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WO2000011701A1 - Electrode de selection de couleur pour tubes cathodiques de visualisation couleur - Google Patents

Electrode de selection de couleur pour tubes cathodiques de visualisation couleur Download PDF

Info

Publication number
WO2000011701A1
WO2000011701A1 PCT/EP1999/005772 EP9905772W WO0011701A1 WO 2000011701 A1 WO2000011701 A1 WO 2000011701A1 EP 9905772 W EP9905772 W EP 9905772W WO 0011701 A1 WO0011701 A1 WO 0011701A1
Authority
WO
WIPO (PCT)
Prior art keywords
mask
resilient support
thermal expansion
support members
expansion coefficient
Prior art date
Application number
PCT/EP1999/005772
Other languages
English (en)
Inventor
Daniel Den Engelsen
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Priority to JP2000566873A priority Critical patent/JP2002523868A/ja
Priority to EP99940179A priority patent/EP1048048A1/fr
Publication of WO2000011701A1 publication Critical patent/WO2000011701A1/fr

Links

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
    • H01J29/07—Shadow masks for colour television tubes
    • H01J29/073—Mounting arrangements associated with shadow masks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/07—Shadow masks
    • H01J2229/0722—Frame

Definitions

  • the frame is in general rectangular of shape.
  • the frame comprises a pair of support bars disposed in parallel to each other with a predetermined space there between.
  • Resilient support members which may be substantially U-shaped, are attached between the ends of the support bars.
  • Metal members may be connected to the frame to give the mask a certain stress relieve during further high temperature processing.
  • the mask is stretched under pressure and then connected to the frame, while the tension at the mask is maintained.
  • temperature differences occur between the mask and the supporting frame which can increase or decrease the tension of the mask.
  • the supporting frame will be warmer than the mask. This causes such a great difference in expansion between the supporting frame and the tensed mask that the tension in the mask in this stage may become larger than the elastic yield stress (i.e. the elastic limit) of the mask, as a result of which it may be deformed permanently.
  • the deformed mask is slack in the supporting frame. As a consequence mislanding occurs, i.e. each electron beam is not properly associated with luminescent areas of one color.
  • a further embodiment of a color display tube according to the invention is characterized in that the resilient support members have a thermal expansion coefficient of 11 x 10 "6 (°C) " ' and the metal members have a thermal expansion coefficient in the range of 6 x 10 "6 to 8 x 10 "6 (°C) " ⁇
  • a frame comprising mainly iron, which typically has a thermal expansion coefficient of 11 x 10 "6 (°C) " ⁇
  • Such a frame has the advantage of being stiff.
  • a good materials choice for the metal members may be an alloy of nickel and iron.
  • a suitable choice for the alloy composition for the metal members may be a nickel content of 43 to 50 %, leading to a thermal expansion coefficient in the range of 6 x 10 "6 to 8 x 10 ° (°C) ⁇ '.
  • a color display tube according to the invention is characterized in that the resilient support members have a thermal expansion coefficient in the range of 1.5 x 10 '6 to 6 x 10 "6 (°C) " ' and the metal members have a thermal expansion coefficient in the range of 1 x 10 "6 to 2 x 10 "6 (°C) *1 .
  • a good materials choice for both the frame and the mask is an alloy of nickel and iron, which has the advantage to result in a more elastic mask and consequently a lighter frame construction.
  • the designer of a cathode ray tube may use an alloy of nickel and iron for the metal members with a nickel content of about 36% (so- called technical Invar).
  • This grade nickel iron alloy has the advantage that it may contain some additional impurities and therefor will be cheaper.
  • Such a nickel content in the alloy will give rise to a thermal expansion coefficient of the metal members of about 1.1 x 10 "6 (°C) " '.
  • Fig. 3 is a side view of a color selection electrode according to the invention.
  • the designer of cathode ray tubes may use a frame 9 comprising an alloy of nickel and iron, having a nickel content in the range of 37% to 43%, which leads to a thermal expansion coefficient in the range of 1.5 x 10 "6 to 6 x 10 *6 (°C) " ⁇
  • the metal members 21 in this case may comprise an alloy of nickel and iron, having a nickel content in the order of 36%, resulting in a thermal expansion coefficient of about 1.1 x 10 "6 (°C) " '.
  • the invention relates to a color selection electrode 18 for use in a color cathode ray tube 1, in which the color selection electrode 18 comprises a frame 9 and a mask 20.
  • the frame 9 comprises a pair of mutually opposed support bars 19, metal members 21 and a pair of resilient support members 22 attached between the support bars 19.
  • the metal members 21 have a thermal expansion coefficient smaller than the resilient support members 22 and are connected to the resilient support members 22 on surfaces thereof facing the display screen 8. This construction prevents the mask 20 from being tensed beyond the elastic yield limited and from becoming permanently plastically deformed during further thermal processing of the cathode ray tube 1.

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

Cette invention a trait à une électrode de sélection de couleur (18) utilisable dans un tube cathodique couleur (1), laquelle électrode (18) comporte un bâti (9) et un masque (20). Le bâti (9) est constitué de barres de support opposées (19), d'éléments métalliques (21) et de deux pièces élastiques de support (22) assujetties entre les barres de support (19). Les éléments métalliques (21), qui ont un coefficient de dilatation thermique inférieur à celui des pièces élastiques de support (22), sont fixés sur les faces de ces pièces regardant l'écran de visualisation (8). Cet agencement évite au masque (20) du subir des forces de tension supérieures à ses limites élastiques et d'être déformé à demeure après un traitement thermique ultérieur du tube cathodique (1).
PCT/EP1999/005772 1998-08-20 1999-08-04 Electrode de selection de couleur pour tubes cathodiques de visualisation couleur WO2000011701A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2000566873A JP2002523868A (ja) 1998-08-20 1999-08-04 カラー表示管用カラー選択電極
EP99940179A EP1048048A1 (fr) 1998-08-20 1999-08-04 Electrode de selection de couleur pour tubes cathodiques de visualisation couleur

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP98202789 1998-08-20
EP98202789.8 1998-08-20

Publications (1)

Publication Number Publication Date
WO2000011701A1 true WO2000011701A1 (fr) 2000-03-02

Family

ID=8234050

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/005772 WO2000011701A1 (fr) 1998-08-20 1999-08-04 Electrode de selection de couleur pour tubes cathodiques de visualisation couleur

Country Status (4)

Country Link
EP (1) EP1048048A1 (fr)
JP (1) JP2002523868A (fr)
TW (1) TW412773B (fr)
WO (1) WO2000011701A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020026846A (ko) * 2000-10-03 2002-04-12 가네꼬 히사시 높은 색순도를 가진 컬러음극선관용 섀도우 마스크 어셈블리
WO2003017316A1 (fr) * 2001-08-13 2003-02-27 Thomson Licensing S.A. Tube cathodique comprenant une structure de support de masque a reduction de tension
WO2003005403A3 (fr) * 2001-07-06 2003-10-16 Thomson Licensing Sa Tube cathodique couleur comprenant un ensemble cadre de masque facilitant la detente du masque
KR100447653B1 (ko) * 2002-02-06 2004-09-07 엘지.필립스디스플레이(주) 칼라 음극선관용 마스크 어셈블리의 구조

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0393488A2 (fr) * 1989-04-18 1990-10-24 Sony Corporation Grille pour un tube à rayons cathodiques en couleurs
GB2303735A (en) * 1995-07-24 1997-02-26 Samsung Display Devices Co Ltd Shadow mask frame assembly
WO1998048438A1 (fr) * 1997-04-18 1998-10-29 Thomson Consumer Electronics, Inc. Ecran cathodique couleur et son mode de fonctionnement
EP0911857A2 (fr) * 1997-10-20 1999-04-28 Sony Corporation Masque d'ombre avec moyens d'amortissement de vibrations

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0393488A2 (fr) * 1989-04-18 1990-10-24 Sony Corporation Grille pour un tube à rayons cathodiques en couleurs
GB2303735A (en) * 1995-07-24 1997-02-26 Samsung Display Devices Co Ltd Shadow mask frame assembly
WO1998048438A1 (fr) * 1997-04-18 1998-10-29 Thomson Consumer Electronics, Inc. Ecran cathodique couleur et son mode de fonctionnement
EP0911857A2 (fr) * 1997-10-20 1999-04-28 Sony Corporation Masque d'ombre avec moyens d'amortissement de vibrations

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020026846A (ko) * 2000-10-03 2002-04-12 가네꼬 히사시 높은 색순도를 가진 컬러음극선관용 섀도우 마스크 어셈블리
WO2003005403A3 (fr) * 2001-07-06 2003-10-16 Thomson Licensing Sa Tube cathodique couleur comprenant un ensemble cadre de masque facilitant la detente du masque
US7215071B2 (en) 2001-07-06 2007-05-08 Thomson Licensing Color cathode ray tube having a detensioning mask frame assembly
WO2003017316A1 (fr) * 2001-08-13 2003-02-27 Thomson Licensing S.A. Tube cathodique comprenant une structure de support de masque a reduction de tension
KR100447653B1 (ko) * 2002-02-06 2004-09-07 엘지.필립스디스플레이(주) 칼라 음극선관용 마스크 어셈블리의 구조

Also Published As

Publication number Publication date
EP1048048A1 (fr) 2000-11-02
JP2002523868A (ja) 2002-07-30
TW412773B (en) 2000-11-21

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