EP0090989B1 - Optique électronique du canon à électrons d'un tube-image couleur - Google Patents

Optique électronique du canon à électrons d'un tube-image couleur Download PDF

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Publication number
EP0090989B1
EP0090989B1 EP83102719A EP83102719A EP0090989B1 EP 0090989 B1 EP0090989 B1 EP 0090989B1 EP 83102719 A EP83102719 A EP 83102719A EP 83102719 A EP83102719 A EP 83102719A EP 0090989 B1 EP0090989 B1 EP 0090989B1
Authority
EP
European Patent Office
Prior art keywords
electron
electron beams
parts
electrode
pot
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
Application number
EP83102719A
Other languages
German (de)
English (en)
Other versions
EP0090989A3 (en
EP0090989A2 (fr
Inventor
Norbert Staub
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.)
Nokia Deutschland GmbH
Original Assignee
Standard Elektrik Lorenz AG
Nokia Graetz GmbH
Alcatel NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Standard Elektrik Lorenz AG, Nokia Graetz GmbH, Alcatel NV filed Critical Standard Elektrik Lorenz AG
Publication of EP0090989A2 publication Critical patent/EP0090989A2/fr
Publication of EP0090989A3 publication Critical patent/EP0090989A3/de
Application granted granted Critical
Publication of EP0090989B1 publication Critical patent/EP0090989B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
    • H01J29/503—Three or more guns, the axes of which lay in a common plane

Definitions

  • the invention relates to electron optics for shaping and accelerating the electron beams of the electron gun system of a color television tube.
  • the electron gun systems consisted of identical rotationally symmetrical electrodes for each electron beam arranged side by side. Later, in the so-called “unitize d gun", in the electrode structure of which the single electrodes are combined, adjacent, rotationally symmetrical electrodes of the same function were combined to form a common electrode for all beams.
  • Such electrodes are asymmetrical, so that they represent a different environment for the outer and center beam. It is therefore customary to reduce these differences in the electrodes of the main focusing lens, which are also called grids 3 and 4, by means of an individual ring provided for each of the three electron beams.
  • the three rings are fastened next to one another in an electrode part which surrounds them and is designed as a pot-shaped casing.
  • the rotational symmetry is therefore approximately present in the interior of these electrodes for the individual electron beams, but when entering and exiting from the area of the rings, the center and outside beams have different environments.
  • the shape of the electrostatic focusing field is not completely rotationally symmetrical and this to a different degree for center and outside beams.
  • a color television tube with an electron gun system which has two sheet-shaped parts for coma correction in the convergence pot of the convergence electrode. These two parts have a U-shaped shape and extend only in one plane perpendicular to the direction of the electron beams. They are attached to the side of the bottom of the convergence pot facing the screen in such a way that the central electron beam is delimited by the central pieces of the two U-shaped parts and the outer electron beams are each encompassed by the legs of the parts. Both parts are made of ferromagnetic material.
  • GB-A-2 027 269 discloses an inline electron gun system for a color television tube, each of which has a focusing and convergence electrode provided with a cup-shaped casing.
  • the bottoms of the shells lie opposite each other and a U-shaped shielding or field shaping device is arranged around the openings for the electron beams in the bottoms and configured as passages.
  • This shielding or field shaping device only extend parallel to the electron beams and their legs are adjacent to two electron beams.
  • the area connecting the two legs is in each case fastened to the side wall of the pot-shaped casing of the focusing or converging electrode, which runs parallel to the electron beams.
  • the invention has for its object to provide a shielding or field shaping device by means of which the rotational symmetry of the focusing fields in the area of the focusing electrode is largely established and the deflection field is changed so that an effect on all three beams is made more uniform.
  • the invention is based on the basic idea that the unequal action of the electron optics on the center and outer beams can be eliminated more thoroughly by introducing complementary asymmetries with the help of free parameters, i.e. in a compensatory manner, than can be done by measures to expand and supplement the symmetry in the electrode structure would. It has been found that such improvements in the properties of the focusing lens result if the rotational symmetry of the electrostatic field acting on the electron beams in the focusing electrode is left in a certain way and to a certain extent. It has been shown that the stretching. of the originally rotationally symmetrical fields reduces the twist effect.
  • twist is understood to mean the angle on the screen between the horizontal and the lines written by the three electron beams in the case of horizontal deflection by the magnetic field of the deflection yoke. Differences in the system components also have a weaker effect on the focus voltage.
  • the sharpness voltage is understood to be the voltage against the ground potential at the “grating 3” at which the beam in question is focused on the screen. With the combined electrodes of a unitized gun, the “grid 3” voltage can no longer be set individually for each beam, which is why high demands must be placed on the equality of the focusing fields.
  • the simplification of the electrode on the "grating 4" side of the focusing lens which usually carries the field formers (shunts and enhancers) used to compensate for the magnetic deflection field, consists in that parts of the electrode itself are made of soft magnetic material, so that the The soft magnetic field formers welded onto the outer surface of the electrodes can be completely or partially dispensed with are. This brings a further simplification in the manufacture of the electron gun system.
  • the electrode with field former then no longer consists of eight but five, in the best case even only three parts.
  • FIGS. 1a to 1c A known electron gun system is shown schematically in FIGS. 1a to 1c.
  • the electrode labeled 5 "grid 3" and the electrode labeled 6 "grid 4".
  • the grating 4 (6) has a greatly different electrical potential than the grating 3 (5), so that an electrostatic focusing lens is formed between them.
  • the grids 3 and 4 have cup-shaped shells 3, in which the three identical parts 2 are present.
  • a board 1 can also be present in the grid 3.
  • FIG. 1b shows a top view of the grid 4 (6), the field formers 7 and 8 (shunts 7 and enhancers 8). These field-shaping means cause the magnetic deflection field of a deflection unit attached to the tube neck to act equally on the three electron beams passing through the openings 9. 4 is the so-called convergence pot.
  • Fig. 1c the grid 4 electrode is shown in cross section according to the section CD in Fig. 1.
  • the three identical parts 2 are clearly visible in the cup-shaped casing.
  • FIGS. 2a to 2c and 3a to 3c show two exemplary embodiments.
  • the parts 15 and 16 are at least partially made of magnetic material. These parts 15, 16 have, in order to be able to fulfill the task of field formation, flange-like, additional surfaces, by which they are supplemented so that they can take over the function of field formation. These surfaces run in planes perpendicular to the direction of the electron beams.
  • the parts 15, 16 are connected to the convergence pot 4 via these surfaces. Dimensions and shape are determined by calculation and experiment depending on the conditions of the electrode structure.
  • FIGS. 2a to 2c and 3a to 3c the cup-shaped shells have been omitted for the sake of clarity.
  • the areas of parts 15, 16 that run parallel to the electron beams can have dimensions that vary in height and / or thickness (not shown).

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Electron Beam Exposure (AREA)

Claims (3)

1. Optique électronique pour mettre en forme et accélérer les faisceaux électroniques du système générateur de faisceau électroniques d'un tube image de télévision couleur dans laquelle une électrode de concentration (5), associée à une électrode de convergence (6) formée d'une enveloppe en pot (3) et d'un pot de convergence (4), constitue une lentille de convergence principale, dans laquelle le corps de l'enveloppe (3) fait face à l'électrode de convergence (5), l'enveloppe (3) étant fixée par son côté ouvert au corps du pot de convergence (4) et l'enveloppe, tout comme du pot de convergence, présentant des ouvertures (9) pour les faisceaux électroniques, et dans laquelle, dans le volume renfermé par l'enveloppe (3) sur le pot de convergence (4), sont fixés des dispositifs de blindage"et de mise en forme de champ (15, 16), lesquels comportent des parties parallèles au plan dans lequel s'étendent les faisceaux électroniques et des parties perpendiculaires au plan dans lequel s'étendent les faisceaux électroniques, et sont faits, en totalité ou en partie, d'un matériau magnétique doux.
2. Optique électronique selon à la revendication 1, caractérisée en ce que les parties (15, 16) sont fixées par leurs surfaces s'étendant dans des plans perpendiculaires à la direction des faisceaux électroniques.
3. Optique électronique selon à la revendication 1, caractérisée en ce que les parties (15, 16) possèdent des dimensions qui varient en hauteur ou épaisseur parallèlement aux faisceaux électroniques.
EP83102719A 1982-04-02 1983-03-18 Optique électronique du canon à électrons d'un tube-image couleur Expired EP0090989B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3212248 1982-04-02
DE19823212248 DE3212248A1 (de) 1982-04-02 1982-04-02 Elektronenoptik des elektronenstrahlerzeugersystems einer farbbildroehre

Publications (3)

Publication Number Publication Date
EP0090989A2 EP0090989A2 (fr) 1983-10-12
EP0090989A3 EP0090989A3 (en) 1984-09-12
EP0090989B1 true EP0090989B1 (fr) 1988-07-06

Family

ID=6160034

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83102719A Expired EP0090989B1 (fr) 1982-04-02 1983-03-18 Optique électronique du canon à électrons d'un tube-image couleur

Country Status (5)

Country Link
US (1) US4682073A (fr)
EP (1) EP0090989B1 (fr)
JP (1) JPS58184243A (fr)
CA (1) CA1222276A (fr)
DE (2) DE3212248A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8402303A (nl) * 1984-07-20 1986-02-17 Philips Nv Kleurenbeeldbuis.
JP2661024B2 (ja) * 1986-12-27 1997-10-08 ソニー株式会社 陰極線管
TW392190B (en) * 1998-05-11 2000-06-01 Koninkl Philips Electronics Nv Cathode ray tube comprising an electron gun
KR100596229B1 (ko) * 1998-09-29 2006-09-20 엘지전자 주식회사 컬러 음극선관 전자총

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1195598A (en) * 1967-01-14 1970-06-17 Sony Corp Cathode Ray Tube
US3928785A (en) * 1971-11-23 1975-12-23 Adrian W Standaart Single gun, multi-screen, multi-beam, multi-color cathode ray tube
US3840765A (en) * 1972-09-26 1974-10-08 Tokyo Shibaura Electric Co Shielding member between only the control and side beams in a color cathode ray tube
US3866080A (en) * 1973-08-08 1975-02-11 Rca Corp Inline electron gun having magnetically permeable plates for enhancing convergence of electron beams
JPS5251863A (en) * 1975-10-22 1977-04-26 Mitsubishi Electric Corp Electronic gun for color picture tube
US4142131A (en) * 1975-11-12 1979-02-27 Hitachi, Ltd. Color picture tube
JPS5292473A (en) * 1976-01-30 1977-08-03 Mitsubishi Electric Corp Main lens electric field forming method of inline type 3 beam electron gun
NL7802129A (nl) * 1978-02-27 1979-08-29 Philips Nv Inrichting voor het weergeven van gekleurde beelden.
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
US4208610A (en) * 1978-06-09 1980-06-17 Zenith Radio Corporation Television picture tubes having an electron gun with aperture electrode shielding means
US4275332A (en) * 1978-07-25 1981-06-23 Matsushita Electronics Corporation In-line electron gun

Also Published As

Publication number Publication date
DE3377311D1 (en) 1988-08-11
US4682073A (en) 1987-07-21
EP0090989A3 (en) 1984-09-12
CA1222276A (fr) 1987-05-26
JPS58184243A (ja) 1983-10-27
DE3212248A1 (de) 1983-10-06
EP0090989A2 (fr) 1983-10-12

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