WO2013088910A1 - Verre de protection et son procédé de fabrication - Google Patents

Verre de protection et son procédé de fabrication Download PDF

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Publication number
WO2013088910A1
WO2013088910A1 PCT/JP2012/079908 JP2012079908W WO2013088910A1 WO 2013088910 A1 WO2013088910 A1 WO 2013088910A1 JP 2012079908 W JP2012079908 W JP 2012079908W WO 2013088910 A1 WO2013088910 A1 WO 2013088910A1
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WIPO (PCT)
Prior art keywords
region
forming member
stress layer
compressive stress
glass
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PCT/JP2012/079908
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English (en)
Japanese (ja)
Inventor
将也 木下
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コニカミノルタ株式会社
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Application filed by コニカミノルタ株式会社 filed Critical コニカミノルタ株式会社
Priority to JP2013549178A priority Critical patent/JP5962667B2/ja
Publication of WO2013088910A1 publication Critical patent/WO2013088910A1/fr

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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
    • C03C21/00—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface

Definitions

  • the present invention relates to a cover glass having a curved portion and a method for manufacturing the same.
  • Patent Document 1 As disclosed in JP-A-2004-339019 (Patent Document 1) and JP-A-2008-247732 (Patent Document 2), by forming a compressive stress layer on the surface of the glass using an ion exchange method. A technique for improving the strength (surface stress value) of the surface of glass is known.
  • Electronic devices such as mobile phones or tablet PCs (Personal computers) have a display having an image display unit.
  • the glass plate whose surface is chemically strengthened by the formation of the compressive stress layer is provided as a cover glass (cover glass for display) so as to cover the image display portion of the display.
  • cover glass incorporated in an electronic device (display device) such as a mobile phone
  • a thin glass is required, but a cover glass having higher strength is required so that it can withstand an impact caused by dropping.
  • the cover glass chemically strengthened by the formation of the compressive stress layer is not limited to use as a display cover glass for protecting the image display unit, but is used as a member (so-called exterior cover) constituting the casing of the electronic device.
  • a display cover glass for protecting the image display unit but is used as a member (so-called exterior cover) constituting the casing of the electronic device.
  • cover glass is used as an exterior cover, a higher strength is required for the cover glass. ing.
  • a cover glass having a curved portion is incorporated in an electronic device (display device) such as a mobile phone.
  • an electronic device such as a mobile phone.
  • the cover glass is removed from the user. Subject to pressing force or impact force from falling. Under the present circumstances, the stress with respect to a cover glass acts also as a bending stress directly or indirectly also on the part formed in the curved surface shape.
  • a compressive stress layer having a predetermined depth is formed on the surface of the glass when the cover glass is manufactured.
  • the cover glass thus obtained is chemically strengthened mainly on the display surface or the exterior main surface (parts constituting the main part of the exterior cover), and the display surface or exterior main surface is added from the outside. It has high strength (rigidity) against the stress applied.
  • the cover glass obtained in this way is designed so that the strength of the part such as the display surface or the exterior main surface becomes an optimum value, but the curved inner region of the curved portion is formed. Is less likely to form a compressive stress layer compared to a part such as a display surface or an exterior main surface, and the thickness of the compressive stress layer formed in the inner region of the curve is not sufficient (in other words, Then, the inner area of the curved portion of the curved portion is likely to be insufficient in strength compared to a portion such as a display surface or an exterior main surface).
  • Chemically strengthened glass can maintain a predetermined strength against scratches at a certain depth, but the strength becomes extremely weak when scratches exceeding a certain depth are formed.
  • a part such as the display surface or the exterior main surface is subjected to stress due to pressing or stress due to dropping, these stresses also act on the inner region of the curved portion of the curved surface. If a small scratch existing in the inner region of the curve grows due to the stress concentration and the depth of the scratch exceeds a certain value, a crack or the like occurs in the inner region of the curve.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cover glass capable of maintaining a predetermined strength even for a curved portion, and a method for manufacturing the same. To do.
  • the cover glass according to the present invention includes a glass forming member in which a chemical strengthening by ion exchange is performed and a compressive stress layer is formed on each of the front surface side and the back surface side.
  • the glass forming member includes a central region and the central region.
  • a concave region that is connected to the outer edge of the side region and is curved in a direction away from the surface as it goes outward from the central region, and is located inside the curved region In the region, the compressive stress layer is formed so that the ion exchange proceeding toward the inside of the glass forming member is promoted as compared with other regions of the concave side region, and the glass forming member
  • the compressive stress layer formed in (1) is formed so as to have substantially the same compressive stress layer depth on both the front surface side and the back surface side.
  • the compressive stress layer formed on the glass forming member has a depth of the compressive stress layer when the surface stress value of the compressive stress layer substantially peaks on both the front surface side and the back surface side. Is formed.
  • the concave region where the formation of the compressive stress layer is promoted is a region having an approximate R of 2.5 mm or less inside the curvature of the curved region.
  • the compressive stress layer formed on the glass forming member is formed to have a thickness of 20 ⁇ m or more and 100 ⁇ m or less over the entire surface of the glass forming member.
  • the cover glass is formed so that the plate thickness is in the range of 0.4 mm to 3.0 mm over the entire surface.
  • the method for manufacturing a cover glass according to the present invention is a method for manufacturing a cover glass in which a compressive stress layer is formed on each of the front surface side and the back surface side.
  • the cover glass is connected to the center side region and the outer edge of the center side region.
  • the chemical strengthening is performed in such a manner as to be promoted as compared with the above.
  • the step of forming the compressive stress layer includes a step of preparing a storage tank in which the first partition region and the second partition region are provided by storing the chemically strengthened salt therein and partitioning the inside thereof. And the glass forming member such that the concave region of the glass forming member is exposed inside the first partition region and the other region of the glass forming member is exposed inside the second partition region.
  • the chemically strengthened salt and by stirring the chemically strengthened salt inside the first partition region the ion exchange is performed in the concave region of the glass forming member compared to the other regions. Forming the compressive stress layer so as to be promoted.
  • the step of forming the compressive stress layer includes a step of preparing a storage tank in which the first partition region and the second partition region are provided by storing the chemically strengthened salt therein and partitioning the inside thereof. And the glass forming member such that the concave region of the glass forming member is exposed inside the first partition region and the other region of the glass forming member is exposed inside the second partition region. And setting the temperature of the chemical strengthening salt inside the first partition region to a value higher than the temperature of the chemical strengthening salt inside the second partition region. And forming the compressive stress layer in the concave region of the glass forming member so that the ion exchange is promoted as compared with the other regions.
  • the step of forming the compressive stress layer includes a step of preparing a storage tank in which a chemically strengthened salt is stored, and a step of immersing the glass forming member in the storage tank. Forming the compressive stress layer on the front surface side and the back surface side, performing a masking process on the other region of the glass forming member, and immersing the glass forming member in the storage tank. And further forming the compressive stress layer in the concave region of the glass forming member so as to promote the ion exchange as compared with the other regions.
  • the chemical strengthening is performed so that the depth of the compressive stress layer in the concave region is substantially the same as the depth of the compressive stress layer in the central region.
  • FIG. 2 is a cross-sectional view taken along the line II-II in FIG. It is sectional drawing which shows the assembled state of the display apparatus provided with the cover glass in embodiment. It is sectional drawing which expands and shows the area
  • FIG. 1 is a perspective view showing a disassembled state of a display device 100 including a cover glass 10 in the present embodiment.
  • 2 is a cross-sectional view taken along the line II-II in FIG.
  • FIG. 3 is a cross-sectional view illustrating the assembled state of the display apparatus 100.
  • FIG. 4 is an enlarged cross-sectional view showing a region surrounded by line IV in FIG.
  • the display device 100 includes a cover glass 10, a plate-shaped exterior plate 20, a circuit board 30 disposed on the exterior plate 20, a display 40 mounted on the circuit board 30, And a speaker 50 mounted on the circuit board 30.
  • the cover glass 10 in the present embodiment functions as a so-called display cover glass.
  • the cover glass 10 is attached to the exterior plate 20 as indicated by an arrow AR, thereby sealing the circuit board 30, the display 40, and the speaker 50 on the exterior plate 20.
  • the cover glass 10 includes a glass forming member 10 ⁇ / b> G provided so as to cover the image display unit 42 of the display 40, and an opening 10 ⁇ / b> H provided so as to correspond to the speaker 50.
  • the opening 10H is formed so as to penetrate the glass forming member 10G from the front surface 11 (see FIG. 2) side toward the back surface 12 (see FIG. 2) side.
  • the glass forming member 10G As shown in FIGS. 1 and 2, the glass forming member 10 ⁇ / b> G of the cover glass 10 has a central side region 13 (see FIG. 2) formed in a substantially flat plate shape and a curved surface provided continuously to the outer edge of the central side region 13. It has the area
  • FIG. 2 the glass forming member 10 ⁇ / b> G of the cover glass 10 has a central side region 13 (see FIG. 2) formed in a substantially flat plate shape and a curved surface provided continuously to the outer edge of the central side region 13. It has the area
  • the outer edge of the central region 13 in the present embodiment is formed in a substantially rectangular shape with four rounded corners.
  • the dimension L1 (see FIG. 1) of the two opposite sides (long sides) of the central region 13 is 80 mm or more and 250 mm or less, and the dimension L2 of the other two sides (short sides) of the central region 13 facing each other. Is from 50 mm to 200 mm.
  • the curved surface region 14 is curved so as to move away from the surface 11 of the central region 13 as it goes outward from the central region 13.
  • the side region 15 is located further outside the curved surface region 14, and is formed in an annular shape as a whole.
  • the thickness T of the central region 13, the thickness T14 of the curved region 14 (the thickness in the normal direction with respect to the surface of the curved region 14), and The thickness T15 of the side region 15 is configured to be substantially the same value.
  • cover glass 10 glass forming member 10G
  • exterior plate 20 display 40
  • cover glass 10 glass forming member 10G
  • surface 11 of the cover glass 10 hereinafter referred to as an exposed surface.
  • Side is exposed to the outside.
  • the light L (see FIG. 2) from the back surface 12 (hereinafter also referred to as a non-exposed surface) located on the image display unit 42 side of the glass forming member 10G toward the front surface 11 side is a central region of the glass forming member 10G.
  • various kinds of image information displayed on the image display unit 42 are recognized by the user.
  • the surface 11 of the central region 13 constitutes a touch panel display surface
  • the surface 11 of the central region 13 is pressed by a user's finger 90 (see FIG. 3), or the surface 11 of the central region 13 is a pen. (Not shown) or the like.
  • Front side compressive stress layer 17 and back side compressive stress layer 19 Referring to FIG. 4, in order to improve the strength of cover glass 10 (glass forming member 10G), center side region 13, curved surface region 14, and side region 15 are entirely formed on the surface 11 side of glass forming member 10G.
  • the surface side compressive stress layer 17 is formed over.
  • the surface side compressive stress layer 17 is formed by ion exchange of alkali metal ions contained in the vicinity of the surface 11 of the glass forming member 10G to a chemically strengthened salt having an ionic radius larger than the ionic radius.
  • the rear surface side compression is performed on the back surface 12 side of the glass forming member 10G over the entire center region 13, curved surface region 14, and side region 15.
  • a stress layer 19 is formed.
  • the back surface side compressive stress layer 19 is also formed by ion exchange of alkali metal ions contained in the vicinity of the back surface 12 of the glass forming member 10G to a chemically strengthened salt having an ion radius larger than the ion radius.
  • the strength of the glass surface also increases.
  • the strength (surface stress value) of the glass surface becomes maximum.
  • the strength at the surface of the glass starts to decrease, with the value at the time when it reaches the maximum as a peak.
  • Each compressive stress layer 17, 19 formed on the glass forming member 10 ⁇ / b> G of the present embodiment has a central region 13, a curved region 14, and a side region 15 on both the front surface 11 side and the back surface 12 side.
  • the compressive stress layers are formed so that the depths thereof are substantially the same value.
  • “the depths of the compressive stress layers in the central region 13, the curved region 14, and the side region 15 are substantially the same value” means that the central region 13, the curved region 14, and the side region 15 This means that the depth of each compressive stress layer is within a range of ⁇ 5 ⁇ m with respect to the average value of the depth of each compressive stress layer in the central region 13, the curved region 14, and the side region 15. To do.
  • the surface side compressive stress layer 17 formed on the glass forming member 10G of the present embodiment has a glass forming member 10G on the surface 11 side in each of the central region 13, the curved region 14, and the side region 15. It is formed so as to be the depth of the compressive stress layer when the surface stress value of this becomes a substantially peak.
  • the back surface side compressive stress layer 19 similarly on the back surface 12 side, has a surface stress value of the glass forming member 10G on the back surface 12 side in each of the central region 13, the curved region 14, and the side region 15. It is formed so as to be the depth of the compressive stress layer when it becomes a substantially peak.
  • FIG. 5 is a cross-sectional view showing a state of the cover glass 10 (glass forming member 10G) in the present embodiment before chemical strengthening treatment.
  • the surface side compressive stress layer 17 is formed on the glass forming member 10G before the chemical strengthening treatment
  • the surface side compressive stress layer 17 is formed to the depth of the virtual curve L16 indicated by the dotted line in FIG.
  • the strength (surface stress value) of the surface 11 of the glass forming member 10G is maximized.
  • the back surface side compressive stress layer 19 is formed on the glass forming member 10G before the chemical strengthening treatment also on the back surface 12 side, the back surface side compressive stress is reduced to the depth of the virtual curve L18 indicated by the dotted line in FIG.
  • the strength (surface stress value) of the back surface 12 of the glass forming member 10G is maximized.
  • the depth of each of the virtual curve L16 and the virtual curve L18 varies depending on the composition of the glass used to create the glass forming member 10G.
  • the strength of the surface 11 of the center side region 13 (surface stress value). ) Is the maximum.
  • the surface side compressive stress layer 17 having the same depth as the depth T2 of the virtual curve L16 in the curved surface region 14 is formed in the curved surface region 14, so that the strength (surface stress value) of the surface 11 of the curved surface region 14 is maximized. It becomes.
  • the back surface side compressive stress layer 19 When the back surface side compressive stress layer 19 is formed, ion exchange is gradually performed from the back surface 12 (non-exposed surface) side in each of the central region 13, the curved region 14, and the side region 15.
  • the back side compressive stress layer 19 is gradually formed from the side toward the inside of the glass forming member 10G (see arrow AR19).
  • the strength (surface stress value) of the back surface 12 of the center side region 13 is formed. ) Is the maximum.
  • the strength (surface stress value) of the back surface 12 of the curved region 14 is maximized. It becomes.
  • the depth T1, T2, T3 on the front surface 11 side and the depth T1, T2, T3 on the back surface 12 side are the same value, depending on the composition of the glass used for manufacturing the glass forming member 10G There may be different values.
  • the values of the depths T1, T2, and T3 themselves may be the same or different.
  • FIG. 6 shows the relationship between the depth of the compressive stress layer formed on the surface of the glass material of the glass forming member 10G used for manufacturing the cover glass 10 in the present embodiment and the strength (surface stress value) of the surface.
  • the glass forming member 10G used for manufacturing the cover glass 10 of the present embodiment has a center when each value of the depth T1, T2, T3 of the surface side compressive stress layer 17 is 40 ⁇ m.
  • the strength (surface stress value) at the surface 11 of each of the side region 13, the curved region 14, and the side region 15 is maximized.
  • the glass forming member 10G used for manufacturing the cover glass 10 of the present embodiment has a depth T1, T2, T3 of the back surface side compression stress layer 19 of 40 ⁇ m.
  • the strength (surface stress value) on the back surface 12 of each of the central side region 13, the curved surface region 14, and the side region 15 is maximized.
  • Each value of the depth of the compressive stress layer shown on the horizontal axis in FIG. 6 is measured using a polarimeter SF-IIC manufactured by Shinko Seiki Co., Ltd.
  • Each value of the surface stress value shown on the vertical axis in FIG. 6 is measured using a glass surface stress meter SURFACE STRESS METER “FSM-6000LE” manufactured by Orihara Seisakusho.
  • each of the compressive stress layers 17 and 19 formed on the glass forming member 10G has substantially the same compressive stress layer depth on both the front surface 11 side and the back surface 12 side. It is formed to become.
  • the surface side compressive stress layer 17 formed on the glass forming member 10G of the present embodiment has a glass forming member 10G on the surface 11 side in each of the central region 13, the curved region 14, and the side region 15. It is formed so as to be the depth of the compressive stress layer when the surface stress value of this becomes a substantially peak.
  • the surface side compressive stress layer 17 of the glass forming member 10G is formed such that the formation depth thereof follows the virtual curve L16 (see FIG. 5).
  • the back surface side compressive stress layer 19 has a surface stress value of the glass forming member 10G on the back surface 12 side in each of the central region 13, the curved region 14, and the side region 15. It is formed so as to be the depth of the compressive stress layer when it becomes a substantially peak.
  • the back surface side compression stress layer 19 of the glass forming member 10G is formed so that the formation depth thereof follows the virtual curve L18 (see FIG. 5).
  • the depth of the compressive stress layer when the surface stress value substantially reaches the peak is within the range of ⁇ 5 ⁇ m (the depth of the compressive stress layer when the surface stress value actually peaks). Means value.
  • the glass forming member 10 ⁇ / b> G has the curved surface region 14.
  • a concave region RR is formed on the inner side (back surface 12) of the curved surface region 14.
  • the amount of chemical strengthening salt supplied to the concave region RR is smaller than the amount of chemical strengthening salt supplied to regions other than the concave region RR.
  • chemical strengthening is difficult to be performed in the concave side region RR.
  • ion diffusion amount Q1 in the ion exchange is expressed by the following equation (1) .
  • Q1 2 ⁇ C 0 ⁇ ⁇ (D ⁇ t / ⁇ ) (1) That is, the ion diffusion amount Q at a certain time is a constant value per unit area of the surface.
  • a necessary ion diffusion amount Q2 is expressed by the following equation (2).
  • the back surface is configured so that ion exchange that proceeds toward the inside of the glass forming member 10G is promoted as compared with other regions of the concave side region RR.
  • a side compressive stress layer 19 is formed.
  • the back side compression stress layer 19 is formed in the concave side region RR so that ion exchange proceeding toward the inside of the glass forming member 10G is promoted as compared with other regions of the concave side region RR.
  • the compressive stress layers 17 and 19 formed on the glass forming member 10G are formed to have substantially the same compressive stress layer depth on both the front surface 11 side and the back surface 12 side, and the entire cover glass 10 is formed. As a result, the strength can be improved.
  • the thickness (formation depth T1, T2, T3) of the front surface side compressive stress layer 17 and the back surface side compressive stress layer 19 formed on the glass forming member 10G is 20 ⁇ m or more over the entire surface of the glass forming member 10G. It is good to form so that it may become 100 micrometers or less. The strength of the cover glass 10 as a whole can be further improved.
  • the display device 100 falls, the surface 11 of the glass forming member 10G is pressed by the user's finger 90, or the surface 11 is pressed by a pen or the like.
  • the stress directly acts on the central side region 13 (display surface), but also the bending stress indirectly acts on the curved surface region 14 formed in a curved surface shape.
  • the compressive stress layers 17 and 19 formed on the glass forming member 10G are formed so as to have substantially the same compressive stress layer depth on both the front surface 11 side and the back surface 12 side.
  • the compressive stress layer is formed so as to have a depth when the surface stress value of the compressive stress layer substantially reaches a peak).
  • the compressive stress layers 17 and 19 having substantially the same depth as the compressive stress layers 17 and 19 formed in the central region 13 are also formed in the curved region 14, so that the display device 100 can be dropped. Even if the stress is concentrated on the curved surface region 14 by repeatedly pressing the touch panel type central region 13 (display surface) by the user, the cover glass 10 is sufficiently chemically strengthened over the entire surface 11 and the back surface 12. Therefore, the occurrence of cracks or the like in the central side region 13, the curved surface region 14, or the side region 15 is effectively suppressed.
  • the cover glass 10 of the present embodiment not only the center side region 13 as the display surface but also the curved surface region 14 (particularly the concave side region RR) formed in a curved surface is maintained at a predetermined strength. Is possible.
  • the cover glass 10 of the present embodiment In the cover glass 10 of the present embodiment, the ion exchange that proceeds toward the inside of the glass forming member 10G is promoted compared to the other regions of the concave region RR so that the concave region RR has a back surface side.
  • the compressive stress layer 19 is formed, and the compressive stress layers 17 and 19 formed on the glass forming member 10G are formed to have substantially the same compressive stress layer depth on both the front surface 11 side and the back surface 12 side. .
  • a glass forming member 10 ⁇ / b> G that is a material (base material) of the cover glass 10 is prepared.
  • An example of the material of the glass forming member 10G is soda glass.
  • the glass forming member 10G may be formed by cutting out from the glass plate material, or a glass gob is formed from the glass plate material, and the glass gob is remelted on a mold. It may be formed by a so-called reheat press method in which press processing is performed after the molten glass is dropped, or may be formed by a so-called direct press method in which the molten glass is pressed by the lower die and the upper die after dropping the molten glass on the lower die. .
  • the thickness T (see FIG. 2) of the central region 13 is 0.5 mm
  • the dimension L1 (see FIG. 1) of the central region 13 and Each dimension L2 (see FIG. 1) is 110 mm ⁇ 60 mm.
  • the approximate R on the back surface 12 side (concave side region RR) of the curved surface region 14 is 1.0 mm.
  • the thickness T15 of the side region 15 is 1.6 mm.
  • a storage tank 64 in which the chemically strengthened salt 66 is stored is prepared.
  • the storage tank 64 stores a chemically strengthened salt 66 such as potassium nitrate (purity 98%), and the dimension of the inner wall storing the chemical strengthened salt 66 of the storage tank 64 is, for example, 300 mm ⁇ 300 mm ⁇ 300 mm.
  • the temperature of the chemically strengthened salt 66 is set to about 400 ° C. using a heating device (not shown) disposed around the storage tank 64.
  • the glass forming member 10G is immersed in the chemically strengthened salt 66 (see arrow DR1). After the elapse of a predetermined immersion time, a compressive stress layer is formed on the entire surface 11 and back surface 12 of the glass forming member 10G.
  • FIG. 8 shows the dipping time of the glass forming member 10G in the (first) dipping process of the manufacturing method of the cover glass 10 in the present embodiment, and the formation depth of the compressive stress layer formed on the surface of the glass forming member 10G. It is a figure which shows the relationship.
  • a compressive stress layer having a depth of about 40 ⁇ m is formed in the central region 13, and the surface stress value of the central region 13 has a peak. (About 600 MPa: see FIG. 6).
  • a compressive stress layer having a depth of about 26 ⁇ m is formed in the curved region 14 (concave region RR) even after the elapse of about 3.7 hours.
  • the surface stress value of the curved surface region 14 (concave region RR) is about 400 MPa (see FIG. 6) and does not reach the peak (about 600 MPa).
  • the masking member 73 is used to mask the portion other than the concave side region RR of the glass forming member 10G. To do. Thereafter, the glass forming member 10G is further immersed in the chemically strengthened salt 66 for 2 hours, for example.
  • the ion exchange is further performed in concave side region RR of curved surface region 14, so that a back surface having a peak depth in concave side region RR of glass forming member 10 ⁇ / b> G.
  • the side compressive stress layer 19 can be formed.
  • the cover glass 10 in the present embodiment can be obtained.
  • the interior of the storage tank 64 is partitioned into a first partition region R ⁇ b> 1 and a second partition region R ⁇ b> 2 using a plurality of partition plates 60. It may be configured.
  • the partition plate 60 forms a space where the chemically strengthened salt 66 of the storage tank 64 is stored in the first partition region R1 and the second partition region R2. Partition.
  • the concave region RR of the glass forming member 10G is exposed inside the chemically strengthened salt 66 stored in the first partition region R1, and the glass forming member is stored inside the chemically strengthened salt 66 stored in the second partition region R2.
  • the 10G central region 13 and the like are exposed.
  • a heating device (not shown) arranged around the storage tank 64, the temperature of the chemically strengthened salt 66 stored in the first partition region R1 and the chemical strengthening salt 66 stored in the second partition region R2 are stored. Both temperatures are set to about 400 ° C.
  • the chemically strengthened salt 66 stored in the first partition region R1 is caused to flow by rotating a stirring rod (not shown) at a rotation speed of about 20 rpm (see arrow DR2).
  • a stirring rod not shown
  • ion exchange that proceeds toward the inside of the concave side region RR of the glass forming member 10G is performed on the concave side region.
  • the concave region RR is promoted more than the other regions of RR.
  • the chemically strengthened salt 66 is positively supplied to the concave region RR of the glass forming member 10G.
  • By positively performing ion exchange in the concave region RR it is possible to form the back surface side compressive stress layer 19 having a peak depth in the concave region RR of the glass forming member 10G.
  • thermocouple 71 is provided in the first partition region R1
  • a second thermocouple 72 is provided in the second partition region R2.
  • a heating device (not shown) for heating the chemically strengthened salt 66 inside the first partitioned region R1
  • a heating device (not shown) for heating the chemically strengthened salt 66 inside the second partitioned region R2. are configured to be controllable independently of each other.
  • the temperature of the chemical strengthening salt 66 in the first partition region R1 is set higher than the temperature of the chemical strengthening salt 66 in the second partition region R2.
  • FIG. 13 four types of cover glasses 10 of Comparative Example 1 and Examples 1 to 3 were manufactured using the method of manufacturing cover glass 10 based on the above-described embodiment.
  • the shape of the glass forming member 10G used in Comparative Example 1 and Examples 1 to 3 is the same as that in the above-described embodiment, and the thickness T (see FIG. 2) of the central region 13 is 0.5 mm.
  • the dimension L1 (see FIG. 1) and the dimension L2 (see FIG. 1) of the central region 13 are each 110 mm ⁇ 60 mm.
  • the approximate R on the back surface 12 side (concave side region RR) of the curved surface region 14 is 1.0 mm.
  • the thickness T15 of the side region 15 is 1.6 mm.
  • Comparative Example 1 As Comparative Example 1, the glass forming member 10G prepared as described above was immersed in the storage tank 64 in which the chemically strengthened salt 66 was stored. The immersion was performed only once, and the cover glass 10 was immersed for 3.7 hours without performing the masking process.
  • Example 1 As Example 1, the glass forming member 10G prepared as described above was immersed in the storage tank 64 in which the chemically strengthened salt 66 was stored. At the time of the first immersion, the glass forming member 10G was immersed for 3.7 hours without performing the masking process. Thereafter, during the second immersion, the cover glass 10 was further immersed for 1.3 hours in a state where masking was performed on the central region 13 and masking treatment was not performed on the concave region RR.
  • Example 2 As Example 2, the glass forming member 10G prepared as described above was immersed in the storage tank 64 in which the chemically strengthened salt 66 was stored. At the time of the first immersion, the glass forming member 10G was immersed for 3.7 hours without performing the masking process. Thereafter, during the second immersion, the cover glass 10 was further immersed for 2.3 hours in a state where masking was performed on the central region 13 and masking treatment was not performed on the concave region RR.
  • Example 3 As Example 3, the glass forming member 10G prepared as described above was immersed in the storage tank 64 in which the chemically strengthened salt 66 was stored. At the time of the first immersion, the glass forming member 10G was immersed for 3.7 hours without performing the masking process. Thereafter, during the second immersion, the cover glass 10 was further immersed for 3.3 hours in a state where masking was performed on the central region 13 and masking treatment was not performed on the concave region RR.
  • a compressive stress layer having 40 ⁇ m is formed in central side region 13, and 26 ⁇ m is formed in curved surface region 14 (concave side region RR).
  • a compressive stress layer was formed.
  • the formation depth of the compressive stress layer was measured using a polarimeter SF-IIC manufactured by Shinko Seiki Co., Ltd. (the same applies to Examples 1 to 3 below).
  • a three-point bending strength measurement test was performed on cover glass 10 obtained by the manufacturing method based on Comparative Example 1. Specifically, the support members 82 and 82 were disposed so as to face each other with a gap in the long side direction (DR10) of the cover glass 10, and the cover glass 10 was placed on the surface thereof in a bridging manner. In a state where the cover glass 10 is placed on the support member 82, the support member 82 is located at a position displaced inward from the end portion of the cover glass 10 by a dimension W ⁇ b> 1 (here, 5 mm).
  • the length of the support member 82 is about 50 mm, the tip of the support member 82 is formed in a spherical shape only along the long side direction, and the radius of curvature R82 is 3.2 mm.
  • the length of the pressing member 80 is about 50 mm, the tip of the pressing member 80 is formed in a spherical shape only along the long side direction, and its radius of curvature R80 is 3.2 mm.
  • ⁇ b3 (3PL) / (2 wt 2 )
  • P the maximum load (N) (load at break)
  • L the distance between the support members 82, 82
  • w the width of the cover glass 10
  • t the thickness of the cover glass 10.
  • the cover glass 10 obtained by the manufacturing method based on Comparative Example 1 As an evaluation value sigma b3 of 3-point bending strength, the result of 280MPa was obtained.
  • the compression stress layer having 40 ⁇ m is formed in the central region 13 and the compression having 35 ⁇ m in the curved region 14 (concave region RR). A stress layer was formed.
  • the cover glass 10 obtained by the manufacturing method based on Example 1 gave a result of 430 MPa as the three-point bending strength evaluation value ⁇ b3 .
  • a compressive stress layer having 40 ⁇ m is formed in the central region 13, and a compressive stress layer having 40 ⁇ m is formed in the curved region 14 (concave region RR). It was.
  • the cover glass 10 obtained by the manufacturing method based on Example 2 gave a result of 470 MPa as the three-point bending strength evaluation value ⁇ b3 .
  • a compressive stress layer having 40 ⁇ m is formed in the central region 13 and a compressive stress layer having 45 ⁇ m is formed in the curved region 14 (concave region RR). It was.
  • the cover glass 10 obtained by the manufacturing method based on Example 3 gave a result of 440 MPa as the three-point bending strength evaluation value ⁇ b3 .
  • the compressive stress layers 17 and 19 formed on the glass forming member 10G have a surface stress value of the compressive stress layer on both the front surface 11 side and the back surface 12 side. obtained but by being formed to have a depth of compression stress layer at the time of a substantially peak (depth 40 [mu] m ⁇ 5 [mu] m to form a peak value), a high value as an evaluation value sigma b3 of 3-point bending strength I understand that

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Surface Treatment Of Glass (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

L'invention concerne un verre de protection muni d'un élément de formation de verre (10G) dans lequel des couches à contrainte de compression (17, 19) sont formées respectivement sur un côté de surface avant (11) et un côté de surface arrière (12). L'élément de formation de verre (10G) comprend une région de côté central (13) et une région de surface recourbée (14) qui se recourbe à distance de la surface avant (11) dans une direction vers l'extérieur à partir de la région du côté central (13). Une région concave (RR) positionnée sur l'intérieur de la courbure de la région à surface recourbée (14) comprend la couche à contrainte de suppression (19) formée dans celle-ci d'une manière telle qu'un échange d'ions est stimulé dans la région concave (RR) en comparaison avec d'autres régions. Les couches à contrainte de compression (17, 19) sont formées d'une manière telle que les profondeurs des couches à contrainte de compression sur à la fois le côté de surface avant (11) et le côté de surface arrière (12) sont sensiblement identiques.
PCT/JP2012/079908 2011-12-14 2012-11-19 Verre de protection et son procédé de fabrication WO2013088910A1 (fr)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013125118A (ja) * 2011-12-14 2013-06-24 Konica Minolta Advanced Layers Inc ディスプレイ用カバーガラス
JP2015151329A (ja) * 2014-02-19 2015-08-24 日本電気硝子株式会社 強化ガラスの製造方法及び強化ガラス
US11203550B2 (en) 2018-04-27 2021-12-21 AGC Inc. Chemically strengthened glass plate, portable information terminal, and manufacturing method of chemically strengthened glass plate
US11565969B2 (en) 2016-05-19 2023-01-31 Apple Inc. Asymmetric chemical strengthening
US11639307B2 (en) 2018-07-13 2023-05-02 Apple Inc. Patterned asymmetric chemical strengthening
US11905205B2 (en) 2018-12-20 2024-02-20 Apple Inc. Strengthened covers for electronic devices

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106211667B (zh) * 2016-08-03 2022-02-22 安徽精卓光显技术有限责任公司 玻璃外壳及具有该玻璃外壳的电子产品

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Publication number Priority date Publication date Assignee Title
JP2004339019A (ja) * 2003-05-16 2004-12-02 Asahi Glass Co Ltd 強化ガラス部材およびそれを用いたディスプレイ用真空外囲器
JP2008247732A (ja) * 2007-03-02 2008-10-16 Nippon Electric Glass Co Ltd 強化板ガラスとその製造方法
JP2012101975A (ja) * 2010-11-10 2012-05-31 Asahi Glass Co Ltd フラットパネルディスプレイ用カバーガラス及びその製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004339019A (ja) * 2003-05-16 2004-12-02 Asahi Glass Co Ltd 強化ガラス部材およびそれを用いたディスプレイ用真空外囲器
JP2008247732A (ja) * 2007-03-02 2008-10-16 Nippon Electric Glass Co Ltd 強化板ガラスとその製造方法
JP2012101975A (ja) * 2010-11-10 2012-05-31 Asahi Glass Co Ltd フラットパネルディスプレイ用カバーガラス及びその製造方法

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013125118A (ja) * 2011-12-14 2013-06-24 Konica Minolta Advanced Layers Inc ディスプレイ用カバーガラス
JP2015151329A (ja) * 2014-02-19 2015-08-24 日本電気硝子株式会社 強化ガラスの製造方法及び強化ガラス
WO2015125584A1 (fr) * 2014-02-19 2015-08-27 日本電気硝子株式会社 Procédé de fabrication du verre trempé et verre trempé
US11565969B2 (en) 2016-05-19 2023-01-31 Apple Inc. Asymmetric chemical strengthening
US12012356B2 (en) 2016-05-19 2024-06-18 Apple Inc. Asymmetric chemical strengthening
US11203550B2 (en) 2018-04-27 2021-12-21 AGC Inc. Chemically strengthened glass plate, portable information terminal, and manufacturing method of chemically strengthened glass plate
US11639307B2 (en) 2018-07-13 2023-05-02 Apple Inc. Patterned asymmetric chemical strengthening
US11905205B2 (en) 2018-12-20 2024-02-20 Apple Inc. Strengthened covers for electronic devices

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