EP0164771A1 - Tube-image - Google Patents

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Publication number
EP0164771A1
EP0164771A1 EP85200640A EP85200640A EP0164771A1 EP 0164771 A1 EP0164771 A1 EP 0164771A1 EP 85200640 A EP85200640 A EP 85200640A EP 85200640 A EP85200640 A EP 85200640A EP 0164771 A1 EP0164771 A1 EP 0164771A1
Authority
EP
European Patent Office
Prior art keywords
deflection
field
electron beam
plates
display tube
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
EP85200640A
Other languages
German (de)
English (en)
Other versions
EP0164771B1 (fr
Inventor
Jan Gerritsen
Otto Mensies
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics 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 Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0164771A1 publication Critical patent/EP0164771A1/fr
Application granted granted Critical
Publication of EP0164771B1 publication Critical patent/EP0164771B1/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
    • H01J29/51—Arrangements for controlling convergence of a plurality of beams by means of electric field only
    • 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

  • the invention relates to an image display tube with an evacuated piston, which consists of an image window, a cone and a neck, in which an electron beam generator for generating an electron beam is accommodated, which is one on a screen attached to the inside of the image window Impact spot focused and deflected on this screen in two substantially perpendicular directions by deflection fields of a deflection coil system.
  • Such a picture display tube is used, for example, in an arrangement for representing symbols and / or figures, e.g. generated by a computer.
  • Such a picture display tube is known, for example, from the "Philips Data Handbook", Electron Tubes, Part 8, July 1983, Monitor Tubes.
  • deflection coils are used in which the generated horizontal deflection field, but also mostly the vertical deflection field, is designed in a pillow-like manner to minimize the raster distortion.
  • Such pillow-shaped deflection fields are known to influence the shape of the electron beam and thus, on the screen, the shape of the impact leak that this beam forms. It is now very desirable for data graphics tubes that the impact leak does not fluctuate too much across the entire screen, so that symbols and figures in the center, in the corners and on the edge of the screen are displayed almost equally sharply.
  • field shapers to reduce deflection defocusing (see, for example, US Pat. No. 4,346,327).
  • the invention has for its object to provide structurally simple and easy to arrange field formers for a picture display tube of the type mentioned.
  • edge fields of the deflection fields on the electron beam generator side of the deflection coil system are made barrel-shaped by means of field formers which contain four plates of ferromagnetic material which are grouped around the electron beam and extend essentially from the electron beam in the deflection directions, and are attached to the beam generator end at a substantially equal distance from this beam generator end.
  • the sometimes barrel-shaped distortion of the deflection fields means that the impact leakage distortion at the edge, but especially in the corners of the screen, is significantly reduced.
  • the field formers can easily be cut from ferromagnetic sheet metal and attached to the centering plate at the end of the beam generator. It was also found that such field formers can increase the sensitivity of the deflection.
  • the barrel-shaped distortion of the field becomes even clearer, but there is almost no increase in sensitivity to distraction.
  • the field formers for the horizontal deflection field preferably extend from the beam generator over a greater distance along the electron beam than the field formers for the vertical deflection field. This is particularly the case with so-called “hybrid” deflection coils (deflection coils both with saddle and with toroid coils).
  • the plates extending from the electron beam in the deflection directions are preferably provided with gaps extending in the deflection directions to prevent eddy currents in the field formers.
  • the additional plates made of ferromagnetic material can also be provided with slots. These slots are particularly important in field formers or in parts of field formers that extend essentially perpendicular to the horizontal field, because this deflection field fluctuates with the highest frequencies; (Horizontal frequency).
  • Fig. 1 is a partially broken, pers perspective view of an image display tube according to the invention.
  • This tube contains a glass bulb 1, which consists of an image window 2, a cone 3 and a neck 4, in which an electron beam generator 5 for generating an electron beam 6 is received.
  • This electron beam 6 is focused on a screen 7 to an impact spot 8.
  • the screen 7 is attached to the inside of the picture window 2.
  • the electron beam is deflected 'via the screen 7 in two directions x and y which are perpendicular to one another with the aid of the deflection coil system 9.
  • the deflection fields are designed in a pillow shape.
  • the deflection defocusing caused thereby can be reduced with field shapers according to FIG. 2.
  • These field formers are attached to the end 10 of the beam generator 5 which faces the deflection coil system 9.
  • the display tube is equipped with a base 11 with connection pins 12.
  • FIG. 2 is a perspective view of the beam generator 5 of the display tube of Figure 1.
  • This beam generator includes a control grating (G-1) 20, a second grating (G-2) 21 and a focusing lens made up of electrodes 22, 23 and 24 exists (G-3, G-4 or G-5).
  • the cathode which is not visible here, is located in the control grid.
  • the voltages to the electrodes are shown in the figure.
  • a centering plate 26 provided with an opening 25 is attached to the electrode 24. Centering springs are attached to this plate for centering the jet generator in the tube neck, but are omitted in this figure.
  • the edge field of the pillow-shaped deflection fields of the deflection coil system 9 see FIG.
  • the field formers 28 and 30 are provided in the field formers 28 and 30 running perpendicular to the horizontal field. It is of course possible also to provide the field formers 27 and 29 with such slots.
  • the field formers have, for example, a length of 10 mm in the direction of the electron gun axis 32; its width is, for example, 4.8 mm and the thickness is 0.25 mm.
  • the field formers can be cut from NiFe sheet (with 48% Ni) and attached to the centering plate 26 by means of spot welding.
  • dx and dy are the impact leak dimensions in mm in the center of the screen, on the top and bottom (N / S), on the left and right side (E / W) and in the corners of the screen.
  • the average magnification of the impact leak dimensions (in%), in particular in the corners of the screen, is significantly reduced.
  • the impingement leak dimensions apply to an electron beam current of approximately 100 / uA in a picture display tube with a picture diagonal of 31 cm and a 90 ° deflection of the electron beam.
  • FIG. 3 shows the barrel-shaped distortion of a pillow-shaped horizontal deflection field, of which some field lines 40 of the field formers 27, 28, 29 and 30 are shown.
  • FIG. 5 shows the magnetic field strength B, divided by the supplied field strength B ext , as a percentage depending on the distance from the axis 32 of the beam generator 5 in the direction of the field 40 according to FIG. 3.
  • FIG. 6 shows the barrel distortion of a pillow-shaped horizontal deflection field, of which some field lines 50 are shown, by T-shaped field formers 127, 128, 129, 130.
  • T-shaped field formers 127, 128, 129, 130 At the ends 51 of the plates facing away from the electron beam 6, which extend away from the electron beam, additional plates 52 and 53 made of ferromagnetic material are attached, which extend essentially perpendicular to the field to be formed.
  • the plates 52 extend almost perpendicular to the horizontal field shown and the plates 53 almost perpendicular to the vertical field, not shown.
  • FIGS. 7 and 8 are analogous to FIGS. 4 and 5.
  • the standardized field strength is approximately 100%.
  • the field is designed with the field formers according to FIG. 3 with a clear barrel shape. There is no increase in sensitivity to distraction.
  • FIG. 9 shows a cross section through a T-shaped field former 60, which consists of a piece of sheet metal is made.
  • the radius of curvature of the end 61 should be chosen to be as small as possible for the best possible barrel-shaped field.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Details Of Television Scanning (AREA)
EP85200640A 1984-05-07 1985-04-24 Tube-image Expired EP0164771B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8401444A NL8401444A (nl) 1984-05-07 1984-05-07 Beeldbuis.
NL8401444 1984-05-07

Publications (2)

Publication Number Publication Date
EP0164771A1 true EP0164771A1 (fr) 1985-12-18
EP0164771B1 EP0164771B1 (fr) 1989-07-12

Family

ID=19843907

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85200640A Expired EP0164771B1 (fr) 1984-05-07 1985-04-24 Tube-image

Country Status (9)

Country Link
US (1) US4691139A (fr)
EP (1) EP0164771B1 (fr)
JP (1) JPS60241630A (fr)
KR (1) KR920001871B1 (fr)
CA (1) CA1239975A (fr)
DD (1) DD233454A5 (fr)
DE (1) DE3571529D1 (fr)
ES (1) ES8700498A1 (fr)
NL (1) NL8401444A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2818799A1 (fr) * 2000-12-22 2002-06-28 Thomson Tubes & Displays Systeme de deflexion pour tube a rayons cathodiques couleur corrige en coma horizontale

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866080A (en) * 1973-08-08 1975-02-11 Rca Corp Inline electron gun having magnetically permeable plates for enhancing convergence of electron beams
US4057747A (en) * 1974-10-14 1977-11-08 Tokyo Shibaura Electric Company, Ltd. In-line plural beam color cathode ray tube having deflection defocus correcting elements
US4346327A (en) * 1978-02-27 1982-08-24 U.S. Philips Corporation Display tube for displaying color pictures
EP0112567A1 (fr) * 1982-12-24 1984-07-04 Matsushita Electronics Corporation Tube à rayon cathodique à rayon unique

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5522907B2 (fr) * 1973-05-04 1980-06-19
JPS52123831A (en) * 1976-04-12 1977-10-18 Toshiba Corp Cothode ray tube
JPS5583136A (en) * 1978-12-19 1980-06-23 Matsushita Electronics Corp Color image pick-up tube
JPS5738544A (en) * 1980-08-19 1982-03-03 Matsushita Electronics Corp Electromagnetic deflection system picture tube system equipment
JPS5761246A (en) * 1980-09-30 1982-04-13 Mitsubishi Electric Corp Electron gun for color picture tube
JPS5859536A (ja) * 1981-10-06 1983-04-08 Toshiba Corp カラ−受像管

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866080A (en) * 1973-08-08 1975-02-11 Rca Corp Inline electron gun having magnetically permeable plates for enhancing convergence of electron beams
US4057747A (en) * 1974-10-14 1977-11-08 Tokyo Shibaura Electric Company, Ltd. In-line plural beam color cathode ray tube having deflection defocus correcting elements
US4346327A (en) * 1978-02-27 1982-08-24 U.S. Philips Corporation Display tube for displaying color pictures
EP0112567A1 (fr) * 1982-12-24 1984-07-04 Matsushita Electronics Corporation Tube à rayon cathodique à rayon unique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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 (fr) * 2000-12-22 2002-07-04 Thomson Licensing S.A. Systeme de deflexion pour tube cathodique couleur avec correction horizontale du coma

Also Published As

Publication number Publication date
DE3571529D1 (en) 1989-08-17
CA1239975A (fr) 1988-08-02
JPS60241630A (ja) 1985-11-30
DD233454A5 (de) 1986-02-26
ES542824A0 (es) 1986-10-01
KR850008555A (ko) 1985-12-18
NL8401444A (nl) 1985-12-02
KR920001871B1 (ko) 1992-03-06
ES8700498A1 (es) 1986-10-01
US4691139A (en) 1987-09-01
EP0164771B1 (fr) 1989-07-12

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