US3700954A - Color picture tube device - Google Patents

Color picture tube device Download PDF

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Publication number
US3700954A
US3700954A US3899A US3700954DA US3700954A US 3700954 A US3700954 A US 3700954A US 3899 A US3899 A US 3899A US 3700954D A US3700954D A US 3700954DA US 3700954 A US3700954 A US 3700954A
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United States
Prior art keywords
convergence
pole pieces
pole
picture tube
electrodes
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
US3899A
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English (en)
Inventor
Susumu Egawa
Shigeya Ashizaki
Katsumi Shimizu
Tosihiko Miyati
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority claimed from DE19702003116 external-priority patent/DE2003116C/de
Application granted granted Critical
Publication of US3700954A publication Critical patent/US3700954A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J29/702—Convergence correction arrangements therefor
    • H01J29/705—Dynamic convergence systems

Definitions

  • a color picture tube device having a blue convergence pole piece and a pair of red and green convergence pole pieces provided therein, wherein the red and green convergence pole pieces are disposed in opposing relationship to each other at an angle smaller than 120C, electrodes are provided such that each is in parallel with each of the pair of pole pieces respectively, red and green beams being made to pass between the electrodes and the pair of pole pieces so that three, red, blue and green, beams may be moved on the screen with an angle of 120 being maintained therebetween.
  • This invention relates to a color picture tube device.
  • the convergence yoke attached to the picture tube 5 is constructed in the form of a double-pole, without any modifications to convergence pole pieces 6, 6' and 6" and portions related thereto (referred to as the top unit) provided in the picture tube, as shown in FIG. 1.
  • Such a device is disclosed in U.S. Pat. Nos. 3,454,807 and 3,461,341, wherein static red and green convergence is simultaneously effected by means of a single magnet 2 and a dynamic one is also simultaneously effected by means of a single magnet 4.
  • Numerals 1 and 3 represent static and dynamic blue convergence magnets respectively, and 7 a shield plate.
  • FIG. 2 The magnetic field distribution occurring in the foregoing system is as shown in FIG. 2. That is, the magnetic fields in those portions (indicated by R G B of the top unit through which electron beams pass turn out to be approximately perpendicular so that forces imparted to the beams R and G or motions thereof are directed as shown by the arrow marks, and consequently these beams tend to be deviated from their desired directions (indicated by A and A respectively in FIG. 2).
  • the extent to which the dots are scattered on the screen prior to the dynamic convergence (misconvergence) in the periphery of the screen is as shown by R and G in FIG. 3 for example. This has no relation to blue, and therefore the description related thereto will be omitted.
  • FIG. 3 This has no relation to blue, and therefore the description related thereto will be omitted.
  • FIG. 3a shows a desired form of convergence, wherein vectors r and g indicate AMP components respectively, most the misconvergence is corrected by adjusting said components, and the remainder d is corrected by DIFF (differential) components r and g P indicates a position where R and G dots are in registry with each other.
  • FIG. 3b corresponds to the magnetic field distribution shown in FIG. 2, wherein the amount of the remainder d corrected with respect to the AMP components r, and g, remains unchanged, but the required amount of differential correction r and g is remarkably increased.
  • the angle is smaller than 30.
  • the registry point P is greatly deviated from the horizontal center point between R and G, thus resulting in increased misconvergence with blue. Due to the electrode construction and/or configuration of external electromagnet (convergence yoke core), vertical misconvergence shown in FIG. 30 (misconvergence which is to be differentially corrected) becomes impossible when the moving directions of the beams R and G approach the horizontal direction.
  • the present invention is intended to eliminate the aforementioned drawbacks.
  • Another object of the present invention is to provide an electrode structure which is conveniently adapted to achieve the foregoing object.
  • FIG. 1 is a plan view, partly in section, showing the aforementioned conventional picture tube for color television receivers;
  • FIG. 2 is a view showing the magnetic field distribution occurring in said picture tube
  • FIGS. 3a, 3b and 3c are vector views useful for explaining the operation of FIG. 2, respectively;
  • FIG. 4 is a view showing the electrode structure of the color picture tube and magnetic field distribution occurring therein, according to an embodiment of the present invention
  • FIG. 5 is a view showing the electrode structure according to a second embodiment of the present invention.
  • FIG. 6 is a view showing characteristics useful for explaining the picture tube shown in FIG. 4.
  • the gist of the present invention resides in the formation of pole pieces exclusively adapted for two-pole convergence which are designed so that the magnetic reluctance of the magnetic paths for convergence is minimized by utilizing the fact that none of the magnetic fields passing through the intermediate portion R between parallel electrodes K and K and the intermediate portion G between parallel electrodes L and L respectively has substantially any component perpendicular to the electrodes K and K.
  • Numeral 8 represents a blue dynamic convergence magnet, 9 red and green dynamic convergence magnets, 10 a picture tube, and 11 a blue pole piece. These elements are similar in construction to those of the conventional device shown in FIG. 1.
  • pair of red green pole pieces 12 is substituted for the two pole pieces 6 and 6 shown in FIG. 1, and the pole pieces K and L of the pair of pole pieces 12 are disposed in opposing relationship to each other with an angle of a maintained therebetween.
  • the Y- shaped shield plate shown in FIG. 1 is constructed in the form of a V-shaped shield plate 13 so as to contain the blue pole piece therein. This shield plate 13 serves as a magnetic guide. Mounted on the shield plate 13 are the electrodes K and L disposed in opposing relationship to the pole pieces K and L of the pair of pole pieces 12 so that beams G and R are made to pass between the electrode the pole piece L and L and between K and K respectively.
  • the electrode spacing I be selected as small as possible from the standpoint of convergence sensitivity but as great as possible from the standpoint of tolerance for the electron beam thickness. Generally, this spacing is selected to be about mm. As will be seen from FIG. 6, a may be selected to be great for the case where the spacing is small while it may be selected to be small for the case where the spacing is great. Assuming that the configuration can be arbitrarily selected completely independently of the conventional top unit, another embodiment such as shown in FIG. 5 will become possible wherein magnetic lines of force pass substantially at right angles with respect to the desired beam moving directions A and A Provision of a magnetic shield plate between B and R, G is effective to reduce mutual interference between B and R, G. Parts of FIG. 5 corresponding to those of FIG. 4 are indicated by like numerals.
  • the shield plate 13 is formed by a single flat plate, and electrodes L and K are integrally formed in a substantially U-shaped section.
  • cores 8 and 9 are provided in opposing relationship to the pole piece 11 and the pair of pole pieces 12 respectively, so that static and dynamic convergence operations can be performed as in the conventional devices of this type.
  • differential control correction for longitudinal deviations of R, G
  • the aforementioned core 9 is U-shaped and has dynamic convergence windings provided on the opposite legs thereof. These windings are connected in series with each other through which a parabolic current is made to flow. A differential current may be supplied to the connection point between the windings.
  • a winding may be provided on the core in such a manner as to cover both of the legs thereof, and a current may be made to flow therethrough.
  • dynamic convergence windings are also provided on the opposite legs of the aforementioned core 8 .
  • rotatable and upwardly-downwardly movable magnets which are two-pole-magnetized are provided on the cores 8 and 9 thereby to effect static convergence control. All the foregoing elements are provided to apply magnetic fields for convergence control to the pole piece 11 and the pair of pole pieces 12.
  • a convergence device for use with a picture tube having an electron gun of the delta type comprising a first convergence pole piece for controlling a first electron beam
  • second and third convergence pole pieces for controlling second and third electron beams respectively, said second and third convergence pole pieces being positioned at a predetermined angle with respect to each other,
  • first and second electrodes positioned in a spaced, substantially parallel relationship with said second and third pole pieces respectively, said second electron beam bein inte psosed between said second pole piece an said t electrode and said third electron beam being interposed between said third pole piece and said second electrode, said convergence pole pieces and said electrodes being mounted within said picture tube, and
  • means located external to said picture tube of providing convergence controlling magnetic fields to said first, second and third pole pieces in opposing relationship to said pole pieces, the predetermined angle between said second and third convergence pole pieces being determined so that the three electron beams can be moved with an angle of being maintained therebetween.
  • a convergence device as defined by claim 1 which further comprises a shield plate provided within said tube between said first pole piece and said second and third pole pieces to prevent interference between said first pole piece and said second and third pole pieces.
  • a convergence device for use with a picture tube having an electron gun of the delta type comprising a first convergence pole piece for controlling a first electron beam
  • second and third convergence pole pieces for controlling second and third electron beams respectively, said second and third convergence pole pieces being positioned at a predetermined angle with respect to each other, and
  • first and second electrodes positioned in a spaced

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  • Video Image Reproduction Devices For Color Tv Systems (AREA)
US3899A 1970-01-19 1970-01-19 Color picture tube device Expired - Lifetime US3700954A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US389970A 1970-01-19 1970-01-19
GB258470 1970-01-19
DE19702003116 DE2003116C (de) 1970-01-23 Konvergenzvorrichtung für Farbbildröhren
NL707001155A NL148184B (nl) 1970-01-19 1970-01-27 Kleurentelevisieweergeefinrichting, alsmede kleurentelevisieweergeefbuis, bestemd om hierin als onderdeel te worden toegepast.
FR7002992A FR2033776A5 (enrdf_load_stackoverflow) 1970-01-19 1970-01-28

Publications (1)

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US3700954A true US3700954A (en) 1972-10-24

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Application Number Title Priority Date Filing Date
US3899A Expired - Lifetime US3700954A (en) 1970-01-19 1970-01-19 Color picture tube device

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Country Link
US (1) US3700954A (enrdf_load_stackoverflow)
FR (1) FR2033776A5 (enrdf_load_stackoverflow)
GB (1) GB1295884A (enrdf_load_stackoverflow)
NL (1) NL148184B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4633143A (en) * 1983-05-31 1986-12-30 Sperry Corporation Convergence correction apparatus for delta-gun color cathode ray tube displays

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3375389A (en) * 1965-03-15 1968-03-26 Rca Corp Adjustable convergence magnets
US3461341A (en) * 1967-12-11 1969-08-12 Matsushita Electric Industrial Co Ltd Dynamic convergence device for three electron gun color television receiver

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3375389A (en) * 1965-03-15 1968-03-26 Rca Corp Adjustable convergence magnets
US3461341A (en) * 1967-12-11 1969-08-12 Matsushita Electric Industrial Co Ltd Dynamic convergence device for three electron gun color television receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4633143A (en) * 1983-05-31 1986-12-30 Sperry Corporation Convergence correction apparatus for delta-gun color cathode ray tube displays

Also Published As

Publication number Publication date
NL7001155A (enrdf_load_stackoverflow) 1971-07-29
GB1295884A (enrdf_load_stackoverflow) 1972-11-08
NL148184B (nl) 1975-12-15
DE2003116B2 (de) 1972-06-22
DE2003116A1 (de) 1971-07-29
FR2033776A5 (enrdf_load_stackoverflow) 1970-12-04

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