JP6460467B2 - Cover glass and display device with cover glass - Google Patents

Description

  The present invention relates to a cover glass provided on an observer side of a display device. The present invention also relates to a display device provided 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 a resin on the side surface of the cover glass. For example, Patent Document 2 proposes that at least a part of a side surface of a cover glass is covered with a polymer coating.

JP 2012-88946 A Special table 2012-527399 gazette

  In general, the higher the hardness of the coating provided on the side surface of the cover glass, the higher the scratch resistance of the side surface of the cover glass. On the other hand, it can be considered that the higher the hardness of the coating, the lower the handleability of the material constituting the coating. For example, it is conceivable that the coating hardly adheres to the glass or that the thickness of the coating on the glass side surface cannot be sufficiently secured.

  The present invention has been made in consideration of such points, and an object thereof is to provide a cover glass reinforced with a material having high handling properties and hardness and a display device with a cover glass.

  1st this invention is the cover glass provided in the observer side of a display apparatus, Comprising: The 1st surface which faces the display apparatus side, the 2nd surface on the opposite side of the said 1st surface, and the said 1st surface A unit base material made of glass, including a side surface extending between the second surface, a decorative portion provided on the first surface of the unit base material and exhibiting a predetermined color, and at least of the unit base material A reinforcing portion made of a resin material provided on the side surface, and the reinforcing portion and the decorative portion are arranged so as to be continuously visible when viewed from the observer side of the cover glass. The reinforcing portion is a cover glass that includes a resin and is configured to exhibit a predetermined color.

  The cover glass by 1st this invention WHEREIN: The said reinforcement part may be comprised so that the color of the same color as the color which the said decoration part exhibits may be exhibited.

  In the cover glass according to the first aspect of the present invention, the reinforcing portion may further include a plurality of fillers dispersed in the resin and exhibiting a predetermined color.

In the cover glass according to the first aspect of the present invention, preferably, the universal hardness of the reinforcing portion is in a range of 500 to 750 N / mm ² .

  In the cover glass according to the first aspect of the present invention, the filler may contain carbon black, titanium oxide, or titanium nitride.

  In the cover glass according to the first aspect of the present invention, the filler content in the reinforcing portion may be in the range of 0.1 to 15% by weight.

  In the cover glass according to the first aspect of the present invention, the resin of the reinforcing portion may be configured to exhibit a predetermined color.

  In the cover glass according to the first aspect of the present invention, the reinforcing portion may further include a dye added to the resin and exhibiting a predetermined color.

2nd this invention is the cover glass provided in the observer side of a display apparatus, Comprising: The 1st surface which faces the display apparatus side, the 2nd surface on the opposite side of the said 1st surface, and the said 1st surface A unit base material made of glass, including a side surface extending between the second surface and a reinforcing part made of a resin material provided on at least the side surface of the unit base material, wherein the reinforcing part is a binder A cover glass comprising a resin and a plurality of fillers dispersed in a binder resin, wherein the reinforcing part has a universal hardness in the range of 500 to 750 N / mm ² .

  In the cover glass according to the second aspect of the present invention, the filler may contain silicon oxide.

  In the cover glass according to the second aspect of the present invention, the filler content in the reinforcing portion may be in the range of 1 to 15% by weight.

  In the cover glass according to 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 side. A tensile stress layer positioned between the compressive stress layer and the tensile stress layer may be exposed on the side surface of the unit base material.

  In the cover glass according to the present invention, at least a part of the touch panel sensor unit may be provided on the first surface of the unit base material.

  In the cover glass according to the present invention, the reinforcing portion may include a surface extending laterally from an end portion of the second surface of the unit base material on the same plane as the second surface of the unit base material. .

  This invention is a display apparatus with a cover glass provided with a display apparatus and the cover glass arrange | positioned at the observer side of the said display apparatus, and the said cover glass consists of the cover glass of the said description.

  According to 1st this invention, the reinforcement part provided on the at least side surface of the unit base material which consists of glass contains resin, and is comprised so that a predetermined color may be exhibited. Moreover, a reinforcement part is arrange | positioned so that it may be visually recognized continuously with the decoration part which exhibits a predetermined color. For this reason, a reinforcement part can function so that the designability of a cover glass may be improved with a decoration part. Therefore, according to 1st this invention, the cover glass excellent in intensity | strength and the designability can be provided.

According to 2nd this invention, the reinforcement part provided on the at least side surface of the unit base material which consists of glass contains binder resin and the some filler disperse | distributed in binder resin. For this reason, the hardness of a reinforcement part can be adjusted by setting the hardness of a filler appropriately. Therefore, the hardness of the reinforcing portion can be in the range of 500 to 750 N / mm ² while maintaining high handling properties.

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 a touch panel sensor unit provided on the cover glass of FIG. 1. FIG. 3 is a cross-sectional view of the cover glass of FIG. 2 along the line III. 4 is a cross-sectional view of the cover glass of FIG. 2 taken along line IV. FIG. 5 is an enlarged cross-sectional view illustrating a side surface of the cover glass of FIG. 3. FIG. 6A is a diagram showing a part of a step of forming a unit intermediate having a unit substrate and a protective film using a substrate made of large tempered glass. FIGS. 6B (a) and 6 (b) are diagrams showing a part of a step of forming a unit intermediate having a unit base material and a protective film using a base material made of large tempered glass. FIG. 6C is a diagram showing a part of a step of forming a unit intermediate having a unit substrate and a protective film using a substrate made of large tempered glass. FIG. 7 is a view showing a part of a process of obtaining a cover glass whose side surfaces are reinforced by providing a resin on the side surface of the unit base material of the unit intermediate. FIG. 8A is a diagram showing a part of a process for producing a cover glass according to a comparative embodiment. FIG. 8B is a diagram showing a part of a process for producing a cover glass according to a comparative embodiment. FIG. 9 is a cross-sectional view showing a cover glass in a first modification of the first embodiment. FIG. 10 is a cross-sectional view showing a cover glass in a second modification of the first embodiment. FIG. 11A is a cross-sectional view showing a unit intermediate in the third modification of the first embodiment. FIG. 11B is a cross-sectional view showing a state in which the coating liquid is applied on the side surface of the unit base material of the unit intermediate shown in FIG. 11A. FIG. 11C is a cross-sectional view showing a state in which the coating liquid overflowing from the unit intermediate shown in FIG. 11B is scraped off. FIG. 11D is a cross-sectional view showing a cover glass according to a third modification of the first embodiment. FIG. 12A is a diagram showing a part of a step of forming a unit intermediate having a unit base material and a protective film in the fourth modification example of the first embodiment. FIG. 12B is a diagram showing a part of a step of forming a unit intermediate having a unit base material and a protective film in the fourth modification example of the first embodiment. FIG. 12C is a diagram showing a part of a step of forming a unit intermediate having a unit base material and a protective film in the fourth modification example of the first embodiment. FIG. 13A is a diagram illustrating a part of a step of forming a reinforcing portion on a side surface of a unit base material of a unit intermediate in the fourth modification example of the first embodiment. FIG. 13B is a diagram illustrating a part of a step of forming a reinforcing portion on the side surface of the unit base material of the unit intermediate body in the fourth modification example of the first embodiment. FIG. 13C is a diagram showing a part of a step of forming a reinforcing portion on a side surface of a unit base material of a unit intermediate in the fourth modification example of the first embodiment. FIG. 14 is a cross-sectional view showing a cover glass in the second embodiment of the present invention. FIG. 15 is a view showing a measuring instrument used for measuring the bending strength of a cover glass. FIG. 16 is a plan view showing a cover glass in a sixth modification of the first embodiment. FIG. 17 is a diagram illustrating an example of a method of forming a reinforcing portion in the sixth modification example of the first embodiment.

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 display device side of the cover glass 20 is represented by reference numeral 20a, and the surface (second surface) on the observer side is represented by reference numeral 20b.

  In the present embodiment, the cover glass 20 is configured not only to protect the display device 15 but also to perform a touch panel function. Specifically, on the first surface 20a of the cover glass 20 on the display device 15 side, a touch panel sensor unit 40 including a sensor electrode for detecting the approach or contact of the external conductor is provided. The inactive area Aa2 on the first surface 20a of the cover glass 20 is further provided with a decorating portion 60 that exhibits a predetermined color.

(Touch panel sensor)
Next, the touch panel sensor unit 40 provided on the first surface 20a of the cover glass 20 will be described with reference to FIG. FIG. 2 is a plan view showing the cover glass 20 as viewed from the first surface 20a side. In FIG. 2, the decorating unit 60 is omitted for convenience of explanation. The touch panel sensor unit 40 shown in FIG. 2 is configured as a projection-type capacitive coupling method, and detects a contact position (also referred to as a touch position) of an external conductor (for example, a human finger) to the touch panel sensor unit 40. It is configured to be possible.

  As shown in FIG. 2, the first surface 20a of the cover glass 20 corresponds to the active area Aa1 corresponding to the active area A1 and the inactive area A2 of the display panel 16, and the active area Aa1 corresponding to the area where the touch position can be detected. It is partitioned into an inactive area Aa2 located around the area Aa1. In addition, the touch panel sensor unit 40 is connected to the plurality of sensor electrodes 41 and 42 disposed in the active area Aa1 and the corresponding sensor electrodes 41 and 42, and is disposed in the inactive area Aa2 of the cover glass 20. The lead-out wiring 43 and a plurality of terminal portions 44 connected to the corresponding lead-out wiring 43 are provided.

  As shown in FIG. 2, the sensor electrodes 41 and 42 include a plurality of first sensor electrodes 41 extending along the first direction D1, and a plurality of second electrodes extending along a second direction D2 orthogonal to the first direction D1. Sensor electrode 42. The first sensor electrode 41 may include a first line portion 41a that extends linearly along the first direction D1, and a first bulge portion 41b that bulges from the first line portion 41a. Similarly, the 2nd sensor electrode 42 may have the 2nd line part 42a extended along the 2nd direction D2, and the 2nd bulge part 42b bulged from the 2nd line part 42a.

  The lead-out wiring 43 is provided in the inactive area Aa2 in order to transmit the signals detected by the corresponding sensor electrodes 41 and 42 to the terminal portion 44. The signal transmitted to the terminal unit 44 by the extraction wiring 43 is transmitted to the detection control unit via a flexible substrate (not shown) attached to the terminal unit 44.

(Layer structure of cover glass, touch panel sensor and decoration)
Next, with reference to FIG. 3 thru | or FIG. 5, the layer structure of the touchscreen sensor part 40 and the decorating part 60 provided in the 1st surface 20a of the cover glass 20 and the cover glass 20 is demonstrated. 3 and 4 are cross-sectional views taken along line III and line IV, respectively, of the cover glass 20 shown in FIG. FIG. 5 is an enlarged sectional view showing the vicinity of the side surface 20c of the cover glass 20 of FIG.

  First, the layer configuration of the components arranged in the active area Aa1 of the cover glass 20 will be described. As shown in FIGS. 3 and 4, the first line portion 41 a, the first bulge portion 41 b, and the second bulge portion 42 b of the touch panel sensor unit 40 may be formed on the same plane. In this case, the first line portion 41a, the first bulging portion 41b, and the second bulging portion 42b are simultaneously formed by patterning the transparent conductive layer 51 made of a transparent conductive material such as indium tin oxide (ITO). It is possible.

  As shown in FIGS. 3 and 4, the first line portion 41 a and the second line portion 42 a are formed so as to partially overlap each other when viewed from the normal direction of the cover glass 20. In this case, by interposing the insulating layer 47 between the first line portion 41a and the second line portion 42a, conduction between the first line portion 41a and the second line portion 42a can be prevented. . Although not shown, the insulating layer 47 is provided not only between the first line portion 41a and the second line portion 42a but also on the first bulge portion 41b and the second bulge portion 42b. Also good.

  As long as the 2nd line part 42a has electroconductivity, the material which comprises the 2nd line part 42a is not specifically limited. For example, the second line portion 42a may be made of a transparent conductive material such as indium tin oxide (ITO) like the first line portion 41a, the first bulge portion 41b, and the second bulge portion 42b. Alternatively, it may be made of an impermeable conductive material such as a silver alloy or copper. In the present embodiment, an example in which the second line portion 42 a is configured by the metal layer 52 that is also included in the lead-out wiring 43 and the terminal portion 44 will be described.

  Next, the layer configuration of the components arranged in the inactive area Aa2 of the cover glass 20 will be described. As shown in FIGS. 3 and 4, in the inactive area Aa <b> 2, the decorating part 60 is arranged so as to be positioned closer to the viewer than the above-described extraction wiring 43. In this case, the decoration part 60 is visually recognized through the cover glass 20 from the user who exists in the observer side. That is, in the display device 10 with the cover glass, the appearance of the inactive area Aa2 is determined by the decorating unit 60 and its peripheral components.

  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

  Next, the configuration of the cover glass 20 will be described. As shown in FIGS. 3 and 4, the cover glass 20 includes a unit base material 22 and a reinforcing portion 26. The unit base material 22 is made of glass, and the reinforcing portion 26 is made of a resin material. The unit base member 22 includes a first surface 22a on the display device side, a second surface 22b opposite to the first surface 22a, and a side surface 22c extending between the first surface 22a and the second surface 22b. Yes. Moreover, as shown in FIG. 5, the decoration part 60 is the 1st surface 60a by the side of a display apparatus, the 2nd surface 60b which faces the 1st surface 22a of the unit base material 22, and the 1st surface 60a and the 2nd surface. The side surface 60c extended between 60b is included. And the reinforcement part 26 is provided so that the side surface 22c of the unit base material 22 and the side surface 60c of the decorating part 60 may be contact | connected.

  As will be described later, the unit base material 22 is obtained by dividing the base material 30 made of large tempered glass into pieces. As shown in FIG. 5, 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 high durability with respect to an impact. As a material constituting the unit base member 22, for example, aluminosilicate glass can be used.

  On the other hand, as shown in FIG. 5, 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 26 described above can play a role of protecting the side surface 22c of the unit base material 22 as described above.

  Although the thickness of the unit base material 22 is appropriately set according to the required strength, the area of the cover glass 20, and the like, it is within a range of, for example, 0.1 mm to 1 mm. Moreover, although the thickness of the compressive stress layer 24a of the unit base material 22 is appropriately set according to the required strength, the cutting property required when cutting the base material 30 described later, etc., for example, 10 to 50 μm It is within range.

  Next, the reinforcing part 26 will be described in detail. As shown in FIG. 5, the reinforcing portion 26 has a side surface 26 c that overlaps the side surface 22 c of the unit base material 22 and the side surface 60 c of the decorating portion 60 when viewed along the normal direction of the side surface 22 c of the unit base material 22. Contains. In addition, the reinforcing portion 26 has a first surface 26 a extending from the end portion 60 ae of the first surface 60 a to the side on the same plane as the first surface 60 a of the decorative portion 60 and / or the second surface of the unit base material 22. A second surface 26b may be included that extends laterally from the end 22be of the second surface 22b on the same plane as 22b. When the reinforcing portion 26 includes the first surface 26 a and the second surface 26 b, there is no or almost no step between the reinforcing portion 26 and the decorative portion 60 and / or the unit base material 22. For this reason, it can suppress that the boundary between the reinforcement part 26, the decoration part 60, and / or the unit base material 22 is visually recognized by an observer. Therefore, ensuring of the strength of the side surface 20c of the cover glass 20 by the reinforcing portion 26 and ensuring of the design property of the cover glass 20 can be achieved at the same time. In addition, the operational feeling of the touch panel is not hindered by the steps.

  Moreover, the reinforcement part 26 can also play the role of suppressing that the sharp edge part 22be by the side of the 2nd surface 22b of the unit base material 22 is exposed. For this reason, when manufacturing the display apparatus 10 combining the cover glass 20 with the display apparatus 15, it can suppress that an operator's hand touches the edge part 22be and a hand is injured. In addition, when the display device 10 has a touch panel function as in the present embodiment, it is possible to prevent the user's hand from touching the end 22be when the touch panel is operated and hurting the hand.

FIG. 5 shows an example in which the side surface 22c of the unit base member 22 is configured as a flat surface that extends substantially flat between the first surface 22a and the second surface 22b. However, the shape of the side surface 22c is not limited to a flat surface. For example, the side surface 22c may be a curved surface. Further, the side surface 22c may be configured as a combination of a plurality of surfaces extending in various directions. In this case, the “normal direction of the side surface 22c” may be defined as a normal direction of a virtual plane orthogonal to at least one of the first surface 22a or the second surface 22b.
Similarly to the side surface 22c of the unit base member 22, the form of the side surface 60c of the decorative portion 60 is not limited to a flat surface.

5, covering the dimensions of the reinforcing portion 26 on the side surface 22c of the unit base 22 (initial coating size) is represented by the symbol T _0. The covering dimension T ₀ of the reinforcing portion 26 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. For example, the covering dimension T ₀ of the reinforcing portion 26 is set to 50 μm or more, more preferably 100 μm or more. On the other hand, if the covering dimension T ₀ of the reinforcing portion 26 becomes too large, it is considered that the reinforcing portion 26 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 covering dimension T ₀ of the reinforcing portion 26 is set to 500 μm or less, for example.

  Next, the material which comprises the reinforcement part 26 is demonstrated.

  As shown in FIG. 5, the reinforcing part 26 includes a binder resin 28a and a plurality of fillers 28b dispersed in the binder resin 28a. The filler 28b is inorganic or organic fine particles arranged to enhance the function of the reinforcing portion 26. By forming the reinforcing part 26 using the filler 28b, in addition to the characteristic based on the binder resin 28a, the characteristic based on the filler 28b can be imparted to the reinforcing part 26. For example, by dispersing the hard filler 28b in the binder resin 28a having excellent moldability and adhesion, the reinforcing portion 26 having excellent moldability and adhesion and having sufficient mechanical strength can be obtained. Can be obtained.

Preferably, the reinforcement part 26 is comprised so that the universal hardness may be in the range of 500-750 N / mm < ² >. For example, the universal hardness can be achieved by adjusting the material constituting the filler 28b and the content of the filler 28b in the reinforcing portion 26. For example, the content of the filler 28b in the reinforcing portion 26 is set within a range of 0.1 to 15% by weight. By realizing the above universal hardness, it is possible to prevent the reinforcing portion 26 from being damaged when an external force resulting from an impact or the like is applied to the reinforcing portion 26.

  The universal hardness of the reinforcing part 26 can be measured by a test method defined in DIN 50359, for example.

  Moreover, in this Embodiment, as the filler 28b of the reinforcement part 26, what is not a colorless and transparent thing and can exhibit a predetermined color is used. Accordingly, the reinforcing portion 26 in which the filler 28b is dispersed is also visually recognized by the observer as exhibiting a predetermined color. Thus, in the present embodiment, the filler 28 b can not only provide mechanical strength to the reinforcing portion 26, but also can provide design properties to the reinforcing portion 26.

  The material constituting the filler 28 b is appropriately set according to the color required for the reinforcing portion 26. For example, when the filler 28b contains carbon black, the reinforcement part 26 can exhibit black. The average value of the particle diameter of the filler 28b containing carbon black is in the range of 0.01 to 0.1 μm, for example. Moreover, when the filler 28b contains a titanium oxide, the reinforcement part 26 can exhibit white. The average value of the particle diameter of the filler 28b containing titanium oxide is in the range of 0.01 to 2.0 μm, for example. Moreover, when the filler 28b contains titanium nitride, the reinforcement part 26 can exhibit black. The average value of the particle diameter of the filler 28b containing titanium nitride is in the range of 0.01 to 0.1 μm, for example.

  By the way, as described above, the reinforcing portion 26 is provided in contact with the side surface 60 c of the decorative portion 60. For this reason, when the reinforcement part 26 and the decoration part 60 are seen from the observer side of the cover glass 20, the reinforcement part 26 and the decoration part 60 are mutually visually recognized continuously. That is, when the cover glass 20 is viewed from the observer side, the color presented by the decorating unit 60 and the color presented by the reinforcing unit 26 are continuously visible without a gap. For this reason, compared with the case where the reinforcement part 26 is a colorless and transparent thing, the range of the non-active area Aa2 which can exhibit a desired color can be expanded more outside. As a result, design properties such as prevention of light leakage from the outer peripheral portion of the cover glass 20 can be improved.

  The reinforcement part 26 may be comprised so that the color of the same color as the color which the decorating part 60 exhibits may be exhibited. For example, the filler 28b is selected so that the color that the filler 28b of the reinforcing portion 26 exhibits is the same color as the color that the decorative portion 60 exhibits. Thereby, the range of the non-active area Aa2 that can exhibit the same color can be expanded outward.

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.

  As the binder resin 28a of the reinforcing portion 26, a UV curable resin material such as an acrylic resin, a thermosetting resin such as an epoxy resin, a urethane resin, or the like can be used.

(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. 6A to 7.

  First, with reference to FIGS. 6A to 6C, a process of forming the unit intermediate 35 including the unit base material 22 in which the base material 30 is divided based on the base material 30 made of large tempered glass will be described. 6A, 6B (a), and 6C are cross-sectional views showing the base material 30 in this step. FIG. 6B (b) is a plan view showing the base material 30 in this step.

  First, as shown to FIG. 6A, the base material 30 which consists of a large tempered glass is prepared. The base material 30 includes a first surface 30a, a second surface 30b on the opposite side of the first surface 30a, and a side surface 30c extending between the first surface 30a and the second surface 30b. As shown in FIG. 6A, a compressive stress layer 24a is formed on the first surface 30a, the second surface 30b, and the side surface 30c of the base material 30, and a tensile stress layer 24b exists inside the compressive stress layer 24a. doing. Thus, the entire surface of the base material 30 is formed by the compressive stress layer 24a.

  Next, as shown to FIG. 6B (a) (b), on the 1st surface 30a of the base material 30, the decoration part 60 and the touchscreen sensor part 40 are formed in a predetermined some division (element part formation process). . For example, in FIG. 6B (b), each of the six sections obtained by dividing the first surface 30a of the base material 30 into two rows in the vertical direction of the paper and dividing into three rows in the horizontal direction of the paper is decorated. Part 60 and touch panel sensor part 40 are formed. The number of sections of the base material 30 is not particularly limited. As a method of forming the decorating unit 60 and the touch panel sensor unit 40 on the first surface 30a side, a known method is appropriately used, and for example, a photolithography method is used. In the following description, the touch panel sensor unit 40 and the decorating unit 60 may be collectively referred to as an element unit 70.

  Then, as shown to FIG. 6C, the cutting process which cut | disconnects the base material 30 along each division of the base material 30 is implemented. Although the method in particular of cutting the base material 30 is not restricted, For example, the base material 30 can be cut | disconnected by the process using a laser. In this way, the unit intermediate 35 including the unit base material 22 can be obtained. In addition, in order to ensure the flatness and specularity of the cut surface of the base material 30 (side surface 22c of the unit base material 22), the cut surface of the base material 30 may be prepared by etching or polishing after cutting.

  Next, a process of obtaining the cover glass 20 whose side surfaces are reinforced by providing reinforcing portions (resin or the like) on the side surfaces 22c of the unit base member 22 of the unit intermediate 35 will be described with reference to FIG.

  First, an application process is performed in which the application liquid 27 containing a curable material such as an ultraviolet curable resin or a thermosetting resin is applied onto the side surface 22c and the side surface 60c of the unit base member 22. Here, the case where the coating liquid 27 containing the binder resin 28a which consists of acrylic resin, the filler 28b, and a photoinitiator is used is demonstrated.

  In the coating process, the unit base material 22 is held so that the side surface 22c on which the coating liquid 27 is coated faces upward. In this state, the coating liquid 27 is applied onto the predetermined side surface 22c of the unit base 22 and the side surface 60c of the decorating unit 60 by using a dispenser method, a roll coating method, or the like. Thereafter, the coating liquid 27 is cured by performing a curing process in which the coating liquid 27 is irradiated with light such as ultraviolet rays. Thereby, the reinforcing portion 26 is formed on the predetermined side surface 22 c of the unit base material 22. By performing these coating steps and curing steps on all the side surfaces 22c, as shown in FIG. 7, the unit base material 22, the side surface 22c of the unit base material 22, and the side surface 60c of the decorating part 60 The cover glass 20 provided with the provided reinforcement part 26 can be obtained.

  According to the present embodiment, the reinforcing portion 26 including the binder resin 28 a and the plurality of fillers 28 b dispersed in the binder resin 28 a is provided on the side surface 22 c of the unit base material 22. For this reason, the hardness of the reinforcement part 26 can be adjusted by setting the hardness of the filler 28b appropriately. Accordingly, it is possible to sufficiently increase the hardness of the reinforcing portion 26 while maintaining high handleability, thereby suppressing the occurrence of damage such as cracks on the side surface 22c of the unit base member 22. Thereby, even if the compressive stress layer is not formed on the side surface 22c of the unit base material 22, durability such as impact resistance of the cover glass 20 can be sufficiently increased.

  In the present embodiment, as the filler 28b of the reinforcing portion 26, a material exhibiting a predetermined color as described above is used. Moreover, the reinforcement part 26 is arrange | positioned so that it can visually recognize continuously with the decoration part 60 which exhibits a predetermined color. For this reason, the reinforcement part 26 can function so that the designability of the cover glass 20 can be improved with the decoration part 60. FIG. Therefore, according to this Embodiment, the cover glass 20 excellent in intensity | strength and the designability can be provided.

  Moreover, according to this Embodiment, since the side surface 20c of the cover glass 20 is comprised by the reinforcement part 26 which consists of resin, compared with the case where the side surface 20c of the cover glass 20 is comprised with glass, it is a cover. The edge portion of the side surface 20c of the glass 20 does not need to be subjected to laceration prevention processing such as chamfering.

The comparative embodiment Next, the effect of this embodiment will be described in comparison with a comparative embodiment. FIG. 8A and FIG. 8B are diagrams showing a process of manufacturing the cover glass 120 in the comparative form. In addition, the reinforcement part 126 by the comparison form does not contain a filler or a color pigment.

  In the comparative form, as described above, the reinforcing portion 126 contains no filler or colored pigment. For this reason, in order to expand the region that can exhibit a predetermined color to the outside, as shown in FIG. 8B, after the reinforcing portion 126 is provided on the side surface 22c of the unit base material 22 as shown in FIG. 8A. It is necessary to further carry out the step of providing the additional decoration part 62 outside the decoration part 60 that has already been provided.

  On the other hand, according to the above-described embodiment, the reinforcing portion 26 includes the filler 28b exhibiting a predetermined color. For this reason, not only the decoration part 60 but the reinforcement part 26 can also contribute to the designability of the cover glass 20. FIG. Therefore, by arranging the reinforcing portion 26 and the decorating portion 60 so that the reinforcing portion 26 and the decorating portion 60 are continuously visually recognized, the cover glass 20 having excellent design properties can be obtained with less man-hours. Can do. For this reason, the cost required for producing the cover glass 20 can be reduced.

  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)
As shown in FIG. 9, the reinforcing portion 26 includes not only the side surface 22 c of the unit base material 22 and the side surface 60 c of the decorating portion 60, but also a part of the second surface 22 b of the unit base material 22 and the first decorating portion 60. You may provide so that a part of surface 60a may be covered. In this case, since the reinforcement part 26 and the decoration part 60 partially overlap when viewed along the normal direction of the first surface 22a of the unit base member 22, the reinforcement part 26 and the decoration part 60 are continuous. Become visible. Such a reinforcement part 26 can be produced by providing the above-mentioned coating liquid 27 on the side surface 22c of the unit base material 22 and the side surface 60c of the decorating part 60 by, for example, a dip coating method.

(Second modification)
In the present embodiment described above, the element part forming step for forming the element part 70 including the decorating part 60 and the touch panel sensor part 40 on the first surface 30a of the base material 30 cuts the base material 30 and is a unit. The example implemented prior to the process of forming the intermediate body 35 and the process of forming the reinforcement part 26 in the side surface 22c of the unit base material 22 of the unit intermediate body 35 was shown. However, the present invention is not limited to this, and the step of cutting the base material 30 may be performed on the base material 30 in a state where the touch panel sensor unit 40 is not provided but the decoration unit 60 is provided. Good. As shown in FIG. 10, even if the cover glass 20 is obtained by forming the reinforcing portion 26 on the side surface 22 c of the unit base member 22 and the side surface 60 c of the decoration unit 60 in a state where the touch panel sensor unit 40 is not provided. Good. Thereafter, the touch panel sensor unit 40 may be formed on the first surface 20 a of the cover glass 20. Alternatively, the touch panel sensor unit 40 may be formed separately and combined with an adhesive or the like to form the cover glass 20 and then combined with the display device 15.

(Third Modification)
In the present modification, the first protective film 81 and the second protective film 82 provided on the first surface 22a and the second surface 22b of the unit base material 22 are used, and on the side surface 22c of the unit base material 22 and The example which forms the reinforcement part 26 with the high external dimension precision on the side surface 60c of the decorating part 60 is demonstrated.

  First, as shown in FIG. 11A, on the unit base material 22, the first protective film 81 provided on the element part 70 on the first surface 22 a of the unit base material 22, and the second surface 22 b of the unit base material 22. A unit intermediate 35 having the provided second protective film 82 is prepared. The 1st protective film 81 is comprised so that it may protrude to the side rather than the 1st surface 60a of the decorating part 60, and the 2nd protective film 82 is a side rather than the 2nd surface 22b of the unit base material 22. It is comprised so that it may protrude in the direction. The first protective film 81 and the second protective film 82 may be provided before the base material 30 is cut to obtain the unit base material 22, or the base material 30 is cut and the unit base material is cut. It may be provided after obtaining 22. As a material constituting the first protective film 81 and the second protective film 82, for example, biaxially stretched polypropylene or unstretched polypropylene having a thickness of about 50 to 100 μm can be used.

  In the example shown in FIG. 11A, the shape of the first protective film 81 cannot follow the shape of the decorative portion 60 on the unit base member 22, and as a result, the first protective film 81 and the unit base member 22 have the first shape. A gap is formed between the first surface 22a. Such a gap is formed when the thickness of the decorative portion 60 is large (for example, when the decorative portion 60 is a white object), or the side surface 60c of the decorative portion 60 and the end surface 81c of the first protective film 81. It can be formed when the distance to is short.

  Next, as shown in FIG. 11B, the coating liquid 27 is filled in the space surrounded by the side surface 22c of the unit base member 22, the side surface 60c of the decorative portion 60, the first protective film 81, and the second protective film 82. Perform the process. As shown in FIG. 11B, the coating liquid 27 may be applied to the extent that it overflows also onto the end surface 81 c of the first protective film 81 and the end surface 82 c of the second protective film 82.

  Thereafter, the coating liquid 27 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. 11C, the surface of the coating liquid 27 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.

  Next, the hardening process which hardens the coating liquid 27 provided on the side surface 22c of the unit base material 22 is implemented. For example, the coating liquid 27 is cured by irradiating the coating liquid 27 with light such as ultraviolet rays. Thereby, the reinforcement part 26 is formed on the side surface 22c of the unit base material 22 and the side surface 60c of the decorating part 60.

  Thereafter, the first protective film 81 and the second protective film 82 are removed. 11D, the cover glass 20 provided with the unit base material 22 and the reinforcement part 26 provided on the side surface 22c of the unit base material 22 and the side surface 60c of the decoration part 60 is obtained. be able to.

  According to this modification, as described above, the reinforcing portion 26 is laterally formed from the first protective film 81 projecting laterally from the first surface 60a of the decorative portion 60 and the second surface 22b of the unit base material 22. It is formed in a space positioned by the protruding second protective film 82. For this reason, as shown to FIG. 11D, the 1st surface 26a located on the same plane as the 1st surface 60a of the decorating part 60, and the 2nd surface located on the same plane as the 2nd surface 22b of the unit base material 22 26b can be obtained more reliably. That is, the step between the reinforcing portion 26 and the decorative portion 60 and / or the unit base material 22 can be eliminated more reliably, or the step can be further reduced. For this reason, it can further suppress that the boundary between the reinforcement part 26, the decoration part 60, and / or the unit base material 22 is visually recognized by an observer. Moreover, it can further suppress that the operation | work which manufactures the display apparatus 10 combining the cover glass 20 with the display apparatus 15, and the operation feeling of a touchscreen will be inhibited by the level | step difference.

  In the present modification, as described above, the coating liquid 27 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 with a squeegee or the like, A side surface 26c of the reinforcing portion 26 is leveled. For this reason, in the reinforcing part 26 obtained by curing the coating liquid 27, the position of the end part 26ae of the first surface 26a coincides with the position of the end face 81c of the first protective film 81. Similarly, the position of the end portion 26be of the second surface 26b of the reinforcing portion 26 matches the position of the end surface 82c of the second protective film 82. Thus, according to the present embodiment, the position of the end portion 26ae of the first surface 26a and the position of the end portion 26be of the second surface 26b of the reinforcing portion 26 are set to the positions of the end surfaces 81c and 82c of the protective films 81 and 82. Can be determined based on Therefore, the positions of the end portions of the cover glass 20 can be accurately determined by precisely determining the positions of the end surfaces 81c and 82c of the protective films 81 and 82. Thereby, when the cover glass 20, the display device 15, and the case are assembled, the ease of the process and the yield can be increased. Moreover, when the decoration part 60 and the touchscreen sensor part 40 are provided in the cover glass 20 like this Embodiment, the processing precision of the decoration part 60 and the touchscreen sensor part 40 with respect to the display apparatus 15 can also be raised. Thereby, the high designability and operativity of the display apparatus 10 with a cover glass are realizable.

(Fourth modification)
In this modification, the first protective film 81 and the second protective film 82 described above also function as a resist that protects the element portion 70 when the substrate 30 is divided by wet etching using hydrofluoric acid or the like. Will be described.

  First, the base material 30 provided with the element part 70 is prepared in the same manner as in the case of the above-described embodiment shown in FIGS. 6A and 6B (a) and (b). Next, the protective film formation process which provides the 1st protective film 81 and the 2nd protective film 82 in a predetermined some division on the 1st surface 30a and the 2nd surface 30b of the base material 30 is implemented. First, as shown in FIG. 12A, a first protective film 81 is provided on the first surface 30 a of the base material 30 so as to continuously cover the element portions 70 respectively provided in the plurality of sections. A second protective film 82 is provided on the second surface 30 b of the substrate 30. In the example shown in FIG. 12A, as long as the first protective film 81 and the second protective film 82 have resistance to the etching solution used for dividing the first base material 30 of the base material 30, the protective film 81, The material constituting 82 is not particularly limited. For example, as the material constituting the protective films 81 and 82, biaxially stretched polypropylene or unstretched polypropylene having a thickness of about 50 to 100 μm can be used as in the case of the third modified example. In this case, for example, the protective film 81 is formed by sticking a biaxially stretched polypropylene sheet or an unstretched polypropylene sheet on the first surface 30a and the second surface 30b of the substrate 30 through an adhesive layer having a thickness of about 20 μm. , 82 are configured.

  Thereafter, as shown in FIGS. 12B (a) and 12 (b), the first protective film 81 and the second protective film 82 provided over the entire area of the first surface 30a and the second surface 30b are replaced with the first surface 30a and the second protective film 82, respectively. Dividing into sections of the two surfaces 30b. As a result, a gap is formed along the boundary of each partition in the first protective film 81 covering each element portion 70 and the corresponding second protective film 82.

  A specific method for dividing the first protective film 81 and the second protective film 82 is not particularly limited, and various methods can be adopted. For example, unnecessary portions (portions that become gaps) of the first protective film 81 may be removed using a mold having a shape corresponding to the shape of the first protective film 81 shown in FIG. 12B (b). Also on the second surface 30b side, by using a mold having a shape corresponding to the mold for the first protective film 81, unnecessary portions (portions that become gaps) of the second protective film 82 can be removed. In addition, unnecessary portions of the first protective film 81 and the second protective film 82 may be removed using laser processing.

  Thereafter, as shown in FIG. 12C (a), a cutting step is performed in which the base material 30 is cut along the gap between the first protective film 81 and the second protective film 82 provided in each section of the base material 30. Specifically, the base material 30 is wet-etched from the first surface 30a side and the second surface 30b side of the base material 30 by using the first protective film 81 and the second protective film 82 as resists, thereby removing the base material 30. Disconnect. As the etching solution, hydrofluoric acid or the like can be used as described above. Accordingly, as shown in FIG. 12C (a), the unit base 22 made of glass, the element part 70 provided on the first surface 22a side of the unit base 22, and the first surface 22a of the unit base 22 The unit intermediate body 35 having the first protective film 81 provided on the element portion 70 and the second protective film 82 provided on the second surface 22b of the unit base member 22 can be obtained.

  FIG. 12C (b) is an enlarged cross-sectional view of the unit intermediate 35 shown in FIG. 12C (a). As shown in FIG. 12C (b), the first protective film 81 is configured to protrude more laterally than the first surface 60a of the decorative portion 60. Further, the decorating part 60 protrudes laterally from the first surface 22 a of the unit base member 22. In addition, the second protective film 82 is configured to protrude laterally from the second surface 22 b of the unit base material 22. Such a relationship between the unit base material 22 and the first protective film 81, the decorative portion 60, and the second protective film 82 is the same as that of the unit base material 22 in the above-described cutting step using the etching liquid. This is realized by continuing the etching process for a time that the unit base material 22 is penetrated by etching from both the first surface 22a and the second surface 22b. In the etching step, etching proceeds isotropically in both the depth direction and the horizontal direction at a position in the vicinity of the first surface 22a and the second surface 22b of the side surface 22c of the unit base member 22 in general. For this reason, as shown in FIG. 12C (b), 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, the etching proceeds deeper. As a result, in the unit base material 22, the first side surface 22 d that intersects the end portion 22 ae and spreads outward as it goes to the second surface 22 b side, and the first side surface 22 d that intersects the end portion 22 be and spreads outward toward the first surface 22 a side Two side surfaces 22e are obtained.

  Next, with reference to FIGS. 13A to 13C, a process for obtaining the cover glass 20 whose side surfaces are reinforced by providing reinforcing portions (resin or the like) on the side surfaces 22 c of the unit base material 22 of the unit intermediate 35. explain.

  First, as shown in FIG. 13A, an application step of applying an application liquid 27 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. Next, the coating liquid 27 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. 13B, the surface of the coating liquid 27 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. Then, the hardening process which hardens the coating liquid 27 provided on the side surface 22c of the unit base material 22 is implemented. Thereby, the reinforcing part 26 is formed on the side surface 22 c of the unit base material 22. Next, as shown in FIG. 13C, the first protective film 81 on the first surface 22a of the unit base member 22 and the second protective film 82 on the second surface 22b of the unit base member 22 are removed. Thus, the cover glass 20 provided with the reinforcement part 26 and the decoration part 60 which are visually recognized continuously can be obtained.

  According to this modification, the first protective film 81 and the second protective film 82 that function as resists during wet etching for cutting the base material 30 are used to increase the height on the side surface 22c of the unit base material 22. The reinforcing part 26 can be formed with an external dimension accuracy. For this reason, the cover glass 20 which has high impact resistance and designability can be obtained with few man-hours.

  Further, according to the present modification, the reinforcing portion 26 is provided by the first protective film 81 and the second protective film 82 provided on the first surface 30a and the second surface 30b of the base material 30 as a resist during wet etching. Is defined. For this reason, the 1st surface 26a located on the same plane as the 1st surface 22a of the unit base material 22 or the 1st surface 60a of the decorating part 60, and the 2nd surface 22b of the unit base material 22 are located on the same plane. Thus, the reinforcing portion 26 including the second surface 26b can be obtained more reliably. That is, the step between the reinforcing portion 26 and the decorative portion 60 and / or the unit base material 22 can be eliminated more reliably, or the step can be further reduced. For this reason, it can further suppress that the boundary between the reinforcement part 26, the decoration part 60, and / or the unit base material 22 is visually recognized by an observer. Moreover, it can further suppress that the operation | work which manufactures the display apparatus 10 combining the cover glass 20 with the display apparatus 15, and the operation feeling of a touchscreen will be inhibited by the level | step difference.

  Moreover, according to this modification, in the unit intermediate body 35 obtained by an etching process by adjusting appropriately the time of the etching process implemented in the cutting process of the base material 30, and the position of the decorating part 60, The decoration part 60 can protrude from the first surface 22a of the unit base member 22 to the side. In this case, as shown in FIG. 13C, the reinforcing portion 26 and the decorating portion 60 partially overlap when viewed along the normal direction of the first surface 22 a of the unit base material 22. For this reason, the cover glass 20 provided with the reinforcement part 26 and the decoration part 60 visually recognized continuously can be obtained with less man-hours.

(Fifth modification)
In the above-described embodiment, the example in which the reinforcing portion 26 includes the binder resin 28a and the plurality of fillers 28b dispersed in the binder resin 28a and exhibiting a predetermined color has been described. That is, an example in which a predetermined color is given to the reinforcing portion 26 by the filler 28b is shown. However, the method of giving a predetermined color to the reinforcing portion 26 is not particularly limited.

  For example, the resin constituting the reinforcing portion 26 may be configured to exhibit a predetermined color. That is, the resin itself constituting the reinforcing portion 26 may have a predetermined color. An example of such a resin is polyimide. Polyimide itself can exhibit yellow, yellowish brown, brown or reddish brown color. Specific examples of such polyimides include Kapton H type manufactured by Toray DuPont Co., Ltd. synthesized from pyromellitic anhydride (PMDA) and 4,4'-diaminodiphenyl ether (ODA), and 3,3 ' , 4,4'-biphenyltetracarboxylic anhydride (BPDA) and p-phenylenediamine (PDA) synthesized by Ube Industries, Ltd. Upilex-S. In addition, a resol-type phenol resin or a novolac-type phenol resin capable of exhibiting a yellowish brown color or a brown color can be used as the resin constituting the reinforcing portion 26.

Or the reinforcement part 26 is further added to resin which comprises the reinforcement part 26, and may further contain the dye which exhibits a predetermined color. That is, a predetermined color may be imparted to the reinforcing portion 26 by adding a dye to the resin. Examples of the kind of dye added to the resin include a yellow dye, a red dye, a blue dye, a purple dye, a green dye, and a black dye.
Examples of yellow dyes include Solvent Yellow 33, Solvent Yellow 93, Solvent Yellow 56, Solvent Yellow 16, Solvent Yellow 14, Disperse Yellow 54, and the like.
Examples of blue dyes include Solvent Blue 5, Solvent Blue 70, Solvent Blue 35, and Solvent Blue 94.
Examples of purple dyes include Solvent Violet 8.
Examples of green dyes include Solvent Green 3.
Examples of black dyes include Solvent Black 3, Solvent Black 7, Solvent Black 27, Solvent Black 29, and the like.
The black dye may be a dye obtained by mixing a yellow dye, a red dye, a blue dye or a green dye.

(Sixth Modification)
In the above-described embodiment and each modification, the example in which the reinforcing portion 26 is formed on the side surface 22c constituting the outer shape of the unit base material 22 among the side surfaces of the unit base material 22 has been shown. However, the present invention is not limited to this, and when the through hole 23 is formed in the unit base member 22 as shown in FIG. 16, the reinforcing portion 26 may be provided on the wall surface 23 a of the through hole 23. That is, the side surface of the unit base material 22 provided with the reinforcing portion 26 may be the wall surface 23 a of the through hole 23 formed in the unit base material 22. The through hole 23 is provided, for example, for mounting a camera, a speaker, or the like on the display device.

  FIG. 17 is a diagram illustrating an example of a method of forming the reinforcing portion 26 on the wall surface 23a of the through hole 23 illustrated in FIG. Note that FIG. 20 shows a state in which the reinforcing portion 26 is formed not only on the wall surface 23 a of the through hole 23 but also on the side surface 22 c constituting the outer shape of the unit base material 22.

  In the example shown in FIG. 17, the first protective film 81 and the second protective film 82 are provided so as to protrude inward from the wall surface 23 a of the through hole 23 of the unit base material 22. Therefore, by applying the coating liquid 27 in the space surrounded by the wall surface 23a of the through hole 23 of the unit base member 22, the first protective film 81, and the second protective film 82, as shown in FIG. The reinforcing portion 26 can be formed on the wall surface 23a with dimensional accuracy.

  The method for forming the reinforcing portion 26 on the wall surface 23a of the through hole 23 of the unit base material 22 is not particularly limited. For example, the reinforcing portion 26 may be formed on the wall surface 23 a of the through hole 23 without using the first protective film 81 and the second protective film 82 as in the case of the above-described present embodiment.

Further, the method for forming the through hole 23 is not particularly limited. For example, the first protective film 81 and the second protective film 82 are formed in the same manner as in the above-described fourth modification in which the base material 30 is divided by wet etching using the first protective film 81 and the second protective film 82. The through holes 23 may be formed in the base material 30 or the unit base material 22 by wet etching that is used. In this case, the first protective film 81 and the second protective film 82 functioning as resists when forming the through-holes 23 by wet etching then define a space for applying the coating liquid 27 as described above. It may function as follows.
In addition, the through holes 23 may be formed in the base material 30 or the unit base material 22 by machining using a drill or the like, laser processing, or the like. When the through hole 23 is formed by machining or laser processing, micro cracks may occur around the through hole 23. In this case, the microcracks may be removed by wet etching around the through holes 23 after the through holes 23 are formed.

  In addition, although the some modification with respect to 1st Embodiment mentioned above has been demonstrated, naturally, it is also possible to apply combining several modifications suitably.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS. In 2nd Embodiment, the reinforcement part 26 and the decorating part 60 are not provided so that it may be visually recognized mutually continuously. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Moreover, when it is clear that the effect obtained in the first embodiment can be obtained in the present embodiment, the description thereof may be omitted.

The reinforcing portion 26 includes a binder resin 28a and a plurality of fillers 28b dispersed in the binder resin 28a, as in the case of the first embodiment described above. The material constituting the filler 28b and the content of the filler 28b are set so that the universal hardness of the reinforcing portion 26 is in the range of 500 to 750 N / mm ² . For example, the content of the filler 28b in the reinforcing portion 26 is set in the range of 1 to 15% by weight. Thereby, it is possible to prevent the reinforcing portion 26 from being damaged when an external force due to an impact or the like is applied to the reinforcing portion 26.

As long as the universal hardness of the reinforcing portion 26 can be in the range of 500 to 750 N / mm ² , the filler 28 b included in the reinforcing portion 26 is not particularly limited. For example, in the present embodiment, a colorless and transparent filler 28b such as a filler containing silicon oxide may be used. The average value of the particle diameter of the filler 28b containing silicon oxide is, for example, in the range of 0.03 to 0.07 μm.

  Note that the modifications to the first embodiment described above may be applied to the present embodiment alone or in combination.

  EXAMPLES Next, although an Example demonstrates this invention further more concretely, this invention is not limited to description of a following example, unless the summary is exceeded.

Example 1
First, a resin material for constituting the reinforcing portion 26 was prepared, and the pencil hardness was measured. As the resin material, an epoxy resin in which fine particles of carbon black are dispersed was prepared. The particle diameter of the fine particles was in the range of 0.01 to 0.05 μm. A resin layer made of this resin material was formed on an appropriate base material, and a pencil hardness test was performed on the resin layer in accordance with JIS 5600-5-4, thereby evaluating the pencil hardness of the resin material. As a result, the pencil hardness was 8H.

  Moreover, the cover glass 20 provided with the reinforcement part 26 which consists of the said resin material was produced. Specifically, first, a unit base material 22 was prepared in which the compressive stress layer 24a was formed on the first surface 22a and the second surface 22b, but the compressive stress layer 24a was not formed on the side surface 22c. The thickness of the unit base material 22 was 0.70 mm. Next, the reinforcement part 26 which consists of the said resin material was formed on the side surface 22c of this unit base material 22, and the side surface 60c of the decorating part 60. FIG. The covering dimension of the reinforcing portion 26 on the side surface 22c was 50 μm.

Next, in accordance with DIN 50359, a pencil hardness test was performed on the reinforcing portion 26 of the manufactured cover glass 20 to evaluate the universal hardness of the reinforcing portion 26, that is, the universal hardness of the material constituting the reinforcing portion 26. . As a result, the universal hardness of the reinforcing portion 26 was 635 N / mm ² .

  Moreover, the bending strength of the produced cover glass 20 was measured. As a measuring method, a four-point bending test method was adopted. As a measuring device, a combination of a tensile / compression tester (for example, AG-I manufactured by Shimadzu Corporation) and a four-point bending test jig prepared for a four-point bending test was used. The measuring instrument used is shown in FIG. As shown in FIG. 15, the measuring instrument includes a pair of indenters 91 that press the cover glass 20 from one side of the cover glass 20, and a pair of supports 92 that support the cover glass 20 on the other side of the cover glass 20. And. As the indenter 91 and the support 92, rod-shaped ones that extend along the cover glass 20 are used, although they are not depicted in FIG. 15. The lengths of the indenter 91 and the support 92 in the depth direction of the paper in FIG. 15 were about 15 cm. Further, the distance L ′ between the pair of indenters 91 was 10 mm, and the distance L between the pair of supports 92 was 30 mm. Further, the radius R1 of the tip portion of the pair of indenters 91 was 2.0 mm, and the radius R2 of the tip portion of the pair of support tools 92 was 3.0 mm. Further, the width l of the cover glass 20 to be measured was about 14 cm, the dimension of the cover glass 20 in the depth direction of FIG. 15 was about 7 cm, and the thickness of the cover glass 20 was 0.7 mm. In addition, alignment of the cover glass 20, the indenter 91, and the support tool 92 to be measured was visually performed so that the respective centers coincide.

  In the bending strength measurement process, a pair of indenters 91 is lowered at a displacement rate of 7 mm / mm by applying a load F (a load applied to one inner indenter 91 is F / 2) to the pair of indenters 91. It was. And the load F at the time of the cover glass 20 breaking was made into the intensity | strength of the cover glass 20. FIG.

Measurement of bending strength using the above-described method was performed on the cover glass 20 in the following three states.
(State 1) Cover glass before impact or friction is applied (State 2) Cover glass after impact is applied to the side using a hammer (State 3) Cover glass after the side is rubbed with sandpaper When the state 2 was realized, the direction of impact applied to the cover glass 20 by the hammer was the normal direction of the side surface 22c of the unit base member 22. The magnitude of impact by the hammer was 4.4 J, the number of impacts was 5, and the period of impact was 30 seconds.
Moreover, when the state 3 was realized, the sandpaper sweeping direction was a direction orthogonal to the normal direction of the side surface 22c of the unit base member 22, the number of sweeps was three, and the sweep cycle was 30 seconds. As the sandpaper, the one with # 400 is used.

  As a result, the bending strength of the cover glass 20 in the state 1 was 750 MPa, the bending strength of the cover glass 20 in the state 2 was 700 MPa, and the bending strength of the cover glass 20 in the state 3 was 700 MPa.

(Example 2)
As a resin material for constituting the reinforcing portion 26, an epoxy resin in which fine particles made of SiO ₂ were dispersed was prepared. The particle size of the fine particles was in the range of 0.03 to 0.07 μm. Further, in the same manner as in Example 1, the pencil hardness of this resin material was evaluated. As a result, the pencil hardness was 9H.

Moreover, the cover glass 20 provided with the reinforcement part 26 which consists of the said resin material similarly to the case of Example 1 was produced. The covering dimension of the reinforcing portion 26 on the side surface 22c was 50 μm. Moreover, the universal hardness of the reinforcement part 26 of the produced cover glass 20 was measured like the case of Example 1. FIG. As a result, the universal hardness of the reinforcing portion 26 was 715 N / mm ² . Moreover, the bending strength of the produced cover glass 20 was measured. As a result, the bending strength of the cover glass 20 in the state 1 was 750 MPa, the bending strength of the cover glass 20 in the state 2 was 750 MPa, and the bending strength of the cover glass 20 in the state 3 was 750 MPa.

(Example 3)
As a resin material for constituting the reinforcing portion 26, a urethane resin in which fine particles of carbon black are dispersed was prepared. The particle diameter of the fine particles was in the range of 0.01 to 0.05 μm. Further, in the same manner as in Example 1, the pencil hardness of this resin material was evaluated. As a result, the pencil hardness was 6H.

Moreover, the cover glass 20 provided with the reinforcement part 26 which consists of the said resin material similarly to the case of Example 1 was produced. The covering dimension of the reinforcing portion 26 on the side surface 22c was 100 μm. Moreover, the universal hardness of the reinforcement part 26 of the produced cover glass 20 was measured like the case of Example 1. FIG. As a result, the universal hardness of the reinforcing portion 26 was 525 N / mm ² . Moreover, the bending strength of the produced cover glass 20 was measured. As a result, the bending strength of the cover glass 20 in the state 1 was 750 MPa, the bending strength of the cover glass 20 in the state 2 was 750 MPa, and the bending strength of the cover glass 20 in the state 3 was 750 MPa.

(Comparative Example 1)
A cover glass 20 that was the same as in Example 1 was prepared except that the reinforcing portion 26 was not provided. The bending strength of the cover glass 20 was measured in the same manner as in Example 1. As a result, the bending strength of the cover glass 20 in the state 1 was 750 MPa, the bending strength of the cover glass 20 in the state 2 was 200 MPa, and the bending strength of the cover glass 20 in the state 3 was 200 MPa.

(Comparative Example 2)
Except that the reinforcing substrate 26 is not provided and the unit base material 22 in which the compressive stress layer 24a is formed on any of the first surface 22a, the second surface 22b, and the side surface 22c is used. A cover glass 20 identical to that in Example 1 was prepared. The bending strength of the cover glass 20 was measured in the same manner as in Example 1. As a result, the bending strength of the cover glass 20 in the state 1 was 800 MPa, the bending strength of the cover glass 20 in the state 2 was 750 MPa, and the bending strength of the cover glass 20 in the state 3 was 700 MPa.

Table 1 summarizes the measurement results in Examples 1 and 2 and Comparative Examples 1 and 2.

  As can be seen from the comparison between Examples 1 and 2 and Comparative Example 1, by providing the reinforcing portion 26, a bending strength of 500 MPa or more is achieved even after impact or friction is applied by a hammer or sandpaper. I was able to. As can be seen from the comparison between Examples 1 and 2 and Comparative Example 2, in Examples 1 and 2, the compressive stress layer 24a is formed on any of the first surface 22a, the second surface 22b, and the side surface 22c. Bending strength equivalent to that of the unit base material 22 can be realized. It can be seen that the reinforcing portion 26 according to the present invention is very effective in protecting the cover glass 20 after impact or friction is applied.

DESCRIPTION OF SYMBOLS 10 Display apparatus with cover glass 15 Display apparatus 20 Cover glass 22 Unit base material 22a 1st surface 22b 2nd surface 22c Side surface 23 Through-hole 23a Wall surface 24a Compressive stress layer 24b Tensile stress layer 26 Reinforcement part 26a 1st surface 26b 2nd surface 26c Side surface 27 Coating liquid 28a Binder resin 28b Filler 30 Base material 35 Unit intermediate 40 Touch panel sensor part 60 Decorating part 70 Element part 81 First protective film 81c End face 82 Second protective film 82c End face

Claims (17)

A cover glass provided on the viewer side of the display device,
A unit substrate made of glass, including a first surface facing the display device side, a second surface on the opposite side of the first surface, and a side surface extending between the first surface and the second surface;
A decorative portion provided on the first surface of the unit base material and exhibiting a predetermined color;
A reinforcing portion made of a resin material provided on at least the side surface of the unit base material,
The reinforcing part and the decorative part are arranged so that they are continuously visible when viewed from the observer side of the cover glass,
The said reinforcement part is a cover glass comprised so that a predetermined color may be included including resin.   The cover glass according to claim 1, wherein the reinforcing portion is configured to exhibit the same color as that of the decorative portion.   The cover glass according to claim 1, wherein the reinforcing portion further includes a plurality of fillers dispersed in the resin and exhibiting a predetermined color. The cover glass of Claim 3 whose universal hardness of the said reinforcement part exists in the range of 500-750 N / mm < ² >.   The cover glass according to claim 3 or 4, wherein the filler contains carbon black.   The cover glass according to claim 3 or 4, wherein the filler includes titanium oxide.   The cover glass according to claim 3 or 4, wherein the filler includes titanium nitride.   The cover glass as described in any one of Claims 3 thru | or 7 whose content of the said filler in the said reinforcement part exists in the range of 0.1-15 weight%.   The cover glass according to claim 1, wherein the resin of the reinforcing portion is configured to exhibit a predetermined color.   The cover glass according to claim 1, wherein the reinforcing portion further includes a dye added to the resin and exhibiting a predetermined color. A cover glass provided on the viewer side of the display device,
A unit substrate made of glass, including a first surface facing the display device side, a second surface on the opposite side of the first surface, and a side surface extending between the first surface and the second surface;
A reinforcing portion made of a resin material provided on at least the side surface of the unit base material,
The reinforcing portion includes a binder resin and a plurality of fillers dispersed in the binder resin,
The cover glass whose universal hardness of the said reinforcement part exists in the range of 500-750 N / mm < ² >.   The cover glass according to claim 11, wherein the filler includes silicon oxide.   The cover glass of Claim 11 or 12 whose content of the said filler in the said reinforcement part exists in the range of 1 to 15 weight%. 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 1, wherein the tensile stress layer is exposed on the side surface of the unit base material.   The cover glass as described in any one of Claims 1 thru | or 14 with which at least one part of the touch-panel sensor part is provided on the said 1st surface of the said unit base material.   The said reinforcement part contains the surface extended in the side from the edge part of the said 2nd surface of the said unit base material on the same plane as the said 2nd surface of the said unit base material. Cover glass as described in. A display device;
A cover glass disposed on the viewer 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.