US3467881A - Color picture tube - Google Patents

Color picture tube Download PDF

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US3467881A
US3467881A US718738A US3467881DA US3467881A US 3467881 A US3467881 A US 3467881A US 718738 A US718738 A US 718738A US 3467881D A US3467881D A US 3467881DA US 3467881 A US3467881 A US 3467881A
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electron
electron beams
color
grid
beams
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US718738A
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Akio Ohgoshi
Satoshi Shimada
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

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  • a new and improved color picture tube system of the single-gun, plural-beam type includes electron beam deflection means which comprise first and second, successively arranged electron beam detlectors to insure that the respective electron beams will be properly converged to properly strike the different color phosphor stripes of the color phosphor screen throughout the entire extent of the latter.
  • This invention relates to a new and improved color picture tube system and, more particularly, to a new and improved single-gun, plural-beam type color picture tube system.
  • the distance between the color phosphor screen and the screen, or beam landing position determining, grid or shadow-mask should be relatively short to minimize the axial length of the color picture tube.
  • it is of significant importance to the provision of high quality, color picture reproduction that a precise relationship in position be maintained between the portion of the screen grid or mask through which the beams pass and the color phosphor stripes of the color phosphor screen.
  • This angle can be increased by either increasing the distance between the three electron beams at the surface of the beam generating cathode or by increasing the distance between the main lens of the electron gun and the beam deection means. Increase in the spacing of the electron beams at the generating surface thereof, however, makes diflicult the imparting of a sufficient focussing effect on the beams whereby beam resolution, and accordingly, picture quality, are deteriorated. Similarly, any increase in the main lens deflection means distance is undesirable in that it of course results in increase in the overall length of the color picture tube.
  • the color picture tube system of this invention comprises electron beam deflection means which include first and second electron beam deflectors arranged successively between the beam generating cathode and the color phosphor screen.
  • the three electron beams provided by the beam generating source are caused to pass through the center of the main forcussing lens of the single electron gun with one of the beams emerging therefrom along the optical axis thereof, and the other two of the beams emerging therefrom in divergent directions.
  • the other two electron beams are deflected by the respective first and second beam deflectors, which are interposed between the color phosphor screen and the equivalent main lens of the single electron gun, and are caused to converge with the one electron beam at a common spot at a screen grid or mask provided in front of the color phosphor screen, to in turn properly strike the respective color phosphor stripes of the latter and insure excellent picture quality.
  • the three beams will be substantially free from the influence of coma and/ or astigmatism of the said electron gun lens whereby blurring of the color phosphor screen beam spots will be substantially prevented.
  • Another object of this invention is the provision of a single-gun, plural-beam type color picture tube system wherein the electron beams are passed through the optical center of the electron gun main lens to insure that the beams are substantially free from the influence of coma and/ or astigmatism of the former and result in the prevention of beam spot blurring on the face of the color phosphor screen.
  • Still another object of this invention is the provision of a singleegun, plural-beam type color picture tube system which is somewhat miniaturized and may be readily manufactured through the use of existing techniques.
  • FIG. 1 is a schematic diagram depicting a single-gun, plural-beam type color picture tube system constructed in accordance with the teachings of the prior art
  • FIG. 2 is a schematic diagram depicting the optical equivalent or analogy of the tube system of FIG. l;
  • FIG. 3 is a schematic diagram depicting an embodiment of a single-gun, plural-beam type color picture tube system constructed in accordance with the teachings of this invention
  • FIG. 4 is a schematic diagram depicting the optical equivalent or analogy of the tube system of FIG. 3;
  • FIG. 5 is a schematic diagram depicting another embodiment of a single-gun, plural-beam type color picture tube system constructed in accordance with the teachings of this invention.
  • FIG. 6 is a schematic diagram depicting still another embodiment of a single-gun, plural-beam type color picture tube system constructed in accordance with the teachings of this invention.
  • FIG. 7 is an end view which illustrates the magnetic convergence deflector means utilized in the tube system of FIG. 6;
  • FIG. 8 is a schematic diagram depicting still another embodiment of the single-gun, plural-beam type color picture tube system constructed in accordance with the teachings of this invention.
  • a prior art color picture tube system 10 comprises an electron gun A which includes a cathode K having the electron beam generating sources KR, KG and KB.
  • a first control grid G1, comprising three grid member G1R, GlG, and G1R is supported in slightly spaced, opposed relationship with the electron-emitting end surface 12 of the cathode K.
  • Apertures glR, glG and glR are respectively formed as shown in the said grid members, and a common grid G2 is disposed in the depicted, slightly spaced opposed relationship with the grid G1.
  • the common grid G2 comprises apertures g2R, g2G, and g2B formed therein as shown in alignment with the apertures of the said three grid members.
  • the grid G2 is cup-shaped to include an end plate 14 through which the apertures g2R, g2G and 12B extend at spaced locations on a diametrical line, and a cylindrical portion 16 which extends axially as shown in the direction away from control grid G1.
  • control grid G1 Sequentially arranged at axially spaced points in the direction away from the control grid G1 are open-ended, tubular grids or electrodes G3, G4 and G5, with these electrodes, the control grids G1 and G2 and the cathode K being assembled as described by means of suitable, nonillustrated supports of insulating material in the nature, for example, of glass.
  • a voltage of 0 to 400 v. may be applied to the three grid members which constitute the control grid G1
  • a voltage of 0 to 500 v. may be applied to the control grid G2
  • a voltage of 13 to 20 kv. may be applied to the electrodes G3 and G5
  • a voltage of 0 to 400 ⁇ v. may be applied to the electrode G4, all using the voltage of cathode K as the reference voltage.
  • the respective voltage distributions of the grids G1 and G2 and the electrodes G3, G4 and G5, and the respective lengths and diameters thereof, will be substantially identical with those of a unipotential single-beam type electron gun which includes a single, rst grid member and a second grid provided with a single aperture.
  • an electron lens field is established between grid G2 and the end 18 of electrode G3, and this electron lens eld will form the equivalent of an auxiliary lens as indicated in dashed lines at L'.
  • an electron lens teld which is the equivalent of a main lens as indicated in dashed lines at L is formed on the axis of electrode G4 by the electrodes G3, G4 and G5.
  • bias voltages of v., 0 v., 300 v., 2O kv., 200 v., and 20 kv. are applied to the electrode K, the control grids Gl and G2, and the electrodes G3, G4 and G5, respectively.
  • the electron gun A of FIG. 1 further comprises deiiecting means F which include shielding plates P and P', disposed as shown in spaced, opposed relationship, and beam-converging deflector plates Q and Q' which are respectively disposed as shown in spaced, opposed relation to the outer shielding plate surfaces.
  • the shielding plates P and P', and the deflector plates Q and Q' are disposed so that the electron beams BR, BG and BR pass respective'y between the plates P and Q, between the plates P and P', and between the plates P and Q.
  • a voltage VP which is equal to the voltage applied to the electrode G5
  • a voltage VQ which is lower by 200 v. to 300 v. than the voltage applied to the shielding plates P and P', is applied to the detlector plates Qand Q.
  • a voltage diierence or detiecting voltage VG will be applied between the plates P and Q and between the plates P' and Q', respectively, to impart the requisite deflecting action to the electron beams BR and BB.
  • the three electron I Ibeams BR, BG and BB will emanate from the cathode K to pass respectively through the grid member apertures glR, glG, and g1B,'and will be modulated by the red "green and blue video signals which are applied between the cathode K and the grid members G1R, GIG and G1R, respectively.
  • the electron beams BR, BG and BB are then passed through the auxiliary lens as indicated at L' and will then intersect each other at the center of the main lens L. Thereafter, the electron beams BR, BG and BB will tbe passed respectively between the plates Q and P, between the plates P and P', and between the plates P' and Q.
  • the color phosphor screen S is similar to color screens of the chromatron type and is formed by a successive arrangement of sets of red, green and blue phosphor stripes SR, SG and SB each of which sets constitutes a color picture element.
  • a screen grid GP Spaced as shown from the screen S is a screen grid GP comprising grid wires gp pairs of which are disposed as shown in general alignment with the sets of the respective phosphor stripes SR, SG and SB.
  • a relatively high, post-focussing voltage VM is applied as indicated to the screen grid GP.
  • the voltage VM is lower than the voltages applied to the electrodes G3 and G5, and the shielding plates P and P', but is sufficiently high, as for example 5 kv. to 7 kv., to operate the grid GR.
  • the electron beams BR, BG and BB converge as shown at a predetermined angle at a common spot between the two grid wires gp of a grid wire pair and diverge therefrom in such manner that the electron beam BR strikes the red phosphor stripe SR, the electron beam BG strikes the green phosphor stripe SG, and the electron beam BB strikes the blue phosphor stripe SB.
  • the said cornmon spot may be understood to correspond to the depicted set of phosphor stripes.
  • Non-illustrated horizontal and vertical electron lbeam deilection means would, of course, be provided intermediate the neck portion of the non-illustrated cathode ray tube structure to effect electron beam scanning of the color phosphor screen S in conventional manner.
  • the electron beams BB, BG and BB are focused by the passage thereof through the center of the main lens L whereby the beams will be substantially unaffected by coma and/ or astigmatism of the said main lens to thus substantially prevent the blurring of the beam spots on the color phosphor screen S.
  • the distance between the grid GB and the color phosphor screen S will be predetermined by the axial length of the non-illustrated cathode ray tube face portion. In order to achieve accurate correspondence between the respective grid wire gp and phosphor stripe set positions, it is desirable that the said predetermined distance be made as small as possible.
  • any decrease in this predetermined distance must be accompanied by an increase in the respective incident angles of the electron beams BB and BB with respect to the grid G, More specifically, and as now described in detail with reference to the optical analogy diagram of FIG. 2, the following conditions should be satisfied:
  • l1 is the distance between the central plane 20 of the decctor means F and the central plane 21 of the grid GP; I2 is the distance between the central plane 21 and the color phosphor screen S; d is the width of the respective color phosphor stripes; D is the distance between the points at which the electron beams BB and BB pass through the central plane and the point at which the electron beam BG passes therethrough; and PT is the distance between adjacent grid wires gp, otherwise referred to as the screen grid pitch.
  • the distance D must be Ancreased since each of l2 and l1 are inversely proportional to D. If I3 is the distance between the plane 22 of the cathode face 12 and the central plane 23 of the main lens L; 1.1 is the distance between the respective central planes 23 and 20; and the angle 0 is the angle between either of the electron beams BR or BB with respect t0 electron beam BG, it then becomes clear that the distance ID can only be increased by increasing either of 0 or I4.
  • any deviation in the distance l2 from its predetermined value or deviation in the position of the central plane 20 will result, for example, in shifting of the electron beams BR and BG to the extent that the same may tend to respectively strike the green phosphor stripe SG or the red phosphor stripe SB of the adjacent phosphor stripe sets with highly disadvantageous result as should be obvious, and this will occur despite adjustment of the convergence voltage which is applied to the convergence dellector means F to provide the possible electron beam convergence.
  • FIG. 3 there is shown therein an embodiment of the color picture tube system of this invention, as indicated generally at 30, which includes a chromatron type color picture tube of the single-gun, three-beam type as described hereinabove with regard to the prior art color tube system of FIG. l.
  • the electron gun is indicated generally at A1 and has a construction similar to that of the electron gun A of FIG. 1. Accordingly, corresponding parts will be identied with corresponding reference symbols whereby it may be understood that electron gun A1 comprises, in the manner of electron gun A, a cathode K, control grids G1 and G2, and electrodes G2, G1 and G5.
  • Voltages based as before on the cathode voltages, which are equal to those described with reference to FIG. l are applied to the control grids G1 and G2 and the electrodes G2, G4 and G5 of the electron gun A1 whereby the electron beams BB, BG and BB which emanate from the gun cathode K are passed through apertures gm, g1G, and g1B of the control grid G1, apertures g2B, g2G and gzB of the ycontrol grid G2, and then through the auxiliary lens L by which the electron -beams are converged at the optical center of the main lens L with the electron beams BB and BB emerging from the latter as before along divergent paths.
  • Electrodes P and P are spaced electrode plates P and P between which the electron beam BG will pass.
  • electrode plates Q1 and Q1 are disposed as shown in spaced, opposed relationship with the outer faces of the electrode plates P and P.
  • the electron beams BB and BB will pass respectively between the electrode plates P and Q, and the electrode plates P and Q1.
  • Plates H and H are disposed as shown adjacent the respective electrode plates P and P' in opposed relationship with the outer faces of the latter, and electrode plates Q2 and Q2 are in turn disposed as shown in spaced manner from the outer faces of the plates H and H and in opposed relationship therewith.
  • the electron beams BB and BB will pass respectively between the plates H and Q2 and between the plates H and Q2.
  • the axial extent of the electrode plates Q2 and Q2 is made greater than the axial extent of the electrode plates Q1 and Q'1.
  • the electrode plates P and P are bent as shown so that the space therebetween increases gradually in the direction of the color phosphor screen S over a distance which extends from the area of the screen-side edges of the electrode plates Q1 and Q1 to the central area of the plates H and H.
  • the respective plates H and H and Q2 and Q2 are bent so as to maintain the respective inner faces thereof substantially parallel with the respective outer faces of electrode plates P and P'. This bending of the respective plates may, however, be rendered unnecessary by increase in the respective spacing therebetween.
  • the electrode plates P, P', Q2 and Q2 are electrically connected as shown to terminal TB to which is applied a voltage VP which is equal to the voltages applied to the electrodes G3 and G5 and will thus range from 13 kv. to 20 kv.
  • the plates H, H', Q1, and Q1 are electrically connected and coupled to a terminal TQ to which is applied a voltage V which exceeds the voltage VP by a voltage VC ranging from 200 v. to 300 v.
  • an equivalent convergence deilecting voltage source VS is connected as shown across the terminals TP and TQ.
  • the deflecting means F1 will include a rst deector f1 as constituted by the electrode plates P and P', P and Q1, and P and Q1, and a second deflector f2 as constituted by the electrode plates P ⁇ and P', H and Q2 and H and Q'2.
  • the respective rst and second deectors f1 and f2 are successively arranged as shown in the paths of the electron beams BR, BG ⁇ and BB.
  • the electron beams BR and BB will pass respectively between the plates P and Q1 and between the plates B and Q1 and will be deliected in divergent directions by the first deflector f1.
  • the electron beams BR and BB will be deflected in convergent directions by the second deflector f2.
  • the axial extent of the rst deector f1 is made greater than the axial extent of the second deector f2, and a difference in deflection sensitivity is provided therebetween so that the electron beams BR, BG and BB may again be converged at the common spot at the grid Gp.
  • the three electron beams BR, BG and BB will be intensity modulated, whereby a color picture is provided on the color phosphor screen S.
  • the distance Z2 is measured between the central plane 21 of the grid GP and the color phosphor screen S
  • the distance l is measured between the face 12 of the cathode K and the central plane 23 of the main lens L
  • the distance (I4-H1) is measured between the respective central planes 23 and 21,
  • the angle .0 between the respective electron beams prior to the mc1dence thereof on the central plane 24 of the first deiector f1 may be smaller than the corresponding electron beam angle of FIG.
  • the lens system of the electron gun 30 of FIG. 3 may be understood to apply a more uniform focussing action to the respective electron beams BB, BG and BR than does the prior art electron gun of FIG. 1. As a result, significant improvement in the resolution of the color picture produced on the color phosphor screen S of FIG. 3 is made possible.
  • the distance D in FIG. 4 as measured between the incidence points of the respective electron beams on the central plane 25 of the second ⁇ dellecting means f2 also becomes smaller than the similarly measured distance D of FIG. 1 whereby a more linear deliecting action for enabling the three electron beams to horizontally and vertically scan the color phosphor screen S will be imparted to the three electron beams which are, of course, subjected to the horizontal and vertical deflection action of the non-illustrated horizontal and vertical deflection coils after having passed through the Asecond deflector f2. Consequently, it becomes possible to effectively prevent any distortion of the picture produced on the said color phosphor screen.
  • the respective first and second deflectors f1 and f2 of the system 30 of FIG. 3 can be operated through the use of the voltages applied to the terminals Tp and TQ, the power supply circuit for the said deecting means will not be unduly complicated.
  • the electrode plates Q1, Q1, H and H are electrically connected with each other and coupled to the terminal TQ.
  • the electron gun is indicated generally at A2, the detlecting means at f2, the screen grid at GB, and the color phosphor screen at S, and the respective components thereof which are the same as the respective components of the embodiments of FIGS. 1 and 3 again bear the same identifying reference characters.
  • the convergence deectng means f2 again comprise first and second deflectors as indicated at f3 and f4.
  • the deflecting means f3 include spaced electrode plates Q1 and Q1 which are positioned as shown in opposed relationship with the outer surfaces of electrode plates P and P which are common to both of the said detlecting means
  • the deliector f4 comprises electrode plates Q2 and Q2 spaced as shown, and electrode plates H and H which are disposed on the outer surfaces of the electrode plates P and P', through the use of insulating material layers I and I', in opposed relationship with the inner surfaces of the electrode plates Q2 and Q2.
  • the central electron beam BG will pass substantially undellected between the electrode plates P and P', while the one side electron beam BB will pass between electrode plates B and Q1 and between the electrode plates H and Q2, and the other side electron beam BR will pass in turn between electrode plates P and Q1 and electrode plates H and Q2, respectively.
  • the electrode plates P and P and Q2 and Q'2 are connected as indicated to a terminal Tp to which is applied to voltage V.
  • the electrode plates Q1, Q1, H 'and H are coupled to a terminal T and a Voltage V2 from a power source VS is applied to the terminal T2 with the said voltage being equivalent to the voltage VG as described hereinabove with regard to the embodiment of FIG. 3.
  • the electron beams BR and BB will, in passing between the respective electrode plates P and Q1 and P and Q1, be deflected in divergent directions by the first deflector f3.
  • the electron beams BB and BB will be deliected in convergent directions to thus result in electron beam convergence as shown at the common spot rat the screen grid Gp.
  • a horizontal dynamic convergence effect could be provided in the embodiment of FIG. through the provision therein of a horizontal dynamic convergence voltage generating means.
  • the color tube system is indicated generally at 50
  • the electron gun is indicated at A2
  • the electron beam deilecting means at F2
  • the screen grid at GB and the color phosphor screen at S
  • the same components thereof again bear the same reference characters.
  • the embodiment of FIG. 6 differs from the embodiment of FIGS. 3 and 5 in that the deflecting means F3 of the former 'are of the magnetic, rather than the electrostatic, type.
  • the deecting means F3 include a magnetic shield member T which extends, in the manner of the spaced electrode plates P and P of FIG. 5, to be common to both of the first delector, as indicated at f5, ⁇ second deflector, as indicated at f6.
  • the magnetic shield member T is of generally rectangular conguration and is deiined respectively by right and left side wall plates 31 and 31', and by upper and lower plates 32 and 32.
  • the central electron beam BG passes through the -magnetic shield member T without being magnetically deflected.
  • each of FIGS. 6 and 7 will be seen to include, in many instances, a second set of component reference characters placed in parentheses and it is to be understood that this parenthesized second set of reference characters indicates a substantially identical component which lies directly behind the depicted component in each instance.
  • a second set of component reference characters placed in parentheses and it is to be understood that this parenthesized second set of reference characters indicates a substantially identical component which lies directly behind the depicted component in each instance.
  • a magnetic pole piece member M11 comprising a magnetic plate 33a extending substantially perpendicularly with respect to the side wall plate 31, and a magnetic plate 34a which is bent in such manner as to extend along the annular inner surface of the cathode ray tube neck portion, as indicated in broken lines at N, upwardly from the outer end of the magnetic plate 33a.
  • a magnetic pole piece member M12 which comprises a magnetic plate 33b disposed in opposition to the magnetic plate 33a, and a magnetic plate 34h which is bent in such manner as to extend along the inner surface of the cathode ray tube neck portion N downwardly from the outer end of the magnetic plate 33h.
  • a magnetic pole piece member M'11 which is coniigured in the same shape as the magnetic pole piece member M11 and comprises a magnetic plate 33a' land a magnetic plate 34a extending therefrom.
  • a magnetic pole piece member M12 coniigured in the same shape as the magnetic pole piece member M12 is yalso provided and comprises a magnetic plate 3311' and a magnetic plate 34b' extending therefrom.
  • magnetic pole members M21 and M22 At the color phosphor screen side of the magnetic shield member T, magnetic pole members M21 and M22, conigured in the same shape as the magnetic pole members M11 and M12, are provided adjacent the side wall plate 31 of the said magnetic shield member; and magnetic pole members M21 and M22, configured respectively in the same shapes as the magnetic pole members M11 and M'12, are provided adjacent the side Wall plate 31 of the magnetic shield member T.
  • An annular electromagnet C1 is provided around a part of cathode ray tube neck portion N and consists of a core 36 having a magnetic pole 35a disposed in opposed relationship with the plate 34a of the magnetic pole member M11, and a magnetic pole 35b disposed in opposed relationship with the plate 34h of the magnetic pole member M12, and a winding 37 which is wound as indicated on the core 36.
  • annular electromagent C1 is disposed to the other side of the said tube neck portion, and the former consists of a core 36 having magnetic .poles 35a and 35h disposed in opposed relationship with the plate 34a' of the magnetic pole member M11 and the plate 34h of the magnetic pole member M'12, respectively, and a winding 37 which is wound as shown on the core 36'.
  • annular electromagnet C2 Disposed around the neck portion end to the screen side thereof, is an annular electromagnet C2 which consists of a core having magnetic poles disposed in opposed relationship with the plate 34a of the magnetic pole piece member M21 and the plate 34h of the magnetic pole piece member M22, and a winding 37a is wound around this core.
  • An annular electromagnet ⁇ C2 is provided around a part of the neck portion to the screen side of the latter and consists of a core having magnetic poles disposed in opposed relationship to the plate 34a of the magnetic pole piece member M21 and the plate 34h of the magnetic pole piece member M22, and a winding 37a is wound around this core.
  • the electron beam BB will pass undeilected through the magnetic shield member T.
  • the electron beam BB will pass -between the plate 33a of the magnetic pole piece member M11 and the plate 33b of the magnetic pole piece member M12, and will then pass between the plate 33a of the magnetic pole piece member M21 and the plate 33b of the magnetic pole piece member M22.
  • the beam BB will pass between the plates 33a and 33b of the respective pole piece members M11 and M'12, and will then pass between the plates 33A and 33B of the respective magnetic pole members M21 and M22.
  • electromagnetic deiiecting means f5 which are functionally equivalent to the respective electrostatic dellectors f1 and f3 as described hereinabove with reference to the embodiments of FIGS. 3 and 5, will 'be constituted by the magnetic pole piece members M11, M12, M'11 and M'12, electromagnets C1 and C1, and magnetic shield member T.
  • electromagnetic deectors f6 which are the equivalent of the respective electrostatic deflectors f2 and f4 as described hereinabove with regard to the embodiments of FIGS. 3 and 5, will be formed by the magnetic pole members M21, M22, M21 and M'22, electromagnets C2 and C'2, and the magnetic shield member T.
  • a deecting current is supplied from an external source to the winding 37 of the electromagnet C1 to result in the formation of a proportional magnetic ield and the passage of the latter through the magnetic pole members M11 and M12 to apply the requisite deflecting action to the electron beam BB.
  • the current is applied to the electromagnet winding 37 in such direction as to elTect the divergent deection of the electron beam BB in its passage between the plates 33a and 33b.
  • a deecting current of the same magnitude is applied to the Winding 37 of the electromagnet C1 to provide the requisite magnetic iield through the magnetic pole members M11 and M'12 to impart the requisite divergent deection to the electron beam BB.
  • the color tube system is indicated generally at 60 and comprises an electron gun as indicated at A4, the electron beam defiecting means as indicated at F4, a screen grid as indicated at GP, and a color phosphor screen as indicated at S, with like components again being identified by like reference characters.
  • the deflecting means F4 include first and second deflectors f7 and f8 which are constituted by spaced electrode plates P and P', Q1 and Ql and Q2 and Q'z and do not, as in the embodiment of FIG. 5, include the additional electrode plates H and H and their associated insulators I and I. Too, in the embodiment of FIG. 8, the electrode plates Q2 and Q2 are connected as shown to a terminal TR rather than to the terminal TP as heretofore.
  • a voltage VR which is either substantially equal to or lower than the voltage V (FIGURE 5) is applied to the terminal TR from an equivalent power source VS which is similar to the power source VS.
  • the power source VS is connected as shown across the terminals TP and TR to effect the static defiection of the respective electron beams BB and BR in convergent directions in both of the first defiector f7 and the second defiector f8.
  • conventional horizontal dynamic convergence voltage generating means may be understood to be incorporated in the equivalent power sources VS and VS.
  • the voltage VQ and/ or the voltage VR are adjustable, through the adjustment of either one of the equivalent power sources VS and VS', to enable the correction of the position of the apparent deflection center of the deflection means F to a predetermined position with respect to the respective electron beams BB and BR.
  • the system of FIG. 8 it also becomes possible to correct the incident angles of the electron beams BR, BG and BB at the common spot with respect to the screen grid Gp.
  • Suitable modification could, of course, be made in the embodiment of FIG. 8 to achieve therein convergent, rather than divergent, defiection of the respective electron beams BB and BR in the first defiector f8 in the manner described hereinabove with regard to the embodiments of FIGS. 3 and 5.
  • the respective current flow directions of the deflecting currents supplied to the electromagnets C1 and C1 of the first defiector f5 may be arranged to be opposite to those described above to thus provide for the convergent deliection of the said electron means in both of the first deflector f5 and the second defiector f6 of the embodiment of FIG. 6.
  • three electrically independent cathodes may, in each of the disclosed embodiments of this invention, be substituted for the single cathode K.
  • the first grid G1 of the electron .gun has in each instance been described as being formed by electrically independent grid members G1R, GlG, and G1R, it is also lto be understood that a single grid member comprising three apertures may be readily substituted therefor.
  • the herein disclosed embodiments of this invention would all be equally applicable lto a color picture tube system utilizing a conventional shadow-mask type color picture tube wherein the screen grid G were replaced by a shadow-mask.
  • the herein as applied to a three-beam color picture tube it is to be understood equally applicable, with suitable modification, to use in conjunction with color picture tubes wherein two electron beams, or four or more electron beams, are utilized in the reproduction of color pictures.
  • a color picture tube system which includes a color screen, an electron gun means spaced therefrom, means for directing a plurality of electron beams toward said color screen, lens means for focussing said electron beams, and means for passing said electron beams through the optical center of said focussing lens means with one of said beams emerging therefrom along the optical axis of said focussing lens means and the other of said beams emerging therefrom along paths which are divergent thereto, the improvements comprising, electron beam deflecting means including first and second electron beam deflcctors which are arranged successively in the path of said electron beams from said electron gun means to said color screen, said electron beam defiecting means being operable to enable the undeflected passage therethrough of said one beam while defiecting said other beams so that all of said electron beams may be converged at a common spot corresponding to a color picture element on said color screen.
  • said first electron beam deflector deflects said other electron beams in convergent manner
  • said second electron beam deflector also defiects said other electron beams in convergent manner to thereby effect said electron beam convergence at said common spot.
  • each of said first and second electron beam deflectors comprises means for applying an electric field to said other electron beams to thus electrostatically defiect said other electron beams.
  • each of said first and second electron beam deflectors comprises means for applying a magnetic field to said other electron beams whereby the latter are magnetically deflected.
  • each of said first and second electron beam deflectors f includes means for applying an electric field to said other electron beams whereby, said other electron beams are electrostatically deflected.
  • each of said first and second electron beam defiectors includes means for applying a magnetic field to said other electron beams whereby said other electron beams are magnetically defiected.
  • each of said first and second electron beam defiectors includes means for applying an electric field to said other electron beams whereby, said other electron beams are electrostatically deflected.
  • said first and second electron beam deflectors comprise an adjustable deflecting voltage source connected thereto whereby, the extent of said other electron beam deflections may be controlled by adjustment of said adjustable detiecting voltage source.
  • said first and second electron beam deflectors comprise an adjustable deecting current source connected thereto whereby, the extent of said other electron beam deections may be adjusted by adjustment of said adjustable detlecting current source.
  • said first and second electron beam deectors comprise an adjustable detlecting voltage source connected thereto whereby, the extent of said electrostatic deflection of said other electron beams may be adjusted by adjustment of said adjustable deecting voltage source.
  • said rst electron beam deector comprises an adjustable deflecting voltage source connected thereto
  • said second electron beam deflector comprises another adjustable voltage source connected thereto whereby, the respective electrostatic deilections of said other electron beams may be adjusted by adjustment of said adjustable voltage source and said another adjustable voltage source, respectively.

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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)
US718738A 1967-04-06 1968-04-04 Color picture tube Expired - Lifetime US3467881A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2217467 1967-04-06
JP2217367 1967-04-06
JP4625367 1967-07-19

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US3467881A true US3467881A (en) 1969-09-16

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US718738A Expired - Lifetime US3467881A (en) 1967-04-06 1968-04-04 Color picture tube

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US (1) US3467881A (de)
DE (1) DE1762109B2 (de)
FR (1) FR1573166A (de)
GB (1) GB1217240A (de)
NL (1) NL155703B (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3571645A (en) * 1968-04-14 1971-03-23 Sony Corp Color picture tube with mounting means for electrostatic beam convergence plates
US3579008A (en) * 1968-04-13 1971-05-18 Sony Corp Color tube having asymetrical electrostatic convergence correction system
US3617790A (en) * 1968-04-10 1971-11-02 Rank Organisation Ltd Shadow-mask type color television tube with screening electrodes for converging the electron beams on the shadow mask
US3619687A (en) * 1968-04-14 1971-11-09 Sony Corp Color tv tube having curved convergence deflection plates
US3651369A (en) * 1968-11-13 1972-03-21 Sony Corp Cathode ray tube
US3778666A (en) * 1969-04-07 1973-12-11 Sony Corp Convergence deflecting device for single-gun, plural-beam color picture tube
US3860850A (en) * 1971-05-18 1975-01-14 Tokyo Shibaura Electric Co Color cathode ray tube with color raster displacement correction
US4772826A (en) * 1986-06-26 1988-09-20 Rca Licensing Corporation Color display system

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2609431A1 (de) * 1976-03-06 1977-09-08 Licentia Gmbh Farbbildkathodenstrahlroehre
JPS58154143A (ja) * 1982-03-10 1983-09-13 Sony Corp 複ビ−ム電子銃
US4933598A (en) * 1986-12-27 1990-06-12 Sony Corporation Cathode-ray tube with internal insulated electrical conductors
JP2595948B2 (ja) * 1986-12-27 1997-04-02 ソニー株式会社 陰極線管

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2197523A (en) * 1936-07-31 1940-04-16 Gen Electric Cathode ray tube
US2679614A (en) * 1952-09-17 1954-05-25 Rca Corp Beam-controlling system for tricolor kinescopes
US2922073A (en) * 1955-03-22 1960-01-19 Kendon Electronics Inc Color reproduction systems of the cathode ray tube type

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2197523A (en) * 1936-07-31 1940-04-16 Gen Electric Cathode ray tube
US2679614A (en) * 1952-09-17 1954-05-25 Rca Corp Beam-controlling system for tricolor kinescopes
US2922073A (en) * 1955-03-22 1960-01-19 Kendon Electronics Inc Color reproduction systems of the cathode ray tube type

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3617790A (en) * 1968-04-10 1971-11-02 Rank Organisation Ltd Shadow-mask type color television tube with screening electrodes for converging the electron beams on the shadow mask
US3579008A (en) * 1968-04-13 1971-05-18 Sony Corp Color tube having asymetrical electrostatic convergence correction system
US3571645A (en) * 1968-04-14 1971-03-23 Sony Corp Color picture tube with mounting means for electrostatic beam convergence plates
US3619687A (en) * 1968-04-14 1971-11-09 Sony Corp Color tv tube having curved convergence deflection plates
US3651369A (en) * 1968-11-13 1972-03-21 Sony Corp Cathode ray tube
US3778666A (en) * 1969-04-07 1973-12-11 Sony Corp Convergence deflecting device for single-gun, plural-beam color picture tube
US3860850A (en) * 1971-05-18 1975-01-14 Tokyo Shibaura Electric Co Color cathode ray tube with color raster displacement correction
US4772826A (en) * 1986-06-26 1988-09-20 Rca Licensing Corporation Color display system

Also Published As

Publication number Publication date
NL6804852A (de) 1968-10-07
FR1573166A (de) 1969-07-04
NL155703B (nl) 1978-01-16
DE1762109A1 (de) 1970-08-13
DE1762109B2 (de) 1972-02-10
GB1217240A (en) 1970-12-31

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