnetic field of the main deflection yoke.
  • FIG. 1 is a schematic sectional view in a horizontal plane passing through the axis of a single-gun, plural-beam color picture tube of the type to which this invention is preferably applied;
  • FIG. 2 is a fragmentary sectional view taken in the same plane as FIG. 1, and which shows the structural arrangement of a portion of such tube in order to reduce the length of the neck portion of the tube envelope;
  • H6. 3 is a transverse sectional view taken along the line 3-3 onFlG. 2;
  • FIGS. 2 and 3 are perspective views showing the arrangements of the convergence deflection plates in a tube as shown on FIGS. 2 and 3 in order to avoid misconvergence in accordance with two respective embodiments of this invention.
  • a single-gun, plural-beam color picture tube 10 of the type to which this invention may be applied comprises a glass envelope (not shown) having a neck and a cone extending from the neck to a color screen S provided with the usual arrays of color phosphors S 5 and S and with an apertured beam selecting grill or shadow mask G,..
  • a single electron gun A having cathodes K K and K each of which is constituted by a beam-generating source with the respective beam-generating surfaces thereof disposed as shown in a plane which is substantially perpendicular to the axis of the electron gun.
  • the beam-generating surfaces are arranged in a straight line so that the respective beams B,,, B and B emitted therefrom are directed in a substantially horizontal or other common plane containing the axis of the gun, with the central beam B),- being coincident with such axis.
  • a first grid G is spaced from the beam-generating surfaces of cathodes K K and K and has apertures g,,,, g,,;, and g, formed therein in alignment with the respective cathode beam-generating surfaces.
  • a common grid G is spaced from the first grid G, and has apertures g g and g formed therein in alignment with the respective apertures of the first grid G,. Successively arranged in the axial direction away from the common grid G are openended,
  • tubular grids or electrodes G,,, G,, and G respectively, with cathodes K,,, K and K grids G, and G and electrodes G,,, G,, and G being maintained in the depicted, assembled positions thereof, bysuitable, nonillustrated support means of an insulating material.
  • a voltage of 0 to minus 400v. is applied to the grid G
  • a voltage of 0 to 500v. is applied to the grid 6
  • a voltage of 13 to 20kv. is applied to the electrodes G and G
  • a voltage of 0 to 400v. is applied to the electrode G, with all of these voltages being based upon the cathode voltage as a reference.
  • the voltage distributions between the respective electrodes and cathodes, and the respective lengths and diameters thereof, may be substantially identical with those of a unipotential single beam-type electron gun which is constituted by a single cathode and first and second, single-apertured grids.
  • an electron lens field will be established between grid G and the electrode G to form an auxiliary lens L' as indicated in dashed lines, and an electron lens field will be established around the axis of electrode G,,, by the electrodes G,,, G and G to form a main focusing lens L, again as indicated in dashed lines.
  • bias voltages of l00v., 0v., 300v., 20KV. 200v. and 20v. may be applied respectively to the cathodes K,,, K and K the first and second grids G, and G and the electrodes G,,, G, and G Further included in the electron gun of FIG.
  • electron beam convergence deflecting means F which comprise a first pair of shielding plates P and P disposed in the depicted spaced, relationship at opposite sides of the gun axis, and a second pair of axially extending, deflector plates Q and O which are disposed, as shown, in outwardly spaced, opposed relationship to shielding plates P and P' respectively.
  • the deflector plates Q and Q may, alternatively, be somewhat curved or outwardly bowed, as is well known in the art.
  • the shielding plates P and P are equally charged and disposed so that the central electron beam B will pass substantially undeflected between the shielding plates P and P, while the deflector plates and Q have negative charges with respect to the plates P and P so that respective electron beams B and B will be convergently deflected as shown by the respective passages thereof between the plates P and Q and the plates P and Q. More specifically, a voltage V, which is equal to the voltage applied to the electrode G may be applied to both shielding plates P and P, and a voltage V which is some 200 to 300v.
  • the electron beams B B and B which emanate from the beam generating surfaces of the cathodes K K and K will pass through the respective grid apertures g g and g,,,, to be intensity modulated with what may be termed the red, green and blue intensity modulation signals applied between the said cathodes and the first grid G,.
  • the respective electron beams will then pass through the common auxiliary lens L to cross each other at the center of the main lens L and to emerge from the latter with beams B and B diverging from beam B Thereafter, the central electron beam 8 will pass substantially undeflected between shielding plates P and P since the latter are at the same potential. Passage of the electron beams 8,, between the plates P and Q and of the electron beam B between the plates P and Q will, however, result in the convergent deflections thereof as a result of the convergence deflecting voltage applied therebetween, and the system of FIG.
  • the color phosphor screen S is composed of a large plurality of sets or arrays of vertically extending red, green and blue phosphor stripes or dots S S and 8,, with each of the arrays or sets of color phosphors forming a color picture element. It will be understood that the common spot of beam convergence corresponds to one of the thusly formed color picture elements.
  • Electron beam scanning of the face of the color phosphor screen is effected by horizontal and vertical deflection yoke means indicated in broken lines at D and which receives horizontal and vertical sweep signals whereby a color picture will be provided on the color screen. Since, with this arrangement, the electron beams are each passed, for focusing through the center of the main lens L of electron gun A, the beam spots formed by impingement of the beams on the color phosphor screen S will be substantially free from the effects of coma and/or astigmatism of the main lens, whereby improved color picture resolution will be provided.
  • the plates P and P were supported, at the sides of their ends closest to electrode G,,, by angle members 12 and 13 secured to a flange 11 at the adjacent end of a tubular extension of electrode 0,, which is, in turn, supported within tube neck N by insulating discs 24 and having getter rings 22 and 23 suitably mounted therebetween.
  • the forward ends of plates P and P were joined, at the sides of the latter, by conductive bracing members 21 extending therebetween.
  • the voltage V is,.
  • the voltage V is applied to coating 17 by way of an anode button (not shown) provided in cone portion C, and is applied to electrode G from plates P and P by way of angle members 12 and 13. From electrode G the voltage V may be applied to electrode G; by way of a suitable conductor (not shown). The voltage V may also be applied to aperture grill G as an anode voltage, by way of coating 17.
  • Posts or pins 14 extend outwardly from plates P and P and, at their outer ends, carry glass beads 15 by which plates Q and 2 are supported while being insulated with respect to plates P and P.
  • the voltage V is applied to plate Q by a conducting lead 20 extending from a button 19 in neck N and the voltage V, is applied to plate 0' by way of a conducting lead 16 extending between plates 0 and Q and being spaced from plates P and P.
  • the convergence deflecting means F is located closely adjacent to the main deflection yoke D, and may even axially overlap the location of the latter as shown on FIG. 2. However, when convergence deflecting means F is thus located, it is disposed within the magnetic field with vertical lines of flux produced by main deflecting yoke D for causing the beams to horizontally scan the color screen.
  • such misconvergence is avoided by mounting the plates P and P so that the latter will not constitute parts of a closed conductive loop in which a current can be induced to flow by a magnetic field of yoke D.
  • Such closed conductive loop is avoided, in accordance with the invention, by electrically connecting plates P and P only at one end thereof.
  • the ends of plates P and P closes to electrode G are mounted on flange 11 of the latter by flanges 112 and 113 directed outwardly from such ends of the plates and having cutouts, as at 1130, through which beams 13,, and B may pass for entering between plates P and Q and plates P and Q.
  • the opposite or forward ends of plates P and P may be free of each other (FIG. 5) or merely held in spaced relation by members 26 and 27 of an electrically insulating material.
  • the forward ends of plates P and P are insulated from each other either by members 26 and 27 or by air.
  • metal pins 114a and 11412 are welded, soldered or otherwise secured to opposite longitudinal edges of plate P to locations spaced apart along the latter, and metal pins 114'a and 114b are similarly secured to plate P' at locations that are opposed to pins 114a and 114b, respectively.
  • the pins 114a and 11411, and the pins 114a and ll4'b extend perpendicular to the planes of the respective plates P and P and are of sufficient length, as shown, to extend between plates 0 and Q.
  • pins 114a and 114'a adjacent plate Q are anchored in an insulating member traversing the outer surface of plate 0 and being suitably secured thereto, and ends of pins 114]; and ll4'b are similarly anchored in an insulating member 15 traversing and being secured on the 'outer surface of plate 0.
  • the opposite ends of pins 114a and l14'a and of pins 11417 and ll4'b are similarly anchored in insulating members 15 traversing and being secured on the outer surface of plate 0.
  • plates P and P' have cutouts or notches 28 and 28, respectively, through which pins 114a and ll4'b and pins 114a and 1l4b respectively pass without contacting plates P and P'.
  • the above described structure supports plates Q and Q in spaced relation to plates P and P, respectively, while being insulated from the latter. Further, such structure, maintains the spaced relation of plates P and P forwardly of the flanges 12 and 13 for mounting an electrode flange 11, while avoiding the formation of a closed conductive loop that includes plates P and P and in which a current could be induced by the proximity of the convergence deflecting device F to the yoke D.
  • the voltage V,. can be applied to plates P and P by a spring or springs (not shown) similar to the spring 18 of FIG. 2, which such plates P and P being electrically connected to each other only at one end by way of flanges ll, 12 and 13. Further, the voltage V can be applied to plate 0 in the manner described above in connection with FIG.- 2, and from plate 0 to plate Q by way of a conductor 116 which is spaced from plates P and P.
  • a plural-beam color picture tube comprising a color screen having arrays of color phosphors, and beam selecting means with apertures corresponding to said arrays, beam generating means for directing a plurality of electron beams toward said color screen for impingement on respective phosphors of each array through the corresponding aperture,
  • said convergence deflecting means including first plates which are spaced apart for the passage of said one beam therebetween, second plates spaced outwardly from said first plates so that each of said two beams passes between a first plate and a second plate and means to apply one voltage to said first plates and a different voltage to said second plates so that the voltage difference between said first plates and said second plates produces electrical fields therebetween for effecting said convergence, said convergence deflecting means being disposed closely adjacent to said magnetic yoke means so as to reduce the necessary length of the tube, said first plates being electrically connected to each other only at one end to avoid the provision of a closed conductive loop that includes said first plates andin which a current could be induced to flow by said
  • a plural-beam color picture tube according to claim 1 in which insulating members extend between the other ends of said first plates to maintain the latter in spaced relation.
  • a plural-beam color picture tube according to claim 1 in
  • a plural-beam color picture tube in which said conductive pins extend past the opposite longitudinal edges of said first plates, said longitudinal edges have cutouts therein, and each of said pins connected with one of said first plates extends with clearance through a respective one of said cutouts in the other of said first plates.
  • a plural-beam color picture tube in which said conductive pins are arranged in pairs extending past the opposite longitudinal edged of said first plates, with one pin of each of said pairs thereof being connected with one of said first plates and the other pin of the respective pair of pins being connected with the other of said first plates.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Nanotechnology (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
US813938A 1968-04-13 1969-04-07 Color tube with convergence electrode mounting and connecting structure Expired - Lifetime US3575625A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2462168 1968-04-13
DE19691922229 DE1922229B2 (de) 1968-04-13 1969-04-30 Farbbild wiedergaberoehre
GB22167/69A GB1221043A (en) 1968-04-13 1969-05-01 Color picture tube
NL6906914A NL6906914A (de) 1968-04-13 1969-05-06
FR6916386A FR2044422A5 (de) 1968-04-13 1969-05-20

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US813938A Expired - Lifetime US3575625A (en) 1968-04-13 1969-04-07 Color tube with convergence electrode mounting and connecting structure
US815050A Expired - Lifetime US3579008A (en) 1968-04-13 1969-04-10 Color tube having asymetrical electrostatic convergence correction system

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US815050A Expired - Lifetime US3579008A (en) 1968-04-13 1969-04-10 Color tube having asymetrical electrostatic convergence correction system

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US (2) US3575625A (de)
DE (2) DE1918877B2 (de)
FR (2) FR2006209A1 (de)
GB (2) GB1216436A (de)
NL (2) NL162784C (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735189A (en) * 1971-03-19 1973-05-22 Zenith Radio Corp Blue droop correction circuit with a single supplemental correction coil
US3735190A (en) * 1971-08-31 1973-05-22 Gte Sylvania Inc Color cathode ray tube
DE2320713A1 (de) * 1972-04-25 1973-11-15 Sony Corp Kathodenstrahlroehre
USRE29895E (en) * 1968-12-30 1979-01-30 Sony Corporation Convergence means for a plural beam color picture tube

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4086513A (en) * 1975-03-03 1978-04-25 Rca Corporation Plural gun cathode ray tube having parallel plates adjacent grid apertures

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2163233A (en) * 1935-08-02 1939-06-20 Jesse E Brown Cathode ray tube
US2168892A (en) * 1934-04-28 1939-08-08 Rca Corp Cathode ray device
US2170944A (en) * 1937-05-29 1939-08-29 Bell Telephone Labor Inc Multicathode ray discharge device
US2459724A (en) * 1946-11-27 1949-01-18 Farnsworth Res Corp Astatic cathode-ray tube
US2921228A (en) * 1954-05-18 1960-01-12 Itt Color television apparatus
US3358172A (en) * 1965-07-28 1967-12-12 M O Valve Co Ltd Cathode ray tube with means for splitting the electron beam into individually deflected and focused beams
US3448316A (en) * 1967-01-14 1969-06-03 Sony Corp Cathode ray tube

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL45861C (de) * 1932-07-13
BE469304A (de) * 1945-10-06
US3185880A (en) * 1961-06-30 1965-05-25 Edgerton Germeshausen & Grier Electron stream deflection apparatus
GB1217240A (en) * 1967-04-06 1970-12-31 Sony Corp New and improved color picture tube system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2168892A (en) * 1934-04-28 1939-08-08 Rca Corp Cathode ray device
US2163233A (en) * 1935-08-02 1939-06-20 Jesse E Brown Cathode ray tube
US2170944A (en) * 1937-05-29 1939-08-29 Bell Telephone Labor Inc Multicathode ray discharge device
US2459724A (en) * 1946-11-27 1949-01-18 Farnsworth Res Corp Astatic cathode-ray tube
US2921228A (en) * 1954-05-18 1960-01-12 Itt Color television apparatus
US3358172A (en) * 1965-07-28 1967-12-12 M O Valve Co Ltd Cathode ray tube with means for splitting the electron beam into individually deflected and focused beams
US3448316A (en) * 1967-01-14 1969-06-03 Sony Corp Cathode ray tube

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE29895E (en) * 1968-12-30 1979-01-30 Sony Corporation Convergence means for a plural beam color picture tube
US3735189A (en) * 1971-03-19 1973-05-22 Zenith Radio Corp Blue droop correction circuit with a single supplemental correction coil
US3735190A (en) * 1971-08-31 1973-05-22 Gte Sylvania Inc Color cathode ray tube
DE2320713A1 (de) * 1972-04-25 1973-11-15 Sony Corp Kathodenstrahlroehre
US3887837A (en) * 1972-04-25 1975-06-03 Sony Corp Cathode ray tube

Also Published As

Publication number Publication date
DE1922229A1 (de) 1970-11-26
FR2044422A5 (de) 1971-02-19
NL162784B (nl) 1980-01-15
NL6905716A (de) 1969-10-15
GB1221043A (en) 1971-02-03
GB1216436A (en) 1970-12-23
NL6906914A (de) 1970-11-10
US3579008A (en) 1971-05-18
DE1922229B2 (de) 1972-01-20
FR2006209A1 (de) 1969-12-19
NL162786B (nl) 1980-01-15
NL162786C (nl) 1980-01-15
NL162784C (nl) 1980-01-15
DE1918877A1 (de) 1969-11-06
DE1918877B2 (de) 1972-02-17

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