WO2013154034A1 - 強化ガラス物品及びタッチセンサ一体型カバーガラス - Google Patents
強化ガラス物品及びタッチセンサ一体型カバーガラス Download PDFInfo
- Publication number
- WO2013154034A1 WO2013154034A1 PCT/JP2013/060380 JP2013060380W WO2013154034A1 WO 2013154034 A1 WO2013154034 A1 WO 2013154034A1 JP 2013060380 W JP2013060380 W JP 2013060380W WO 2013154034 A1 WO2013154034 A1 WO 2013154034A1
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- WIPO (PCT)
- Prior art keywords
- glass plate
- tempered glass
- main surface
- face
- protective layer
- Prior art date
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B33/00—Severing cooled glass
- C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor
-
- 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
- C03C15/00—Surface treatment of glass, not in the form of fibres or filaments, by etching
- C03C15/02—Surface treatment of glass, not in the form of fibres or filaments, by etching for making a smooth surface
-
- 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
- C03C17/28—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material
- C03C17/32—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material with synthetic or natural resins
-
- 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
-
- 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
- C03C21/001—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions
- C03C21/002—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions to perform ion-exchange between alkali ions
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24777—Edge feature
Definitions
- the present invention relates to a tempered glass article and a touch sensor integrated cover glass.
- Capacitive touch panels used for mobile terminals such as smartphones and tablet computers generally form a translucent input position detection electrode on a glass substrate, and a cover glass made of a tempered glass plate is disposed thereon. Consists of.
- Patent Document 1 the glass substrate is not required by directly providing an input position detection electrode or the like on the cover glass for the purpose of reducing the number of parts of the capacitive touch panel and reducing the thickness.
- An electrostatic capacitance type touch panel is disclosed.
- a cover glass also referred to as a touch sensor-integrated cover glass
- film formation processing, patterning processing, and the like are performed on a large-sized base plate capable of taking a large number of product-size cover glasses. From the viewpoint of productivity, it is preferable to form an input position detection electrode or the like for each product size and then cut the base plate for each product size to obtain a cover glass.
- the main surfaces of the front and back surfaces of the tempered glass plate have a compressive stress layer and a tensile stress layer inside, it is difficult to cut the tempered glass plate with high quality in the first place.
- the so-called wheel cutting method in which a cutting line is applied to the main surface of the glass plate with a wheel cutter along the planned cutting line and then cut, the so-called wheel cutting method, there are many rough cuts on the tempered glass plate, May be a problem in strength.
- the end face of the tempered glass plate is polished to remove scratches that cause breakage and to make the end face less than a predetermined roughness. Is an effective measure.
- Patent Document 2 discloses a polishing apparatus that presses a rotating polishing brush against an end surface of a glass plate to polish the end surface.
- chamfering or polishing of the end face may be omitted.
- a cutting method in which the end surface is a mirror surface a method of cutting using a CO 2 laser or the like can be applied.
- the present invention has been made in view of such circumstances, and in a tempered glass plate having a tensile stress layer exposed at the end face, the tempered glass article and the touch sensor integrated cover glass having an enhanced end face strength.
- the purpose is to provide.
- the present invention provides a glass plate having a first main surface, a second main surface opposite to the first main surface, and an end face connecting the first main surface and the second main surface.
- the glass plate is a tempered glass plate in which the first main surface and the second main surface have a compressive stress layer on a surface layer and a tensile stress layer on the end surface, and the end surface of the tempered glass plate has an arithmetic average.
- roughness Ra is Ra ⁇ 3 [mu] m
- the protective layer is provided on the end faces
- the maximum thickness of the protective layer is T 1
- the thickness of the tempered glass plate is taken as T 0, wherein T 1 is , 50 ⁇ m ⁇ T 1 ⁇ 2T 0 .
- the glass plate of the tempered glass article of the present invention is a tempered glass plate cut after tempering.
- the tempered glass sheet cut after the tempering has a tensile stress layer exposed at the end face.
- the arithmetic average roughness Ra of the end face is set to 3 ⁇ m or less as the first step, and the strength (bending strength) of the end face itself of the tempered glass sheet is increased.
- a protective layer is provided on the end face with increased end face strength.
- the strength of the end face of the tempered glass plate itself is enhanced by setting Ra to 3 ⁇ m or less.
- the strength of the end surface itself of the tempered glass sheet itself is not increased by providing the protective layer, a decrease in strength at the time of injury can be suppressed by using a glass article provided with the protective layer.
- the state in which the decrease in the end face strength of the glass article after the damage (hereinafter referred to as “braded edge strength”) is suppressed is referred to as “the wound end face strength has been increased”.
- the maximum thickness T 1 of the protection layer is 50 ⁇ m or less, it is impossible to obtain sufficient durability for a thin thickness of the protective layer.
- T 1 exceeds 2T 0 , the dimensional accuracy of the tempered glass plate including the protective layer is lowered, which is not preferable.
- a protective layer becomes easy to drop
- the T 1 is more preferably 50 ⁇ m ⁇ T 1 ⁇ 1.5T 0 and more preferably 50 ⁇ m ⁇ T 1 ⁇ T 0 from the viewpoint of ensuring the durability of the protective layer and preventing falling off.
- the maximum thickness T 1 of the protective layer is 50 ⁇ m ⁇ T 1 ⁇ 2200 ⁇ m.
- the maximum thickness T 1 of the protective layer is preferably 300 to 1000 ⁇ m, and more preferably 400 to 600 ⁇ m.
- the arithmetic average roughness Ra of the end surface can be 3 ⁇ m or less. That is, the front end of the scratch on the end face of the tempered glass plate is etched by the etching process and rounded into an arc shape. It is preferable that the etching amount (etching removal) of the end surface of the tempered glass plate in the etching process is about 5 ⁇ m.
- International Publication No. 2010/135614 discloses a technique for coating the end face of a glass plate, but the glass plate targeted by this technique is not a tempered glass plate cut after tempering. Therefore, International Publication No. 2010/135614 does not have a technical idea of increasing the end face strength of a tempered glass sheet cut after tempering in two stages.
- the end face of the tempered glass plate preferably has an arithmetic average roughness Ra of Ra ⁇ 20 nm.
- the arithmetic average roughness Ra can be reduced to 20 nm or less by polishing the end face of the tempered glass plate after cutting by contacting a rotating brush while supplying a polishing liquid containing an abrasive.
- the protective layer has a thickness T 2 of 30 ⁇ m ⁇ T 2 at a boundary position between the compressive stress layer and the tensile stress layer of the tempered glass plate.
- the depth of the damage in the thickness direction of the protective layer generated in the scratch endurance test was not even 30 ⁇ m even when it was deep, by setting the thickness T 2 to 30 ⁇ m or more, the end face of the tempered glass plate The scratches can be prevented from reaching and durability can be maintained.
- the protective layer has an extending portion that extends to at least one main surface of the first main surface and the second main surface.
- the tempered glass plate is a tempered glass plate used for a touch sensor-integrated cover glass
- the length X of the extending portion that is, the length X from the boundary portion between the end surface of the tempered glass sheet and the main surface toward the surface of the main surface is preferably 10 ⁇ m ⁇ X ⁇ 200 ⁇ m. .
- the value of the length X is 10 ⁇ m or more, it is possible to prevent the damage end face strength from being lowered, and the contact area between the tempered glass plate and the protective layer is increased, thereby improving the adhesion between them. Moreover, when X is 200 ⁇ m or less, the appearance is not deteriorated, and it is not hindered when a protective film for preventing scattering of glass pieces at the time of crushing is applied in a later step.
- the thickness Y of the extending portion that is, the thickness Y in the perpendicular direction of the main surface of the tempered glass plate is 10 ⁇ m ⁇ Y ⁇ 100 ⁇ m.
- the scratched end surface strength against the force from the oblique direction with respect to the normal of the end surface is improved.
- the value of the thickness Y is 10 ⁇ m or more, it is possible to prevent the damage end face strength from being lowered.
- Y is 100 ⁇ m or less, the appearance is not deteriorated, and it is not hindered when a protective film is applied in a later step.
- the protective layer is preferably a photocurable resin or a thermosetting resin.
- the protective layer is preferably an ultraviolet curable resin.
- the present invention provides a touch sensor-integrated cover glass including the tempered glass article of the present invention.
- the tempered glass plate described in this specification is a glass plate in which a compressive stress layer is formed on the first main surface and the second main surface on the front and back sides, and in order to balance the stress, A stress layer is formed.
- an air-cooled tempering method which is a physical tempering method utilizing the expansion and contraction of glass by heating and cooling, and exchange of alkali ions in the glass with other alkali ions having a larger ion radius.
- Chemical strengthening methods are known. Since the cover glass for the touch sensor integrated type is as thin as 0.5 to 1.1 mm, the latter chemical strengthening method is applied.
- the tempered glass article and the touch sensor-integrated cover glass of the present invention it is possible to provide a tempered glass article whose end face strength is enhanced in a tempered glass sheet having a tensile stress layer exposed at the end face.
- FIG. 1 is a cross-sectional view schematically showing a configuration of a sensor-integrated cover glass.
- FIG. 2 is a flowchart showing an example of a manufacturing process of the sensor-integrated cover glass.
- 3A and 3B are cross-sectional views of the end face schematically showing the roughness of the end face immediately after cutting and the roughness of the end face after the etching process.
- FIG. 4 is a side view of a brush polishing apparatus for polishing an end surface of a glass plate.
- 5A and 5B are cross-sectional views of the end face schematically showing the roughness of the end face immediately after cutting and the roughness of the end face after the polishing treatment.
- FIG. 6 (a) to 6 (c) are explanatory views showing a process of applying a protective layer to the end face of the glass plate.
- FIG. 7 is an enlarged cross-sectional view of the end face and the protective layer showing an example of the cross-sectional shape of the protective layer.
- a cover glass that constitutes an input operation surface of a capacitive touch panel of a mobile terminal such as a smartphone or a tablet computer in particular, a cover glass with an integrated touch sensor is illustrated.
- FIG. 1 is an enlarged cross-sectional view of a main part schematically showing the configuration of a touch sensor-integrated cover glass 1.
- the touch sensor integrated cover glass 1 constitutes an input operation surface of the capacitive touch panel, and functions as a cover glass for protecting the display and a sensor substrate on which input position detection electrodes and the like are formed. Have both.
- the touch sensor-integrated cover glass 1 connects the first main surface 10A that is an input operation surface, the second main surface 10B that faces the first main surface 10A, and the first main surface 10A and the second main surface 10B.
- the glass plate 10 is a tempered glass plate, and a compressive stress layer A is provided on each surface layer of the first main surface 10A and the first main surface 10A, and a tensile stress layer B is exposed on the end face 10C.
- the end face 10C is provided with a protective layer 40 that protects the end face 10C.
- the protective layer 40 will be described later.
- the second main surface 10B of the glass plate 10 is provided with an input position detection electrode 12 constituting a touch sensor, a black light shielding layer 14, a peripheral wiring 16, a protective film 18, and the like.
- the glass plate 10 is a tempered glass plate.
- the thickness of the glass plate 10 is usually about 0.3 to 1.5 mm, preferably 0.5 to 1.1 mm.
- Such a thin glass plate 10 is a tempered glass plate strengthened by a chemical strengthening method.
- the end surface 10C of the glass plate 10 is chamfered as necessary. That is, the chamfered surface 11 having a predetermined width is formed by grinding the ridge angle portion at the boundary portion between the first main surface 10A and the end surface 10C and the ridge angle portion at the boundary portion between the second main surface 10B and the end surface 10C.
- the chamfered surface 11 may be a so-called C chamfer or an R chamfer.
- the input position detection electrode 12 is made of a translucent conductive film such as an ITO (Indium Tin Oxide) film or the like on the central region of the second main surface 10B of the glass plate 10 (effective display means such as a liquid crystal display panel). A film is formed in the pixel region). The thickness of the translucent conductive film constituting the input position detecting electrode 12 is about 20 to 100 nm.
- the light shielding layer 14 is formed to hide outside the display area of the display panel, and is formed in a region around the central region where the input position detecting electrode 12 is formed, that is, in the peripheral region.
- the light shielding layer 14 is made of, for example, a black photosensitive resin (photoresist) containing titanium black or the like.
- the thickness of the light shielding layer 14 is about 1 to 2 ⁇ m.
- the light shielding layer 14 can also be formed by a screen printing method or the like. However, when the printing method is used, since the thickness of the light shielding layer 14 is as thick as about 10 to 30 ⁇ m, it is preferable to use a photoresist for the light shielding layer 14.
- the peripheral wiring 16 is formed of a film made of a metal such as Mo—Nb alloy / Al / Mo—Nb alloy, Mo—Nb alloy / Al—Nd alloy / Mo—Nb alloy on the light shielding layer 14.
- the thickness of the metal film constituting the peripheral wiring 16 is about 0.3 to 0.5 ⁇ m.
- the protective film 18 is mainly formed for the purpose of protecting the input position detection electrode 12, the light shielding layer 14, and the peripheral wiring 16 so as to cover the input position detection electrode 12, the light shielding layer 14, and the peripheral wiring 16.
- the protective film 18 is formed of a translucent photoresist.
- the thickness of the protective film 18 is about 1 to 2 ⁇ m.
- FIG. 2 is a flowchart showing an example of a manufacturing process of the touch sensor-integrated cover glass 1.
- the touch sensor-integrated cover glass 1 is formed with an electrode for detecting an input position on a base plate (large size glass plate) on which a large number of product size glass plates 10 can be taken, and then the base plate is made into a product size glass plate. It is manufactured by cutting into 10.
- a tempered glass plate is used as the base plate.
- the tempered glass plate is manufactured by air-cooling tempering, which is a physical tempering method that utilizes expansion and contraction of glass by heating and cooling, and chemistry for exchanging alkali ions in the glass with other alkali ions having a larger ion radius.
- air-cooling tempering which is a physical tempering method that utilizes expansion and contraction of glass by heating and cooling, and chemistry for exchanging alkali ions in the glass with other alkali ions having a larger ion radius.
- the tempering method is known, the chemical tempering method is applied to the cover glass having a small thickness as described above.
- step S1 In manufacturing the touch sensor-integrated cover glass 1, first, as shown in FIG. 2, a process of chemically strengthening an unstrengthened base plate is performed (step S1).
- step S2 the input position detection electrode 12, the light shielding layer 14, the peripheral wiring 16, the protective film 18 and the like are formed on the second main surface 10B of the base plate, and sensors are assembled on the base plate in units of products (step S2). ). Since a method for assembling these sensors is a known technique, a specific description thereof will be omitted.
- the base plate is cut into product-sized glass plates 10, and a plurality of glass plates 10 are taken (step S3).
- the base plate is cut by, for example, a wheel cutting method, a laser cutting method, or the like.
- the laser cutting method is a method in which a main surface of a base plate is irradiated with laser light along a planned cutting line and cut.
- a discharge electrode can be used instead of the laser light source.
- each glass plate 10 is cut
- the end surface 10C of the glass plate 10 is chamfered (step S4).
- a rotating grindstone is brought into contact with the end surface 10C of the glass plate 10, and the ridge angle portion at the boundary between the first main surface 10A and the end surface 10C of the glass plate 10, the second main surface 10B, and the end surface 10C This is done by grinding and removing the ridge angle portion of the boundary.
- chamfering can be performed by other methods.
- the end surface 10C of the glass plate 10 means a cut surface when the base plate is cut, and includes a chamfered surface 11 when chamfering is performed after cutting.
- this chamfering process is a selectively performed process. That is, the chamfering after cutting is not necessarily a process that must be performed, but is a process that is selectively performed as necessary. However, by performing this chamfering process, the edge portion of the glass plate 10 (the ridge angle portion of the boundary between the first main surface 10A and the end surface 10C of the glass plate 10 and the ridge angle of the boundary between the second main surface 10B and the end surface 10C). There is an advantage that cracking of (part) can be effectively prevented.
- the glass plate 10 that is a tempered glass plate is obtained by cutting a chemically strengthened base plate.
- the cut glass plate 10 has the tensile stress layer B exposed at the end face 10C.
- the flaw which causes damage exists in the end surface 10C from which the tensile-stress layer B was exposed the glass plate 10 may be easily damaged starting from the flaw.
- the end surface 10C of the glass plate 10 is subjected to an etching process or a polishing process ( Step S5).
- the etching process By applying the etching process to the end face 10C, it is possible to obtuse the sharpened part of the concavo-convex part of the scratch that causes the crack of the glass plate 10, and by applying the polishing process to the end face 10C, the scratches are removed. Since it can remove, the end surface intensity
- the end face 10C of the glass plate 10 is immersed in a mixed aqueous solution containing 2 wt% HF in 6 mol / L HCl, and the end face 10C is dissolved by 5 ⁇ m from the surface layer.
- FIG. 3A is a cross-sectional view of the end face 10C schematically showing the roughness (shape) of the end face 10C immediately after cutting
- FIG. 3B is the roughness (shape) of the end face 10C after the etching process. It is sectional drawing of 10 C of end surfaces which showed typically.
- the sharp bottom portion of the concave portion and the sharp tip portion of the convex portion are melted in an arc shape among the concave and convex portions of the scratch on the end face 10C of the glass plate 10. Since the obtuse angle is obtained and the arithmetic average roughness Ra of the end face 10C is 3 ⁇ m or less, the end face strength is increased. Note that the etching amount (removal allowance) of the end face 10C in the etching process is preferably about 5 ⁇ m.
- FIG. 4 is a side view of the brush polishing apparatus 30 that polishes the end face 10 ⁇ / b> C of the glass plate 10.
- a brush polishing apparatus 30 shown in FIG. 4 forms a laminated body 20 by laminating a plurality of (for example, 200) glass plates 10, and polishes the outer peripheral portion of the laminated body 20 with a polishing brush 34 that rotates.
- the end surfaces 10C of the individual glass plates 10 are polished together.
- the brush polishing apparatus 30 includes a laminate holding unit 32, a polishing brush 34, a driving unit (not shown) that drives the polishing brush 34, and a polishing liquid supply unit 36 that supplies a polishing liquid 38.
- the laminate holder 32 holds the laminate 20 in a detachable manner.
- the stacked body 20 is sandwiched and held from both sides in the stacking direction.
- the polishing brush 34 includes a shaft 34A and a large number of brush hairs 34B provided radially on the outer periphery of the shaft 34A.
- the shaft 34A is formed in a cylindrical shape having a predetermined outer diameter.
- the brush bristles 34B are provided on the outer periphery of the shaft 34A by spirally wrapping the ones implanted in the belt-like body around the outer periphery of the shaft 34A.
- the brush bristles 34B are made of, for example, a flexible wire made of polyamide resin or the like.
- the wire may contain particles such as alumina (Al 2 O 3 ), silicon carbide (SiC), and diamond.
- the polishing liquid supply unit 36 supplies the polishing liquid to the contact portion between the polishing brush 34 and the laminate 20.
- the polishing liquid 38 contains an abrasive and a dispersion medium, and is adjusted to a predetermined specific gravity.
- abrasive For example, cerium oxide, zirconia, or the like is used as the abrasive.
- the average particle diameter (D50) of the abrasive is, for example, 5 ⁇ m or less, preferably 2 ⁇ m or less.
- the specific gravity of the polishing liquid is preferably 1.1 to 1.4.
- the polishing brush 34 is rotated at a constant rotation speed.
- the polishing brush 34 is moved horizontally toward the laminate 20, and the abrasive brush 34 is pressed and brought into contact with the outer peripheral portion of the laminate 20. At this time, the polishing brush 34 is moved horizontally so as to come into contact with a predetermined pushing amount.
- the polishing liquid is supplied at a predetermined supply amount from the polishing liquid supply unit 36 to the contact portion between the polishing brush 34 and the laminate 20.
- the polishing brush 34 is reciprocated at a predetermined speed in the axial direction (lamination direction of the glass plate 10).
- the end surface 10C of the glass plate 10 of several sheets can be grind
- FIG. 5A is a cross-sectional view of the end face 10C schematically showing the roughness (shape) of the end face 10C immediately after cutting
- FIG. 5B is the roughness (shape) of the end face 10C after the polishing process. It is sectional drawing of 10 C of end surfaces which showed typically.
- the uneven portions of the scratches on the end face 10C of the glass plate 10 are polished and removed by the polishing brush 34, and the arithmetic average roughness Ra of the end face 10C becomes 20 nm or less. End face strength is increased.
- the end face 10C of the glass plate 10 is subjected to an etching process or a polishing process, whereby the strength of the end face 10C is increased.
- step S6 the process which equips the end surface 10C of the glass plate 10 with the protective layer 40 is performed.
- the laser sensor 42 is run along the end surface 10C of the glass plate 10, and the shape and length of the end surface 10C are acquired.
- the height from the end face 10C of the application nozzle 44 is controlled based on the length and shape acquired by the laser sensor 42, and the application nozzle 44 is moved along the end face 10C.
- the ultraviolet curable resin 46 is supplied from the coating nozzle 44 toward the end face 10C.
- the ultraviolet curable resin 46 to be the protective layer 40 is applied to the end face 10C.
- an ultraviolet irradiation lamp 48 is run along the end face 10C to irradiate the ultraviolet curable resin 46 with ultraviolet rays.
- the ultraviolet curable resin 46 is cured, and the protective layer 40 is provided on the end face 10C.
- the protective layer 40 is an ultraviolet curable resin that is a photocurable resin, it may be a thermosetting resin.
- cross-sectional shape of the protective layer 40 may be a semicircular shape as shown in FIG.
- the end surface 10C of the glass plate 10 of the touch sensor-integrated cover glass 1 has an arithmetic average roughness Ra of 3 ⁇ m or less due to the first-stage etching process, and the strength of the end surface 10C itself of the glass plate 10 is increased. Has been enhanced.
- the protective layer 40 is formed on the end surface 10C with increased end surface strength. Thereby, since the end surface 10C of the glass plate 10 of embodiment is protected by the protective layer 40, the said damage end surface intensity
- the glass plate 10 of the embodiment it is possible to provide a tempered glass article in which the scratched end surface strength is increased in the glass plate 10 in which the tensile stress layer is exposed on the end surface 10C.
- the end surface 10C of the glass plate 10 of the touch sensor integrated cover glass 1 has an arithmetic average roughness Ra of 20 nm or less due to the first stage polishing process, and the strength of the end surface 10C itself of the glass plate 10 is increased. Has been enhanced.
- the protective layer 40 is formed on the end surface 10C with increased end surface strength.
- the glass plate 10 of the embodiment it is possible to provide a tempered glass article in which the scratched end surface strength is increased in the glass plate 10 in which the tensile stress layer is exposed on the end surface 10C.
- T 1 is preferably 50 ⁇ m ⁇ T 1 ⁇ 2T 0 .
- the maximum thickness T 1 of the protection layer 40 is 50 ⁇ m or less, to obtain a thin thickness for sufficient durability of the protective layer 40
- T 1 exceeds 2T 0
- the dimensional accuracy of the glass plate 10 including the protective layer 40 is lowered, which is not preferable.
- the protective layer 40 becomes easy to drop
- the maximum thickness T 1 of the protective layer 40 is 50 ⁇ m ⁇ T 1 ⁇ 2200 ⁇ m. Considering the coating efficiency of 40, the maximum thickness T 1 of the protective layer 40 is preferably about 400 to 1000 ⁇ m.
- the thickness T 2 of the protective layer 40 at the boundary position C between the compressive stress layer A and the tensile stress layer B of the glass plate 10 is preferably 30 ⁇ m ⁇ T 2 .
- the thickness direction of the wound depth of the protective layer 40 that occurs in later-described scratching strength test was less than 30 [mu] m, by the the second thickness T 2 or more 30 [mu] m, the scratch reaches the end face 10C of the glass plate 10 Can be prevented and durability can be maintained.
- the protective layer 40 has an extending portion 41 that extends to at least one main surface of the first main surface 10A and the second main surface 10B.
- the scratched end surface strength of the edge portion of the glass plate 10 can be increased.
- the extending portion 41 can be provided on both the first main surface 10A and the second main surface 10B, but the tempered glass in which the glass plate 10 is used for the touch sensor integrated cover glass 1 as shown in FIGS. In the case of a plate, it is preferable not to extend the extending portion 41 on the first main surface 10A which is a touch surface. This is because the extended portion 41 is exposed to the outside, and the appearance of the touch sensor-integrated cover glass 1 looks worse.
- the length X of the extending part 41 is preferably 10 ⁇ m ⁇ X ⁇ 200 ⁇ m.
- the length X is a length from the boundary portion between the end surface 10C of the glass plate 10 and the second main surface 10B toward the second main surface 10B.
- the value of X is 10 ⁇ m or more, it is possible to prevent the damage end face strength from being lowered, and the contact area between the tempered glass plate and the protective layer is increased, thereby improving the adhesion between them.
- the value of X is 200 ⁇ m or less, the appearance is not deteriorated, and the protective film is not hindered in a later step.
- the thickness Y of the extending part 41 is preferably 10 ⁇ m ⁇ Y ⁇ 100 ⁇ m.
- the thickness Y is the thickness of the second main surface 10B of the glass plate 10 in the perpendicular direction.
- Y When the value of Y is 10 ⁇ m or more, it is possible to prevent a decrease in the strength of the wound end face. When the thickness is 100 ⁇ m or less, the appearance is not deteriorated, and the protective film is not hindered in a later step.
- Examples 1 to 4 described later are comparative examples, and Examples 5 to 7 are examples.
- An ultraviolet curable resin (photosensitive resin manufactured by Sekisui Chemical Co., Ltd., trade name: Photorec) was injected from the coating nozzle onto the end face of the tempered glass plate of Examples 4 to 7, and then irradiated with ultraviolet rays. And cured to form a protective layer to obtain a tempered glass article.
- the tempered glass articles of Examples 4 and 5 were formed in a shape having no extension part, and the tempered glass articles of Examples 6 and 7 were formed in a form having an extension part.
- a # 400 waterproof paper (manufactured by Riken Corundum Co., Ltd.) is attached to a load fluctuation type frictional wear system (manufactured by Shinto Kagaku Co., Ltd .: HHS2000), and this waterproof paper is 120 gf ( 1.2N) and pressed against the first main surface 10A or the second main surface 10B at an angle of 20 °, and wounded once at a speed of 20 mm / second along the end face 10C.
- the end surface of the tempered glass plate 3 or the surface of the protective layer of the tempered glass article of Examples 4 to 7 was damaged.
- the tempered glass sheets of Examples 1 to 3 that do not have a protective layer and the tempered glass article of Example 4 in which the maximum thickness of the protective layer is 50 ⁇ m or less are compared with the end face strength after scratching (additional strength). The flaw edge strength was significantly reduced.
- the end surfaces are protected by a protective film, and even when the end surfaces of the tempered glass articles are scratched, the tempered glass sheets are not damaged, and the end face strength is reduced. could be suppressed.
- the tempered glass article of the present invention is the glass of the touch sensor-integrated cover glass 1. It is not limited to the plate 10.
- SYMBOLS 1 Touch sensor integrated cover glass, 10 ... Glass plate (tempered glass plate), 10A ... 1st main surface, 10B ... 2nd main surface, 10C ... End surface, 11 ... Chamfering surface, 12 ... Input position detection electrode, DESCRIPTION OF SYMBOLS 14 ... Light shielding layer, 16 ... Peripheral wiring, 18 ... Protective film, 20 ... Laminated body, 22 ... Space
Abstract
Description
前記ガラス板は、前記第1主表面及び前記第2主表面が表層に圧縮応力層を有するとともに前記端面に引張応力層を有する強化ガラス板であり、前記強化ガラス板の前記端面は、算術平均粗さRaがRa≦3μmであり、該端面に保護層が備えられ、前記保護層の最大厚さをT1とし、前記強化ガラス板の厚さをT0としたときに、前記T1は、50μm<T1≦2T0である強化ガラス物品を提供する。
図1は、タッチセンサ一体型カバーガラス1の構成を概略的に示した要部拡大断面図である。
図2は、タッチセンサ一体型カバーガラス1の製造工程の一例を示すフローチャートである。
一例として、6mol/LのHCl中に2wt%のHFを含む混合水溶液にガラス板10の端面10Cを浸漬し、端面10Cを表層から5μm溶解させる。
図4は、ガラス板10の端面10Cを研磨するブラシ研磨装置30の側面図である。
図6(a)~6(c)には、ガラス板10の端面10Cに保護層40を塗布する工程が示されている。
〔エッチング処理及び保護層による効果〕
タッチセンサ一体型カバーガラス1のガラス板10の端面10Cは、1段階目のエッチング処理によって、端面10Cの算術平均粗さRaが3μm以下となっており、ガラス板10の端面10C自体の強度が高められている。そして、2段階目として、端面強度が高められた端面10Cに保護層40を形成している。これにより、実施の形態のガラス板10の端面10Cが、保護層40によって保護されるので、前記加傷端面強度がより一層高められる。
タッチセンサ一体型カバーガラス1のガラス板10の端面10Cは、1段階目の研磨処理によって、端面10Cの算術平均粗さRaが20nm以下となっており、ガラス板10の端面10C自体の強度が高められている。そして、2段階目として、端面強度が高められた端面10Cに保護層40を形成している。これにより、実施の形態のガラス板10の端面10Cが保護層40によって保護されるので、前記加傷端面強度がより一層高められる。
図1に示すように、保護層40の最大厚さをT1とし、ガラス板10の厚さをT0としたときに、T1は、50μm<T1≦2T0であることが好ましい。
SiO2:64.2モル%、Al2O3:8.0モル%、MgO:10.5モル%、CaO:0.1モル%、SrO:0.1モル%、BaO:0.1モル%、Na2O:12.5モル%、K2O:4.0モル%、ZrO2:0.5モル%からなるアルカリアルミノシリケートガラスを用い、寸法50×100mm、厚さ0.8mmの試験片とした。
KNO3溶融塩にて410℃、1時間でイオン交換を行い、例1~7のガラス板(試験片)のすべてについて、表層の圧縮応力値CS:700MPa、圧縮応力層の深さDOL:18μm、内部の引張応力値CT:16MPaとなるように化学強化を施した。
化学強化を施した例1、2及び4~6の強化ガラス板について、ホイールカッタを用いて切断し、例3及び例7の強化ガラス板はCO2レーザを用いて切断した。
例1、2及び4~6の強化ガラス板について、番手#600の砥石を備えたコンピュータ数値制御(CNC)面取り装置を用いて端面を0.2mm研削した。
例1の強化ガラス板について、端面を5μmエッチングした。エッチング液としては、フッ酸・塩酸混合液を用いた。
例2及び4~6の強化ガラス板について、研磨砥粒を含有する研磨液を供給しながら回転ブラシを接触させて0.1mm研磨した。研磨砥粒は酸化セリウム粒子を用いた。
紫外線硬化樹脂(積水化学社製感光性樹脂、商品名:フォトレック)を、塗布ノズルから例4~7の強化ガラス板の端面に所望量の前記紫外線硬化樹脂を射出した後、紫外線を照射して硬化せしめ、保護層を形成して強化ガラス物品とした。
荷重変動型摩擦磨耗システム(新東科学株式会社製:HHS2000)に、#400の耐水ペーパー(理研コランダム社製)を取り付け、この耐水ペーパーを例1~7の強化ガラス物品の保護層に120gf(1.2N)の荷重で、第1主表面10Aまたは第2主表面10Bに対して20°の角度で押し付けるとともに、端面10Cに沿って20mm/秒の速度で1回加傷させて例1~3の強化ガラス板の端面または例4~7の強化ガラス物品の保護層の表面を加傷した。
例1~7の強化ガラス物品について、いずれもJIS R1601(2008年制定)に定められる方法により平均4点曲げ強度を測定した。
本出願は、2012年4月10日出願の日本特許出願2012-089040に基づくものであり、その内容はここに参照として取り込まれる。
Claims (9)
- 第1主表面及び該第1主表面に対向する第2主表面並びに前記第1主表面と前記第2主表面とを連結する端面を有するガラス板を備え、
前記ガラス板は、前記第1主表面及び前記第2主表面が表層に圧縮応力層を有するとともに前記端面に引張応力層を有する強化ガラス板であり、
前記強化ガラス板の前記端面は、算術平均粗さRaが、Ra≦3μmであり、該端面に保護層が備えられ、
前記保護層の最大厚さをT1とし、前記強化ガラス板の厚さをT0としたときに、前記T1は、50μm<T1≦2T0である強化ガラス物品。 - 前記強化ガラス板の前記端面は、算術平均粗さRaが、Ra≦20nmである請求項1に記載の強化ガラス物品。
- 前記保護層は、前記強化ガラス板の前記圧縮応力層と前記引張応力層の境界位置における厚さT2が、30μm≦T2である請求項1又は2に記載の強化ガラス物品。
- 前記保護層は、前記第1主表面及び前記第2主表面の少なくとも一方の主表面に延在する延在部を有する請求項1~3のいずれか1項に記載の強化ガラス物品。
- 前記強化ガラス板の前記端面と前記主表面との境界部から前記主表面の面内に向けての前記延在部の長さXは、10μm≦X≦200μmである請求項4に記載の強化ガラス物品。
- 前記強化ガラス板の前記主表面の垂線方向における前記延在部の厚さYは、10μm≦Y≦100μmである請求項4又は5に記載の強化ガラス物品。
- 前記保護層は、光硬化樹脂又は熱硬化樹脂である請求項1~6のいずれか1項に記載の強化ガラス物品。
- 前記保護層は、紫外線硬化樹脂である請求項7に記載の強化ガラス物品。
- 前記請求項1~8のいずれか1項に記載の強化ガラス物品を含むタッチセンサ一体型カバーガラス。
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JP2016027382A (ja) * | 2014-06-30 | 2016-02-18 | 大日本印刷株式会社 | カバーガラス、カバーガラス付き表示装置およびカバーガラスの製造方法 |
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US11123959B2 (en) | 2014-10-07 | 2021-09-21 | Corning Incorporated | Glass article with determined stress profile and method of producing the same |
US11167528B2 (en) | 2015-10-14 | 2021-11-09 | Corning Incorporated | Laminated glass article with determined stress profile and method for forming the same |
JPWO2017126408A1 (ja) * | 2016-01-22 | 2018-11-15 | ショーダテクトロン株式会社 | 端面塗布装置 |
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Also Published As
Publication number | Publication date |
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CN104245615A (zh) | 2014-12-24 |
US20150030816A1 (en) | 2015-01-29 |
TW201348169A (zh) | 2013-12-01 |
KR20140144212A (ko) | 2014-12-18 |
JPWO2013154034A1 (ja) | 2015-12-17 |
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