WO2016182054A1 - Feuille de verre - Google Patents

Feuille de verre Download PDF

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Publication number
WO2016182054A1
WO2016182054A1 PCT/JP2016/064258 JP2016064258W WO2016182054A1 WO 2016182054 A1 WO2016182054 A1 WO 2016182054A1 JP 2016064258 W JP2016064258 W JP 2016064258W WO 2016182054 A1 WO2016182054 A1 WO 2016182054A1
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WO
WIPO (PCT)
Prior art keywords
glass plate
glass
less
main surface
tin
Prior art date
Application number
PCT/JP2016/064258
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English (en)
Japanese (ja)
Inventor
和田　直哉
雄介 荒井
博之 土屋
Original Assignee
旭硝子株式会社
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.)
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Publication date
Application filed by 旭硝子株式会社 filed Critical 旭硝子株式会社
Priority to CN201680026825.8A priority Critical patent/CN107531540A/zh
Publication of WO2016182054A1 publication Critical patent/WO2016182054A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B18/00—Shaping glass in contact with the surface of a liquid
    • C03B18/02—Forming sheets
    • 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
    • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
    • 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
    • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
    • C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
    • 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
    • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
    • C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
    • C03C3/087—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
    • 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
    • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
    • C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium

Definitions

  • the present invention relates to a glass plate.
  • an edge light type display device using a low power consumption light source such as an LED is known.
  • a light guide plate having two main surfaces facing each other and a light source arranged to face one end face of the light guide plate are used.
  • the “end face” of the light guide plate means four side surfaces that connect the two main surfaces of the light guide plate to each other. Of the four side surfaces, the end surface facing the light source is particularly referred to as an “incident end surface”.
  • the edge light system In the edge light system, light from the light source is incident on the incident end face of the light guide plate. Thereafter, the light incident on the light guide plate is emitted from one main surface (referred to as “exit main surface”). Therefore, the edge light system has a feature that the light incident direction and the light emitting direction in the light guide plate are perpendicular to each other.
  • an acrylic plate is used as a light guide plate of such an edge light type display device.
  • acrylic plates have problems from the viewpoints of scratch resistance, rigidity, heat resistance, and water resistance. Therefore, it is desired to use a glass plate that hardly causes such a problem as a light guide plate.
  • light guide plates used for digital signage, illumination, and the like.
  • a glass plate as a light guide plate for an edge light type display device or the like.
  • a glass plate produced by the float process has a thin colored layer on one main surface. This is because when a glass plate is formed from molten glass, impurities (for example, iron) in the molten tin react with components (for example, sulfur) in the molten glass on the surface that comes into contact with the molten tin, and coloring components This is because.
  • impurities for example, iron
  • components for example, sulfur
  • Color shift is a problem in various displays, digital signage, lighting, etc.
  • those with relatively large dimensions have become mainstream as seen in liquid crystal televisions and the like. Accordingly, since the propagation distance of light becomes longer as the display device and the light guide plate become larger, such a problem is expected to become more prominent in the future.
  • the present invention has been made in view of such a background, and an object of the present invention is to provide a glass plate in which the color shift between incident light and emitted light is significantly suppressed.
  • a glass plate having first and second main surfaces and formed on molten tin,
  • the first main surface is a side in contact with the molten tin, and has a tin-containing layer.
  • the first and second fractured sections which are taken from the central portion of the glass plate in a size of 50 mm length ⁇ 50 mm width and face each other are arithmetic.
  • sample A having an average roughness Ra ⁇ 0.03 ⁇ m, the average value of internal transmittance in the wavelength range of 400 nm to 700 nm at a length of 50 mm in the normal direction from the first fractured surface is 85%.
  • the difference between the maximum value and the minimum value in the wavelength range of 400 to 700 nm of the absorbance Ap of the tin-containing layer is 0.0007 or less, A glass plate is provided in which the maximum value of the absorbance Ap in the wavelength range of 400 nm to 700 nm is 0.0010 or less.
  • 4 is a graph showing an example of the measurement results of the reflectances Ra and Rb obtained on each main surface of the glass plate 1.
  • 3 is a graph showing an example of the measurement results of the reflectances Ra and Rb obtained on the main surfaces of the respective glass plates 2.
  • 4 is a graph showing an example of the measurement results of the reflectances Ra and Rb obtained on the main surfaces of the glass plates 3, respectively.
  • 3 is a graph showing the wavelength dependence of internal transmittances T 1i and T 2i in first and second polished samples collected from a glass plate 1.
  • 4 is a graph showing the wavelength dependence of the first reference reflectance R r and the second reference reflectance R t in the first and second polished samples collected from the glass plate 1.
  • 3 is a graph showing the wavelength dependence of internal transmittances T 1i and T 2i in first and second polished samples collected from a glass plate 2.
  • 6 is a graph showing the wavelength dependence of the first reference reflectance R r and the second reference reflectance R t in the first and second polished samples collected from the glass plate 2. It is the graph which showed the wavelength dependence of the light absorbency Ap of the tin content layer in the glass plate.
  • 4 is a graph showing the wavelength dependence of internal transmittances T 1i and T 2i in first and second polished samples collected from a glass plate 3.
  • FIG. 1 is a schematic exploded perspective view of a general edge light type display device.
  • the edge light type display device 10 usually includes a light source group 20, a light guide plate 30, and a display element 40.
  • the light source group 20 has one or more light sources 21 arranged in a line.
  • Each light source 21 may be a directional light source such as a light emitting diode (LED) or a laser diode.
  • the light guide plate 30 has first and second main surfaces 32A and 32B and four end faces 34A to 34D connecting the main surfaces.
  • the first main surface 32A of the light guide plate 30 has some scattering structure (not shown) such as a plurality of dots containing scattering particles, a plurality of dots not containing scattering particles, a plurality of convex lenses, and an uneven shape on the main surface. May be applied) and is also referred to as “scattering main surface”.
  • the second main surface 32B of the light guide plate 30 is on the emission side, and is also referred to as “emission main surface”.
  • the first main surface 32 ⁇ / b> A of the light guide plate 30 is the back side of the display device 10, and the second main surface 32 ⁇ / b> B is the front side of the display device 10.
  • the end face 34 ⁇ / b> A of the light guide plate 30 faces the light source group 20 and serves as an incident surface of the display device 10. Therefore, the end surface 34A of the light guide plate 30 is also referred to as an “incident end surface”.
  • the display element 40 is composed of, for example, a liquid crystal or a microcapsule containing black or white particles, and can form an image. Display element 40 is arranged to face second main surface 32 ⁇ / b> B of light guide plate 30.
  • the display device 10 having such a configuration operates as follows. First, light is irradiated from each light source 21 constituting the light source group 20 toward the incident end face 34 ⁇ / b> A of the light guide plate 30, and the light enters the light guide plate 30.
  • the incident light (incident light) propagates inside the light guide plate 30 while being reflected by each inner surface of the light guide plate 30, and the propagation direction is changed by some scattering structure formed on the first main surface 32A of the light guide plate 30.
  • the light is emitted from the second main surface 32B of the light guide plate 30.
  • the light emitted from the light guide plate 30 is then applied to the display element 40. As a result, the image formed by the display element 40 is displayed outside, and the viewer of the display device 10 can recognize the image formed by the display element 40.
  • FIG. 2 shows a schematic perspective view of a glass plate according to an embodiment of the present invention.
  • a glass plate (hereinafter referred to as “first glass plate”) 100 includes a first main surface 120 and a second main surface 122, and first to And fourth end faces 132 to 138.
  • the first main surface 120 is the side in contact with the molten tin when the first glass plate 100 is formed, and thus has a thin tin-containing layer (not shown).
  • a glass plate produced by the float process has a thin colored layer on one main surface.
  • a glass plate having such a colored layer is applied to the light guide plate 30 of the display device 10, there is a high possibility that a considerable amount of light is absorbed during propagation.
  • a specific wavelength portion during light propagation is selectively absorbed, light having a color different from the color of the incident light is emitted, which increases the possibility of so-called color shift.
  • the propagation distance of light becomes longer as the display device 10 and the light guide plate 30 become larger, such a problem may become more prominent in the future.
  • the first glass plate 100 is cut in a direction perpendicular to the first main surface 120, and is sampled in a size of 50 mm in length and 50 mm in width from the center portion of the first glass plate 100.
  • the first fractured surface has a length of 50 mm in the normal direction from the first fractured surface.
  • the average value T ave (hereinafter referred to as “average internal transmittance T ave ”) of the internal transmittance T in in the wavelength range of 400 nm to 700 nm is 85% or more.
  • the difference between the maximum value and the minimum value in the wavelength range of 400 nm to 700 nm of the absorbance Ap of the tin-containing layer is 0.0007 or less, and in the wavelength range of 400 nm to 700 nm of the absorbance Ap.
  • the maximum value is 0.0010 or less.
  • Such a first glass plate 100 has sufficiently high transparency over a relatively long optical path length perpendicular to the first split section.
  • the first glass plate 100 is sufficiently suppressed in coloring on the first main surface 120 having the tin-containing layer. For this reason, in the 1st glass plate 100, although it has a tin content layer in the 1st main surface 120, light absorption and the wavelength dependence of absorption can be controlled significantly.
  • the first glass plate 100 when used for the light guide plate 30 of the display device 10, for example, light can be propagated from the incident end face over the optical path length without much attenuation. .
  • the problem of color misregistration between incident light incident from the incident end face (for example, the first end face 132) and outgoing light emitted from the second main surface 122 is significantly suppressed. Is possible.
  • the reflectivity of the first main surface 120 is high due to the penetration of tin. Therefore, when the first glass plate 100 is used for the light guide plate 30 of the display device 10, the first main surface 120 is used as the back side of the display device 10 (that is, as the scattering main surface). More can be taken out from the opposing second main surface 122, which is preferable.
  • the reflectance of the second main surface 122 is lowered due to a decrease in alkali components due to the influence of the molding atmosphere. Therefore, when the first glass plate 100 is used for the light guide plate 30 of the display device 10, the second main surface 122 is used as the front surface side of the display device 10 (that is, as the emission main surface), thereby The reflection component can be reduced and more can be extracted from the second main surface 122, which is preferable.
  • a sample having a size of 50 mm in length and 50 mm in width is collected by cleaving from a substantially central portion of the target glass plate in a direction perpendicular to the first main surface of the glass plate.
  • the arithmetic average roughness Ra of the first and second fractured surfaces facing each other of this sample is 0.03 ⁇ m or less. If the arithmetic average roughness Ra is larger than 0.03 ⁇ m, the first and second fractured surfaces are polished with free abrasive grains of colloidal silica or cerium oxide.
  • 50 mm spectrometer capable of measuring in length e.g., UH4150: Hitachi High-Technologies Corporation
  • the slit or the like smaller than the thickness of the beam width of the incident light And measure.
  • n A [1+ ⁇ B 1 ⁇ 2 / ( ⁇ 2 ⁇ C 1 ) ⁇ + ⁇ B 2 ⁇ 2 / ( ⁇ 2 ⁇ C 2 ) ⁇ + ⁇ B 3 ⁇ 2 / ( ⁇ 2 ⁇ C 3 ) ⁇ ] 0.5 (1)
  • ⁇ is a wavelength.
  • the average internal transmittance T ave is 85% or more. In this case, when the first glass plate 100 is used as the light guide plate, more light can be extracted from the light guide plate.
  • the average internal transmittance T ave is preferably 90% or more, more preferably 92% or more, further preferably 95% or more, still more preferably 96% or more, 97% More preferably, it is 98% or more.
  • FIG. 3 is a diagram for explaining a method of preparing a first polished sample for measuring absorbance.
  • FIG. 4 is a diagram for explaining a method for preparing a second polished sample for measuring absorbance.
  • first and second samples are collected from a substantially central portion of the glass plate to be evaluated.
  • FIG. 3 schematically shows a cross section of the first sample 110-1.
  • FIG. 4 schematically shows a cross section of the second sample 110-2.
  • the first sample 110-1 has a first main surface 120A and a second main surface 122A.
  • the first main surface 120A and the second main surface 122A correspond to the first main surface and the second main surface of the original glass plate, respectively.
  • the first main surface 120 ⁇ / b> A is a tin contact surface when the glass plate is formed, and has a tin-containing layer 150.
  • the first main surface 120A side is polished by about 100 ⁇ m
  • the second main surface 122A side is polished by about 100 ⁇ m.
  • a first polishing surface 123A is newly formed on the first main surface 120A side
  • a second polishing surface 124A is newly formed on the second main surface 122A side.
  • Both the first polishing surface 123A and the second polishing surface 124A are in a mirror state with an arithmetic average roughness Ra of 0.04 ⁇ m or less.
  • the obtained sample 110-1 is referred to as a first polished sample 110A. Note that since the first main surface 120A is polished, the tin-containing layer 150 does not exist on the first polishing surface 123A.
  • the second sample 110-2 has a third main surface 120B and a fourth main surface 122B.
  • Third main surface 120B and fourth main surface 122B correspond to the first main surface and the second main surface of the original glass plate, respectively.
  • the third main surface 120 ⁇ / b> B is a tin contact surface when the glass plate is formed, and has a tin-containing layer 150.
  • the second sample 110-2 only the side of the fourth main surface 122B is polished by about 200 ⁇ m.
  • the sample 110-2 is polished so that the plate thickness of the sample 110-2 matches the plate thickness of the sample 110-1.
  • a fourth polishing surface 127B is newly formed on the fourth main surface 122B side.
  • the fourth polished surface 127B is in a mirror state with an arithmetic average roughness Ra of 0.04 ⁇ m or less.
  • the obtained sample 110-2 is referred to as a second polished sample 110B.
  • the first polishing surface 123A is roughened with abrasive grains having a particle size of # 80, and a black body paint is applied uniformly, and the wavelength in the range of 400 nm to 700 nm from the second polishing surface 124A side.
  • the reflectance (referred to as the first reference reflectance) R r of the second polished surface 124A is measured.
  • a spectroscopic measuring device capable of measuring the absolute reflectance is used. Note that the reflectance of the first polished surface 123A may be represented by R r .
  • the fourth polished surface 127B is roughened with abrasive grains having a particle size of # 80, and further a black body paint is applied uniformly, and then the third main surface 120B side has a wavelength in the range of 400 nm to 700 nm.
  • reflectance of the third main surface 120B (referred to as a second reference reflectance) measuring the R t.
  • a spectroscopic measuring device capable of measuring the absolute reflectance is used. Note that the reflectivity of the fourth polished surface 127B may be represented by R r .
  • the difference between the maximum value and the minimum value in the wavelength range of 400 nm to 700 nm of the absorbance Ap of the tin-containing layer is 0.0007 or less.
  • the difference between the maximum value and the minimum value of the absorbance Ap in the wavelength range of 400 nm to 700 nm is preferably 0.0006 or less, more preferably 0.0005 or less, and particularly preferably 0.0003 or less.
  • the maximum value of the absorbance Ap in the wavelength range of 400 nm to 700 nm is 0.0010 or less.
  • the maximum value of the absorbance Ap in the wavelength range of 400 nm to 700 nm is preferably 0.0008 or less, more preferably 0.0006 or less, and particularly preferably 0.0003 or less.
  • the average value of the reflectance R a (%) in the wavelength range of 400 nm to 700 nm on the first main surface 120 of the first glass plate 100 is expressed as R a. ave (hereinafter referred to as “first average reflectance R a.ave ”) (%), and the average value of the reflectance R b (%) in the wavelength range of 400 nm to 700 nm on the second main surface 122 is defined as R b .
  • ave hereinafter referred to as “second average reflectance R b.ave ” (%), the first average reflectance R a. ave (%) is the second average reflectance R b. ave (%) and the first average reflectance R a. ave (%) and the second average reflectance R b.
  • the difference ⁇ R of ave (%) is preferably larger than 0.25%.
  • the difference ⁇ R is larger than 0.25%
  • the first main surface 120 is the back side of the display device 10. (Ie, as a scattering main surface), and the light that collides with the first main surface 120 is reflected inside, and the amount of light emitted from the second main surface 122 side is increased. it can. Accordingly, the light extraction efficiency is increased.
  • the difference ⁇ R is more preferably greater than 0.27%, and particularly preferably greater than 0.30%.
  • the particle size of the second main surface 122 is set in order to prevent reflection from the second main surface 122 facing the surface to be measured. It is necessary to roughen with # 80 abrasive grains and to apply a black body paint uniformly. In this state, the reflectance R a (%) on the first main surface 120 is measured using a spectroscopic measurement apparatus capable of measuring absolute reflectance.
  • the particle size of the first main surface 120 is set to prevent reflection from the first main surface 120 facing the surface to be measured. It is necessary to roughen with # 80 abrasive grains and to apply a black body paint uniformly. In this state, the reflectance R b (%) on the second main surface 122 is measured using a spectroscopic measurement device capable of measuring absolute reflectance.
  • the dimension of the first glass plate 100 is not particularly limited as long as it has the above-described characteristics.
  • the glass plate 100 may have a large dimension in which at least one side has a length of 20 cm or more.
  • the thickness of the glass plate 100 does not affect the brightness of the light guide plate. However, when the thickness is less than 0.2 mm, the rigidity is not sufficient, and when the thickness is greater than 5 mm, the glass becomes heavy. Absent.
  • the shape of the glass plate 100 is not particularly limited, and the glass plate 100 may be, for example, a rectangular shape or a disk shape.
  • the rectangular glass plate 100 has four end surfaces, whereas the disk-shaped glass plate 100 has one end surface.
  • the first main surface 120 of the first glass plate 100 has a tin-containing layer 150.
  • the tin-containing layer 150 is formed by contacting molten tin when the first glass plate 100 is formed.
  • the thickness of the tin-containing layer 150 is determined by measuring the depth of the layer into which the tin component has penetrated by secondary ion mass spectrometry.
  • the thickness of the tin-containing layer 150 is usually 10 ⁇ m or less, and is often about 5 ⁇ m to 9 ⁇ m.
  • the maximum value of the concentration of iron oxide converted to Fe 2 O 3 is 0.2% by mass or less. It is preferable. In this case, since there is little iron which is a cause of coloring in the tin content layer 150, coloring can be restrained small. In the depth region of 10 ⁇ m from the surface of first main surface 120, the concentration of iron oxide converted to Fe 2 O 3 often becomes higher as the surface is closer. The concentration distribution of iron oxide converted to Fe 2 O 3 is measured by secondary ion mass spectrometry.
  • the maximum value of the tin oxide concentration converted to SnO 2 is preferably larger than 1.0 mass%.
  • the reflectance of the main surface 120 can be increased, and the first average reflectance R a. ave (%) is the second average reflectance R b. ave (%) and the first average reflectance R a. ave (%) and the second average reflectance R b. It is easy to make the difference ⁇ R of ave (%) larger than 0.25%. Therefore, when the first glass plate 100 is used as the light guide plate, the light extraction efficiency is increased.
  • the maximum value of the tin oxide concentration converted to SnO 2 is preferably 1.1% by mass or more, and is 1.2% by mass or more. It is more preferable that the content is 1.5% by mass or more.
  • composition of glass plate 100 The composition of the first glass plate 100 (excluding the portion of the tin-containing layer 150) is not particularly limited as long as it has the above-described characteristics, but the following three types (glass composition A, glass composition B, and glass composition C) A typical example of such a glass is (having glass).
  • SiO 2 is 60 to 80%
  • Al 2 O 3 is 0.5 to 7%
  • MgO is 0 to 10%
  • CaO is 0 to 0% by mass percentage on an oxide basis.
  • redox iron represented by the content of divalent iron ions in terms of Fe 2 O 3 to the content of total iron in terms of Fe 2 O 3 is preferably 40% or less.
  • the refractive index at room temperature of d-line (wavelength: 587.6 nm) of helium in the glass is 1.45 to 1.60. Specific examples include compositions 1 to 5 in Table 6.
  • the oxide-based mass percentage display is 45 to 80% SiO 2 , Al 2 O 3 is more than 7% and 30% or less, and B 2 O 3 is 0 to 15%.
  • MgO 0-15%, CaO 0-6%, SrO 0-5%, BaO 0-5%, Na 2 O 7-20%, K 2 O 0-10%, ZrO 2 It preferably contains 0 to 10% and 5 to 100 ppm by mass of Fe 2 O 3 .
  • redox iron represented by the content of divalent iron ions in terms of Fe 2 O 3 to the content of total iron in terms of Fe 2 O 3 is preferably 40% or less.
  • the refractive index at room temperature of d-line (wavelength: 587.6 nm) of helium in the glass is, for example, 1.45 to 1.60.
  • the glass composition is easy to ion exchange and easy to chemically strengthen. Specific examples include compositions 6 to 12 in Table 6.
  • SiO 2 is 45 to 70%
  • Al 2 O 3 is 10 to 30%
  • B 2 O 3 is 0 to 15%
  • CaO, SrO and BaO in a total of 5 to 30%
  • Li 2 O, Na 2 O and K 2 O in a total of 0% or more and less than 3%
  • Fe 2 O 3 in a content of 5 to 100 ppm by mass preferable.
  • redox iron represented by the content of divalent iron ions in terms of Fe 2 O 3 to the content of total iron in terms of Fe 2 O 3 is preferably 40% or less.
  • the refractive index at room temperature of d-line (wavelength: 587.6 nm) of helium in the glass is, for example, 1.45 to 1.60. Specific examples include compositions 13 to 15 in Table 6.
  • composition range of each component of the glass composition of the glass plate of the present invention having the above-described components will be described below.
  • SiO 2 is a main component of glass.
  • the content of SiO 2 is preferably 60% or more, more preferably 63% or more in the glass composition A in terms of the oxide-based mass percentage.
  • composition B it is preferably 45% or more, more preferably 50% or more
  • glass composition C it is preferably 45% or more, more preferably 50% or more.
  • the SiO 2 content facilitates dissolution and makes the foam quality good, and also keeps the iron content in the glass low and makes the optical properties good. Is preferably 80% or less, more preferably 75% or less.
  • the glass composition B preferably 80% or less, more preferably 70% or less, and in the glass composition C, preferably 70% or less. More preferably, it is 65% or less.
  • Al 2 O 3 is an essential component that can reduce the amount of intrusion of tin and suppress coloring in the tin-containing layer to a small level. In the glass of the present invention, it is preferable to reduce the coloration as much as possible.
  • the content of Al 2 O 3 is preferably 0.5% or more, more preferably 2% or more, and particularly preferably 3
  • the glass composition B it is preferably more than 7%, more preferably 8% or more, particularly preferably 10% or more, and in the glass composition C, preferably 10% or more, more preferably 11%. Above, especially preferably 13% or more.
  • the content of Al 2 O 3 is preferably 7% or less, more preferably 6% or less in the glass composition A, and preferably 30% or less, more preferably 23% or less in the glass composition B. In the glass composition C, it is preferably 30% or less, more preferably 20% or less.
  • B 2 O 3 is a component that promotes melting of the glass raw material and improves mechanical properties and weather resistance, but it does not cause inconveniences such as generation of striae due to volatilization and furnace wall erosion.
  • the content of B 2 O 3 is preferably 5% or less, more preferably 3% or less.
  • the content is preferably 15% or less, more preferably 12%. It is as follows.
  • Alkali metal oxides such as Li 2 O, Na 2 O, and K 2 O are useful components for accelerating melting of glass raw materials and adjusting thermal expansion, viscosity, and the like. Therefore, in the glass composition A, the content of Na 2 O is preferably 3% or more, more preferably 8% or more. In the glass composition B, the content of Na 2 O is preferably 7% or more, more preferably 10% or more. However, the content of Na 2 O is preferably 20% or less in the glass compositions A and B in order to maintain the clarity during melting and maintain the foam quality of the produced glass, and 15% More preferably, the glass composition C is 3% or less, more preferably 1% or less in the glass composition C.
  • the content of K 2 O is preferably 10% or less, more preferably 7% or less in the glass compositions A and B, and preferably 2% or less, more preferably 1% in the glass composition C. % Or less.
  • Li 2 O is an optional component, but in order to facilitate vitrification, to keep the iron content contained as an impurity derived from the raw material low, and to keep the batch cost low, in glass compositions A, B and C , Li 2 O can be contained at 2% or less.
  • the total content of these alkali metal oxides maintains the clarification at the time of melting, and in order to maintain the foam quality of the produced glass, in the glass compositions A and B In the glass composition C, it is preferably 0% to 2%, more preferably 0% to 1%.
  • Alkaline earth metal oxides such as MgO, CaO, SrO, and BaO are useful components for accelerating melting of glass raw materials and adjusting thermal expansion, viscosity, and the like.
  • MgO has the effect of lowering the viscosity during glass melting and promoting the melting. Moreover, since there exists an effect
  • CaO is a component that promotes melting of the glass raw material and adjusts viscosity, thermal expansion, and the like, and therefore can be contained in the glass compositions A, B, and C.
  • the content of CaO is preferably 3% or more, more preferably 5% or more.
  • the glass composition A is preferably 20% or less, more preferably 10% or less, and the glass composition B is preferably 6% or less, more preferably 4% or less.
  • SrO has the effect of increasing the thermal expansion coefficient and lowering the high temperature viscosity of the glass.
  • SrO can be contained in the glass compositions A, B and C.
  • the SrO content in the glass compositions A and C is preferably 15% or less, more preferably 10% or less, and in the glass composition B It is preferably 5% or less, and more preferably 3% or less.
  • BaO like SrO, has the effect of increasing the coefficient of thermal expansion and lowering the high temperature viscosity of the glass. In order to obtain the above effect, BaO can be contained. However, in order to keep the thermal expansion coefficient of the glass low, it is preferably 15% or less in the glass compositions A and C, more preferably 10% or less, and 5% or less in the glass composition B. Of these, 3% or less is more preferable.
  • the total content of these alkaline earth metal oxides is preferably 10 in the glass composition A in order to keep the coefficient of thermal expansion low, good devitrification properties, and maintain strength.
  • % To 30% more preferably 13% to 27%.
  • the glass composition B preferably 1% to 15%, more preferably 3% to 10%
  • the glass composition C preferably 5%.
  • % To 30% more preferably 10% to 20%.
  • ZrO 2 is an optional component
  • the glass compositions A, B and C are 10% or less, preferably 5%. You may make it contain below. However, if it exceeds 10%, the glass tends to be devitrified, which is not preferable.
  • the amount of Fe 2 O 3 refers to the total iron oxide amount in terms of Fe 2 O 3.
  • the total amount of iron oxide is preferably 5 to 50 ppm by mass, more preferably 5 to 30 ppm by mass. If the total iron oxide content is less than 5 ppm by mass, the infrared absorption of the glass becomes extremely poor, it is difficult to improve the meltability, and it takes a great deal of cost to purify the raw materials. Absent.
  • the total iron oxide content exceeds 100 ppm by mass, the tin-containing layer is unfavorably colored, and the average internal transmittance in the wavelength range of 400 nm to 700 nm is lowered.
  • Reducing the content of divalent iron ions is important for improving the average internal transmittance in the wavelength range of 400 nm to 700 nm and reducing the absorbance Ap of the tin-containing layer.
  • Redox iron represented by the content of divalent iron ions in terms of Fe 2 O 3 to the content of total iron in terms of Fe 2 O 3 is preferably 40% or less, 35% or less More preferably, it is more preferably 30% or less, still more preferably 20% or less, still more preferably 15% or less, and most preferably 10% or less.
  • the glass of the glass plate of the present invention may contain SO 3 as a refining agent but, SO 3 in the tin-containing layer, in combination with iron is likely to be colored source.
  • the SO 3 content is preferably 0.50% or less in terms of mass percentage. 0.40% or less is more preferable, 0.30% or less is more preferable, 0.25% or less is more preferable, and 0.20% or less is still more preferable.
  • the SO 3 content is an amount obtained by converting the amount of all sulfur ions such as S 4+ and S 2 ⁇ present in the glass into SO 3 .
  • the redox of sulfur represented by the ratio of the S 2 -content in the total sulfur ion content in the tin-containing layer is preferably low in order to reduce the absorbance Ap of the tin-containing layer.
  • the sulfur redox in the tin-containing layer should be 99% or less. Preferably, it is 98% or less, more preferably 97% or less, even more preferably 95% or less, and still more preferably 90% or less.
  • the glass of the glass plate of the present invention may contain one or more of Sb 2 O 3, SnO 2 and As 2 O 3 as an oxidizing agent and a clarifying agent.
  • the content of Sb 2 O 3 , SnO 2 or As 2 O 3 is preferably 0 to 0.5% in terms of mass percentage. 0.2% or less is more preferable, 0.1% or less is more preferable, and it is further more preferable not to contain substantially.
  • Sb 2 O 3 , SnO 2 and As 2 O 3 act as an oxidizing agent for glass, they may be added within the above range depending on the purpose of adjusting the amount of Fe 2+ in the glass. However, As 2 O 3 is not positively contained from the environmental viewpoint.
  • the glass of the glass plate of the present invention may contain NiO.
  • NiO functions also as a coloring component
  • the content of NiO is preferably 10 mass ppm or less with respect to the total amount of the glass composition described above.
  • NiO is preferably 1.0 ppm by mass or less, more preferably 0.5 ppm by mass or less, from the viewpoint of not reducing the internal transmittance of the glass plate at a wavelength of 400 to 700 nm.
  • the glass of the glass plate of the present invention may contain Cr 2 O 3 .
  • Cr 2 O 3 also functions as a coloring component, so the content of Cr 2 O 3 is 10 ppm by mass or less with respect to the total amount of the glass composition described above.
  • Cr 2 O 3 is preferably 1.0 mass ppm or less, and preferably 0.5 mass ppm or less from the viewpoint of not reducing the average internal transmittance in the wavelength range of 400 nm to 700 nm. More preferred.
  • the glass of the glass plate of the present invention may contain MnO 2 .
  • MnO 2 When MnO 2 is contained, MnO 2 also functions as a component that absorbs visible light. Therefore, the content of MnO 2 is preferably 50 ppm by mass or less with respect to the total amount of the glass composition described above.
  • MnO 2 is preferably 10 ppm by mass or less, more preferably 5 ppm by mass or less, from the viewpoint of not reducing the average value of internal transmittance in the wavelength range of 400 nm to 700 nm. More preferably, it is more preferably 1 ppm by mass or less.
  • the glass of the glass plate of the present invention may contain TiO 2 .
  • TiO 2 When TiO 2 is contained, TiO 2 also functions as a component that absorbs visible light. Therefore, the content of TiO 2 is preferably 1000 ppm by mass or less with respect to the total amount of the glass composition described above. The content of TiO 2 is more preferably 500 ppm by mass or less, and particularly preferably 100 ppm by mass or less, from the viewpoint of not reducing the average value of internal transmittance in the wavelength range of 400 nm to 700 nm.
  • Glass of the glass plate of the present invention may contain CeO 2.
  • CeO 2 has the effect of reducing the redox of iron, and can reduce the absorption of glass at a wavelength of 400 to 700 nm.
  • the CeO 2 content is preferably 1000 ppm by mass or less with respect to the total amount of the glass composition described above. Further, the CeO 2 content is more preferably 500 ppm by mass or less, further preferably 400 ppm by mass or less, particularly preferably 300 ppm by mass or less, and 250 ppm by mass or less. Most preferred.
  • the glass of the glass plate of the present invention may contain at least one component selected from the group consisting of CoO, V 2 O 5 and CuO. When these components are contained, they also function as a component that absorbs visible light. Therefore, the content of the components is preferably 10 mass ppm or less with respect to the total amount of the glass composition described above. In particular, it is preferable that these components are not substantially contained so as not to lower the average value of the internal transmittance in the wavelength range of 400 nm to 700 nm.
  • first manufacturing method (About the manufacturing method of the glass plate by one Embodiment of this invention) Next, an example of a glass plate manufacturing method (hereinafter referred to as “first manufacturing method”) according to an embodiment of the present invention having the above-described features will be briefly described.
  • FIG. 5 shows a schematic flow of the first manufacturing method.
  • the first manufacturing method is: (1) a step (step S110) of manufacturing a molten glass by melting a glass raw material; (2) transporting molten glass on a float bath to form a glass ribbon (step S120); (3) a step of cooling the glass ribbon (step S130).
  • a glass raw material is prepared by mixing predetermined raw material components. Moreover, this glass raw material is heated and a molten glass is manufactured.
  • the molten glass is prepared so as not to contain iron components (particularly Fe 2+ ) as impurities as much as possible. For this reason, a high-purity glass raw material is used. Further, the mixing process and the dissolving process are performed in an atmosphere with a high cleanliness.
  • the glass ribbon has a uniform thickness while moving on the molten tin.
  • ⁇ Coloring in the tin-containing layer of the glass can be effectively suppressed by combining any one or more of the following devices.
  • metallic impurities especially iron
  • metallic impurities can be a coloring factor on the molten tin surface of the glass
  • cooling the molten tin tin with a water tube will cause iron or an alloy of tin and iron or other materials around the water tube.
  • Metal impurities may be precipitated and metal impurities such as iron may be removed from the molten tin.
  • iron or an alloy of tin and iron or other metal impurities may be precipitated by inserting an electrode into molten tin and reducing the metal impurities such as iron from the molten tin.
  • an induction magnetic field may be generated locally, and tin containing a large amount of metal impurities such as iron may be collected around the area where the magnetic field is applied.
  • the metal impurities may be removed from the molten tin by causing the impurity glass to absorb the metal impurities in the molten tin.
  • some or all of the molten tin may be replaced with tin with a low content of metal impurities.
  • the flow rate, concentration and concentration distribution of gas such as hydrogen and nitrogen may be adjusted for the purpose of controlling the reduction degree of the bath atmosphere.
  • Increasing the hydrogen gas flow rate and concentration is preferable because it has the effect of reducing the absorbance Ap of the tin-containing layer.
  • the moving speed of the ribbon may be increased to 200 m / h or more so that the glass ribbon passes over the molten tin in a short time. Thereby, the penetration
  • iron in the molten tin it is preferable to reduce the amount of impurities such as iron in the molten tin as much as possible.
  • the iron content in tin specifically, it is preferably 200 mass ppm or less, preferably 150 mass ppm or less, more preferably 100 mass ppm or less, and 50 mass ppm or less. It is particularly preferable to do this.
  • Step S130 Thereafter, the glass ribbon is gradually cooled to a predetermined temperature. Moreover, a glass plate is obtained by cleaving the glass ribbon.
  • the glass plate by one Embodiment of this invention can be manufactured according to the above process.
  • the characteristics of the glass plate according to the embodiment of the present invention have been described by taking as an example the case where the glass plate according to the embodiment of the present invention is applied as a light guide plate of a display device.
  • the glass plate according to the present invention can be applied to various uses other than the light guide plate of the display device.
  • the glass plate according to the present invention is characterized by a low content of contaminants and a high transmittance, and thus can be applied to various surface emitting devices for illumination, cover glasses for solar cells, and the like.
  • the present invention can also be applied to building exterior materials, interior materials, furniture, and the like that require high design properties.
  • Examples 1 and 2 are examples
  • Example 3 is a comparative example.
  • glass plate 1 A glass plate having a thickness of 2.3 mm (referred to as “glass plate 1”) was produced by the method shown in FIG.
  • Example 2 A glass plate having a thickness of 2.5 mm was produced in the same manner as in Example 1. However, in Example 2, the glass plate was produced by changing the composition of the raw glass from that in Example 1. Other manufacturing conditions are the same as in Example 1. The obtained glass plate is referred to as a glass plate 2.
  • Example 3 A glass plate having a thickness of 2.0 mm was produced in the same manner as in Example 1. However, in Example 3, the glass composition was changed from that in Example 1 to produce a glass plate. Other manufacturing conditions are the same as in Example 1. The obtained glass plate is referred to as a glass plate 3.
  • the surface on the side in contact with the tin bath at the time of molding the glass is referred to as a first main surface, and the surface on the side opposite to the first main surface. Is referred to as the second main surface.
  • Table 2 below collectively shows the compositions of glass plates 1 to 3 and iron redox (Fe-Redox). In addition, these compositions are obtained by analyzing the glass plate after manufacture.
  • Figure 6 shows an example of the internal transmittance T in at 50mm length obtained in the glass plate 1 and glass plate 2.
  • FIG. 7 shows an example of the internal transmittance T in with a length of 50 mm obtained in the glass plate 3.
  • Table 3 below collectively shows the average internal transmittance T ave calculated for each glass plate 1 to 3 in a wavelength range of 400 nm to 700 nm at a length of 50 mm.
  • the average internal transmittance T ave at a length of 50 mm is 85% or more. It was found that good permeability was obtained. In addition, since the glass plate 3 has a high iron redox, the average internal transmittance T ave is less than 92%.
  • FIG. 8 an example of the measurement result of reflectivity Ra and Rb obtained in each main surface of the glass plate 1 is shown.
  • FIG. 9 an example of the measurement result of reflectivity Ra and Rb obtained in each main surface of the glass plate 2 is shown.
  • FIG. 10 shows an example of the measurement results of the reflectances R a and R b obtained on the main surfaces of the glass plates 3.
  • Table 4 shows the first average reflectivity Ra calculated for each of the glass plates 1 to 3 . ave , second average reflectance R b. ave and the difference ⁇ R between the two are collectively shown.
  • the first average reflectance R a. ave (%) is the second average reflectance R b. ave (%) and the first average reflectance R a. ave (%) and the second average reflectance R b.
  • the difference ⁇ R in ave (%) is larger than 0.25%, and it was confirmed that it is suitable for the use like the light guide plate 30 of the display device 10 shown in FIG.
  • first, two first and second samples were collected from a substantially central portion of each glass plate.
  • the side of the first main surface (corresponding to the first main surface of the glass plate) was polished by about 100 ⁇ m, and the side of the second main surface 122A was polished by about 100 ⁇ m. Thereby, the tin-containing layer on the first main surface was removed.
  • a first polishing surface was newly formed on the first main surface side, and a second polishing surface was newly formed on the second main surface side. Both the first polishing surface and the second polishing surface were polished until the arithmetic average roughness Ra reached a mirror surface state of 0.04 ⁇ m or less.
  • This first sample is referred to as a first polished sample.
  • the side of the fourth main surface (corresponding to the second main surface of the glass plate) was polished by about 200 ⁇ m, and the plate thickness was aligned with that of the first sample.
  • Each of the fourth main surfaces was polished until the arithmetic average roughness Ra reached a mirror surface state of 0.04 ⁇ m or less. As a result, a fourth polished surface was newly formed on the fourth main surface side.
  • This second sample is referred to as a second polished sample.
  • the thicknesses of the first sample and the second sample in the glass plate 1 were both 2.071 mm.
  • the thicknesses of the first sample and the second sample in the glass plate 2 were all 2.304 mm.
  • the thicknesses of the first sample and the second sample in the glass plate 3 were all 1.773 mm.
  • the first transmittance T 1 was measured in the wavelength range of 400 nm to 700 nm from the second polishing surface side.
  • the second transmittance T 2 was measured in the wavelength range of 400 nm to 700 nm from the fourth polishing surface side using the second polishing sample.
  • the first polishing surface is roughened with abrasive grains of particle size # 80, and further after applying a black body paint uniformly, from the second polishing surface side,
  • the reflectance (first reference reflectance R r ) of the second polished surface was measured in the wavelength range of 400 nm to 700 nm.
  • the fourth polishing surface is roughened with abrasive grains of particle size # 80, and further a black body paint is applied uniformly, and then from the third main surface side,
  • the reflectance of the third main surface (second reference reflectance R t ) was measured in the wavelength range of 400 nm to 700 nm.
  • a spectroscopic measurement device LAMBDA 950: manufactured by Perkin Elmer
  • an absolute reflectance measurement accessory was used.
  • a spectrophotometer U-4100: manufactured by Hitachi High-Technologies Corporation was used for measuring the transmittance.
  • the obtained transmittances T 1 and T 2 were converted into internal transmittances T 1i and T 2i by the above-described equations (4) and (5).
  • the absorbance Ap of the tin-containing layer was calculated from the above-described equations (6) to (8).
  • FIG. 11 shows the wavelength dependence of the internal transmittances T 1i and T 2i in the glass plate 1.
  • FIG. 12 shows the wavelength dependence of the first reference reflectance R r and the second reference reflectance R t in the glass plate 1.
  • FIG. 13 the wavelength dependence of the light absorbency Ap of the tin content layer in the glass plate 1 is shown.
  • FIG. 14 shows the wavelength dependence of the internal transmittances T 1i and T 2i in the glass plate 2.
  • FIG. 15 shows the wavelength dependency of the first reference reflectance R r and the second reference reflectance R t in the glass plate 2.
  • FIG. 16 the wavelength dependence of the light absorbency Ap of the tin content layer in the glass plate 2 is shown.
  • FIG. 17 shows the wavelength dependence of the internal transmittances T 1i and T 2i in the glass plate 3.
  • FIG. 18 shows the wavelength dependence of the first reference reflectance R r and the second reference reflectance R t in the glass plate 3.
  • FIG. 19 shows the wavelength dependence of the absorbance Ap of the tin-containing layer in the glass plate 3.
  • Table 5 shows the maximum value (Ap Max), the minimum value (Ap Min), and the maximum value-minimum value of the absorbance Ap of the tin-containing layer obtained in each glass plate in the wavelength range of 400 nm to 700 nm. (Ap Max -Ap Min) and the average value of absorbance Ap are collectively shown.
  • the difference between the maximum value and the minimum value in the wavelength range of 400 nm to 700 nm of the absorbance Ap of the tin-containing layer is 0.00048 and 0.00024, respectively. It was found to be small.
  • the difference between the maximum value and the minimum value of the absorbance Ap of the tin-containing layer was 0.00085, which was large.
  • the iron redox was as high as 50.0%. Therefore, the difference between the maximum value and the minimum value of the absorbance Ap was large.
  • the maximum values of absorbance Ap of the tin-containing layer in the wavelength range of 400 nm to 700 nm were 0.00055 and 0.00028, respectively.
  • the maximum absorbance Ap of the tin-containing layer in the wavelength range of 400 nm to 700 nm was 0.00120.
  • the iron redox was as high as 50.0%, and thus the maximum value of the absorbance Ap was increased.
  • the incident light of the specific wavelength is less absorbed by the tin-containing layer present on the first main surface. For this reason, in the glass plate 1 and the glass plate 2, the problem that a color shift arises between incident light and an emitted light can be suppressed significantly.
  • Table 6 shows the maximum iron oxide concentration (Fe 2 O 3 Max) converted to Fe 2 O 3 in the depth region of 10 ⁇ m from the first main surface of each glass plate, and 1 shows the maximum value (SnO 2 Max) of the concentration of tin oxide converted to SnO 2 in a depth region of 10 ⁇ m from the main surface of 1. These were measured by secondary ion mass spectrometry.
  • the maximum value of the iron oxide concentration in terms of Fe 2 O 3 up to a depth of 10 ⁇ m from the surface is 0.2 mass% or less, and 10 ⁇ m from the surface. It was found that the maximum value of the tin oxide concentration up to a depth of 1.0 was greater than 1.0 mass%.
  • the total iron content converted to Fe 2 O 3 is 100 mass ppm or less, the iron redox is 40% or less, and the SO 3 content is 0.50 mass% or less.
  • Al 2 O 3 content is 0.5% by mass or more, and the maximum concentration of iron oxide converted to Fe 2 O 3 from the surface to a depth of 10 ⁇ m is 0.2% by mass or less.
  • the glass plate 1 and glass plate 2 definitive from the surface to a depth of 10 [mu] m, the maximum value of the concentration of tin oxide in terms of SnO 2 is larger than 1.0 mass%, R a. ave (%) and R b. The difference in ave (%) is larger than 0.25%. Therefore, it was confirmed that the glass plate 1 and the glass plate 2 are suitable for a use like the light guide plate 30 of the display apparatus 10 shown in FIG.
  • Display apparatus 20 Light source group 21 Light source 30 Light guide plate 32A 1st main surface 32B 2nd main surface 34A-34D End surface 40 Display element 100 1st glass plate 110-1 1st sample 110-2 2nd sample 110A First polishing sample 110B Second polishing sample 120 First main surface 120A First main surface 120B Third main surface 122 Second main surface 122A Second main surface 122B Fourth main surface 123A First 1 polishing surface 124A 2nd polishing surface 127B 4th polishing surface 132 1st end surface 134 2nd end surface 136 3rd end surface 138 4th end surface 150 Tin content layer

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Abstract

L'invention concerne une feuille de verre qui présente une première et une deuxième surface principale et qui est formée sur de l'étain fondu, la première surface principale étant le côté qui a été en contact avec l'étain fondu et présentant une couche contenant de l'étain. Dans un échantillon A qui est obtenu à partir d'une partie centrale de la feuille de verre, présentant les dimensions d'une longueur de 50 mm et d'une largeur de 50 mm, par clivage de la feuille de verre dans une direction perpendiculaire à la première surface principale, de telle sorte que la première et la deuxième surface de clivage, opposées l'une à l'autre, présentent une rugosité moyenne arithmétique Ra ≤ 0,03 µm, une valeur moyenne de transmittance interne dans une plage de longueurs d'onde de 400 à 700 nm à une longueur de 50 mm à partir de la première surface de clivage dans une direction normale est de 85 % ou plus. La différence entre la valeur maximale et la valeur minimale d'une absorbance Ap de la couche contenant de l'étain dans la plage de longueurs d'onde de 400 à 700 nm est de 0,0007 ou moins et la valeur maximale de l'absorbance Ap dans la plage de longueurs d'onde de 400 à 700 nm est de 0,0010 ou moins.
PCT/JP2016/064258 2015-05-13 2016-05-13 Feuille de verre WO2016182054A1 (fr)

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WO2008056527A1 (fr) * 2006-11-10 2008-05-15 Asahi Glass Company, Limited Substrat de verre pour un dispositif d'affichage à panneau plat, procédé de fabrication de celui-ci et panneau d'affichage employant ledit substrat
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KR20140061348A (ko) * 2011-07-04 2014-05-21 에이쥐씨 글래스 유럽 에너지 투과율이 높은 플로트 유리 시트
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WO2008056527A1 (fr) * 2006-11-10 2008-05-15 Asahi Glass Company, Limited Substrat de verre pour un dispositif d'affichage à panneau plat, procédé de fabrication de celui-ci et panneau d'affichage employant ledit substrat
JP2012501285A (ja) * 2008-09-01 2012-01-19 サン−ゴバン グラス フランス ガラスを得るための方法及び得られたガラス
JP2011011951A (ja) * 2009-07-03 2011-01-20 Asahi Glass Co Ltd フラットパネルディスプレイ用ガラス基板およびその製造方法、ならびにそれを用いたディスプレイパネル

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