WO2003019607A1 - Verre de cône pour tube cathodique - Google Patents

Verre de cône pour tube cathodique Download PDF

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Publication number
WO2003019607A1
WO2003019607A1 PCT/JP2002/008467 JP0208467W WO03019607A1 WO 2003019607 A1 WO2003019607 A1 WO 2003019607A1 JP 0208467 W JP0208467 W JP 0208467W WO 03019607 A1 WO03019607 A1 WO 03019607A1
Authority
WO
WIPO (PCT)
Prior art keywords
glass
ray tube
cathode ray
funnel glass
funnel
Prior art date
Application number
PCT/JP2002/008467
Other languages
English (en)
Japanese (ja)
Inventor
Yoshiharu Miwa
Original Assignee
Nippon Electric Glass Co., 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
Application filed by Nippon Electric Glass Co., Ltd. filed Critical Nippon Electric Glass Co., Ltd.
Publication of WO2003019607A1 publication Critical patent/WO2003019607A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/102—Glass compositions containing silica with 40% to 90% silica, by weight containing lead
    • C03C3/105—Glass compositions containing silica with 40% to 90% silica, by weight containing lead containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C4/00—Compositions for glass with special properties
    • C03C4/08—Compositions for glass with special properties for glass selectively absorbing radiation of specified wave lengths
    • C03C4/087—Compositions for glass with special properties for glass selectively absorbing radiation of specified wave lengths for X-rays absorbing glass
    • 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

Definitions

  • the present invention relates to a funnel glass for a cathode ray tube.
  • the cathode ray tube envelope includes a panel glass on which an image is projected, a tubular neck glass on which an electron gun is mounted, and a funnel-shaped funnel glass connecting the panel glass and the neck glass.
  • Phosphor is coated on the inner surface of the panel glass to display images.
  • the inner and outer surfaces of each of the neck glass and the funnel glass are coated with a carbon conductive film (carbon doug) in order to equalize the potential inside the cathode ray tube bulb when generating an electron beam from the electron gun.
  • a cathode ray tube In a cathode ray tube, when an applied voltage is applied to the anode, an electron beam is emitted from the electron gun, which is a cathode, and the phosphor attached to the inner surface of the panel glass emits light to display an image on the panel glass. At this time, braking X-rays are generated in the cathode ray tube. Damping X-rays leaking out of the tube through the envelope can have an adverse effect on the human body. For this reason, this type of envelope is required to have high X-ray absorption capacity.
  • the light emitted from the phosphor mainly passes through the panel glass to display an image, but part of the light goes to the funnel side and enters the funnel glass.
  • the amount of light generated from the phosphor is particularly large, and therefore, the amount of light entering the funnel glass is also large.
  • the glass used as the conventional funnel glass is almost colorless and transparent, and the light transmittance at a wavelength of 450-650 nm is about 85% with a glass thickness of 10 mm. Therefore, light that has entered the funnel glass may repeatedly diffuse and reflect on the inner and outer surfaces of the glass and reach the panel glass.
  • the panel glass and the funnel glass are welded to the direct without any frit, so that light is easily guided from the funnel glass to the panel glass.
  • the light guided to the panel glass mixes with the image light, causing a problem of reducing the contrast of the image.
  • an object of the present invention is to provide a funnel glass for a cathode ray tube, which can prevent a decrease in the contrast of the cathode ray tube. Disclosure of the invention
  • the present inventor has found that by reducing the light transmittance in the visible region of the funnel glass for a cathode ray tube, the absorption of light penetrating the glass is increased, and the decrease in the contrast of the cathode ray tube is suppressed. I found that I could do it.
  • the light transmittance in a wavelength range of 450 to 65 nm is 80% or less at a glass thickness of 10 mm, and at a wavelength of 0.06 nm.
  • X-ray absorption coefficient of 40 cm- 1 or more is obtained.
  • the light transmittance in the wavelength range of 450 to 65 nm is set to 80% or less with a glass thickness of 10 mm.
  • the X-ray absorption coefficient at a wavelength of 0.06 nm is set to 40 cm- 1 or more.
  • this funnel glass Since this funnel glass has a light transmittance of 80% or less, it has an excellent light absorbing effect. For this reason, of the light emitted from the phosphor attached to the inner surface of the panel glass, the light that has entered the funnel glass is gradually absorbed into the glass while being repeatedly reflected on the inner and outer surfaces of the funnel glass. Therefore, it is necessary to reduce light that is guided from the panel glass to the panel glass and mixed into the image light. And a decrease in contrast can be prevented.
  • the transmittance of the glass is more than 80%, the effect of absorbing light is reduced, so that light mixed into the panel glass cannot be reduced, and the contrast is undesirably reduced.
  • the preferred light transmittance is 60% or less, more preferably 50% or less.
  • At least one colorant selected from the group consisting of CuO and MnO may be contained in a total amount of 10 to 50,000 ppm. If the total amount of the coloring agent is less than 10 ppm, the effect of lowering the transmittance of the glass is reduced. If the total amount is more than 50,000 ppm, the meltability of the glass is deteriorated.
  • the preferred range of the total amount of the colorant is 20 to 30,000 ppm.
  • the funnel glass for a cathode ray tube has a high X-ray absorption coefficient at 0.6 A of 40 cm- 1 or more, so that X-rays do not leak outside the tube.
  • compositions usable in this funnel glass in percent by mass, S I_ ⁇ 2 48 ⁇ 58%, A 1 2 0 3 0. 5 ⁇ 6%, PbO 10 ⁇ 30%, MgO 0 ⁇ 5%, CaO Less than six%, S R_ ⁇ 0 to 9%, B A_ ⁇ 0 to 9%, Na 2 ⁇ 3 ⁇ 9%, K 2 0 4 ⁇ ll %, Sb 2 0 3 0 ⁇ 1%, colorant 10 It is in the range of 50000 ppm, and it may be selected so as to satisfy the above conditions within this range.
  • the reasons for limiting the glass composition as described above are as follows.
  • S i ⁇ 2 is a component that becomes a glass network former.
  • the content of Si ⁇ 2 is 48 to 58% by mass, the molding of the funnel glass becomes easy, and the consistency with the thermal expansion coefficient of the neck glass is improved.
  • the preferred range of the funnel glass is 50-57% by mass.
  • a 1 2 ⁇ 3 is also a component that becomes the network former of glass. If the amount of A 1 2 0 3 is 0.5 to 6% by weight, molding of the funnel glass is facilitated, the tooth may, better consistency between the thermal expansion coefficient of the neck glass.
  • the preferred range of A 1 2 0 3 is from 1 to 5 mass%.
  • PbO is a component that increases the X-ray absorption coefficient of glass. When the content of PbO is 10 to 30% by mass, a sufficient X-ray absorption capacity can be obtained, and the viscosity can be adjusted to a value suitable for molding funnel glass.
  • the preferred range of Pb ⁇ is 15 to 27% by mass.
  • Mg ⁇ is a component that adjusts the coefficient of thermal expansion and viscosity while making glass easier to melt.
  • MgO is 5% by mass or less, the glass is not easily devitrified, and the liquidus temperature is lowered, so that funnel glass is easily molded.
  • Mg 0 is preferably at most 4% by mass.
  • Ca ⁇ is also a component that adjusts the coefficient of thermal expansion and the viscosity while making glass easier to melt, like MgO.
  • the content of Ca ⁇ is 6% by mass or less, the glass is hardly devitrified and the liquidus temperature is lowered, so that funnel glass is easily molded.
  • the preferred range of C a0 is 1 to 5% by mass.
  • each of SrO and BaO is 9 When the content is less than 10% by mass, the glass is less likely to be devitrified, and the liquidus temperature is lowered, so that funnel glass can be easily formed.
  • Each of 1 " ⁇ and 8 & ⁇ is preferably 7% by mass, respectively. It is as follows.
  • Na 2 ⁇ is a component that adjusts the coefficient of thermal expansion and viscosity.
  • the content of Na 2 3 is 3 to 9% by mass, the consistency with the thermal expansion coefficient of the neck glass is improved, and the viscosity can be adjusted to be suitable for molding the funnel glass.
  • a preferred range of N a 2 0 is 4-8 wt%.
  • K 2 ⁇ also a component that adjusts the thermal expansion coefficient and viscosity as well as the N a 2 0.
  • the content of K 20 is 4 to 11% by mass, the consistency with the thermal expansion coefficient of the neck glass is improved, and the viscosity can be adjusted to be suitable for molding the funnel glass.
  • the preferred range of ⁇ 2 ⁇ is 5 to 10% by mass.
  • Sb 2 ⁇ 3 is a component which acts as a fining agent.
  • Sb 2 ⁇ 3 is preferably 0.05 to 0.8 wt%.
  • the cathode-ray tube funnel glass in addition to the above components, as impurities resulting from the raw materials used, ZnO, that each of Z r0 2, T I_ ⁇ 2, F e 2 0 3 including multi Kutomo 2% it can.
  • the light transmittance is defined based on a glass thickness of 1 Omm, but it goes without saying that the present invention can be applied to any funnel glass having various thicknesses.
  • Table 1 shows examples of the present invention (sample Nos. 1 to 4) and comparative examples (sample No. 5).
  • Each sample in the table was prepared as follows First, glass raw materials were prepared so as to have the composition shown in the table, and were melted at 1500 ° C. for 4 hours using a platinum pot. In order to obtain a homogeneous glass, degassing was performed by stirring for 3 minutes on the way. Thereafter, the molten glass was poured into a mold, formed into a predetermined shape, and gradually cooled.
  • the X-ray absorption coefficient was obtained by calculating the absorption coefficient for a wavelength of 0.06 nm based on the glass composition and density.
  • the transmittance As for the transmittance, after optical polishing was performed so that the glass thickness became 10 mm, the light transmittance at a wavelength of 450 to 650 nm was measured with a spectrophotometer, and the maximum transmittance was shown in the table.
  • the average coefficient of thermal expansion at 30 to 380 ° C was measured with a dilatometer.
  • the temperature was measured at which the viscosity of the glass corresponds to 10 4 dP a ⁇ s by platinum ball pulling method.
  • This molding temperature is a guide when molding the molten glass into a predetermined shape, and the lower the temperature, the better the moldability.
  • each sample was first ground and mixed to a size of 300 to 500 m, mixed, placed in a platinum port, transferred to a temperature gradient furnace at 800 to 1200 ° C, and held for 48 hours. Then, a port made of platinum was taken out of the temperature gradient furnace. Then, the glass was taken out of the platinum port. The sample thus obtained was observed with a polarizing microscope, and the crystal precipitation point was measured.
  • each of the samples No. 1 to No. 4 has a high X-ray absorption coefficient of 66 cm- 1 or more, so that X-rays generated inside the cathode ray tube can be shielded.
  • the maximum transmittance of glass with a wavelength of 450 to 650 nm was as low as 55% or less.
  • the thermal expansion coefficient of 101 X 10- 7 Z ° C the panel can be well matched with glass Ya net Kugarasu, molding temperature 966 ° C below the liquidus temperature is lower than 890 ° C, glass Was also excellent in moldability.
  • the sample of sample No. 5 has the highest wavelength of 450-650 nm glass.
  • the large transmittance was as high as 84%.
  • the funnel glass prepared from each of Sample Nos.! To No. 4 is superior to the funnel glass prepared from Sample No. 5 in the effect of absorbing light. It can be assumed that it is possible to reduce the light mixed into the panel glass and prevent the contrast from decreasing. Industrial applicability
  • the funnel glass for a cathode ray tube of the present invention is suitable as a glass used for manufacturing a funnel for a cathode ray tube.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)

Abstract

L'invention concerne un verre de cône pour tube cathodique, qui permet de prévenir une atténuation du contraste du tube cathodique en absorbant la lumière dispersée dans le verre de cône. Le facteur de transmission lumineuse dans la plage de longueurs d'onde comprise entre 450 et 650 nm est égal ou inférieur à 80 % lorsque l'épaisseur du verre est de 10 mm, et le coefficient d'absorption de rayons X pour une longueur d'onde de 0,06 nm est égal ou supérieur à 40 cm-1.
PCT/JP2002/008467 2001-08-23 2002-08-22 Verre de cône pour tube cathodique WO2003019607A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001-253282 2001-08-23
JP2001253282A JP2003068233A (ja) 2001-08-23 2001-08-23 陰極線管用ファンネルガラス

Publications (1)

Publication Number Publication Date
WO2003019607A1 true WO2003019607A1 (fr) 2003-03-06

Family

ID=19081634

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2002/008467 WO2003019607A1 (fr) 2001-08-23 2002-08-22 Verre de cône pour tube cathodique

Country Status (3)

Country Link
JP (1) JP2003068233A (fr)
CN (1) CN1255848C (fr)
WO (1) WO2003019607A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107814483A (zh) * 2017-12-04 2018-03-20 滕州市耀海玻雕有限公司 一种节能耐火中空玻璃及其制造方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5844656A (ja) * 1981-09-09 1983-03-15 Hitachi Ltd 投写形ブラウン管
JPH07206469A (ja) * 1993-12-08 1995-08-08 Philips Electron Nv 表示管のコーンに用いるガラス、このガラスのコーンを有する表示管エンベロープおよびこのガラスからコーンを製造する方法
JP2000086279A (ja) * 1998-07-10 2000-03-28 Asahi Glass Co Ltd 陰極線管ファンネル用ガラス
JP2000323071A (ja) * 1999-05-13 2000-11-24 Nippon Electric Glass Co Ltd 陰極線管用ファンネルガラス
JP2001052632A (ja) * 1999-08-13 2001-02-23 Nippon Electric Glass Co Ltd 陰極線管用ネックガラス
JP2001148225A (ja) * 1999-09-07 2001-05-29 Nippon Electric Glass Co Ltd 陰極線管及び陰極線管の製造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5844656A (ja) * 1981-09-09 1983-03-15 Hitachi Ltd 投写形ブラウン管
JPH07206469A (ja) * 1993-12-08 1995-08-08 Philips Electron Nv 表示管のコーンに用いるガラス、このガラスのコーンを有する表示管エンベロープおよびこのガラスからコーンを製造する方法
JP2000086279A (ja) * 1998-07-10 2000-03-28 Asahi Glass Co Ltd 陰極線管ファンネル用ガラス
JP2000323071A (ja) * 1999-05-13 2000-11-24 Nippon Electric Glass Co Ltd 陰極線管用ファンネルガラス
JP2001052632A (ja) * 1999-08-13 2001-02-23 Nippon Electric Glass Co Ltd 陰極線管用ネックガラス
JP2001148225A (ja) * 1999-09-07 2001-05-29 Nippon Electric Glass Co Ltd 陰極線管及び陰極線管の製造方法

Also Published As

Publication number Publication date
CN1255848C (zh) 2006-05-10
JP2003068233A (ja) 2003-03-07
CN1545719A (zh) 2004-11-10

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