US3573955A - Method of making a cathode-ray tube - Google Patents

Method of making a cathode-ray tube Download PDF

Info

Publication number
US3573955A
US3573955A US542967A US3573955DA US3573955A US 3573955 A US3573955 A US 3573955A US 542967 A US542967 A US 542967A US 3573955D A US3573955D A US 3573955DA US 3573955 A US3573955 A US 3573955A
Authority
US
United States
Prior art keywords
glass
layer
cathode
window
ray 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
US542967A
Other languages
English (en)
Inventor
Johannes De Gier
Reinhart Charles Willem Eisses
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.)
US Philips Corp
Original Assignee
US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3573955A publication Critical patent/US3573955A/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
    • 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
    • H01J29/863—Vessels or containers characterised by the material thereof
    • 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

Definitions

  • the invention relates to a cathode-ray tube.
  • it relates to a cathode-ray tube which is operated with comparatively high voltages, for example, for reproducing color television images.
  • cerium-containing glasses are used containing a maximum of 1% by weight of readily reducible compounds, such as oxides of lead, antimony and arsenic, and in addition a maximum of 15% by weight of sodium oxide.
  • Such a type of glass which contains, for example, of PbO and cerium to prevent discoloration caused by X-ray radiation, however, discolors appreciably when it is subjected to an intensive electron bombardment as the window of a cathode-ray tube for television reproduction as was to be expected on the basis of what was known already.
  • a cathode-ray tube particularly a tube suitable for the reproduction of color United States Patent 0 Ice television images, is provided with a glass envelope which consists of an X-ray absorbent glass containing lead oxide or other readily reducible metal oxides, and which at least in the window and its vicinity comprises on its inner side between the luminescent layer and the glass a substantially transparent layer which contains a maximum of 1% of reducible metal ions.
  • a layer of a substance which causes an even absorption of the luminescent light in such manner that the contrast is still acceptable in the case of bright ambient illumination may also be provided.
  • the layer containing a maximum of 1% of reducible metal ions only has to have a thickness of A to 10 microns. It is particularly surprising that such a thin layer is capable of completely absorbing the electrons passed by the layer of the luminescent substance or at least making them harmless in such manner that no appreciable discoloration occurs in the glass of the window by reduction of lead oxide or of other readily reducible metal oxides.
  • this layer may consist of vitreous SiO which can be provided in a simple manner, for example, by treating the inner side of the window, prior to applying the luminescent layer, with a solution of ethyl silicate which may be partly hydrolyzed, followed by hydrolysis, drying, and heating at a temperature of, for example, 350 C.
  • a similar layer can be obtained by treating the window with a solution of water glass and then heating the window.
  • the layer may be obtained by flocculation of a silicate solution. for example, by means of some multivalent positive ions. If required, the positive ions may be absorbed on the glass surface before the treatment with the silicate solution.
  • the layer is provided by means of a suspension, for example, of glass of the type which is known to show no discoloration under electron bombardment, as described above, or of a non-activated luminescent substance.
  • a cathode-ray tube is provided with a layer which receives the impinging electrons so that they cannot cause discoloration in the lead-containing glass of the envelope.
  • the latter layer is manufactured from a surface layer of the glass itself by leaching PbO, and, if required, other readily reducible metal oxides and/or Na O, at least for a predominant part.
  • the Na O is of importance in this connection because the Na+ ion, as a result of its great mobility, contributes to the reduction of the heavy metal oxide.
  • This leaching is carried out by exposing the glass for some time to a melt which contains potassium ions at a temperature between 350 and 450 C., as a result of which a substitution of potassium ions for sodium ions takes place.
  • a cathode-ray tube comprises a glass window 1 which is sealed to a cone 2 in the usual manner.
  • a thin transparent layer 3 is provided between the luminescent layer and the window which, as described hereinafter, serves to prevent discoloration of the window under electron bombardment.
  • a bulb was manufactured for a cathode-ray tube of the type designed for projection of television images
  • the glass of the window having the following composition in percent by weight:
  • the glass of the bulb was temperated by heating in the normal manner at 440 C. Thereafter, the bulb was washed with a warm 6% solution of soda and then rinsed with dimineralized water. Half of the window was coated with a readily removable lacquer consisting of polyvinylchloroacetate (the line of separation coincides with the diameter of the circular screen). A 7% solution of potassium silicate was then poured into the bulb and, after the Whole screen had been wetted by the solution, poured out again. The bulb was then heated at 120 C., so that the lacquer was dried and the silicate layer was dried in; the lacquer layer could then be removed easily together with the layer of potassium silicate deposited on it.
  • the potassium silicate adhered to the glass.
  • the neck of the bulb was rinsed with a 6% hydrofluoric acid solution.
  • the normal Al-layer was provided on the window by vapordeposition.
  • the luminescent layer was omitted because this was superfluous for illustrating the effect according to the invention.
  • the normal gettering material was atomized (barium-nickel), the bulb was provided with an electron gun, evacuated at 380 C, and sealed.
  • the tube thus obtained was provided with deflection coils and operated with a cathode voltage of 15 kv. for 35 hours, a surface of 78 cm. being scanned by the non-modulated electron beam.
  • the screen load was 200 #3.
  • a method for preventing high energy electrons from discoloring the window portion of a cathode-ray tube wherein said window portion consists of a glass capable of absorbing X-rays, capable of being discolored upon bombardment by high energy electrons and containing at least one easily reducible metal oxide comprising providing a thin hard transparent layer containing a maximum of 1% by weight of easily reducible metal oxides between said window portion and an activated phosphor layer.
  • the thin hard transparent layer is formed by applying to the inner surface of the window portion, prior to the application thereto of an activated phosphor layer, a solution of ethyl silicate, hydrolyzing said solution, evaporating the solvent from said solution and heating the resultant solid layer at a temperature at which SiO is formed and for a time suflicient to form a layer consisting substantially of vitreous SiO 3.
  • a solution of water glass is applied to the inner surface of the window portion prior to the application thereto of an activated phosphor layer, and the window portion is heated to a temperature sufficiently high to convert the water glass into a vitreous SiO layer.
  • the hard transparent layer is formed of a non-activated phosphor layer provided on the inner surface of the window portion prior to the application thereto of the activated phosphor layer.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Glass Compositions (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US542967A 1965-04-17 1966-04-15 Method of making a cathode-ray tube Expired - Lifetime US3573955A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL656504936A NL148437B (nl) 1965-04-17 1965-04-17 Werkwijze voor de vervaardiging van een kathodestraalbuis.

Publications (1)

Publication Number Publication Date
US3573955A true US3573955A (en) 1971-04-06

Family

ID=19792966

Family Applications (2)

Application Number Title Priority Date Filing Date
US542967A Expired - Lifetime US3573955A (en) 1965-04-17 1966-04-15 Method of making a cathode-ray tube
US00118761A Expired - Lifetime US3725710A (en) 1965-04-17 1971-02-25 Method of making a cathode-ray tube

Family Applications After (1)

Application Number Title Priority Date Filing Date
US00118761A Expired - Lifetime US3725710A (en) 1965-04-17 1971-02-25 Method of making a cathode-ray tube

Country Status (3)

Country Link
US (2) US3573955A (xx)
DE (1) DE1564398C3 (xx)
NL (1) NL148437B (xx)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3725710A (en) * 1965-04-17 1973-04-03 Philips Corp Method of making a cathode-ray tube
US5132585A (en) * 1990-12-21 1992-07-21 Motorola, Inc. Projection display faceplate employing an optically transmissive diamond coating of high thermal conductivity

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7906579A (nl) * 1979-09-03 1981-03-05 Philips Nv Glas, kathodestraalbuis voorzien van een scherm vervaardigd uit een dergelijk glas.
DE3151326A1 (de) * 1981-12-24 1983-07-07 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren zum herstellen einer elektronenroehre
EP0655767A1 (en) * 1993-11-29 1995-05-31 Corning Incorporated Preventing electron discoloration of glass
IL116092A (en) * 1994-11-30 2000-06-29 Honeywell Inc Ultraviolet transparent binder for phosphor fluorescent light box
US6069441A (en) * 1996-10-31 2000-05-30 Honeywell Inc. Method for producing phospher binding materials
JP2000515310A (ja) * 1997-05-26 2000-11-14 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 色フィルタ層を有するカラー表示装置
US6097144A (en) * 1998-10-28 2000-08-01 International Lead Zinc Research Organization, Inc. Cathode ray tubes having reduced glass browning properties
JP2003132816A (ja) * 2001-10-29 2003-05-09 Hitachi Ltd 陰極線管

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL148437B (nl) * 1965-04-17 1976-01-15 Philips Nv Werkwijze voor de vervaardiging van een kathodestraalbuis.
NL152702B (nl) * 1966-12-31 1977-03-15 Philips Nv Werkwijze voor het vervaardigen van een kathodestraalbuis, alsmede een kathodestraalbuis, vervaardigd door toepassing van deze werkwijze.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3725710A (en) * 1965-04-17 1973-04-03 Philips Corp Method of making a cathode-ray tube
US5132585A (en) * 1990-12-21 1992-07-21 Motorola, Inc. Projection display faceplate employing an optically transmissive diamond coating of high thermal conductivity

Also Published As

Publication number Publication date
DE1564398B2 (de) 1974-12-12
NL6504936A (xx) 1966-10-18
DE1564398C3 (de) 1975-07-24
US3725710A (en) 1973-04-03
NL148437B (nl) 1976-01-15
DE1564398A1 (de) 1969-10-23

Similar Documents

Publication Publication Date Title
US3141990A (en) Fluorescent lamp having a tio2 coating on the inner surface of the bulb
US3573955A (en) Method of making a cathode-ray tube
US3422298A (en) Cathode ray tube having a non-discoloring x-ray absorptive display window
US3654505A (en) Black enamel glass for cathode-ray tube
US3898509A (en) Cathode-ray tube having lithium silicate glare-reducing coating with reduced light transmission and method of fabrication
US3693018A (en) X-ray image intensifier tubes having the photo-cathode formed directly on the pick-up screen
DE1596927C3 (de) Glas für Elektronenstrahlröhren, insbesondere Farbfernsehbildröhren
US3758802A (en) Improved cathode ray tube having a glass envelope coated with crystallized glass
US2291406A (en) Cathode ray tube with X-ray absorbing coating
US3795531A (en) X-ray image intensifier tube and method of making same
US2418779A (en) Alkali metal halide and luminescent screens of substantially coincident spectral absorption
US3360674A (en) Europium and bismuth activated yttrium vanadate phosphor
US3011919A (en) Method of forming a multi-layer pick-up screen
US2689189A (en) X-ray fluorescent screen
US4568852A (en) Cathode ray tube with liquid coolant and reduced X-ray emission
US3904502A (en) Method of fabricating a color display screen employing a plurality of layers of phosphors
US4089693A (en) Glass for television display cathode-ray tubes
US6690107B1 (en) Color display device having color filter layers
US2743150A (en) Glass targets for image orthicons
US2689830A (en) Burn-resistant luminescent product and method of making the same
US2660686A (en) Fluorescent screen
US3543074A (en) Cathodluminescent glasses and cathode ray tubes employing same as the target
US3819409A (en) Method of manufacturing a display screen
JPH0218841A (ja) 陰極線管
US2879406A (en) Electron discharge tube structure