EP1557859A1 - Tube d'affichage en couleur muni d'un blindage magnétique amélioré - Google Patents

Tube d'affichage en couleur muni d'un blindage magnétique amélioré Download PDF

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Publication number
EP1557859A1
EP1557859A1 EP04001080A EP04001080A EP1557859A1 EP 1557859 A1 EP1557859 A1 EP 1557859A1 EP 04001080 A EP04001080 A EP 04001080A EP 04001080 A EP04001080 A EP 04001080A EP 1557859 A1 EP1557859 A1 EP 1557859A1
Authority
EP
European Patent Office
Prior art keywords
picture tube
color picture
tube according
slots
shielding
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.)
Withdrawn
Application number
EP04001080A
Other languages
German (de)
English (en)
Inventor
Konrad Dr. Leutz
Michael Neusch
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.)
PSI Esslingen GmbH
Original Assignee
MT Picture Display Germany GmbH
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 MT Picture Display Germany GmbH filed Critical MT Picture Display Germany GmbH
Priority to EP04001080A priority Critical patent/EP1557859A1/fr
Publication of EP1557859A1 publication Critical patent/EP1557859A1/fr
Withdrawn legal-status Critical Current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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06—Screens for shielding; Masks interposed in the electron stream
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/0007—Elimination of unwanted or stray electromagnetic effects
    • H01J2229/003—Preventing or cancelling fields entering the enclosure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/863—Passive shielding means associated with the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/863—Passive shielding means associated with the vessel
    • H01J2229/8634—Magnetic shielding

Definitions

  • the invention relates to a color picture tube with an improved shield against external magnetic fields, in particular the geomagnetic field. Especially The invention relates to a color television and a color monitor, which with a equipped with such a color picture tube.
  • FIG. 1 A cross section through a conventional color picture tube is shown in FIG.
  • the Color picture tube consists of a glass body 1, which in the production of a front section, the "screen tray", and a conically shaped rear section Section is composed.
  • On the inside of the front screen 2 of the Color picture tube is a phosphor layer applied with phosphor dots or strips.
  • An electron gun 3 in the neck of the color picture tube generates electron beams, which are accelerated towards the front screen 2 and on the Hit the phosphor layer. Electrical signals for controlling the electron gun 3, these are provided by contact pins at the end of the neck of the color picture tube of supplied externally.
  • a deflection unit 4 mounted externally on the color picture tube deflects the electron beams generated by the electron gun 3 so that successively all phosphor dots of the screen are controlled.
  • a shadow mask is held in a mask frame 5 is.
  • the shadow mask has a multitude of holes, each one a color tripple are assigned on the screen.
  • the shielding hood 6 which consists of a highly permeable Material is manufactured, reduces the influence of external magnetic fields on the course of the individual electron beams. This allows the color purity improve in image reproduction, so that the electron beams respectively exactly to the appropriate color point or color stripe meet. Without the shielding hood 6 would be the electron beams on their way towards the Deflected the screen and no longer hit the corresponding color point exactly.
  • the size of the geomagnetic field depends on the geographical location the color picture tube is located.
  • the influence of the lineup the color picture tube on the shield of the electron beams separately for the horizontal and vertical component is the influence of the earth magnetic Field on the deflection different for a horizontal field component and a vertical field component.
  • the Z-axis 7 is the picture tube, which corresponds to the undeflected electron beam, perpendicular to the vertical field component of the geomagnetic field.
  • a change of geographical location, on the other hand, operated the color picture tube also causes a change in the vertical component of the Earth's magnetic field. Although the subsequent site and therefore the exact size of the vertical Component of the earth's magnetic field is not known, it is generally by a landing advance in the manufacture of the color picture tube approximately compensated.
  • the vertical shield is also affected.
  • overcompensation means that the existing inside the color picture tube magnetic field in its direction is opposite to that of the external earth magnetic field.
  • the object of the invention is to provide a color picture tube with an improved magnetic Specify shielding, in particular such overcompensation in To avoid or reduce the shielding of the vertical earth magnetic field.
  • a color picture tube having a substantially indicated rectangular front screen, being inside the color picture tube arranged a shielding hood for shielding the earth's magnetic field is. At least on the shorter sides of the screening hood is at least one horizontal Slot provided.
  • the magnetization of the short sides of the shielding hood reduced, by introducing at least one horizontal slot.
  • the overcompensation in the presence of an outer vertical magnetic field can be reduced in the vertical direction, without the Shielding for the horizontal magnetic field component is affected.
  • a plurality of horizontal slots arranged on each of the short sides, i. the east / west sides of the screening hood. Leave it easily reduce the permeability without the shielding effect in a horizontal direction.
  • the plurality of Slots each in groups of closely spaced slits on each Page arranged.
  • the groups are preferably symmetrical to the center of the respective ones Page trained.
  • the inner group has a larger one Number of slots than the outer groups.
  • the inner group has three slots on each of the sides while the outer groups each comprise only one slot.
  • a conventional shielding hood 100 is shown in FIG.
  • the shielding hood 100 has a rim 150 for attachment to the mask frame within the color picture tube and shielding surfaces 110, 120.
  • the color picture tube correspond to the short sides 110 the east / west sides and the longer pages 120 the north / south sides.
  • the north / south sides 120 are for a suitable shielding of the horizontal component the earth magnetic field with a plurality of differently ausgestalteter Openings 130 provided.
  • the east / west surfaces 110 have no openings.
  • On the east / west sides 110 are each around the opening of the shielding hood 100 in FIG Direction of the electron gun a stiffening bead 140 is provided.
  • Furthermore are on the east / west sides 110 each several, preferably two spacer knobs 160 arranged. The spacer knobs 160 allow stacking the screening hoods 100, so that they are not bent during unstacking.
  • FIG. 3 An inventively improved shielding hood 200 is shown in Fig. 3.
  • the shielding hood 200 has a slot on the east / west faces 110 210 on. This slot 210 is in each case approximately in the middle of the short sides 110 arranged and horizontal, i. essentially parallel to the direction of the Z-axis the color picture tube, aligned.
  • the length of the slot 210 is chosen so that the vertical magnetization as small as possible.
  • the slot preferably extends over approximately the entire width of the pages 110-
  • FIGS. 4 to 6 In contrast to the perspective External view of the screening hood in FIGS. 2 and 3 is shown in FIGS. 4 to 6 another viewing direction selected, namely a view from the front into the screening hood into it. With built-in screening hood would look through the rear opening of the shielding hood in the direction of the electron gun of the color picture tube walk.
  • Figures 4 and 5 show the operation of a conventional shielding hood. to Clarification of the effect is in addition to the screening hood in both figures the size of the vertical geomagnetic field component B is shown, inside and outside the shielding hood via the arrows Bi, Ba with appropriate length.
  • the shielding hood has the purpose of the earth magnetic field inside the picture tube along the electron beams to attenuate or compensate.
  • the screening hood has the effect shown in Fig. 4.
  • the vertical component Ba of the external earth magnetic field (e.g., 40.4 ⁇ T in the Area of Esslingen) is partially compensated by the screening hood. Within the screening hood is the strength of the vertical component Bi of the earth magnetic Field Ba diminished. The orientation of the vertical component Bi has not changed in comparison to the outer component Ba.
  • Fig. 5 shows the same view, but in the case of overcompensation, in which the magnetization of the permeable parts of the color picture tube is too large.
  • the inner vertical magnetic field Bi is opposite in Fig. 5 the outer vertical Earth's magnetic field Ba. This overcompensation causes a correspondingly positive landing shift.
  • this overcompensation which is shown in Fig. 5, by at least one horizontal slot 210 in the east / west sides 110 of FIG Shielding hood compensated.
  • FIG. 6 shows a view corresponding to FIG. 5 a screening hood according to the invention.
  • the horizontal slot reduces the Magnetization of the east / west-side walls and causes a decrease in the internal vertical field Bi. Accordingly, the arrow length, which is the strength of the internal magnetic field Bi symbolizes, shortened. The decrease simultaneously a reduction of the positive landing shift and thus one improved color purity.
  • the screening hood 300 shown in FIG. 7 has three parallel to each other arranged horizontal slots 210, 310.
  • the slots are each symmetrical arranged to the center on the short sides 110.
  • Slot number and slot length can be the overcompensation of the shield be optimized in the vertical direction.
  • FIG. 7 A further advantageous embodiment for enhancing the reduction of the vertical Magnetization is shown in FIG.
  • the shielding hood 400 additional Slits 410 on.
  • the additional slots 410 are spaced from the inner Group of slots 210, 310 also symmetrical to the middle of the short ones Pages 110 arranged.
  • the invention relates to a color picture tube with an improved Shielding hood with which a greater color purity can be achieved.
  • Shielding hood with which a greater color purity can be achieved.
  • These are each provided with at least one horizontal slot. This allows the overcompensation of the magnetic shield in Compensate vertical direction in a simple manner efficiently.

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  • Electrodes For Cathode-Ray Tubes (AREA)
EP04001080A 2004-01-20 2004-01-20 Tube d'affichage en couleur muni d'un blindage magnétique amélioré Withdrawn EP1557859A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04001080A EP1557859A1 (fr) 2004-01-20 2004-01-20 Tube d'affichage en couleur muni d'un blindage magnétique amélioré

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04001080A EP1557859A1 (fr) 2004-01-20 2004-01-20 Tube d'affichage en couleur muni d'un blindage magnétique amélioré

Publications (1)

Publication Number Publication Date
EP1557859A1 true EP1557859A1 (fr) 2005-07-27

Family

ID=34626463

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04001080A Withdrawn EP1557859A1 (fr) 2004-01-20 2004-01-20 Tube d'affichage en couleur muni d'un blindage magnétique amélioré

Country Status (1)

Country Link
EP (1) EP1557859A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007027184A1 (fr) * 2005-08-31 2007-03-08 Thomson Licensing Écran magnétique interne de dispositif d’affichage à balayage orthogonal

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4580076A (en) * 1982-03-31 1986-04-01 Tokyo Shibaura Denki Kabushiki Kaisha Color cathode ray tube
JPH06243794A (ja) * 1993-02-15 1994-09-02 Sony Corp 陰極線管の内部磁気シールド
JP2002150964A (ja) * 2000-11-15 2002-05-24 Matsushita Electric Ind Co Ltd 内部磁気シールド及び陰極線管
JP2003187717A (ja) * 2001-12-17 2003-07-04 Matsushita Electric Ind Co Ltd 陰極線管の内部磁気シールド及び陰極線管を用いた表示装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4580076A (en) * 1982-03-31 1986-04-01 Tokyo Shibaura Denki Kabushiki Kaisha Color cathode ray tube
JPH06243794A (ja) * 1993-02-15 1994-09-02 Sony Corp 陰極線管の内部磁気シールド
JP2002150964A (ja) * 2000-11-15 2002-05-24 Matsushita Electric Ind Co Ltd 内部磁気シールド及び陰極線管
JP2003187717A (ja) * 2001-12-17 2003-07-04 Matsushita Electric Ind Co Ltd 陰極線管の内部磁気シールド及び陰極線管を用いた表示装置

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 626 (E - 1636) 29 November 1994 (1994-11-29) *
PATENT ABSTRACTS OF JAPAN vol. 2002, no. 09 4 September 2002 (2002-09-04) *
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 11 5 November 2003 (2003-11-05) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007027184A1 (fr) * 2005-08-31 2007-03-08 Thomson Licensing Écran magnétique interne de dispositif d’affichage à balayage orthogonal

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