US3860850A - Color cathode ray tube with color raster displacement correction - Google Patents

Color cathode ray tube with color raster displacement correction Download PDF

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Publication number
US3860850A
US3860850A US253212A US25321272A US3860850A US 3860850 A US3860850 A US 3860850A US 253212 A US253212 A US 253212A US 25321272 A US25321272 A US 25321272A US 3860850 A US3860850 A US 3860850A
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United States
Prior art keywords
beams
cathode ray
ray tube
elements
electron
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Expired - Lifetime
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US253212A
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English (en)
Inventor
Shigeo Takenaka
Kazuhiko Idaka
Yuichi Sakamoto
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Toshiba Corp
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Tokyo Shibaura Electric Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/701—Systems for correcting deviation or convergence of a plurality of beams by means of magnetic fields at least
    • H01J29/707—Arrangements intimately associated with parts of the gun and co-operating with external magnetic excitation devices

Definitions

  • ABSTRACT ln a color cathode ray tube including a triple electron gun assembly composed of three electron gun units arranged in the same plane, there is provided an electron beam control means disposed in the deflection field which is produced by a deflection device so as to properly shield the electron beams of the electron gun assembly from a deflectionmagnetic field and control the respective deflection angles of' the electron beams.
  • FIG. 1 A first figure.
  • Such cathode ray tube comprises a funnel shaped envelope on the front side with a faceplate formed of a fluorescent screen; a triple electron gun assembly composed of three electron gun units arranged in the same plane and received in the neck section of the envelope; a deflection yoke for deflecting electron beams from the electron gun assembly so as to effectively scan the screen; and a convergence device fitted to the beam outlet of the electron gun assembly so as to register three rasters derived from scanning by three electron beams.
  • the vertical registration of rasters is effected by a deflection yoke for generating a regular pin cushion-shaped horizontal deflectionmagnetic field and a regular barrelshaped vertical deflection field.
  • the horizontal registration of rasters is attained by their dynamic convergence. Thus the rasters are fully registered all over the screen.
  • a color cathode ray tube comprises a funnel shaped envelope having neck and conical sections; a triple electron gun assembly received in the neck section; a faceplate coated with a color screen consisting of a plurality of groups of three fluorescent elementsproducing red, green and blue lights; and a shadow mask so disposed as to face the color screen.
  • Said triple electron gun assembly is formed of three electron gun units arranged in the same plane.
  • the convergence device has a convergence pole piece assembly mounted on the outlet portion of the electron gun assembly and a convergence coil assembly disposed around the section of the funnel shaped envelope.
  • a deflection yoke for deflecting electron beams from the electron guns.
  • an electron beam control means comprises first control member for decreasing the horizontal deflection angles of the side electron beams from the side electron gun units as compared with the similar deflection angle of the central electron beam from the central control gun unit and second control member for reducing to a vertical plane of the central electron beam as compared with the similar deflection angle of the side electron beams.
  • Addition of said control means enables the side rasters formed on the screen through scanning-by the side electron beams passing through said control means to be equally displaced from the central raster derived from the central electron beam. Such equal displacement of the side electron beams permits the introduction of convergence currents symmetrical with each other into the convergence device, thereby simplifying the arrangement of a circuit for generating said convergence currents.
  • FIG. 1 shows the arrangement of three rasters formed in a prior cathode ray tube where the electron beams are not subjected to dynamic convergence;
  • FIG. 2 illustrates the wave forms of convergence currents flowing through the conversence coil assembly of the prior art cathode ray tube
  • FIG. 3 is a sectional view of a cathode ray tube according to an embodiment of this invention.
  • FIG. 4 is a sectional view enlarged in part of the cathode ray tube of FIG. 3; g
  • FIG. 5 is a perspective view of an electron beam control means
  • FIG. 6 indicates the first control member of the electron beam control means: FIG. 6A is a front view and FIG. 6B is a plan view;
  • FIG. 7 shows the second control member of the electron control means;
  • FIG. 7A is a front view and
  • FIG. 7B is a plan view;
  • FIG. 8 presents the arrangement of rasters formed by electron beams passing through the first controlmeans
  • FIG. 9 illustrates the arrangement of rasters formed by electron beams passing through the second control member
  • FIG. 10 indicates the arrangement of rasters formed by electron beams conducted through both first and second control members
  • FIG. 1 1 shows the wave form of convergence current introduced through the convergence coil assembly of the cathode ray tube of this invention.
  • FIG. 12 illustrates an electron control means according to another embodiment of the invention: FIG. 12A is a perspective view and FIG. 12B is a front view.
  • the color cathode ray tube comprises a funnel shaped envelope 11 having a conical section 12 and a neck section 13; a faceplate l4 fitted to the front side of the envelope 1 l; a fluorescent color screen 15 formed of a plurality of groups of three fluorescent elements producing red, green and blue lights and coated on the inner wall of the faceplate 14; a shadow mask 16 disposed opposite to the screen 15; and an in-line type triple electron gun assembly 17 composed of three electron gun units 17R, 17G and 17B arranged in the same plane and received in the neck section 13.
  • the convergence device 18 includes a convergence pole piece assembly 19 mounted on the beam outlet portion of the electron gun assembly 17 and a convergence coil assembly 20 disposed around the periphery of the neck section 13 so as to surround the convergence pole piece assembly 19.
  • a deflection yoke 21 Around the boundary between the neck section 13 and the conical section 14 is fitted a deflection yoke 21 so as to deflect electron beams from the electron gun assembly 17.
  • This deflection yoke 21 generates a regular pin cushion-shaped horizontal deflection magnetic field and a regular barrel-shaped vertical deflection magnetic field.
  • a cathode ray tube according to this invention effectively acts on said deflection magnetic fields.
  • an electron beam control means 22 in an electron beam passageway defined between the electron gun assembly 17 and the deflection yoke 21, more particularly in the magnetic field created by the deflection yoke 21.
  • the electron beam control means 22 includes first and second control members 23 and 24.
  • the first control member 23 is formed of a pair of C-shaped (or U-shaped) elements 26 prepared from material of high magnetic permeability and, as shown in FIG. 6A, so .disposed as to surround the side beams 25B and 25R, with the open sides of said C-shaped (or U-shaped) elements 26 disposed opposite to each other.
  • the second control member 24 is composed of a pair of V-shaped elements 27 made of material of high magnetic permeability and, as shown in FIG. 7A, S disposed as to face each other with the electron beams 253, 25G and 25R allowed to pass therebetween.
  • the apices of the convex surfaces of said V- shaped elements 27 are positioned in the passageway of the central electron beam 25G.
  • the first control member 23 properly shields the side electron beams 25B and 25R from a horizontal deflection magnetic field, thereby decreasing the horizontal deflection angles of the side beams 25B and 25R from that of the central electron beam 25G. If the first control member 23 is formed with a suitable shape and size and properly positioned, then the side electron beams 25B and 25R will be desirably shielded from the horizontal magnetic field, thereby enabling the side rasters 28B and 28R (FIG. 8) resulting from scanning by the side beams 25B and 25R to be equally displaced on both sides of the screen from the central raster 28G derived from scanning by the central beam 25G.
  • the first control member 23 slightly shields the side electron beams 25B and 25R from a vertical deflection magnetic field, so that the side rasters 28B and 28R are morereduced in vertical width than the central raster 28G, thus presenting such a rasraster pattern of FIG. 1 as well as those forming the raster pattern of FIG. 8 or 9.
  • the position of the control means 22 with respect to the deflection yoke 21 is determined by computing from the following equations the distance 1. between the deflection yoke 21 and the first control member 23 and the distance L between the deflection yoke 21 and the second control member 24.
  • M denotes increases in the horizontal displacements of the side rasters over that of the central raster. Said increase represents a difference between the horizontal displacements of the side rasters from the central raster where the electron beams do not pass through the beam control means 22, and the ter pattern as shown in FIG. 8.
  • the second control member 24 increases the horizontal deflection angle of the central beam 25G over those of the side electron beams 25B and 25R with respect to the horizontal deflection magnetic field, and decreases the vertical deflection angle of the central electron beam 25G from those of the side electron beams 25B and 25R, thus obtaining such a raster pattern as illustrated in FIG. 9. If the second control member 24 is formed with a suitable shape and size and properly positioned, then the side rasters 29B and 29R will be equally displaced from the central raster 29G in a horizontal plane, causing the vertical width of the central raster 29G to be reduced to an extent equal to the contraction of the vertical width of the side rasters 29B and 29R resulting from their passage through the first control member 23.
  • the length C, width D and depth E of the elements 26 of the first control member 23 of FIG. 6 and the length F, width H and interspace K of the elements 27 of the second control member 24 of FIG. 7 are experimentally so determined as to cause the rasters to contain the various components constituting the horizontal displacements of the side rasters from the central raster where the electron beams are conducted through the beam control means 22.
  • N represents the increased or decreased vertical displacements .of the side rasters with respect to the central raster when determined in the same manner as the horizontal displacements; AM and AN show the variation of M and N with a 1 millimeter change of the distance between the diflection yoke 21 and the control means 22; the suffixes 1 and 2 correspond to the first and second control members 23 and 24; and S indicates the horizontal displacements of the side rasters from the central raster.
  • the shape, size and position of the first control member 23 are rigidly defined, it may be sufficient to attain equal horizontal displacements of the side rasters from the central raster. In fact, however, there take place the vertical displacements of the side raster so that provision of only the first control member 23 l 'ails to obtain a desired raster pattern. Accordingly, there is additionally used the second control member 24 so as to correct the arrangement of rasters derived from? the action of the first control member 23, thereby obtaining a desired raster pattern shown in FIG. 10. Such desired raster arrangement enables mutually symmetrical currents to be introduced through the convergence icoil assembly intended for full registration of the rasters, thus simplifying the construction of a convergence current generating circuit.
  • the C-shaped (or U-shaped) first control elements 26 surroundlthe side beams 25B and 25R respectively, with their closed end faces disposed opposite to each other.
  • the V- shaped second control elements 27 are so arranged that said first control elements 26 are disposed between the convex surfaces.
  • the apices of said convex surfaces are aligned with the passageway of the central beam 25G.
  • the firstand second control members 23 and 24 are disposed equidistant from the deflection yoke 21, thereby reducing the space occupied by the control means 22 in the neck section of the funnel shaped envelope 11 and in consequence the length of a cathode ray tube.
  • the aforesaid control means has to be so designed as to prevent the rasters from making prominent displacements even with said shifting of the deflection of yoke 21.
  • a color cathode ray tube comprising:
  • an envelope including a neck portion, a conical portion and a face plate
  • electron gun means for projecting a central electron beam and a pair of side electron beams, said beams being disposed in the same plane and being directed toward said fluorescent screen through horizontal and vertical deflection fields produced by an electromagnetic deflection yoke device;
  • electron beam control means for equalizing the sizes of the rasters produced by said electron beams on the screen, said electron beam control means being disposed adjacent the path of said electron beams and in the region of the horizontal and vertical deflection field between said electron gun means and said deflection yoke so as to cooperate with said deflection yoke to modify the flux distributions, and including:
  • a first control member including a pair of similarly shaped control elements of high magnetic permeability around respective side beams along a given length of travel of the side beams, said control elements shielding the side beams from both horizontal and vertical deflection fields to reduce both horizontal and vertical deflection flux acting on the side beams as compared with that acting on the central beam;
  • a second control member including a pair of control elements of high magnetic permeability and symmetrically located equidistantly above and below the plane of the beams and symmetrical with the first control elements, the elements of said second control member both being similarly shaped, said second control member being located to modify the flux distribution in the region of the central beam so as to enhance the horizontal deflection flux acting on the central beam as compared with that acting on the side beams and to modify the flux distribution in the region of the central beam so as to reduce the vertical deflection flux acting on the central beams as compared with that acting on the side beams.
  • the color cathode ray tube of claim 1 wherein said electron gun means has an outlet end for projecting said electron beam, said second control member is disposed near to the electron beam outlet end of the electron gun means and said first control member is separately juxtaposed to said second member on the side of said fluorescent screen.
  • the color cathode ray tube of claim 1 wherein said first control member comprises a pair of generally U- shaped elements and said second control member comprises a pair of convex elements, the apices of said convex elements being aligned in a plane which is directed in the travelling direction of the central beam and which is perpendicular to the plane of the beams.
  • said first control member comprises a pair of generally U- shaped elements respectively shielding said side beams with the open ends of said U-shaped elements mutually facing each other and with the upper and lower sides of said U-shaped elements terminating short of the central beam.
  • said second member comprises a pair of generally V-shaped elements facing each other with said beams passing therebetween, the apices of said V-shaped elements being directed toward each other and being positioned in the passageway of said central beam, the apices of said V-shaped elements being aligned in a plane which is directed in the travelling direction of the central beam and which is perpendicular to the plane of the beams.
  • said first control member comprises a pair of generally U- shaped elements respectively shielding said side beams, the open ends of said U-shaped elements being directed away from each other.
  • said second member comprises a pair of generally V-shaped elements facing each other with said beams passing therebetween, the apices of said V-shaped elements being directed toward each other and being positioned in the passageway of said central beam, the apices of said V-shaped elements being aligned in a planewhich is directed in the travelling direction of the central beam and which is perpendicular to the plane of the beams.

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US253212A 1971-05-18 1972-05-15 Color cathode ray tube with color raster displacement correction Expired - Lifetime US3860850A (en)

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JP46032975A JPS5126208B1 (de) 1971-05-18 1971-05-18

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JP (1) JPS5126208B1 (de)
DE (1) DE2224404C3 (de)
FR (1) FR2138110B1 (de)
GB (1) GB1335508A (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2907192A1 (de) * 1978-02-24 1979-08-30 Rca Corp Farbbildroehre mit verbessertem strahlerzeugungssystem
DE2917268A1 (de) * 1978-05-01 1979-11-08 Rca Corp Farbfernsehbildroehre mit inline- strahlerzeugungssystem
US4225804A (en) * 1978-04-22 1980-09-30 Gte Sylvania N.V. Cathode ray tube coma correction device
DE3043048A1 (de) * 1979-11-15 1981-09-03 RCA Corp., 10020 New York, N.Y. Inline-farbbildroehre
US4329618A (en) * 1980-05-29 1982-05-11 Rca Corporation Horizontal deflection enhancement for kinescopes
US4370593A (en) * 1980-12-30 1983-01-25 Rca Corporation In-line electron gun and method for modifying the same
US4547698A (en) * 1980-09-29 1985-10-15 Zenith Electronics Corporation Magnetic deflection field enhancer means for television CRT electron guns
US4556819A (en) * 1983-12-13 1985-12-03 Rca Corporation Color picture tube having inline electron gun with coma correction members
US4625145A (en) * 1983-10-06 1986-11-25 U.S. Philips Corporation Color display tube with magnetic field shaping means
US4656390A (en) * 1984-05-10 1987-04-07 Kabushiki Kaisha Toshiba Color picture tube device
US4730144A (en) * 1986-08-27 1988-03-08 Rca Corporation Color picture tube having inline electron gun with coma correction members
US4939414A (en) * 1987-03-25 1990-07-03 U.S. Philips Corporation Color cathode ray tube with magnetic field conducting plates within envelope
US5006754A (en) * 1982-11-18 1991-04-09 U.S. Philips Corporation Color display tube with magnetic field shaping plates

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7802129A (nl) * 1978-02-27 1979-08-29 Philips Nv Inrichting voor het weergeven van gekleurde beelden.
JPS56138402A (en) * 1980-03-31 1981-10-29 Ebara Corp Sealing device for rotary piston machine
JPS59119654A (ja) * 1982-12-24 1984-07-10 Matsushita Electronics Corp 受像管装置
CA1265838A (en) * 1985-06-12 1990-02-13 Albertus A.S. Sluyterman Colour television display tube with coma correction

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3467881A (en) * 1967-04-06 1969-09-16 Sony Corp Color picture tube
US3548249A (en) * 1968-02-05 1970-12-15 Sony Corp Color cathode ray tube of the pluralbeam,single electron gun type
US3594600A (en) * 1968-12-30 1971-07-20 Sony Corp Convergence means for a plural beam color picture tube

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE624849A (de) * 1961-05-08
NL286376A (de) * 1961-12-07
FR1392502A (fr) * 1963-10-30 1965-03-19 Cft Comp Fse Television Fonctionnement aux tubes récepteurs de télévision en couleurs

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3467881A (en) * 1967-04-06 1969-09-16 Sony Corp Color picture tube
US3548249A (en) * 1968-02-05 1970-12-15 Sony Corp Color cathode ray tube of the pluralbeam,single electron gun type
US3594600A (en) * 1968-12-30 1971-07-20 Sony Corp Convergence means for a plural beam color picture tube

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2907192A1 (de) * 1978-02-24 1979-08-30 Rca Corp Farbbildroehre mit verbessertem strahlerzeugungssystem
US4225804A (en) * 1978-04-22 1980-09-30 Gte Sylvania N.V. Cathode ray tube coma correction device
US4396862A (en) * 1978-05-01 1983-08-02 Rca Corporation Color picture tube with means for affecting magnetic deflection fields in electron gun area
DE2917268A1 (de) * 1978-05-01 1979-11-08 Rca Corp Farbfernsehbildroehre mit inline- strahlerzeugungssystem
DE3043048A1 (de) * 1979-11-15 1981-09-03 RCA Corp., 10020 New York, N.Y. Inline-farbbildroehre
US4634923A (en) * 1979-11-15 1987-01-06 Rca Corporation Color picture tube having improved electron gun
US4329618A (en) * 1980-05-29 1982-05-11 Rca Corporation Horizontal deflection enhancement for kinescopes
US4547698A (en) * 1980-09-29 1985-10-15 Zenith Electronics Corporation Magnetic deflection field enhancer means for television CRT electron guns
US4370593A (en) * 1980-12-30 1983-01-25 Rca Corporation In-line electron gun and method for modifying the same
US5006754A (en) * 1982-11-18 1991-04-09 U.S. Philips Corporation Color display tube with magnetic field shaping plates
US4625145A (en) * 1983-10-06 1986-11-25 U.S. Philips Corporation Color display tube with magnetic field shaping means
US4556819A (en) * 1983-12-13 1985-12-03 Rca Corporation Color picture tube having inline electron gun with coma correction members
US4656390A (en) * 1984-05-10 1987-04-07 Kabushiki Kaisha Toshiba Color picture tube device
US4730144A (en) * 1986-08-27 1988-03-08 Rca Corporation Color picture tube having inline electron gun with coma correction members
US4939414A (en) * 1987-03-25 1990-07-03 U.S. Philips Corporation Color cathode ray tube with magnetic field conducting plates within envelope

Also Published As

Publication number Publication date
GB1335508A (en) 1973-10-31
DE2224404C3 (de) 1982-05-19
DE2224404B2 (de) 1981-10-01
FR2138110B1 (de) 1980-02-15
DE2224404A1 (de) 1972-11-30
JPS5126208B1 (de) 1976-08-05
FR2138110A1 (de) 1972-12-29

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