JP2016102050A - Cover glass, display device with cover glass, and production method of cover glass - Google Patents

Abstract

Provided is a cover glass configured such that a unit base material and a reinforcing part can be visually recognized as being integral with each other. A first surface 22a (31) on the viewer side, a second surface 22b (32) opposite to the first surface 31, and a side surface 22c extending between the first surface 22a and the second surface 22b are provided. A cover glass 20 including a unit base material 22 made of glass and a reinforcing portion 30 provided on a side surface 22c of the unit base material 22 and including a resin material. The side surface 22c of the unit base material 22 intersects with the first surface 22a of the unit base material 22, and the first side surface 22d spreads outward with respect to the unit base material 22 toward the second surface 22b side of the unit base material 22. A second side surface 22e that intersects with the second surface 22b of the unit base material, expands outward with respect to the unit base material 22 toward the first surface side 22a of the unit base material 22, and merges with the first side surface 22d; , Including. The resin material of the reinforcing portion 30 is a cover glass 20 having a light shielding property. [Selection] Figure 3

Description

  The present invention relates to a cover glass provided on the viewer side of a display device and a method for manufacturing the same. The present invention also relates to a display device with a cover glass.

  Conventionally, it is known to provide a cover glass for protecting the display surface of a display device on the viewer side of a display device such as a liquid crystal display or an organic EL display. When the touch panel function is mounted on the display device, the cover glass also serves to protect the display device and a touch panel sensor provided on the viewer side of the display device. Note that a cover glass and a touch panel sensor are integrally formed.

  In recent years, mobile terminals with display devices such as smartphones and tablet PCs have been widely used. In a portable terminal, durability against a drop impact generated in a use environment is required. Therefore, the cover glass that protects the display device is required to have a high strength that can withstand a frequently occurring impact. Under such a background, for example, Patent Document 1 proposes that a cover glass is configured using a tempered glass having a compressive stress layer on which a compressive stress is generated.

  In patent document 1, the cover glass which has a dimension corresponding to the dimension of each display apparatus is produced by dividing | segmenting large tempered glass into pieces. By the way, the compressive stress layer of tempered glass is formed on the glass surface by chemical treatment or heat treatment. Therefore, when a large tempered glass is divided as in Patent Document 1, a tensile stress layer in which a tensile stress is generated is exposed on the side surface of the obtained cover glass. For this reason, it is considered that a cover glass having sufficient strength on the side surface cannot be manufactured by the method described in Patent Document 1.

  On the other hand, a technique has been proposed in which the strength of the side surface of the cover glass is increased by providing resin on the side surface of the cover glass. For example, Patent Document 2 proposes that the outer peripheral surface of the cover glass including the side surface of the cover glass is bordered by a plastic film. As the edging method, an injection molding method, a dispensing method, a spray coating method, a roller coating method, and the like have been proposed.

JP 2012-88946 A JP 2012-111688 A

  Depending on how the cover glass is attached to the display device, the resin reinforcing portion provided on the side surface of the cover glass may be visible to the user. In this case, design beauty is required not only for the cover glass but also for the reinforcing portion. For example, it is preferable that the cover glass and the reinforcing portion are visually recognized as an integral unit. On the other hand, it is difficult to realize such a sense of unity simply by bordering the outer peripheral surface of the cover glass including the side surface of the glass with a plastic film.

  An object of this invention is to provide the cover glass which can solve such a subject effectively.

  1st this invention is the cover glass provided in the observer side of a display apparatus, Comprising: The 1st surface by the side of an observer, the 2nd surface on the opposite side to the said 1st surface, and the said 1st surface and the said 1st A unit base material made of glass, including a side surface extending between two sides, and a reinforcing part provided on a side surface of the unit base material and containing a resin material, wherein the reinforcing part includes the unit base material A first surface extending laterally from an end of the first surface, a second surface extending laterally from an end of the second surface of the unit base material, and the first surface of the reinforcing portion and the first surface A tip portion extending between the unit base material and the side surface of the unit base material intersects the first surface of the unit base material and moves toward the second surface side of the unit base material. A first side surface extending outward with respect to the substrate and the second surface of the unit substrate, and the unit substrate Spread outward with respect to the unit base toward the surface side, and wherein the second side surface merging into said first side surface, a resin material of said reinforcing portion has a light-shielding property, a cover glass.

2nd this invention is the cover glass provided in the observer side of a display apparatus, Comprising: The 1st surface by the side of an observer, the 2nd surface on the opposite side to the said 1st surface, and the said 1st surface and the said 1st A unit base material made of glass, including a side surface extending between two sides, and a reinforcing part provided on a side surface of the unit base material and containing a resin material, wherein the reinforcing part includes the unit base material A first surface extending laterally from an end of the first surface, a second surface extending laterally from an end of the second surface of the unit base material, and the first surface of the reinforcing portion and the first surface A tip portion extending between the unit base material and the side surface of the unit base material intersects the first surface of the unit base material and moves toward the second surface side of the unit base material. A first side surface extending outward with respect to the substrate and the second surface of the unit substrate, and the unit substrate Spread outward with respect to the unit base toward the surface side, and wherein the second side surface merging into said first side surface, wherein the reinforcing portion has a light-shielding property, a cover glass.
In the cover glass according to the first invention or the second invention, the first side surface of the unit base material may include a flat inclined surface inclined with respect to the first surface. Alternatively, the first side surface of the unit base material may include a curved surface that is curved so as to protrude inward with respect to the unit base material.

  In the cover glass according to the first invention or the second invention, the first side surface and the second side surface of the unit base material may merge at a position closer to the second surface of the unit base material. .

  In the cover glass according to the first invention or the second invention, a step between the first surface of the unit base and the first surface of the reinforcing portion may be 10 μm or less.

3rd this invention is the cover glass provided in the observer side of a display apparatus, Comprising: The 1st surface by the side of an observer, the 2nd surface on the opposite side to the said 1st surface, and the said 1st surface and the said 1st A unit base material made of glass, including a side surface extending between two sides, and a reinforcing part provided on a side surface of the unit base material and containing a resin material, wherein the reinforcing part includes the unit base material A first surface extending laterally from an end of the first surface, a second surface extending laterally from an end of the second surface of the unit base material, and the first surface of the reinforcing portion and the first surface A tip portion extending between the unit base material and the side surface of the unit base material intersects the first surface of the unit base material and moves toward the second surface side of the unit base material. A first side surface extending outward with respect to the substrate and the second surface of the unit substrate, and the unit substrate Spread outward with respect to the unit base toward the surface side, and wherein the second side surface merging into said first side surface,
(1) The first side surface includes a curved surface that is curved so as to protrude inward with respect to the unit base material, and the refractive index of the resin material of the reinforcing portion is N1, and constitutes the unit base material. When the refractive index of the glass is N2, N1 ≦ N2 is satisfied, or
(2) M1 is the shortest distance in the direction along the surface direction of the unit base material from the end of the first surface of the unit base material to the position where the first side surface and the second side surface meet. When the dimension of the first side surface in the thickness direction of the unit base material is M2, M1 / M2 ≧ 3, the refractive index of the resin material of the reinforcing portion is N1, and the unit base material is When the refractive index of the glass to be configured is N2, it is a cover glass in which N1 ≦ N2 + 0.02 is established.
In the cover glass according to the third aspect of the present invention, the reinforcing portion may have a light shielding property.

  In the cover glass according to the third aspect of the present invention, the first side surface and the second side surface of the unit base material may merge at a position near the second surface of the unit base material.

  In the cover glass according to the third aspect of the present invention, the step between the first surface of the unit base material and the first surface of the reinforcing portion may be 10 μm or less.

4th this invention is the cover glass provided in the observer side of a display apparatus, Comprising: The 1st surface by the side of an observer, the 2nd surface on the opposite side to the said 1st surface, and the said 1st surface and the said 1st A unit base material made of glass, including a side surface extending between two sides, and a reinforcing part provided on a side surface of the unit base material and containing a resin material, wherein the reinforcing part includes the unit base material A first surface extending laterally from an end of the first surface, a second surface extending laterally from an end of the second surface of the unit base material, and the first surface of the reinforcing portion and the first surface A tip portion extending between the unit base material and the side surface of the unit base material intersects the first surface of the unit base material and moves toward the second surface side of the unit base material. A first side surface extending outward with respect to the substrate and the second surface of the unit substrate, and the unit substrate And a second side surface that spreads outward with respect to the unit base material as it goes to the surface side, and merges with the first side surface, and the first side surface is convex inward with respect to the unit base material. The cover glass is overlapped with a joining position where the first side surface and the second side surface of the unit base material join together when viewed along the surface direction of the unit base material. The cover glass further includes a light shielding layer provided on the tip of the reinforcing portion.
5th invention is the cover glass provided in the observer side of a display apparatus, Comprising: The 1st surface by the side of an observer, the 2nd surface on the opposite side to the said 1st surface, and the said 1st surface and the said 2nd A unit base material made of glass, and a reinforcing part that is provided on the side surface of the unit base material and includes a resin material, and the reinforcing part is formed of the unit base material. A first surface extending laterally from an end of the first surface; a second surface extending laterally from an end of the second surface of the unit base; and the first surface and the first of the reinforcing portion. A front end portion extending between two unit surfaces, the side surface of the unit base material intersects the first surface of the unit base material, and the unit base as it goes to the second surface side of the unit base material The first side surface of the unit base material intersects the first side surface extending outward with respect to the material and the second surface of the unit base material. And a second side surface that spreads outward with respect to the unit base as it goes to the side, and merges with the first side, and the first side is convex inward with respect to the unit base. The reinforcing portion is a cover glass that includes a curved surface and has a light shielding property.

  In the cover glass according to the fourth invention or the fifth invention, the first side surface and the second side surface of the unit base material may merge at a position near the second surface of the unit base material. .

  In the cover glass according to the fourth invention or the fifth invention, when the refractive index of the resin material of the reinforcing portion is N1, and the refractive index of the glass constituting the unit base material is N2, the light shielding layer Is an incident angle of light incident on the first side surface along the surface direction of the unit base material among the first side surfaces of the unit base material when viewed along the surface direction of the unit base material. You may provide on the front-end | tip part of the said reinforcement part so that it may at least overlap with the part which exists in the range of arcsin (N2 / N1) -pi / 2.

  In the cover glass according to the fourth invention or the fifth invention, a step between the first surface of the unit base and the first surface of the reinforcing portion may be 10 μm or less.

  6th this invention is a display apparatus with a cover glass provided with a display apparatus and the cover glass provided in the observer side of the said display apparatus, and the said cover glass consists of a cover glass of the said description.

  7th this invention is equipped with the display apparatus, the cover glass provided in the observer side of the said display apparatus, and the housing | casing holding the said display apparatus and the said cover glass, The said cover glass is an observer. A unit base material made of glass, including a first surface on the side, a second surface on the display device side, and a side surface extending between the first surface and the second surface, and a side surface of the unit base material A reinforcing portion including a resin material, wherein the reinforcing portion includes a first surface extending laterally from an end portion of the first surface of the unit base material, and a second surface of the unit base material. A second surface extending laterally from the end portion, and a tip portion extending between the first surface and the second surface of the reinforcing portion, and the side surface of the unit base material is While intersecting the first surface, and toward the unit substrate toward the second surface side of the unit substrate A first side surface extending to the side and the second surface of the unit base material, and extending outward with respect to the unit base material toward the first surface side of the unit base material, and the first side surface The first side surface includes a curved surface curved so as to be convex inward with respect to the unit base material, and the housing is arranged in a surface direction of the unit base material. It is a display apparatus with a cover glass including a light-shielding portion that overlaps with a joining position where the first side surface and the second side surface of the unit base material meet when viewed along.

  The eighth aspect of the present invention is a cover glass provided on the viewer side of the display device, wherein the viewer has a first surface, a second surface opposite to the first surface, and the first surface and the first surface. A unit base material made of glass, including a side surface extending between two sides, and a reinforcing part provided on a side surface of the unit base material and containing a resin material, wherein the reinforcing part includes the unit base material A first surface extending laterally from an end of the first surface, a second surface extending laterally from an end of the second surface of the unit base material, and the first surface of the reinforcing portion and the first surface The display device includes an active area that can display an image, and an inactive area that is disposed outside the active area so as to surround the active area. Including the display panel, the table of the first surface of the unit substrate The portion corresponding to the inactive area of the panel is inclined toward the second surface side of the unit base material with respect to the portion of the first surface of the unit base material corresponding to the active area of the display panel. The inclined surface is at least partially formed, and the first surface of the reinforcing portion is formed with an inclined surface that extends on the same plane as the inclined surface of the first surface of the unit base member. It is a cover glass.

  In the cover glass according to the eighth aspect of the present invention, the step between the inclined surface of the first surface of the unit base and the inclined surface of the first surface of the reinforcing portion may be 2 μm or less.

  In the cover glass according to the eighth aspect of the present invention, the unit base material includes at least the compressive stress layer formed on the first surface and the second surface, the compressive stress layer on the first surface side, and the second surface. A tensile stress layer positioned between the compression stress layer on the side, and the inclined surface of the first surface of the unit base material is configured such that the tensile stress layer is not exposed to the inclined surface. It may be.

  A ninth aspect of the present invention is a method for manufacturing a cover glass provided on the viewer side of the display device, the first surface on the viewer side, the second surface opposite to the first surface, and the first surface. And a step of preparing a unit base material made of glass, including a side surface extending between the second surface and a reinforcing part forming step of forming a reinforcing part containing a resin material on the side surface of the unit base material, A polishing step of polishing the first surface of the unit base material and the reinforcing portion, and the reinforcing portion after the polishing step is a side from an end portion of the first surface of the unit base material. A first surface extending in the direction, a second surface extending laterally from an end portion of the second surface of the unit base material, and a tip portion extending between the first surface and the second surface of the reinforcing portion The display device includes an active area capable of displaying video and the active area. A non-active area disposed outside the active area, and the non-active area of the display panel of the first surface of the unit substrate after the polishing step. In the corresponding portion, an inclined surface inclined toward the second surface side of the unit base material with respect to a portion corresponding to the active area of the display panel in the first surface of the unit base material is at least partially. And the polishing step is carried out so as to form an inclined surface extending on the same plane as the inclined surface of the first surface of the unit base material on the first surface of the reinforcing portion. This is a method for producing a cover glass.

  In the cover glass manufacturing method according to the ninth aspect of the present invention, the preparation step includes a step of preparing a substrate including a first surface and a second surface opposite to the first surface, and the first of the substrate. A protective film forming step of providing a first protective film and a second protective film in a predetermined plurality of partitions on the surface and the second surface; and the first protective film and the second protective film provided in each partition A cutting step of obtaining a unit laminated body by cutting the base material along a gap, wherein the unit laminated body includes a first surface, a second surface opposite to the first surface, and the first surface. A unit base material made of glass, the first protective film provided on the first surface of the unit base material, and the second surface. A cutting step having the second protective film, and the reinforcing portion forming step includes: A coating step of applying a coating liquid containing a resin material on the side surface of the base substrate, and a curing step of curing the coating solution on the side surface of the unit base material to form a reinforcing portion on the side surface of the unit base material The cutting step includes wet etching the base material from the first surface side and the second surface side of the base material using the first protective film and the second protective film as a resist. A step of cutting the base material. As a result, the first protective film protrudes laterally from the first surface of the unit base material, and the second protective film is formed of the unit base material. In the coating step, the coating liquid may be applied to a side surface of the unit base material, a space surrounded by the first protective film and the second protective film. Good.

According to the present invention, there is provided a cover glass comprising a unit base material made of glass and a reinforcing portion provided on a side surface of the unit base material and containing a resin material, wherein the unit base material and the reinforcing portion are integrated with each other. It is possible to provide a cover glass configured to be visually recognized as an object.
Further, since the reinforcing portion has a light shielding property, it is possible to reliably prevent light collection due to refraction or reflection.

FIG. 1 is a developed view showing a display device with a cover glass in the first embodiment of the present invention. FIG. 2 is a plan view showing the cover glass of FIG. 1. FIG. 3 is a cross-sectional view of the cover glass of FIG. 2 along the line III. FIG. 4 is an enlarged cross-sectional view illustrating a side surface of the cover glass of FIG. 3. FIG. 5 is a diagram for explaining a problem that may occur when light enters the cover glass from the side. FIG. 6 is a diagram illustrating a case where light enters the cover glass according to the first embodiment from the side. FIG. 7 is a view for explaining a method of measuring an average transmittance of a test piece made of a resin material of a reinforcing part of a cover glass according to the first embodiment. FIG. 8 is a cross-sectional view illustrating an example in which the cover glass further includes a decorative portion. FIG. 9 is a cross-sectional view illustrating an example in which the cover glass further includes a touch panel sensor unit. FIG. 10 is a diagram showing a base material made of large-sized tempered glass that is a base material of a unit base material. FIGS. 11A and 11B are views showing a protective film forming step for forming a protective film on the substrate shown in FIG. FIGS. 12A and 12B are diagrams showing a cutting step of cutting the base material by wet etching the base material shown in FIGS. 11A and 11B. FIG. 13 is a cross-sectional view illustrating a state in which a coating liquid is applied on the side surface of the unit base material illustrated in FIGS. FIG. 14 is a diagram showing a state in which a portion of the coating solution shown in FIG. 13 that has overflowed outside the end face of the protective film is scraped. FIGS. 15A and 15B are diagrams showing a protective film forming step of forming a protective film on a base material in the first modification of the first embodiment. FIG. 16 is a cross-sectional view showing a unit base material obtained by cutting the base material shown in FIGS. 15A and 15B by wet etching. FIG. 17 is a diagram illustrating a coating process in which a coating liquid is coated on the side surface of the unit base material illustrated in FIG. 16. FIG. 18 is a cross-sectional view showing a cover glass in a first modification of the first embodiment. FIG. 19 is a cross-sectional view showing a cover glass in a second modification of the first embodiment. FIG. 20 is a cross-sectional view showing a cover glass in the second embodiment of the present invention. FIG. 21 is a cross-sectional view showing a cover glass in a first modification of the second embodiment of the present invention. FIG. 22 is a cross-sectional view showing a cover glass in a second modification of the second embodiment of the present invention. FIG. 23 is a cross-sectional view showing a cover glass in the third embodiment of the present invention. FIG. 24 is a cross-sectional view showing a cover glass in a first modification of the third embodiment of the present invention. FIG. 25 is a cross-sectional view showing a cover glass in a second modification of the third embodiment of the present invention. FIG. 26 is a cross-sectional view showing a display device with a cover glass in a third modification of the third embodiment of the present invention. FIG. 27 is a diagram for explaining a problem in the fourth embodiment of the present invention. FIG. 28 is a cross-sectional view showing a cover glass in the fourth embodiment of the present invention. FIGS. 29 (a) and 29 (b) are views showing an example of a polishing process in the fourth embodiment of the present invention. FIG. 30 is a cross-sectional view showing a cover glass in a first modification of the fourth embodiment of the present invention. FIG. 31 is a cross-sectional view showing a cover glass in a second modification of the fourth embodiment of the present invention. FIG. 32 is a cross-sectional view showing an example of a cover glass before the polishing process is performed.

First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale, the vertical / horizontal dimension ratio, and the like are appropriately changed and exaggerated from those of the actual ones.

(Display device with cover glass)
First, the display device 10 with a cover glass will be described with reference to FIG. As shown in FIG. 1, the display device 10 with a cover glass is configured by combining a display device 15 and a cover glass 20. The illustrated display device 15 is configured as a flat panel display. The display device 15 includes a display panel 16 having a display surface 16 a and a display control unit (not shown) connected to the display panel 16. The display panel 16 includes an active area A1 that can display an image, and an inactive area (also referred to as a frame area) A2 that is disposed outside the active area A1 so as to surround the active area A1. . The display control unit processes information regarding the video to be displayed, and drives the display panel 16 based on the video information. The display panel 16 displays a predetermined image on the display surface 16a based on a control signal from the display control unit. That is, the display device 15 plays a role as an output device that outputs information such as characters and drawings as video.

  As shown in FIG. 1, the cover glass 20 is disposed on the display surface 16 a of the display panel 16 on the viewer side of the display device 15. For example, the cover glass 20 is bonded to the display surface 16a of the display device 15 via an adhesive layer (not shown). In FIG. 1, the surface (first surface) on the observer side of the cover glass 20 is represented by reference numeral 20a, and the surface (second surface) on the display device side is represented by reference numeral 20b. The first surface 20a of the cover glass 20 corresponds to the active area A1 and the inactive area A2 of the display panel 16, and an active area Aa1 through which image light is transmitted, and an inactive area Aa2 positioned around the active area Aa1 It is divided into,.

(cover glass)
Next, the cover glass 20 will be described. FIG. 2 is a plan view showing the cover glass 20 of FIG. As shown in FIG. 2, the cover glass 20 includes a rectangular unit base material 22 having four corners and a reinforcing portion 30 provided on a side surface 22 c of the unit base material 22 in plan view. As will be described later, the unit base material 22 is made of glass. The reinforcing portion 30 is provided to protect the side surface 22 c of the unit base material 22. In the example shown in FIG. 2, the reinforcing portion 30 is provided so as to surround the side surface 22 c of the unit base material 22 in a plan view. In addition, the reinforcement part 30 may be provided only in the part which is easy to damage among the side surfaces 22c of the unit base material 22. FIG. For example, although not shown, the reinforcing portions 30 may be provided only at the four corners of the unit base material 22. 2 shows an example in which the four corners of the unit base material 22 are sharply pointed. However, the present invention is not limited to this, and the four corners of the unit base material 22 may be chamfered. . For example, the four corners of the unit base material 22 may be square surfaces or round surfaces.

(Reinforcement part)
Next, the reinforcing portion 30 will be described in detail with reference to FIG. FIG. 3 is a cross-sectional view taken along line III of the cover glass 20 shown in FIG. As the line III, a line extending in parallel with one side, here, a short side of the unit base material 22 having a rectangular shape is adopted. As shown in FIG. 3, the unit base material 22 includes a first surface 22a on the observer side, a second surface 22b on the side opposite to the first surface 22a, that is, a second surface 22b on the display device side, and a first surface 22a and a second surface. A side surface 22c extending between the surface 22b and the surface 22b is included.

  As will be described later, the unit base material 22 is obtained by cutting a base material 40 made of large tempered glass and dividing it into individual pieces. As shown in FIG. 3, the unit base material 22 includes a compressive stress layer 24a formed on the first surface 22a and the second surface 22b, a compressive stress layer 24a on the first surface 22a side, and a second surface 22b side. And a tensile stress layer 24b located between the compressive stress layer 24a. The compressive stress layer 24a is a layer in which compressive stress is generated, and the tensile stress layer 24b is a layer in which tensile stress is generated. As a method for generating the compressive stress layer 24a and the tensile stress layer 24b, physical strengthening (wind cooling strengthening) and chemical strengthening are known. For example, in chemical strengthening, a chemical treatment is performed in which alkali ions contained in glass are exchanged with other alkali ions having a larger ionic radius at a temperature below the strain point. Thereby, compressive stress can be generated near the surface layer where the ions are exchanged. By forming the compressive stress layer 24a, some kind of impact is applied to the first surface 22a or the second surface 22b, and thereby a scratch such as a crack is formed on the first surface 22a or the second surface 22b. Even can prevent the wound from expanding. For this reason, the 1st surface 22a and the 2nd surface 22b of the unit base material 22 have the high tolerance with respect to an impact. As a material constituting the unit base member 22, for example, aluminosilicate glass can be used. The thickness of the compressive stress layer 24a is generally in the range of 10 to 100 μm.

  On the other hand, as shown in FIG. 3, the tensile stress layer 24 b of the unit base material 22 reaches the side surface 22 c of the unit base material 22. That is, the tensile stress layer 24 b is exposed on the side surface 22 c of the unit base material 22. For this reason, the side surface 22c of the unit base material 22 is weak against damage such as cracks, compared to the first surface 22a and the second surface 22b of the unit base material 22. The reinforcing portion 30 described above is provided to protect the side surface 22c of the unit base material 22 as described above.

As the material constituting the reinforcing portion 30, for example, a curable resin that is cured by heating or ultraviolet irradiation is used. In this case, the reinforcing part 30 has a desired fluidity at the time of molding before curing, and the reinforcing part 30 has a desired hardness and strength after curing. This makes it possible to achieve both formability, hardness and strength.
When the reinforcement part 30 is comprised from curable resin hardened | cured by ultraviolet irradiation, the combination of an acrylic resin and a photoinitiator can be used as a material which comprises the reinforcement part 30, for example. A polyene-polythiol-based photocurable resin can also be used. The polyene-polythiol-based photocurable resin is a polyene-polythiol-based resin configured so that a polymerization reaction proceeds due to light irradiation. When the reinforcement part 30 is comprised from curable resin hardened | cured by heating, an epoxy resin can be used as a material which comprises the reinforcement part 30, for example.

  Next, the shape of the side surface 22c of the unit base member 22 and the reinforcing portion 30 will be described in more detail. 4 is an enlarged cross-sectional view of the side surface 20c of the cover glass 20 of FIG.

  First, the shape of the reinforcing portion 30 will be described. The reinforcing portion 30 is the same as the first surface 22a of the unit base member 22 and the second surface 22b of the unit base member 22 on the same plane as the first surface 22a of the unit base member 22 and extends laterally from the vicinity of the end 22ae of the first surface 22a. Including a second surface 32 extending laterally from the vicinity of the end portion 22be of the second surface 22b on the plane, and a distal end portion 33 extending between the first surface 31 and the second surface 32 of the reinforcing portion 30. Yes. Hereinafter, the advantages brought about by the reinforcing portion 30 including the first surface 31 and the second surface 32 will be described.

  First, for comparison, problems considered in the above-mentioned Patent Document 2 will be described. When providing a reinforcing portion that reinforces the side surface of the base material by trimming the outer peripheral surface of the base material as in Patent Document 2, a step is formed between the surface of the reinforcing portion and the surface of the base material. . Therefore, light is likely to be scattered at the boundary between the reinforcing portion and the base material, and the light transmittance and reflectance are likely to change greatly. As a result, the boundary between the reinforcing portion and the base material is easily visually recognized by the observer. That is, it is conceivable that the design properties of the cover glass deteriorate. Moreover, when the reinforcement part of a cover glass is exposed outside, the operation feeling of a touch panel will be inhibited by the level | step difference.

  On the other hand, according to this Embodiment, the 1st surface 22a of the unit base material 22 and the 1st surface 31 of the reinforcement part 30 are located on the same plane. Similarly, the 2nd surface 22b of the unit base material 22 and the 2nd surface 32 of the reinforcement part 30 are located on the same plane. That is, there is no or almost no step between the unit base member 22 and the reinforcing portion 30. Specifically, the steps between the first surface 22a and the second surface 22b of the unit base member 22 and the first surface 31 and the second surface 32 of the reinforcing portion 30 are each 10 μm or less. For this reason, it can suppress that the boundary between the unit base material 22 and the reinforcement part 30 is visually recognized by an observer. Therefore, according to the reinforcement part 30 of this Embodiment, ensuring of the intensity | strength of the side surface 20c of the cover glass 20 and ensuring of the design property of the cover glass 20 can be made to make compatible. In addition, the operational feeling of the touch panel is not hindered by the steps. As described above, the thickness of the compressive stress layer 24a is generally in the range of 10 to 100 μm. Accordingly, when the step between the first surface 22a and the second surface 22b of the unit base member 22 and the first surface 31 and the second surface 32 of the reinforcing portion 30 is 10 μm or less, that is, the step is the compressive stress layer 24a. When the thickness is smaller than the thickness, the compressive stress layer 24a of the unit base material 22 and the reinforcing portion 30 overlap at least partially on the side surface 22c of the unit base material 22. Therefore, the tensile stress layer 24 b exposed on the side surface 22 c of the unit base material 22 can be covered with the reinforcing portion 30 without a gap. For this reason, the impact resistance of the cover glass 20 can be increased more reliably.

  Preferably, the first surface 31 and the second surface 32 of the reinforcing portion 30 are respectively on the same plane as the first surface 22a and the second surface 22b of the unit base member 22 and from the end portion 22ae and the end portion 22be over at least 300 μm. It extends toward. Thereby, the intensity | strength of the side surface 20c of the cover glass 20, and the designability of the cover glass 20 can be ensured more reliably. Note that “on the same plane” extends from the end 22ae and the end 22be to the side over at least 300 μm of the first surface 31 and the second surface 32 of the reinforcing portion 30 as in the case of the above-described step. This means that the distance in the thickness direction of the unit base material 22 between the portion and the first surface 22a and the second surface 22b of the unit base material 22 is 10 μm or less.

  Next, the tip part 33 of the reinforcing part 30 will be described. In FIG. 4, the end portion of the first surface 31 of the reinforcing portion 30 is represented by reference numeral 31 e, and the end portion of the second surface 32 of the reinforcing portion 30 is represented by reference numeral 32 e. As shown in FIG. 4, the distal end portion 33 is configured as a flat surface that extends substantially flat between the end portion 31 e and the end portion 32 e. The first surface 31 and the tip portion 33 intersect at a substantially right angle, and similarly, the second surface 32 and the tip portion 33 intersect at a substantially right angle. That is, in the present embodiment, the position of the end portion 31e and the position of the end portion 32e in the left-right direction in FIG. 4 (the direction in which the first surface 31 and the second surface 32 extend) coincide with each other.

  Next, the shape of the side surface 22c of the unit base material 22 will be described. As shown in FIG. 4, the side surface 22c of the unit base member 22 includes a first side surface 22d and a second side surface 22e. The first side surface 22 d intersects with the end 22 ae of the first surface 22 a of the unit base material 22, and spreads outward with respect to the unit base material 22 toward the second surface 22 b side of the unit base material 22. Further, the second side surface 22e intersects the end 22be of the second surface 22b of the unit base member 22, extends outward with respect to the unit base member 22 toward the first surface 22a side of the unit base member 22, and It merges with one side 22d. For this reason, the confluence | merging part of 22 d of 1st side surfaces and the 2nd side surface 22e will protrude outside. In this case, since the reinforcing part 30 sandwiches the side surface 22c of the unit base material 22, the reinforcing part 30 can be firmly adhered to the side surface 22c of the unit base material 22. “Outside the unit base material 22” means a side away from the center C of the unit base material 22 (see FIG. 2). Further, “inner side with respect to the unit base material 22” to be described later means a side closer to the center C of the unit base material 22.

  As shown in FIG. 4, the first side surface 22 d of the unit base material 22 may include a curved surface that is curved to be convex inward. “Inwardly convex” means that the first side surface 22d is from a virtual line (plane) VL1 connecting the end 22ae of the first surface 22a and the joining position of the first side surface 22d and the second side surface 22e. Is also located inside the unit substrate 22. As shown in FIG. 4, the second side surface 22e may also include a curved surface that is curved to be convex inward. The first side surface 22d and the second side surface 22e having such shapes are, for example, as described later, when the large base material 40 is divided to obtain the unit base material 22, and the first surface side of the base material 40 and It is formed by wet-etching the base material 40 from both the second surface side.

(Dimension of cover glass)
Next, the dimensions of the cover glass 20 will be described. First, the covering dimension of the reinforcing portion 30 provided on the side surface 22c of the unit base material 22 will be described. Here, the covering dimension is the length of the reinforcing portion 30 in the direction along the normal direction of the distal end portion 33 of the reinforcing portion 30. The normal direction of the distal end portion 33 of the reinforcing portion 30 is parallel to the left-right direction in FIG.

  In FIG. 4, the minimum value of the covering dimension of the reinforcing part 30 is represented by the symbol Tmin. In the present embodiment, as described above, the first side surface 22d of the unit base member 22 spreads outward toward the second surface 22b side. Moreover, the 2nd side 22e of the unit base material 22 has spread outside as it goes to the 1st surface 22a side. Further, as described above, the distal end portion 33 of the reinforcing portion 30 is a flat surface that intersects the first surface 31 and the second surface 32 at a right angle. For this reason, as shown in FIG. 4, the covering dimension of the reinforcing portion 30 becomes the minimum value Tmin at the position where the first side surface 22d and the second side surface 22e merge.

  The minimum value Tmin of the covering dimension of the reinforcing portion 30 is appropriately set so that the side surface 22c of the unit base material 22 can be protected even when an impact is applied to the side surface 20c of the cover glass 20 or the like. Yes. For example, the minimum value Tmin of the covering dimension of the reinforcing portion 30 is set to 20 μm or more. In addition, in the part which the compressive-stress layer 24a is exposed among the side surfaces 22c of the unit base material 22, sufficient intensity | strength may be securable even if the reinforcement part 30 is not provided. Therefore, “the minimum value Tmin of the covering dimension of the reinforcing portion 30” may be defined as the minimum value of the covering dimension of the reinforcing portion 30 provided on the tensile stress layer 24b of the side surface 22c.

  In the present embodiment, the covering dimension of the reinforcing portion 30 becomes the maximum value at the position of the first surface 31 or the position of the second surface 32. By the way, if the maximum value of the covering dimension of the reinforcing portion 30 becomes too large, it is considered that the reinforcing portion 30 is easily peeled off from the unit base material 22 when an impact is applied to the cover glass 20. Moreover, since the ratio of the glass in the cover glass 20 reduces and the ratio of resin increases, it is also considered that the intensity | strength of the cover glass 20 falls. Considering this point, the maximum value of the covering dimension of the reinforcing portion 30 is set to 250 μm or less in the thinnest portion (the portion represented by the symbol Tmin in FIG. 4), and the thickest portion (see FIG. 4). In the portion represented by the symbol Tmax), it is preferably set to 500 μm or less.

  As an example, in the example shown in FIG. 4, the covering dimension Tmin of the reinforcing part 30 in the thinnest part is set to 100 μm, and the covering dimension Tmax of the reinforcing part 30 in the thickest part is set to 300 μm. Conceivable.

  The thickness of the cover glass 20 (that is, the thickness of the unit base material 22 and the thickness of the reinforcing portion 30) is appropriately set according to the required strength, the area of the cover glass 20, and the like. It is within range.

(When light enters the cover glass from the side)
As described above, the cover glass 20 may be attached to the display device 15 so that the side reinforcing portion 30 can be seen by the user. In this case, as shown in FIG. 5, the light incident on the reinforcing portion 30 from the side surface 20 c of the cover glass 20 reaches the first side surface 22 d and the second side surface 22 e of the side surface 22 c of the unit base material 22. Here, in the present embodiment, as described above, the first side surface 22d of the unit base member 22 includes a curved surface curved so as to be convex inward. In this case, when the refractive index N1 of the resin material constituting the reinforcing portion 30 is larger than the refractive index N2 of the glass constituting the unit base member 22, the first side surface 22d is reached as shown in FIG. The light L1 to L3 may be totally reflected by the first side surface 22d. It is also conceivable that the light L1 to L3 once totally reflected by the first side surface 22d reaches the first side surface 22d again and is totally reflected again by the first side surface 22d. When the light L1 to L3 repeats total reflection at the first side surface 22d, the light L1 to L3 is a boundary between the first surface 22a of the unit base member 22 and the first surface 31 of the reinforcing portion 30, as shown in FIG. Gather nearby. As a result, the vicinity of the boundary between the first surface 22a of the unit base member 22 and the first surface 31 of the reinforcing portion 30 is noticeable by the lights L1 to L3. That is, the boundary between the first surface 22a of the unit base member 22 and the first surface 31 of the reinforcing portion 30 is recognized by the user. This is not preferable from the viewpoint of the design beauty of the cover glass 20.

  In consideration of such a problem, in the present embodiment, it is proposed to use a resin material having a light shielding property as the resin material constituting the reinforcing portion 30. In this case, as shown in FIG. 6, even if the light L1 to L3 incident on the reinforcing portion 30 from the side surface 20c of the cover glass 20 repeats total reflection on the first side surface 22d, the light L1 to L3 is the reinforcing portion. The light L <b> 1 to L <b> 3 can be sufficiently attenuated while traveling through the interior of 30. For this reason, even if light L1-L3 gathers in the boundary vicinity of the 1st surface 22a of the unit base material 22 and the 1st surface 31 of the reinforcement part 30, the 1st surface 22a of the unit base material 22 and the reinforcement part 30 of FIG. It can suppress that the boundary with the 1st surface 31 will be recognized by the user. This allows the user to recognize that the unit base material and the reinforcing portion are integral with each other.

  As the resin material of the reinforcing portion 30, a material capable of sufficiently attenuating light between the time when light enters from the tip portion 33 and the time when the light exits from the first surface 31 is used. Here, the thickness of the unit base member 22 and the thickness of the reinforcing part 30 will be secured at least about 0.1 mm, and the covering dimension Tmin of the reinforcing part 30 will be secured about 20 μm. Considering it, it is considered that the optical path length of the light from when the light is incident from the front end portion 33 until it is emitted from the first surface 31 is at least 100 μm or more. In consideration of this point, the resin material of the reinforcing portion 30 is selected so that the average transmittance of the test piece 26s having a thickness of 100 μm formed using the resin material is 10% or less, more preferably 1% or less. That is, in the present embodiment, “the resin material of the reinforcing portion 30 has a light shielding property” means that the average transmittance of the test piece 26 s cut out from the reinforcing portion 30 and having a thickness of 100 μm is 10% or less. ing.

  As the “average transmittance”, for example, an average value of transmittance values measured at a plurality of light wavelengths using a microspectrophotometer can be adopted. Specifically, first, the test piece 26 s cut out from the reinforcing portion 30 is placed on the support substrate 100. Next, using a microspectrophotometer, the intensity of light transmitted through the test piece 26s and the support substrate 100 is measured at intervals of 5 nm at light wavelengths of 380 nm to 780 nm. Further, the transmittance of the test piece 26s at each light wavelength is calculated based on the comparison with the light intensity in the reference measurement. Then, the average value of the transmittance obtained at each light wavelength is calculated. Thereby, the average transmittance can be calculated. In FIG. 7, the thickness of the test piece 26 s is represented by reference numeral S <b> 1, and the width of the test piece 26 s is represented by reference numeral S <b> 2. The thickness S1 is set to 100 μm as described above. The width S2 is set to be larger than the spot diameter of light incident upon measurement, and is set to 20 μm or more, for example.

  As the microspectrophotometer, for example, a microspectrophotometer OSP-SP200 manufactured by Olympus Corporation can be used. The reference measurement can be performed using, for example, an optical glass (quartz n = 1.46, BK7 n = 1.52, etc.) having a thickness of 0.03 mm to 0.7 mm and transparent in the visible region.

  Various configurations are conceivable as specific configurations of the resin material of the reinforcing portion 30 in order to reduce the above-described average transmittance to 10% or less. For example, it is conceivable to disperse particulate pigments or dyes having light shielding properties in the resin. Examples of particulate pigments and dyes include carbon black and titanium black. Alternatively, as a specific configuration of the resin material, a resin having a light shielding property may be used. Thus, since the reinforcement part 30 has light-shielding property, the condensing by refraction | bending and reflection can be prevented reliably.

(Other components of cover glass)
As illustrated in FIG. 8, a decoration portion 60 for exhibiting a desired color may be provided in the non-active area Aa2 on the second surface 20b side of the cover glass 20. The color of the decoration part 60 is selected according to the design property calculated | required with respect to the display apparatus 10 with a cover glass. For example, black, white, light blue, pink, green, etc. can be mentioned as an example of the color of the decoration part 60. Although the material which comprises the decorating part 60 is determined according to the selected color, for example, when white is calculated | required, the decorating part 60 is comprised from the resin material in which coloring pigments, such as a titanium oxide, were disperse | distributed. The

  Further, as shown in FIG. 9, a touch panel sensor unit 50 including a sensor electrode for detecting the approach or contact of the outer conductor may be provided on the second surface 20 b side of the cover glass 20. In this case, the cover glass 20 can play not only a role of protecting the display device 15 but also a role of imparting a touch panel function to the display device 15.

(Method for manufacturing cover glass)
Next, a method for manufacturing the cover glass 20 having the above configuration will be described with reference to FIGS.

  First, referring to FIG. 10 to FIG. 12A and FIG. 12B, a process of forming a unit laminate 45 having a unit base 22 and protective films 81 and 82 using a base 40 made of large tempered glass. Will be described. In addition, FIG. 10, FIG. 11 (a) and FIG. 12 (a) are sectional drawings which show the base material 40 in this process. Moreover, FIG.11 (b) is a top view which shows the base material 40 in this process. FIG. 12B is an enlarged sectional view of the unit laminate body 45 shown in FIG.

  First, as shown in FIG. 10, a base material 40 made of large tempered glass is prepared. The base material 40 includes a first surface 40a, a second surface 40b on the opposite side of the first surface 40a, and a side surface 40c extending between the first surface 40a and the second surface 40b. As shown in FIG. 10, a compressive stress layer 24a is formed on the first surface 40a, the second surface 40b, and the side surface 40c of the base material 40, and a tensile stress layer 24b exists inside the compressive stress layer 24a. doing. As described above, the entire surface of the substrate 40 is formed by the compressive stress layer 24a.

  Next, as shown in FIGS. 11A and 11B, a first protective film 81 and a second protective film 82 are provided in a predetermined plurality of sections on the first surface 40a and the second surface 40b of the substrate 40. A protective film forming step is performed. The protective films 81 and 82 function as a resist that protects the substrate 40 when the substrate 40 is divided by wet etching, which will be described later, using hydrofluoric acid or the like.

  The method for forming the partitioned protective films 81 and 82 as shown in FIGS. 11A and 11B is not particularly limited. For example, first, the first protective film 81 and the second protective film 82 are provided so as to cover the entire area of the first surface 40a and the second surface 40b of the substrate 40, and then the first protective film 81 and the second protective film 82 may be patterned. The patterning method is not particularly limited. For example, the first protective film 81 and the second protective film 82 that are provided over the entire area of the first surface 40 a and the second surface 40 b are processed using a mold or a laser processing method for each section of the base material 40. And may be divided. Also, a photolithography method can be adopted. The size of each section corresponds to the size of each unit base material 22 obtained by cutting the base material 40. Also, a plurality of protective films 81 and 82 having the shapes shown in FIGS. 11A and 11B are prepared, and the protective films 81 and 82 are attached to predetermined positions on the surfaces 40a and 40b of the base 40. You may do it.

  By the way, the protective films 81 and 82 not only function as a resist for protecting the base material 40 when the base material 40 is divided by wet etching, but are applied on the side surface 22c of the unit base material 22 as described later. It also functions as a wall that blocks the coating liquid 35 from spilling. In consideration of this point, preferably, the protective films 81 and 82 have resistance to an etching solution used to divide the substrate 40 and can withstand the weight of the coating solution 35 and the pressure from the coating solution 35. Configured to have a degree of strength. For example, biaxially stretched polypropylene, unstretched polypropylene, or the like can be used as a material constituting the protective films 81 and 82. In this case, even if the protective films 81 and 82 are configured by sticking a biaxially stretched polypropylene sheet or an unstretched polypropylene sheet on the first surface 40a and the second surface 40b of the substrate 40 via the adhesive layer. Good. The thicknesses of the biaxially stretched polypropylene and unstretched polypropylene constituting the protective films 81 and 82 are preferably set to 50 μm or more, for example, in the range of 50 μm to 100 μm. The thickness of the adhesive layer is, for example, about 20 μm.

  Thereafter, as shown in FIG. 12A, a cutting process is performed in which the base material 40 is cut along the gaps between the protective films 81 and 82 provided in each section of the base material 40. Specifically, from the first surface 40a side and the second surface 40b side of the base material 40, by performing an etching process of wet etching the base material 40 using the first protective film 81 and the second protective film 82 as a resist. Then, the substrate 40 is cut. As the etching solution, hydrofluoric acid or the like is used as described above. Accordingly, as shown in FIG. 11A, the unit base 22 made of glass, the first protective film 81 provided on the first surface 22 a of the unit base 22, and the second of the unit base 22 A unit laminate body 45 having the second protective film 82 provided on the surface 22b can be obtained.

  FIG. 12B is an enlarged sectional view of the unit laminate body 45 shown in FIG. As shown in FIG. 12B, the first protective film 81 is configured to protrude laterally from the first surface 22 a of the unit base material 22. Similarly, the second protective film 82 is configured to protrude from the second surface 22 b of the unit base member 22 to the side. Such a relationship between the unit base material 22 and the first protective film 81 and the second protective film 82 is based on the fact that the first surface 22a of the unit base material 22 and the first surface 22a of the unit base material 22 are formed during the above-described cutting process using an etching solution. This is realized by continuing the etching process for a time that allows the unit base material 22 to be penetrated by etching from both of the two surfaces 22b. Specifically, in the etching step, the depth direction (thickness direction of the unit base material 22) and the horizontal direction (units) are usually at positions near the first surface 22a and the second surface 22b of the side surface 22c of the unit base material 22. Etching proceeds isotropically in any of the surface directions of the substrate 22. For this reason, as shown in FIG. 12B, in the vicinity of the first surface 22a and the second surface 22b of the side surface 22c of the unit base member 22, an intermediate portion between the first surface 22a and the second surface 22b is provided. In comparison, etching proceeds deeper in the horizontal direction. As a result, the first side surface 22d that intersects the end portion 22ae and expands outward as it goes to the second surface 22b side, and the second side surface 22e that intersects the end portion 22be and extends outward toward the first surface 22a side, can get.

  Next, referring to FIG. 13 and FIG. 14, a process for obtaining the cover glass 20 whose side surfaces are reinforced by providing reinforcing portions (resin etc.) on the side surfaces 22 c of the unit base material 22 of the unit laminate body 45. explain.

  First, as shown in FIG. 13, an application step of applying an application liquid 35 containing a curable material such as an ultraviolet curable resin or a thermosetting resin onto the side surface 22 c of the unit base material 22 is performed. Here, the case where the coating liquid containing acrylic resin and a photoinitiator is used is demonstrated.

  In the coating step, the coating solution 35 is filled in a space surrounded by the side surface 22c of the unit base member 22, the first protective film 81, and the second protective film 82, as shown in FIG. As shown in FIG. 13, the coating liquid 35 may be applied to such an extent that it overflows also onto the end surface 81c of the first protective film 81 and the end surface 82c of the second protective film 82.

  Next, the coating liquid 35 overflowing on the end surface 81c of the first protective film 81 and the end surface 82c of the second protective film 82 is scraped off using a squeegee or the like. As a result, as shown in FIG. 14, the surface of the coating solution 35 coincides with the end surface 81 c of the first protective film 81 and the end surface 82 c of the second protective film 82. That is, the position of the end of the liquid surface of the coating liquid 35 on the first protective film 81 side coincides with the position of the end surface 81c of the first protective film 81, and the liquid surface of the coating liquid 35 on the second protective film 82 side. The position of the end portion coincides with the position of the end surface 82 c of the second protective film 82.

  Then, the hardening process which hardens the coating liquid 35 provided on the side surface 22c of the unit base material 22 is implemented. Here, the coating liquid 35 is cured by irradiating the coating liquid 35 with light such as ultraviolet rays. Thereby, the reinforcing portion 30 is formed on the side surface 22 c of the unit base material 22.

  Next, the first protective film 81 on the first surface 22a of the unit base 22 and the second protective film 82 on the second surface 22b of the unit base 22 are removed. Thereby, as shown in FIG. 3 described above, the cover glass 20 including the unit base member 22 and the reinforcing portion 30 provided on the side surface 22c of the unit base member 22 can be obtained.

  According to the present embodiment, the reinforcing portion 30 made of a curable resin is provided on the side surface 22 c of the unit base material 22. For this reason, when an impact is applied to the side surface 20 c of the cover glass 20, the force transmitted to the side surface 22 c of the unit base material 22 is relaxed by the reinforcing portion 30, and damage such as cracks occurs on the side surface 22 c of the unit base material 22. This can be suppressed. Thereby, even if the compressive stress layer is not formed on the side surface 22c of the unit base member 22, the impact resistance of the cover glass 20 can be sufficiently increased. Further, even if the tensile stress layer 24b is exposed on the side surface 22c of the unit base member 22, the exposed tensile stress layer 24b can be covered with the reinforcing portion 30, so that the impact resistance of the cover glass 20 is increased. Sex can be made high enough.

  Further, according to the present embodiment, as described above, the reinforcing portion 30 is on the side of the first protective film 81 projecting laterally from the first surface 22a of the unit base material 22 and the second surface 22b of the unit base material 22. It is formed in the space positioned by the second protective film 82 protruding in the direction. For this reason, as shown in FIG. 3, the first surface 22 a of the unit base member 22 and the first surface 31 of the reinforcing portion 30 are located on the same plane. Similarly, the 2nd surface 22b of the unit base material 22 and the 2nd surface 32 of 26 are located on the same plane. That is, there is no or almost no step between the unit base member 22 and the reinforcing portion 30. For this reason, it can suppress that the boundary between the unit base material 22 and the reinforcement part 30 is visually recognized by an observer. Therefore, according to the reinforcement part 30 of this Embodiment, ensuring of the intensity | strength of the side surface 20c of the cover glass 20 and ensuring of the design property of the cover glass 20 can be made to make compatible. In addition, the operational feeling of the touch panel is not hindered by the steps.

  Moreover, in this Embodiment, what has light-shielding property is used as a resin material which comprises the reinforcement part 30. FIG. For this reason, even if the light incident on the reinforcing portion 30 from the side surface 20c of the cover glass 20 repeats total reflection on the first side surface 22d of the unit base member 22, the light travels inside the reinforcing portion 30. Light can be sufficiently attenuated. This suppresses the user from recognizing the boundary between the first surface 22a of the unit base member 22 and the first surface 31 of the reinforcing portion 30 due to the light collecting function by the first side surface 22d. Can do.

  Note that various modifications can be made to the above-described embodiment. Hereinafter, some modifications will be described with reference to the drawings. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding parts in the above embodiment are used for the parts that can be configured in the same manner as in the above embodiment. A duplicate description is omitted. In addition, when it is clear that the operational effects obtained in the above-described embodiment can be obtained in the modified example, the description thereof may be omitted.

(First modification)
In the present embodiment described above, the position of the end surface 81 c of the first protective film 81 and the position of the end surface 82 c of the second protective film 82 are viewed along the normal direction of the base material 40 or the unit base material 22. Although an example that matches the case is shown, it is not limited to this. For example, as shown in FIGS. 15A and 15B, the end surface 82c of the second protective film 82 provided on the second surface 40b is more than the end surface 81c of the first protective film 81 provided on the first surface 40a. The unit base material 22 obtained by cutting the base material 40 may be positioned outside. As a result, the gap between the first protective films 81 is larger than the gap between the second protective films 82. The distance d between the end surface 81c of the first protective film 81 and the end surface 82c of the second protective film 82 is determined according to the shape of the side surface 22c of the unit base member 22, and is within a range of, for example, 50 to 2000 μm. More specifically, it is about 300 μm.

  When the substrate 40 is wet etched using the first protective film 81 and the second protective film 82 shown in FIGS. 15A and 15B as resists, the gap between the protective films is larger on the first surface 40a side. Etching from the first surface 40a side proceeds deeper than the second surface 40b side. As a result, in the unit base material 22 obtained by the cutting process by wet etching, as shown in FIG. 16, the end portion 22ae of the first surface 22a of the unit base material 22 is more than the end portion 22be of the second surface 22b. It is located on the inner side, that is, the side closer to the center C of the unit base material 22. Further, the position where the first side surface 22d on the first surface 22a side and the second side surface 22e on the second surface 22b side join is not an intermediate position between the first surface 22a and the second surface 22b, but closer to the second surface 22b. It becomes the position.

  FIG. 17 is a diagram illustrating a state in which the coating liquid 35 is filled in a space surrounded by the side surface 22 c of the unit base member 22, the inner surface 81 a of the first protective film 81, and the inner surface 82 a of the second protective film 82. . By the way, in the present embodiment, as described above, protection is performed so that the end surface 82c of the second protective film 82 is located outside the end surface 81c of the first protective film 81, that is, on the side away from the center C of the unit base material 22. Films 81 and 82 are provided. For this reason, when the coating liquid 35 is applied in a state where the unit base material 22 is supported so that the second protective film 82 is positioned below the first protective film 81, the outer side than the first protective film 81. The coating liquid 35 can be supported from below by the second protective film 82 protruding to the bottom. For this reason, as shown in FIG. 17, from a virtual line (plane) VL2 connecting the end portion 81e inside the end surface 81c of the first protective film 81 and the end portion 82e inside the end surface 82c of the second protective film 82. Also, it is possible to easily realize that the coating liquid 35 is applied so as to overflow to the outside. In the present embodiment, as described above, the first side surface 22d on the first surface 22a side and the second side surface 22e on the second surface 22b side are intermediate positions between the first surface 22a and the second surface 22b. Instead, they meet at a position near the second surface 22b. For this reason, when the coating liquid 35 is applied, the coating liquid 35 can be more stably held by the first side surface 22 d of the side surface 22 c of the unit base member 22. This also has an advantageous effect on facilitating the coating process.

  Next, the coating liquid 35 is cured to form the reinforcing portion 30. Then, you may implement the process process which processes the reinforcement part 30 in a desired shape. Thus, for example, as shown in FIG. 18, the first surface 31 including the first connection surface 31a and the first inward surface 31b, and the second surface 32 including the second connection surface 32a and the second inward surface 32b, The reinforcement part 30 which has can be obtained. Note that similar processing may be performed on the reinforcing portion 30 in the above-described embodiment shown in FIGS. 3 and 4.

The first connection surface 31 a is a surface that extends laterally from the end 22 ae of the first surface 22 a of the unit base material 22 on the same plane as the first surface 22 a of the unit base material 22. The first inward surface 31b is a surface located closer to the second surface 22b side of the unit base material 22 than the first connection surface 31a in the thickness direction of the unit base material 22. For example, the 1st inward surface 31b has spread toward the inner side in the thickness direction of the unit base material 22 from the boundary part with the 1st connection surface 31a.
The second connection surface 32a is a surface extending laterally from the end 22be of the second surface 22b of the unit base material 22 on the same plane as the second surface 22b of the unit base material 22. The second inward surface 32b is a surface located closer to the first surface 22a side of the unit base material 22 than the second connection surface 32a in the thickness direction of the unit base material 22.

  Since the reinforcement part 30 is comprised by the resin material as mentioned above, compared with the case where the side surface 20c of the cover glass 20 is comprised by the tempered glass, the side surface 20c of the cover glass 20 is processed, and desired shape is formed. Is easier to get. In addition, strength reduction and microcracks are less likely to occur due to processing. As a processing method, for example, processing using a polishing machine can be employed. Further, the covering dimension of the reinforcing portion 30 provided on the side surface 22c of the unit base material 22 is set such that the side surface 22c (here, the first side surface 22d) of the unit base material 22 located on the inner side and the distal end portion 33 of the reinforcing portion 30 are Can be secured more widely between. In this modification, the covering dimension of the reinforcing portion 30 is set within a range of 20 to 2000 μm, for example.

  According to the present modification, the first side surface 22d and the second side surface 22e on the first surface 22a side and the second side surface 22e on the second surface 22b side are joined at a position closer to the second surface 22b, thereby reinforcing the first side surface 22d. The first inward surface 31b of the first surface 31 of the reinforcing portion 30 can be secured more widely while sufficiently securing the thickness of the reinforcing portion 30 between the first surface 31 and the distal end portion 33 of the portion 30. Become. This makes it possible to make the shape feature of the reinforcing portion 30 more prominent.

  Also in this modification, a resin material having a light shielding property is used as the resin material constituting the reinforcing portion 30. Therefore, even when light incident on the reinforcing portion 30 from the side surface 20c of the cover glass 20 repeats total reflection at the first side surface 22d, the light is sufficiently attenuated while traveling inside the reinforcing portion 30. Can be made. This suppresses the user from recognizing the boundary between the first surface 22a of the unit base member 22 and the first surface 31 of the reinforcing portion 30 due to the light collecting function by the first side surface 22d. Can do.

(Second modification)
In the above-described embodiment and the first modification, the example in which the first side surface 22d of the unit base member 22 includes a curved surface that is curved to be convex inward has been described. However, the present invention is not limited to this, and as shown in FIG. 19, the first side surface 22 d of the unit base material 22 is flat and inclined toward the second surface 22 b side with respect to the first surface 22 a of the unit base material 22. An inclined surface may be included. Even in this case, by using a resin material having a light shielding property as the resin material constituting the reinforcing portion 30, the unit base material 22 is caused by light incident on the reinforcing portion 30 from the side surface 20 c of the cover glass 20. It can suppress that the boundary of the 1st surface 22a and the 1st surface 31 of the reinforcement part 30 will be recognized by the user.

(Modified example of composition of coating solution)
In the above-described embodiment, the example in which the coating liquid 35 applied on the side surface 22c of the unit base material 22 includes a curable material such as an ultraviolet curable resin or a thermosetting resin has been described. It will never be done. In the present embodiment and other embodiments to be described later, the reinforcing portion has a predetermined fluidity when applied onto the side surface 22c of the unit base member 22, but can be cured thereafter. Various fluids can be used as the coating liquid 35 for forming 30. For example, a fluid made of a resin material melted by heat may be used as the coating liquid 35. In this case, after the coating liquid 35 is applied onto the side surface 22c of the unit base member 22, the coating liquid 35 is hardened by being cooled and solidified. Thereby, the reinforcement part 30 containing a resin material can be obtained. As described above, in this embodiment and other embodiments described later, “curing” is not only a phenomenon in which the resin material is cured by heating or ultraviolet irradiation, but also the resin material is cured by being cooled and solidified. It is a concept that also includes the phenomenon. The resin material may be cooled and solidified by natural cooling, or the resin material may be cooled and solidified by forced cooling. “Solidification” means that the substance changes from a gas or liquid state to a solid state.

(Modification of coating range of coating solution)
Further, in the above-described embodiment, the surface of the coating liquid 35 is coincident with the end surface 81c of the first protective film 81 and the end surface 82c of the second protective film 82, or is positioned outside the end surfaces 81c and 82c. Until now, the example in which the coating liquid 35 is filled in the space surrounded by the side surface 22c of the unit base member 22, the first protective film 81, and the second protective film 82 has been described, but the present invention is not limited thereto. In the coating process of the present embodiment and other embodiments described later, the surface of the coating liquid 35 is located inside the end surface 81c of the first protective film 81 and the end surface 82c of the second protective film 82. Alternatively, it may be applied in a space surrounded by the side surface 22c of the unit base member 22, the first protective film 81, and the second protective film 82. In this case, the end portion 31e and the end portion 32e of the reinforcing portion 30 formed from the coating liquid 35 are inside (on the unit base material 22 side) than the end surface 81c of the first protective film 81 and the end surface 82c of the second protective film 82. Will come to be located.

(Modifications related to the material constituting the reinforcing part)
In the above-described embodiment and each modified example and other embodiments described later, the reinforcing portion 30 is formed by curing the coating liquid 35. For this reason, if a large shrinkage occurs when the coating liquid 35 is cured, the accuracy of the dimensions of the reinforcing portion 30 is lowered. Moreover, when big shrinkage arises, the adhesiveness between the reinforcement part 30 and the side surface 22c of the unit base material 22 will also fall. Further, when large shrinkage occurs in the thickness direction of the unit base material 22 (the normal direction of the first surface 22a and the second surface 22b of the unit base material 22), the first surface 22a and the second surface 22b of the unit base material 22 are generated. And a large step is generated between the first surface 31 and the second surface 32 of the reinforcing portion 30, and as a result, the boundary between the unit base material 22 and the reinforcing portion 30 is easily seen by an observer. Accordingly, the material constituting the coating liquid 35 and the reinforcing portion 30 is preferably a material that can shrink as much as possible when it is cured. For example, even when shrinkage occurs during curing, the step between the first surface 22a and the second surface 22b of the unit base member 22 and the first surface 31 and the second surface 32 of the reinforcing portion 30 is reduced. A material that can be suppressed within the range of 1 to 10 μm is preferable.

  As described above, the thickness of the compressive stress layer 24a is generally in the range of 10 to 100 μm. Therefore, selecting a material having a small shrinkage when cured and thereby suppressing the step between the unit base member 22 and the reinforcing portion 30 within a range of 1 to 10 μm respectively means that the degree of shrinkage of the compressive stress layer 24a It leads to become smaller than thickness. For this reason, even if the coating liquid 35 and the reinforcement part 30 shrink | contract at the time of hardening, it can prevent that the tensile stress layer 24b is exposed to the side surface 20c of the cover glass 20. FIG.

  As a result of intensive experiments by the present inventors, when a polyene-polythiol-based photocurable resin is used as a material constituting the coating liquid 35 and the reinforcing portion 30, the first surface 22 a and the second surface of the unit base material 22 are used. The level difference between the surface 22b and the first surface 31 and the second surface 32 of the reinforcing portion 30 could be suppressed within the range of 1 to 10 μm, more specifically about 5 μm. The unit base material 22 used in the experiment had a thickness of 700 μm.

  Based on the experimental results described above, the conditions relating to the shrinkage rate required for the material constituting the coating liquid 35 and the reinforcing portion 30 will be examined. Here, the shrinkage rate in the thickness direction of the unit base material 22 (hereinafter, also referred to as “thickness direction linear shrinkage rate”) will be examined. When steps of 10 μm are generated between the first surface 22 a and the second surface 22 b of the unit base material 22 on both the first surface 31 side and the second surface 32 side of the reinforcing portion 30, the coating liquid 35 is cured. In this case, the thickness direction linear shrinkage ratio is (10 μm × 2/700 μm) × 100 = 2.86%. When the step is 5 μm, the thickness direction linear shrinkage when the coating liquid 35 is cured is (5 μm × 2/700 μm) × 100 = 1.43%. From this, in order to obtain the reinforcing portion 30 having the first surface 31 and the second surface 32 located on the same plane as the first surface 22a and the second surface 22b of the unit base material 22, the coating liquid 35 is configured. It can be said that it is required to use a material having a linear shrinkage rate of 3% or less, more preferably 1.5% or less.

  In the above-described experiment, the coating liquid 35 is in contact with the side surface 22 c of the unit base material 22. For this reason, in the vicinity of the side surface 22c of the unit base material 22, the side surface 22c of the unit base material 22 exerts a force in a direction that prevents the contraction against the coating liquid 35 that is intended to contract in the thickness direction of the unit base material 22. It is thought to affect. Therefore, the thickness direction linear contraction rate when the coating liquid 35 in contact with the side surface 22c contracts in the thickness direction of the unit base material 22 is linear contraction rate in other directions, or the coating liquid 35 not in contact with the side surface 22c contracts. This is considered to be smaller than the linear shrinkage rate. In consideration of this point, if a material having a linear shrinkage rate of 3% or less as a single unit is used, the first surface 22a and the first surface 22a of the unit base member 22 in the present embodiment described above and other embodiments described later are used. It is thought that the reinforcement part 30 which has the 1st surface 31 and the 2nd surface 32 which are located on the same plane as the 2nd surface 22b can be obtained reliably. In general, the volume shrinkage can be obtained by raising the linear shrinkage to the third power. Therefore, the condition that “the linear shrinkage rate is 3% or less, more preferably 1.5% or less” is converted into the condition that “the volume shrinkage rate is about 9% or less, more preferably about 4.5% or less”. .

  Hereinafter, the above-described polyene-polythiol-based photocurable resin will be described. The polyene-polythiol-based photocurable resin contains a polyene compound, a polythiol compound, and a photopolymerization initiator. Such a polyene-polythiol-based photocurable resin has an advantage that it has high adhesion to a base material because of less curing shrinkage compared to an acrylic photocurable resin, and is not subjected to polymerization inhibition due to oxygen. have.

A polyene 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 polythiol 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 polyene compound (a) and the polythiol compound (b) is such that the ratio of the number of unsaturated bonds of the polyene compound (a) to the number of thiol groups of the polythiol 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 polyene compound (a) and a polythiol 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.

  In addition, it is conceivable to add a filler to the material constituting the coating liquid 35 and the reinforcing portion 30 in order to reduce the shrinkage at the time of curing. Since the filler has a smaller degree of shrinkage due to heat than the resin material, the addition of the filler can reduce the overall degree of shrinkage when the coating liquid 35 is cured and becomes the reinforcing portion 30. it can. Examples of the filler include carbon black particles. If a filler is added, the light is blocked by the filler, which hinders the polymerization reaction of the photocurable resin, and it is considered that the curing does not proceed sufficiently. In consideration of such problems, a thermosetting resin may be further added to the material constituting the coating liquid 35 and the reinforcing portion 30.

(Modifications regarding the color of the reinforcement)
In the present embodiment and other embodiments described later, the decorating unit 60 may be configured to exhibit the same color as the reinforcing unit 30. For example, the decorating unit 60 may include a color pigment having the same color as the color pigment included in the reinforcing unit 30. The “same color” means that the chromaticities of the two colors are close enough that the difference in color cannot be discerned with the naked eye. More specifically, “same color” means that the color difference ΔE ^* _ab between the two colors is 10 or less, preferably 3 or less. The “different color” means that the color difference ΔE ^* _ab between the two colors is larger than 10. Here, the color difference ΔE ^* _ab is a value calculated based on L ^* , a ^* and b ^* in the L ^* a ^* b ^* color system, and is an index relating to a color difference when observed with the naked eye. Is the value.

  In addition, although some modified examples with respect to the above-described embodiment have been described, naturally, a plurality of modified examples can be applied in combination as appropriate.

Second Embodiment Next, a second embodiment of the present invention will be described. In the first embodiment described above, the boundary between the first surface 22a of the unit base member 22 and the first surface 31 of the reinforcing portion 30 is formed by configuring the reinforcing portion 30 using a resin material having light shielding properties. The example which suppressed that a user will be recognized is shown. In the present embodiment, the user can recognize the boundary between the first surface 22a of the unit base member 22 and the first surface 31 of the reinforcing portion 30 by appropriately setting the refractive index of the resin material of the reinforcing portion 30. An example of suppressing this will be described.

  In the present embodiment, when the refractive index of the resin material of the reinforcing portion 30 is N1, and the refractive index of the glass constituting the unit base material 22 is N2, the reinforcing portion 30 is configured so that N1 ≦ N2 is satisfied. It is proposed to select a resin material. In this case, as shown in FIG. 20, the lights L1 to L3 that have entered the reinforcing portion 30 from the distal end portion 33 and reached the first side surface 22d of the unit base member 22 are not totally reflected by the first side surface 22d. It is possible to enter the inside of the unit base material 22. For this reason, even if the first side surface 22d of the unit base member 22 includes a curved surface that is curved inwardly, the light L1 to L3 is reinforced with the first surface 22a of the unit base member 22. It is possible to prevent the portion 30 from being collected near the boundary with the first surface 31. Thereby, it can suppress that the boundary between the 1st surface 22a of the unit base material 22 and the 1st surface 31 of the reinforcement part 30 will be recognized by the user.

  In addition, the refractive index shown in this specification means the refractive index with respect to the light of wavelength 589nm measured by using D line | wire (wavelength 589nm) of Na lamp | ramp unless otherwise indicated.

  Note that various modifications can be made to the above-described embodiment. Hereinafter, some modifications will be described with reference to the drawings. In the following description and the drawings used in the following description, parts that can be configured in the same manner as in the above-described second embodiment are the same as those used for the corresponding parts in the above-described second embodiment. Reference numerals will be used, and redundant description will be omitted. In addition, when it is clear that the operational effects obtained in the above-described second embodiment can be obtained in the modified example, the description thereof may be omitted.

(First modification)
FIG. 20 shows an example in which the first side surface 22d on the first surface 22a side and the second side surface 22e on the second surface 22b side merge at approximately the middle between the first surface 22a and the second surface 22b. However, as in the case of the first modification of the first embodiment described above, the position where the first side surface 22d on the first surface 22a side and the second side surface 22e on the second surface 22b side meet is Instead of an intermediate position between the first surface 22a and the second surface 22b, the position may be closer to the second surface 22b (see FIG. 21). Even in this case, by selecting the resin material of the reinforcing portion 30 so that N1 ≦ N2 is satisfied, the first base member 22 enters the reinforcing portion 30 from the tip portion 33 as shown in FIG. The lights L1 to L3 that have reached the one side surface 22d can enter the inside of the unit base material 22.

(Second modification)
In the second embodiment and the first modification described above, the case where the refractive index N1 of the resin material of the reinforcing portion 30 ≦ the refractive index N2 of the glass of the unit base material 22 is established. In this modification, a case where the refractive index N1 of the resin material of the reinforcing portion 30 is slightly larger than the refractive index N2 of the glass of the unit base member 22 will be described.

  In FIG. 22, the shortest distance in the direction along the surface direction of the unit substrate 22 from the end 22ae of the first surface 22a of the unit substrate 22 to the position where the first side surface 22d and the second side surface 22e merge. Is represented by M1. Here, the “surface direction” means a direction in which a portion of the first surface 22a of the unit base member 22 located in the active area Aa1 spreads. In FIG. 22, the dimension of the first side surface 22 d of the unit base material 22 in the thickness direction of the unit base material 22 is represented by a symbol M2.

  When the refractive index N1 of the resin material of the reinforcing portion 30 is larger than the refractive index N2 of the glass of the unit base member 22, the light L1 incident on the first side surface 22d at a relatively large incident angle is obtained as shown in FIG. The first side surface 22d is totally reflected. On the other hand, when M1 is sufficiently larger than M2, the light L1 once totally reflected by the first side surface 22d reaches the first side surface 22d again. The incident angle at this time is smaller than the incident angle when the first side 22d is first reached. For this reason, when the difference between the refractive index N1 of the resin material of the reinforcing portion 30 and the refractive index N2 of the glass of the unit base material 22 is small, the light L1 that has reached the first side surface 22d for the second time is reflected inside the unit base material 22 Can enter. In other words, if M1 is sufficiently larger than M2, the refractive index N1 of the resin material of the reinforcing portion 30 ≦ the refractive index N2 of the glass of the unit base material 22 does not hold, and the tip portion 33 changes to the reinforcing portion 30. It is possible to sufficiently suppress the incident light from being collected near the boundary between the first surface 22 a of the unit base member 22 and the first surface 31 of the reinforcing portion 30. As a specific example, when M1 / M2 ≧ 3, it is conceivable to select the resin material of the reinforcing portion 30 so that N1 ≦ N2 + 0.02 is satisfied.

In addition, when the present inventors experimented, the refractive index N1 of the resin material of the reinforcement part 30 was 1.53, the refractive index N2 of the glass of the unit base material 22 was 1.51, and M1 / M2 = 4, it is sufficiently suppressed that light incident on the reinforcing portion 30 from the tip portion 33 is collected near the boundary between the first surface 22a of the unit base member 22 and the first surface 31 of the reinforcing portion 30. did it. On the other hand, when N1 is 1.54, N2 is 1.51, and M1 = 1200 μm, M2 = 300 μm, and M1 / M2 = 4, the light incident on the reinforcing portion 30 from the tip portion 33 is unit base. The material 22 gathered in the vicinity of the boundary between the first surface 22a of the material 22 and the first surface 31 of the reinforcing portion 30, and as a result, the boundary was easily visually recognized.
Furthermore, when the inventors repeated experiments, when N1 was 1.53, N2 was 1.51, and M1 = 1000 μm, M2 = 300 μm, and M1 / M2 = 3.33, the tip portion It was possible to sufficiently suppress the light incident on the reinforcing portion 30 from 33 near the boundary between the first surface 22 a of the unit base member 22 and the first surface 31 of the reinforcing portion 30.

  In addition, although the some modification with respect to 2nd Embodiment mentioned above has been demonstrated, naturally, it is also possible to apply combining several modifications suitably. Moreover, the additional component demonstrated in the above-mentioned 1st Embodiment may be provided in the cover glass 20 in 2nd Embodiment. For example, also in the present embodiment, the cover glass 20 may further include the touch panel sensor unit 50 and the decoration unit 60. Moreover, each modification demonstrated in the above-mentioned 1st Embodiment may be applied to the cover glass 20 in 2nd Embodiment. Further, as in the case of the first embodiment described above, a resin material having a light shielding property may be used as the resin material constituting the reinforcing portion 30.

Third Embodiment Next, a third embodiment of the present invention will be described. In the present embodiment, a boundary between the first surface 22a of the unit base member 22 and the first surface 31 of the reinforcing portion 30 is recognized by the user by providing a light shielding layer on the distal end portion 33 of the reinforcing portion 30. An example of suppressing this will be described.

  As shown in FIG. 23, the cover glass 20 according to the present embodiment further includes a light shielding layer 38 provided on the distal end portion 33 of the reinforcing portion 30. FIG. 23 shows an example in which the light shielding layer 38 is provided over the entire region of the tip 33. By providing such a light shielding layer 38, as shown in FIG. 23, the lights L1 to L3 that have reached the side surface 20c of the cover glass 20 from the side enter the reinforcing portion 30 and the first side surface 22d of the unit base member 22. Can be suppressed. For this reason, even if the first side surface 22d of the unit base member 22 includes a curved surface that is curved inwardly, the light L1 to L3 is reinforced with the first surface 22a of the unit base member 22. It is possible to prevent the portion 30 from being collected near the boundary with the first surface 31. Thereby, it can suppress that the boundary between the 1st surface 22a of the unit base material 22 and the 1st surface 31 of the reinforcement part 30 will be recognized by the user.

  As the light shielding layer 38, one having an average transmittance of 1% or less in the direction along the normal direction of the distal end portion 33 of the reinforcing portion 30 provided with the light shielding layer 38 is preferably used. For example, the light shielding layer 38 can be configured using a material having high light absorption properties such as black ink. Alternatively, the light shielding layer 38 may be configured using a material having high light reflectivity such as white ink. The dimension of the light shielding layer 38 in the direction along the normal direction of the distal end portion 33, that is, the thickness of the light shielding layer 38 is appropriately set so that the average transmittance of the light shielding layer 38 is 1% or less. The average transmittance of the light shielding layer 38 is calculated based on the measurement using a microspectrophotometer, for example, similarly to the case of the average transmittance of the test piece 26s cut out from the reinforcing portion 30 described above.

  Note that various modifications can be made to the above-described embodiment. Hereinafter, some modifications will be described with reference to the drawings. In the following description and the drawings used in the following description, parts that can be configured in the same manner as in the above-described third embodiment are the same as those used for the corresponding parts in the above-described third embodiment. Reference numerals will be used, and redundant description will be omitted. Moreover, when it is clear that the operational effects obtained in the above-described third embodiment can be obtained in the modified example, the description thereof may be omitted.

(First modification)
FIG. 23 shows an example in which the first side surface 22d on the first surface 22a side and the second side surface 22e on the second surface 22b side merge at approximately the middle between the first surface 22a and the second surface 22b. However, as in the case of the first modification of the first embodiment described above, the position where the first side surface 22d on the first surface 22a side and the second side surface 22e on the second surface 22b side meet is The position may be closer to the second surface 22b than the intermediate position between the first surface 22a and the second surface 22b (see FIG. 24). Even in this case, by providing the light shielding layer 38 on the distal end portion 33 of the reinforcing portion 30, the light L1 to L3 is a boundary between the first surface 22a of the unit base member 22 and the first surface 31 of the reinforcing portion 30. It is possible to prevent gathering in the vicinity.

(Second modification)
In the above-described third embodiment and the first modification example thereof, an example in which the light shielding layer 38 is provided over the entire region of the tip portion 33 has been described. However, as long as the light shielding layer 38 is provided so as to overlap the joining position where the first side surface 22d and the second side surface 22e of the unit base material 22 join when viewed along the surface direction of the unit base material 22, the light shielding is performed. The extending range of the layer 38 is not particularly limited. For example, as shown in FIG. 25, the light shielding layer 38 may be provided only partially on the distal end portion 33.

  Preferably, the light shielding layer 38 is incident on the first side surface 22d along the surface direction of the unit base material 22 among the first side surfaces 22d of the unit base material 22 when viewed along the surface direction of the unit base material 22. On the distal end portion 33 of the reinforcing portion 30 so that the incident angle θ of the light L to overlap at least overlaps with a portion in the range of arcsin (N2 / N1) to π / 2, for example, a portion in the range of 70 to 90 °. Provided. That is, it is preferable that the extending range of the light shielding layer 38 is set so as to prevent light that is highly likely to be totally reflected by the first side surface 22 d of the unit base material 22 from entering the reinforcing portion 30. As in the case of the second embodiment described above, N1 is the refractive index of the resin material of the reinforcing portion 30, and N2 is the refractive index of the glass of the unit base member 22.

(Third Modification)
In the above-described third embodiment and the first and second modifications thereof, the light blocking layer 38 is provided on the distal end portion 33 of the reinforcing portion 30 to prevent light from entering the distal end portion 33. An example is shown. In the present modification shown in FIG. 26, an example in which light is prevented from entering the front end portion 33 using the housing 18 that holds the display device 15 and the cover glass 20 will be described.

  As shown in FIG. 26, the display device with a cover glass 10 according to the present modification holds the display device 15, the cover glass 20 provided on the viewer side of the display device 15, the display device 15 and the cover glass 20. And a housing 18. The housing 18 is configured to support the distal end portion 33 of the reinforcing portion 30 from the side. Specifically, the housing 18 includes a light shielding portion 18b that overlaps a joining position where the first side surface 22d and the second side surface 22e of the unit base material 22 join when viewed along the surface direction of the unit base material 22. Contains. Similar to the above-described light shielding layer 38, the light shielding portion 18b is configured such that the average transmittance in the direction along the normal direction of the distal end portion 33 of the reinforcing portion 30 overlapping the covering portion 18b is 1% or less. Yes. As a result, as shown in FIG. 26, it is possible to prevent the lights L1 to L3 that have reached the display device 10 with a cover glass from the side from entering the reinforcing portion 30 and the first side surface 22d of the unit base material 22. . Thereby, it can suppress that the boundary between the 1st surface 22a of the unit base material 22 and the 1st surface 31 of the reinforcement part 30 will be recognized by the user.

  Preferably, as shown in FIG. 26, the upper surface 18 a of the housing 18 is configured to expand in parallel and continuously with the first surface 31 of the reinforcing portion 30, for example, the first inward surface 31 b of the first surface 31. . As a result, the unity of the unit base member 22, the reinforcing portion 30, and the housing 18 can be enhanced.

  In addition, although some modified examples with respect to the above-described third embodiment have been described, naturally, a plurality of modified examples can be applied in combination as appropriate. Moreover, the additional component demonstrated in the above-mentioned 1st Embodiment may be provided in the cover glass 20 in 3rd Embodiment. For example, also in the present embodiment, the cover glass 20 may further include the touch panel sensor unit 50 and the decoration unit 60. Moreover, each modification demonstrated in the above-mentioned 1st Embodiment may be applied to the cover glass 20 in 3rd Embodiment. Further, as in the case of the first embodiment described above, a resin material having a light shielding property may be used as the resin material constituting the reinforcing portion 30. Further, as in the case of the second embodiment described above, the resin material of the reinforcing portion 30 is configured so that total reflection of light does not occur on the first side surface 22d of the unit base member 22 or is difficult to cause total reflection. The refractive index N1 may be adjusted.

Fourth Embodiment Next, a fourth embodiment of the present invention will be described. First, problems in the present embodiment will be described.

  As described above, shrinkage generally occurs when the coating liquid 35 is cured. For this reason, even if it is a case where the coating liquid 35 is apply | coated on the side surface 22c of the unit base material 22 using the 1st protective film 81 and the 2nd protective film 82 as mentioned above, the reinforcement part 30 obtained by this is obtained. A step G may occur between the first surface 31 and the first surface 22a of the unit base member 22 as shown in FIG. Similarly, a step G may also occur between the second surface 32 of the reinforcing portion 30 and the second surface 22b of the unit base member 22. When such a level difference G occurs, the boundary between the unit base member 22 and the reinforcing portion 30 is easily visually recognized by an observer. Further, when the external conductor such as a finger is slid on the cover glass 20, the external conductor feels being caught at the boundary portion between the first surface 22 a of the unit base member 22 and the first surface 31 of the reinforcing portion 30. End up.

  In order to solve such a problem, in the present embodiment, as shown in FIG. 28, a portion of the first surface 22a of the unit base member 22 corresponding to the inactive area Aa2 An inclined surface 22as that is inclined toward the second surface 22b side of the unit base member 22 with respect to a portion corresponding to the active area Aa1 in the first surface 22a is at least partially formed. The inclined surface 22as is formed so as to reach the end 22ae of the first surface 22a of the unit base member 22, as shown in FIG. Further, the first surface 31 of the reinforcing portion 30 is formed with an inclined surface 31 s that extends on the same plane as the inclined surface 22 as of the first surface 22 a of the unit base member 22. In the present embodiment, “on the same plane” means a step between the inclined surface 22 as of the first surface 22 a of the unit base material 22 and the inclined surface 31 s of the first surface 31 of the reinforcing portion 30 (of the unit base material 22. This means that the distance in the thickness direction is 2 μm or less.

  In FIG. 28, the symbol T1 represents the thickness of the unit base material 22 in the active area Aa1. Reference symbol T2 represents the thickness of the unit base member 22 in the portion where the inclined surface 22as of the first surface 22a is formed. Since the inclined surface 22as is inclined toward the second surface 22b as described above, the thickness T2 is smaller than the thickness T1.

  FIG. 28 shows an example in which the first surface 31 of the reinforcing portion 30 is an inclined surface 31s over the entire region. However, the present invention is not limited to this, and at least the unit base material of the first surface 31 is shown. It is only necessary that the inclined surface 31 s be formed in a portion adjacent to the end 22 ae of the first surface 22 a of 22.

  Although not shown, an inclined surface similar to the inclined surface 31 s of the first surface 31 may be formed on the second surface 32 of the reinforcing portion 30.

(Method for manufacturing cover glass)
Next, an example of a method for manufacturing the cover glass 20 having the above configuration will be described.

  First, as shown in FIG. 29A, a cover glass 20 including a unit base member 22 and a reinforcing portion 30 provided on a side surface 22c of the unit base member 22 is produced. Since the method for producing the cover glass 20 shown in FIG. 29A is the same as the method described in the first embodiment, detailed description thereof will be omitted.

  Next, as shown in FIGS. 29 (a) and 29 (b), a polishing step of polishing the first surface 22a of the unit base member 22 and the reinforcing portion 30 using the polishing member 90 is performed. The polishing step is performed so that an inclined surface 31 s extending on the same plane as the inclined surface 22 as of the first surface 22 a of the unit base material 22 is formed on the first surface 31 of the reinforcing portion 30.

As the polishing member 90, a member having a flat surface 91 that can polish an object is preferably used. Such a flat surface 91 for polishing can be configured, for example, by attaching a polishing cloth or paper to the surface of a member having a flat surface. Further, the contact surface of the rotating grindstone with the object may function as the flat surface 91 of the polishing member 90.
In general, the hardness of the resin material constituting the reinforcing portion 30 is lower than the hardness of the glass constituting the unit base member 22. For this reason, when the above-described polishing process is performed using a brush, the reinforcing portion 30 is cut deeper than the unit base material 22, and as a result, the inclined surface 22 as of the first surface 22 a of the unit base material 22 It is conceivable that a large step is generated between the inclined surface 31 s of the first surface 31 of the reinforcing portion 30.
In contrast, when the above-described polishing step is performed using the flat surface 91 of the polishing member 90, the degree of cutting in the unit base material 22 and the degree of cutting in the reinforcing portion 30 are set at the position of the flat surface 91. Can be precisely controlled based on. For this reason, even if there is a difference in hardness, a large step is generated between the inclined surface 22as of the first surface 22a of the unit base member 22 and the inclined surface 31s of the first surface 31 of the reinforcing portion 30. It can be easily suppressed.

  According to the present embodiment, by performing the polishing process for polishing both the first surface 22a of the unit base member 22 and the first surface 31 of the reinforcing portion 30, the slopes are located on the same plane and adjacent to each other. The surface 22as and the inclined surface 31s can be formed on the first surface 22a of the unit base member 22 and the first surface 31 of the reinforcing portion 30, respectively. Thereby, it can suppress that the boundary between the unit base material 22 and the reinforcement part 30 will be visually recognized from an observer.

  Preferably, as shown in FIG. 28, the polishing step is performed so that the inclined surface 22as of the first surface 22a is constituted by the compressive stress layer 24a. That is, the inclined surface 22as is configured such that the tensile stress layer 24b is not exposed to the inclined surface 22as.

  Note that various modifications can be made to the above-described embodiment. Hereinafter, some modifications will be described with reference to the drawings. In the following description and the drawings used in the following description, parts that can be configured in the same manner as in the above-described fourth embodiment are the same as those used for the corresponding parts in the above-described fourth embodiment. Reference numerals will be used, and redundant description will be omitted. Moreover, when it is clear that the operational effects obtained in the above-described fourth embodiment can be obtained in the modified example, the description thereof may be omitted.

(First modification)
FIG. 28 shows an example in which the first side surface 22d on the first surface 22a side and the second side surface 22e on the second surface 22b side merge at approximately the middle between the first surface 22a and the second surface 22b. However, as in the case of the first modification of the first embodiment described above, the position where the first side surface 22d on the first surface 22a side and the second side surface 22e on the second surface 22b side meet is It may be a position closer to the second surface 22b instead of an intermediate position between the first surface 22a and the second surface 22b (see FIG. 30). Even in this case, by forming the inclined surface 22as and the inclined surface 31s which are located on the same plane and are adjacent to each other on the first surface 22a of the unit base member 22 and the first surface 31 of the reinforcing portion 30, respectively. It can suppress that the boundary between the unit base material 22 and the reinforcement part 30 is visually recognized by an observer.

(Second modification)
In the above-described fourth embodiment and the first modification thereof, the example in which the side surface 22c of the unit base member 22 includes the curved first side surface 22d and the second side surface 22e has been described. However, the present invention is not limited to this, and as shown in FIG. 31, the side surface 22c of the unit base member 22 may be a surface that spreads flatly between the first surface 22a and the second surface 22b. Even in this case, by forming the inclined surface 22as and the inclined surface 31s which are located on the same plane and are adjacent to each other on the first surface 22a of the unit base member 22 and the first surface 31 of the reinforcing portion 30, respectively. It can suppress that the boundary between the unit base material 22 and the reinforcement part 30 is visually recognized by an observer.

(Third Modification)
In the present embodiment, the shape of the first surface 31 of the reinforcing portion 30 is finally determined by the polishing process. For this reason, it is not essential to adjust the shape of the reinforcing portion 30 in advance using the first protective film 81 or the second protective film 82. For example, as shown in FIG. 32, the reinforcing portion 30 is formed on the side surface 22c of the unit base material 22 using a dip coating method or the like, and then the first surface 22a and the reinforcing portion 30 of the unit base material 22 are polished. You may implement a process. Even in this case, the inclined surface 22as and the inclined surface 31s that are located on the same plane and are adjacent to each other can be formed on the first surface 22a of the unit base member 22 and the first surface 31 of the reinforcing portion 30, respectively. . Thereby, it can suppress that the boundary between the unit base material 22 and the reinforcement part 30 will be visually recognized from an observer.

  In addition, although the some modification with respect to 4th Embodiment mentioned above has been demonstrated, naturally, it is also possible to apply combining several modifications suitably. Moreover, the additional component demonstrated in the above-mentioned 1st Embodiment may be provided in the cover glass 20 in 3rd Embodiment. For example, also in the present embodiment, the cover glass 20 may further include the touch panel sensor unit 50 and the decoration unit 60. Moreover, each modification demonstrated in the above-mentioned 1st Embodiment may be applied to the cover glass 20 in 3rd Embodiment. Further, as in the case of the first embodiment described above, a resin material having a light shielding property may be used as the resin material constituting the reinforcing portion 30. Further, as in the case of the second embodiment described above, the resin material of the reinforcing portion 30 is configured so that total reflection of light does not occur on the first side surface 22d of the unit base member 22 or is difficult to cause total reflection. The refractive index N1 may be adjusted. Further, similarly to the case of the third embodiment described above, a light shielding layer 38 may be provided on the tip 33 of the reinforcing portion 30.

DESCRIPTION OF SYMBOLS 10 Display apparatus with cover glass 15 Display apparatus 16 Display panel 18 Housing | casing 18a Covering part 20 Cover glass 22 Unit base material 22as Inclined surface 30 Reinforcement part 31 1st surface 31a 1st connection surface 31b 1st inward surface 32 2nd surface 32a 2nd connection surface 32b 2nd inward surface 33 Tip part 35 Coating liquid 36 Resin part 38 Light shielding layer 40 Base material 45 Unit laminated body 50 Touch panel sensor part 60 Decoration part 81 1st protective film 82 2nd protective film 90 Polishing member

Claims (23)

A cover glass provided on the viewer side of the display device,
A first substrate on the observer side, a second surface opposite to the first surface, and a side surface extending between the first surface and the second surface, and a unit substrate made of glass;
Provided on a side surface of the unit base material, and a reinforcing portion including a resin material,
The reinforcing portion includes a first surface extending laterally from an end portion of the first surface of the unit base material, a second surface extending laterally from an end portion of the second surface of the unit base material, and the Including a tip portion extending between the first surface and the second surface of the reinforcing portion;
The side surface of the unit base material intersects the first surface of the unit base material, and a first side surface that spreads outward with respect to the unit base material toward the second surface side of the unit base material; A second side surface that intersects the second surface of the unit base material, extends outward with respect to the unit base material toward the first surface side of the unit base material, and merges with the first side surface; Including
A cover glass in which the resin material of the reinforcing portion has light shielding properties. A cover glass provided on the viewer side of the display device,
A first substrate on the observer side, a second surface opposite to the first surface, and a side surface extending between the first surface and the second surface, and a unit substrate made of glass;
Provided on a side surface of the unit base material, and a reinforcing portion including a resin material,
The reinforcing portion includes a first surface extending laterally from an end portion of the first surface of the unit base material, a second surface extending laterally from an end portion of the second surface of the unit base material, and the Including a tip portion extending between the first surface and the second surface of the reinforcing portion;
The side surface of the unit base material intersects the first surface of the unit base material, and a first side surface that spreads outward with respect to the unit base material toward the second surface side of the unit base material; A second side surface that intersects the second surface of the unit base material, extends outward with respect to the unit base material toward the first surface side of the unit base material, and merges with the first side surface; Including
A cover glass in which the reinforcing portion has light shielding properties.   The cover glass according to claim 1 or 2, wherein the first side surface of the unit base member includes a flat inclined surface inclined with respect to the first surface.   The cover glass according to claim 1, wherein the first side surface of the unit base material includes a curved surface that is curved inwardly with respect to the unit base material.   The cover glass according to any one of claims 1 to 4, wherein the first side surface and the second side surface of the unit base material merge at a position near the second surface of the unit base material.   The cover glass according to any one of claims 1 to 5, wherein a step between the first surface of the unit base material and the first surface of the reinforcing portion is 10 µm or less. A cover glass provided on the viewer side of the display device,
A first substrate on the observer side, a second surface opposite to the first surface, and a side surface extending between the first surface and the second surface, and a unit substrate made of glass;
Provided on a side surface of the unit base material, and a reinforcing portion including a resin material,
The reinforcing portion includes a first surface extending laterally from an end portion of the first surface of the unit base material, a second surface extending laterally from an end portion of the second surface of the unit base material, and the Including a tip portion extending between the first surface and the second surface of the reinforcing portion;
The side surface of the unit base material intersects the first surface of the unit base material, and a first side surface that spreads outward with respect to the unit base material toward the second surface side of the unit base material; A second side surface that intersects the second surface of the unit base material, extends outward with respect to the unit base material toward the first surface side of the unit base material, and merges with the first side surface; Including
The first side surface includes a curved surface that is curved to be convex inward with respect to the unit base material,
A cover glass in which N1 ≦ N2 is established, where N1 is a refractive index of the resin material of the reinforcing portion and N2 is a refractive index of the glass constituting the unit base material. A cover glass provided on the viewer side of the display device,
A rectangular unit base material made of glass, including a first surface on the viewer side, a second surface opposite to the first surface, and a side surface extending between the first surface and the second surface;
Provided on a side surface of the unit base material, and a reinforcing portion including a resin material,
The reinforcing portion includes a first surface extending laterally from an end portion of the first surface of the unit base material, a second surface extending laterally from an end portion of the second surface of the unit base material, and the Including a tip portion extending between the first surface and the second surface of the reinforcing portion;
The side surface of the unit base material intersects the first surface of the unit base material, and a first side surface that spreads outward with respect to the unit base material toward the second surface side of the unit base material; A second side surface that intersects the second surface of the unit base material, extends outward with respect to the unit base material toward the first surface side of the unit base material, and merges with the first side surface; Including
The first side surface includes a curved surface that is curved to be convex inward with respect to the unit base material,
The shortest distance in the direction along the surface direction of the unit base material from the end of the first surface of the unit base material to the position where the first side surface and the second side surface meet is M1, and the unit When the dimension of the first side surface in the thickness direction of the substrate is M2, M1 / M2 ≧ 3,
A cover glass in which N1 ≦ N2 + 0.02 is established, where N1 is a refractive index of the resin material of the reinforcing portion and N2 is a refractive index of the glass constituting the unit base material.   The cover glass according to claim 7 or 8, wherein the reinforcing portion has light shielding properties.   The cover glass according to claim 7 or 8, wherein the first side surface and the second side surface of the unit base material merge at a position near the second surface of the unit base material.   The cover glass as described in any one of Claims 7 thru | or 10 whose level | step difference between the said 1st surface of the said unit base material and the said 1st surface of the said reinforcement part is 10 micrometers or less. A cover glass provided on the viewer side of the display device,
A first substrate on the observer side, a second surface opposite to the first surface, and a side surface extending between the first surface and the second surface, and a unit substrate made of glass;
Provided on a side surface of the unit base material, and a reinforcing portion including a resin material,
The reinforcing portion includes a first surface extending laterally from an end portion of the first surface of the unit base material, a second surface extending laterally from an end portion of the second surface of the unit base material, and the Including a tip portion extending between the first surface and the second surface of the reinforcing portion;
The side surface of the unit base material intersects the first surface of the unit base material, and a first side surface that spreads outward with respect to the unit base material toward the second surface side of the unit base material; A second side surface that intersects the second surface of the unit base material, extends outward with respect to the unit base material toward the first surface side of the unit base material, and merges with the first side surface; Including
The first side surface includes a curved surface that is curved to be convex inward with respect to the unit base material,
When the cover glass is viewed along the surface direction of the unit base material, the cover glass is placed on the tip of the reinforcing portion so as to overlap the joining position where the first side surface and the second side surface of the unit base material meet. A cover glass further comprising a light shielding layer provided on the cover glass. A cover glass provided on the viewer side of the display device,
A first substrate on the observer side, a second surface opposite to the first surface, and a side surface extending between the first surface and the second surface, and a unit substrate made of glass;
Provided on a side surface of the unit base material, and a reinforcing portion including a resin material,
The reinforcing portion includes a first surface extending laterally from an end portion of the first surface of the unit base material, a second surface extending laterally from an end portion of the second surface of the unit base material, and the Including a tip portion extending between the first surface and the second surface of the reinforcing portion;
The side surface of the unit base material intersects the first surface of the unit base material, and a first side surface that spreads outward with respect to the unit base material toward the second surface side of the unit base material; A second side surface that intersects the second surface of the unit base material, extends outward with respect to the unit base material toward the first surface side of the unit base material, and merges with the first side surface; Including
The first side surface includes a curved surface that is curved to be convex inward with respect to the unit base material,
The reinforcing part is a cover glass having a light shielding property.   The cover glass according to claim 12 or 13, wherein the first side surface and the second side surface of the unit base material merge at a position near the second surface of the unit base material.   When the refractive index of the resin material of the reinforcing portion is N1, and the refractive index of the glass constituting the unit base material is N2, the light shielding layer is viewed along the surface direction of the unit base material In addition, an incident angle of light incident on the first side surface along the surface direction of the unit base material in the first side surface of the unit base material is in a range of arcsin (N2 / N1) to π / 2. The cover glass according to claim 12, wherein the cover glass is provided on a tip portion of the reinforcing portion so as to overlap at least the portion.   The cover glass according to any one of claims 12 to 15, wherein a step between the first surface of the unit base material and the first surface of the reinforcing portion is 10 µm or less. A display device;
A cover glass provided on the observer side of the display device,
A display device with a cover glass, wherein the cover glass is made of the cover glass according to any one of claims 1 to 16. A display device;
A cover glass provided on the observer side of the display device;
A housing for holding the display device and the cover glass,
The cover glass is
A first substrate on the viewer side, a second surface on the display device side, and a side surface extending between the first surface and the second surface, and a unit substrate made of glass;
Provided on a side surface of the unit base material, and a reinforcing portion including a resin material,
The reinforcing portion includes a first surface extending laterally from an end portion of the first surface of the unit base material, a second surface extending laterally from an end portion of the second surface of the unit base material, and the Including a tip portion extending between the first surface and the second surface of the reinforcing portion;
The side surface of the unit base material intersects the first surface of the unit base material, and a first side surface that spreads outward with respect to the unit base material toward the second surface side of the unit base material; A second side surface that intersects the second surface of the unit base material, extends outward with respect to the unit base material toward the first surface side of the unit base material, and merges with the first side surface; Including
The first side surface includes a curved surface that is curved to be convex inward with respect to the unit base material,
The display with a cover glass including a light-shielding portion that overlaps a merging position where the first side surface and the second side surface of the unit base material meet when viewed along the surface direction of the unit base material apparatus. A cover glass provided on the viewer side of the display device,
A first substrate on the observer side, a second surface opposite to the first surface, and a side surface extending between the first surface and the second surface, and a unit substrate made of glass;
Provided on a side surface of the unit base material, and a reinforcing portion including a resin material,
The reinforcing portion includes a first surface extending laterally from an end portion of the first surface of the unit base material, a second surface extending laterally from an end portion of the second surface of the unit base material, and the Including a tip portion extending between the first surface and the second surface of the reinforcing portion;
The display device includes a display panel including an active area capable of displaying an image and an inactive area disposed outside the active area so as to surround the active area,
A portion of the first surface of the unit base material corresponding to the inactive area of the display panel is a portion of the first surface of the unit base material corresponding to the active area of the display panel. An inclined surface inclined toward the second surface side of the unit base material is formed at least partially,
The cover glass in which the inclined surface which spreads on the same plane as the said inclined surface of the said 1st surface of the said unit base material is formed in the said 1st surface of the said reinforcement part.   The cover glass according to claim 19, wherein a step between the inclined surface of the first surface of the unit base material and the inclined surface of the first surface of the reinforcing portion is 2 μm or less. The unit base material includes at least a compressive stress layer formed on the first surface and the second surface, and the compressive stress layer on the first surface side and the compressive stress layer on the second surface side. A tensile stress layer located,
The cover glass according to claim 19 or 20, wherein the inclined surface of the first surface of the unit base material is configured so that the tensile stress layer is not exposed to the inclined surface. A method of manufacturing a cover glass provided on the viewer side of the display device,
A preparatory step of preparing a unit base material made of glass, including a first surface on the viewer side, a second surface opposite to the first surface, and a side surface extending between the first surface and the second surface. When,
A reinforcing part forming step for forming a reinforcing part containing a resin material on the side surface of the unit base material,
A polishing step of polishing the first surface of the unit base material and the reinforcing portion,
The reinforcing portion after passing through the polishing step extends from the end of the first surface of the unit base material to the side, and from the end of the second surface of the unit base material to the side. A second surface, and a tip portion extending between the first surface and the second surface of the reinforcing portion,
The display device includes a display panel including an active area capable of displaying an image and an inactive area disposed outside the active area so as to surround the active area,
In the portion corresponding to the inactive area of the display panel in the first surface of the unit base material after the polishing step, the active part of the display panel in the first surface of the unit base material is formed. An inclined surface inclined toward the second surface side of the unit base material is formed at least partially with respect to a portion corresponding to an area,
The said grinding | polishing process is implemented so that the inclined surface which spreads on the same surface as the said inclined surface of the said 1st surface of the said unit base material may be formed in the said 1st surface of the said reinforcement part. . The preparation step includes
Preparing a base material including a first surface and a second surface opposite to the first surface;
A protective film forming step of providing a first protective film and a second protective film in a predetermined plurality of sections on the first surface and the second surface of the substrate;
A cutting step of obtaining a unit laminate body by cutting the base material along a gap between the first protective film and the second protective film provided in each section, wherein the unit laminate body has a first surface A unit base material made of glass, including a second surface opposite to the first surface, and a side surface extending between the first surface and the second surface, and on the first surface of the unit base material A cutting step having the first protective film provided and the second protective film provided on the second surface,
The reinforcing part forming step includes
On the side surface of the unit base material, an application step of applying a coating liquid containing a resin material,
Curing the coating liquid on the side surface of the unit base material, and forming a reinforcing portion on the side surface of the unit base material, and
In the cutting step, the base material is cut from the first surface side and the second surface side of the base material by wet etching the base material using the first protective film and the second protective film as a resist. As a result, the first protective film protrudes laterally from the first surface of the unit base material, and the second protective film is from the second surface of the unit base material. Also protrudes sideways,
23. The method for manufacturing a cover glass according to claim 22, wherein, in the coating step, the coating solution is applied to a side surface of the unit base material, a space surrounded by the first protective film and the second protective film. .