JP2015182910A - Cover glass and method for forming outer peripheral side face part of cover glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide cover glass using strengthened glass as a substrate, capable of easily and efficiently disposing a cured resin for protection to a side face at an outer periphery of the substrate to have a good quality, and also to provide a method for forming an outer peripheral side face part of cover glass.SOLUTION: In cover glass 1, a substrate 10 uses strengthened glass having strengthening treatment on a surface, and a cured resin 17a for protection is disposed to a side face at an outer periphery 1a of the substrate 10. In a cross-sectional shape in a direction orthogonal to the outer periphery of the substrate 10, the side face at the outer periphery of the substrate 10 consists of a side face of a large-sized first recess 15a formed by etching to recess from one side of the substrate 10; and a side face of a small-sized second recess 15b formed by etching to recess from the other side of the substrate 10.

Description

  The present invention relates to a cover glass for a display device.

In recent years, electronic devices using a display device such as a liquid crystal display device or an organic EL display device as a flat display panel have been widely used, and in particular, mobile terminal devices such as mobile phones, smartphones, tablets, etc. have been particularly popular.
As shown in FIG. 8A, such a mobile terminal device is usually a touch panel in which a first electrode part 132 and a second electrode part 133 for forming a touch sensor are arranged on a base material 131 made of a film. A touch panel (also referred to as a touch panel device) 120 configured by bonding the sensor unit 130 and a protective cover glass (hereinafter referred to as a cover glass) 140 is bonded to the display device 110 of the mobile terminal device. The cover glass 140 protects the surface.
Recently, in view of productivity, cost, bonding position accuracy, etc., instead of the touch panel 120 shown in FIG. 8A, a touch glass is directly touched on one side of the cover glass (corresponding to 140 in FIG. 8). A first electrode part for sensor formation (corresponding to 132 in FIG. 8) and a second electrode part (corresponding to 133 in FIG. 8) are arranged, and the touch sensor is formed integrally with the cover glass, As a method of integrating as a touch panel, OGS (one glass solution) has come to be adopted.

The cover glass 140 for the protective cover used in the touch panel 120 is conventionally supplied by a glass maker with a large-sized tempered glass whose surface has been chemically strengthened. Separated into a base material and molded.
The glass substrate for individual cover glass that has been singulated and molded in this way, when viewed from the direction orthogonal to the surface direction of the glass substrate, a through hole portion having a rectangular through hole, The through-hole part which has a round-shaped through-hole, and the recessed part recessed in the glass base material side partially are provided.
The chemical strengthening treatment is performed, for example, by replacing the alkali ions contained in the glass with other alkali ions having a larger ion radius at a temperature below the strain point, so that the ions are exchanged near the surface. It is strengthened by forming a compressive stress layer that generates a compressive stress.
Aluminosilicate glass is usually used as a glass material to be chemically strengthened for portable terminal devices such as smartphones and tablets.
The thickness of the compressive stress layer is in the range of 10 to 100 μm.
Even after chemical strengthening treatment, it can be processed and molded with an etching solution, and mechanical processing such as cutting and drilling is possible.
Here, the glass whose surface has been reinforced by chemical strengthening treatment is also referred to as tempered glass or tempered glass substrate.

However, the glass substrate for individual cover glass that has been singulated and molded in this way is an unstrengthened portion that is not subjected to chemical strengthening treatment on the side surface portion of the outer periphery or the side surface portion of the through-hole portion. The processing part is exposed, and due to the exposure of the unstrengthened processing part, the glass base material may be cracked by microcracks or chipping, causing the strength reduction or damage of the entire display device used. is there.
For this reason, conventionally, a protective resin is further formed on the side surface of the outer periphery of the individual glass substrate for the cover glass and the side surface of the through hole.

Under such circumstances, the glass substrate for the cover glass can be singulated and molded together, so that the glass substrate is larger than the glass substrate for the individual cover glass as a processing material. An etching processing method of forming an etching-resistant protective film on both surfaces of the glass substrate in accordance with the molding shape and etching an exposed portion of the large-sized glass substrate with an etching solution containing hydrofluoric acid. Has come to be adopted.
Conventionally, as shown in FIG. 5, the individualization by such an etching method is performed on both sides of the large-sized glass substrate 50 (50 in FIG. 5 (a)) on each target cover glass. According to the external shape, the openings of the etching resistant resin films 51 and 52 having the same shape and size are provided and pasted in an aligned state (FIG. 5 (b)). Etching was performed to penetrate the large-sized glass substrate 50 through the opening and separate into individual glass substrates for the cover glass. (Fig. 5 (c))
Here, the etching is carried out from both surfaces of the glass substrate 50 by dipping, spraying, etc., but the etching amount from both surfaces is made the same, so that the recess 55a formed by etching from one surface side and the other surface side from the other surface side. The recess 55b formed by etching has substantially the same shape and size.
In FIG. 5, the area | region for forming the glass base material for one cover glass from the said large sized glass base material is shown as D0.
After that, in order to protect the unstrengthened processing part on the side surface of the outer shape of the individual glass substrate for the individual cover glass, the side surface 55aA on the recess 55a side and the side surface 55bA on the recess 55b side are uncured. The resin 57 is coated and cured to dispose a cured protective resin. Conventionally, as a resin disposing method for disposing a cured protective resin, the following first method or The second method was adopted.
In the first method, after etching (FIG. 5 (c)), as shown in FIG. 6 (a), the surface direction of the glass substrate for the individual cover glass is set to the horizontal direction. In this method, an uncured resin is coated as it is on the side surface on the concave portion 55a side and the side surface on the concave portion 55b side with a dispenser or the like, cured, and a protective resin cured on the side surface is disposed.
As the uncured resin, a UV curable resin is used and UV cured.
In the case of this first method, although it does not take time and effort, it is necessary to select a high-viscosity material as a protective resin to be applied because it is necessary to leave a cured resin on the side surface that needs to be protected.
However, even if a high-viscosity material is selected, it tends to sag due to gravity as shown in FIGS. 6A to 6B, and it is difficult to obtain a desired shape.
In the second method, after etching (FIG. 5 (c)), as shown in FIG. 7, the portion where the uncured resin 57 is coated is set in the horizontal direction or a direction in which the resin does not drip, or the like. This is a method in which a protective resin is disposed by coating and curing.
Again, as the uncured resin 57, a UV curable resin is used and UV cured.
In the case of this second method, on the side surface to be coated by making the outer peripheral part (the side part of the outer shape) of the glass substrate for the cover glass separated into pieces to be coated in a horizontal direction or a substantially horizontal direction. It is easy to make it a flat shape or a shape close to a flat shape, but even in the case of a square shape, it is necessary to divide the outer peripheral part to be applied multiple times and repeat the application and curing operations, and the surface direction of the glass substrate is the vertical direction In this state, it is assumed that the glass substrate is rotated, and it is difficult to make it into an apparatus.

JP 2012-111688 A JP 2012-88946 A

As mentioned above, while mobile terminal devices such as mobile phones, smartphones, tablets, etc. are spreading widely, as a cover glass for the protective cover of the display part of these mobile terminal devices, strengthening with chemical strengthening treatment on the surface from the strength aspect Although processed glass is used and it is calculated | required to protect the unstrengthened part of the outer peripheral side surface of the base material for cover glasses after being separated into pieces, conventionally, as described above, the first The cured resin was disposed on the outer side surface of the glass substrate for the cover glass by each of the method and the second method to protect the unstrengthened portion on the side surface.
However, in the case of the first method, it does not take time and effort, but it is necessary to select a high-viscosity material as an uncured resin to be coated. Even if a high-viscosity material is selected, the desired shape is obtained by gravity. There is a problem that it is difficult, and in the case of the second method, it is necessary to repeat the coating and curing operations by dividing the coating part into multiple times in order to coat in the horizontal or substantially horizontal direction. There is a problem that it is difficult to make a device because it is premised on rotating the cover glass in a state where the surface direction of the cover glass is the vertical direction.
The present invention corresponds to these, and uses a tempered glass whose surface is tempered as a base material, and a protective cured resin is disposed on the outer peripheral side surface of the base material (also referred to as a glass base material). An object of the present invention is to provide a cover glass that can provide a quality, simple, and efficient arrangement of a cured resin for protection on the outer peripheral side surface of the base material (glass base material). .
At the same time, an object of the present invention is to provide a method for forming an outer peripheral side surface portion of a cover glass that can produce such a cover glass.

The cover glass according to the invention of claim 1 is a cover glass in which a tempered glass whose surface is tempered is used as a base material, and a protective cured resin is disposed on the outer peripheral side surface of the base material. In the cross-sectional shape in the direction orthogonal to the outer periphery of the base material, the side surface of the outer periphery of the base material is the side surface on the first concave side of the large concave portion formed by etching and recessed from one surface of the base material, It is characterized in that it is formed by a side surface on the side of the second concave portion having a small size formed by etching and recessed from the other surface of the base material.
In addition, the large size and the small size here mean the area | region of the 1st recessed part and the 2nd recessed part which were formed by etching, and here, in the surface direction (XY plane) of a base material, The area of the first recess having the large size includes the area of the second recess having the small size, and is larger than the area of the second recess.
And the cover glass which concerns on invention of Claim 2 is the cover glass of Claim 1, Comprising: In cross-sectional shape of the direction orthogonal to the said outer periphery, the side surface by the side of the said 1st recessed part, and the said 2nd recessed part The angle θ _t formed between the tangent line of the curve indicating the side surface on the first recess side and the one surface of the base material is 0 degree at the location where the side surface on the side intersects It is.
Here, even if the angle θ _t is not strictly 0 degrees, the surface direction of the base material is horizontal, the first concave portion side is up, and the resin is applied to the outer side surface portion even if the angle θ _t is not strictly 0 degrees. In this case, as in the case of 0 degree, the angle at which the resin can be prevented from sagging due to gravity is defined as an angle corresponding to 0 degree, and such an angle close to 0 degree is also treated as “angle θ _t is 0 degree”. .

  Further, the invention of claim 3 is a method for forming an outer peripheral side surface portion in a cover glass, and (a) a tempered glass whose surface is tempered is used as a base material and corresponds to an outer shape to be formed as an etching resistant mask. An etching resistant second resin film having an opening corresponding to the outer shape to be formed on one surface of the base is formed on the base of the etching resistant first resin film having an opening. A resin film affixing step to be affixed to the other surface of the substrate, and (b) the base material portion exposed from the opening of the resin film is etched from both sides of the base material to penetrate therethrough. An etching process for forming the outer shape of the glass substrate for the cover glass, and (c) an uncured, for protection, on the outer side surface of the glass substrate for the cover glass for which the outer shape is formed. Of resin And a step of disposing a protective resin to be cured, and (d) a resin film peeling step for peeling the resin films on both sides of the substrate, respectively, and in the resin film attaching step, In the surface direction (XY plane) of the base material, the opening of the first resin film has the same shape as the opening of the second resin film and is provided at the same position corresponding to the shape to be formed. And the opening width of the opening of the first resin film is larger than the opening width of the opening of the second resin film, and in the step of disposing the protective resin, Applying a protective resin that protects the side surface of the outer periphery from the recessed side formed by etching on the upper side in a state where the substrate is leveled with the side on which the first resin film is attached as the upper side, and curing. It is a feature.

(Function)
The cover glass of the present invention has such a structure, and the tempered glass whose surface is tempered is used as a base material, and the protective side is cured on the side surface of the outer periphery of the base material (also referred to as a glass base material). It is possible to provide a cover glass that can be provided with a good quality, easily and efficiently with a cover glass in which a resin is disposed, and a protective cured resin can be disposed on the outer peripheral side surface of the substrate.
In particular, it is suitable as a cover glass for a protective cover of a display unit of a mobile terminal device such as a mobile phone, a smartphone, or a tablet.
Specifically, it is a cover glass in which a tempered glass whose surface has been tempered is used as a base material, and a protective cured resin is disposed on the side surface of the outer periphery of the base material. In the cross-sectional shape in the direction orthogonal to the side surface, the side surface of the outer periphery of the base material is formed by etching the side surface on the first concave side of the large size recessed from the one surface of the base material and the other surface of the base material. It is possible to achieve this by forming with a side surface on the side of the second concave portion having a small size formed by etching.
According to the present invention, because of the shape of the outer peripheral side surface of the glass substrate for the cover glass, the surface direction of the base material is set to the horizontal direction, and from the upper side, the outer peripheral side surface portion is uncured by a dispenser or the like. When the resin is applied and cured to form a coating film, the first concave portion side is set to the upper side, so that it is separated into pieces by the conventional etching method shown in FIG. Compared to the case where the resin coating method shown is applied, the upper concave portion (first concave portion) becomes a larger-sized concave portion (also referred to as a large hole) than the lower concave portion (second concave portion). The uncured resin easily stays in the upper concave portion (first concave portion), and the amount of the resin flowing from the upper concave portion side to the lower concave portion side can be reduced, thereby suppressing dripping of the resin due to gravity. It is supposed to be.
The angle θ _t is preferably closer to 0 degrees from the viewpoint of suppressing the dripping of the resin due to gravity.
Thus, according to the present invention, the first concave portion side is set to the upper side, so that the side surface shape is set to the horizontal direction, and the side surface from the upper side is dispensed by a dispenser or the like from the upper side. It is possible to adopt a method of forming a resin film on the side surface, which is applied and cured.
Further, since the upper first concave portion is larger than the lower second concave portion in the above application, the base for the cover glass separated by the conventional etching shown in FIG. Compared to the case of a material, it is easier to apply a dispenser or the like.
Furthermore, when looking at the cross-sectional shape orthogonal to the outer periphery of the glass substrate for the singulated cover glass, the side surface on the first recess side and the side surface on the second recess side intersect with each other. In the case where the angle θ _t formed between the tangent line of the curve indicating the side surface on the first recess side and the one surface of the glass substrate is 0 degree, the surface direction of the glass substrate is horizontal. As the direction, from the upper side, when the UV curable uncured resin is applied and cured on the outer peripheral side surface by a dispenser or the like, dripping due to the gravity of the resin can be suppressed more effectively. By setting the concave portion side of 1 as the upper side, because of the side surface shape of the outer periphery of the glass substrate, the surface direction of the glass substrate is set as the horizontal direction, and from the upper side, the outer side surface portion is uncured by a dispenser or the like. Apply the resin and harden it. The resin film forming method on the outer peripheral side surface of the lath substrate is more easily adopted.

  The method for forming the outer peripheral side surface portion of the cover glass of the invention of claim 3 has such a configuration, and uses the tempered glass whose surface is tempered as a base material, and the base material (also referred to as a glass base material). In the production of a cover glass in which a protective cured resin is disposed on the outer peripheral side surface of the substrate, the protective cured resin is disposed on the outer peripheral side surface of the base material with high quality, simply and efficiently. It has become possible to provide a method for forming the outer peripheral side surface of the cover glass that can be improved.

As described above, according to the present invention, a tempered glass whose surface is tempered is used as a base material, and a protective cured resin is disposed on the outer peripheral side surface of the base material (also referred to as a glass base material). With the cover glass, it is possible to provide a cover glass that can easily and efficiently provide a hardened resin for protection on the outer peripheral side surface of the substrate.
Further, in the production of a cover glass in which a tempered glass whose surface is tempered is used as a base material, and a protective cured resin is disposed on the outer peripheral side surface of the base material (also referred to as a glass base material), It is possible to provide a method for forming the outer peripheral side surface portion of the cover glass that can easily and efficiently arrange the cured resin for protection on the outer peripheral side surface of the base material with high quality.

FIG. 1A is a plan view showing the appearance of the cover glass of the present invention, FIG. 1B is a cross-sectional view of the outer peripheral portion at A1-A2 in FIG. 1A, and FIG. These are sectional drawings which showed the state which deleted the resin 17 in FIG.1 (b). 2 (a) is a plan view showing the appearance of the cover glass of the present invention, FIG. 2 (b) is a cross-sectional view of the outer periphery at B1-B2 in FIG. 2 (a), and FIG. 2 (c). These are sectional drawings which showed the state which deleted the resin 27 in FIG.2 (b). FIGS. 3A to 3F are process cross-sectional views of an example of a method for forming the outer peripheral side surface portion of the cover glass of the first example shown in FIG. FIG. 4A to FIG. 4F are process cross-sectional views of an example of a method for forming the outer peripheral side surface portion of the cover glass of the second example shown in FIG. FIG. 5A to FIG. 5C are process cross-sectional views illustrating an example of a conventional method for forming an outer shape of a glass substrate for a cover glass. 6 (a) to 6 (b) are diagrams for explaining an example of a protective resin disposing method on the outer peripheral side surface of a conventional glass substrate for a cover glass and dripping of the protective resin. FIG. It is sectional drawing which showed one example of the resin arrangement | positioning for protection to the side surface of the outer periphery of the glass base material for the conventional cover glass. FIG. 8A is a cross-sectional view showing a part of a cross section in which a touch panel device using a cover glass is used for a display device, and FIG. 8B is a perspective view of an electrode portion of the touch sensor from the direction of an arrow. It is the figure which tried.

The 1st example of embodiment of the cover glass of this invention is demonstrated based on FIG.
The cover glass 1 of the first example uses a tempered glass whose surface is tempered as a base material (hereinafter also referred to as a glass base material) 10, and a protective cured resin is disposed on the outer peripheral side surface of the base material. The cover glass provided is used as a protective cover that is used by being attached to a display device such as a portable terminal device to protect the surface. As shown in FIG. Seen from the direction orthogonal to the surface direction, the through-hole part 3 having a quadrangular through-hole, the through-hole parts 2 and 2a having a round-shaped through-hole, and a concave part recessed toward the glass substrate 10 side. 4 is provided. In particular, the cover glass 1 of the first example has a cross-sectional shape in a direction perpendicular to the outer periphery 1a of the glass substrate 10 as shown in FIG. Side surface 15aA on the side of the first concave portion 15a having a large size that is recessed from one surface of the substrate 10 and the side of the second concave portion 15b having a small size that is recessed from the other surface of the glass substrate 10 Side surface 15bA.
In order to explain the shape of the side surface 15aA on the first concave portion 15a side and the shape of the side surface 25aA on the second concave portion 25a side of the glass substrate 10 in an easy-to-understand manner, FIG. 2 shows a sectional view in a state where the resin 17A is removed.
Here, the region surrounded by the dotted line and the side surface 15aA shown in FIG. 1C is the first recess 15a, and the region surrounded by the dotted line and the side surface 15bA shown in FIG. The concave portion 25b.
In the first example, as shown in FIG. 1C, in the cross-sectional shape in the direction orthogonal to the outer periphery 1a of the glass substrate 10, the side surface 15aA on the first recess 15a side and the second recess At the point 31 where the side surface 15bA intersects, the angle θ _t formed between the tangent line of the curve indicating the side surface 15aA on the first recess 15a side and the one surface (base material surface) of the glass substrate 10 is 0. Not a degree.
The angle θ _t is such that the surface direction of the glass substrate 10 is horizontal, the first concave portion 15a side is up, and a UV curable uncured resin is applied to the outer periphery 1a of the glass substrate 10 by a dispenser or the like. When it is applied to the side surface and cured, the angle is not enough to suppress dripping of the resin due to gravity, but by applying the resin with the first concave portion 15a side as the upper side, the conventional etching method shown in FIG. Compared to the case where the resin coating method shown in FIG. 6 is applied to the side surface around the cover glass that has been separated into pieces, the upper first concave portion 15a is larger than the lower second concave portion 15b. Therefore, the resin tends to stay in the upper first concave portion 15a, and the amount of the resin flowing from the upper first concave portion 15a side to the lower second concave portion 15b side can be reduced. Can suppress dripping due to gravity It is supposed to be.
The angle θ _t is preferably closer to 0 degrees from the viewpoint of suppressing dripping of uncured resin due to gravity.
Thereby, in the coating film of the resin for protection on the peripheral side surface in the glass substrate 10 for the cover glass of this example, the first concave portion 15a side is set as the upper side, so that the side surface shape is used. A resin film that forms a cured resin film by applying a UV curable uncured resin to the side surface of the outer periphery 1a of the glass substrate 10 from above with a dispenser or the like, and curing the surface direction from the upper side. It is possible to adopt a formation method.
Further, when the uncured resin is applied, the upper first concave portion 15a is larger than the lower second concave portion 15b, and therefore, compared with the side surface formed by etching shown in the conventional FIG. This makes it easy to apply dispensers and the like.

Each member will be described.
<Glass base material>
As the glass substrate 10, a tempered glass obtained by subjecting an aluminosilicate glass to a chemical tempering treatment is usually used, but is not limited thereto.
A thickness of 0.10 mm to 1.0 mm is used.
The chemical strengthening treatment is performed, for example, by replacing the alkali ions contained in the glass with other alkali ions having a larger ion radius at a temperature below the strain point, so that the ions are exchanged near the surface. It is strengthened by forming a compressive stress layer that generates a compressive stress.

<Resin for protection>
As the uncured resin 17 for forming the protective cured resin 17A, a UV curable resin having a high curing speed is preferably used from the viewpoint of application and curing.
Examples of such resins include acrylic, epoxy, and polyene-polythiol resins.
And the surface hardenability in the air atmosphere, the resin adhesion to the glass, the impact resistance (after curing), the moisture resistance, those with good light resistance are preferred, and further those with good surface printability are preferred. Enthiol-based resins are preferred.
Since the acrylic resin is radical polymerization, the surface that is in contact with oxygen is uncured due to reaction inhibition when the resin is applied and cured.
Epoxy systems have high hardness, but are inferior in terms of impact properties, and the resin is easily broken when given an impact.
A UV curable polyene-polythiol resin is preferably used, and has less curing shrinkage than acrylic photo-curing resins, so it has high adhesion to the base material and is not polymerized due to oxygen. Has the advantage of not.

Hereinafter, the polyene-polythiol resin will be described.
A resin containing an ene compound, a thiol compound and a photopolymerization initiator is referred to as a polyene-polythiol resin.
An ene compound is a polyfunctional compound having two or more carbon-carbon double bonds in one molecule. Vinyl ethers, vinyl esters, allyl ethers, allyl alcohol derivatives, allyl isocyanuric acid derivatives, styrenes , Acrylic acid derivatives, methacrylic acid derivatives, divinylbenzene and the like.
When a part of the above-mentioned ene compounds is arranged in the order of high reactivity with the thiol compound, the order becomes vinyl ethers, vinyl esters, allyl ethers, allyl isocyanuric acid derivatives, acrylic acid derivatives, and styrenes.
The thiol compound is a compound having two or more thiol groups in one molecule, and examples thereof include esters of mercaptocarboxylic acid and a polyhydric alcohol, aliphatic polythiols and aromatic polythiols, and other polythiols.
These 1 type (s) or 2 or more types can be used.
Examples of the mercaptocarboxylic acid in the ester of mercaptocarboxylic acid and polyhydric alcohol include thioglycolic acid, α-mercaptopropionic acid and β-mercaptopropionic acid.

The blend ratio of the ene compound (a) and the thiol compound (b) is such that the ratio of the number of unsaturated bonds of the ene compound (a) to the number of thiol groups of the thiol compound (b) is 2: 1 to 1: 2. A range is preferable.
When the amount of thiol groups exceeds 1: 2, a large amount of unreacted thiol groups remain in the composition after the curing reaction. It is not preferable from the viewpoint that there are few advantages such as high adhesion and no polymerization inhibition due to oxygen.

A photoinitiator is not specifically limited, A well-known photoinitiator can be used.
Specifically, for example, as a photopolymerization initiator, in the case of a resin system having a radical polymerizable unsaturated group, it is commercially available as acetophenones (for example, trade name Irgacure 184 (manufactured by Ciba Specialty Chemicals) 1 -Hydroxy-cyclohexyl-phenyl-ketone), benzophenones, thioxanthones, propiophenones, benzyls, acylphosphine oxides, benzoin, benzoin methyl ether and the like can be used alone or in combination.

It is preferable to add the said photoinitiator (c) in the ratio of 0.001-10 mass% with respect to the total amount of the said ene compound (a) and a thiol compound (b).
If it is less than 0.001% by mass, there may be a problem that the photopolymerization reaction cannot be sufficiently caused.
Moreover, even if it adds exceeding 10 mass%, the improvement of an effect is not seen.

Next, a method for forming the side surface portion of the outer periphery 1a in the cover glass 1a of the first example will be briefly described with reference to FIG.
In addition, it is set as description of one example of embodiment of the formation method of the outer peripheral side part in the cover glass of this invention by this.
First, an etching resistance having an opening 11a corresponding to the outer shape to be formed as an etching resistance mask for a large-sized glass substrate 10A made of tempered glass whose surface has been tempered, prepared in advance. The etching-resistant second resin film 12 having an opening 12a corresponding to the outer shape to be formed on one surface of the base material is formed on the other surface of the base material. , Respectively, a resin film attaching step for attaching is performed. (FIGS. 3A to 3B)
In the resin film affixing step, the opening 11a of the first resin film 11 corresponds to the shape to be formed in the surface direction (XY plane) of the glass substrate 10A. The opening width of the opening 11a of the first resin film 11 is larger than the opening width of the opening 12a of the second resin film 12; deep.
As the resin films 11 and 12, those having a structure in which an adhesive is disposed on one surface of the resin film are used in a predetermined shape with the adhesive side attached to a glass substrate.
Next, the glass substrate portions exposed from the openings 11a and 12a of the resin films 11 and 12 are etched from both surfaces of the glass substrate 10A to penetrate therethrough, and a glass substrate for one cover glass (FIG. 1). The etching process for forming the outer shape of the glass substrate 10 is performed. (Fig. 3 (c))
Here, etching is performed in the same manner from both sides by dipping, spraying, or the like from both surfaces of the glass substrate 10A using an etching solution made of a hydrofluoric acid solution, but the openings 11a and 12a of the resin films 11 and 12 on both sides. Therefore, the first etching recess 16a formed by etching from the one surface side is larger than the second etching recess 16b formed by etching from the other surface side.
Thus, the first etching recess 16a and the second etching recess 16b are provided, and the through-hole portion 16 is formed by both etching recesses.
Here, the difference between the opening 11a of the resin film 11 and the opening 12a of the resin film 12 is reduced corresponding to each through-hole portion 16 to be formed.
Thus, it penetrates, separates, and is separated into individual glass substrates for cover glass (corresponding to 10 in FIG. 1), but the side surface when separated as shown in FIG. This corresponds to the side surface around the glass substrate 10 of the cover glass of the first example shown in FIG.
The individual glass substrates for the cover glass separated into pieces correspond to the glass substrate 10 for the cover glass in FIG. 1, the side surface 15aA in FIG. 1 corresponds to the side surface 16aA in FIG. The side surface 15bA in FIG. 1 corresponds to the side surface 16bA in FIG.
Here, since the difference between the opening 11a of the resin film 11 and the opening 12a of the resin film 12 is reduced corresponding to each through-hole portion 16 to be formed, as shown in FIG. In a portion where the side surface 15aA on the side and the side surface 15bA on the second recess 15b side intersect, a tangent of a curve representing the side surface 15aA on the first recess 15a side in the cross section shown in FIG. The angle θ _t formed with the base material surface which is the surface of 10 is not 0 degree.
Next, an uncured resin 17 is applied to the outer side surface 16aA (corresponding to 15aA in FIG. 1) of the individualized glass substrate (corresponding to 10 in FIG. 1) with a dispenser or the like, cured, and cured. The protective resin 17A is disposed to dispose the protective resin 17A. (Fig. 3 (d))
The protective resin disposing step refers to a state in which the glass substrate (corresponding to 10 in FIG. 1) that has been separated with the side on which the first resin film 11 is attached as the upper side is horizontal, An uncured resin 17 is applied to the side surface 16aA (corresponding to 15aA in FIG. 1) from the side of the large-sized first recess 16a formed by etching, and is cured.
As the uncured resin, a UV curable resin having a high curing speed is preferably used from the viewpoint of applying and curing.
Examples of the UV curable resin include acrylic, epoxy, and enethiol resins, and enethiol resins are particularly preferable.
After the resin 17 is UV-cured, a resin film peeling step for peeling the resin films 11 and 12 on both surfaces of the glass substrate 10 is performed. (Fig. 3 (e))
Furthermore, if necessary, the end of the cured resin 17A is rounded so that the end of the resin has a round shape. (Fig. 3 (f))
As round processing, it processes with the grindstone which can make a round shape with respect to the side surface side of a through-hole part, for example.
The material of the resin films 11 and 12 is not particularly limited as long as the above processing can be performed.
As the resin films 11 and 12, biaxially stretched polypropylene or unstretched polypropylene having a thickness of about 50 to 100 μm can be used.
In this manner, the cover glass 1 of the first example is produced.

In addition, the cover glass which has a side part of the cross-sectional shape shown in FIG.3 (e) can also be mentioned as a modification of a 1st example.
This modified example is partly different from the first example because the shape of the cured resin 17A is not round processed, but is otherwise the same as the first example.

Next, the 2nd example of embodiment of the cover glass of this invention is demonstrated based on FIG.
Here, in order to explain the shape of the side surface 25aA on the first recess 25a side and the shape of the side surface 25bA on the second recess 25b side of the glass substrate 20 in an easy-to-understand manner, FIG. ) Shows a sectional view in a state where the resin 27A is removed.
Also in this case, the portion surrounded by the dotted line and the side surface 25aA shown in FIG. 2C is the first recess 25a, and the portion surrounded by the dotted line and the side surface 25bA shown in FIG. The concave portion 25a.
The direction of the cross section here is also a direction orthogonal to the outer periphery of the glass substrate 20 as in the first example.
The cover glass 1A of the second example also has a tempered glass whose surface is tempered as a base material (hereinafter also referred to as a glass base material) 20, and a protective cured resin is disposed on the outer peripheral side surface of the base material. The cover glass that is provided is used as a protective cover that is attached to a display device such as a portable terminal device to protect the surface, and as shown in FIG. 2A, as in the first example. As seen from the direction orthogonal to the surface direction of the cover glass 1A, the through-hole portion 3 having a square-shaped through hole, the through-hole portions 2 and 2a having a round-shaped through-hole, and a part thereof, a glass substrate A recessed recess 4 is provided on the 20 side.
Similarly to the glass substrate 10 of the first example, the glass substrate 20 for the cover glass of the second example is formed by being separated into pieces by double-sided etching from a large-sized glass substrate ( 5), the side surface of the outer periphery 1a of the glass substrate 20 includes a side surface 25aA on the side of the first concave portion 25a having a large size that is recessed from one surface of the glass substrate 20, and the other side of the glass substrate 20. And a side surface 25bA on the side of the second concave portion 25b having a small size and formed by etching.
In the second example, as shown in FIG. 2C, in the cross-sectional shape in the direction orthogonal to the periphery 1a of the glass substrate 20, the side surface 25aA on the first recess 25a side and the second recess 25b side in locations 31A of the side face 25bA of the cross, and the tangent of the curve representing the first recess 25a side surface 25aA, the angle theta _t formed between the one surface of the glass substrate 20 and 0 degrees.
In the second example, the angle θ _t is 0 degree, and the surface direction of the glass substrate 20 is horizontal compared to the case of the first example in which the angle θ _t is not 0 degree, and the first recess 25a side. When a UV curable uncured resin is applied to the side surface 25aA by a dispenser or the like and cured, the sagging due to the gravity of the resin can be further suppressed.
The length of the sides of the angle theta _t is 0 degrees, the uncured but preferably longer from the suppressing surface sag due to gravity of the resin, the first recess 25a side of the upper second lower It is necessary not to hinder the flow of resin toward the concave portion 25b.
Of course, in the case of the second example as well, as in the case of the first example, an uncured resin is applied with the first concave portion 25a having a large size as the upper side, and the individual etching is performed by the conventional etching method shown in FIG. Compared to the case where the resin coating method shown in FIG. 6 is applied to the side surface around the cover glass that has been singulated, the size is larger than that of the second concave portion 25b below the upper first concave portion 25a. Therefore, the resin tends to stay in the upper first concave portion 25a, and the amount of the resin flowing from the upper first concave portion 25a side to the lower second concave portion 25b side can be reduced. Sagging can be suppressed.

As for the production of the cover glass of the second example, as shown in FIGS. 4A to 4F, basically, the same steps as the production of the cover glass of the first example are taken. In order to make the angle θ _t 0 degree in the side surface shape of the outer periphery formed on the glass substrate for the cover glass (corresponding to 20 in FIG. 2), in the production of the second example, a large size glass is used. The difference in size of the opening of the resin film to be attached to both surfaces of the base material 20A is made larger than in the case of the production of the first example.
In the etching step, the same etching is performed from both sides by dipping, spraying or the like from both sides of the glass substrate 20A.
Other than that, it is basically the same as the production of the first example, and the explanation is omitted here.
In the second example, even if the angle θ _t is not strictly 0 degree, the surface direction of the glass substrate 20 is horizontal, the first concave portion 25a side is the top, and the angle θ _t is not 0 degree. When the cured resin is applied to the side surface, as in the case of 0 degrees, the angle at which dripping due to the gravity of the resin can be suppressed is defined as an angle corresponding to 0 degrees. Treated as “ _t is 0 degree”.

In addition, the cover glass which has the side surface of the cross-sectional shape shown in FIG.4 (e) can also be mentioned as a modification of a 2nd example.
Since this modified example is not rounded, the shape of the cured resin 27A is partially different from the second example, but is otherwise the same as the second example.

Embodiments of the cover glass of the present invention are not limited to the first example, the modified example of the first example, the second example, and the modified example of the second example.
For example, the form which formed the decoration part which is the area | region which gave decoration by the printing method, the photolitho method, etc. on the one surface side of the said cover glass is also mentioned.
Further, the resin (corresponding to 17A in FIG. 1 or 27A in FIG. 2) may contain a color pigment having the same color as that of the color pigment contained in the decorative portion.
In the first example, a modification of the first example, in the upper side shown in FIG. 1 (e), the W1 width is a region where the decorative portion cannot be formed, but is included in the decorative portion in the resin 17A. In the case where the same color pigment as that of the colored pigment is included, this region can be made to be the same as the decorative portion in appearance.
Similarly, in the second example and the modified example of the second example, in the upper side shown in FIG. 2 (e), the W2 width is a region where the decoration portion cannot be formed, but the resin 27A is decorated. When a color pigment having the same color as the color pigment contained in the part is included, this region can be made to be the same as the decorative part in appearance.
Moreover, as a cover glass of this invention, external shape is not limited to the said 1st example or a 2nd example.
Also, the size is not limited.

DESCRIPTION OF SYMBOLS 1, 1A Cover glass 1a Perimeter 2, 2a Through-hole part 3 Through-hole part 4 Recessed part 10 Glass base material (it is also only called a base material)
10A (large size) glass substrate 10a Unreinforced processing portion 10b Strengthening processing portion 10S Direction parallel to glass substrate surface 11 Resin film 11a Opening 12 Resin film 12a Opening 15 Through hole 15a First recess (large size) Recess)
15aS Tangent direction 15b Second recess (small size recess)
15aA Side surface 15bA Side surface 16 Through-hole portion 16a First etching recess (large size etching portion)
16b Second etching recess (small size etching part)
16aA Side 16bA Side 17 Resin 17A (for protection before curing) Resin 20 (for protection after curing) Glass substrate (also simply referred to as substrate)
20A (large size) glass substrate 20a Unstrengthened processing section 20b Reinforced processing section 21 Resin film 21a Opening 22 Resin film 22a Opening 25 Through hole 25a First recess (large size recess)
25b Second recess (small size recess)
25aA Side surface 25bA Side surface 26 Through-hole portion 26a First etching recess (large size etching portion)
26b Second etching recess (small size etching part)
26aA Side 26bA Side 27 Resin 27A (for protection before curing) Resin 27A (for protection after curing) 50 Glass substrate (also referred to as unit substrate)
50a Unstrengthened processing part 50b Reinforced processing part 51 Resin film 51a Opening 52 Resin film 52a Opening 55 Through-hole part 55a Recessed part 55b Recessed part 55aA Side face part 56 Resin film 57 (for protection before hardening) Resin 57A (for protection after hardening) Resin) 110 display device 120 touch panel (touch panel device)
130 touch sensor 131 base film 132 first electrode part (X electrode part)
132a Conductor layer 132b Conductor layer 133 Second electrode part (Y electrode part)
133a Conductor layer 133b Conductor layer 140 Protective cover (cover glass)
151 Adhesive layer (insulating layer)
152 Adhesive layer (insulating layer)

Claims (3)

A cover glass in which a tempered glass having a tempered surface is used as a base material, and a protective cured resin is disposed on the outer peripheral side surface of the base material, in a direction perpendicular to the outer periphery of the base material In the cross-sectional shape, the side surface of the outer periphery of the base material is formed by etching that is recessed from one surface of the base material, the side surface on the first concave side of the large size formed by etching, and that is recessed from the other surface of the base material. A cover glass, characterized in that the cover glass is formed of a small-sized second recess-side surface. 2. The cover glass according to claim 1, wherein, in a cross-sectional shape in a direction orthogonal to the outer periphery, the first concave portion side surface and the second concave portion side surface intersect with each other. The cover glass is characterized in that an angle θ _t formed between a tangent of a curve indicating a side surface of the concave portion and the one surface of the substrate is 0 degree. A method for forming an outer peripheral side surface of a cover glass, wherein (a) a tempered glass whose surface is tempered is used as a base material, and an etching resistant mask having an opening corresponding to the outer shape to be formed An etching-resistant second resin film having an opening corresponding to the outer shape to be formed is attached to one surface of the base material on the other surface of the base material, respectively. A step of attaching a resin film, and (b) etching the substrate portion exposed from the opening of the resin film from both sides of the substrate so as to penetrate the outer shape of the glass substrate for one cover glass. An etching process for forming a shape, and (c) protection for applying and curing an uncured resin on the outer side surface of the glass substrate for the cover glass for which the outer shape is formed. For An oil disposing step, and (d) a resin film peeling step for peeling the resin films on both sides of the base material, respectively. In the resin film attaching step, the surface direction of the base material ( Corresponding to the shape to be formed, the opening of the first resin film has the same shape as the opening of the second resin film, and is provided at the same position. The opening width of the opening of the resin film is larger than the opening width of the opening of the second resin film, and the first resin film of the base material is attached in the protective resin disposing step. The outer periphery of the cover glass is characterized by applying and curing a protective resin that protects the side surface of the outer periphery from the recessed side formed by etching on the upper side in a state where the base is horizontal with the attached side as the upper side. Method for forming side surface

Images