EP0125949A1 - Farbfernsehröhre mit einer Korrektur von Komafehlern geringer Amplitude - Google Patents

Farbfernsehröhre mit einer Korrektur von Komafehlern geringer Amplitude Download PDF

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Publication number
EP0125949A1
EP0125949A1 EP84400706A EP84400706A EP0125949A1 EP 0125949 A1 EP0125949 A1 EP 0125949A1 EP 84400706 A EP84400706 A EP 84400706A EP 84400706 A EP84400706 A EP 84400706A EP 0125949 A1 EP0125949 A1 EP 0125949A1
Authority
EP
European Patent Office
Prior art keywords
plates
coma
correction
dimension
horizontal
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.)
Granted
Application number
EP84400706A
Other languages
English (en)
French (fr)
Other versions
EP0125949B1 (de
Inventor
Roger Pieri
Jacques Baudry
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.)
Videocolor SA
Original Assignee
Videocolor SA
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 Videocolor SA filed Critical Videocolor SA
Priority to AT84400706T priority Critical patent/ATE28012T1/de
Publication of EP0125949A1 publication Critical patent/EP0125949A1/de
Application granted granted Critical
Publication of EP0125949B1 publication Critical patent/EP0125949B1/de
Expired 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
    • H01J29/707—Arrangements intimately associated with parts of the gun and co-operating with external magnetic excitation devices
    • 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
    • H01J29/56—Arrangements for controlling cross-section of ray or beam; Arrangements for correcting aberration of beam, e.g. due to lenses

Definitions

  • the invention relates to a display tube, in particular a television, in color of the self-converging type with three beams of coplanar electrons.
  • tube here is meant the system constituted by the tube itself, the deflector and the electron beam generators.
  • color images are usually obtained using a screen covered with luminescent substances of three fundamental colors, generally red, green and blue, which are excited by three electron beams, one for each color. These beams converge on the screen and are moved in lines from left to right and from top to bottom.
  • the screen is made up of triads, that is, sets of three dots, luminescent substances of the three colors.
  • the light intensity (luminance) and the color of each point of the image to be reproduced are obtained by the intensity of excitation of each of the elements of the triad.
  • each electron beam reaches only the points of the color to which it is assigned, on the one hand the three beams have different directions and, on the other hand, a shadow mask is placed in front of the screen.
  • the displacement of the beams along lines which is called scanning, is produced by two variable magnetic fields which deflect the beams one in the horizontal direction and the other in the vertical direction. These magnetic fields are generated by electric currents of variable intensity flowing in coils called deflectors.
  • the magnetic field traversed by these beams must have a particular non-uniform configuration in the space, which is linked in particular to the rectangular and substantially planar shape of the screen and the coplanar arrangement of the beams.
  • the tube When convergence is obtained exclusively by the configuration of the magnetic field, the tube is said to be self-converging.
  • This autoconvergence is achieved mainly thanks to the shape of the windings of the deflector.
  • the conformation of these windings is generally not sufficient: there are usually convergence faults.
  • One of these is the so-called coma defect which results, in a tube with coplanar beams, by dimensions of the image produced by the central beam (generally green) different from the dimensions of the image produced by the lateral beams (red and blue). This defect is measured by the distance separating two adjacent vertical edges from the green and red-blue images and by the distance separating two adjacent horizontal edges from these images.
  • the invention relates to the case where the coma defect is of small amplitude, that is to say of the order of a millimeter or less, and of different directions in the horizontal (east-west) and vertical (north- south), the image (green) produced by the central beam being for example wider than the image produced by the lateral beams (red-blue) but of lower height than that of this image produced by the lateral beams.
  • the invention results from the observation that the magnetic pieces of coma correction known up to now are not suitable for the correction of this type of defect.
  • the magnetic elements consist of magnetic pads applied to the bottom of a cup constituting an electrode for outputting the electron guns, and which therefore has three openings for the passage of the bundles, two of these pellets having the shape of crowns or washers surrounding the openings provided for the lateral beams, two other pellets being elongated vertical bars placed on either side of the opening for the green central beam.
  • These magnetic elements are suitable for coma defects of large amplitude, 5 mm for example; but for faults of smaller amplitude they confer a correction of too high a value which causes a fault in the opposite direction.
  • the tube according to the invention is characterized in that the magnetic coma correction elements, which are also flat pads, with a plane perpendicular to the direction of the beams, consist of four rectangular pads, preferably all identical, associated with the lateral beams , two of these pellets being below these respective beams and the other two pellets above these same beams, the length and the width of each patch being chosen as a function of the respective values of the coma defects in vertical and horizontal direction to correct.
  • the magnetic coma correction elements which are also flat pads, with a plane perpendicular to the direction of the beams, consist of four rectangular pads, preferably all identical, associated with the lateral beams , two of these pellets being below these respective beams and the other two pellets above these same beams, the length and the width of each patch being chosen as a function of the respective values of the coma defects in vertical and horizontal direction to correct.
  • the fault correction is carried out in a particularly simple manner.
  • the correction means (or method) is easily adaptable from one type of tube to another because the length of each rectangular element is a direct function of the height of the coma defect to be corrected and, similarly, the width of each element is a direct function of the magnitude of the coma defect in the horizontal direction.
  • the sensitivity of the horizontal scanning is increased because, with the magnetic correction elements of the invention, the magnetic field of horizontal deflection is increased in particular for the lateral beams while the horn elements rection known so far decrease the sensitivity of horizontal scanning, that is to say require a higher power of the deflectors.
  • the color television tube 10 is of the type with a perforated mask 11 placed inside the tube in front of the screen 12 and with electron guns 13 producing three beams 14, 15 and 16 coplanar.
  • the central beam 14 is, in this example, that which is intended to excite the green phosphorus on the screen while the lateral beams 15 and 16 excite the blue and red phosphors respectively.
  • the displacement of these beams, in order to scan the screen 12, is carried out by supplying coils 17 of horizontal and vertical deflection which produce magnetic fields allowing the displacement of the three beams 14, 15, 16 respectively in horizontal and vertical directions.
  • the barrels 13 are arranged at the rear of the tube in the cylindrical part 18 called the neck.
  • the deflection coils 17 are arranged partly around the neck 18 and partly around the flared section 19 connecting the neck 18 to the slab 20 presenting the screen 12.
  • the deflector 17 is such that it practically ensures self-convergence, that is to say the convergence of the three beams 14, 15, 16 over the entire screen. However, there still remains the coma defect which is reflected on the screen (FIG. 2) by different dimensions of the images produced by the three beams.
  • the green central beam V 14 produces a rectangular image 21 while the blue lateral beams B and red R produce an image 22, also rectangular, narrower and higher than the image 21.
  • the vertical sides of the image 22 are therefore between the vertical sides of image 21, the distance d between two adjacent vertical sides of images 21 and 22 being, in the example (tube whose screen diagonal measures 51 cm), of the order of 0, 3 mm and the horizontal sides of image 21 are between the horizontal sides of image 22, the distance h between two neighboring horizontal sides in the example being of the order of 0.8 mm.
  • the magnetic field at the rear of the deflector 17 is modified, that is to say on the side of the barrels 13.
  • pellets or plates with high magnetic permeability are used which are supported by the last electrode 23 (FIGS. 3 and 4) of the barrels, that is to say the electrode facing the screen 12.
  • This electrode 23 has a cup shape with a cylindrical edge 25 and bottom 24 perpendicular to the axis 26 of the tube. This bottom is pierced with three holes or openings of coplanar axes lying in a plane passing through the horizontal axis of the screen.
  • the central hole 27 is intended to allow the green beam 14 to pass through while the lateral holes 28 and 29 allow the blue 15 and red beams to pass through 16.
  • the magnetic elements are welded to the bottom 24 of the cup 23. They consist of plates made of an iron-nickel alloy.
  • four rectangular plates 30, 31, 32, 33 are provided (made of "anhyster" at 48% nickel) above and below the openings 28 and 29.
  • the rectangular plate 30 is above the opening 28 with its large side 30 1 horizontal, the middle of this large side 30 1 being at the right of the axis of the hole 28 intended to allow the excitation beam of the blue phosphors to pass.
  • the perpendicular bisector on the side 30 1 passes through the center of the hole 28.
  • the plate 31 is below the hole 28, in a position symmetrical with the plate 30 relative to the center of the hole 28.
  • the plate 32 is disposed relative to the hole 29, like the plate 30 relative to the hole 28.
  • the plate 33 is arranged relative to the hole 29 like the plate 31 relative to the hole 28.
  • the axis of the hole 27 is 5.1 mm away from the axis of the hole 28 or 29 and the thickness of the plates is 0.25 mm.
  • the lines 40 of the vertical deflection magnetic field Vx are spaced from one another around the holes 28 and 29.
  • the vertical deflection magnetic field is therefore attenuated for the blue-red image.
  • the lines of vertical deflection field 41 are, around the hole 27, close to one another: the magnetic field of vertical deflection is therefore increased for the beam 14 of excitation of the green.
  • the correction is therefore obtained in the chosen direction: increase in the vertical deviation for the green and reduction in the vertical deviation for the blue and the red.
  • FIG. 5 also shows that the field lines 42 of horizontal deflection Hy are brought closer to each other around the holes 28 and 29. These lines of field of horizontal deflection are also brought closer to each other around the hole 27, but in a lesser extent.
  • the horizontal deflection magnetic field is therefore increased for the three excitation beams, but it is more increased for the blue and red phosphors than for the green.
  • the desired result is also obtained, that is to say a relative reduction in the horizontal deviation for green compared to the horizontal deviation for blue and red.
  • the curves 45, 46 and 47 are curves of variation of the horizontal defect d of coma as a function of the dimension A for three dimensions L, of values L0, L 1 and L 2 respectively .
  • Curves 48, 49 and 50 are similar to curves 45, 46 and 47 respectively, but for the defect h of vertical coma.
  • the plates according to the invention make it possible to reduce the power supply energy of the coils of horizontal deflection. In other words, unlike previous embodiments, the correction is not carried out to the detriment of the horizontal scanning sensitivity.
  • the long side of the plates 30 to 33 is horizontal, it should be noted that, as a variant, these long sides may have other directions, that is to say be oblique to the 'horizontal. In addition, these long sides are not necessarily all parallel to each other.
  • the elements 30 to 33 are simple plates without extension along the axis 26.

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Color Television Image Signal Generators (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Picture Signal Circuits (AREA)
EP84400706A 1983-04-18 1984-04-10 Farbfernsehröhre mit einer Korrektur von Komafehlern geringer Amplitude Expired EP0125949B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84400706T ATE28012T1 (de) 1983-04-18 1984-04-10 Farbfernsehroehre mit einer korrektur von komafehlern geringer amplitude.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8306312A FR2544548B1 (fr) 1983-04-18 1983-04-18 Tube de television en couleurs a correction de defauts de coma de faible amplitude
FR8306312 1983-04-18

Publications (2)

Publication Number Publication Date
EP0125949A1 true EP0125949A1 (de) 1984-11-21
EP0125949B1 EP0125949B1 (de) 1987-06-24

Family

ID=9287970

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84400706A Expired EP0125949B1 (de) 1983-04-18 1984-04-10 Farbfernsehröhre mit einer Korrektur von Komafehlern geringer Amplitude

Country Status (7)

Country Link
US (1) US4725757A (de)
EP (1) EP0125949B1 (de)
JP (1) JPH077643B2 (de)
AT (1) ATE28012T1 (de)
DE (1) DE3464438D1 (de)
FR (1) FR2544548B1 (de)
HK (1) HK27090A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0218961A1 (de) * 1985-09-27 1987-04-22 Hitachi, Ltd. Konvergenzkorrektureinrichtung zur Komakorrektur zur Verwendung in einer Kathodenstrahlröhre mit In-Line-Elektronenkanonen
GB2202082A (en) * 1986-12-27 1988-09-14 Sony Corp Cathode ray tubes
FR2818799A1 (fr) * 2000-12-22 2002-06-28 Thomson Tubes & Displays Systeme de deflexion pour tube a rayons cathodiques couleur corrige en coma horizontale

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1261966C (zh) 2002-10-02 2006-06-28 Lg飞利浦显示器(韩国)株式会社 彩色阴极射线管及电子枪

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4142131A (en) * 1975-11-12 1979-02-27 Hitachi, Ltd. Color picture tube
US4225804A (en) * 1978-04-22 1980-09-30 Gte Sylvania N.V. Cathode ray tube coma correction device
US4370593A (en) * 1980-12-30 1983-01-25 Rca Corporation In-line electron gun and method for modifying the same
DE3126344A1 (de) * 1981-07-03 1983-02-24 Anton Dr. 7900 Ulm Casel Ablenkeinheit fuer eine dreistrahlige farbfernseh-bildroehre

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5845135B2 (ja) * 1975-11-12 1983-10-07 株式会社日立製作所 ヘンコウジカイセイギヨソシツキカラ−ジユゾウカン
US4457733A (en) * 1980-09-29 1984-07-03 Zenith Radio Corporation Method for providing coextensive raster patterns in television CRT in-line electron guns
JPS5780640A (en) * 1980-11-07 1982-05-20 Toshiba Corp Color picture tube unit
JPS57126047A (en) * 1981-01-30 1982-08-05 Hitachi Ltd Color cathode-ray tube
JPS57187844A (en) * 1981-05-15 1982-11-18 Toshiba Corp Magnetic focusing crt

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4142131A (en) * 1975-11-12 1979-02-27 Hitachi, Ltd. Color picture tube
US4225804A (en) * 1978-04-22 1980-09-30 Gte Sylvania N.V. Cathode ray tube coma correction device
US4370593A (en) * 1980-12-30 1983-01-25 Rca Corporation In-line electron gun and method for modifying the same
DE3126344A1 (de) * 1981-07-03 1983-02-24 Anton Dr. 7900 Ulm Casel Ablenkeinheit fuer eine dreistrahlige farbfernseh-bildroehre

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, vol. 6, no. 160 (E-126) [1038], 21 août 1982; & JP-A-57 080 640 (TOKYO SHIBAURA DENKI K.K.) 20-05-1982 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0218961A1 (de) * 1985-09-27 1987-04-22 Hitachi, Ltd. Konvergenzkorrektureinrichtung zur Komakorrektur zur Verwendung in einer Kathodenstrahlröhre mit In-Line-Elektronenkanonen
GB2202082A (en) * 1986-12-27 1988-09-14 Sony Corp Cathode ray tubes
US4857796A (en) * 1986-12-27 1989-08-15 Sony Corporation Cathode-ray tube with electrostatic convergence means and magnetic misconvergence correcting mechanism
GB2202082B (en) * 1986-12-27 1990-09-19 Sony Corp Cathode ray tubes
FR2818799A1 (fr) * 2000-12-22 2002-06-28 Thomson Tubes & Displays Systeme de deflexion pour tube a rayons cathodiques couleur corrige en coma horizontale
WO2002052606A1 (en) * 2000-12-22 2002-07-04 Thomson Licensing S.A. Deflection system for colour cathode-ray tube with horizontal coma correction
KR100852918B1 (ko) * 2000-12-22 2008-08-19 톰슨 라이센싱 음극선관용 편향기 및 음극선관

Also Published As

Publication number Publication date
JPS59198641A (ja) 1984-11-10
FR2544548A1 (fr) 1984-10-19
FR2544548B1 (fr) 1985-12-27
HK27090A (en) 1990-04-12
JPH077643B2 (ja) 1995-01-30
US4725757A (en) 1988-02-16
EP0125949B1 (de) 1987-06-24
ATE28012T1 (de) 1987-07-15
DE3464438D1 (en) 1987-07-30

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