US3873343A - Method of forming secondary electron emission preventing layer for post-deflection acceleration type color picture tube - Google Patents

Method of forming secondary electron emission preventing layer for post-deflection acceleration type color picture tube Download PDF

Info

Publication number
US3873343A
US3873343A US286948A US28694872A US3873343A US 3873343 A US3873343 A US 3873343A US 286948 A US286948 A US 286948A US 28694872 A US28694872 A US 28694872A US 3873343 A US3873343 A US 3873343A
Authority
US
United States
Prior art keywords
layer
secondary electron
electron emission
emission preventing
picture 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
US286948A
Other languages
English (en)
Inventor
Akira Misumi
Toshiaki Kasai
Kenji Fukuda
Hiromitu Nakai
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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
Priority claimed from JP6889171A external-priority patent/JPS5246475B2/ja
Priority claimed from JP6889571A external-priority patent/JPS5332231B2/ja
Priority claimed from JP6889271A external-priority patent/JPS4834667A/ja
Priority claimed from JP6889371A external-priority patent/JPS5418106B2/ja
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Application granted granted Critical
Publication of US3873343A publication Critical patent/US3873343A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/14—Manufacture of electrodes or electrode systems of non-emitting electrodes
    • H01J9/142—Manufacture of electrodes or electrode systems of non-emitting electrodes of shadow-masks for colour television tubes
    • H01J9/146—Surface treatment, e.g. blackening, coating
    • 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
    • H01J29/80—Arrangements for controlling the ray or beam after passing the main deflection system, e.g. for post-acceleration or post-concentration, for colour switching
    • H01J29/81—Arrangements for controlling the ray or beam after passing the main deflection system, e.g. for post-acceleration or post-concentration, for colour switching using shadow masks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles

Definitions

  • ABSTRACT A method of forming a secondary electron emission preventing layer for a post-deflection acceleration type color picture tube, wherein a layer made of a mixture consisting of particles of a secondary electron emission preventing material, an organic binder and fine metal grains is formed on those surfaces of constituting parts inside the tube, at least a shadow mask, on which primary electrons impinge, or an inorganic binder layer made of an inorganic compound is formed on the surfaces and a mixed layer of particles of a secondary electron emission preventing material and an organic binder is formed on the inorganic binder layer, or the surfaces of the constituting parts are roughened and a mixed layer of particles of a secondary electron emission preventing material and an organic binder is formed on the roughened surfaces, the organic binder being thereafter burnt away by heat treatment.
  • a mixed layer of an inorganic binder consisting of an inorganic compound and particles ofa secondary electron emission preventing material is formed on the surfaces and a surface layer
  • the present invention relates to a post-deflection acceleration type color picture tube, and more particularly to a method of forming a secondary electron emission preventing layer thereof.
  • a prior-art secondary electron emission preventing layer for the post-deflection acceleration type color picture tube has been formed in such a way that a mixed layer which consists of a secondary electron emission preventing material such as graphite particles and an inorganic binder, such as water glass, not being burnt away by heat treatment in the manufacture of the tube and having the function of the binder even after completion of the tube is provided on, e.g., the surface of the shadow mask.
  • a mixed layer which consists of a secondary electron emission preventing material such as graphite particles and an inorganic binder, such as water glass, not being burnt away by heat treatment in the manufacture of the tube and having the function of the binder even after completion of the tube is provided on, e.g., the surface of the shadow mask.
  • the secondary electron emission preventing layer using as the binder, for example, only an organic binder which burns away by the heat treatment in the manufacture of the tube.
  • the secondary electron emission preventing layer has been formed in' such a manner that a suspension of the organic binder and particles of the secondary electron emission preventing material is sprayed by the conventional spraying method, and that the organic binder is burnt away by the heat treatment in the tube manufacturing process.
  • the secondary electron emission preventing layer thus obtained is not practical in being of a small adhesive force and being very liable to exfoliate.
  • An object of the present invention is to provide a method of forming a secondary electron emission preventing layer which is greatly effective to prevent the secondary emission.
  • Another object of the present invention is to provide a method of forming a secondary electron emission preventing layer according to which, not only the strength of the secondary electron emission preventing layer itself, but also the adhesive force of the secondary electron emission preventing layer with the surface of a member on which it is provided is increased.
  • FIG. 1 is a sectional view for explaining a prior-art method of forming a secondary electron emission preventing layer for a post-deflection acceleration type color picture tube;
  • FIG. 2 is a sectional view for explaining a method of forming a secondary electron emission preventing layer for a post-deflection acceleration type color picture tube and according to the present invention
  • FIG. 3 is a diagram showing secondary electron emission ratio for the secondary electron emission preventing layer formed by the method in FIG. 2, in comparison with that for the layer by the prior art method of FIG. 1;
  • FIGS. 4 and 5 are sectional views for explaining methods of forming a secondary electron emission preventing layer for a post-deflection acceleration type color picture tube and according to further embodiments of the present invention
  • FIG. 6 is a diagram similar to FIG. 3 showing secondary electron emission ratio for the secondary electron emission preventing layers formed by the methods in FIGS. 4 and 5;
  • FIG. 7 is a sectional view for explaining a method of forming a secondary electron emission preventing layer for a post-deflection acceleration type color picture tube and according to a still further embodiment of the present invention.
  • FIG. 8 is a diagram similar to FIG. 3 showing secondary electron emission ratio for the secondary electron emission preventing layer formed by the method in FIG. 7;
  • FIG. 9 is a sectional view for explaining a method of forming a secondary electron emission preventing layer for a post-deflection acceleration type color picture tube and according to a yet further embodiment of the present invention.
  • FIG. 10 is a diagram similar to FIG. 3 showing secondary electron emission ratio for the secondary electron emission preventing layer formed by the method in FIG. 9.
  • FIG. I illustrates a prior-art method of forming a secondary electron emission preventing layer for a postdeflection acceleration type color picture tube.
  • numeral 1 designates a component or member, such as a shadow mask, on which the secondary electron emission preventing layer is formed.
  • Shown at 2 is the secondary electron emission preventing layer which is composed of a mixed layer of a secondary electron emission preventing material 3 such as graphite particles and an inorganic binder 4. such as water glass, not being burnt off by heat treatment in the manufacture of the tube and keeping the function of the binder after completion of the tube.
  • the secondary electron emission preventing layer 2 is formed on the surface of the member I.
  • Such a secondary electron emission preventing layer 2 is advantageous in becoming a film with a strong adhesive force, since the inorganic binder 4 fully covers the surfaces of the particles 3 of the secondary electron emission preventing material and the surface of the secondary electron emission preventing layer 2 in the form of the thin film.
  • the secondary electron emission preventing effect exhibits a tendency as illustrated at a curve in FIG. 3, and the function as the secondary electron emission preventing layer is not sufficiently attained.
  • the secondary electron emission preventing layer has been formed in such a way that a suspension of the organic binder and the particles of the secondary electron emission preventing material is sprayed by the conventional spraying method, and that the organic binder is burnt off by the heat treatment in the tube producing process.
  • the secondary electron emission preventing layer formed in this way has been weak in the bonding power among the particles of the secondary electron emission preventing material, and has been very easily exfoliated.
  • the secondary electron emission preventing material has been made of fine particles being less than several microns in the particle size, there has been obtained the film of a secondary electron emission preventing layer which is increased in the bonding power among the particles and which has a sufficient bonding strength even after the baking.
  • a film thickness enough to prevent the secondary emission however, although the film is strong in the bonding power among the particles of the secondary electron emission preventing material, it is weak in the adhesive force between the particles of the secondary electron emission preventing material and the substrate or member on which the film is formed. A phenomenon in which the film exfoliates from the substrate has therefore occurred.
  • FIGS. 2 to 10 The present invention will be described hereunder with reference to FIGS. 2 to 10.
  • the same numerals are assigned to the same elements of the construction of the invention or necessary for explaining the invention.
  • FIG. 2 is a sectional view for explaining a method according to an embodiment of the present invention, for forming a secondary electron emission preventing layer for use in a post-deflection acceleration type color picture tube.
  • numeral I designates a member inside the tube, such as a shadow mask, on which the secondary electron emission preventing layer is formed.
  • Numeral 7 indicates a mixed layer of particles 3 ofa secondary electron emission preventing material, fine grains 5 of a metal, and an organic binder 6.
  • the mixed layer 7 is provided on that surface of the member inside the tube on which primary electrons impinge, for example, on the surface of the shadow mask on the electron gun side.
  • the secondary electron emission preventing layer is formed, by way of example, as below.
  • the fine metal grains 5, such as silver powder, being 1 ,u. or less in the grain diameter are added to a suspension of the organic binder 6 and the secondary electron emission preventing material 3 such as graphite to the amount of several percent by weight with respect to the secondary electron emission preventing material in the suspension.
  • the mixed layer 7 is made on, e.g., the surface of the shadow mask on the electron gun side by a suitable method such as spraying, coating with a brush, and immersion. Thereafter, the organic binder is burnt away by baking in the production of the tube.
  • a secondary electron emission preventing layer consisting of the secondary electron emission preventing material and the fine grains of the metal is formed.
  • a value of at least 3 t suffices for the thickness of the mixed layer 7.
  • a thickness of approximately 5 u to IO ,u is the most effective.
  • the upper limit is approximately 30 p. in practical use.
  • the fine metal grains 5 included within the secondary electron emission preventing layer are somewhat sintered during the baking. For this reason, the bonding force among the particles 3 of the secondary electron emission preventing material is increased, and the strength of the whole secondary electron emission preventing layer as well as the adhesive force of the same with the substrate I is increased.
  • the film of a strength sufficiently enduring practical use can accordingly be formed.
  • the added fine metal grains 5 amount to several percent or less with respect to the secondary electron emission preventing material 3, and are uniformly distributed in the film. For this reason, little increase in the secondary electron emission ratio is brought about, and the film can be satisfactorily put into practical use as the secondary electron emission preventing film.
  • the fine metal grains are desirably those which are difficult to oxidize in the air and which are small in the secondary emission ratio.
  • a smaller grain size is better. It has been made sure that, when the grain size exceeds 1 u, the adhesive force lowers.
  • the quantity of addition of the fine metal grains is determined in consideration of the secondary emission ratio of the fine metal grains, and generally amounts to several percent or less by weight.
  • the secondary emission ratio of the mixed layer of the graphite and silver powder as constitutes the secondary electron emission preventing layer thus formed is shown by a curve 21 in FIG. 3.
  • the secondary emission ratio of the mixed layer is increased only very slightly, and hence, the mixed layer is satisfactorily practicable as the secondary electron emission preventing layer.
  • the silver power can also be I p. or below in the grain size, and range from 0.01 to 0.5% by weight in the amount of addition.
  • the axis of abscissa represents the acceleration voltage (in volts) of primary electrons, while the axis of ordinate the secondary emission ratio (6). The same applies to FIGS. 6, 8 and 10.
  • the fine metal grains are directly used as the metal powder mixed into the particles 3 of the secondary electron emission preventing material.
  • the present invention is not restricted to such aspect, but fine metal grains may of course be employed which are obtained in such way that a metallic salt dissolved in a suitable solvent is added to the graphite suspension, and that the fine metal grains are precipitated from the metallic salt during the baking in the production of the tube.
  • FIG. 4 is a sectional view for explaining a method according to another embodiment of the present invention, for forming a secondary electron emission preventing layer for use in a post-deflection acceleration type color picture tube.
  • numeral 8 indicates an inorganic binder layer formed on the member 1 inside the tube and made of an inorganic compound, such as water glass, which does not burn away by the heat treatment.
  • Shown at 9 is a mixed layer which is formed on the inorganic binder layer 8 and in which the particles 3 of the secondary electron emission preventing material and the organic binder 6 are mixed.
  • the secondary electron emission preventing layer is formed, by way of example, as stated below.
  • an inorganic binder consisting of the inorganic compound, such as water glass, which does not burn off even by the heat treatment is very thinly coated on that surface of the member 1 on which primary electrons impinge, for example, the surface of a shadow mask on the electron gun side.
  • the inorganic binder layer 8 being I to 2 [L thick is formed.
  • a suspension of the organic binder 6 and the particles 3 of the secondary electron emission preventing material such as graphite and not exceeding several microns in the particle size is sprayed on the inorganic binder layer 8 by the conventional spraying method, to thereby form the mixed layer 9.
  • the organic binder 6 is burnt away by the heat treatment, to thereby form a secondary electron emission preventing layer which consists of the inorganic binder layer 8 and the secondary electron emission preventing material.
  • the secondary electron emission preventing layer is sufficiently strong in the bonding among the particles and in the bonding between the particles and the substrate or member, and can sufficiently endure practical use.
  • the inorganic binder having a large secondary emission ratio exists only in the vicinity of the surface of the member I, so that the secondary emission ratio of the secondary electron emission preventing layer can be suppressed to a sufficiently small value by thickly forming the mixed layer 9.
  • EXAMPLE 2 Potash water glass at a concentration of 10% by weight is sprayed onto the surface of a shadow mask, to form an inorganic binder layer made of the water glass, having a strong adhesive force, being in the semidried state and being I to 2 ,u. thick.
  • a suspension of graphite and an organic binder in water as contains 6.6% by weight of flake graphite of a particle size of l ,u. is sprayed onto the inorganic binder layer by means of a spray gun, to form a mixed layer of the graphite and organic binder and having a thickness of I0 s. Thereafter, the mixed layer is heated by the step of heat treatment in the process of producing the color picture tube, to burn off the organic binder. Then, a secondary electron emission preventing layer consisting of the inorganic binder layer and the graphite layer is formed.
  • the secondary electron emission preventing layer thus formed has a sufficient strength.
  • the secondary electron emission preventing effect of the layer of the embodiment is excellent as compared with that of the prior-art mixed layer which consists of the inorganic binder and the secondary electron emission preventing material and whose secondary emission preventing characteristics are shown at the curve 20.
  • the curve 23 is quite similar to a characteristic curve in the case of graphite alone with no inorganic binder layer, although the latter curve is not illustrated. Therefore, the layer of the invention exhibits an excellent effect of preventing the secondary electron emission.
  • FIG. 5 is a sectional view for explaining a method of forming a secondary electron emission preventing layer, according to a further embodiment of the present invention.
  • reference numeral 10 represents an inorganic binder layer which is formed on the member 1 and which is made of an inorganic binder, such as water glass, not burning off by heat treatment and fine powder 11 of a material, such as graphite and silver, not exerting any adverse effect on the picture tube.
  • Reference numeral 9 indicates the mixed layer which is formed on the inorganic binder layer 10 and which consists of the particles 3 of the secondary electron emission preventing material and the organic binder 6.
  • the addition of the fine powder 11 results in a roughened surface of the binder layer 10, and thus a stronger adhesion between the member 11 and the layer 10 and between the mixed layer 9 and the same can be obtained. Also, the roughened surface lowers secondary electron emission from the inorganic binder layer so that the secondary electron emission preventing effect is increased.
  • the secondary electron emission preventing layer is formed, by way of example, as below.
  • a mixture consisting of the inorganic binder solution which does not burn away even by the heat treatment and the fine powder of the material which exercises no evil influence on the picture tube is previously coated thinly on the member 1 by, e.g., the spraying method, to form the binder layer 10.
  • a suspension of the particles 3 of the secondary electron emission preventing material such as graphite and of a particle size of several microns or below, the suspension containing the organic binder 6, is sprayed by the conventional spraying method, to form the mixed layer 9.
  • the organic binder is burnt away by the heat treatment, to form a secondary electron emission preventing layer.
  • the secondary electron emission preventing layer is sufficient in the bonding among the particles and in the bonding between the particles and the substrate, and can satisfactorily endure practical use. Since the inorganic binder of a large secondary emission ratio is present only in the vicinity of the member 1, the secondary emission ratio of the secondary electron emission preventing layer can be restrained to a sufficiently small one if the layer is thickly formed.
  • EXAMPLE 3 A liquid consisting of potash water glass at a concentration of 10% by weight and 5% by weight of flake graphite of a particle size of 0.3 u in water is sprayed on the surface of the substrate of a shadow mask by means ofa spray gun. An inorganic binder layer having a strong adhesive force, being in the scmidried state and being l to 2 a thick is thus formed. A suspension of graphite and an organic binder in water as contains 6.6% by weight of flake graphite having a particle size of l p, is sprayed on the inorganic binder layer by means of a spray gun. A mixed layer consisting of the graphite and the organic binder and being 7 a thick is thus formed. Thereafter, the mixed layer is heated by the step of heat treatment in the process of manufacturing the color picture tube, to burn away the organic binder. A secondary electron emission preventing layer is thus formed.
  • the secondary electron emission preventing layer formed in this way has a sufficient strength.
  • the secondary emission ratio of the layer is shown by the curve 23 in FIG. 6 as in the secondary electron emission preventing layer according to the embodiment in FIG. 4.
  • a value of approximately 3 ,u. is sufficient in view of a satisfactory secondary electron emission preventing effect, and a value of approximately 5 to p. is effective in view of the working property, etc.
  • the upper limit of the thickness is approximately 30 u in practical use.
  • FIG. 7 is a sectional view for explaining a method according to a still further embodiment of the present invention, for forming a secondary electron emission preventing layer for a post-deflection acceleration type color picture tube.
  • the surface of the member 1 is roughened.
  • the mixed layer 9 of the secondary electron emission preventing material 3 and the organic binder 6 is formed on the uneven surface of the member 1.
  • the secondary electron emission preventing layer is formed, by way of example, as stated below.
  • the surface of the member 1, e.g., the surface of a shadow mask on the electron gun side is roughened by such method as chemical etching and sand blasting, to make unevenness of the surface ofthc member 1 large.
  • a suspension of the organic binder 6 and fine powder of the secondary electron emission preventing material 3 such as graphite of less than several microns in the particle size is sprayed onto the uneven surface, thereby to coat the suspension on the member 1.
  • the mixed layer 9 is formed.
  • the organic binder is burnt off by heat treatment, to form a secondary electron emission preventing layer on the member 1.
  • the secondary electron emission preventing layer is strong in its adhesive force with the member 1.
  • the layer does not exfoliate from the member 1, and can be put into practical use.
  • the surface of the member 1 is made uneven, the secondary emission preventing effect of the film of the secondary electron emission preventing layer formed on the surface of the member 1 can be enhanced more.
  • EXAMPLE 4 The surface of a shadow mask is roughened by sand blasting. A suspension of an organic binder and 6.6% by weight of flake graphite having a particle size of approximately 0.2 p. in water is sprayed on the roughened surface by a spray gun. Thus, a mixed layer consisting of the graphite and organic binder and having a thickness of 10 u is formed. Thereafter, the mixed layer is heated by the step of heat treatment in the process of manufacturing the color picture tube, to burn away the organic binder. A secondary electron emission preventing layer is thus formed. A curve 24 in FIG.
  • a curve 25 represents the secondary emission ratio of the prior-art secondary electron emission preventing layer which is formed similarly to the embodiment but without roughening the surface of the substrate
  • the curve 20 represents, as in FIGS. 3 and 6, the secondary emission ratio of the prior-art secondary electron emission preventing layer formed of the mixed layer of the inorganic binder and the secondary electron emission preventing material.
  • the secondary electron emission preventing layer formed in accordance with the embodiment in FIG. 7 has a sufficient mechanical strength, and as apparent from the graph, it has a sufficient secondary emission preventing effect as compared with the prior-art secondary electron emission preventing layers.
  • FIG. 9 is a view for explaining a method according to a still further embodiment of the present invention, for forming a secondary electron emission preventing layer for a post-deflection acceleration type color picture tube.
  • the mixed layer 2 which contains the inorganic binder 4 consisting of an inorganie compound, such as water glass, not burning away by heat treatment and the particles 3 of the secondary electron emission preventing material is formed on the member 1.
  • Numeral l2 designates a surface layer formed on the mixed layer 2 and made of the particles 3 of the secondary electron emission preventing material.
  • the addition of the particles of the secondary electron emission preventing material in the layer 2 is for decreasing secondary electron emission from this layer by roughing the surface of the layer 2 as well as by its particular property.
  • the roughened surface of the mixed layer also provides a stronger adhesion between the mixed layer and the surface layer.
  • the secondary electron emission preventing layer is formed, by way of example, as follows.
  • a mixture which consists of the inorganic binder 4 of water glass or the like, not burning away even by the heat treatment, and the particles 3 of the secondary electron emission preventing material such as graphite is very thinly coated on the surface of the member 1, for example, the surface of a shadow mask on the electron gun side.
  • the thickness of the coating is l 2 microns.
  • an organic binder burning away by the heat treatment may be mixed in order to raise the coating efficiency.
  • a liquid in which the particles 3 of the secondary electron emission preventing material of less than several microns in the particle size are dispersed in water or ethyl alcohol is sprayed on the coating by the conventional spraying method, for example, with a spray gun.
  • the surface layer 12 is formed.
  • a secondary electron emission preventing layer is composed of the surface layer 12 and the mixed layer 2.
  • the thickness of the surface layer 12 may suffice with several microns or more, and the upper limit is approximately 20 a.
  • the seeondary electron emission preventing layer is sufficiently strong in the bonding among the particles and the bonding between the particles and the substrate, and can satisfactorily endure practical use. Moreover, the secondary emission ratio of the layer can be suppressed to a sufficiently small value, since the inorganic binder of a large secondary emission ratio exists only in the vi einity of the member 1.
  • EXAMPLE 5 A mixed liquid containing potash water glass at a concentration of %by weight and 6.6% by weight of flake graphite of a particle size of l ,u. is sprayed on the surface of a shadow mask to a thickness of approximately 1 to 2 by means of a spray gun, to form a mixed layer 2. Subsequently, a liquid in which flake graphite particles are dispersed in water or ethyl alcohol at a concentration of l to 10% by weight, practicaily 6 to 8% by weight, is sprayed on the mixed layer using, for example, a spray gun, to form the surface layer. A secondary electron emission preventing layer is formed of the surface layer and the mixed layer.
  • the secondary electron emission preventing layer thus formed has a sufficient strength.
  • the secondary emission ratio is shown at a curve 26 in FIG. 10, which is quite similar to the case of graphite alone with no mixed layer 2, and hence, an excellent secondary emission preventing effect is exhibited.
  • the secondary electron emission preventing layer of the present invention has a great effect in improving a picture of the post-deflection acceleration type color picture tube by applying it not only to the shadow mask, but also to other components on which primary electrons impinge, for example, the inner wall of a glass bulb, a mask support, a shield electrode and so forth.
  • the method of forming a secondary electron emission preventing layer for a postdeflection acceleration type color picture tube according to the present invention is very greatly effective in practical use in that the bonding force of the particles of the secondary electron emission preventing material is increased, that the strength of the whole secondary electron emission preventing layer and the adhesive force of the layer with the substrate can be increased, and that the secondary emission ratio can be reduced as compared with that of the prior-art secondary electron emission preventing layer employing the inorganic binder.
  • a method of forming a secondary electron emission preventing layer for a post-deflection acceleration type color picture tube comprising: forming a first layer of water glass at least on a surface at which the formation of secondary electron emissions is to be prevented in a color picture tube on an electron gun side, forming a second layer of an organic binder containing graphite particles on said first layer, and thereafter burning away said organic binder in said second layer by a heat treatment, to form a secondary electron emission preventing layer on said surface.
  • said first layer is of a potash water glass material which does not burn away by heat treatment.
  • said surface at which the formation of secondary electron emission is prevented in a color picture tube on the electron gun side is a surface of at least one of a shadow mask, the inner wall of the glass bulb, a mask support, or a shield electrode.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
US286948A 1971-09-08 1972-09-07 Method of forming secondary electron emission preventing layer for post-deflection acceleration type color picture tube Expired - Lifetime US3873343A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP6889171A JPS5246475B2 (enrdf_load_stackoverflow) 1971-09-08 1971-09-08
JP6889571A JPS5332231B2 (enrdf_load_stackoverflow) 1971-09-08 1971-09-08
JP6889271A JPS4834667A (enrdf_load_stackoverflow) 1971-09-08 1971-09-08
JP6889371A JPS5418106B2 (enrdf_load_stackoverflow) 1971-09-08 1971-09-08

Publications (1)

Publication Number Publication Date
US3873343A true US3873343A (en) 1975-03-25

Family

ID=27465054

Family Applications (1)

Application Number Title Priority Date Filing Date
US286948A Expired - Lifetime US3873343A (en) 1971-09-08 1972-09-07 Method of forming secondary electron emission preventing layer for post-deflection acceleration type color picture tube

Country Status (5)

Country Link
US (1) US3873343A (enrdf_load_stackoverflow)
CA (1) CA974411A (enrdf_load_stackoverflow)
DE (1) DE2243976C3 (enrdf_load_stackoverflow)
FR (1) FR2152730B1 (enrdf_load_stackoverflow)
GB (1) GB1405899A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4427918A (en) 1981-01-26 1984-01-24 Rca Corporation Focusing color-selection structure for a CRT
US5455966A (en) * 1992-12-03 1995-10-03 U.S. Philips Corporation Method of manufacturing a display window for a cathode ray tube and a cathode ray tube
US5639330A (en) * 1990-03-14 1997-06-17 Matsushita Electric Industrial Co., Ltd. Method of making an image display element

Families Citing this family (1)

* 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

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2518434A (en) * 1945-07-12 1950-08-08 Emi Ltd Electron discharge device such as a television transmitting tube
US2829295A (en) * 1949-07-02 1958-04-01 Philips Corp Internally conductively coated lamp and method of manufacture
US2942130A (en) * 1957-02-25 1960-06-21 Corning Glass Works Aperture mask coating to prevent cathode poisoning
US3010092A (en) * 1958-08-05 1961-11-21 Bourns Inc Variable resistor
US3093501A (en) * 1957-04-04 1963-06-11 Peen Plate Inc Metal coating on non-metal body by tumbling
US3475639A (en) * 1967-01-19 1969-10-28 Television Cie Franc De Tricolor cathode ray tube having porous graphite layer on aluminum screen coating
US3600213A (en) * 1969-09-12 1971-08-17 Buckbee Mears Co Aperture masks
US3604970A (en) * 1968-10-14 1971-09-14 Varian Associates Nonelectron emissive electrode structure utilizing ion-plated nonemissive coatings
US3703401A (en) * 1970-12-28 1972-11-21 Rca Corp Method for preparing the viewing-screen structure of a cathode-ray tube

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2518434A (en) * 1945-07-12 1950-08-08 Emi Ltd Electron discharge device such as a television transmitting tube
US2829295A (en) * 1949-07-02 1958-04-01 Philips Corp Internally conductively coated lamp and method of manufacture
US2942130A (en) * 1957-02-25 1960-06-21 Corning Glass Works Aperture mask coating to prevent cathode poisoning
US3093501A (en) * 1957-04-04 1963-06-11 Peen Plate Inc Metal coating on non-metal body by tumbling
US3010092A (en) * 1958-08-05 1961-11-21 Bourns Inc Variable resistor
US3475639A (en) * 1967-01-19 1969-10-28 Television Cie Franc De Tricolor cathode ray tube having porous graphite layer on aluminum screen coating
US3604970A (en) * 1968-10-14 1971-09-14 Varian Associates Nonelectron emissive electrode structure utilizing ion-plated nonemissive coatings
US3600213A (en) * 1969-09-12 1971-08-17 Buckbee Mears Co Aperture masks
US3703401A (en) * 1970-12-28 1972-11-21 Rca Corp Method for preparing the viewing-screen structure of a cathode-ray tube

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4427918A (en) 1981-01-26 1984-01-24 Rca Corporation Focusing color-selection structure for a CRT
US5639330A (en) * 1990-03-14 1997-06-17 Matsushita Electric Industrial Co., Ltd. Method of making an image display element
US5455966A (en) * 1992-12-03 1995-10-03 U.S. Philips Corporation Method of manufacturing a display window for a cathode ray tube and a cathode ray tube

Also Published As

Publication number Publication date
DE2243976C3 (de) 1978-03-02
GB1405899A (en) 1975-09-10
DE2243976B2 (de) 1977-07-14
CA974411A (en) 1975-09-16
FR2152730B1 (enrdf_load_stackoverflow) 1976-01-23
FR2152730A1 (enrdf_load_stackoverflow) 1973-04-27
DE2243976A1 (de) 1973-03-22

Similar Documents

Publication Publication Date Title
US2708726A (en) Electron discharge device employing secondary electron emission and method of making same
CA1257639A (en) Cathode ray tube having a fluorescent layer with varying amounts of silica
US3697301A (en) Process of forming cathode ray tube screens to utilize the luminous efficiency of the phosphor material
US3873343A (en) Method of forming secondary electron emission preventing layer for post-deflection acceleration type color picture tube
JPS60240029A (ja) 陰極線管およびその製造方法
JP3479133B2 (ja) カラー陰極線管の蛍光面
JPH0210626A (ja) シヤドウマスクの電子反射膜の形成方法
US3714490A (en) Luminescent screen comprising phosphor cores luminescent in first color and phosphor coatings luminescent in second color
US3979632A (en) Cathode ray tube having surface charge inhibiting means therein
ES348526A1 (es) Un dispositivo de tubo de imagen de post-enroque para re- ceptores de television en color.
US5322707A (en) Method of forming a fluorescent screen
US2252552A (en) Luminescent coating
US4638213A (en) CRT with internal contact stripe or patch and method of making said stripe or patch
EP0025211B1 (en) Method of forming fluorescent screens of color picture tubes
US4163919A (en) Cathode ray tube internal resistive coating and method of manufacture
JPH0359542B2 (enrdf_load_stackoverflow)
US2690982A (en) Coated electrode
US5733163A (en) Shadow mask including electron reflection layer and method for manufacturing the same
US5326588A (en) Cathode ray tube
US3814966A (en) Post-deflection acceleration type color cathode-ray tube
KR940007246B1 (ko) 섀도우마스크의 제조방법
JPS60138822A (ja) 含浸形陰極
KR100490487B1 (ko) 음극선관용 내장 도료 조성물의 제조 방법 및 상기방법으로 제조된 음극선관용 내장 도료 조성물
JP3400499B2 (ja) 酸化物陰極及びその製造方法
JPH0546046B2 (enrdf_load_stackoverflow)