EP0366523B1 - Schattenmaskenröhre für die Bilderzeugung, insbesondere fürs Farbfernsehen - Google Patents

Schattenmaskenröhre für die Bilderzeugung, insbesondere fürs Farbfernsehen Download PDF

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Publication number
EP0366523B1
EP0366523B1 EP89402864A EP89402864A EP0366523B1 EP 0366523 B1 EP0366523 B1 EP 0366523B1 EP 89402864 A EP89402864 A EP 89402864A EP 89402864 A EP89402864 A EP 89402864A EP 0366523 B1 EP0366523 B1 EP 0366523B1
Authority
EP
European Patent Office
Prior art keywords
heavy metal
silicate
mask
mainly
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.)
Expired - Lifetime
Application number
EP89402864A
Other languages
English (en)
French (fr)
Other versions
EP0366523A1 (de
Inventor
Franco Bucci
Gabriele Giancaterini
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.)
Thomson Tubes and Displays SA
Original Assignee
Thomson Tubes and Displays 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 Thomson Tubes and Displays SA filed Critical Thomson Tubes and Displays SA
Publication of EP0366523A1 publication Critical patent/EP0366523A1/de
Application granted granted Critical
Publication of EP0366523B1 publication Critical patent/EP0366523B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01J29/07—Shadow masks for colour television tubes
    • 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
    • H01J2229/0727—Aperture plate
    • H01J2229/0777—Coatings

Definitions

  • the invention relates to a mask tube for viewing on color television in which the face of the iron-based mask opposite the screen is covered with a heavy metal or a heavy metal compound of number atomic greater than 70.
  • a mask-type color television tube is formed by a glass bulb ending in a screen panel on which phosphors are deposited which, when struck by electrons, produce a generally red, green light radiation or blue. These phosphors are arranged on the screen in triads, a triad comprising a green phosphor, a red phosphor and a blue phosphor, each phosphor being excited by a corresponding electron beam.
  • a mask In front of the tube is placed a mask having holes of dimensions and arrangements such that in each triad the phosphor of a determined color is only excited by the electron beam assigned to this color.
  • the invention overcomes this drawback.
  • the heavy metal or the compound of heavy metal is mixed with an alkali silicate, the ratio between the weight of heavy metal, or compound of heavy metal, and the weight of silicate, being between 7 and 17, and preferably equal to 12.
  • the alkali silicate is for example chosen from at least one of the following silicates: potassium silicate, lithium silicate, sodium silicate.
  • an alkaline silicate for example potassium silicate
  • the amount of heavy metal deposited per unit area is greater than with the known technique.
  • the chosen proportion of silicate is sufficiently low so as not to substantially disturb the effect of reduction of heating produced by the heavy metal.
  • this ratio between the weight of heavy metal, or compound of heavy metal, and the weight of silicate ensures optimum adhesion to the metal mask and makes it possible to produce the coating with spraying or spraying equipment.
  • the alkali silicate is stable at high temperature, above 400 ° C, which allows it to withstand the heat treatment undergone by the mask during the manufacture of the tube.
  • the mixture of heavy metal, or of heavy metal compound, with the alkali silicate be formed of grains with dimensions of the order of 0.5 to 0.8 ⁇ m.
  • FIG. 1 is a view with an electron microscope of the surface of a mask of a color television tube covered with bismuth using a conventional technique
  • FIG. 2 is a similar view but with use of the invention, that is to say, in this example, a mask surface view covered with a mixture of potassium silicate and bismuth.

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)
  • Chemical Treatment Of Metals (AREA)

Claims (4)

  1. Maskenröhre zur Anzeige oder für das Farbfernsehen, in der die Fläche der Maske auf Eisenbasis, die dem Bildschirm abgewandt ist, mit einem Schwermetall oder einer Schwermetallverbindung mit einer Ordnungszahl größer als 70 beschichtet ist, dadurch gekennzeichnet, daß das Schwermetall oder die Schwermetallverbindung mit einem Alkalisilikat gemischt wird, wobei das Gewichtsverhältnis zwischen dem Schwermetall oder der Schwermetallverbindung und dem Silikat zwischen 7 und 17 liegt und vorzugsweise gleich 12 ist.
  2. Röhre gemäß Patentanspruch 1, dadurch gekennzeichnet, daß das Gemisch aus dem Schwermetall, oder der Schwermetallverbindung, und dem Alkalisilikat aus Körnern in der Größenordnung von 0,5 bis 0,8 µm besteht.
  3. Röhre gemäß Patentanspruch 1 oder 2, dadurch gekennzeichnet, daß es sich bei dem Schwermetall um Wismut handelt.
  4. Röhre gemäß irgendeinem der vorangehenden Patentansprüche, dadurch gekennzeichnet, daß das Alkalisilikat unter mindestens den folgenden Silikaten ausgewählt wird: Kaliumsilikat, Lithiumsilikat, Natriumsilikat.
EP89402864A 1988-10-25 1989-10-17 Schattenmaskenröhre für die Bilderzeugung, insbesondere fürs Farbfernsehen Expired - Lifetime EP0366523B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8813912A FR2638282B1 (fr) 1988-10-25 1988-10-25 Tube a masque pour la visualisation, notamment la television en couleurs
FR8813912 1988-10-25

Publications (2)

Publication Number Publication Date
EP0366523A1 EP0366523A1 (de) 1990-05-02
EP0366523B1 true EP0366523B1 (de) 1993-08-11

Family

ID=9371243

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89402864A Expired - Lifetime EP0366523B1 (de) 1988-10-25 1989-10-17 Schattenmaskenröhre für die Bilderzeugung, insbesondere fürs Farbfernsehen

Country Status (11)

Country Link
EP (1) EP0366523B1 (de)
JP (1) JPH02297841A (de)
KR (1) KR0130199B1 (de)
CA (1) CA2001321C (de)
DE (1) DE68908338T2 (de)
ES (1) ES2044179T3 (de)
FR (1) FR2638282B1 (de)
PL (1) PL161192B1 (de)
RU (1) RU2035791C1 (de)
TN (1) TNSN89115A1 (de)
TR (1) TR25751A (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4118734A1 (de) * 1991-06-07 1992-12-10 Nokia Deutschland Gmbh Schattenmaske fuer bildroehren
US5451833A (en) * 1993-10-28 1995-09-19 Chunghwa Picture Tubes, Ltd. Shadow mask damping for color CRT
TW305051B (de) * 1995-09-18 1997-05-11 Hitachi Ltd
DE19654613C2 (de) * 1996-12-20 2001-07-19 Samsung Display Devices Co Ltd Schattenmaske mit Dämmschicht und Verfahren zu ihrer Herstellung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3125075C2 (de) * 1980-07-16 1987-01-15 N.V. Philips' Gloeilampenfabrieken, Eindhoven Farbbildröhre
JPS6050845A (ja) * 1983-08-31 1985-03-20 Toshiba Corp カラ−受像管の製造方法
NL8400806A (nl) * 1984-03-14 1985-10-01 Philips Nv Kleurenbeeldbuis.
JPS62281225A (ja) * 1986-05-29 1987-12-07 Mitsubishi Electric Corp カラ−陰極線管の製造方法
JPS62281241A (ja) * 1986-05-29 1987-12-07 Mitsubishi Electric Corp 陰極線管
JPS62283526A (ja) * 1986-05-31 1987-12-09 Mitsubishi Electric Corp シヤドウマスク用電子反射被膜の形成方法

Also Published As

Publication number Publication date
KR900007033A (ko) 1990-05-09
CA2001321C (en) 2000-12-19
FR2638282B1 (fr) 1996-04-05
FR2638282A1 (fr) 1990-04-27
JPH02297841A (ja) 1990-12-10
EP0366523A1 (de) 1990-05-02
DE68908338D1 (de) 1993-09-16
PL161192B1 (pl) 1993-05-31
KR0130199B1 (ko) 1998-04-07
ES2044179T3 (es) 1994-01-01
RU2035791C1 (ru) 1995-05-20
CA2001321A1 (en) 1990-04-25
DE68908338T2 (de) 1993-12-16
TNSN89115A1 (fr) 1991-02-04
TR25751A (tr) 1993-07-26

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