WO2020218056A1 - Cover glass and digital signage - Google Patents

Cover glass and digital signage Download PDF

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Publication number
WO2020218056A1
WO2020218056A1 PCT/JP2020/016268 JP2020016268W WO2020218056A1 WO 2020218056 A1 WO2020218056 A1 WO 2020218056A1 JP 2020016268 W JP2020016268 W JP 2020016268W WO 2020218056 A1 WO2020218056 A1 WO 2020218056A1
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WO
WIPO (PCT)
Prior art keywords
cover glass
glass plate
inorganic paint
glare
layer
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PCT/JP2020/016268
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French (fr)
Japanese (ja)
Inventor
耕司 池上
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日本電気硝子株式会社
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Application filed by 日本電気硝子株式会社 filed Critical 日本電気硝子株式会社
Priority to JP2021516000A priority Critical patent/JPWO2020218056A1/ja
Publication of WO2020218056A1 publication Critical patent/WO2020218056A1/en

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    • 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
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
    • C03C17/42—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating of an organic material and at least one non-metal coating
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11—Anti-reflection coatings
    • G02B1/113—Anti-reflection coatings using inorganic layer materials only
    • G02B1/115—Multilayers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/18—Coatings for keeping optical surfaces clean, e.g. hydrophobic or photo-catalytic films
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements

Definitions

  • the present invention relates to a cover glass and digital signage using the same.
  • Patent Document 1 discloses a translucent structure having a concavo-convex structure for enhancing antiglare and the like.
  • An object of the present invention is to provide a cover glass and digital signage that can effectively enhance visibility.
  • the cover glass of the present invention includes a glass plate, an anti-glare layer provided on the glass plate, and an antireflection film provided on the anti-glare layer, and has an image sharpness of DOI, a glossiness of G, and a haze.
  • Is H the glare index value is S
  • the reflection index value is C
  • the visibility parameter P in the following equation (1) is 150 or more and 2000 or less.
  • the cover glass further includes an antifouling layer provided on the antireflection film.
  • the digital signage of the present invention is characterized by including the above-mentioned cover glass.
  • FIG. 1 is a front sectional view of a cover glass according to an embodiment of the present invention.
  • FIG. 2 is a photograph of the cover glass of Comparative Example 1.
  • FIG. 3 is a photograph of the cover glass of Comparative Example 2.
  • FIG. 4 is a photograph of the cover glass of Example 1.
  • FIG. 5 is a photograph of the cover glass of Example 2.
  • FIG. 6 is a photograph of the cover glass of Example 3.
  • FIG. 7 is a photograph of the cover glass of Example 4.
  • FIG. 8 is a photograph of the cover glass of Example 1 and Comparative Example 2 under sunlight.
  • FIG. 1 is a front sectional view of a cover glass according to an embodiment of the present invention.
  • the cover glass 1 shown in FIG. 1 can be used for a display.
  • the cover glass 1 is provided on the glass plate 2, the anti-glare layer 3 provided on the glass plate 2, the anti-reflection film 4 provided on the anti-glare layer 3, and the anti-reflection film 4 as needed.
  • the antifouling layer 5 is provided. By providing the antireflection film 4 on the antiglare layer 3, the bright contrast of the cover glass 1 can be improved.
  • the glass plate 2 can be made of, for example, non-alkali glass, soda lime glass, borosilicate glass, aluminosilicate glass, chemically tempered glass, or the like.
  • the anti-glare layer 3 has an uneven structure.
  • the anti-glare layer 3 is provided to provide a so-called anti-glare effect that suppresses reflection of external light and the like.
  • the anti-glare layer 3 preferably has an uneven structure composed of an inorganic substance.
  • the inorganic substance constituting such an anti-glare layer 3 preferably contains oxides such as silica, alumina, zirconia, and titania, and can be formed from an inorganic paint.
  • oxides such as silica, alumina, zirconia, and titania
  • an inorganic paint As the main component of the inorganic coating material, a silica precursor, an alumina precursor, a zirconia precursor, a titania precursor, or the like can be used. Of these, silica precursors are particularly preferably used.
  • the inorganic paint may contain inorganic particles.
  • silica precursor examples include alkoxysilanes such as tetraethoxysilane and tetramethoxysilane, hydrolyzed condensates of alkoxysilane (sol-gel silica), and silazane. From the viewpoint of further enhancing the antiglare effect, tetraethoxysilane and the like. An alkoxysilane such as tetramethoxysilane and at least one of their hydrolyzed condensates are preferable, and a hydrolyzed condensate of tetraethoxysilane is more preferable.
  • alumina precursor examples include aluminum alkoxide, a hydrolyzed condensate of aluminum alkoxide, a water-soluble aluminum salt, and an aluminum chelate.
  • zirconia precursor examples include zirconium alkoxide and a hydrolyzed condensate of zirconium alkoxide.
  • titania precursor examples include titanium alkoxide and a hydrolyzed condensate of titanium alkoxide.
  • examples of the inorganic particles include silica particles, alumina particles, zirconia particles, titania particles and the like. Among these, silica particles are particularly preferably used.
  • the anti-glare layer 3 can be formed by applying the above-mentioned inorganic paint on the glass plate 2.
  • the inorganic paint can be applied onto the glass plate 2 by the spray coating method. After coating, it is dried and fired to form an anti-glare layer 3 made of an inorganic substance.
  • the average thickness of the anti-glare layer 3 is preferably 0.1 ⁇ m or more and 2 ⁇ m or less, more preferably 0.15 ⁇ m or more and 1.75 ⁇ m or less, and further preferably 0.2 ⁇ m or more and 1 ⁇ m or less. ..
  • the antireflection film 4 can be formed from, for example, a dielectric multilayer film.
  • a dielectric multilayer film a low refractive index layer made of a silicon oxide layer and a high one made of an oxide of at least one metal selected from the group consisting of niobium, titanium, zirconium, yttrium, tungsten, aluminum and hafnium.
  • a laminated film having a refractive index layer can be mentioned. It is preferable to have a niobium oxide layer as the high refractive index layer. It is preferable that the low refractive index layer and the high refractive index layer are alternately laminated.
  • each layer constituting the antireflection film 4 is preferably 1 nm or more and 300 nm or less, more preferably 2 nm or more and 200 nm or less, and further preferably 3 nm or more and 150 nm or less. Further, the total number of layers constituting the antireflection film 4 is preferably 2 or more and 6 or less. By setting the temperature within such a range, an effective and easily formable film can be obtained.
  • the antireflection film 4 can be formed by, for example, a sputtering method, a CVD method, a vacuum vapor deposition method, or the like.
  • the overall thickness of the antireflection film 4 is preferably 50 nm or more and 1000 nm or less, more preferably 75 nm or more and 750 nm or less, and further preferably 100 nm or more and 500 nm or less.
  • the antifouling layer 5 preferably contains an organosilicon compound.
  • the adhesion with the antireflection film 4 can be enhanced.
  • the antifouling layer 5 is difficult to peel off even after long-term use.
  • organosilicon compound examples include one or more compounds selected from a silane coupling agent, a silicone oil, a silicone resin, a silicone rubber, a hydrophobic silica, and a fluorine-containing organosilicon compound.
  • the thickness of the antifouling layer 5 is preferably 0.5 nm or more and 20 nm or less, more preferably 0.75 nm or more and 15 nm or less, and further preferably 1 nm or more and 10 nm or less.
  • the method for forming the antifouling layer 5 is not particularly limited, and for example, it can be formed by applying a diluted solution of an organosilicon compound or the like by a spray coating method or the like.
  • index values of visibility image sharpness (DOI: Digitaless of Image), glossiness (G: Gloss), haze (H: Haze), glare index value (S: Sparkle), and reflection index value (C: Sparkle) Clarity) and the like.
  • Image sharpness DOI is an index related to visual resolution or clarity. The smaller the image sharpness DOI, the more visually obscured, and the larger the image sharpness DOI, the more visually clear.
  • the image sharpness DOI is preferably 20% or more, more preferably 25% or more, and even more preferably 30% or more.
  • the upper limit of the image sharpness DOI is not particularly limited, but can be, for example, 90%.
  • Glossiness G is an index showing the degree of light reflection. The lower the glossiness G, the lower the degree of reflection and the better the visibility.
  • the glossiness G is preferably 100 or less, more preferably 80 or less, and even more preferably 60 or less.
  • the lower limit of the glossiness G is not particularly limited, but may be, for example, 15.
  • Haze H is an index of translucency, which indicates the degree of cloudiness of the translucent body. The lower the haze H, the lower the degree of cloudiness and the better the visibility.
  • the haze H is preferably 60% or less, more preferably 50% or less, and even more preferably 40% or less.
  • the lower limit of haze H is not particularly limited, but may be, for example, 10%.
  • the glare index value S indicates the degree to which RGB pixels and uneven brightness appear to flicker as a large number of light spots on a display or the like.
  • the lower the glare index value S the lower the degree of glare and the better the visibility.
  • the glare index value S is preferably 6% or less, more preferably 5% or less, and further preferably 4% or less.
  • the lower limit of the glare index value S is not particularly limited, but may be, for example, 1.5%.
  • the reflection index value C is an index indicating the degree to which outside light is reflected.
  • the reflection index value C is preferably 6% or less, more preferably 5% or less, and further preferably 4% or less.
  • the lower limit of the reflection index value C is not particularly limited, but may be, for example, 2%.
  • the visibility parameter P in the following formula (1) is 150 or more and 2000 or less when the visibility parameter is P. Thereby, the visibility can be effectively enhanced. This will be described below.
  • the haze H and the reflection index value C may have a trade-off relationship, or the image sharpness DOI and the reflection index value C may have a trade-off relationship. Therefore, in reality, it is difficult to set all of the image sharpness DOI, the glossiness G, the haze H, the glare index value S, and the reflection index value C as ideal values.
  • the outdoor environment for visibility under sunlight is very different from the indoor environment. Therefore, it is difficult to sufficiently improve the visibility of the display or the like outdoors with the conventional cover glass or the like.
  • the visibility parameter P is defined by the above equation (1). Although multiple factors such as image sharpness DOI, glossiness G, haze H, glare index value S, and reflection index value C have a complex effect on visibility, the visibility parameter P should be specified. Therefore, a complex index can be obtained. Further, in the present embodiment, the visibility parameter P is set to 150 or more and 2000 or less. That is, the inventor effectively enhances the visibility by keeping the image sharpness DOI, the glossiness G, the haze H, the glare index value S and the reflection index value C in a well-balanced manner so as to fall within this range. I found that I could do it.
  • the cover glass 1 is particularly preferably used for digital signage or the like arranged outdoors. However, the cover glass 1 is also suitably used for a display used indoors.
  • the visibility parameter P is preferably 200 or more, more preferably 300 or more, further preferably 400 or more, and even more preferably 500 or more.
  • the visibility parameter P is preferably 1750 or less, more preferably 1500 or less, further preferably 1000 or less, and even more preferably 800 or less. Thereby, the visibility can be further improved.
  • the anti-glare layer 3 is formed on the glass plate 2.
  • an inorganic paint for the anti-glare layer 3 can be applied onto the glass plate 2 by a spray coating method.
  • the nozzle used in the spray coating method include a two-fluid nozzle and a one-fluid nozzle.
  • the directions orthogonal to each other are defined as the x direction and the y direction.
  • the inorganic paint may be applied while moving the nozzle in the x direction, the nozzle may be moved in the y direction, and then the inorganic paint may be applied while moving the nozzle in the x direction again.
  • the firing temperature can be, for example, 160 ° C. or higher and 200 ° C. or lower.
  • the obtained glass plate with a coating film is washed with water.
  • the coated glass plate is dried, and then the coated glass plate is washed by plasma treatment. The above cleaning does not have to be performed.
  • the inorganic paint for the anti-glare layer 3 is applied again on the glass plate with a coating film. It is then dried and then fired. From the above, the anti-glare layer 3 can be formed.
  • the inorganic paint twice in this way, or by selecting the main component of the inorganic paint and adding inorganic particles as needed, the type of nozzle, atomized air pressure, and inorganic paint liquid.
  • the coating conditions such as the flow rate of the nozzle, the moving speed of the nozzle, the moving pitch of the nozzle, the temperature / humidity at the time of coating, the surface temperature of the glass plate, and the particle size of the droplets of the coating liquid sprayed from the nozzle.
  • the sex parameter P can be effectively adjusted, and the visibility parameter P can be adjusted more reliably within the range of 150 or more and 2000 or less.
  • the second application of the inorganic paint may be performed without firing and cleaning. Even in this case, the visibility parameter P can be effectively adjusted.
  • the inorganic paint does not necessarily have to be applied twice, and the anti-glare layer 3 may be formed by applying the inorganic paint once.
  • the antireflection film 4 is formed on the antiglare layer 3.
  • a low refractive index layer having a relatively low refractive index and a high refractive index layer having a relatively high refractive index are alternately alternately formed by a sputtering method, a CVD method, a vacuum vapor deposition method, or the like. Laminate. As a result, the antireflection film 4 can be formed.
  • the antifouling layer 5 is formed on the antireflection film 4.
  • the antifouling layer 5 can be formed, for example, by applying a diluted solution of an organosilicon compound or the like by a spray coating method or the like.
  • the visibility parameter P may be adjusted by adjusting the combination of the materials and film thicknesses of the antiglare layer 3, the antireflection film 4, and the antifouling layer 5.
  • the digital signage of the present invention includes the cover glass 1 and a display element.
  • the cover glass 1 may be any cover glass according to the present invention.
  • the display element has a display surface.
  • the display surface is a surface on which an image is displayed.
  • a cover glass 1 is provided on the display surface. Since the digital signage includes the cover glass 1 of the present invention, visibility can be effectively enhanced.
  • Example 1 First, a 100 mm square glass plate having a thickness of 0.5 mm, which was made of non-alkali glass, was prepared. Next, an inorganic paint containing an alkoxide such as tetraethoxysilane was applied onto the glass plate by a spray coating method.
  • the direction in which one piece of the main surface of the glass plate extends is defined as the x direction
  • the direction orthogonal to the x direction is defined as the y direction.
  • the moving speed of the nozzle in the x direction was 45 m / min
  • the flow rate of the inorganic paint was 4.8 g / min
  • the moving pitch of the nozzle in the y direction was 2 mm.
  • the humidity at the time of application was 54.7%
  • the air temperature was 19.6 ° C.
  • the inorganic paint on the glass plate was fired at 180 ° C. Next, the obtained glass plate with a coating film was washed with water. Next, the coated glass plate was dried, and then the coated glass plate was washed by plasma treatment.
  • the same inorganic paint as above was applied again by the spray coating method on the glass plate with a coating film.
  • the moving speed of the nozzle in the x direction was 45 m / min
  • the flow rate of the inorganic paint was 4.8 g / min
  • the moving pitch of the nozzle in the y direction was 2 mm.
  • the humidity at the time of application was 55.3%
  • the air temperature was 19.6 ° C.
  • the inorganic paint on the coated glass plate was fired at 180 ° C. As a result, an anti-glare layer was formed on the glass plate.
  • the average thickness of the anti-glare layer was 0.35 ⁇ m.
  • a low refractive index layer made of silicon oxide was formed on the antiglare layer by a sputtering method.
  • a high refractive index layer made of niobium oxide was formed on the low refractive index layer by a sputtering method.
  • an antireflection film composed of a laminate of a low refractive index layer and a high refractive index layer was formed on the antiglare layer.
  • the low refractive index layer was two layers, and the thickness of each layer was 35 nm and 78 nm in order from the glass plate side.
  • the high refractive index layer was two layers, and the thickness of each layer was 10 nm and 106 nm in order from the glass plate side.
  • the antireflection film as a whole was 229 nm.
  • a diluted solution of a fluorine-based antifouling liquid was applied onto the antireflection film by a spray coating method, and then dried to form an antifouling layer.
  • the thickness of the antifouling layer was 4 nm.
  • Example 2 When forming the anti-glare layer, a cover glass was produced in the same manner as in Example 1 except that the second inorganic paint was applied without firing and cleaning after the first application of the inorganic paint. Specifically, when forming the anti-glare layer, the same inorganic paint as in Example 1 was applied onto the glass plate by the spray coating method. The moving speed of the nozzle in the x direction was 45 m / min, the flow rate of the inorganic paint was 4.8 g / min, and the moving pitch of the nozzle in the y direction was 2 mm. Next, the same inorganic paint as above was applied again by the spray coating method on the inorganic paint applied on the glass plate.
  • the moving speed of the nozzle in the x direction was 45 m / min
  • the flow rate of the inorganic paint was 4.8 g / min
  • the moving pitch of the nozzle in the y direction was 2 mm.
  • the humidity at the time of application was 54.7%
  • the air temperature was 19.6 ° C.
  • the inorganic paint on the glass plate was fired at 180 ° C. As a result, an anti-glare layer was formed on the glass plate.
  • the average thickness of the anti-glare layer was 0.33 ⁇ m.
  • Example 3 A cover glass was produced in the same manner as in Example 1 except that the humidity and temperature at the time of the first and second application of the inorganic paint were different from those in Example 1 when the anti-glare layer was formed. Specifically, the humidity at the time of the first application of the inorganic paint was 50.9%, and the temperature was 19.9 ° C. The humidity at the time of the second application of the inorganic paint was 51.2%, and the temperature was 19.9 ° C. The average thickness of the anti-glare layer was 0.47 ⁇ m.
  • Example 4 A cover glass was produced in the same manner as in Example 2 except that the humidity and temperature at the time of applying the inorganic paint were different from those in Example 2 when the anti-glare layer was formed. Specifically, the humidity at the time of applying the inorganic paint was 50.9%, and the temperature was 19.9 ° C. The average thickness of the anti-glare layer was 0.49 ⁇ m.
  • Example 5 A cover glass was produced in the same manner as in Example 2 except that the humidity and temperature at the time of applying the inorganic paint were different from those in Example 2 when the anti-glare layer was formed. Specifically, the humidity at the time of applying the inorganic paint was 52.8%, and the temperature was 21.4 ° C.
  • Example 6 The same as in Example 2 except that the inorganic paint was applied once when the anti-glare layer was formed, and the conditions for applying the inorganic paint by the spray coating method and the humidity and temperature at the time of application were different from those in Example 2.
  • the moving speed of the nozzle in the x direction was 55 m / min
  • the flow rate of the inorganic paint was 4.8 g / min
  • the moving pitch of the nozzle in the y direction was 1 mm.
  • the humidity at the time of applying the inorganic paint was 52.8%
  • the temperature was 21.4 ° C.
  • Example 7 A cover glass was produced in the same manner as in Example 1 except that the conditions for applying the inorganic paint by the spray coating method and the humidity and temperature at the time of application were different from those in Example 1 when forming the anti-glare layer. Specifically, at the time of applying the inorganic paint for the first time and the second time, the moving speed of the nozzle in the x direction is 55 m / min, the flow rate of the inorganic paint is 4.8 g / min, and the moving pitch of the nozzle in the y direction. was 1 mm. The humidity at the time of the first and second application of the inorganic paint was 49.4%, and the temperature was 22.4 ° C.
  • Example 8 When forming the anti-glare layer, the inorganic paint was applied once, and the temperature of the glass plate at the time of applying the inorganic paint was different from that of Example 2.
  • a cover glass was produced in the same manner as in Example 2 except that the conditions for applying the inorganic paint by the spray coating method and the humidity and temperature at the time of application were different from those in Example 2. Specifically, when forming the anti-glare layer, the glass plate was heated and the surface temperature was set to 49.0 ° C., and the same inorganic paint as in Example 2 was applied onto the glass plate.
  • the moving speed of the nozzle in the x direction was 45 m / min
  • the flow rate of the inorganic paint was 4.8 g / min
  • the moving pitch of the nozzle in the y direction was 1 mm.
  • the humidity at the time of applying the inorganic paint was 52.2%, and the temperature was 20.0 ° C.
  • Example 9 A protective film was attached to the surface of the glass plate on the side where the anti-glare layer was not provided.
  • the glass plate was etched. Specifically, the glass plate was immersed in a 3% by weight hydrogen fluoride solution for 3 minutes. By performing the etching treatment in this way, dirt adhering to the surface of the glass plate was removed.
  • the surface of the glass plate was frosted. Specifically, the glass plate was immersed in a mixed solution of 15% by weight hydrogen fluoride and 15% by weight potassium fluoride. The immersion temperature was 23 ° C. and the immersion time was 60 seconds. As a result, an anti-glare layer was formed.
  • the glass plate was immersed in a 10% hydrogen fluoride solution for 6 minutes for etching. Then, the antireflection film and the antifouling layer were formed in the same manner as in Example 1 to obtain a cover glass.
  • Example 10 A protective film was attached to the surface of the glass plate on the side where the anti-glare layer was not provided. Next, sandblasting was performed on the surface on the side to which the protective film was not attached. Next, the glass plate was etched. Specifically, the glass plate was immersed in a 3% by weight hydrogen fluoride solution for 3 minutes. By performing the etching treatment in this way, dirt adhering to the surface of the glass plate was removed. Next, the surface of the glass plate was frosted. Specifically, the glass plate was immersed in a mixed solution of 15% by weight hydrogen fluoride and 15% by weight potassium fluoride. The immersion temperature was 23 ° C. and the immersion time was 360 seconds. As a result, an anti-glare layer was formed.
  • the glass plate was immersed in a 10% hydrogen fluoride solution for 6 minutes for etching. Then, the antireflection film and the antifouling layer were formed in the same manner as in Example 1 to obtain a cover glass.
  • Example 1 When forming the anti-glare layer, the cover glass was produced in the same manner as in Example 1 except that the inorganic paint was applied once and the conditions for applying the inorganic paint by the spray coating method were different from those in Example 1. .. Specifically, the moving speed of the nozzle in the x direction was 45 m / min, the flow rate of the inorganic paint was 2.0 g / min, and the moving pitch of the nozzle in the y direction was 5 mm.
  • Example 2 the inorganic paint on the glass plate was fired at 180 ° C. in the same manner as in Example 1. As a result, an anti-glare layer was formed on the glass plate.
  • the average thickness of the anti-glare layer was 0.05 ⁇ m.
  • Example 2 Examples except that the temperature of the glass plate when the inorganic paint was applied, the conditions for applying the inorganic paint by the spray coating method, and the humidity and temperature at the time of application were different from those of Example 2 when forming the anti-glare layer.
  • a cover glass was produced in the same manner as in 2. Specifically, when forming the anti-glare layer, the glass plate was heated and the surface temperature was set to 48.2 ° C., and the same inorganic paint as in Example 2 was applied onto the glass plate.
  • the moving speed of the nozzle in the x direction was 60 m / min
  • the flow rate of the inorganic paint was 4.8 g / min
  • the moving pitch of the nozzle in the y direction was 1 mm.
  • the humidity at the time of application was 52.0%, and the air temperature was 20.0 ° C.
  • the average thickness of the anti-glare layer was 1.1 ⁇ m.
  • Example 3 When forming the anti-glare layer, the inorganic paint was applied once, and the temperature of the glass plate at the time of applying the inorganic paint was different from that of Example 2.
  • a cover glass was produced in the same manner as in Example 2 except that the conditions for applying the inorganic paint by the spray coating method and the humidity and temperature at the time of application were different from those in Example 2.
  • the glass plate was heated and the surface temperature was set to 48.2 ° C., and the same inorganic paint as in Example 2 was applied onto the glass plate.
  • the moving speed of the nozzle in the x direction was 45 m / min
  • the flow rate of the inorganic paint was 4.8 g / min
  • the moving pitch of the nozzle in the y direction was 1 mm.
  • the humidity at the time of applying the inorganic paint was 52.0%, and the temperature was 20.0 ° C.
  • Comparative Example 4 A cover glass was produced in the same manner as in Comparative Example 3 except that the temperature of the glass plate when the inorganic paint was applied and the humidity when the inorganic paint was applied were different from those in Comparative Example 3 when forming the anti-glare layer. did. Specifically, when forming the anti-glare layer, the glass plate was heated to set the surface temperature to 43.8 ° C. The humidity at the time of applying the inorganic paint was 51.8%.
  • Example 5 A cover glass was produced in the same manner as in Example 9 except that the immersion time in the frost treatment was different from that in Example 9. Specifically, the immersion time in the frost treatment was set to 180 seconds.
  • the cover glass is the same as in Comparative Example 3 except that the temperature of the glass plate when the inorganic paint is applied and the humidity and temperature when the inorganic paint is applied are different from those of Comparative Example 3.
  • the glass plate was heated to set the surface temperature to 48.2 ° C.
  • the humidity at the time of applying the inorganic paint was 45.5%, and the temperature was 21.1 ° C.
  • Examples 1 to 8 and Comparative Examples 1 to 4 and 6 are summarized in Table 1 below.
  • the conditions of Examples 9 and 10 and Comparative Example 5 are separately shown in Table 2 below.
  • Image sharpness DOI was measured using SMS-1000 (manufactured by Display-Mestechnik & System) based on ASTM D 5767.
  • glossiness G the glossiness G at an incident angle of 60 ° on the cover glass was measured using Microgloss (60 °) (manufactured by BYK) based on JIS Z 8741: 1997.
  • Haze H was measured using NDH-5000 (manufactured by Nippon Denshoku Co., Ltd.) based on JIS K 7136: 2000.
  • the glare index value S was measured in a sparkle measurement mode using SMS-1000 (manufactured by Display-Mestechnik & System).
  • the number of pixels of the SMS-1000 CCD camera is 1296 ⁇ 966, the sensor size is 1/3 type, and the pixel size is 3.75 ⁇ 3.75 ⁇ m.
  • the focal length of the lens was set to 100 mm, the aperture diameter of the lens was set to 4.5 mm, the magnification ratio was set to 1: 1, and the permissible circle of confusion diameter was set to 53 ⁇ m.
  • the pattern mask was arranged so that the top surface was located at the focal position of the lens.
  • the reflection index value C was measured in a reflection distribution measurement mode using SMS-1000 (manufactured by Display-Mestechnik & System).
  • the incident angle of the incident light is set to 3 °
  • the distance from the irradiation position on the cover glass of the examples and the comparative examples to the lens is set to 410 mm
  • the cover glasses of the examples and the comparative examples It was measured by sticking it on a blackboard glass with an immersion liquid having a refractive index of 1.53 on the back surface of the lens.
  • the visibility parameter P is in the range of 150 or more and 2000 or less. In particular, in Examples 1 to 6, 8 and 10, it can be seen that the visibility parameter P is in the range of 200 or more and 2000 or less. On the other hand, the visibility parameter P of Comparative Example 1 is higher than 2000, and Comparative Examples 2 to 6 are lower than 150.
  • FIG. 2 is a photograph of the cover glass of Comparative Example 1.
  • FIG. 3 is a photograph of the cover glass of Comparative Example 2.
  • FIG. 4 is a photograph of the cover glass of Example 1.
  • FIG. 5 is a photograph of the cover glass of Example 2.
  • FIG. 6 is a photograph of the cover glass of Example 3.
  • FIG. 7 is a photograph of the cover glass of Example 4.
  • FIG. 8 is a photograph of the cover glass of Example 1 and Comparative Example 2 under sunlight.
  • Comparative Example 1 the visibility is low due to reflection, and in Comparative Example 2, the visibility is low due to the resolution. As shown in FIG. 2, it can be seen that in Comparative Example 1, the degree of reflection of the illumination is large. As shown in FIG. 3, it can be seen that the characters are unclear in Comparative Example 2. Further, as shown in Table 4, in Comparative Examples 3, 4 and 6, the visibility is low in resolution, and in Comparative Example 5, the visibility is low in glare.
  • Example 4 it can be seen that in Examples 1 to 4, the reflection, glare, and resolution are all good. As shown in FIGS. 4 to 7, in Examples 1 to 4, the degree of reflection is not large, the characters are clear, and the glare is not noticeable. Further, as shown in FIG. 8, under sunlight, the characters are almost invisible in Comparative Example 2 and the visibility is low, whereas in the first embodiment, the characters are clearly visible and the visibility is high. As described above, it can be seen that the visibility is high in Examples 1 to 4. Similarly, as shown in Table 4, it can be seen that in Examples 5 to 10, the reflection, glare, and resolution are all good, and the visibility is high.

Abstract

Provided is a cover glass that is capable of effectively increasing visibility. The cover glass according to the present invention includes a glass plate 2, an anti-glare layer 3 provided on the glass plate 2, and an anti-reflection film 4 provided on the anti-glare layer 3, and is characterized in that, assuming that the image clarity is DOI, the gloss is G, the haze is H, the glitter index value is S, and the reflection index value is C, the visibility parameter P in equation (1) is 150-2000. Equation (1): P = (100000×DOI)/(G×H×S×C)

Description

カバーガラス及びデジタルサイネージCover glass and digital signage
　本発明は、カバーガラス及びそれを用いたデジタルサイネージに関する。 The present invention relates to a cover glass and digital signage using the same.
　カバーガラスは、携帯電話機、タブレット端末、テレビやデジタルサイネージ等のディスプレイに広く用いられている。このようなディスプレイの視認性は、外光の映り込みなどにより劣化することがある。そのため、ディスプレイの視認性を高める様々な試みがなされている。例えば、下記の特許文献１には、防眩性などを高めるための凹凸構造を有する、透光性構造体が開示されている。 Cover glass is widely used in displays such as mobile phones, tablet terminals, televisions and digital signage. The visibility of such a display may be deteriorated due to reflection of external light or the like. Therefore, various attempts have been made to improve the visibility of the display. For example, Patent Document 1 below discloses a translucent structure having a concavo-convex structure for enhancing antiglare and the like.
国際公開第２０１６／０２１５６０号International Publication No. 2016/021560
　例えば、デジタルサイネージ等は室外において太陽光の下で用いられることも多い。ディスプレイの太陽光の下における視認性は、室内における視認性と大きく異なる。近年、室外において用いられるディスプレイにおいても視認性のさらなる改善が要求されているが、特許文献１に記載の透光性構造体では、視認性を十分に高めることは困難である。 For example, digital signage is often used outdoors in sunlight. The visibility of a display in sunlight is very different from the visibility in a room. In recent years, further improvement in visibility has been required for displays used outdoors, but it is difficult to sufficiently improve visibility with the translucent structure described in Patent Document 1.
　本発明は、視認性を効果的に高めることができる、カバーガラス及びデジタルサイネージを提供することを目的とする。 An object of the present invention is to provide a cover glass and digital signage that can effectively enhance visibility.
　本発明のカバーガラスは、ガラス板と、ガラス板上に設けられているアンチグレア層と、アンチグレア層上に設けられている反射防止膜とを備え、像鮮明度をＤＯＩ、光沢度をＧ、ヘイズをＨ、ぎらつき指標値をＳ、映り込み指標値をＣとしたときに、下記の式（１）における視認性パラメータＰが、１５０以上、２０００以下であることを特徴とする。 The cover glass of the present invention includes a glass plate, an anti-glare layer provided on the glass plate, and an antireflection film provided on the anti-glare layer, and has an image sharpness of DOI, a glossiness of G, and a haze. Is H, the glare index value is S, and the reflection index value is C, the visibility parameter P in the following equation (1) is 150 or more and 2000 or less.
　Ｐ＝（１０００００×ＤＯＩ）／（Ｇ×Ｈ×Ｓ×Ｃ）…式（１） P = (100000 x DOI) / (G x H x S x C) ... Equation (1)
　上記カバーガラスは、反射防止膜上に設けられている防汚層をさらに備えることが好ましい。 It is preferable that the cover glass further includes an antifouling layer provided on the antireflection film.
　本発明のデジタルサイネージは、上記カバーガラスを備えることを特徴とする。 The digital signage of the present invention is characterized by including the above-mentioned cover glass.
　本発明によれば、視認性を効果的に高めることができる、カバーガラス及びデジタルサイネージを提供することができる。 According to the present invention, it is possible to provide a cover glass and digital signage that can effectively enhance visibility.
図１は、本発明の一実施形態に係るカバーガラスの正面断面図である。FIG. 1 is a front sectional view of a cover glass according to an embodiment of the present invention. 図２は、比較例１のカバーガラスの写真である。FIG. 2 is a photograph of the cover glass of Comparative Example 1. 図３は、比較例２のカバーガラスの写真である。FIG. 3 is a photograph of the cover glass of Comparative Example 2. 図４は、実施例１のカバーガラスの写真である。FIG. 4 is a photograph of the cover glass of Example 1. 図５は、実施例２のカバーガラスの写真である。FIG. 5 is a photograph of the cover glass of Example 2. 図６は、実施例３のカバーガラスの写真である。FIG. 6 is a photograph of the cover glass of Example 3. 図７は、実施例４のカバーガラスの写真である。FIG. 7 is a photograph of the cover glass of Example 4. 図８は、太陽光の下における、実施例１及び比較例２のカバーガラスの写真である。FIG. 8 is a photograph of the cover glass of Example 1 and Comparative Example 2 under sunlight.
　以下、好ましい実施形態について説明する。但し、以下の実施形態は単なる例示であり、本発明は以下の実施形態に限定されるものではない。また、各図面において、実質的に同一の機能を有する部材は同一の符号で参照する場合がある。 Hereinafter, preferred embodiments will be described. However, the following embodiments are merely examples, and the present invention is not limited to the following embodiments. Further, in each drawing, members having substantially the same function may be referred to by the same reference numerals.
　（カバーガラス）
　図１は、本発明の一実施形態に係るカバーガラスの正面断面図である。図１に示すカバーガラス１は、ディスプレイに用いることができる。カバーガラス１は、ガラス板２と、ガラス板２上に設けられているアンチグレア層３と、アンチグレア層３上に設けられている反射防止膜４と、必要に応じて反射防止膜４上に設けられている防汚層５とを備える。なお、反射防止膜４をアンチグレア層３上に設けることにより、カバーガラス１の明所コントラストを向上させることができる。 (cover glass)
FIG. 1 is a front sectional view of a cover glass according to an embodiment of the present invention. The cover glass 1 shown in FIG. 1 can be used for a display. The cover glass 1 is provided on the glass plate 2, the anti-glare layer 3 provided on the glass plate 2, the anti-reflection film 4 provided on the anti-glare layer 3, and the anti-reflection film 4 as needed. The antifouling layer 5 is provided. By providing the antireflection film 4 on the antiglare layer 3, the bright contrast of the cover glass 1 can be improved.
　ガラス板２は、例えば、無アルカリガラス、ソーダライムガラス、ホウケイ酸ガラス、アルミノシリケートガラス、化学強化ガラスなどにより構成することができる。 The glass plate 2 can be made of, for example, non-alkali glass, soda lime glass, borosilicate glass, aluminosilicate glass, chemically tempered glass, or the like.
　アンチグレア層３は、凹凸構造を有する。アンチグレア層３は、外光の映り込み等を抑制する、いわゆる防眩効果を付与するために設けられている。 The anti-glare layer 3 has an uneven structure. The anti-glare layer 3 is provided to provide a so-called anti-glare effect that suppresses reflection of external light and the like.
　アンチグレア層３は、無機物により構成された凹凸構造を有することが好ましい。このようなアンチグレア層３を構成する無機物は、例えば、シリカ、アルミナ、ジルコニア、チタニア等の酸化物を含むことが好ましく、無機塗料から形成することができる。無機塗料主成分としては、シリカ前駆体、アルミナ前駆体、ジルコニア前駆体、チタニア前駆体等を用いることができる。これらの中でも、シリカ前駆体が特に好ましく用いられる。なお、無機塗料は、無機粒子を含んでもよい。 The anti-glare layer 3 preferably has an uneven structure composed of an inorganic substance. The inorganic substance constituting such an anti-glare layer 3 preferably contains oxides such as silica, alumina, zirconia, and titania, and can be formed from an inorganic paint. As the main component of the inorganic coating material, a silica precursor, an alumina precursor, a zirconia precursor, a titania precursor, or the like can be used. Of these, silica precursors are particularly preferably used. The inorganic paint may contain inorganic particles.
　シリカ前駆体としては、テトラエトキシシラン、テトラメトキシシラン等のアルコキシシラン、アルコキシシランの加水分解縮合物（ゾルゲルシリカ）、シラザン等が挙げられ、防眩効果をより高める観点からは、テトラエトキシシラン、テトラメトキシシラン等のアルコキシシラン、それらの加水分解縮合物の少なくとも一種が好ましく、テトラエトキシシランの加水分解縮合物がより好ましい。 Examples of the silica precursor include alkoxysilanes such as tetraethoxysilane and tetramethoxysilane, hydrolyzed condensates of alkoxysilane (sol-gel silica), and silazane. From the viewpoint of further enhancing the antiglare effect, tetraethoxysilane and the like. An alkoxysilane such as tetramethoxysilane and at least one of their hydrolyzed condensates are preferable, and a hydrolyzed condensate of tetraethoxysilane is more preferable.
　アルミナ前駆体としては、アルミニウムアルコキシド、アルミニウムアルコキシドの加水分解縮合物、水溶性アルミニウム塩、アルミニウムキレート等が挙げられる。 Examples of the alumina precursor include aluminum alkoxide, a hydrolyzed condensate of aluminum alkoxide, a water-soluble aluminum salt, and an aluminum chelate.
　ジルコニア前駆体としては、ジルコニウムアルコキシド、ジルコニウムアルコキシドの加水分解縮合物等が挙げられる。 Examples of the zirconia precursor include zirconium alkoxide and a hydrolyzed condensate of zirconium alkoxide.
　チタニア前駆体としては、チタンアルコキシド、チタンアルコキシドの加水分解縮合物等が挙げられる。 Examples of the titania precursor include titanium alkoxide and a hydrolyzed condensate of titanium alkoxide.
　無機粒子としては、例えば、シリカ粒子、アルミナ粒子、ジルコニア粒子、チタニア粒子等が挙げられる。これらの中でも、シリカ粒子が特に好ましく用いられる。 Examples of the inorganic particles include silica particles, alumina particles, zirconia particles, titania particles and the like. Among these, silica particles are particularly preferably used.
　アンチグレア層３は、上記無機塗料をガラス板２上に塗布することにより形成することができる。例えば、スプレーコート法により上記無機塗料をガラス板２上に塗布することができる。塗布した後、乾燥し、焼成することにより無機物からなるアンチグレア層３を形成する。 The anti-glare layer 3 can be formed by applying the above-mentioned inorganic paint on the glass plate 2. For example, the inorganic paint can be applied onto the glass plate 2 by the spray coating method. After coating, it is dried and fired to form an anti-glare layer 3 made of an inorganic substance.
　アンチグレア層３の平均厚みは、０．１μｍ以上、２μｍ以下であることが好ましく、０．１５μｍ以上、１．７５μｍ以下であることがより好ましく、０．２μｍ以上、１μｍ以下であることがさらに好ましい。 The average thickness of the anti-glare layer 3 is preferably 0.1 μm or more and 2 μm or less, more preferably 0.15 μm or more and 1.75 μm or less, and further preferably 0.2 μm or more and 1 μm or less. ..
　反射防止膜４は、例えば、誘電体多層膜から形成することができる。このような誘電体多層膜として、酸化ケイ素層からなる低屈折率層と、ニオブ、チタン、ジルコニウム、イットリウム、タングステン、アルミニウム及びハフニウムからなる群より選ばれる少なくとも１種の金属の酸化物からなる高屈折率層とを有する積層膜が挙げられる。上記高屈折率層として、ニオブの酸化物層を有することが好ましい。上記低屈折率層と上記高屈折率層とは交互に積層されていることが好ましい。 The antireflection film 4 can be formed from, for example, a dielectric multilayer film. As such a dielectric multilayer film, a low refractive index layer made of a silicon oxide layer and a high one made of an oxide of at least one metal selected from the group consisting of niobium, titanium, zirconium, yttrium, tungsten, aluminum and hafnium. A laminated film having a refractive index layer can be mentioned. It is preferable to have a niobium oxide layer as the high refractive index layer. It is preferable that the low refractive index layer and the high refractive index layer are alternately laminated.
　反射防止膜４を構成する各層の厚みは、１ｎｍ以上、３００ｎｍ以下であることが好ましく、２ｎｍ以上、２００ｎｍ以下であることがより好ましく、３ｎｍ以上、１５０ｎｍ以下であることがさらに好ましい。また、反射防止膜４を構成する層の総数は、２層以上、６層以下であることが好ましい。このような範囲内にすることにより、効果的で、かつ簡易に形成可能な膜にすることができる。 The thickness of each layer constituting the antireflection film 4 is preferably 1 nm or more and 300 nm or less, more preferably 2 nm or more and 200 nm or less, and further preferably 3 nm or more and 150 nm or less. Further, the total number of layers constituting the antireflection film 4 is preferably 2 or more and 6 or less. By setting the temperature within such a range, an effective and easily formable film can be obtained.
　反射防止膜４は、例えば、スパッタリング法、ＣＶＤ法または真空蒸着法等により形成することができる。反射防止膜４の全体の厚みは、５０ｎｍ以上、１０００ｎｍ以下であることが好ましく、７５ｎｍ以上、７５０ｎｍ以下であることがより好ましく、１００ｎｍ以上、５００ｎｍ以下であることがさらに好ましい。 The antireflection film 4 can be formed by, for example, a sputtering method, a CVD method, a vacuum vapor deposition method, or the like. The overall thickness of the antireflection film 4 is preferably 50 nm or more and 1000 nm or less, more preferably 75 nm or more and 750 nm or less, and further preferably 100 nm or more and 500 nm or less.
　防汚層５は、有機ケイ素化合物を含むことが好ましい。有機ケイ素化合物を含むことにより、反射防止膜４との密着性を高めることができる。これにより、長期間の使用によっても、防汚層５が剥離し難い。 The antifouling layer 5 preferably contains an organosilicon compound. By containing the organosilicon compound, the adhesion with the antireflection film 4 can be enhanced. As a result, the antifouling layer 5 is difficult to peel off even after long-term use.
　有機ケイ素化合物としては、例えば、シランカップリング剤、シリコーンオイル、シリコーンレジン、シリコーンゴム、疎水性シリカ、及びフッ素含有有機ケイ素化合物から選択される１つ以上の化合物を挙げることができる。 Examples of the organosilicon compound include one or more compounds selected from a silane coupling agent, a silicone oil, a silicone resin, a silicone rubber, a hydrophobic silica, and a fluorine-containing organosilicon compound.
　防汚層５の厚みは、０．５ｎｍ以上、２０ｎｍ以下であることが好ましく、０．７５ｎｍ以上、１５ｎｍ以下であることがより好ましく、１ｎｍ以上、１０ｎｍ以下であることがさらに好ましい。 The thickness of the antifouling layer 5 is preferably 0.5 nm or more and 20 nm or less, more preferably 0.75 nm or more and 15 nm or less, and further preferably 1 nm or more and 10 nm or less.
　防汚層５の形成方法は、特に限定されるものではなく、例えば、有機ケイ素化合物等の希釈液をスプレーコート法などにより塗布することにより形成することができる。 The method for forming the antifouling layer 5 is not particularly limited, and for example, it can be formed by applying a diluted solution of an organosilicon compound or the like by a spray coating method or the like.
　視認性の指標値として、像鮮明度（ＤＯＩ：Ｄｉｓｔｉｎｃｔｎｅｓｓ　ｏｆ　Ｉｍａｇｅ）、光沢度（Ｇ：Ｇｌｏｓｓ）、ヘイズ（Ｈ：Ｈａｚｅ）、ぎらつき指標値（Ｓ：Ｓｐａｒｋｌｅ）及び映り込み指標値（Ｃ：Ｃｌａｒｉｔｙ）等が挙げられる。 As the index values of visibility, image sharpness (DOI: Digitaless of Image), glossiness (G: Gloss), haze (H: Haze), glare index value (S: Sparkle), and reflection index value (C: Sparkle) Clarity) and the like.
　像鮮明度ＤＯＩは、視覚的な解像度、あるいは明瞭性に関する指標である。像鮮明度ＤＯＩが小さいほど視覚的に不明瞭となり、像鮮明度ＤＯＩが大きいほど視覚的に明瞭となる。像鮮明度ＤＯＩは、２０％以上であることが好ましく、２５％以上であることがより好ましく、３０％以上であることがさらに好ましい。なお、像鮮明度ＤＯＩの上限値は特に限定されないが、例えば、９０％とすることができる。 Image sharpness DOI is an index related to visual resolution or clarity. The smaller the image sharpness DOI, the more visually obscured, and the larger the image sharpness DOI, the more visually clear. The image sharpness DOI is preferably 20% or more, more preferably 25% or more, and even more preferably 30% or more. The upper limit of the image sharpness DOI is not particularly limited, but can be, for example, 90%.
　光沢度Ｇは、光の反射の程度を示す指標である。光沢度Ｇが低いほど、反射の度合いが低く、視認性が良好となる。光沢度Ｇは、１００以下であることが好ましく、８０以下であることがより好ましく、６０以下であることがさらに好ましい。なお、光沢度Ｇの下限値は特に限定されないが、例えば、１５とすることができる。 Glossiness G is an index showing the degree of light reflection. The lower the glossiness G, the lower the degree of reflection and the better the visibility. The glossiness G is preferably 100 or less, more preferably 80 or less, and even more preferably 60 or less. The lower limit of the glossiness G is not particularly limited, but may be, for example, 15.
　ヘイズＨは、透光体のくもりの程度を示す、透光性の指標である。ヘイズＨが低いほどくもりの度合いが低く、視認性が良好となる。ヘイズＨは、６０％以下であることが好ましく、５０％以下であることがより好ましく、４０％以下であることがさらに好ましい。なお、ヘイズＨの下限値は特に限定されないが、例えば、１０％とすることができる。 Haze H is an index of translucency, which indicates the degree of cloudiness of the translucent body. The lower the haze H, the lower the degree of cloudiness and the better the visibility. The haze H is preferably 60% or less, more preferably 50% or less, and even more preferably 40% or less. The lower limit of haze H is not particularly limited, but may be, for example, 10%.
　ぎらつき指標値Ｓは、ディスプレイ等において、ＲＧＢの画素や明るさのムラが多数の光点等としてチラついて見える程度を示す。ぎらつき指標値Ｓが低いほど、ぎらつきの度合いが低く、視認性が良好となる。ぎらつき指標値Ｓは、６％以下であることが好ましく、５％以下であることがより好ましく、４％以下であることがさらに好ましい。なお、ぎらつき指標値Ｓの下限値は特に限定されないが、例えば、１．５％とすることができる。 The glare index value S indicates the degree to which RGB pixels and uneven brightness appear to flicker as a large number of light spots on a display or the like. The lower the glare index value S, the lower the degree of glare and the better the visibility. The glare index value S is preferably 6% or less, more preferably 5% or less, and further preferably 4% or less. The lower limit of the glare index value S is not particularly limited, but may be, for example, 1.5%.
　映り込み指標値Ｃは、外光が映り込む程度を示す指標である。映り込み指標値Ｃが低いほど、外光が映り込む度合いが低く、視認性が良好となる。映り込み指標値Ｃは、６％以下であることが好ましく、５％以下であることがより好ましく、４％以下であることがさらに好ましい。なお、映り込み指標値Ｃの下限値は特に限定されないが、例えば、２％とすることができる。 The reflection index value C is an index indicating the degree to which outside light is reflected. The lower the reflection index value C, the lower the degree of reflection of external light and the better the visibility. The reflection index value C is preferably 6% or less, more preferably 5% or less, and further preferably 4% or less. The lower limit of the reflection index value C is not particularly limited, but may be, for example, 2%.
　本実施形態の特徴は、視認性パラメータをＰとしたときに、下記の式（１）における視認性パラメータＰが、１５０以上、２０００以下であることにある。それによって、視認性を効果的に高めることができる。これを、以下において説明する。 The feature of this embodiment is that the visibility parameter P in the following formula (1) is 150 or more and 2000 or less when the visibility parameter is P. Thereby, the visibility can be effectively enhanced. This will be described below.
　Ｐ＝（１０００００×ＤＯＩ）／（Ｇ×Ｈ×Ｓ×Ｃ）…式（１） P = (100000 x DOI) / (G x H x S x C) ... Equation (1)
　上記のように、像鮮明度ＤＯＩは高いほど好ましく、光沢度Ｇ、ヘイズＨ、ぎらつき指標値Ｓ及び映り込み指標値Ｃは低いほど好ましい。しかしながら、ヘイズＨと映り込み指標値Ｃとはトレードオフの関係にあり、あるいは、像鮮明度ＤＯＩと映り込み指標値Ｃとがトレードオフの関係となることもある。そのため、実際には、像鮮明度ＤＯＩ、光沢度Ｇ、ヘイズＨ、ぎらつき指標値Ｓ及び映り込み指標値Ｃの全てを理想的な値とすることは困難である。さらに、室外における太陽光の下の視認性に関する環境は、室内の環境とは大きく異なる。そのため、従来のカバーガラス等によっては、室外におけるディスプレイ等の視認性をも十分に高めることは困難である。 As described above, the higher the image sharpness DOI is, the more preferable it is, and the lower the glossiness G, haze H, glare index value S and reflection index value C are preferable. However, the haze H and the reflection index value C may have a trade-off relationship, or the image sharpness DOI and the reflection index value C may have a trade-off relationship. Therefore, in reality, it is difficult to set all of the image sharpness DOI, the glossiness G, the haze H, the glare index value S, and the reflection index value C as ideal values. Furthermore, the outdoor environment for visibility under sunlight is very different from the indoor environment. Therefore, it is difficult to sufficiently improve the visibility of the display or the like outdoors with the conventional cover glass or the like.
　これに対して、本実施形態においては、上記式（１）により視認性パラメータＰを規定している。視認性に対しては、像鮮明度ＤＯＩ、光沢度Ｇ、ヘイズＨ、ぎらつき指標値Ｓ及び映り込み指標値Ｃといった複数の要素が複合的に影響するが、視認性パラメータＰを規定することにより、複合的な指標を得ることができる。さらに、本実施形態では、視認性パラメータＰを１５０以上、２０００以下としている。つまり、発明者はこの範囲になるように、像鮮明度ＤＯＩ、光沢度Ｇ、ヘイズＨ、ぎらつき指標値Ｓ及び映り込み指標値Ｃをバランスよく保つことにより、視認性を効果的に高めることができることを見出した。カバーガラス１は、室外に配置されるデジタルサイネージ等に特に好適に用いられる。もっとも、カバーガラス１は、室内において使用されるディスプレイにも好適に用いられる。 On the other hand, in the present embodiment, the visibility parameter P is defined by the above equation (1). Although multiple factors such as image sharpness DOI, glossiness G, haze H, glare index value S, and reflection index value C have a complex effect on visibility, the visibility parameter P should be specified. Therefore, a complex index can be obtained. Further, in the present embodiment, the visibility parameter P is set to 150 or more and 2000 or less. That is, the inventor effectively enhances the visibility by keeping the image sharpness DOI, the glossiness G, the haze H, the glare index value S and the reflection index value C in a well-balanced manner so as to fall within this range. I found that I could do it. The cover glass 1 is particularly preferably used for digital signage or the like arranged outdoors. However, the cover glass 1 is also suitably used for a display used indoors.
　視認性パラメータＰは２００以上であることが好ましく、３００以上であることがより好ましく、４００以上であることがさらに好ましく、５００以上であることがより一層好ましい。また、視認性パラメータＰは１７５０以下であることが好ましく、１５００以下であることがより好ましく、１０００以下であることがさらに好ましく、８００以下であることがより一層好ましい。それによって、視認性をより一層高めることができる。 The visibility parameter P is preferably 200 or more, more preferably 300 or more, further preferably 400 or more, and even more preferably 500 or more. The visibility parameter P is preferably 1750 or less, more preferably 1500 or less, further preferably 1000 or less, and even more preferably 800 or less. Thereby, the visibility can be further improved.
　図１を参照して、本発明に係るカバーガラスの製造方法の一例を以下において説明する。 An example of a method for manufacturing a cover glass according to the present invention will be described below with reference to FIG.
　（カバーガラスの製造方法）
　まず、ガラス板２上に、アンチグレア層３を形成する。アンチグレア層３の形成に際し、例えば、スプレーコート法により、アンチグレア層３用の無機塗料をガラス板２上に塗布することができる。スプレーコート法に用いるノズルの例としては、２流体ノズル、１流体ノズル等が挙げられる。ここで、互いに直交する方向をｘ方向及びｙ方向とする。例えば、ｘ方向にノズルを移動させながら無機塗料を塗布した後、ｙ方向にノズルを移動させて、その後再度ｘ方向にノズルを移動させながら無機塗料を塗布することを繰り返してもよい。無機塗料を塗布した後、乾燥し、その後焼成する。該焼成の温度としては、例えば、１６０℃以上、２００℃以下とすることができる。 (Manufacturing method of cover glass)
First, the anti-glare layer 3 is formed on the glass plate 2. When forming the anti-glare layer 3, for example, an inorganic paint for the anti-glare layer 3 can be applied onto the glass plate 2 by a spray coating method. Examples of the nozzle used in the spray coating method include a two-fluid nozzle and a one-fluid nozzle. Here, the directions orthogonal to each other are defined as the x direction and the y direction. For example, the inorganic paint may be applied while moving the nozzle in the x direction, the nozzle may be moved in the y direction, and then the inorganic paint may be applied while moving the nozzle in the x direction again. After applying the inorganic paint, it is dried and then fired. The firing temperature can be, for example, 160 ° C. or higher and 200 ° C. or lower.
　次に、得られた塗膜付きガラス板を水により洗浄する。次に、塗膜付きガラス板を乾燥させ、その後、塗膜付きガラス板をプラズマ処理により洗浄する。なお、上記洗浄は必ずしも行わなくともよい。 Next, the obtained glass plate with a coating film is washed with water. Next, the coated glass plate is dried, and then the coated glass plate is washed by plasma treatment. The above cleaning does not have to be performed.
　次に、塗膜付きガラス板上に、再度アンチグレア層３用の無機塗料を塗布する。次に、乾燥し、その後焼成する。以上により、アンチグレア層３を形成することができる。このように無機塗料を２度塗布することにより、あるいは、無機塗料についてその主成分を選択し、必要に応じて無機粒子を加えることにより、また、ノズルの種類、霧化エア圧、無機塗料液の流量、ノズルの移動速度、ノズルの移動ピッチ、塗布時の気温・湿度、ガラス板の表面温度、ノズルから噴射される塗料液の液滴の粒径等の塗布条件を調整することにより、視認性パラメータＰを効果的に調整することができ、視認性パラメータＰを１５０以上、２０００以下の範囲内に、より確実に調整することができる。 Next, the inorganic paint for the anti-glare layer 3 is applied again on the glass plate with a coating film. It is then dried and then fired. From the above, the anti-glare layer 3 can be formed. By applying the inorganic paint twice in this way, or by selecting the main component of the inorganic paint and adding inorganic particles as needed, the type of nozzle, atomized air pressure, and inorganic paint liquid. By adjusting the coating conditions such as the flow rate of the nozzle, the moving speed of the nozzle, the moving pitch of the nozzle, the temperature / humidity at the time of coating, the surface temperature of the glass plate, and the particle size of the droplets of the coating liquid sprayed from the nozzle. The sex parameter P can be effectively adjusted, and the visibility parameter P can be adjusted more reliably within the range of 150 or more and 2000 or less.
　あるいは、１度目の無機塗料の塗布後に、焼成及び洗浄を行わずに、２度目の無機塗料の塗布を行ってもよい。この場合においても、視認性パラメータＰを効果的に調整することができる。なお、無機塗料の塗布は必ずしも２度行わなくともよく、１度の塗布によりアンチグレア層３を形成してもよい。 Alternatively, after the first application of the inorganic paint, the second application of the inorganic paint may be performed without firing and cleaning. Even in this case, the visibility parameter P can be effectively adjusted. The inorganic paint does not necessarily have to be applied twice, and the anti-glare layer 3 may be formed by applying the inorganic paint once.
　次に、アンチグレア層３上に反射防止膜４を形成する。反射防止膜４の形成に際し、例えば、スパッタリング法、ＣＶＤ法または真空蒸着法等により、相対的に低屈折率である低屈折率層及び相対的に高屈折率である高屈折率層を交互に積層する。これにより、反射防止膜４を形成することができる。 Next, the antireflection film 4 is formed on the antiglare layer 3. In forming the antireflection film 4, for example, a low refractive index layer having a relatively low refractive index and a high refractive index layer having a relatively high refractive index are alternately alternately formed by a sputtering method, a CVD method, a vacuum vapor deposition method, or the like. Laminate. As a result, the antireflection film 4 can be formed.
　次に、反射防止膜４上に防汚層５を形成する。防汚層５は、例えば、有機ケイ素化合物等の希釈液をスプレーコート法などにより塗布することにより形成することができる。 Next, the antifouling layer 5 is formed on the antireflection film 4. The antifouling layer 5 can be formed, for example, by applying a diluted solution of an organosilicon compound or the like by a spray coating method or the like.
　カバーガラス１における上記各層の形成に際し、アンチグレア層３、反射防止膜４及び防汚層５の材料及び膜厚の組み合わせを調整することにより、視認性パラメータＰを調整してもよい。 When forming each of the above layers in the cover glass 1, the visibility parameter P may be adjusted by adjusting the combination of the materials and film thicknesses of the antiglare layer 3, the antireflection film 4, and the antifouling layer 5.
　（デジタルサイネージ）
　本発明のデジタルサイネージは、上記カバーガラス１と、表示素子とを備える。カバーガラス１は、本発明に係るカバーガラスであればよい。表示素子は表示面を有する。表示面は、画像が表示される面である。表示面上にカバーガラス１が設けられている。当該デジタルサイネージは、本発明のカバーガラス１を備えるため、視認性を効果的に高めることができる。 (Digital signage)
The digital signage of the present invention includes the cover glass 1 and a display element. The cover glass 1 may be any cover glass according to the present invention. The display element has a display surface. The display surface is a surface on which an image is displayed. A cover glass 1 is provided on the display surface. Since the digital signage includes the cover glass 1 of the present invention, visibility can be effectively enhanced.
　以下、実施例を示すことにより、本発明に係るカバーガラスの効果をより詳細に説明する。 Hereinafter, the effect of the cover glass according to the present invention will be described in more detail by showing examples.
　＜実施例＞
　（実施例１）
　まず、無アルカリガラスにより構成された、１００ｍｍ角の、厚みが０．５ｍｍであるガラス板を用意した。次に、ガラス板上に、テトラエトキシシラン等のアルコキシドを含む無機塗料を、スプレーコート法により塗布した。ここで、ガラス板の主面の一片が延びる方向をｘ方向とし、ｘ方向に直交する方向をｙ方向とする。ｘ方向にノズルを移動させながら無機塗料を塗布した後、ノズルをｙ方向に移動させ、その後再度ｘ方向にノズルを移動させながら無機塗料を塗布することを繰り返した。ノズルのｘ方向の移動速度は４５ｍ／ｍｉｎとし、無機塗料の流量は４．８ｇ／ｍｉｎとし、ノズルのｙ方向の移動ピッチは２ｍｍとした。塗布時の湿度は５４．７％であり、気温は１９．６℃であった。 <Example>
(Example 1)
First, a 100 mm square glass plate having a thickness of 0.5 mm, which was made of non-alkali glass, was prepared. Next, an inorganic paint containing an alkoxide such as tetraethoxysilane was applied onto the glass plate by a spray coating method. Here, the direction in which one piece of the main surface of the glass plate extends is defined as the x direction, and the direction orthogonal to the x direction is defined as the y direction. After applying the inorganic paint while moving the nozzle in the x direction, the nozzle was moved in the y direction, and then the inorganic paint was repeatedly applied while moving the nozzle in the x direction again. The moving speed of the nozzle in the x direction was 45 m / min, the flow rate of the inorganic paint was 4.8 g / min, and the moving pitch of the nozzle in the y direction was 2 mm. The humidity at the time of application was 54.7%, and the air temperature was 19.6 ° C.
　次に、ガラス板上の無機塗料を１８０℃において焼成した。次に、得られた塗膜付きガラス板を水により洗浄した。次に、塗膜付きガラス板を乾燥させ、その後、塗膜付きガラス板をプラズマ処理により洗浄した。 Next, the inorganic paint on the glass plate was fired at 180 ° C. Next, the obtained glass plate with a coating film was washed with water. Next, the coated glass plate was dried, and then the coated glass plate was washed by plasma treatment.
　次に、塗膜付きガラス板上に、再度スプレーコート法によって上記と同様の無機塗料を塗布した。ノズルのｘ方向の移動速度は４５ｍ／ｍｉｎとし、無機塗料の流量は４．８ｇ／ｍｉｎとし、ノズルのｙ方向の移動ピッチは２ｍｍとした。塗布時の湿度は５５．３％であり、気温は１９．６℃であった。次に、塗膜付きガラス板上の無機塗料を１８０℃において焼成した。以上により、ガラス板上にアンチグレア層を形成した。アンチグレア層の平均厚みは０．３５μｍであった。 Next, the same inorganic paint as above was applied again by the spray coating method on the glass plate with a coating film. The moving speed of the nozzle in the x direction was 45 m / min, the flow rate of the inorganic paint was 4.8 g / min, and the moving pitch of the nozzle in the y direction was 2 mm. The humidity at the time of application was 55.3%, and the air temperature was 19.6 ° C. Next, the inorganic paint on the coated glass plate was fired at 180 ° C. As a result, an anti-glare layer was formed on the glass plate. The average thickness of the anti-glare layer was 0.35 μm.
　次に、アンチグレア層上に、スパッタリング法により、酸化ケイ素からなる低屈折率層を形成した。次に、低屈折率層上に、スパッタリング法により、酸化ニオブからなる高屈折率層を形成した。これらを繰り返すことにより、アンチグレア層上に、低屈折率層及び高屈折率層の積層体からなる、反射防止膜を形成した。低屈折率層は２層とし、各層の厚みはガラス板側から順に３５ｎｍ、７８ｎｍであった。高屈折率層は２層とし、各層の厚みはガラス板側から順に１０ｎｍ、１０６ｎｍであった。なお、反射防止膜全体としては、２２９ｎｍであった。 Next, a low refractive index layer made of silicon oxide was formed on the antiglare layer by a sputtering method. Next, a high refractive index layer made of niobium oxide was formed on the low refractive index layer by a sputtering method. By repeating these steps, an antireflection film composed of a laminate of a low refractive index layer and a high refractive index layer was formed on the antiglare layer. The low refractive index layer was two layers, and the thickness of each layer was 35 nm and 78 nm in order from the glass plate side. The high refractive index layer was two layers, and the thickness of each layer was 10 nm and 106 nm in order from the glass plate side. The antireflection film as a whole was 229 nm.
　次に、反射防止膜上に、フッ素系防汚液の希釈液をスプレーコート法により塗布し、その後乾燥させることにより、防汚層を形成した。防汚層の厚みは４ｎｍであった。 Next, a diluted solution of a fluorine-based antifouling liquid was applied onto the antireflection film by a spray coating method, and then dried to form an antifouling layer. The thickness of the antifouling layer was 4 nm.
　（実施例２）
　アンチグレア層の形成に際し、１度目の無機塗料の塗布後に、焼成及び洗浄を行わずに、２度目の無機塗料の塗布を行ったこと以外は実施例１と同様にしてカバーガラスを作製した。具体的には、アンチグレア層の形成に際し、ガラス板上に、実施例１と同様の無機塗料をスプレーコート法により塗布した。ノズルのｘ方向の移動速度は４５ｍ／ｍｉｎとし、無機塗料の流量は４．８ｇ／ｍｉｎとし、ノズルのｙ方向の移動ピッチは２ｍｍとした。次に、ガラス板上に塗布された無機塗料上に、再度スプレーコート法によって上記と同様の無機塗料を塗布した。ノズルのｘ方向の移動速度は４５ｍ／ｍｉｎとし、無機塗料の流量は４．８ｇ／ｍｉｎとし、ノズルのｙ方向の移動ピッチは２ｍｍとした。塗布時の湿度は５４．７％であり、気温は１９．６℃であった。 (Example 2)
When forming the anti-glare layer, a cover glass was produced in the same manner as in Example 1 except that the second inorganic paint was applied without firing and cleaning after the first application of the inorganic paint. Specifically, when forming the anti-glare layer, the same inorganic paint as in Example 1 was applied onto the glass plate by the spray coating method. The moving speed of the nozzle in the x direction was 45 m / min, the flow rate of the inorganic paint was 4.8 g / min, and the moving pitch of the nozzle in the y direction was 2 mm. Next, the same inorganic paint as above was applied again by the spray coating method on the inorganic paint applied on the glass plate. The moving speed of the nozzle in the x direction was 45 m / min, the flow rate of the inorganic paint was 4.8 g / min, and the moving pitch of the nozzle in the y direction was 2 mm. The humidity at the time of application was 54.7%, and the air temperature was 19.6 ° C.
　次に、ガラス板上の無機塗料を１８０℃において焼成した。以上により、ガラス板上にアンチグレア層を形成した。アンチグレア層の平均厚みは０．３３μｍであった。 Next, the inorganic paint on the glass plate was fired at 180 ° C. As a result, an anti-glare layer was formed on the glass plate. The average thickness of the anti-glare layer was 0.33 μm.
　（実施例３）
　アンチグレア層の形成に際し、１度目及び２度目の無機塗料の塗布時における湿度及び温度を実施例１と異ならせたこと以外においては、実施例１と同様にしてカバーガラスを作製した。具体的には、１度目の無機塗料の塗布時の湿度は５０．９％であり、温度は１９．９℃であった。２度目の無機塗料の塗布時の湿度は５１．２％であり、温度は１９．９℃であった。アンチグレア層の平均厚みは０．４７μｍであった。 (Example 3)
A cover glass was produced in the same manner as in Example 1 except that the humidity and temperature at the time of the first and second application of the inorganic paint were different from those in Example 1 when the anti-glare layer was formed. Specifically, the humidity at the time of the first application of the inorganic paint was 50.9%, and the temperature was 19.9 ° C. The humidity at the time of the second application of the inorganic paint was 51.2%, and the temperature was 19.9 ° C. The average thickness of the anti-glare layer was 0.47 μm.
　（実施例４）
　アンチグレア層の形成に際し、無機塗料の塗布時の湿度及び温度を実施例２と異ならせたこと以外においては、実施例２と同様にしてカバーガラスを作製した。具体的には、無機塗料の塗布時の湿度は５０．９％であり、温度は１９．９℃であった。アンチグレア層の平均厚みは０．４９μｍであった。 (Example 4)
A cover glass was produced in the same manner as in Example 2 except that the humidity and temperature at the time of applying the inorganic paint were different from those in Example 2 when the anti-glare layer was formed. Specifically, the humidity at the time of applying the inorganic paint was 50.9%, and the temperature was 19.9 ° C. The average thickness of the anti-glare layer was 0.49 μm.
　（実施例５）
　アンチグレア層の形成に際し、無機塗料の塗布時の湿度及び温度を実施例２と異ならせたこと以外においては、実施例２と同様にしてカバーガラスを作製した。具体的には、無機塗料の塗布時の湿度は５２．８％であり、温度は２１．４℃であった。 (Example 5)
A cover glass was produced in the same manner as in Example 2 except that the humidity and temperature at the time of applying the inorganic paint were different from those in Example 2 when the anti-glare layer was formed. Specifically, the humidity at the time of applying the inorganic paint was 52.8%, and the temperature was 21.4 ° C.
　（実施例６）
　アンチグレア層の形成に際し、無機塗料の塗布を１回とし、スプレーコート法による無機塗料の塗布の条件並びに塗布時の湿度及び温度を実施例２と異ならせたこと以外においては、実施例２と同様にしてカバーガラスを作製した。具体的には、ノズルのｘ方向の移動速度は５５ｍ／ｍｉｎとし、無機塗料の流量は４．８ｇ／ｍｉｎとし、ノズルのｙ方向の移動ピッチは１ｍｍとした。無機塗料の塗布時の湿度は５２．８％であり、温度は２１．４℃であった。 (Example 6)
The same as in Example 2 except that the inorganic paint was applied once when the anti-glare layer was formed, and the conditions for applying the inorganic paint by the spray coating method and the humidity and temperature at the time of application were different from those in Example 2. To make a cover glass. Specifically, the moving speed of the nozzle in the x direction was 55 m / min, the flow rate of the inorganic paint was 4.8 g / min, and the moving pitch of the nozzle in the y direction was 1 mm. The humidity at the time of applying the inorganic paint was 52.8%, and the temperature was 21.4 ° C.
　（実施例７）
　アンチグレア層の形成に際し、スプレーコート法による無機塗料の塗布の条件並びに塗布時の湿度及び温度を実施例１と異ならせたこと以外においては、実施例１と同様にしてカバーガラスを作製した。具体的には、１度目及び２度目の無機塗料の塗布時において、ノズルのｘ方向の移動速度は５５ｍ／ｍｉｎとし、無機塗料の流量は４．８ｇ／ｍｉｎとし、ノズルのｙ方向の移動ピッチは１ｍｍとした。１度目及び２度目の無機塗料の塗布時の湿度は４９．４％であり、温度は２２．４℃であった。 (Example 7)
A cover glass was produced in the same manner as in Example 1 except that the conditions for applying the inorganic paint by the spray coating method and the humidity and temperature at the time of application were different from those in Example 1 when forming the anti-glare layer. Specifically, at the time of applying the inorganic paint for the first time and the second time, the moving speed of the nozzle in the x direction is 55 m / min, the flow rate of the inorganic paint is 4.8 g / min, and the moving pitch of the nozzle in the y direction. Was 1 mm. The humidity at the time of the first and second application of the inorganic paint was 49.4%, and the temperature was 22.4 ° C.
　（実施例８）
　アンチグレア層の形成に際し、無機塗料の塗布を１回とし、無機塗料の塗布の際のガラス板の温度を実施例２と異ならせた。上記に加え、スプレーコート法による無機塗料の塗布の条件並びに塗布時の湿度及び温度を実施例２と異ならせたこと以外においては、実施例２と同様にしてカバーガラスを作製した。具体的には、アンチグレア層の形成に際し、ガラス板を加熱し、表面温度を４９．０℃とした状態において、実施例２と同様の無機塗料をガラス板上に塗布した。ノズルのｘ方向の移動速度は４５ｍ／ｍｉｎとし、無機塗料の流量は４．８ｇ／ｍｉｎとし、ノズルのｙ方向の移動ピッチは１ｍｍとした。無機塗料の塗布時の湿度は５２．２％であり、温度は２０．０℃であった。 (Example 8)
When forming the anti-glare layer, the inorganic paint was applied once, and the temperature of the glass plate at the time of applying the inorganic paint was different from that of Example 2. In addition to the above, a cover glass was produced in the same manner as in Example 2 except that the conditions for applying the inorganic paint by the spray coating method and the humidity and temperature at the time of application were different from those in Example 2. Specifically, when forming the anti-glare layer, the glass plate was heated and the surface temperature was set to 49.0 ° C., and the same inorganic paint as in Example 2 was applied onto the glass plate. The moving speed of the nozzle in the x direction was 45 m / min, the flow rate of the inorganic paint was 4.8 g / min, and the moving pitch of the nozzle in the y direction was 1 mm. The humidity at the time of applying the inorganic paint was 52.2%, and the temperature was 20.0 ° C.
　（実施例９）
　ガラス板における、アンチグレア層を設けない側の面に、保護フィルムを貼り付けた。次に、ガラス板にエッチング処理を行った。具体的には、３重量％のフッ化水素溶液にガラス板を３分間浸漬した。このようにエッチング処理を行うことにより、ガラス板の表面に付着した汚れを除去した。次に、ガラス板の表面をフロスト処理した。具体的には、１５重量％フッ化水素、１５重量％フッ化カリウム混合溶液に、ガラス板を浸漬した。浸漬温度は２３℃とし、浸漬時間は６０秒間とした。これにより、アンチグレア層を形成した。 (Example 9)
A protective film was attached to the surface of the glass plate on the side where the anti-glare layer was not provided. Next, the glass plate was etched. Specifically, the glass plate was immersed in a 3% by weight hydrogen fluoride solution for 3 minutes. By performing the etching treatment in this way, dirt adhering to the surface of the glass plate was removed. Next, the surface of the glass plate was frosted. Specifically, the glass plate was immersed in a mixed solution of 15% by weight hydrogen fluoride and 15% by weight potassium fluoride. The immersion temperature was 23 ° C. and the immersion time was 60 seconds. As a result, an anti-glare layer was formed.
　次に、１０％フッ化水素溶液にガラス板を６分間浸漬することによりエッチング処理した。その後、反射防止膜及び防汚層を、実施例１と同様にして形成し、カバーガラスを得た。 Next, the glass plate was immersed in a 10% hydrogen fluoride solution for 6 minutes for etching. Then, the antireflection film and the antifouling layer were formed in the same manner as in Example 1 to obtain a cover glass.
　（実施例１０）
　ガラス板における、アンチグレア層を設けない側の面に、保護フィルムを貼り付けた。次に、保護フィルムを貼り付けていない側の面に、サンドブラスト処理を行った。次に、ガラス板にエッチング処理を行った。具体的には、３重量％のフッ化水素溶液にガラス板を３分間浸漬した。このようにエッチング処理を行うことにより、ガラス板の表面に付着した汚れを除去した。次に、ガラス板の表面をフロスト処理した。具体的には、１５重量％フッ化水素、１５重量％フッ化カリウム混合溶液に、ガラス板を浸漬した。浸漬温度は２３℃とし、浸漬時間は３６０秒間とした。これにより、アンチグレア層を形成した。 (Example 10)
A protective film was attached to the surface of the glass plate on the side where the anti-glare layer was not provided. Next, sandblasting was performed on the surface on the side to which the protective film was not attached. Next, the glass plate was etched. Specifically, the glass plate was immersed in a 3% by weight hydrogen fluoride solution for 3 minutes. By performing the etching treatment in this way, dirt adhering to the surface of the glass plate was removed. Next, the surface of the glass plate was frosted. Specifically, the glass plate was immersed in a mixed solution of 15% by weight hydrogen fluoride and 15% by weight potassium fluoride. The immersion temperature was 23 ° C. and the immersion time was 360 seconds. As a result, an anti-glare layer was formed.
　次に、１０％フッ化水素溶液にガラス板を６分間浸漬することによりエッチング処理した。その後、反射防止膜及び防汚層を、実施例１と同様にして形成し、カバーガラスを得た。 Next, the glass plate was immersed in a 10% hydrogen fluoride solution for 6 minutes for etching. Then, the antireflection film and the antifouling layer were formed in the same manner as in Example 1 to obtain a cover glass.
　（比較例１）
　アンチグレア層の形成に際し、無機塗料の塗布を１回とし、スプレーコート法による無機塗料の塗布の条件を実施例１と異ならせたこと以外においては、実施例１と同様にしてカバーガラスを作製した。具体的には、ノズルのｘ方向の移動速度は４５ｍ／ｍｉｎとし、無機塗料の流量は２．０ｇ／ｍｉｎとし、ノズルのｙ方向の移動ピッチは５ｍｍとした。 (Comparative Example 1)
When forming the anti-glare layer, the cover glass was produced in the same manner as in Example 1 except that the inorganic paint was applied once and the conditions for applying the inorganic paint by the spray coating method were different from those in Example 1. .. Specifically, the moving speed of the nozzle in the x direction was 45 m / min, the flow rate of the inorganic paint was 2.0 g / min, and the moving pitch of the nozzle in the y direction was 5 mm.
　次に、ガラス板上の無機塗料を、実施例１と同様に１８０℃において焼成した。以上により、ガラス板上にアンチグレア層を形成した。アンチグレア層の平均厚みは０．０５μｍであった。 Next, the inorganic paint on the glass plate was fired at 180 ° C. in the same manner as in Example 1. As a result, an anti-glare layer was formed on the glass plate. The average thickness of the anti-glare layer was 0.05 μm.
　（比較例２）
　アンチグレア層の形成に際し、無機塗料の塗布の際のガラス板の温度、スプレーコート法による無機塗料の塗布の条件並びに塗布時の湿度及び温度を実施例２と異ならせたこと以外においては、実施例２と同様にしてカバーガラスを作製した。具体的には、アンチグレア層の形成に際し、ガラス板を加熱し、表面温度を４８．２℃とした状態において、実施例２と同様の無機塗料をガラス板上に塗布した。ノズルのｘ方向の移動速度は６０ｍ／ｍｉｎとし、無機塗料の流量は４．８ｇ／ｍｉｎとし、ノズルのｙ方向の移動ピッチは１ｍｍとした。塗布時の湿度は５２．０％であり、気温は２０．０℃であった。アンチグレア層の平均厚みは１．１μｍとした。 (Comparative Example 2)
Examples except that the temperature of the glass plate when the inorganic paint was applied, the conditions for applying the inorganic paint by the spray coating method, and the humidity and temperature at the time of application were different from those of Example 2 when forming the anti-glare layer. A cover glass was produced in the same manner as in 2. Specifically, when forming the anti-glare layer, the glass plate was heated and the surface temperature was set to 48.2 ° C., and the same inorganic paint as in Example 2 was applied onto the glass plate. The moving speed of the nozzle in the x direction was 60 m / min, the flow rate of the inorganic paint was 4.8 g / min, and the moving pitch of the nozzle in the y direction was 1 mm. The humidity at the time of application was 52.0%, and the air temperature was 20.0 ° C. The average thickness of the anti-glare layer was 1.1 μm.
　（比較例３）
　アンチグレア層の形成に際し、無機塗料の塗布を１回とし、無機塗料の塗布の際のガラス板の温度を実施例２と異ならせた。上記に加え、スプレーコート法による無機塗料の塗布の条件並びに塗布時の湿度及び温度を実施例２と異ならせたこと以外においては、実施例２と同様にしてカバーガラスを作製した。具体的には、アンチグレア層の形成に際し、ガラス板を加熱し、表面温度を４８．２℃とした状態において、実施例２と同様の無機塗料をガラス板上に塗布した。ノズルのｘ方向の移動速度は４５ｍ／ｍｉｎとし、無機塗料の流量は４．８ｇ／ｍｉｎとし、ノズルのｙ方向の移動ピッチは１ｍｍとした。無機塗料の塗布時の湿度は５２．０％であり、温度は２０．０℃であった。 (Comparative Example 3)
When forming the anti-glare layer, the inorganic paint was applied once, and the temperature of the glass plate at the time of applying the inorganic paint was different from that of Example 2. In addition to the above, a cover glass was produced in the same manner as in Example 2 except that the conditions for applying the inorganic paint by the spray coating method and the humidity and temperature at the time of application were different from those in Example 2. Specifically, when forming the anti-glare layer, the glass plate was heated and the surface temperature was set to 48.2 ° C., and the same inorganic paint as in Example 2 was applied onto the glass plate. The moving speed of the nozzle in the x direction was 45 m / min, the flow rate of the inorganic paint was 4.8 g / min, and the moving pitch of the nozzle in the y direction was 1 mm. The humidity at the time of applying the inorganic paint was 52.0%, and the temperature was 20.0 ° C.
　（比較例４）
　アンチグレア層の形成に際し、無機塗料の塗布の際のガラス板の温度、及び無機塗料の塗布時の湿度を比較例３と異ならせたこと以外においては、比較例３と同様にしてカバーガラスを作製した。具体的には、アンチグレア層の形成に際し、ガラス板を加熱し、表面温度を４３．８℃とした。無機塗料の塗布時の湿度は５１．８％であった。 (Comparative Example 4)
A cover glass was produced in the same manner as in Comparative Example 3 except that the temperature of the glass plate when the inorganic paint was applied and the humidity when the inorganic paint was applied were different from those in Comparative Example 3 when forming the anti-glare layer. did. Specifically, when forming the anti-glare layer, the glass plate was heated to set the surface temperature to 43.8 ° C. The humidity at the time of applying the inorganic paint was 51.8%.
　（比較例５）
　フロスト処理における浸漬時間を実施例９と異ならせたこと以外においては、実施例９と同様にしてカバーガラスを作製した。具体的には、フロスト処理における浸漬時間を１８０秒間とした。 (Comparative Example 5)
A cover glass was produced in the same manner as in Example 9 except that the immersion time in the frost treatment was different from that in Example 9. Specifically, the immersion time in the frost treatment was set to 180 seconds.
　（比較例６）
　アンチグレア層の形成に際し、無機塗料の塗布の際のガラス板の温度、並びに無機塗料の塗布時の湿度及び温度を比較例３と異ならせたこと以外においては、比較例３と同様にしてカバーガラスを作製した。具体的には、アンチグレア層の形成に際し、ガラス板を加熱し、表面温度を４８．２℃とした。無機塗料の塗布時の湿度は４５．５％であり、温度は２１．１℃であった。 (Comparative Example 6)
When forming the anti-glare layer, the cover glass is the same as in Comparative Example 3 except that the temperature of the glass plate when the inorganic paint is applied and the humidity and temperature when the inorganic paint is applied are different from those of Comparative Example 3. Was produced. Specifically, when forming the anti-glare layer, the glass plate was heated to set the surface temperature to 48.2 ° C. The humidity at the time of applying the inorganic paint was 45.5%, and the temperature was 21.1 ° C.
　実施例１～８並びに比較例１～４及び６の条件を下記の表１にまとめて示す。なお、実施例９及び１０並びに比較例５の条件は、別途下記の表２に示す。 The conditions of Examples 1 to 8 and Comparative Examples 1 to 4 and 6 are summarized in Table 1 below. The conditions of Examples 9 and 10 and Comparative Example 5 are separately shown in Table 2 below.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　（評価）
　実施例１～１０及び比較例１～６のカバーガラスの像鮮明度ＤＯＩ、光沢度Ｇ、ヘイズＨ、ぎらつき指標値Ｓ及び映り込み指標値Ｃをそれぞれ測定した。像鮮明度ＤＯＩは、ＡＳＴＭ　Ｄ　５７６７に基づいて、ＳＭＳ－１０００（Ｄｉｓｐｌａｙ－Ｍｅｓｓｔｅｃｈｎｉｋ＆Ｓｙｓｔｅｍｅ社製）を用いて測定した。光沢度Ｇとしては、ＪＩＳ　Ｚ　８７４１：１９９７に基づいて、カバーガラスにおける入射角６０°の光沢度Ｇを、Ｍｉｃｒｏｇｌｏｓｓ（６０°）（ＢＹＫ製）を用いて測定した。ヘイズＨは、ＪＩＳ　Ｋ　７１３６：２０００に基づいて、ＮＤＨ－５０００（日本電色社製）を用いて測定した。ぎらつき指標値Ｓは、ＳＭＳ－１０００（Ｄｉｓｐｌａｙ－Ｍｅｓｓｔｅｃｈｎｉｋ＆Ｓｙｓｔｅｍｅ社製）を用いて、スパークル測定モードにより測定した。なお、ＳＭＳ－１０００のＣＣＤカメラの画素数は１２９６×９６６であり、センサーサイズは１／３型であり、ピクセルサイズは３．７５×３．７５μｍである。また、レンズの焦点距離を１００ｍｍ、レンズ絞り径を４．５ｍｍ、倍率比を１：１、許容錯乱円径を５３μｍに設定した。また、パターンマスクについては、レンズの焦点位置にトップ面が位置するように配置した。映り込み指標値Ｃは、ＳＭＳ－１０００（Ｄｉｓｐｌａｙ－Ｍｅｓｓｔｅｃｈｎｉｋ＆Ｓｙｓｔｅｍｅ社製）を用いて、反射分布測定モードにより測定した。なお、焦点距離１６ｍｍのレンズを用い、入射光の入射角を３°、実施例及び比較例のカバーガラス上の照射位置からレンズまでの距離を４１０ｍｍに設定し、実施例及び比較例のカバーガラスの裏面に屈折率１．５３の浸液を付けた状態で黒板ガラスと貼り付けて測定した。 (Evaluation)
The image sharpness DOI, glossiness G, haze H, glare index value S, and reflection index value C of the cover glasses of Examples 1 to 10 and Comparative Examples 1 to 6 were measured, respectively. Image sharpness DOI was measured using SMS-1000 (manufactured by Display-Mestechnik & System) based on ASTM D 5767. As the glossiness G, the glossiness G at an incident angle of 60 ° on the cover glass was measured using Microgloss (60 °) (manufactured by BYK) based on JIS Z 8741: 1997. Haze H was measured using NDH-5000 (manufactured by Nippon Denshoku Co., Ltd.) based on JIS K 7136: 2000. The glare index value S was measured in a sparkle measurement mode using SMS-1000 (manufactured by Display-Mestechnik & System). The number of pixels of the SMS-1000 CCD camera is 1296 × 966, the sensor size is 1/3 type, and the pixel size is 3.75 × 3.75 μm. Further, the focal length of the lens was set to 100 mm, the aperture diameter of the lens was set to 4.5 mm, the magnification ratio was set to 1: 1, and the permissible circle of confusion diameter was set to 53 μm. The pattern mask was arranged so that the top surface was located at the focal position of the lens. The reflection index value C was measured in a reflection distribution measurement mode using SMS-1000 (manufactured by Display-Mestechnik & System). Using a lens with a focal length of 16 mm, the incident angle of the incident light is set to 3 °, the distance from the irradiation position on the cover glass of the examples and the comparative examples to the lens is set to 410 mm, and the cover glasses of the examples and the comparative examples It was measured by sticking it on a blackboard glass with an immersion liquid having a refractive index of 1.53 on the back surface of the lens.
　さらに、測定した像鮮明度ＤＯＩ、光沢度Ｇ、ヘイズＨ、ぎらつき指標値Ｓ及び映り込み指標値Ｃから、式（１）により、実施例１～１０及び比較例１～６の視認性パラメータＰを算出した。 Further, from the measured image sharpness DOI, glossiness G, haze H, glare index value S, and reflection index value C, the visibility parameters of Examples 1 to 10 and Comparative Examples 1 to 6 are obtained according to the formula (1). P was calculated.
　Ｐ＝（１０００００×ＤＯＩ）／（Ｇ×Ｈ×Ｓ×Ｃ）…式（１） P = (100000 x DOI) / (G x H x S x C) ... Equation (1)
　これらの結果を下記の表３に示す。 These results are shown in Table 3 below.
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000003
　表３に示すように、実施例１～１０は、視認性パラメータＰが１５０以上、２０００以下の範囲内であることがわかる。特に、実施例１～６、８及び１０は、視認性パラメータＰが２００以上、２０００以下の範囲内であることがわかる。一方で、比較例１の視認性パラメータＰは、２０００よりも高く、比較例２～６は、１５０よりも低い。 As shown in Table 3, it can be seen that in Examples 1 to 10, the visibility parameter P is in the range of 150 or more and 2000 or less. In particular, in Examples 1 to 6, 8 and 10, it can be seen that the visibility parameter P is in the range of 200 or more and 2000 or less. On the other hand, the visibility parameter P of Comparative Example 1 is higher than 2000, and Comparative Examples 2 to 6 are lower than 150.
　さらに、照度１０００ｌｕｘにおいて、カバーガラスの表面を距離５０ｃｍ、角度５°から観察し、映り込み、ぎらつき及び解像度を評価した。これらの結果を下記の表４に示す。加えて、実施例１及び比較例２のカバーガラスの視認性を、太陽光の下で比較した。観察時における実施例１～４及び比較例１及び２のカバーガラスの写真を図２～図８に示す。 Furthermore, at an illuminance of 1000 lux, the surface of the cover glass was observed from a distance of 50 cm and an angle of 5 °, and reflection, glare and resolution were evaluated. These results are shown in Table 4 below. In addition, the visibility of the cover glasses of Example 1 and Comparative Example 2 was compared under sunlight. Photographs of the cover glasses of Examples 1 to 4 and Comparative Examples 1 and 2 at the time of observation are shown in FIGS. 2 to 8.
　図２は、比較例１のカバーガラスの写真である。図３は、比較例２のカバーガラスの写真である。図４は、実施例１のカバーガラスの写真である。図５は、実施例２のカバーガラスの写真である。図６は、実施例３のカバーガラスの写真である。図７は、実施例４のカバーガラスの写真である。図８は、太陽光の下における、実施例１及び比較例２のカバーガラスの写真である。 FIG. 2 is a photograph of the cover glass of Comparative Example 1. FIG. 3 is a photograph of the cover glass of Comparative Example 2. FIG. 4 is a photograph of the cover glass of Example 1. FIG. 5 is a photograph of the cover glass of Example 2. FIG. 6 is a photograph of the cover glass of Example 3. FIG. 7 is a photograph of the cover glass of Example 4. FIG. 8 is a photograph of the cover glass of Example 1 and Comparative Example 2 under sunlight.
Figure JPOXMLDOC01-appb-T000004
Figure JPOXMLDOC01-appb-T000004
　表４に示すように、比較例１では映り込みにより視認性が低く、比較例２では解像度により視認性が低い。なお、図２に示すように、比較例１においては、照明の映り込みの度合いが大きいことがわかる。図３に示すように、比較例２においては、文字が不鮮明となっていることがわかる。さらに、表４に示すように、比較例３、４及び６においては解像度において視認性が低く、比較例５においては、ぎらつきにおいて視認性が低い。 As shown in Table 4, in Comparative Example 1, the visibility is low due to reflection, and in Comparative Example 2, the visibility is low due to the resolution. As shown in FIG. 2, it can be seen that in Comparative Example 1, the degree of reflection of the illumination is large. As shown in FIG. 3, it can be seen that the characters are unclear in Comparative Example 2. Further, as shown in Table 4, in Comparative Examples 3, 4 and 6, the visibility is low in resolution, and in Comparative Example 5, the visibility is low in glare.
　これらに対して、表４に示すように、実施例１～４においては、映り込み、ぎらつき及び解像度はいずれも良好であることがわかる。なお、図４～図７に示すように、実施例１～４においては、映り込みの度合いは大きくなく、文字は鮮明であり、ぎらつきも目立たない。さらに、図８に示すように、太陽光の下では、比較例２においては文字がほぼ見えず、視認性が低いことに対し、実施例１においては文字が明瞭に見え、視認性が高い。以上のように、実施例１～４においては、視認性が高いことがわかる。同様に、表４に示すように、実施例５～１０においても、映り込み、ぎらつき及び解像度はいずれも良好であり、視認性が高いことがわかる。 On the other hand, as shown in Table 4, it can be seen that in Examples 1 to 4, the reflection, glare, and resolution are all good. As shown in FIGS. 4 to 7, in Examples 1 to 4, the degree of reflection is not large, the characters are clear, and the glare is not noticeable. Further, as shown in FIG. 8, under sunlight, the characters are almost invisible in Comparative Example 2 and the visibility is low, whereas in the first embodiment, the characters are clearly visible and the visibility is high. As described above, it can be seen that the visibility is high in Examples 1 to 4. Similarly, as shown in Table 4, it can be seen that in Examples 5 to 10, the reflection, glare, and resolution are all good, and the visibility is high.
１…カバーガラス
２…ガラス板
３…アンチグレア層
４…反射防止膜
５…防汚層 1 ... Cover glass 2 ... Glass plate 3 ... Anti-glare layer 4 ... Anti-reflection film 5 ... Antifouling layer

Claims (3)

  1. 　ガラス板と、
    　前記ガラス板上に設けられているアンチグレア層と、
    　前記アンチグレア層上に設けられている反射防止膜と、
    を備え、
    　像鮮明度をＤＯＩ、光沢度をＧ、ヘイズをＨ、ぎらつき指標値をＳ、映り込み指標値をＣとしたときに、下記の式（１）における視認性パラメータＰが、１５０以上、２０００以下である、カバーガラス。
    　Ｐ＝（１０００００×ＤＯＩ）／（Ｇ×Ｈ×Ｓ×Ｃ）…式（１）     With a glass plate
    The anti-glare layer provided on the glass plate and
    An antireflection film provided on the anti-glare layer and
    With
    When the image sharpness is DOI, the glossiness is G, the haze is H, the glare index value is S, and the reflection index value is C, the visibility parameter P in the following equation (1) is 150 or more and 2000. The cover glass below.
    P = (100000 × DOI) / (G × H × S × C)… Equation (1)
  2. 　前記反射防止膜上に設けられている防汚層をさらに備える、請求項１に記載のカバーガラス。 The cover glass according to claim 1, further comprising an antifouling layer provided on the antireflection film.
  3. 　請求項１または２に記載のカバーガラスを備える、デジタルサイネージ。 Digital signage with the cover glass according to claim 1 or 2.
PCT/JP2020/016268 2019-04-25 2020-04-13 Cover glass and digital signage WO2020218056A1 (en)

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