Glass article, in-vehicle display device, and method for manufacturing same

Abstract

A glass article according to the present invention has a first main surface, a second main surface, and an end surface connecting the first main surface and the second main surface, the end surface includes a side surface portion and a curved first chamfered portion connecting the side surface portion and the first main surface, the first main surface and the first chamfered portion have an anti-reflection layer, and the first chamfered portion has an angle of greater than 0 DEG and 40 DEG or less with the first main surface in a region where the angle formed by the first chamfered portion and the first main surface is greater than 0 DEG. The average value Ra1 of the arithmetic average roughness of the surface of the glass article is 0.20 [mu] m or less, the average value Ra3 of the arithmetic average roughness of the surface of the glass article in a region where the angle between the first chamfered portion and the first main surface is greater than 80 degrees and in a side surface portion is 0.30 [mu] m or more, and the average value Ra3 of the arithmetic average roughness of the surface of the glass article in a region where the angle between the first chamfered portion and the first main surface is 60-80 degrees. The average value Ra2 of the arithmetic average roughness of the surface of the glass article satisfies formula (1): 0.2 < = (Ra2-Ra1) / (Ra3-Ra1) < = 0.8.

Description

Technical Field

[0001] The present invention relates to a glass article, a display device for vehicle use, and a method for manufacturing the same. Background Art

[0002] Conventionally, a glass article having a glass, an antireflection film disposed on a first main surface of the glass, and a frame-shaped printed portion disposed on a second main surface of the glass plate has been used as a cover glass for a display device such as a display device for vehicle use. In recent years, from the viewpoints of improving impact resistance and design, the cover glass of such a display device for vehicle use is required to have a chamfered shape at an end portion on the side closer to the first main surface. At this time, it is known that if the chamfered portion is a curved surface, a phenomenon in which the end portion looks red (hereinafter expressed as red discoloration or the like) occurs (for example, refer to Patent Document 1).

[0003] Since red is a warning color, users of the display device do not like such red discoloration, and sometimes users of the display device may mistake the red discoloration for, for example, an abnormality or a failure of the display device. Therefore, it is required to avoid red discoloration. For example, in Patent Document 1, the red discoloration at the end portion is avoided by adjusting the configuration of the antireflection layer.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: International Publication No. 2021 / 161879 Summary of the Invention

[0007] However, in the technique described in Patent Document 1, it is necessary to adjust the configuration of the antireflection layer itself, so the design flexibility of the antireflection layer may be reduced, and an alternative is required.

[0008] The present invention has been made in view of the above problems, and an object thereof is to provide a glass article capable of suppressing red discoloration at an end portion by a novel method different from that of Patent Document 1.

[0009] The glass article of the present invention is characterized in that it has a first main surface, a second main surface, and an end surface connecting the first main surface and the second main surface. The end surface includes a side portion and a curved first chamfered portion connecting the side portion and the first main surface. An antireflection layer is provided on the first main surface and the first chamfered portion. In a region where the angle formed by the first chamfered portion and the first main surface is greater than 0° and 40° or less, the average value Ra1 of the arithmetic mean roughness Ra of the surface of the glass article is 0.20 μm or less. In a region where the angle formed by the first chamfered portion and the first main surface is greater than 80° and the average value Ra3 of the arithmetic mean roughness Ra of the surface of the glass article in the side portion is 0.30 μm or more. In a region where the angle formed by the first chamfered portion and the first main surface is 60° to 80°, the average value Ra2 of the arithmetic mean roughness Ra of the surface of the glass article satisfies the following formula (1).

[0010] 0.2 ≤ (Ra2 - Ra1) / (Ra3 - Ra1) ≤ 0.8 ··· (1)

[0011] According to the glass article of the present invention, a glass article with suppressed red discoloration at the end can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram showing an in-vehicle display device.

[0013] Figure 2 It is a schematic diagram showing a cross section of the glass article according to the present embodiment.

[0014] Figure 3 It is a schematic diagram showing a cross section of the glass article according to the present embodiment.

[0015] Figure 4 It is a schematic diagram showing a cross section of the glass article according to the present embodiment.

[0016] Figure 5 It is a schematic diagram showing a manufacturing method of the glass article according to the present embodiment. Figure 5 (A) is a diagram schematically showing the state of forming the first chamfered portion by grinding. Figure 5 (B) is a diagram schematically showing the state of polishing the first chamfered portion.

[0017] Figure 6 It is a chart showing the surface roughness of the end surfaces of the glasses of Examples 1 to 4.

[0018] Figure 7 It is a chart showing the surface roughness of the end surfaces of the glasses of Examples 5 to 7. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Hereinafter, the details of the embodiments of the present invention will be described with reference to the accompanying drawings.

[0020] <Automobile display device>

[0021] Figure 1 It is a schematic view of an automobile display device when the glass article according to the present embodiment is used as a covering material for the automobile display device. As Figure 1 shown, the automobile display device 2 is a display device provided in a vehicle. For example, it is provided on the front side of the steering shaft 1 in the vehicle interior. The automobile display device 2 includes a display panel 3 and a glass article 100. Images such as various meters such as a car navigation screen and a speedometer and a start button are displayed on the display panel 3. The glass article 100 is used as a covering material (display covering material) in front of the display panel 3. However Figure 1 this is an example of the configuration, and the automobile display device using the glass article 100 can have any configuration. In addition, the glass article 100 is not limited to being used as a covering material on the surface of an automobile display device, and can also be used for any purpose such as a covering material for a display device of a smart phone or the like.

[0022] <Glass article>

[0023] Figure 2 It is a schematic view showing a cross section of the glass article 100. As Figure 2 shown, the glass article 100 in the present embodiment has glass 10, a first main surface 11, a second main surface 12, and an end surface 13 connecting the first main surface 11 and the second main surface 12. The end surface 13 includes a side surface portion 14 and a first chamfered portion 15 having a curved surface shape connecting the side surface portion 14 and the first main surface 11. It should be noted that the end surface 13 can form a side surface portion 14 and a first chamfered portion 15 having a shape as Figure 2 shown in all regions of the periphery of the glass article 100, or can be formed only in a part of the periphery. Moreover, an antireflection layer 20 is formed on the surface of the glass 10 of the first main surface 11 and the first chamfered portion 15.

[0024] At this time, in a region where the angle formed by the first chamfered portion 15 and the first main surface 11 is greater than 0° and 40° or less, the average value Ra1 of the arithmetic mean roughness Ra of the surface of the glass article 100 is 0.20 μm or less, and in a region where the angle formed by the first chamfered portion 15 and the first main surface 11 is greater than 80° and the average value Ra3 of the arithmetic mean roughness Ra of the surface of the glass article 100 in the side surface portion 14 is 0.30 μm or more, and in a region where the angle formed by the first chamfered portion 15 and the first main surface 11 is 60° to 80°, the average value Ra2 of the arithmetic mean roughness Ra of the surface of the glass article 100 satisfies the following formula (1).

[0025] 0.2 ≤ (Ra2 - Ra1) / (Ra3 - Ra1) ≤ 0.8 ··· (1)

[0026] The first chamfered portion 15 is formed by chamfering the end face 13 of the glass 10, and the side face portion 14 is the non-chamfered area in the end face 13. When the glass article 100 is assembled as a cover glass to the in-vehicle display device 2, since the first chamfered portion 15 is also visually recognized by the driver, sometimes the surface roughness is reduced by polishing the first chamfered portion 15 of the glass 10 for the purpose of improving the appearance. It should be noted that the surface shape of the glass article 100 provided with the anti-reflection layer 20 and other decorative layers on the surface of the glass 10 follows the surface shape of the glass 10, and the arithmetic mean roughness of the surfaces of the glass article 100 and the glass 10 is substantially the same.

[0027] At this time, in the existing chamfering method described in the following (grinding process), generally the entire end face 13 including the side face portion 14 is ground to reduce the surface roughness. However, when the first chamfered portion 15 is formed into a curved surface shape to reduce the surface roughness of the end face 13, there is a problem that end redness inevitably occurs.

[0028] As a result of research by the present inventors, it has been found that by making the average value Ra1 of the arithmetic mean roughness Ra of the surface of the glass article 100 0.20 μm or less in a region where the angle formed with the first main surface 11 that is most easily visually recognized by the driver is greater than 0° and 40° or less, the appearance when observed by the driver can be improved, and by making the average value Ra3 of the arithmetic mean roughness Ra of the surface of the glass article 100 0.30 μm or more in a region where the angle formed with the first main surface 11 of the first chamfered portion 15 is greater than 80° and in the side face portion 14, end redness of the end face 13 can be suppressed without impairing the appearance.

[0029] The mechanism for suppressing end redness will be described below. It should be noted that the mechanism for suppressing end redness is not limited to the following mechanism, and may also be established by principles other than the following.

[0030] When the surface roughness of the glass article 100 in the end face 13 is small, scattering of the surface roughness is not likely to occur, so the driver particularly strongly observes the specularly reflected light in the light incident on the end face 13. Here, it is preferable that the hue of the reflected light of the first main surface is white. At this time, if the composition of the anti-reflection layer is adjusted so that the hue of the reflected light of the first main surface becomes white, the hue of the specularly reflected light of the end face 13 becomes red and is strongly recognized as red, resulting in end redness.

[0031] On the other hand, if the surface roughness of the glass article 100 is increased in the end face 13, the light incident on the end face 13 is scattered. Therefore, the driver observes the light that is scattered and accumulated from the light incident on the end face 13 from various angles. In this case, the hue of the reflected light is close to white.

[0032] Therefore, by increasing the surface roughness in the region where the angle formed by the first chamfered portion 15 and the first main surface 11 is greater than 80° and the side surface portion 14, which is not easily visually recognized by the driver, the scattered light is increased, and the hue of the end portion is made close to white.

[0033] However, when the surface roughness of the end face 13 changes abruptly, the boundary portion is visually recognized as a line. Therefore, in the region where the angle formed by the first chamfered portion 15 and the first main surface 11 is 60° to 80°, the surface roughness is intermediate between the surface roughness of the region where the formed angle is 40° or less and the region where the formed angle is greater than 80°.

[0034] Here, Figure 3 A method for obtaining the angle formed by the first chamfered portion 15 and the first main surface 11 will be described. It should be noted that Figure 3 the antireflection layer is omitted from the display. For example, the angle formed at an arbitrary point P4 is obtained by the following method.

[0035] The cross-sectional view of the glass article 100 is observed using a digital microscope (for example, VHK-6000 manufactured by KEYENS Corporation), that is, the cross-section of the glass article 100 is observed from a direction perpendicular to the thickness direction.

[0036] At this time, an arbitrary point on the side surface portion 14 and the first chamfered portion 15 is set as P1, the intersection of an arc with a radius of 3 mm centered at point P1 and the first main surface 11 is set as position P2, the intersection of an arc with a radius of 5 mm centered at point P1 and the first main surface 11 is set as position P3, and the straight line connecting position P2 and position P3 is set as the reference line LA.

[0037] The angle formed at an arbitrary point P4 is defined as the angle α formed by the tangent line LB on the first chamfered portion 15 at the arbitrary point P4 and the reference line LA.

[0038] According to this method, not only when the first main surface 11 is planar, but also when the first main surface 11 is curved, the angle formed by the point on the first chamfered portion 15 and the first main surface 11 can be defined.

[0039] Next, the arithmetic mean roughness Ra of the surface of the glass article 100 is obtained, for example, by the following method.

[0040] The definition of the arithmetic mean roughness Ra is based on JIS B 0601:2.

[0041] The end face 13 of the glass article 100 is measured using a laser microscope (for example, LEXT OLS5000 manufactured by Olympus Corporation, with a 50x lens). At this time, the glass article 100 is set such that the perpendicular line to the measurement point of the end face 13 coincides with the optical axis of the lens of the laser microscope.

[0042] A region of 256 μm in length and 256 μm in width is measured. At the longitudinal center of the measurement region, in a region of 50 μm in length and 256 μm in width, the arithmetic mean roughness Ra of 10 lines is calculated at 5-μm intervals over the entire transverse length, and the average value thereof is used as the roughness of the measurement point.

[0043] The average value of the arithmetic mean roughness Ra of each region is obtained by calculating the arithmetic mean roughness Ra at multiple measurement points within each region by the above method and using the average value thereof. For example, in a region where the angle formed by the first chamfered portion 15 and the first main surface 11 is greater than 0° and 40° or less, measurements are made at 10°, 20°, 30°, and 40°, and the average value of the arithmetic mean roughness Ra of each measurement point is calculated. One point is measured at every 10° of the angle formed within the region, and the average of each measurement point is used.

[0044] It should be noted that when the glass article 100 according to the present embodiment is used as a covering material for the in-vehicle display device 2, it is preferable that at least a part of the first chamfered portion 15 remains exposed in a state where the glass article 100 is installed as a covering material for the in-vehicle display device 2.

[0045] At this time, in the glass article 100, any 10 points that are almost evenly dispersed in the region of the exposed first chamfered portion 15 are measured. Preferably, 5 or more of these 10 points satisfy the requirements for the arithmetic mean roughness Ra in the present invention. By making 5 or more of the 10 points satisfy the requirements of the present invention, it is possible to intentionally reduce the red shift at the end of the display device felt by the user.

[0046] The preferred embodiment of the glass article 100 will be described in detail below.

[0047] (End face 13)

[0048] In a region where the angle formed by the first chamfered portion 15 and the first main surface 11 is greater than 0° and 40° or less, the average value Ra1 of the arithmetic mean roughness Ra of the surface of the glass article 100 is 0.20 μm or less, more preferably 0.15 μm or less, and further preferably 0.10 μm or less. If it is within the above range, the aesthetics of the end face 13 during driver observation can be improved.

[0049] Here, in the region where the angle formed by the first chamfered portion 15 and the first main surface 11 is 60° to 80°, the average value Ra2 of the arithmetic mean roughness Ra of the surface of the glass article 100 is greater than 0° and 40° or less with respect to the average value Ra1 of the arithmetic mean roughness Ra of the surface of the glass article 100 in the region where the angle formed by the first chamfered portion 15 and the first main surface 11 is less than or equal to 40°, and the average value Ra3 of the arithmetic mean roughness Ra of the surface of the glass article 100 in the region where the angle formed by the first chamfered portion 15 and the first main surface 11 is greater than 80° and the side surface portion 14 satisfies the following formula (1).

[0050] 0.2 ≤ (Ra2 - Ra1) / (Ra3 - Ra1) ≤ 0.8 ···(1)

[0051] Thereby, the region where the formed angle is 60° to 80° can be made into a transition region with an intermediate surface roughness with respect to the region where the formed angle is 40° or less and the region where the formed angle is 80° or more. Therefore, the boundary region cannot be visually recognized as a line shape, and the appearance can be improved.

[0052] Preferably, in the region where the angle formed by the first chamfered portion 15 and the first main surface 11 is 60° to 80°, the average value Ra2 of the arithmetic mean roughness Ra of the surface of the glass article 100 is greater than 0.10 μm and less than 0.35 μm.

[0053] More preferably, in the region where the angle formed by the first chamfered portion 15 and the first main surface 11 is 60° to 80°, the average value Ra2 of the arithmetic mean roughness Ra of the surface of the glass article 100 is greater than 0.10 μm and less than 0.30 μm.

[0054] It should be noted that preferably, in the region where the angle formed by the first chamfered portion 15 and the first main surface 11 is greater than 40° and 80° or less, the average value of the arithmetic mean roughness Ra of the surface of the glass article 100 is greater than 0.10 μm and less than 0.35 μm.

[0055] In addition, the arithmetic mean roughness Ra of the surface of the glass article 100 at the point where the angle formed by the first chamfered portion 15 and the first main surface 11 is 40° 40° , the arithmetic mean roughness Ra of the surface of the above glass article at the point where the angle formed by the first chamfered portion and the above first main surface is 60° 60° , and the arithmetic mean roughness Ra of the surface of the glass article 100 at the point where the angle formed by the first chamfered portion 15 and the first main surface 11 is 80° 80° preferably have the relationship of Ra 40° < Ra 60° < Ra 80°。If it is within the above range, from the region where the formed angle is less than 40° to the region where the formed angle is greater than 80°, the surface roughness gradually increases. Therefore, the boundary region will not be visually recognized as linear, and the aesthetics can be further improved.

[0056] More specifically, the arithmetic mean roughness Ra of the surface of the glass article 100 at the point where the formed angle is 80° 80° is preferably 0.25 μm or more. By making Ra 80° within the above range, scattered light is likely to enter the driver's eyes, and red shift is easily suppressed.

[0057] In the region where the angle formed by the first chamfered portion 15 and the first main surface 11 is greater than 80° and the side surface portion 14, the average value Ra3 of the arithmetic mean roughness Ra of the surface of the glass article 100 is 0.30 μm or more, preferably 0.35 μm or more. If it is within the above range, the red shift at the end portion can be intentionally suppressed by using the above effects.

[0058] The width of the first chamfered portion 15 is preferably 0.5 mm to 5.0 mm. The width of the first chamfered portion 15 is more preferably 1.0 mm or more, further preferably 1.3 mm or more, and particularly preferably 1.5 mm or more. If it is within the above range, the curved surface shape of the end portion is easily visually recognized in the cover glass of the in-vehicle display device, and the design is excellent.

[0059] It should be noted that the width of the first chamfered portion 15 is the distance in the direction along the main surface in the cross-sectional view, and for example, the width A Figure 4 can be adopted.

[0060] The width of the region where the angle formed by the first chamfered portion 15 and the first main surface 11 is greater than 0° and less than or equal to 40° is preferably 0.43 mm to 4.8 mm. The above width is more preferably 0.5 mm or more, further preferably 0.75 mm or more, and the upper limit is more preferably 4.0 mm or less, further preferably 3.0 mm or less. If it is within the above range, the chamfer shape of the first chamfered portion 15 is easily visually recognized, and the aesthetics is excellent.

[0061] The first chamfered portion 15 has a curved surface shape. The curved surface may have a single radius of curvature, or may be a shape of a curved surface combining multiple radii of curvature. At this time, the radius of curvature of the point where the angle formed by the first chamfered portion 15 and the first main surface is 45° is preferably 0.05 mm or more, more preferably 0.1 mm or more. If it is within the above range, the side surface portion 14 and the first chamfered portion 15 are smoothly connected, which helps to improve the appearance and prevent notches. On the other hand, the average radius of curvature of the first chamfered portion 15 is preferably 10 mm or less, more preferably 6 mm or less, and further preferably 4 mm or less. If it is within the above range, the first chamfered portion 15 is easily visually recognized as a curved surface, and the appearance is excellent. On the other hand, within the above range, the thickness change of the antireflection layer easily occurs, and red shift easily occurs. The anti-red shift of the present invention is effective.

[0062] As Figure 4 shown, the end surface 13 may further include a second chamfered portion 16 on the second main surface 12 side. It should be noted that the antireflection layer is omitted from the display in Figure 4 . The second chamfered portion 16 connects the second main surface 12 and the side surface portion 14. In Figure 4 , the second chamfered portion 16 is a flat surface, but like the first chamfered portion 15, it may also be a curved surface.

[0063] At this time, the end surface 13 can be designed such that the parameter R represented by the following formula (2) falls within the range satisfying formula (3). By making the parameter R within the specified range, the impact resistance of the end surface 13 can be improved and cracks can be suppressed, so it is preferable.

[0064] R = 0.38·E cg -A / t-2.61·B / t + 4.38·C / t-10.6·D / t···(2)

[0065] R ≤ 23.58···(3)

[0066] Here, E in formula (2) cg refers to the Young's modulus (GPa) of the glass article 100, A is the width (mm) of the first chamfered portion 15, which is the distance from the boundary position F1 to the boundary position F2 along the direction of the reference line LC. In addition, B in formula (2) is the width (mm) of the second chamfered portion 16, which is the distance from the boundary position F3 to the boundary position F4 along the direction of the reference line LC. In addition, C in formula (2) is the thickness (mm) of the side surface portion 14, which is the distance from the boundary position F2 to the boundary position F3. In addition, D in formula (2) is the thickness (mm) of the first chamfered portion 15, which is the distance from the boundary position F1 to the boundary position F2 in the tangential direction at the outermost position of the end surface 13. In addition, t in formula (2) is the thickness (mm) of the glass article 100. In addition, the "·" in formula (2) represents multiplication and is also represented as "×".

[0067] By making the parameter R of the glass article 100 satisfy the above formula (3), the impact resistance at the end portion can be improved. Here, the larger the width A of the first chamfered portion 15 or the width B of the second chamfered portion 16, the lower the value of the parameter R. That is, by increasing the width A of the first chamfered portion 15, the contact portion of the impactor moves away from the end face 13, and by absorbing the impact of the impactor with the first main surface 11, the impact resistance of the end face 13 can be improved. In addition, by increasing the widths of the first chamfered portion 15 and the second chamfered portion 16, the thickness of the end face 13 becomes thinner relative to the thickness t of the glass article 100, so that the bending stress generated at the end face 13 decreases, and the impact resistance of the end face 13 can be improved. In addition, the larger the thickness D of the first chamfered portion 15, the lower the value of the parameter R. That is, by making the thickness of the end face 13 thinner relative to the thickness t of the glass article 100, the bending stress generated at the end face 13 decreases, and the impact resistance of the end face 13 can be improved. In addition, the lower the thickness C of the side face portion 14, the higher the value of the parameter R. That is, by making the thickness of the side face portion 14 smaller, the area of the first chamfered portion 15 is expanded, the thickness of the end face 13 becomes thinner relative to the thickness t of the glass article 100, so that the bending stress generated at the end face 13 decreases, and the impact resistance of the end face 13 can be improved.

[0068] Here, the positions of the first chamfered portion 15, the second chamfered portion 16, and the side face portion 14 can be specified by the boundary positions F1, F2, F3, and F4. Specifically, in the end face 13 of the glass article 100, the region from the boundary position F1 to the boundary position F2 is the first chamfered portion 15, the region from the boundary position F2 to the boundary position F3 is the side face portion 14, and the region from the boundary position F3 to the boundary position F4 is the second chamfered portion 16.

[0069] The boundary positions F1 to F4 can be defined as follows.

[0070] When observing the cross-sectional view of the glass article 100 with a digital microscope (for example, VHK-6000 manufactured by KEYENS), that is, when observing the cross-section of the glass article 100 from a direction perpendicular to the thickness direction, when the first main surface 11 is a plane, the straight line passing through the above-mentioned positions P2 and P3 is set as the reference line LC. When the first main surface 11 is a curved surface, the circular arc line passing through the positions P2, P3, and an arbitrary intermediate point between the position P2 and the position P3 is set as the reference line LC. When extending the reference line LC to the outside of the glass article 100 beyond the position P2, the point on the first main surface 11 where the distance between the line LC and the extension line is 50 μm and the point closest to the position P2 can be set as the boundary position F1.

[0071] Let the line perpendicular to the line LC passing through the boundary position F1 be the line LC1. Here, the point where the line parallel to the line LC1 and the end face 13 are connected at one point is set as the outermost position of the end face 13 (i.e., the position that protrudes most outward from the glass article 100 in the end face 13). In this case, among the intersections of the line parallel to the line LC1 at the outermost position of the end face 13 and the end face 13 after moving the line 50 μm in the direction perpendicular to this line, the intersection closer to the first main face is set as the boundary position F2. On the other hand, among the intersections of the line parallel to the line LA1 at the outermost position of the end face 13 and the end face 13 after moving the line 50 μm in the direction perpendicular to this line, the intersection closer to the second main face is set as the boundary position F3.

[0072] Let the line obtained by moving the line LC by the thickness t of the glass article 100 in the thickness direction of the glass article 100 be the line LD. The line LD can also be referred to as the line along the second main face 12. When extending the line LD toward the end face 13 side, the point on the second main face 12 where the distance from the line LD to the extension line is 50 μm and which is the innermost point can be set as the boundary position F4.

[0073] From the viewpoint of improving the impact resistance of the end portion, the width A of the first chamfered portion 15 is preferably 2.0 mm or less, more preferably 0.5 mm to 2.0 mm. In addition, the ratio of the width A of the first chamfered portion 15 to the thickness t of the glass article 100, that is, the glass article plate thickness ratio (A / t), is preferably 0.77 or more, more preferably 1.15 or more. By setting the width A within this range, the impact resistance of the end face 13 can be more appropriately improved.

[0074] The width B of the second chamfered portion 16 is preferably greater than 0 mm and 2.0 mm or less, and further preferably 1.0 mm to 2.0 mm. In addition, the ratio of the width B of the second chamfered portion 16 to the thickness t of the glass article 100, that is, the glass article plate thickness ratio (B / t), is preferably 0.77 to 4.0, more preferably 1.15 to 2.86. By setting the width B within this range, the impact resistance of the end face 13 can be more appropriately improved.

[0075] The thickness C of the side face portion 14 is preferably the thickness t of the glass article 100 or less, more preferably greater than 0 mm and 2.0 mm or less, and further preferably 0.25 mm to 2.0 mm. In addition, the ratio of the thickness C of the side face portion 14 to the thickness t of the glass article 100, that is, the glass article plate thickness ratio (C / t), is preferably 0.6 or less, more preferably 0.4 or less. By setting the thickness C within this range, the impact resistance of the end face 13 can be more appropriately improved.

[0076] The thickness D of the first chamfered portion 15 is preferably greater than 0 mm and equal to or less than the thickness t of the glass article 100, more preferably greater than 0 mm and equal to or less than 2.0 mm, and still more preferably 0.1 mm to 2.0 mm. In addition, the ratio of the thickness D of the first chamfered portion 15 to the thickness t of the glass article 100, that is, the glass article plate thickness ratio (D / t), is preferably 0.2 or more, more preferably 0.4 or more, and the upper limit is preferably 0.7 or less. That is, the ratio (D / t) is preferably 0.2 to 0.7. By making the thickness D within this range, the impact resistance of the end face 13 can be more appropriately improved.

[0077] That is, as a preferred embodiment of the chamfered portion, the following method can be cited.

[0078] (i) The width A of the first chamfered portion 15 is 2.0 mm or less, the glass article plate thickness ratio (A / t) is 0.77 or more, the width B of the second chamfered portion 16 is 0.77 to 4.0 in terms of the glass article plate thickness ratio (B / t), the thickness C of the side surface portion 14 is 0.25 mm or more, the glass article plate thickness ratio (C / t) is 0.6 or less, and the thickness D of the first chamfered portion 15 is 0.2 to 0.7 in terms of the glass article plate thickness ratio (D / t).

[0079] (ii) The width A of the first chamfered portion 15 is 2.0 mm or less, the glass article plate thickness ratio (A / t) is 1.15 or more, the width B of the second chamfered portion 16 is 1.15 to 2.86 in terms of the glass article plate thickness ratio (B / t), the thickness C of the side surface portion 14 is 0.25 mm or more, the glass article plate thickness ratio (C / t) is 0.4 or less, and the thickness D of the first chamfered portion 15 is 0.4 to 0.7 in terms of the glass article plate thickness ratio (D / t).

[0080] (iii) The width A of the first chamfered portion 15 is 2.0 mm or less, the glass article plate thickness ratio (A / t) is 0.77 or more, the width B of the second chamfered portion 16 is 1.0 mm to 2.0 mm, the thickness C of the side surface portion 14 is 0.25 mm or more, the glass article plate thickness ratio (C / t) is 0.6 or less, and the thickness D of the first chamfered portion 15 is 0.2 to 0.7 in terms of the glass article plate thickness ratio (D / t).

[0081] (iv) The width A of the first chamfered portion 15 is 2.0 mm or less, the glass article plate thickness ratio (A / t) is 1.15 or more, the width B of the second chamfered portion 16 is 1.0 mm to 2.0 mm, the thickness C of the side surface portion 14 is 0.25 mm or more, the glass article plate thickness ratio (C / t) is 0.4 or less, and the thickness D of the first chamfered portion 15 is 0.4 to 0.7 in terms of the glass article plate thickness ratio (D / t). And the second chamfered portion 16 has a C-chamfered shape.

[0082] (Hue of reflected light)

[0083] From the viewpoint of correctly identifying the color of the image projected onto the display device, the reflected light from the first major surface is preferably white. However, for example, in the method of Patent Document 1, by adjusting the design of the antireflection layer 20 such that the reflected color of the first major surface 11 approaches blue, even if the end portion is relatively red, it can be visually recognized as white, thereby preventing red discoloration. Therefore, it is difficult to suppress red discoloration at the end portion while maintaining the first major surface 11 as white. However, in the glass article according to the present embodiment, it is possible to make the first major surface 11 white and suppress red discoloration at the end portion.

[0084] The hue of the reflected light from the first major surface 11 is preferably -3 < a * a * b * in the CIELAB color system and -3 < b * < 3, and more preferably -2.5 < a * < 2.5 and -2.5 < b * < 2.5. If it is within the above range, the hue of the reflected light is sufficiently recognized as white. Here, the hue of the reflected light from the first major surface 11 can be measured by the SCI mode of a spectrocolorimeter (for example, CM-2600D manufactured by Konica Minolta, Inc.). * On the other hand, for the hue of the reflected light at each measurement point of the first chamfered portion 15 measured by the following measurement method, based on CIELAB

[0085] the average value of a * a * b * for the measurement points satisfying L * ≥ 5 is preferably 0 to 15.0. *

[0086] (Measurement method)

[0087] In the first chamfered portion 15, using the perpendicular line at the point where the angle formed by the first chamfered portion 15 and the first major surface 11 is 45° as a reference, white light is incident from an angle of 10° to the side surface portion 14 side, and a spectroscopic image is obtained at an angle of 10° on the first major surface 11 side using a two-dimensional spectral radiometer (for example, "SR-5000" manufactured by TechnoOptis Co., Ltd.).

[0088] In the obtained image, the measurement points are divided for each pixel, and the hue of each measurement point is calculated in the CIELAB * a * b * color system. It should be noted that CIELAB * a * b * ​The calculation of the colorimetric system is based on JIS Z8781-4.

[0089] The inventors et al. found that at points where L * ≥5, due to the high brightness, red is particularly likely to be strongly recognized. From the perspective of making red less conspicuous, it is effective to preferentially reduce a * at points where L * ≥5. Therefore, according to the experimental results, it is known that if the average value of a * at the measurement points where L * ≥5 is 0 to 15.0, the red color can be intentionally reduced when observed by visual identifiers.

[0090] Furthermore, if the average value of a * at the measurement points where L * ≥5 is more preferably 10.0 or less, further preferably 8.0 or less, and particularly preferably 6.0 or less, it is more effective.

[0091] (Glass)

[0092] As the glass 10, alkali-free glass, soda-lime glass, soda-lime silicate glass, aluminosilicate glass, borosilicate glass, lithium aluminosilicate glass, borosilicate glass, etc. can be used. Aluminosilicate glass or lithium aluminosilicate glass, which is preferably easy to introduce large stresses through strengthening treatment to obtain high-strength glass even when the thickness is thin, is preferred.

[0093] The glass 10 is preferably a chemically strengthened glass, for example, obtained by chemical strengthening treatment.

[0094] As a method for obtaining a chemically strengthened glass by chemically strengthening the glass 10, typically, a method of immersing the glass in a KNO3 molten salt, performing ion exchange treatment, and then cooling to near room temperature can be cited. Processing conditions such as the temperature of the KNO3 molten salt or the immersion time can be set so that the surface compressive stress and the thickness of the compressive stress layer become desired values.

[0095] The surface compressive stress (CS) of the compressive stress layer is preferably 500 MPa or more, more preferably 600 MPa or more, and further preferably 700 MPa or more. On the other hand, CS is preferably 1300 MPa or less. That is, the surface compressive stress (CS) of the compressive stress layer is preferably in the range of 500 MPa to 1300 MPa.

[0096] The thickness (DOL) of the compressive stress layer is preferably 10 μm or more, more preferably 15 μm or more, further preferably 20 μm or more, and particularly preferably 25 μm or more. In addition, DOL is preferably 50 μm or less, more preferably 40 μm or less. That is, the thickness (DOL) of the compressive stress layer is preferably in the range of 10 μm to 50 μm.

[0097] When chemical strengthening is carried out, examples of the glass type include soda-lime glass, aluminosilicate glass (SiO2-Al2O3-Na2O-based glass), etc. Among them, aluminosilicate glass is preferred from the viewpoint of strength.

[0098] As the glass material, for example, in terms of mol% based on oxides, a glass material containing 50% to 80% of SiO2, 1% to 20% of Al2O3, 6% to 20% of Na2O, 0% to 11% of K2O, 0% to 15% of MgO, 0% to 6% of CaO, and 0% to 5% of ZrO2 can be cited.

[0099] It is also preferable to use a chemically strengthened glass based on aluminosilicate glass. For example, "Dragontrail (registered trademark)" manufactured by AGC Inc. can be cited.

[0100] More specifically, the following compositions can be cited as more preferable compositions of the glass. It should be noted that, for example, "containing 0 to 25% of MgO" means that MgO is not essential, but it can contain up to 25% of MgO. The glass in (i) below is included in soda-lime silicate glass, the glasses in (ii) and (iii) below are included in aluminosilicate glass, and the glasses in (iv) to (vi) below are included in lithium aluminosilicate glass.

[0101] (i) A glass containing 63 to 73% of SiO2, 0.1 to 5.2% of Al2O3, 10 to 16% of Na2O, 0 to 1.5% of K2O, 0 to 5.0% of Li2O, 5 to 18% of MgO, and 1 to 10% of CaO in the composition expressed in mol% based on oxides.

[0102] (ii) A glass in which the composition expressed in mol% based on oxides contains 50 to 74% of SiO2, 5 to 15% of Al2O3, 10 to 20% of Na2O, 0 to 8% of K2O, 0 to 5.0% of Li2O, 2 to 15% of MgO, 0 to 6% of CaO, and 0 to 5% of ZrO2, and the total content of SiO2 and Al2O3 is 65 to 85%, the total content of Na2O and K2O is 12 to 25%, and the total content of MgO and CaO is 1 to 15%.

[0103] (iii) A glass containing 68 to 80% of SiO2, 4 to 10% of Al2O3, 5 to 15% of Na2O, 0 to 1% of K2O, 0 to 5.0% of Li2O, 4 to 15% of MgO, and 0 to 1% of ZrO2 in the composition expressed in mol% based on oxides.

[0104] (iv) The composition expressed in mol% based on oxides contains 67 - 75% of SiO2, 0 - 4% of Al2O3, 7 - 15% of Na2O, 1 - 9% of K2O, 0 - 5.0% of Li2O, 6 - 14% of MgO, and 0 - 1.5% of ZrO2, and the total content of SiO2 and Al2O3 is 71 - 75%, the total content of Na2O and K2O is 12 - 20%, and when CaO is contained, its content is less than 1% of the glass.

[0105] (v) The composition expressed in mol% based on oxides contains 50 - 73% of SiO2, 5 - 20% of Al2O3, 0 - 6% of B2O3, 0 - 10% of P2O5, 4 - 12% of Li2O, 3 - 20% of Na2O, 0 - 5% of K2O, 0 - 8% of MgO, 0 - 2% of CaO, 0 - 5% of SrO, 0 - 5% of BaO, 0 - 5% of ZnO, 0 - 2% of TiO2, 0 - 4% of ZrO2 of the glass.

[0106] (vi) The composition expressed in mol% based on oxides contains 58 - 80% of SiO2, 13 - 18% of Al2O3, 0 - 5% of B2O3, 0.5 - 4% of P2O5, 3 - 10% of Li2O, 5 - 20% of Na2O, 0 - 2% of K2O, 0 - 11% of MgO, 0 - 20% of CaO, 0 - 20% of SrO, 0 - 15% of BaO, 0 - 10% of ZnO, 0 - 1% of TiO2, 0 - 2% of ZrO2 of the glass.

[0107] The thickness of the glass is not particularly limited. For effective chemical strengthening treatment, it is preferably 5 mm or less, more preferably 3 mm or less. In addition, when used as a cover glass for in-vehicle display devices such as car navigation, from the viewpoint of strength, the thickness of the glass is preferably 0.2 mm or more, more preferably 0.8 mm or more, and further preferably 1 mm or more. It should be noted that the thickness of the glass refers to the distance between the first main surface 10A and the second main surface 10B of the glass 10 in the normal direction. That is, the thickness of the glass is preferably in the range of 0.2 mm to 5 mm.

[0108] The size of the glass 10 can be appropriately selected according to the use. When used as a covering material for in-vehicle display devices, the length of the short side is, for example, 50 mm to 500 mm, preferably 100 mm to 300 mm, and the length of the long side is, for example, 50 mm to 1500 mm, preferably 100 mm to 1200 mm.

[0109] The shape of the glass 10 can be a flat shape or a shape including a three-dimensional curved surface having one or more bending parts or bending portions.

[0110] Here, the curved surface in this embodiment means that the radius of curvature is 10,000 mm or less. Conversely, the flat surface means that the radius of curvature is greater than 10,000 mm.

[0111] When the glass 10 has a curved surface, the radius of curvature of the curved surface is preferably 50 mm or more, more preferably 100 mm or more, and further preferably 200 mm or more. The radius of curvature is, for example, 10,000 mm or less, preferably 5,000 mm or less, and more preferably 3,000 mm or less.

[0112] The Young's modulus (E cg ) of the glass 10 is preferably 60 GPa or more, more preferably 70 GPa or more. In addition, the Young's modulus (E cg ) of the glass article 100 is preferably 90 GPa or less, more preferably 80 GPa or less, and further preferably 75 GPa or less. That is, the Young's modulus of the glass 10 is preferably 60 GPa to 90 GPa, more preferably 70 GPa to 80 GPa, and further preferably 70 GPa to 75 GPa. The Young's modulus of the glass 10 can be obtained by a tensile test (JIS K7161·JIS K7113).

[0113] (Anti-reflection layer)

[0114] An anti-reflection layer 20 is formed on the first main surface 11 side of the glass article 100. Figure 2 In, the anti-reflection layer 20 is formed on the surface of the glass 10.

[0115] The anti-reflection layer refers to a layer that brings the effect of reducing the light reflectance. In addition to reducing the glare caused by the incident light, when used in an image display device, it can also improve the light transmittance of the light from the image display device and improve the visibility of the image display device.

[0116] The anti-reflection layer 20 is made of, for example, a metal oxide. As the structure of the anti-reflection layer 20, as long as it can suppress the reflection of light, for example, it can be a structure formed by alternately laminating a high-refractive-index layer with a refractive index of 1.9 or more at a wavelength of 550 nm and a low-refractive-index layer with a refractive index of 1.6 or less at a wavelength of 550 nm. The number of layers of the low-refractive-index layer and the high-refractive-index layer is not particularly limited. For example, it is 1 to 30 layers, the low-refractive-index layer is preferably 1 to 6 layers, and the high-refractive-index layer is preferably composed of the same number of layers as the low-refractive-index layer.

[0117] When the low refractive index layer and the high refractive index layer each consist of multiple layers, for example, six layers, as the antireflection layer 20, when the layer farthest from the glass 10 is taken as the outermost layer and the layers are numbered from the outermost layer as the first layer toward the glass substrate side, the odd-numbered layers including the outermost layer, that is, the outermost layer, the third layer, and the fifth layer, are composed of the low refractive index layer. If the layer closer to the glass substrate side than the outermost layer is taken as the second layer, the even-numbered layers including the second layer, that is, the second layer, the fourth layer, and the sixth layer, are composed of the high refractive index layer. The high refractive index layer farthest from the outermost layer, that is, the sixth layer, is in contact with the glass 10.

[0118] When the low refractive index layer and the high refractive index layer each consist of one layer, the low refractive index layer is the outermost layer and the high refractive index layer is the second layer.

[0119] The low refractive index layer is made of a silicon-containing material, for example. It can be silicon oxide, aluminum-doped silicon oxide obtained by doping aluminum in silicon oxide, or a material obtained by adding tin or zirconia to silicon oxide.

[0120] The main component of the high refractive index layer forming the second layer is preferably one or more selected from silicon nitride, titanium oxide, niobium oxide, tantalum oxide, and zirconia. Among these materials, from the viewpoints of productivity and refractive index, silicon nitride, niobium oxide, and tantalum oxide are more preferred, and niobium oxide is most preferred.

[0121] For the even-numbered layers after the fourth layer, for example, the fourth layer and the sixth layer, the main component can be the same as that of the second layer or can be a material different from that of the second layer. When the main component of the second layer is niobium oxide, the even-numbered layers after the fourth layer can be niobium oxide the same as the second layer or can be a material different from that of the second layer.

[0122] It should be noted that the total number of the high refractive index layer and the low refractive index layer of the antireflection layer 20 can be different. When they are different, for example, the outermost layer and the layer in contact with the glass are preferably the low refractive index layer, and the main component of the low refractive index layer in contact with the glass is preferably silicon oxide.

[0123] The total thickness of the antireflection layer 20 is, for example, 100 nm to 1000 nm, preferably 150 nm to 550 nm, more preferably 190 nm to 510 nm, and most preferably 195 nm to 506 nm.

[0124] The thickness of the outermost layer is, for example, 60 nm to 130 nm, preferably 70 nm to 100 nm, more preferably 75 nm to 90 nm, and further preferably 77 nm to 88 nm.

[0125] The thickness of the second layer is, for example, 15 nm to 200 nm, preferably 20 nm to 150 nm, and more preferably 25 nm to 115 nm.

[0126] It should be noted that the thickness of the antireflection layer 20 is measured on the first main surface 11. For the measurement of the thickness, examples include the measurement of the actual thickness by cross-sectional observation using SEM (Scanning Electron Microscopy) or TEM (Transmission Electron Microscopy), or optical measurement using the polarization light analysis method. When antiglare treatment is performed, it is preferable to use SEM or TEM to measure the actual thickness. In addition, when the refractive indices of each layer are known, the thickness can be derived from the spectral reflectance or transmittance (Reference: "Optical Thin Films and Film Deposition Technology", author Li Zhengzhong, translator Arbakku, publisher AGNE Gijutsu Center, publication year 2002). Especially when the refractive indices of each layer are known, it is preferable to measure the thickness from the spectral reflectance.

[0127] (Other decorative layers)

[0128] In addition, although not shown, decorative layers such as an antiglare layer and an antifouling layer can be provided on the first main surface 11 side of the glass article 100. The following antiglare layer and antifouling layer are examples and can be appropriately changed within the range of having the functions of each layer. In addition, the antiglare layer and the antifouling layer are not essential components and can be provided partially according to the configuration of the glass article 100.

[0129] The antiglare layer is provided on the first main surface 11 side and imparts antiglare properties to the glass 10. The antiglare layer is constituted by, for example, an uneven shape formed on the first main surface 11 side. The uneven shape can be one directly formed on the surface of the glass 10, or can be formed by another layer different from the glass 10. In addition, it can be provided on both the first main surface 11 and the second main surface 12 sides. The root mean square roughness (RMS) of the uneven shape is preferably 10 nm to 1000 nm, more preferably 15 nm to 500 nm. The antiglare layer can be realized by the uneven shape imparted by performing antiglare treatment and etching treatment on the surface of the glass 10. In addition, a coating film in which particles having an arbitrary refractive index are dispersed can be used on the surface of the glass 10, or an uneven shape can be formed on the main surface of the adhered transparent resin film, and the antiglare layer can be realized by this uneven shape.

[0130] The anti-fouling layer is an anti-fouling layer that has the function of suppressing the adhesion of fingerprint marks or various dirt such as sweat and dust, making the dirt less conspicuous, or facilitating the cleaning of the adhered dirt, and keeps the display surface clean. The anti-fouling layer is provided on the side of the first main surface 11, but from the viewpoint of the characteristics of the anti-fouling layer, it is preferably formed on the outermost surface on the side of the first main surface 11 of the glass article 100. For example, the anti-fouling layer is provided on the anti-reflection layer. The anti-fouling layer is composed of a fluorine-containing compound (a compound having a fluorine-containing organic group) that can impart anti-fouling properties, hydrophobicity, and oleophobicity. The fluorine-containing compound is preferably a fluorine-containing organic compound, and more preferably a fluorine-containing organosilicon compound.

[0131] (Printing layer)

[0132] Although not shown, a printing layer may be provided on the second main surface side of the glass article 100. The printing layer is provided, for example, on the outer peripheral portion of the glass article 100, has a shape with an opening portion, and functions to shield wiring components and the like disposed in the peripheral portion of the display panel 3 so that the driver cannot visually recognize them. The opening portion is used as a display area when the display panel 3 is lit. The opening portion may be one or two or more. The printing layer is not particularly limited as long as it can block visible light, and is, for example, black or a wood grain pattern.

[0133] The glass article 100 provided with the printing layer on the second main surface side can be used as a display cover glass.

[0134] <Manufacturing method of glass article>

[0135] Next, the manufacturing method of the glass article in the present embodiment will be described.

[0136] (Preparation of glass)

[0137] Prepare glass 10 having a first main surface 11 and a second main surface 12. The manufacturing method of the glass 10 is not particularly limited. For example, the required glass raw materials can be put into a melting furnace, heated and melted at 1500 to 1600 °C and clarified, and then supplied to a forming device to form the molten glass into a flat plate shape and slowly cooled for manufacturing. It should be noted that the forming method of the glass is not particularly limited. For example, the down-draw method (such as the overflow down-draw method, the slot down-draw method, the re-draw method, etc.), the float method, the roll pressing method, the pressing method, etc. can be used.

[0138] In addition, it may have a forming process of cutting the glass on the obtained flat plate into an arbitrary shape and size and bending it into a three-dimensional shape while heating. A curved surface is formed on the glass 10 through the forming process.

[0139] (Chamfering portion forming process)

[0140] First, the end face 13 of the obtained glass is ground to form the curved surface shape of the first chamfering portion 15. Figure 5(A) schematically shows the state where the first chamfered portion 15 is formed by grinding. It should be noted that, in Figure 5 (A), the texture of the glass 10 is omitted for the sake of illustration. As Figure 5 (A) shows, by pressing the end face 13 of the glass 10 against the rotating grindstone 40, the end face 13 is ground to form the side face portion 14, the first chamfered portion 15, and the second chamfered portion 16 indicated by the dotted lines. For the grinding process, an electroplated grinding wheel (for example, with a mesh number of #325 or more) etc. is used. The grinding process can be carried out over the entire circumference of the glass 10 or in a partial section of the circumference. The surface roughness of the end face 13 chamfered by the above method can be, for example, 0.2 μm to 1.0 μm in terms of the arithmetic mean roughness Ra. It should be noted that the method for forming the chamfered portion is not limited to the above method, and it can also be formed by laser cutting etc.

[0141] (Grinding process)

[0142] Next, the surface roughness is reduced by grinding the first chamfered portion 15.

[0143] Here, the conventional grinding method is described. Conventionally, for grinding the chamfered portion, a non-woven brush or a felt-like pad (for example, International Publication No. 2015 / 108076 and International Publication No. 2013 / 031548) is used. According to the conventional method, since the grinding covers the entire end face 13 including the first chamfered portion 15 and a partial area of the first main face 11 and the second main face 12, the surface roughness of the entire end face 13 is reduced.

[0144] On the other hand, in the manufacturing method of the present embodiment, as shown in Figure 5 (B), the rotating grindstone 50 is used to grind the first chamfered portion 15. The rotating grindstone 50 uses, for example, a grindstone containing cerium oxide. In Figure 5 (B), the rotating grindstone 50 is provided with grooves, and the lower part of the grooves has a shape along the curved surface of the first chamfered portion 15. By pressing the first chamfered portion 15 against this part, the surface of the first chamfered portion 15 is ground.

[0145] At this time, it is preferable to adjust the positions of the glass 10 and the rotating grindstone 50 so that the region of the first chamfered portion 15 that forms an angle greater than 0° and 40° or less with the first main face 11 is mainly ground. On the other hand, it is preferable that the region of the first chamfered portion 15 that forms an angle greater than 80° with the first main face 11 and the side face portion 14 do not strongly contact the rotating grindstone 50. In addition, it is preferable to appropriately adjust the pressing position or the pressing pressure etc. for grinding so that the roughness gradually increases from the region where the formed angle is 40° or less to the region where the formed angle is greater than 80°.

[0146] By the above steps, each region is polished so as to have the surface roughness described in the above <Glass article>.

[0147] (Chemical strengthening process)

[0148] When the glass article 100 is used as the cover glass of a display device, it is preferable to chemically strengthen the obtained glass 10. The chemical strengthening treatment method is not particularly limited, and examples thereof include a method of forming a surface layer with residual compressive stress by ion exchange on the main surface of a transparent substrate. Specifically, at a temperature below the glass transition temperature, an alkali metal ion with a small ionic radius (e.g., Li ion, Na ion) contained in the glass near the main surface of the substrate is replaced with an alkali metal ion with a larger ionic radius (e.g., Na ion or K ion relative to the Li ion, and K ion relative to the Na ion). Thereby, compressive stress remains on the main surface of the transparent substrate 10, and the strength of the transparent substrate is improved.

[0149] (Printing layer forming process)

[0150] When the glass article 100 is used as the cover glass of a display device, it is preferable to form a printing layer on the second main surface 12 side of the obtained glass 10. The printing layer is formed, for example, by printing ink, and is preferably printed in a design with an opening portion at the outer peripheral portion of the second main surface 12. The printing method is not particularly limited, and as a preferable method, an inkjet method, a screen printing method, a transfer decoration method, etc. can be cited.

[0151] (Anti-reflection layer forming process)

[0152] An anti-reflection layer 20 is formed on the first main surface 11 side of the obtained glass 10. The anti-reflection layer is preferably a laminated structure of the metal oxide layers described above (Anti-reflection layer). The film formation method of the metal oxide layer is not particularly limited, and various film formation methods can be used. For example, physical vapor deposition methods such as vacuum evaporation, ion beam assisted evaporation, ion plating, sputtering, and plasma CVD can be used. Among these film formation methods, the sputtering method is preferable because a dense and highly durable film can be formed. It is particularly preferable to form a film by a sputtering method such as pulsed sputtering, AC sputtering, or digital sputtering.

[0153] When forming a film on the metal oxide layer by the sputtering method, the glass 10 is placed in a chamber with a mixed gas atmosphere of an inert gas and oxygen, and a target that selects a raw material to become the required composition for each layer is used for film formation. The adjustment of the layer thickness of each layer can be performed, for example, by adjusting the discharge power, the film formation time, etc.

[0154] (Other decorative layer forming process)

[0155] In addition, a decorative layer such as an antiglare layer or an antifouling layer can be formed on the first main surface 11 side of the glass 10 or on both the first main surface 11 and the second main surface 12 sides. The antiglare layer, antireflection layer, and antifouling layer can be appropriately formed by known methods. The formation order of the antiglare layer, antireflection layer, and antifouling layer is not particularly limited. The formation of the antiglare layer is preferably carried out after the chemical strengthening process, and the formation of the antifouling layer is preferably carried out after the formation of the antireflection layer.

[0156] The glass article 100 can be manufactured through the above processes.

[0157] (Manufacturing method of in-vehicle display device)

[0158] The present invention also provides a display device (specifically, an in-vehicle display device) having a display cover glass and a display using the above glass article 100, and the second main surface side of the glass article 100 is bonded to the display.

[0159] By using the above glass article 100 as the display cover glass and bonding the second main surface 12 side to the display panel 3, a display device (in-vehicle display device) can be manufactured.

[0160] The present disclosure describes the following inventions. It should be noted that it is not limited thereto.

[0161] [1] A glass article having a first main surface, a second main surface, and an end surface connecting the first main surface and the second main surface, the end surface including a side surface portion and a curved first chamfer portion connecting the side surface portion and the first main surface,

[0162] An antireflection layer is provided on the first main surface and the first chamfer portion,

[0163] In a region where the angle formed by the first chamfer portion and the first main surface is greater than 0° and 40° or less, the average value Ra1 of the arithmetic mean roughness Ra of the surface of the glass article is 0.20 μm or less,

[0164] In a region where the angle formed by the first chamfer portion and the first main surface is greater than 80°, and the average value Ra3 of the arithmetic mean roughness Ra of the surface of the side surface portion of the glass article is 0.30 μm or more,

[0165] In a region where the angle formed by the first chamfer portion and the first main surface is 60° to 80°, the average value Ra2 of the arithmetic mean roughness Ra of the surface of the glass article satisfies the following formula (1).

[0166] 0.2 ≤ (Ra2 - Ra1) / (Ra3 - Ra1) ≤ 0.8 ··· (1)

[0167] [2] The glass article according to [1], wherein the width of the first chamfered portion is 0.5 mm to 5.0 mm.

[0168] [3] The glass article according to [1] or [2], wherein the width of the region of the first chamfered portion that forms an angle greater than 0° and 40° or less with the first main surface is 0.43 mm to 4.8 mm.

[0169] [4] The glass article according to any one of [1] to [3], wherein the arithmetic mean roughness Ra of the surface of the glass article at the point where the angle formed by the first chamfered portion and the first main surface is 40° 40° , the arithmetic mean roughness Ra of the surface of the glass article at the point where the angle formed by the first chamfered portion and the first main surface is 60° 60° , and the arithmetic mean roughness Ra of the surface of the glass article at the point where the angle formed by the first chamfered portion and the first main surface is 80° 80° are in the relationship of Ra 40° < Ra 60° < Ra 80° .

[0170] [5] The glass article according to any one of [1] to [4], wherein, regarding the reflected light of each measurement point of the first chamfered portion measured by the following measurement method, in the L * a * b * colorimetric system, the average value of a * of the measurement points satisfying L * ≥ 5 is 0 to 15.0.

[0171] (Measurement method)

[0172] In the first chamfered portion, with the perpendicular line at the point where the angle formed by the first chamfered portion and the first main surface is 45° as the reference, white light is incident from an angle of 10° to the side surface side, and an image is obtained using a two-dimensional spectral radiometer at an angle of 10° on the first main surface side. In the image, the measurement points are divided by each pixel, and the hue of each measurement point is calculated in the L * a * b * colorimetric system.

[0173] [6] The glass article according to any one of [1] to [5], wherein the hue of the reflected light of the first main surface satisfies -3 < a * a * b * in the colorimetric system and -3 < b * < 3 and -3 < b * < 3.

[0174] [7] The glass article according to any one of [1] to [6], wherein the end face includes a side face portion and a second chamfered portion connecting the side face portion and the second main face, and the parameter R defined in the following formula (2) satisfies formula (3).

[0175] R = 0.38·E cg -A / t-2.61·B / t + 4.38·C / t-10.6·D / t···(2)

[0176] R ≤ 23.58···(3)

[0177] Wherein, E in formula (2) cg is the Young's modulus (GPa) of the glass article, A is the width (mm) of the first chamfered portion, B is the width (mm) of the second chamfered portion, C is the thickness (mm) of the side face portion, D is the thickness (mm) of the first chamfered portion, and t is the thickness (mm) of the glass article.

[0178] [8] The width A of the first chamfered portion is 2.0 mm or less, and the ratio of the width A of the first chamfered portion to the thickness of the glass article, i.e., the glass article plate thickness ratio (A / t), is 0.77 or more.

[0179] The width B of the second chamfered portion is 1.0 mm to 2.0 mm.

[0180] The thickness C of the side face portion is 0.25 mm or more, and the ratio of the thickness C of the side face portion to the thickness of the glass article, i.e., the glass article plate thickness ratio (C / t), is 0.6 or less.

[0181] The glass article according to [7], wherein the ratio of the thickness D of the first chamfered portion to the thickness of the glass article, i.e., the glass article plate thickness ratio (D / t), is 0.2 to 0.7.

[0182] [9] The glass article according to any one of [1] to [8], wherein the antireflection layer is composed of a metal oxide film and is formed by alternately laminating a high refractive index layer with a refractive index of 1.9 or more at a wavelength of 550 nm and a low refractive index layer with a refractive index of 1.6 or less at a wavelength of 550 nm.

[0183]

[10] The glass article according to [9], wherein the number of the low refractive index layers is 1 to 6 layers.

[0184]

[11] The glass article according to any one of [1] to

[10] , wherein, in a region where the angle formed by the first chamfered portion and the first main surface is greater than 0° and 40° or less, the average value Ra1 of the arithmetic mean roughness Ra of the surface of the glass article is 0.15 μm or less.

[0185]

[12] The glass article according to any one of [1] to

[11] , wherein, in a region where the angle formed by the first chamfered portion and the first main surface is greater than 0° and 40° or less, the average value Ra1 of the arithmetic mean roughness Ra of the surface of the glass article is 0.10 μm or less.

[0186]

[13] The glass article according to any one of [1] to

[12] , wherein the average value Ra3 of the arithmetic mean roughness Ra of the surface of the glass article in a region where the angle formed by the first chamfered portion and the first main surface is greater than 80° and the side surface portion is 0.35 μm or more.

[0187]

[14] A display cover glass using the glass article according to any one of [1] to

[13] having a printed layer on the second main surface side.

[0188]

[15] The display cover glass according to

[14] , wherein an antiglare layer is provided on the first main surface side.

[0189]

[16] The display cover glass according to

[14] or

[15] , wherein an antifouling layer is provided on the antireflection layer.

[0190]

[17] A display device having the display cover glass according to any one of

[14] to

[16] and a display, and the second main surface side is bonded to the display.

[0191]

[18] A vehicle-mounted display device having the display cover glass according to any one of

[14] to

[16] and a display, and the second main surface side is bonded to the display.

[0192]

[19] A glass article, characterized in that it has a first main surface, a second main surface, and an end surface connecting the first main surface and the second main surface, the end surface includes a side surface portion, and a curved first chamfered portion connecting the side surface portion and the first main surface,

[0193] An antireflection layer is provided on the first main surface and the first chamfered portion,

[0194] In a region where the angle formed by the first chamfered portion and the first main surface is greater than 0° and 40° or less, the average value of the arithmetic mean roughness Ra of the surface of the glass article is 0.10 μm or less,

[0195] In a region where the angle formed by the first chamfered portion and the first major surface is greater than 40° and less than or equal to 80°, the average value of the arithmetic mean roughness Ra of the surface of the glass article is greater than 0.10 μm and less than 0.35 μm.

[0196] In a region where the angle formed by the first chamfered portion and the first major surface is greater than 80°, and for the side surface portion, the average value of the arithmetic mean roughness Ra of the surface of the glass article is 0.35 μm or more.

[0197] Examples

[0198] Next, the examples will be described. Examples 1, 2, 5, and 6 are examples, and Examples 3, 4, and 7 are comparative examples.

[0199] (Examples 1, 2)

[0200] In Examples 1 and 2, as the glass 10, Dragontrail manufactured by AGC Inc. was used, and a glass having a substantially rectangular major surface shape with a short side of 50 mm × a long side of 150 mm and a plate thickness t of 1.3 mm was prepared. The glass 10 is planar with a first major surface 11 and a second major surface 12, and the Young's modulus is 74 GPa.

[0201] By Figure 5 the method shown in (A) below, the end face 13 of the glass 10 was ground to form a side surface portion 14, a first chamfered portion 15, and a second chamfered portion 16. Diamond electroplated grinding wheels with mesh numbers #400 and #800 were used for grinding. At this time, the radius of curvature of the curved surface shape of the first chamfered portion 15 where the angle formed with the first major surface is 9° to 19° is 5.5 mm, and the radius of curvature where the angle formed is 45° is 0.4 mm. The width A of the first chamfered portion 15 is 1.67 mm, the thickness D is 0.69 mm, the width B of the second chamfered portion 16 is 0.15 mm, and the thickness C of the side surface portion 14 is 0.46 mm. That is, the parameter R represented by the above formula (1) is 22.45. In addition, the width of the region where the angle formed by the first chamfered portion 15 and the first major surface 11 is greater than 0° and less than or equal to 40° is 1.96 mm.

[0202] Next, by Figure 5 the method shown in (B) below, the end face 13 was polished. A grindstone containing cerium oxide was used for polishing.

[0203] Finally, an antireflection layer 20 was formed on the first major surface 11 side of the surface of the glass 10. The antireflection layer 20 was formed by sputtering, and the composition of each layer is as shown in Table 1 below.

[0204] [Table 1]

[0205] Table 1

[0206] Layer Refractive index Composition Thickness [nm] The 1st layer (the outermost layer) Low Silicon oxide 87 The 2nd layer High Niobium oxide 119 The 3rd layer Low Silicon oxide 38 The 4th layer High Niobium oxide 14

[0207] The glass article 100 is produced through the above processes.

[0208] The obtained glass article 100 is evaluated by the following method.

[0209] In Example 1, the surface roughness and color tone of the end face 13 are measured on the short side.

[0210] In Example 2, the surface roughness and color tone of the end face 13 are measured on the long side.

[0211] The results are shown in Tables 2 to 4 and Figure 6 .

[0212] The method for measuring the surface roughness is as follows.

[0213] The end face 13 of the glass article 100 is measured using a laser microscope (LEXT OLS5000 manufactured by Olympus, using a 50x lens). At this time, the glass is set so that the perpendicular line to the measurement point on the end face 13 coincides with the optical axis of the lens of the laser microscope.

[0214] A region of 256 μm in length and 256 μm in width is measured. At the longitudinal center of the measurement region, in a region of 50 μm in length and 256 μm in width, the arithmetic mean roughness Ra of 10 lines is calculated at 5-μm intervals over the entire transverse length, and the average value thereof is used as the roughness of the measurement point. It should be noted that the definition of the arithmetic mean roughness Ra is based on JIS B 0601:2.

[0215] It should be noted that on the surface of the glass article provided with an antireflection layer, the surface shape follows the surface shape of the glass, and the arithmetic mean roughness of the surface of the glass article is substantially the same as that of the surface of the glass.

[0216] The method for measuring the color tone is as follows.

[0217] In the first chamfered portion 15 of the glass article 100, with the perpendicular line at the point where the angle formed with the first main surface 11 of the first chamfered portion 15 is 45° as a reference, white light is incident from an angle of 10° to the side surface portion 14 side, and a spectroscopic spectrum is obtained using a two-dimensional spectro-radiometer at an angle of 10° on the first main surface 11 side. As the light source, illumination having sensitivity in the visible light region is used. Specifically, white LED illumination (manufactured by OPTEX FA Co., Ltd., OPF-S100X100W-PS) is used. As the detector, a spectro-radiometer ("SR-5000" manufactured by TechnoOptis Co., Ltd.) is used.

[0218] In the data obtained above, for each pixel, a total of 10 measurement points are divided, and in L * a* b * Calculate the hue of each measurement point in the colorimetric system. It should be noted that L * a * b * The calculation of the colorimetric system is based on JIS Z8781-4.

[0219] (Examples 3 and 4)

[0220] In Examples 3 and 4, the end face 13 is polished using brush polishing, and the side face 14 is also polished. In addition, the glass article 100 is produced in the same manner as in Examples 1 and 2. Further, cerium oxide is used as the polishing material used in the brush polishing.

[0221] Evaluate the obtained glass article 100 by the above method.

[0222] In Example 3, the surface roughness and hue of the end face 13 are measured on the short side.

[0223] In Example 4, the surface roughness and hue of the end face 13 are measured on the long side.

[0224] The results are shown in Table 2 and Tables 5 to 6 and Figure 6 .

[0225] [Table 2]

[0226] Table 2

[0227]

[0228] [Table 3]

[0229] Table 3

[0230]

[0231] [Table 4]

[0232] Table 4

[0233]

[0234] [Table 5]

[0235] Table 5

[0236]

[0237] [Table 6]

[0238] Table 6

[0239]

[0240] Based on the above results, in Example 1 and Example 2 which are examples, in the region where the angle formed by the first chamfered portion 15 and the first main surface 11 is greater than 0° and 40° or less, the average value Ra1 of the arithmetic mean roughness Ra of the surface of the glass article 100 is 0.20 μm or less. In the region where the formed angle is 60° - 80°, the average value Ra2 of the arithmetic mean roughness Ra satisfies formula (1). In the region where the formed angle is greater than 80° and the side surface portion, the average value Ra3 of the arithmetic mean roughness Ra is 0.30 μm or more. Additionally, it is known that in Example 1 and Example 2, for the L of the reflected light * a * b * the hue in the colorimetric system, for the a of the above measurement points satisfying L * ≥5 * the average value is 0 - 15.0, and the red color of the reflected light can be suppressed.

[0241] On the other hand, in Example 3 and Example 4 which are comparative examples, for the L of the reflected light * a * b * the hue in the colorimetric system, for the a of the above measurement points satisfying L * ≥5 * the average value is greater than 15.0, and red discoloration at the end portion occurs.

[0242] In addition, the parameter R of the glass article in Example 1 and Example 2 is 22.45, which satisfies formula (3), so the impact resistance of the end face 13 is also excellent.

[0243] (Example 5, 6)

[0244] In Example 5 and Example 6, as the glass 10, Dragontrail manufactured by AGC is used, and a glass with a substantially rectangular main surface shape of short side 50 mm × long side 150 mm and plate thickness t of 1.3 mm is prepared. The glass 10 is planar with a first main surface 11 and a second main surface 12, and the Young's modulus is 74 GPa.

[0245] Through Figure 5The end face 13 of the glass 10 is ground by the method shown in (A) to form a side face portion 14, a first chamfered portion 15, and a second chamfered portion 16. Diamond electroplated grinding wheels with mesh numbers #400 and #800 are used for grinding. At this time, in the curved surface shape of the first chamfered portion 15, the radius of curvature of the angle formed with the first main surface is 2.4 mm for an angle of 9° to 30°, and the radius of curvature of the angle formed at 45° is 0.2 mm. The width A of the first chamfered portion 15 is 1.48 mm, the thickness D is 0.65 mm, the width B of the second chamfered portion 16 is 0.15 mm, and the thickness C of the side face portion 14 is 0.5 mm. That is, the parameter R represented by the above formula (1) is 23.07. In addition, the width of the region of the first chamfered portion 15 where the angle formed with the first main surface 11 is greater than 0° and 40° or less is 1.60 mm.

[0246] Next, the end face 13 is polished in the same manner as in Examples 1 and 2, and finally, an antireflection layer 20 is formed on the first main surface 11 side of the surface of the glass 10.

[0247] The glass article 100 is manufactured through the above steps.

[0248] The obtained glass article 100 is evaluated by the above method.

[0249] In Example 5, the surface roughness and color tone of the end face 13 are measured on the short side.

[0250] In Example 6, the surface roughness and color tone of the end face 13 are measured on the long side.

[0251] The results are shown in Tables 7 to 9 and Figure 7 .

[0252] The method for measuring the surface roughness is the same as in Examples 1 to 4.

[0253] For the method of measuring the color tone, a total of 9 measurement points are divided for each pixel, and the color tone of each measurement point is calculated in the L * a * b * colorimetric system, or the color tone of each measurement point is calculated in the L * a * b * colorimetric system. Except for this, it is the same as in Examples 1 to 4.

[0254] (Example 7)

[0255] In Example 7, brush grinding is used for grinding the end face 13, and grinding of the side face portion 14 is also included. Except for this, the glass article 100 is manufactured in the same manner as in Examples 1 and 2. In addition, cerium oxide is used as the abrasive material used in the brush grinding.

[0256] In Example 7, the surface roughness and color tone of the end face 13 were measured on the long side.

[0257] The results are shown in Table 7 and Table 10 and Figure 7 .[Table 7] Table 7

[0258]

[0259] [Table 8]

[0260] Table 8

[0261]

[0262] [Table 9]

[0263] Table 9

[0264]

[0265] [Table 10]

[0266] Table 10

[0267]

[0268] Based on the above results, it can be seen that in Examples 5 and 6 as examples, in the region where the angle formed by the first chamfered portion 15 and the first main surface 11 is greater than 0° and 40° or less, the average value Ra1 of the arithmetic mean roughness Ra of the surface of the glass article 100 is 0.20 μm or less. In the region where the formed angle is 60° to 80°, the average value Ra2 of the arithmetic mean roughness Ra satisfies Equation (1). In the region where the formed angle is greater than 80° and the side surface portion, the average value Ra3 of the arithmetic mean roughness Ra is 0.30 μm or more. For the L * a * b * hue in the colorimetric system, the average value of a * ≥5 for the above measurement points is 0 to 15.0, and the red color of the reflected light can be suppressed. *

[0269] On the other hand, in Example 7 as a comparative example, for the L * a * b * hue in the colorimetric system, the average value of a * ≥5 for the above measurement points is greater than 15.0, resulting in red discoloration at the end. *

[0270] In addition, the parameter R of the glass article in Examples 5 and 6 is 23.07, which satisfies Equation (3), so the impact resistance of the end face 13 is also excellent.

[0271] In addition, for the glass articles of Examples 1 to 4 manufactured above, the average value of the arithmetic mean roughness Ra of the surface of the glass article in the region where the angle formed by the first chamfered portion and the first main surface is greater than 0° and 40° or less, the average value of the arithmetic mean roughness Ra of the surface of the glass article in the region where the angle formed by the first chamfered portion and the first main surface is greater than 40° and 80° or less, and the average value of the arithmetic mean roughness Ra of the surface of the glass article in the region where the angle formed by the first chamfered portion and the first main surface is greater than 80° and the side surface portion are shown in Table 11.

[0272] [Table 11]

[0273] Table 11

[0274]

[0275] Although the present invention has been described in detail with reference to specific embodiments, those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit and scope of the present invention. This application is based on a Japanese patent application (Japanese Patent Application No. 2022-185227) filed on November 18, 2022, the content of which is incorporated herein by reference.

[0276] Symbolic Explanation

[0277] 1 Steering shaft

[0278] 2 In-vehicle display device

[0279] 3 Display panel

[0280] 100 Glass article

[0281] 10 Glass

[0282] 11 First main surface

[0283] 12 Second main surface

[0284] 13 End face

[0285] 14 Side surface portion

[0286] 15 First chamfered portion

[0287] 16 Second chamfered portion

[0288] 20 Anti-reflection layer

[0289] 40 Rotating grindstone (for grinding)

[0290] 50 Rotating grindstone (for polishing)

[0291] t Film thickness

Claims

1. A glass article having a first main surface, a second main surface, and an end surface connecting the first main surface and the second main surface, the end surface including a side portion and a curved first chamfered portion connecting the side portion and the first main surface, wherein an antireflection layer is provided on the first main surface and the first chamfered portion, in a region where the angle formed by the first chamfered portion and the first main surface is greater than 0° and 40° or less, the average value Ra1 of the arithmetic mean roughness Ra of the surface of the glass article is 0.20 μm or less, in a region where the angle formed by the first chamfered portion and the first main surface is greater than 80° and the average value Ra3 of the arithmetic mean roughness Ra of the surface of the glass article in the side portion is 0.30 μm or more, in a region where the angle formed by the first chamfered portion and the first main surface is 60° to 80°, the average value Ra2 of the arithmetic mean roughness Ra of the surface of the glass article satisfies the following formula (1), 0.2 ≤ (Ra2 - Ra1) / (Ra3 - Ra1) ≤ 0.8 ··· (1).

2. The glass article according to claim 1, wherein, The width of the first chamfered portion is 0.5 mm to 5.0 mm.

3. The glass article according to claim 1, wherein, The width of the region where the angle formed by the first chamfered portion and the first main surface is greater than 0° and 40° or less is 0.43 mm to 4.8 mm.

4. The glass article according to claim 1, wherein, The arithmetic mean roughness Ra of the surface of the glass article at the point where the angle formed by the first chamfered portion and the first main surface is 40° 40° , the arithmetic mean roughness Ra of the surface of the glass article at the point where the angle formed by the first chamfered portion and the first main surface is 60° 60° , and the arithmetic mean roughness Ra of the surface of the glass article at the point where the angle formed by the first chamfered portion and the first main surface is 80° 80° are related such that Ra 40° <Ra 60° <Ra 80° .

5. The glass article according to claim 1, wherein, Regarding the reflected light of each measurement point of the first chamfered portion measured by the following measurement method in L * a * b * the hue in the colorimetric system satisfies L * ≥5, the average value of a * of the measurement points is 0 to 15.0, Measurement method: At the first chamfered portion, using the perpendicular line at the point where the angle formed by the first chamfered portion and the first main surface is 45° as a reference, white light is incident on the side surface side at an angle of 10°, and an image is acquired using a two-dimensional spectral radiometer at an angle of 10° on the first main surface side. In the image, the measurement points are divided for each pixel, and in the L * a * b * hue of each of the measurement points is calculated in the colorimetric system.

6. The glass article according to claim 1, wherein, The hue of the reflected light of the first main surface satisfies -3 < a * a * b * in the colorimetric system and -3 < a * < 3 and -3 < b * < 3.

7. The glass article according to claim 1, wherein, The end surface includes a side portion and a second chamfered portion connecting the side portion and the second main surface, a parameter R defined in the following formula (2) satisfies formula (3), R = 0.38·E cg -A / t - 2.61·B / t + 4.38·C / t - 10.6·D / t ···(2) R≤23.58···(3) Among them, E in formula (2) cg is the Young's modulus of the glass article, A is the width of the first chamfered portion, B is the width of the second chamfered portion, C is the thickness of the side surface portion, D is the thickness of the first chamfered portion, t is the thickness of the glass article, the unit of Young's modulus is GPa, the unit of width is mm, and the unit of thickness is mm.

8. The glass article according to claim 7, wherein, the width A of the first chamfered portion is 2.0 mm or less, and the ratio of the width A of the first chamfered portion to the thickness of the glass article, i.e., the glass article plate thickness ratio A / t, is 0.77 or more, the width B of the second chamfered portion is 1.0 mm to 2.0 mm, the thickness C of the side portion is 0.25 mm or more, and the ratio of the thickness C of the side portion to the thickness of the glass article, i.e., the glass article plate thickness ratio C / t, is 0.6 or less, the ratio of the thickness D of the first chamfered portion to the thickness of the glass article, i.e., the glass article plate thickness ratio D / t, is 0.2 to 0.

7.

9. The glass article according to claim 1, wherein, The antireflection layer is composed of a metal oxide film and is formed by alternately laminating a high refractive index layer having a refractive index of 1.9 or more at a wavelength of 550 nm and a low refractive index layer having a refractive index of 1.6 or less at a wavelength of 550 nm.

10. The glass article according to claim 9, wherein, The low refractive index layer is 1 to 6 layers.

11. The glass article according to claim 1, wherein, In a region where the angle formed by the first chamfered portion and the first main surface is greater than 0° and 40° or less, the average value Ra1 of the arithmetic mean roughness Ra of the surface of the glass article is 0.15 μm or less.

12. The glass article according to claim 1, wherein, In a region where the angle formed by the first chamfered portion and the first main surface is greater than 0° and 40° or less, the average value Ra1 of the arithmetic mean roughness Ra of the surface of the glass article is 0.10 μm or less.

13. The glass article according to claim 1, wherein, In a region where the angle formed by the first chamfered portion and the first main surface is greater than 80° and the average value Ra3 of the arithmetic mean roughness Ra of the surface of the glass article in the side portion is 0.35 μm or more.

14. A display cover glass, which is used for the glass article according to any one of claims 1 to 13 having a printed layer on the second main surface side.

15. The display cover glass according to claim 14, wherein, It has an antiglare layer on the first main surface side.

16. The display cover glass according to claim 14, wherein, It has an antifouling layer on the antireflection layer.

17. A display device, which has the display cover glass according to claim 14 and a display, and the second main surface side is bonded to the display.

18. A vehicle-mounted display device, which has the display cover glass according to claim 14 and a display, and the second main surface side is bonded to the display.

Images