EP0400565A2 - Projektionskathodenstrahlröhre - Google Patents

Projektionskathodenstrahlröhre Download PDF

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Publication number
EP0400565A2
EP0400565A2 EP90110139A EP90110139A EP0400565A2 EP 0400565 A2 EP0400565 A2 EP 0400565A2 EP 90110139 A EP90110139 A EP 90110139A EP 90110139 A EP90110139 A EP 90110139A EP 0400565 A2 EP0400565 A2 EP 0400565A2
Authority
EP
European Patent Office
Prior art keywords
panel
ray tube
pnl
funnel
cathode
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Withdrawn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
EP90110139A
Other languages
English (en)
French (fr)
Other versions
EP0400565A3 (de
Inventor
Tetsuo Asano
Eiichi Yamazaki
Yasukazu Morita
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 JP13467389A external-priority patent/JPH031430A/ja
Priority claimed from JP21477989A external-priority patent/JPH0378945A/ja
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of EP0400565A2 publication Critical patent/EP0400565A2/de
Publication of EP0400565A3 publication Critical patent/EP0400565A3/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • 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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/88—Vessels; Containers; Vacuum locks provided with coatings on the walls thereof; Selection of materials for the coatings
    • 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
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/28—Luminescent screens with protective, conductive or reflective layers
    • 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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/89—Optical components associated with the vessel
    • H01J2229/8913—Anti-reflection, anti-glare, viewing angle and contrast improving treatments or devices
    • H01J2229/8916—Anti-reflection, anti-glare, viewing angle and contrast improving treatments or devices inside the vessel

Definitions

  • This invention relates to a projection cathode-ray tube which has a multilayer interference film, a phosphor layer, and a metal-backed layer formed in that order on the inner surface of a panel bonded to a funnel by frit glass welding, and more particularly, to a projection cathode-ray tube which allows a multilayer interference film to be formed uniformly even in a peripheral portion of a panel, causes no brightness decrease nor color shade in the panel peripheral portion, and has reliable high-voltage conduction between the panel and a funnel.
  • the type of projection cathode-ray tube was proposed in which a multilayer interference film is formed on the inner surface of a panel whose inner face is curved with a given curvature toward a neck of the cathode-ray tube to give directivity to a light beam emitted from a phosphor screen to thereby increase the quantity of light being taken in by a projection lens.
  • a multilayer interference film MIF, a phosphor layerPH, and a metal-backed layer MBK made of an aluminum deposition film are formed in that order on the inner surface of a panel PNL with a skirt portion SKT whose inner face is curved with a given curvature toward a neck; the skirt portion SKT of the panel PNL is secured to a funnel FNL using frit glass FRT; and high-voltage conduction is provided between the panel PNL and the funnel FNL by means of a contact spring CSP made of metal.
  • the foregoing and similar types of projection cathode-ray tubes are disclosed in Japanese Patent Laid-Open No. 61-273837, U.S. Patent Nos. 4,633,131 and 4,642,695, Japanese Utility Model Publication No. 63-24615, etc.
  • the panel PNL has the skirt portion SKT, evaporation from an evaporation source is shut off by the skirt portion SKT when forming, by vacuum deposition, the multilayer interference film MIF on individual panels PNL arranged in a row in mass production; consequently, the thickness of the interference film MIF deviates from a given level in a peripheral portion, particularly, in a corner portion, of the panel PNL to result in no desired characteristics of the interference film, with the result that brightness decrease or color shade occurs in the peripheral portion of the panel PNL.
  • the method of providing high-voltage conduction between the panel PNL and the funnel FNL by means of the contact spring CSP deforms mechanically and its strength of contact with a contact portion decreases due to a baking step or the like in manufacture, and the contact portion in contact with the contact spring CSP becomes critical in terms of mechanical strength.
  • the contact portion of the panel PNL on which the metal-backed layer MBK made of a black lead film or an aluminum deposition film is formed is mechanically destroyed upon contact with the contact spring CSP to damage conduction to thereby degrade reliability.
  • a projection cathode-ray tube whose structure is characterized in that a panel whose inner face is convex and has a given curvature is made in the form of a board with no skirt portion; a multilayer interference film, a phosphor layer, and a metal-backed layer are formed in that order on the inner surface of the panel; the margin of a peripheral portion of the panel is welded to a funnel using frit glass; and high-voltage conduction is provided between the panel and the funnel by mans of a conductive film made of a black lead film or an aluminum deposition film.
  • the panel inner surface can be readily polished because of no presence of a skirt portion, the accuracy of curvature of the panel inner surface can be readily improved.
  • the area of the panel inner face can be effectively utilized.
  • the panel is made in the form of a board with no skirt portion and its inner face is made flat with no curvature, the directivity of a light beam incident on a projection lens is lost, thereby causing brightness decrease or color shade in the panel peripheral portion.
  • This can be overcome by making the characteristic of the interference film different between a central portion and a peripheral portion (for example, by making the thickness of the interference film larger in the peripheral portion than in the central portion).
  • Fig. 2 schematically shows in cross section an embodiment of a projection cathode-ray tube according to the present invention.
  • a multilayer interference film MIF made of laminated titanium oxide (TiO2) and silicon oxide (SiO2), a phosphor layer PH made of a mixture of phosphor P53 and P1, and a metal-backed layer MBK made of an aluminum film are formed in that order on the inner surface of a panel PNL with no skirt portion whose inner face is convex and has a radius of curvature of about 350mm.
  • a peripheral portion of the panel PNL and an end face of a funnel FNL are secured together using frit glass FRT.
  • Conduction between the phosphor layer PH applied to the panel PNL and an internal conductive film ICC applied to the funnel FNL is provided by means of a conductive black lead film CC.
  • Figs. 3 and 4 show the normal brightness and chromaticity of the inner face of the phosphor screen panel of the thus composed projection cathode-ray tube (7-type) according to the present invention, measured varying the distance from the center of the phosphor screen panel, together with those of the conventional projection cathode-­ray tube.
  • the conventional sample tube exhibits the brightness and chromaticity decreasing steely in the peripheral portion
  • the present sample tube exhibits them decreasing gently up to the peripheral portion, thus is improved remarkably.
  • the present projection cathode-ray tube using the black lead film for conduction and the conventional projection cathode-ray tube using the contact spring for conduction were subjected to high-voltage conduction testing. Although the latter caused about 10% of imperfect high-voltage conduction, the former caused no imperfect high-voltage conduction. Further, they were subjected to withstand voltage testing. Although the latter became imperfect in terms of withstand voltage at 70KV, the former was well perfect in terms of withstand voltage even at 80 to 90KV.
  • the projection cathode-ray tube makes the panel (whose inner face is convex and has a given curvature) in the form of a board with no skirt portion; welds the peripheral margin of the panel to the end portion of the funnel using frit glass; and electrically connects the panels and the funnel using the conductive film. That is, there is provided the projection cathode-ray tube which has the multilayer interference film desirably uniform even in the panel peripheral portion, causes no brightness decrease nor color shade in the panel peripheral portion, and is very high in reliability in terms of high-voltage conduction.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
EP19900110139 1989-05-30 1990-05-29 Projektionskathodenstrahlröhre Withdrawn EP0400565A3 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP13467389A JPH031430A (ja) 1989-05-30 1989-05-30 投射形ブラウン管
JP134673/89 1989-05-30
JP214779/89 1989-08-23
JP21477989A JPH0378945A (ja) 1989-08-23 1989-08-23 陰極線管

Publications (2)

Publication Number Publication Date
EP0400565A2 true EP0400565A2 (de) 1990-12-05
EP0400565A3 EP0400565A3 (de) 1991-09-11

Family

ID=26468712

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900110139 Withdrawn EP0400565A3 (de) 1989-05-30 1990-05-29 Projektionskathodenstrahlröhre

Country Status (2)

Country Link
EP (1) EP0400565A3 (de)
KR (1) KR900019117A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001046983A1 (en) * 1999-12-22 2001-06-28 Koninklijke Philips Electronics N.V. Display tube

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU522177B2 (en) * 1978-02-06 1982-05-20 Esplin Kloss Henry Projection tv tube
GB2176048B (en) * 1985-05-29 1989-07-05 Philips Nv Projection television display tube and projection television device comprising at least one such tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001046983A1 (en) * 1999-12-22 2001-06-28 Koninklijke Philips Electronics N.V. Display tube

Also Published As

Publication number Publication date
KR900019117A (ko) 1990-12-24
EP0400565A3 (de) 1991-09-11

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