Cover member for display, method for manufacturing same, and display

Abstract

Provided is a cover member for a display, the cover member having excellent visibility with respect to an image displayed on the display and being capable of easily recognizing an operation unit displayed on the display with a tactile sense. The cover member (1) for a display is used for a display (10), a surface (2) of the cover member (1) has a first region (3) as a surface treatment region and a second region (4) having a surface roughness different from that of the first region (3), a boundary (5) is formed between the first region (3) and the second region (4), the first region (3) has recesses and projections, and the second region (4) has a surface roughness different from that of the first region (3). When the cutoff value of the high-pass filter [lambda] c is 14 [mu] m and the cutoff value of the low-pass filter [lambda] s is 0.35 [mu] m, the arithmetic average height Sa1 is 0.5-200 nm inclusive, the average length RSm1 of roughness curve elements is 0.1-5 [mu] m inclusive, and the maximum peak height Sp1 < the maximum valley depth Sv1 is satisfied.

Description

Technical Field

[0001] The present invention relates to a display cover member, a method for manufacturing the display cover member, and a display using the display cover member. Background Art

[0002] In recent years, more and more personal computers, tablet computers, and home appliances have been equipped with touch-panel displays. Such displays sometimes display buttons or keyboards as operating units. However, the position of buttons displayed on the display is difficult to determine simply by touching them. In addition, the keyboard displayed on the display does not contain information that can be obtained through touch, so typing requires visual information, which significantly reduces operability. Therefore, there is a demand for displays that allow easy tactile recognition of operating units such as buttons or keyboards displayed on the display.

[0003] For example, Patent Document 1 below discloses a keyboard using a glass component. Patent Document 1 describes a keyboard having multiple keyboard areas for receiving user input and non-keyboard areas surrounding the keyboard areas, with one of the keyboard areas and the non-keyboard area being a glass component, while the other is made of a material different from the glass component. Patent Document 1 also describes a display unit such as a monitor that can be provided below the keyboard area.

[0004] Furthermore, Patent Document 2 below discloses an electronic device having, on an end surface region of a cover glass, a first region having a first surface roughness corresponding to touch panel input, and a second region having a second surface roughness different from the first surface roughness. Patent Document 2 suggests that with such a configuration, a user can identify the operation position of the end surface region of the cover glass through tactile sensation.

[0005] Prior art literature Patent Literature Patent Document 1: Japanese Patent Application Laid-Open No. 2020-106871 Patent Document 2: Japanese Patent Application Laid-Open No. 2018-169883 Summary of the Invention

[0006] Problems to be solved by the invention However, if the keyboard area and non-keyboard area are made of different materials, as in Patent Document 1, the joint portion between them will be visible when the image is displayed on the display, and the visibility of the image may be reduced. In addition, as in Patent Document 2, when a method is used to make the surface roughness of the area corresponding to the input of the touch panel different, if the surface roughness is reduced, the visibility of the image displayed on the display will be improved, but the difference in tactile feel between the operating part and the area outside the operating part may sometimes be reduced. On the other hand, if the surface roughness is increased, although the tactile information of the operating part is easy to obtain, the visibility of the image displayed on the display may sometimes be reduced.

[0007] An object of the present invention is to provide a display cover member that provides excellent visibility of an image displayed on a display and facilitates tactile recognition of an operation portion displayed on the display, a method for manufacturing the display cover member, and a display using the display cover member.

[0008] Technical solutions to problems A display cover member, a method for manufacturing the display cover member, and each embodiment of a display that solves the above-mentioned problems will be described.

[0009] A display cover member according to a first embodiment of the present invention is a cover member for a display, wherein a surface of the cover member includes a first region serving as a surface-treated region and a second region having a surface roughness different from that of the first region, wherein a boundary is formed between the first region and the second region. The above-mentioned first region has the following concave-convexity. When the cutoff value of the high-pass filter λc is set to 14μm and the cutoff value of the low-pass filter λs is set to 0.35μm, the arithmetic mean height Sa1 is greater than 0.5nm and less than 200nm, and the average length RSm1 of the roughness curve element is greater than 0.1μm and less than 5μm, satisfying the maximum peak height Sp1<maximum valley depth Sv1.

[0010] The display cover member of aspect 2 may be that in aspect 1, the first area is an area where an operation unit is displayed on the display, and the second area is an area other than the area where the operation unit is displayed on the display.

[0011] The display cover member according to aspect 3 may be the display cover member according to aspect 1, wherein the first area is an area other than an area where an operation unit is displayed on the display, and the second area is an area where the operation unit is displayed on the display.

[0012] The display cover member of aspect 4 may include a plurality of the first regions in aspect 1, and may include a pattern in which the first regions are arranged at intervals in a predetermined direction in a region where the display operation unit is displayed.

[0013] The display cover component of method 5 is preferably such that, in any one of methods 1 to 4, when the cutoff value of the high-pass filter λc is set to 14 μm and the cutoff value of the low-pass filter λs is set to 0.35 μm, the absolute value of the difference between the arithmetic mean height Sa1 of the above-mentioned first area and the arithmetic mean height Sa1 of the above-mentioned second area is greater than 0.5 nm and less than 200 nm.

[0014] The display cover component of method 6 is preferably such that in method 5, the second region has the following projections and depressions, and when the cutoff value of the high-pass filter λc is set to 14 μm and the cutoff value of the low-pass filter λs is set to 0.35 μm, the arithmetic mean height Sa1 is greater than 0.1 nm and less than 50 nm, and the average length RSm1 of the roughness curve element is greater than 0.1 μm and less than 5 μm.

[0015] The display cover member of aspect 7 is preferably such that, in any one of aspects 1 to 6, the maximum peak height Sp1 of the concavo-convex portion of the first region is 5 nm to 400 nm, and the maximum valley depth Sv1 of the concavo-convex portion of the first region is 7 nm to 600 nm.

[0016] The display cover member according to aspect 8 is preferably any one of aspects 1 to 7, wherein the haze of the first region is 20% or less in a wavelength range of 380 nm to 780 nm.

[0017] The display cover member of aspect 9 is preferably such that, in any one of aspects 1 to 8, when the irregularities in the first region are first irregularities, the first region further includes second irregularities having a roughness curve element average length RSm greater than that of the first irregularities.

[0018] In the display cover member of aspect 10, in aspect 9, when the cutoff value of the high-pass filter λc is set to four times the average length RSm2 of the roughness curve elements of the second unevenness, and the cutoff value of the low-pass filter λs is set to 27 μm, the maximum height Rz2 of the second unevenness is not less than 1 nm and not more than 500 nm, and the average length RSm2 of the roughness curve elements of the second unevenness is not less than 100 μm and not more than 2000 μm. The cutoff value of the high-pass filter λc of the second unevenness can be a value obtained by quadrupling the value of the average length RSm of the provisional roughness curve elements obtained by predicting timing without a filter.

[0019] The display cover component involved in mode 11 of the present invention is a cover component for a display, characterized in that the surface of the above-mentioned cover component has a first area as a surface treatment area, and a second area having a surface roughness different from the above-mentioned first area, and a boundary is formed between the above-mentioned first area and the above-mentioned second area, and the above-mentioned first area has: when the cutoff value of the high-pass filter λc is set to 2.5μm, the arithmetic mean height Sa3 is greater than 0.5nm and less than 200nm, the average length RSm3 of the roughness curve element is greater than 0.1μm and less than 5μm, and the first concave-convex satisfying the maximum peak height Sp3<maximum valley depth Sv3; and when the cutoff value of the high-pass filter λc is set to 14μm and the cutoff value of the low-pass filter λs is set to 0.35μm, the maximum height Sz4 is greater than 20nm and less than 500nm, and the average length RSm4 of the roughness curve element is greater than 3μm and less than 30μm.

[0020] The display cover member of aspect 12 is preferably such that in aspect 11, when the cutoff value of the high-pass filter λc is set to 2.5 μm, the absolute value of the difference between the arithmetic mean height Sa3 of the first region and the arithmetic mean height Sa3 of the second region is 0.5 nm or more and 200 nm or less.

[0021] The manufacturing method of a display involved in mode 13 of the present invention is used to manufacture a cover component for a display of any one of modes 1 to 12, and the manufacturing method is characterized in that it includes: a process of preparing a transparent component to become the above-mentioned cover component; and a process of forming the above-mentioned first area by sandblasting a portion of the surface of the above-mentioned transparent component.

[0022] The method for manufacturing a display according to aspect 14 is preferably such that, in aspect 13, the sandblasting is wet sandblasting.

[0023] A display according to a fifteenth aspect of the present invention is characterized by including the display cover member according to any one of the first to twelfth aspects.

[0024] Effects of the Invention According to the present invention, it is possible to provide a display cover member that provides excellent visibility of an image displayed on a display and allows easy tactile recognition of an operation portion displayed on the display, a method for manufacturing the display cover member, and a display using the display cover member. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic front view showing a cover member according to the first embodiment of the present invention.

[0026] Figure 2 It is a diagram for explaining a measured cross-sectional curve in a modified example of the concavity and convexity.

[0027] Figure 3 It is a schematic front view showing a cover member according to a second embodiment of the present invention.

[0028] Figure 4 It is a schematic perspective view showing a cover member according to a third embodiment of the present invention.

[0029] Figure 5 It is a schematic plan view showing a modified example of the area where the operation unit is displayed on the display.

[0030] Figure 6 (a) and (b) are schematic plan views showing modified examples of the area where the operation unit is displayed in the display. DETAILED DESCRIPTION

[0031] Hereinafter, preferred embodiments will be described. However, the following embodiments are merely illustrative, and the present invention is not limited to the following embodiments. In addition, in each of the drawings, components having substantially the same function are sometimes referred to with the same reference numerals.

[0032] [First embodiment] Figure 1 It is a schematic front view showing the display cover member according to the first embodiment of the present invention.

[0033] like Figure 1 As shown, a display cover member 1 (hereinafter sometimes simply referred to as "cover member 1") is a cover member used for a display 10. Cover member 1 is disposed on the front surface (front face) of display 10. Display 10 is not particularly limited, and examples thereof include a liquid crystal display, a plasma display, and an organic EL display.

[0034] There are no particular limitations on the cover member 1, and a transparent member can be used. Examples of the transparent member include glass members, ceramic members, and resin members. Among them, the cover member 1 is preferably a glass member such as a glass plate.

[0035] The material of the glass member is not particularly limited, and examples thereof include quartz glass, soda-lime glass, alkali-free glass, aluminosilicate glass, borosilicate glass, fluoride glass, and chalcogenide glass, etc. These glasses may be used alone or in combination of two or more.

[0036] The shape of the cover member 1 is not particularly limited and can be formed into any appropriate shape such as a rectangular plate. The thickness of the cover member 1 is not particularly limited, but is preferably 0.05 mm or greater, more preferably 0.1 mm or greater, and even more preferably 0.4 mm or greater, and is preferably 1.5 mm or less, more preferably 1.1 mm or less, and even more preferably 0.8 mm or less.

[0037] like Figure 1 As shown, a first region 3 and a second region 4 are provided on the surface 2 of the cover member 1. In addition, a boundary 5 is formed between the first region 3 and the second region 4.

[0038] In the present embodiment, the first area 3 is an area where buttons serving as an operation unit are displayed on the display 10. The second area 4 is an area other than the area where buttons serving as an operation unit are displayed on the display 10.

[0039] The first region 3 is a surface-treated region that has been subjected to surface treatment and has irregularities on its surface. The arithmetic mean height Sa1 of the irregularities in the first region 3 is between 0.5 nm and 200 nm. The average length RSm1 of the roughness curve elements in the irregularities in the first region 3 is between 0.1 μm and 5 μm. Furthermore, the irregularities in the first region 3 satisfy the condition that maximum peak height Sp1 is less than maximum valley depth Sv1.

[0040] The "arithmetic mean height Sa1," "mean length RSm1 of the roughness curve elements," "maximum peak height Sp1," and "maximum valley depth Sv1" are values ​​obtained when the cutoff value of the high-pass filter λc, used to cut off long-wavelength components from the profile curve representing the cross-sectional shape of the unevenness of the first region 3, is set to 14 μm, and the cutoff value of the low-pass filter λs, used to cut off short-wavelength components from the profile curve representing the cross-sectional shape of the unevenness of the first region 3, is set to 0.35 μm. These measurement conditions will sometimes be referred to as Condition A.

[0041] The "arithmetic mean height Sa1" is a parameter defined by ISO 25178 and is obtained by expanding the measured cross-sectional curve representing the cross-sectional shape of the concavities and convexities into a surface. Specifically, the "arithmetic mean height Sa1" can be calculated by averaging the absolute values ​​of the heights Zn of the concavities and convexities within a predetermined three-dimensional element region, measured from the average surface (Sa1 = (Σ|Zn|) / n).

[0042] The "average length RSm1 of the roughness curve elements" is a parameter defined in JIS B0601:2001 and represents the average pitch between adjacent concave and convex portions in a profile curve representing a concave-convex cross-sectional shape. Hereinafter, the "average length RSm1 of the roughness curve elements" may be referred to as "average length RSm1."

[0043] "Maximum peak height Sp1" and "maximum valley depth Sv1" are parameters defined by ISO 25178 and are obtained by expanding the profile curve representing the cross-sectional shape of the concave and convex surfaces into a surface. Specifically, the maximum peak height Sp1 is the height from the peak (MAX) of the largest peak relative to the average surface of the concave and convex surfaces of the first region 3. Furthermore, the maximum valley depth Sv1 is the absolute value of the depth from the bottom (MAX) of the largest valley relative to the average surface of the concave and convex surfaces of the first region 3. The "average surface" is calculated as the average value of the surface roughness curve, and its height relative to the roughness curve is 0.

[0044] The second region 4 has a different surface roughness than the first region 3. The second region 4 is either a non-surface-treated region or a region that has been surface-treated differently from the first region 3. A surface-treated region that has been surface-treated differently from the first region 3 refers to a region that has been surface-treated using a different treatment method or conditions than the first region 3. In other words, the second region 4 need not be surface-treated the same as the first region 3; any surface treatment may be applied as long as it is different from the first region 3. Furthermore, the second region 4 may not be surface-treated at all.

[0045] Since the cover member 1 of the present embodiment has the above-described configuration, the visibility of the image displayed on the display 10 is excellent, and the operation portion displayed on the display 10 can be easily recognized by touch. This can be explained as follows.

[0046] Conventionally, operating portions such as buttons and keyboards displayed in the form of images on a touch panel display have had the problem that their positions are difficult to determine simply by touching them with a finger.

[0047] Furthermore, in the method of differentiating the surface roughness of the operating unit displayed on the display from that of the area outside the operating unit, increasing the surface roughness of the operating unit facilitates obtaining tactile information about the operating unit. However, when other images are displayed in the operating unit area, the visibility of these other images, other than buttons or keyboards, is reduced. On the other hand, decreasing the surface roughness of the operating unit improves the visibility of these other images displayed on the display, but the difference in tactile feel between the operating unit and the area outside the operating unit is reduced, making it difficult to determine the position of the operating unit using only a finger touch.

[0048] In contrast, in the cover member 1 of this embodiment, by increasing the arithmetic mean height Sa1 of the concavities and convexities in the first region 3 corresponding to the operating portion within a specific range and reducing the average length RSm1 of the roughness curve elements within a specific range, thereby ensuring that the maximum peak height Sp1 is less than the maximum valley depth Sv1, tactile information about the operating portion can be easily obtained. Furthermore, the second region 4 outside the operating portion has a different surface roughness than the first region 3, and the second region 4 has different concavities and convexities than the first region 3. Therefore, tactile information about the operating portion can be more easily obtained at the boundary 5 between the first region 3 and the second region 4. Therefore, in the cover member 1, the operating portion displayed on the display 10 can be easily recognized by touch. Furthermore, the boundary 5 can be formed solely by the difference in concavities and convexities as described above. In cases where tactile information about the operating portion is particularly important, a groove or peak can be provided at the location of the boundary 5.

[0049] Furthermore, in the cover member 1 of this embodiment, by setting the arithmetic mean height Sa1 within a specific range and reducing the mean length RSm1 of the roughness curve elements within a specific range, it is possible to improve the visibility of the image displayed on the display 10 while also facilitating the acquisition of tactile information from the operating portion. Therefore, even when an image is displayed on the entire surface of the display 10, or when an image other than buttons or a keyboard is displayed in the first area 3 corresponding to the operating portion, visibility can be improved.

[0050] The arithmetic mean height Sa1 of the concavo-convex portions of the first region 3 is 0.5 nm or greater, preferably 1 nm or greater, more preferably 2 nm or greater, and even more preferably 3 nm or greater, and is 200 nm or less, preferably 150 nm or less, more preferably 100 nm or less, even more preferably 60 nm or less, even more preferably 50 nm or less, even more preferably 40 nm or less, and particularly preferably 25 nm or less. When the arithmetic mean height Sa1 of the concavo-convex portions of the first region 3 is at least the lower limit, the operation portion displayed on the display 10 can be more easily recognized by touch. Furthermore, when the arithmetic mean height Sa1 of the concavo-convex portions of the first region 3 is at most the upper limit, the visibility of the image displayed on the display 10 can be further improved.

[0051] The average length RSm1 of the roughness curve elements of the concave and convex portions of the first region 3 is 0.1 μm or greater, preferably 0.2 μm or greater, more preferably 0.3 μm or greater, and even more preferably 0.4 μm or greater, and is 5 μm or less, preferably 4.5 μm or less, more preferably 4 μm or less, and even more preferably 3.5 μm or less. When the average length RSm1 of the concave and convex portions of the first region 3 is greater than the lower limit, the operation portion displayed on the display 10 can be more easily recognized by touch. Furthermore, when the average length RSm1 of the concave and convex portions of the first region 3 is less than the upper limit, the visibility of the image displayed on the display 10 can be further improved.

[0052] The maximum peak height Sp1 of the concavo-convex portions of the first region 3 is preferably 5 nm or greater, more preferably 10 nm or greater, and even more preferably 15 nm or greater, and is preferably 400 nm or less, more preferably 300 nm or less, even more preferably 250 nm or less, even more preferably 225 nm or less, and particularly preferably 200 nm or less. When the maximum peak height Sp1 of the concavo-convex portions of the first region 3 is within the above range, the visibility of the image displayed on the display 10 can be further improved, and tactile information on the operating portion can be more easily obtained.

[0053] The maximum valley depth Sv1 of the unevenness of the first region 3 is preferably 7 nm or greater, more preferably 10 nm or greater, and even more preferably 15 nm or greater, and is preferably 600 nm or less, more preferably 500 nm or less, more preferably 480 nm or less, and even more preferably 450 nm or less. When the maximum valley depth Sv1 of the unevenness of the first region 3 is within the above range, the visibility of the image displayed on the display 10 can be further improved, and tactile information on the operation portion can be more easily obtained.

[0054] The maximum height Sz1 of the concavo-convex portions of the first region 3 is preferably 12 nm or greater, more preferably 20 nm or greater, and even more preferably 25 nm or greater, and is preferably 800 nm or less, more preferably 700 nm or less, even more preferably 650 nm or less, and even more preferably 500 nm or less. When the maximum height Sz1 of the concavo-convex portions of the first region 3 is within the above range, the visibility of the image displayed on the display 10 can be further improved, and tactile information on the operating portion can be more easily obtained.

[0055] The kurtosis Sku1 of the concavities and convexities of the first region 3 is preferably 3.2 or greater, more preferably 3.4 or greater, and even more preferably 3.5 or greater, and is preferably 25 or less, more preferably 20 or less, and even more preferably 16 or less. When the kurtosis Sku1 of the concavities and convexities of the first region 3 is within the above range, the visibility of the image displayed on the display 10 can be further improved, and tactile information of the operation portion can be further easily obtained.

[0056] Furthermore, the skewness Ssk1 ​​of the concavo-convex portion of the first region 3 is preferably not less than -3, more preferably not less than -2.5, and even more preferably not less than -2, and is preferably not more than -0.01, more preferably not more than -0.1, even more preferably not more than -0.2, and even more preferably not more than -0.3. When the skewness Ssk1 ​​of the concavo-convex portion of the first region 3 is within the above range, the visibility of the image displayed on the display 10 can be further improved, and tactile information on the operating portion can be more easily obtained.

[0057] The maximum height Sz1, kurtosis Sku1, and skewness Ssk1 ​​of the concavities and convexities of the first region 3 can be measured according to ISO 25178. The maximum height Sz1, kurtosis Sku1, and skewness Ssk1 ​​are also measured under condition A.

[0058] In this embodiment, the absolute value of the difference between the arithmetic mean height Sa1 of the concave and convex portions of the first region 3 and the arithmetic mean height Sa1 of the concave and convex portions of the second region 4 is preferably 0.5 nm or greater, more preferably 1 nm or greater, even more preferably 2 nm or greater, even more preferably 5 nm or greater, even more preferably 10 nm or greater, and particularly preferably 15 nm or greater, and is preferably 200 nm or less, more preferably 180 nm or less, even more preferably 150 nm or less, and even more preferably 100 nm or less. In this case, the boundary 5 between the first region 3 and the second region 4 can be more easily identified by touch, and the position information of the operating portion can be more easily obtained by touch. Furthermore, the image displayed on the display 10 is less likely to exhibit deviations, and the visibility of the image displayed on the display 10 can be further improved.

[0059] The arithmetic mean height Sa1 of the concave and convex parts of the second region 4 is preferably greater than 0.1 nm, more preferably greater than 0.15 nm, further preferably greater than 0.2 nm, and particularly preferably greater than 0.25 nm, and is preferably less than 50 nm, more preferably less than 10 nm, further preferably less than 5 nm, further more preferably less than 3 nm, and particularly preferably less than 1 nm.

[0060] The average length RSm1 of the roughness curve elements of the concave and convex parts of the second region 4 is preferably greater than 0.1 μm, more preferably greater than 0.2 μm, further preferably greater than 0.3 μm, and particularly preferably greater than 0.4 μm, and is preferably less than 5 μm, more preferably less than 3 μm, further preferably less than 2 μm, and particularly preferably less than 1.5 μm.

[0061] The maximum peak height Sp1 of the concavities and convexities of the second region 4 is preferably 1 nm or more, more preferably 1.5 nm or more, further preferably 1.8 nm or more, and is preferably 40 nm or less, more preferably 20 nm or less, further preferably 10 nm or less.

[0062] The maximum valley depth Sv1 of the concavities and convexities of the second region 4 is preferably 0.5 nm or more, more preferably 1 nm or more, further preferably 2 nm or more, and is preferably 40 nm or less, more preferably 20 nm or less, further preferably 10 nm or less.

[0063] The maximum height Sz1 of the concavities and convexities of the second region 4 is preferably 0.5 nm or more, more preferably 1 nm or more, further preferably 2 nm or more, and is preferably 50 nm or less, more preferably 30 nm or less, further preferably 10 nm or less.

[0064] The kurtosis Sku1 of the concavity and convexity of the second region 4 is preferably 2.1 or more, more preferably 2.5 or more, further preferably 2.8 or more, and is preferably 7 or less, more preferably 5 or less, further preferably 4.5 or less, further more preferably 4.0 or less, and particularly preferably 3.4 or less.

[0065] The skewness Ssk1 ​​of the concavities and convexities of the second region 4 is preferably not less than -0.5, more preferably not less than -0.4, and even more preferably not less than -0.2, and is preferably not more than 1, more preferably not more than 0.9, and even more preferably not more than 0.5.

[0066] In addition, the arithmetic mean height Sa1, average length RSm1 of the roughness curve element, maximum peak height Sp1, maximum valley depth Sv1, maximum height Sz1, kurtosis Sku1 and skewness Ssk1 ​​of the concavity and convexity of the second region 4 can be measured by the same method as the concavity and convexity of the first region 3.

[0067] Furthermore, the haze of the first region 3 in the wavelength range of 380 nm to 780 nm is preferably 0.05% or more, more preferably 0.1% or more, and even more preferably 0.5% or more, and is preferably 20% or less, more preferably 15% or less, even more preferably 10% or less, even more preferably less than 10%, and particularly preferably 5% or less. In this case, the visibility of the image displayed on the display 10 can be further improved.

[0068] The haze of the second region 4 in the wavelength range of 380 nm to 780 nm is preferably 0.05% or greater, more preferably 0.1% or greater, even more preferably 0.5% or greater, even more preferably 1% or greater, and particularly preferably 2% or greater, and is preferably 15% or less, more preferably 10% or less, even more preferably 5% or less, and particularly preferably 3% or less. In this case, the visibility of the image displayed on the display 10 can be further improved.

[0069] While it is desirable to minimize the difference in haze between the first region 3 and the second region 4, in practice, the absolute value of the difference between the haze of the first region 3 and the haze of the second region 4 is preferably 0.1% or greater, more preferably 0.5% or greater, and even more preferably 1% or greater. Furthermore, the absolute value of the difference between the haze of the first region 3 and the haze of the second region 4 is preferably 10% or less, more preferably 5% or less, and even more preferably 3% or less. In this case, deviations in the image displayed on the display 10 can be further reduced, and the visibility of the image displayed on the display 10 can be further improved.

[0070] (Manufacturing Method) Next, an example of a method for manufacturing the cover member 1 will be described.

[0071] The unevenness of the first region 3 of the cover member 1 can be formed by, for example, performing a surface treatment such as sandblasting. Examples of the sandblasting treatment include wet sandblasting and dry sandblasting. In this case, when performing the surface treatment on the first region 3, the surface treatment can be performed on the first region 3 while a mask is provided in areas other than the first region 3. Therefore, in this embodiment, the surface treatment can be performed on the first region 3 while a mask is provided in the second region 4. In addition, as the mask, a plate-shaped mask such as a SUS plate or a plastic plate, or a resist film, an adhesive film, a coating agent, etc. can be used.

[0072] Wet sandblasting is a process in which abrasive particles composed of solid particles such as aluminum oxide and a liquid such as water are uniformly mixed to form a slurry, and compressed air is sprayed from a nozzle at high speed onto a workpiece composed of an original cover member, thereby forming fine irregularities on the workpiece.

[0073] In wet sandblasting, when the high-speed sprayed slurry collides with the workpiece, the abrasive particles in the slurry cut, hit or scrape the surface of the workpiece, thereby forming fine concave and convex surfaces on the workpiece.

[0074] In this case, the abrasive grains ejected onto the workpiece or the fragments of the workpiece cut by the abrasive grains are washed away by the liquid ejected onto the workpiece, so that the particles remaining on the workpiece are reduced.

[0075] Furthermore, in wet blasting, when a slurry is sprayed onto a workpiece, the liquid carries the abrasive grains onto the workpiece. This makes it easier to use finer abrasive grains than in dry blasting, and the impact of the abrasive grains on the workpiece is reduced, enabling precise machining. Furthermore, wet blasting is characterized by the tendency to create uneven surfaces where the maximum peak height Sp1 is less than the maximum valley depth Sv.

[0076] In wet blasting, the abrasive particle size can be set to, for example, an average particle size of 0.6 μm or more and 14.7 μm or less. The nozzle scanning pitch can be set to, for example, 100 μm or more and 3000 μm or less. The number of nozzle scans (the number of times the same area is scanned) can be set to, for example, 1 or more and 5 or less. The slurry discharge pressure (processing pressure) can be set to, for example, 0.1 MPa or more and 0.4 MPa or less. Furthermore, the nozzle movement speed (processing speed) can be set to, for example, 0.1 mm / s or more and 50 mm / s or less.

[0077] In addition, by increasing the particle size of the abrasive in the wet sandblasting process, increasing the processing pressure, slowing down the movement speed of the nozzle, or increasing the number of scanning times of the nozzle, the arithmetic mean height Sa1, maximum peak height Sp1, maximum valley depth Sv1, and maximum height Sz1 of the concave and convex parts of the first area 3 of the cover part 1 can be increased.

[0078] Furthermore, the average length RSm1 of the roughness curve elements of the unevenness of the cover member 1 in the first region 3 can be reduced by reducing the particle size of the abrasive grains used in the wet blasting process, reducing the process pressure, or increasing the scanning speed of the nozzle.

[0079] Furthermore, as described above, the second region 4 may not be subjected to any surface treatment at all, or may be subjected to a surface treatment different from that of the first region 3. Examples of surface treatments different from those of the first region 3 include wet sandblasting under conditions different from those of the first region 3, coating with a component containing SiO2, coating with a component containing fluorine, or HF etching. Furthermore, the surface 2 of the cover member 1 may, of course, have one or more regions subjected to a surface treatment different from that of both the first region 3 and the second region 4.

[0080] The surface 2 of the cover member 1 and / or the surface opposite to the surface 2 may be provided with an antireflection film, an antifouling film, a decorative film, or a decorative coating.

[0081] As the antireflection film, for example, a dielectric multilayer film in which a low-refractive-index film having a relatively low refractive index and a high-refractive-index film having a relatively high refractive index are alternately stacked can be used. The antireflection film can be formed by sputtering, CVD, or the like.

[0082] When the surface 2 of the cover member 1 has an antireflection film, the surface irregularities of the antireflection film are formed to correspond to the irregularities of the first region 3 and the second region 4 .

[0083] Antifouling films are films that prevent fingerprints from sticking and impart water and oil repellency. They preferably contain a fluoropolymer containing silicon in its backbone. Examples of fluoropolymers include those containing -Si-O-Si- units in their backbone and fluorinated hydrophobic functional groups in their side chains. Fluoropolymers can be synthesized, for example, by dehydration condensation of silanol.

[0084] Examples of decorative films or coatings include resins such as polymethyl methacrylate (PMMA), polyvinyl alcohol (PVA), polypropylene (PP), polyethylene terephthalate (PET), acrylic, polyurethane, and fluorine-based resins, metal foils, and laminates thereof. Even when a decorative film or coating is applied to the cover member 1, the concave and convex areas provided in the first and second regions 3 and 4 can impart a tactile feel without impairing the visibility of the decorative film's pattern.

[0085] (Deformation example of concave and convex) When the first region 3 has the above-mentioned concavity and convexity as the first concavity and convexity, the first region 3 may further have a second concavity and convexity that is larger than the average length RSm of the roughness curve element of the first concavity and convexity. More specifically, as Figure 2 As shown, the measured profile curve of the unevenness of the first region 3 may include first unevenness as fine unevenness and second unevenness as large unevenness. In this case, the operation portion displayed on the display 10 can be more easily recognized by tactile sensation.

[0086] First variant; In the first variant, the maximum height Rz2 of the second concave-convex is preferably greater than 1 nm, more preferably greater than 2 nm, further preferably greater than 50 nm, preferably less than 500 nm, more preferably less than 450 nm, further preferably less than 400 nm, further more preferably less than 300 nm, further more preferably less than 200 nm, further more preferably less than 100 nm, and particularly preferably less than 50 nm.

[0087] The average length RSm2 of the roughness curve elements of the second concavoconvexity is preferably 100 μm or more, more preferably 200 μm or more, further preferably 250 nm or more, and is preferably 2000 μm or less, more preferably 1500 μm or less.

[0088] "Maximum height Rz2" and "average length RSm2 of the roughness curve elements" are the values ​​obtained when the cutoff value of the high-pass filter λc, used to cut off long-wavelength components from the profile curve representing the cross-sectional shape of the unevenness of the first region 3, is set to four times the average length RSm2 of the roughness curve elements of the second unevenness, and the cutoff value of the low-pass filter λs, used to cut off short-wavelength components from the profile curve representing the cross-sectional shape of the unevenness of the first region 3, is set to 27 μm. The cutoff value of the high-pass filter λc for the second unevenness can be obtained by multiplying the value of the provisional average length RSm of the roughness curve elements obtained by predicting the timing without a filter by four. Hereinafter, this measurement condition will sometimes be referred to as Condition B.

[0089] The "maximum height Rz2" and the "average length RSm2 of the roughness curve elements" can be measured in accordance with JIS B0601:2001 in the same manner as the average length RSm1 of the roughness curve elements of the first concavity and convexity. Figure 2 The average of the period lengths Xs of the concavities and convexities of the predetermined reference length shown.

[0090] In the first modification, by setting the maximum height Rz2 of the second concavo-convex and the average length RSm2 of the roughness curve element within the above ranges, the visibility of the image displayed on the display 10 can be maintained and the operation portion displayed on the display 10 can be more easily recognized by touch.

[0091] The second concavo-convex portion of the first modified example can be formed, for example, by increasing the scanning pitch of a circular nozzle, such as a circular nozzle, during the wet sandblasting process used to form the aforementioned concavo-convex portion (the first concavo-convex portion). This allows for the formation of an area where the nozzle's machining marks do not interfere, allowing for the formation of not only the minute first concavo-convex portion but also the formation of the second concavo-convex portion, which is larger and spaced at the same interval as the nozzle's scanning pitch.

[0092] When forming both the first and second concavoconvex shapes, the nozzle scanning pitch can be set to, for example, 0.25 mm to 3 mm. On the other hand, when forming only the first concavoconvex shape, the nozzle scanning pitch can be set to, for example, 0.05 mm to less than 0.25 mm.

[0093] Furthermore, the maximum height Rz2 of the second concavoconvexity can be increased by increasing the blast pressure of the nozzle during the wet blasting process or increasing the particle size.

[0094] Furthermore, by increasing the scanning pitch of the nozzle in the wet blasting process, the average length RSm2 of the roughness curve elements can be increased.

[0095] Second variant; In the second variant, the first region 3 has the following first concave-convex, which, when measured under the following condition A2, has an arithmetic mean height Sa3 of greater than 0.5 nm and less than 200 nm, an average length RSm3 of the roughness curve element of greater than 0.1 μm and less than 5 μm, and satisfies the maximum peak height Sp3 < maximum valley depth Sv3.

[0096] Condition A2 is a condition in which the cutoff value of the high-pass filter λc for cutting off long-wavelength components from the contour curve representing the cross-sectional shape of the concavities and convexities of the first region 3 is set to 2.5 μm.

[0097] In the second variant, condition A2 is used instead of condition A to measure the "arithmetic mean height Sa3", "average length RSm3 of roughness curve element", "maximum peak height Sp3", "maximum valley depth Sv3", "maximum height Sz3", "kurtosis Sku3", and "skewness Ssk3".

[0098] Furthermore, the values ​​for "arithmetic mean height Sa3," "average length of roughness curve elements RSm3," "maximum peak height Sp3," "maximum valley depth Sv3," "maximum height Sz3," "kurtosis Sku3," and "skewness Ssk3" can be the same as the preferred ranges for "arithmetic mean height Sa1," "average length of roughness curve elements RSm1," "maximum peak height Sp1," "maximum valley depth Sv1," "maximum height Sz1," "kurtosis Sku1," and "skewness Ssk1" under the aforementioned condition A. In this case, the same values ​​can be used for both the first region 3 and the second region 4.

[0099] In the second modification, the first region 3 has second concavities and convexities whose maximum height Sz4 is 20 nm to 500 nm inclusive and whose average length RSm4 of roughness curve elements is 3 μm to 30 μm inclusive when measured under the following condition C.

[0100] Under condition C, the "maximum height Sz4" and the "average length RSm4 of the roughness curve element" are conditions for setting the cutoff value of the high-pass filter λc for cutting off the long wavelength component from the contour curve representing the cross-sectional shape of the concave and convex of the first region 3 to 14 μm, and setting the cutoff value of the low-pass filter λs for cutting off the short wavelength component from the contour curve representing the cross-sectional shape of the concave and convex of the first region 3 to 0.35 μm.

[0101] The “maximum height Sz4” can be measured in accordance with ISO 25178, similarly to the arithmetic mean height Sa1 and the maximum height Sz1 of the first concavoconvexities.

[0102] The "average length RSm4 of the roughness curve elements" can be measured in accordance with JIS B0601:2001 in the same manner as the average length RSm1 of the roughness curve elements of the first concavity and convexity. Figure 2 The average of the period lengths Xs of the concavities and convexities of the predetermined reference length shown.

[0103] The maximum height Sz4 of the second concavoconvexity is preferably 25 nm or more, more preferably 25 nm or more, further preferably 40 nm or more, and is preferably 400 nm or less, more preferably 380 nm or less.

[0104] Furthermore, the average length RSm4 of the roughness curve elements of the second concavoconvexity is 3 μm or more, preferably 4 μm or more, and 30 μm or less, preferably 25 μm or less, and more preferably 20 μm or less.

[0105] In the second modification, by setting the surface roughness of the first and second concavo-convex portions within the above range, the visibility of the image displayed on the display 10 can be maintained, and the operation portion displayed on the display 10 can be more easily recognized by touch.

[0106] The first and second concave-convex portions in the second variant can be formed, for example, by the following method, which includes: a first process of forming pre-concave-convex portions of the second concave-convex portions as large concave-convex portions by performing wet sandblasting or dry sandblasting on the portion becoming the first region 3; a second process of forming second concave-convex portions in the portion where the pre-concave-convex portions are provided by performing chemical etching on the portion becoming the first region 3; and a third process of forming tiny first concave-convex portions by further performing wet sandblasting on the portion becoming the first region 3.

[0107] In the wet blasting process of the first step, the abrasive particle size can be set to, for example, an average particle size of 0.6 μm to 11.9 μm. The nozzle scanning pitch can be set to, for example, 100 μm to 500 μm. The number of nozzle scans can be set to, for example, 1 to 5. The slurry discharge pressure (processing pressure) can be set to, for example, 0.1 MPa to 0.4 MPa. Furthermore, the nozzle movement speed (processing speed) can be set to, for example, 1 mm / s to 50 mm / s.

[0108] The chemical etching process in the second step can be performed by, for example, immersing the original cover member in hydrofluoric acid or a solution containing hydrofluoric acid and another acid. Other acids that can be used include sulfuric acid, nitric acid, and hydrochloric acid. In addition, a chelating agent such as citric acid can also be used.

[0109] The content of hydrofluoric acid in the etching solution can be, for example, 1% by mass or more and 10% by mass or less. The content of sulfuric acid in the etching solution can be, for example, 20% by mass or more and 60% by mass or less. Furthermore, the content of water in the etching solution can be, for example, 30% by mass or more and 98% by mass or less.

[0110] The temperature of the etching solution can be set to, for example, 5° C. to 80° C., or 100° C. or less under closed pressure. The immersion time in the etching solution can be set to, for example, 60 seconds to 60 minutes.

[0111] Alternatively, the etching process may be performed using hydrogen fluoride (HF) gas.

[0112] In the wet blasting process of the third step, the abrasive particle size can be set to, for example, an average particle size of 0.6 μm to 4 μm. The nozzle scanning pitch can be set to, for example, 100 μm to 500 μm. The number of nozzle scans can be set to, for example, 1 to 5. The slurry discharge pressure (processing pressure) can be set to, for example, 0.1 MPa to 0.4 MPa. Furthermore, the nozzle movement speed (processing speed) can be set to, for example, 1 mm / s to 50 mm / s.

[0113] In addition, in the second modification, by increasing the particle size of the abrasive in the wet blasting process of the first step, increasing the process pressure, or slowing down the movement speed of the nozzle (processing speed), the maximum height Sz4 of the second concavoconvexity and the average length RSm4 of the roughness curve element can be increased.

[0114] Furthermore, by increasing the concentration of sulfuric acid in the chemical etching process of the second step, the maximum height Sz4 of the second concavity and convexity can be suppressed. On the other hand, by extending the immersion time in the etching solution, the maximum height Sz4 of the second concavity and convexity and the average length RSm4 of the roughness curve elements can be increased.

[0115] In addition, by increasing the particle size of the abrasive in the wet sandblasting process of the third step, increasing the processing pressure, or slowing down the movement speed of the nozzle (processing speed), the arithmetic mean height Sa3 of the first concave-convex, the average length RSm3 of the roughness curve element, the maximum peak height Sp3, the maximum valley depth Sv3, and the maximum height Sz3 can be increased.

[0116] [Second embodiment] Figure 3 1 is a schematic front view of a cover member according to a second embodiment of the present invention.

[0117] like Figure 3As shown, on the surface 22 of the cover member 21, the first region 23 is an area other than the area where buttons serving as the operating portion are displayed on the display 20. Similar to the first region 3 of the first embodiment, the first region 23 is a surface-treated region having surface treatment and having irregularities on the surface.

[0118] The second region 24 is a region where buttons serving as an operation portion are displayed on the display 20. However, the second region 24 has a surface roughness different from that of the first region 23, similarly to the second region 4 of the first embodiment.

[0119] Thus, in the second embodiment, the first region 23 other than the region displaying the operation unit is subjected to surface treatment, and the second region 24 displaying the operation unit has a surface roughness different from that of the first region 23. Furthermore, a boundary 25 is defined between the first region 23 and the second region 24. Other points are the same as those of the first embodiment.

[0120] In the cover member 21 of the second embodiment, the first region 23 also has the above-described unevenness, and thus the visibility of the image displayed on the display can be improved.

[0121] Furthermore, in the cover member 21, the second region 24 displaying the operating portion is not subjected to the same surface treatment as the first region 23. Therefore, the second region 24 has different concavities and convexities than the first region 23. Therefore, tactile information about the operating portion can be easily obtained at the boundary 25 between the first region 23 and the second region 24. Consequently, even in the cover member 21, the operating portion displayed on the display 20 can be easily recognized by touch.

[0122] [Third embodiment] Figure 4 It is a schematic perspective view showing a cover member according to a third embodiment of the present invention.

[0123] like Figure 4 As shown, cover member 31 is provided on the front of a notebook computer or tablet computer with a full-screen display. A first region 33 of surface 32 of cover member 31 is the area where the keyboard, serving as the operating unit, is displayed on display 30. Similar to first region 3 of the first embodiment, first region 33 is a surface-treated region with irregularities on its surface.

[0124] Furthermore, the second region 34 is an area outside the area where the keyboard portion, serving as the operating unit, is displayed on the display 30. Like the second region 4 of the first embodiment, the second region 34 has a surface roughness different from that of the first region 33. Furthermore, a boundary 35 is defined between the first region 33 and the second region 34. Other aspects are the same as those of the first embodiment.

[0125] In the cover member 31 of the third embodiment, the specific first region 33 and second region 34 are also formed on the surface 32 . Therefore, the image displayed on the display 30 has excellent visibility and the operation portion displayed on the display 30 can be easily recognized by touch.

[0126] The display cover member of the present invention is suitable for use with touch-panel displays. It is particularly well-suited for applications such as in-vehicle displays and displays displaying buttons or keyboards, where it is desirable to sense the position of operating components by touch rather than by sight. Furthermore, the display cover member can be incorporated into a personal computer, tablet computer, or household appliance, and can also be used as a cover to protect the display of such devices.

[0127] In the first and third embodiments, the area where the operation unit is displayed on the display 10 or 30 is composed of the first area 3 or 33 as the surface-treated area. In the second embodiment, the area where the operation unit is displayed on the display 20 is composed of the second area 24 having a surface roughness different from that of the first area 23 as the surface-treated area. In particular, in the present invention, the area where the operation unit is displayed on the display may have a surface roughness such as Figure 5 The pattern 41 is shown.

[0128] Specifically, the area where the display displays the operation unit may include a pattern 41 in which a plurality of first areas 43 are arranged at intervals in a predetermined direction (hereinafter referred to as the X direction). Figure 5 and the following Figure 6 In the embodiments described in (a) and (b), the shaded area is the first area 43, and the remaining area (the area between the plurality of first areas 43 or the area outside the display area where the operating unit is displayed) is the second area 44. In this case, any of the first area 43, the second area 44, and the area outside the display area where the operating unit is displayed can serve as the second area 44. Alternatively, other areas having a different surface roughness than the first and second areas 43, 44 can be provided. Furthermore, the spacing between adjacent first areas 43 is preferably equal.

[0129] In pattern 41, first region 43 is a surface-treated region that has been subjected to the same surface treatment as first region 3 of the first embodiment. Furthermore, second region 44 has a surface roughness different from that of first region 43 and has the same surface roughness as second region 4 of the first embodiment. Furthermore, a boundary 45 is defined between first region 43 and second region 44.

[0130] In pattern 41, first region 43 and second region 44 have different surface roughnesses, so their boundaries 45 serve as friction change points. Therefore, by spacing first regions 43 in the X direction, as in pattern 41, multiple friction change points are created. This improves the tactile feel when, for example, a finger (hereinafter referred to as a finger) is slid in the X direction.

[0131] In this way, when sliding a finger in a specific direction within pattern 41, the tactile sensation can be enhanced. Therefore, for example, the present invention is suitable for use in an operating unit of a touch-panel display that includes the action of sliding a finger in a specific direction. Examples of such an operating unit include operating units for adjusting the volume, the temperature, or the air volume of an air conditioner, etc., in displays for vehicles, music devices, or home appliances. In such an operating unit, for example, when sliding a finger along pattern 41 to increase or decrease the volume, or the temperature or air volume of an air conditioner, the tactile sensation can be enhanced. Therefore, in such an operating unit, when increasing or decreasing the volume, or the temperature or air volume of an air conditioner, the action can be performed by relying on touch, not vision.

[0132] Furthermore, in this embodiment, pattern 41 is configured to allow a finger to slide up and down within the operating portion. For example, pattern 41 can be configured to allow a finger to slide in a circular motion. The direction of finger sliding is not particularly limited. In pattern 41, for example, first regions 43 can be spaced apart and arranged along the direction of finger sliding.

[0133] The shape of the pattern 41 is not particularly limited and can be appropriately determined according to the shape of the target operation portion. Figure 5 or, Figure 6 In the case of patterns such as (a) and (b), the vertical direction can be recognized by tactile sense even when the volume is increased or decreased or the temperature or air volume of the air conditioner is increased or decreased.

[0134] In addition, the number of first regions 43 arranged at intervals in the pattern 41 can be appropriately determined according to the shape of the target operation portion. The number of first regions 43 arranged at intervals is preferably 2 or more and preferably 100 or less.

[0135] As an example of the pattern 41, there are Figure 5 In the shape shown in FIG. 1 , the number of the first regions 43 is set to 11. Alternatively, for example, Figure 6 Like (a) or (b), it is in the shape of an arrow.

[0136] The pattern 41 can be formed, similarly to the first embodiment, by performing surface treatment on the region to be the first region 43 while providing a mask on the region to be the second region 44. Therefore, the same manufacturing method as in the first embodiment can be used to form the pattern 41.

[0137] Furthermore, when forming another region having a surface roughness different from that of the first region 43 and the second region 44 , for example, it is possible to form the region by performing surface treatment on the region while providing a mask on the region other than the region.

[0138] Furthermore, in the pattern 41 , the first region 43 and the second region 44 have the same concavo-convex shape as the first region 3 and the second region 4 in the first embodiment. Therefore, even when the pattern 41 is formed in the operation portion, the visibility of the image displayed on the display can be improved.

[0139] The present invention will be described in further detail below based on specific examples. The present invention is not limited to the following examples and can be implemented with appropriate modifications without changing the gist of the present invention.

[0140] (Examples 1 to 7) First, a 1.1mm thick alkali-aluminosilicate glass plate was prepared as the cover material. Assuming that an operating unit would be displayed on a portion of one surface of the prepared glass plate, a surface treatment was applied to the first area displaying the operating unit. The first area was a rectangular 11mm x 15mm rectangle, formed into two rectangles with a 4mm gap between their long sides. Therefore, the 4mm gap between the two rectangles constituted the second area, which was not surface treated. Furthermore, the surface treatment of the first area was performed using a 2mm thick plastic mask with two 11mm x 15mm through-holes, covering the second area.

[0141] Then, the surface of the prepared glass plate provided with the first area is subjected to wet sandblasting, thereby forming projections and depressions in the first area to obtain a cover part. The wet sandblasting is performed by using a slurry prepared by uniformly stirring 3 wt% of abrasive grains composed of polygonal alumina with a particle size of ♯4000 to ♯8000 and 97 wt% of water, and spraying the slurry from the circular nozzle while moving and scanning at a speed of 0.5 mm / s to 30.0 mm / s on the processing table on which the glass plate is placed using air with a processing pressure of 0.18 MPa to 0.22 MPa. In addition, the circular nozzle is a nozzle that reduces the cross-sectional area of ​​the slurry ejection port relative to the area of ​​the surface of the glass plate and locally sprays the slurry on the surface of the glass plate. The scanning pitch of the circular nozzle is set to 0.35 mm. The conditions for the wet sandblasting in Examples 1 to 7 are shown in Table 1 below.

[0142] [Table 1] (Examples 8 to 16) A glass plate provided with a mask is prepared in the same manner as in Example 1, and wet sandblasting is performed on the surface of the prepared glass plate provided with the first region, thereby forming a first concavo-convex and a second concavo-convex region in the first region to obtain a cover component. The wet sandblasting is performed by uniformly stirring 3 wt% of abrasive grains composed of polygonal alumina with a particle size of ♯4000 to ♯8000 and 97 wt% of water to prepare a slurry, and the slurry is sprayed from a circular nozzle while scanning the processing table on which the glass plate is placed using air at a processing pressure of 0.22 MPa while moving the circular nozzle at a speed of 0.5 mm / s to 20.0 mm / s. In addition, the circular nozzle is a nozzle that reduces the cross-sectional area of ​​the slurry ejection port relative to the area of ​​the surface of the glass plate, and locally sprays the slurry onto the surface of the glass plate. The scanning pitch of the circular nozzle is set to 0.50 mm to 1.00 mm. The conditions for the wet sandblasting in Examples 8 to 16 are shown in Table 2 below.

[0143] [Table 2] (Examples 17 to 20) A glass plate provided with a mask was prepared in the same manner as in Example 1. The surface of the prepared glass plate provided with the first region was subjected to surface treatment through the following first to third steps, thereby forming first and second concavo-convex portions in the first region to obtain a cover member.

[0144] In the first step, 3 wt% of abrasive grains consisting of aluminum oxide with a particle size of ♯800 to ♯4000 and 97 wt% of water are uniformly stirred to prepare a slurry. The processing table on which a glass plate is placed is scanned while moving the nozzle at a processing speed of 5.0 mm / s to 10.0 mm / s. Using air with a processing pressure of 0.15 MPa, wet sandblasting is performed by spraying the prepared slurry from the nozzle to form a large pre-convex and concave surface.

[0145] In the second process, the glass plate with pre-recessed large recesses and projections formed by the above-mentioned first process is immersed in an etching solution containing 2wt% to 5wt% of hydrofluoric acid, 0wt% to 50wt% of sulfuric acid and 48wt% to 95wt% of pure water, and is left at a liquid temperature of 30°C for 5 minutes to 30 minutes for chemical etching treatment, thereby forming a second recess and projection as a large recess and projection from the pre-recessed recess and projection.

[0146] In the third step, 3 wt% abrasive particles composed of aluminum oxide with a particle size of ♯4000 to ♯8000 and 97 wt% water were uniformly mixed to prepare a slurry. The slurry was then wet-blasted from the nozzle using air at a processing pressure of 0.2 MPa to 0.4 MPa while scanning the nozzle at a processing speed of 5.0 mm / s to 10.0 mm / s over a processing table on which a glass plate was placed. This formed the first micro-concave-convex surface. The nozzle scanning pitch was set to 0.35 mm. The conditions for the first through third steps in Examples 17 to 20 are shown in Table 3 below.

[0147] [Table 3] (Comparative Example 1) The 1.1 mm thick alkali-containing aluminosilicate glass plate obtained by overflow molding was used as a cover member as it is. Therefore, the glass plate of Comparative Example 1 was not subjected to surface treatment.

[0148] (Comparative Example 2) A glass plate with a mask was prepared in the same manner as in Example 1. The prepared glass plate was immersed in a 5 mol % hydrofluoric acid solution for 1000 seconds to form irregularities in the first region to obtain a cover member.

[0149] (Comparative Example 3) The same operation as in Example 1 is performed to prepare a glass plate provided with a mask, and a liquid containing SiO2 components is sprayed on the surface of the prepared glass plate provided with the first area to perform coating, and the coated liquid containing SiO2 components is dried to form a silica coating film on the first area of ​​the glass plate to obtain a cover part.

[0150] (Comparative Example 4) A cover member was obtained in the same manner as in Example 19 except that the surface treatment in the third step was not performed and only the large concavities and convexities (second concavities and convexities) were formed.

[0151] (Comparative Example 5) A cover member was obtained in the same manner as in Example 20 except that the surface treatment in the third step was not performed and only the large irregularities (second irregularities) were formed.

[0152] [Evaluation Method] (Evaluation of surface roughness) The surface roughness of the first region of the cover members obtained in Examples 1 to 20 and Comparative Examples 2 to 5 was measured. In addition, the surface roughness of one surface of the cover member of Comparative Example 1 was measured.

[0153] Regarding the unevenness (first unevenness) of Examples 1 to 16 and Comparative Examples 1 to 5, the arithmetic mean height Sa1, maximum height Sz1, maximum peak height Sp1, maximum valley depth Sv1, average length RSm1 of the roughness curve elements, kurtosis Sku1, and skewness Ssk1 ​​were measured using a white interference microscope (manufactured by Zygo Corporation, "New View 7300") as the surface roughness parameters to be measured.

[0154] Regarding the irregularities (first irregularities) of Examples 17 to 20, as parameters of the surface roughness to be measured, the arithmetic mean height Sa3, maximum height Sz3, maximum peak height Sp3, maximum valley depth Sv3, mean length RSm3 of the roughness curve elements, kurtosis Sku3, and skewness Ssk3 were measured using an atomic force microscope (AFM, manufactured by Bruker, "Dimension Icon (SPM unit)" and "NanoScope V (Controller unit)").

[0155] In addition, regarding the second concavities and convexities of Examples 8 to 20, as parameters of the surface roughness to be measured, the maximum height Rz2 or the maximum height Sz4, and the average lengths RSm2 and RSm4 of the roughness curve elements were measured using a white light interference microscope (Zygo Corporation, "New View 7300").

[0156] In all measurements, the average length RSm of the roughness curve element was measured in accordance with JIS B0601: 2001. Other surface roughness parameters were measured in accordance with ISO 25178.

[0157] <Condition A> Evaluation was performed under Condition A on the unevenness (first unevenness) of Examples 1 to 16 and the unevenness of Comparative Examples 1 to 5.

[0158] Evaluation under condition A was performed using a 50x objective lens, a 2x zoom lens, a measurement area of ​​74 μm×55 μm, a camera pixel count of 640×480, and 10 accumulation times.

[0159] In addition, under condition A, when measuring the arithmetic mean height Sa1, maximum height Sz1, maximum peak height Sp1, maximum valley depth Sv1, average length RSm1 of the roughness curve element, kurtosis Sku1, and skewness Ssk1, the cutoff value of the high-pass filter λc is set to 14μm, and the cutoff value of the low-pass filter λs is set to 0.35μm.

[0160] <Condition A2> The unevenness (first unevenness) of Examples 17 to 20 was evaluated according to Condition A2.

[0161] Evaluation according to condition A2 was performed using a tapping mode with a measurement area of ​​5 μm×5 μm at a scanning rate of 1 Hz and a number of acquired data of 512×512.

[0162] Based on the acquired data, the above-mentioned surface roughness parameters were measured within a square region with a side of 5 μm. The analysis was performed with the cutoff value of the high-pass filter λc set to 2.5 μm.

[0163] Condition B The second concavities and convexities of Examples 8 to 16 were evaluated according to Condition B.

[0164] Evaluation under condition B was performed using a 2.5x objective lens and a 0.5x zoom lens, with a measurement area of ​​5658 μm×4243 μm, a camera pixel count of 640×480, and a cumulative count of 1.

[0165] Furthermore, under Condition B, when measuring the height (maximum height Rz2) and the spacing between the second asperities (average length RSm2 of the roughness curve elements), the cutoff value of the high-pass filter λc was set to approximately four times the spacing width RSm2 of the second asperities, and the cutoff value of the low-pass filter λs was set to 27 μm. The cutoff value of the high-pass filter λc for the second asperities was calculated by multiplying the provisional average length RSm of the roughness curve elements obtained by predicting timing without a filter by four.

[0166] Condition C The second concavities and convexities of Examples 17 to 20 were evaluated according to Condition C.

[0167] Evaluation under condition C was performed using a 50x objective lens, a 2x zoom lens, a measurement area of ​​74 μm×55 μm, a camera pixel count of 640×480, and 10 accumulation times.

[0168] In Condition C, when measuring the height of the second concavity and convexity (maximum height Sz4) and the interval between the concavities and convexities (average length RSm4 of the roughness curve elements), the cutoff value of the high-pass filter λc was set to 14 μm, and the cutoff value of the low-pass filter λs was set to 0.35 μm.

[0169] (Evaluation of haze) The haze of the cover members of Examples 1 to 20 and Comparative Examples 1 to 5 was evaluated. The haze was evaluated on the first region. In Comparative Example 1, the haze was evaluated on one surface of the cover member. The haze was evaluated within the wavelength range of 380 nm to 780 nm. Haze was measured using an ultraviolet-visible-near-infrared spectrophotometer (manufactured by Shimadzu Corporation, Model UV-3100PC) in accordance with JIS K7361-1-1997.

[0170] (Evaluation of Sparkling (Glare)) Flash point (glare) evaluation was performed on the cover members of Examples 1 to 20 and Comparative Examples 1 to 5. The flash point (glare) evaluation was performed on the first region. In Comparative Example 1, the evaluation was performed on one surface of the cover member.

[0171] Evaluation of Sparkle (Glare) The cover members of Examples 1 to 20 and Comparative Examples 1 to 5 were placed on an 11-inch iPad (registered trademark) pro manufactured by Apple Inc., and the presence or absence of sparkle (glare) when an image was displayed on the iPad (registered trademark) pro was visually checked.

[0172] (Image visibility (when the display is lit) evaluation) The visibility of images other than the buttons serving as the operating portion was evaluated for the cover members of Examples 1 to 20 and Comparative Examples 1 to 5. Image visibility was evaluated for the first region. Furthermore, in Comparative Example 1, the visibility was evaluated for one surface of the cover member.

[0173] Image visibility was evaluated by placing the cover members of Examples 1 to 20 and Comparative Examples 1 to 5 on an 11-inch iPad (registered trademark) pro manufactured by Apple. When an image different from the button image was displayed on the iPad (registered trademark) pro, the following four-level evaluation criteria were used to evaluate whether the button portion (first area) displaying the button image obstructed the visibility of the other image.

[0174] <Evaluation Criteria> ○○: Visibility is barely affected (although the button area appears slightly whitish, the displayed image is not blurry, etc.) ○: Slightly impairs visibility (although the button area appears slightly whitish, there is no blurring of the displayed image) △: Somewhat impaired visibility (although the button area appears whitish and the color of other images is noticeably affected, the displayed image is not blurry) ×: Visibility is impaired (the button area appears whitish, and the displayed image is blurred) (Evaluation of the touch feel of the button area) The tactile feel of the button portion (first region) displaying the button image was evaluated for the cover members of Examples 1 to 20 and Comparative Examples 1 to 5. In Comparative Example 1, the evaluation was performed on one surface of the cover member.

[0175] To evaluate the tactile feel of the button area, the cover members of Examples 1-20 and Comparative Examples 1-5 were placed on an 11-inch iPad (registered trademark) Pro manufactured by Apple. In this state, an image of a button of the same size and position as the button area was displayed on the iPad (registered trademark) Pro. When the button area was pressed or touched, the tactile sense of the button area was evaluated using a seven-point scale: "7" (the button area was recognizable) to "1" (the button area was not recognizable at all). A higher number indicates greater ease of button recognition.

[0176] [Evaluation results] The evaluation results are shown in Tables 4 to 7 below.

[0177] [Table 4] [Table 5] [Table 6] [Table 7] (Surface roughness measurement results) As shown in Tables 4 and 6, in Examples 1 to 16, the arithmetic mean height Sa1 of the concave-convex (first concave-convex) in the first region is in the range of 0.7 nm to 27.7 nm, the maximum height Sz1 is in the range of 32.9 nm to 654.1 nm, the maximum peak height Sp1 is in the range of 14.9 nm to 249.3 nm, the maximum valley depth Sv1 is in the range of 17.6 nm to 451.6 nm, the average length RSm1 of the roughness curve element is in the range of 2.0 μm to 4.2 μm, the kurtosis Sku1 is in the range of 3.6 to 20.4, and the skewness Ssk1 ​​is in the range of -1.6 to -0.1.

[0178] In contrast, as shown in Table 5, in Comparative Examples 1 to 5, for the untreated Comparative Example 1, the arithmetic mean height Sa1 of the surface unevenness is 0.1 nm, the maximum height Sz1 is 3.2 nm, the maximum peak height Sp1 is 1.8 nm, the maximum valley depth Sv1 is 1.3, the average length RSm1 of the roughness curve element is 1.0 μm, the kurtosis Sku1 is 5.2, and the skewness Ssk1 ​​is 0.3.

[0179] Regarding Comparative Example 2 in which only chemical etching was performed, the arithmetic mean height Sa1 of the concavities and convexities in the first region was 0.2 nm, the maximum height Sz1 was 4.0 nm, the maximum peak height Sp1 was 2.0 nm, the maximum valley depth Sv1 was 1.2 nm, the average length RSm1 of the roughness curve element was 2.2 μm, the kurtosis Sku1 was 3.1, and the skewness Ssk1 ​​was -0.1.

[0180] Regarding Comparative Example 3 with only a silica coating film, the arithmetic mean height Sa1 of the concave and convex parts in the first region is 47.5 nm, the maximum height Sz1 is 775.2 nm, the maximum peak height Sp1 is 538.7 nm, the maximum valley depth Sv1 is 236.5 nm, the average length RSm1 of the roughness curve element is 9.9 μm, the kurtosis Sku1 is 6.4, and the skewness Ssk is 0.9.

[0181] Regarding comparison examples 4 and 5 in which only the second concavoconvexity is given, the arithmetic mean height Sa1 of the concavoconvexity in the first region is in the range of 10.0nm to 13.6nm, the maximum height Sz1 is in the range of 82.1nm to 113.7nm, the maximum peak height Sp1 is in the range of 45.7nm to 74.4nm, the maximum valley depth Sv1 is in the range of 40.5nm to 47.5nm, the average length RSm1 of the roughness curve element is in the range of 7.0μm to 15.2μm, the kurtosis Sku1 is in the range of 2.8 to 3.3, and the skewness Ssk1 ​​is in the range of -0.5 to 0.4.

[0182] As shown in Table 7, for Examples 17 to 20, the arithmetic mean height Sa3 of the concave-convex (first concave-convex) in the first region is in the range of 7.9nm to 16.7nm, the maximum height Sz3 is in the range of 92.0nm to 155.0nm, the maximum peak height Sp3 is in the range of 28.1nm to 42.8nm, the maximum valley depth Sv3 is in the range of 62.2nm to 94.5nm, the average length RSm3 of the roughness curve element is in the range of 0.2μm to 0.4μm, the kurtosis Sku3 is in the range of 3.5 to 6.8, and the skewness Ssk3 is a value in the range of -1.7 to -0.6.

[0183] As shown in Table 6, regarding the second concavities and convexities of Examples 8 to 16, the interval between the large concavities and convexities (average length RSm2 of the roughness curve elements) is a value within the range of 500 μm to 1000 μm, and the height of the large concavities and convexities (maximum height Rz2) is within the range of 2 nm to 50 nm.

[0184] As shown in Table 7, regarding the second concavo-convexity of Examples 17 to 20, the interval between the large concavo-convexity (average length RSm4 of the roughness curve element) is a value in the range of 4.6 μm to 14.6 μm, and the height of the large concavo-convexity (maximum height Sz4) is a value in the range of 96.6 nm to 371.9 nm.

[0185] In addition, as mentioned above, the second regions of Examples 1 to 20 and Comparative Examples 4 and 5 were not surface treated, that is, untreated, and the arithmetic mean height Sa1 of the surface bumps was 0.1 nm, the maximum height Sz1 was 3.2 nm, the maximum peak height Sp1 was 1.8 nm, the maximum valley depth Sv1 was 1.3, the average length RSm1 of the roughness curve element was 1.0 μm, the kurtosis Sku1 was 5.2, and the skewness Ssk1 ​​was 0.3.

[0186] (Haze evaluation results) As shown in Tables 4, 6, and 7, the haze of Examples 1 to 20 ranged from 0.3% to 9.8%.

[0187] In contrast, as shown in Table 5, among Comparative Examples 1 to 5, the haze of untreated Comparative Example 1 was 0.1%, and that of Comparative Example 2, which was treated with only chemical etching, was 0.1%. The haze of Comparative Example 3, which had only a silica coating film, was 47.4%. The haze of Comparative Examples 4 and 5, which had only the second concavo-convex surface, was in the range of 1.0% to 1.9%.

[0188] (Evaluation results of flash point (glare)) As shown in Tables 4, 6 and 7, the flash points of Examples 1 to 20 were "none".

[0189] In contrast, as shown in Table 5, among Comparative Examples 1 to 5, the flash point of untreated Comparative Example 1 was "None." The flash point of Comparative Example 2, which was treated with chemical etching alone, was "None." The flash point of Comparative Example 3, which had only a silica coating film, was "Present." The flash point of Comparative Examples 4 and 5, which had only the second concavo-convex portion, was "None."

[0190] (Image visibility (when the display is lit) evaluation results) As shown in Tables 4, 6, and 7, the image visibility of Examples 1 to 20 is within the range of "0" to "00".

[0191] In contrast, as shown in Table 5, among Comparative Examples 1 to 5, the image visibility of Comparative Example 1, which was untreated, was "○○." The image visibility of Comparative Example 2, which was treated with chemical etching alone, was "○○." The image visibility of Comparative Example 3, which had only a silica coating film, was "×." The image visibility of Comparative Examples 4 and 5, which had only the second concavo-convex portion, was "○○."

[0192] (Evaluation results of the tactile feel of the button area) As shown in Tables 4, 6, and 7, the evaluation results of the touch feeling of the button portion of Examples 1 to 20 were values ​​within the range of "5" to "7".

[0193] In contrast, as shown in Table 5, among Comparative Examples 1 to 5, the evaluation result for the tactile feel of the button portion of untreated Comparative Example 1 was "1." The evaluation result for the tactile feel of the button portion of Comparative Example 2, which was subjected to only chemical etching, was "2." The evaluation result for the tactile feel of the button portion of Comparative Example 3, which had only the silica coating film, was "4." The evaluation result for the tactile feel of the button portion of Comparative Examples 4 and 5, which had only the second concavo-convex surface, was "3."

[0194] (Comprehensive evaluation) As can be seen from the above results, as shown in Tables 4 to 7, regarding Examples 1 to 20, by forming appropriate fine concavo-convex patterns (first concavo-convex patterns), or a combination of fine concavo-convex patterns (first concavo-convex patterns) and large concavo-convex patterns (second concavo-convex patterns) in the button area (first area), the difference in friction coefficient between the unprocessed area and the processed area is increased, and good results are achieved in terms of tactile perception of the button (evaluation results of the tactile feel of the button area) and image visibility.

[0195] Furthermore, by keeping the haze low, it is possible to suppress the reduction in image visibility caused by the button area (first region) when the display is lit. In addition, by setting the size of the concave and convex shapes to an appropriate range, it is also possible to suppress the occurrence of flash points.

[0196] On the other hand, in the untreated Comparative Example 1, since the unevenness of the button portion (first region) was small, although the image visibility and sparkle point were good, the evaluation results of the perception of the button presence (evaluation results of the tactile feel of the button portion) were poor.

[0197] In Comparative Example 2, which was subjected to only chemical etching, the unevenness formed in the button portion (first region) was small. Therefore, although image visibility and flash point were good, the evaluation results regarding the perception of the button presence (evaluation results of the tactile feel of the button portion) were poor.

[0198] Comparative Example 3, which only had a silica coating film, had poor evaluation results for image visibility and flash point due to the large average length of the roughness curve elements of the concave and convex portions formed in the button area (first region). Furthermore, due to the insufficient friction difference between the unprocessed and processed areas, the evaluation results for the perception of the button's presence (evaluation of the tactile feel of the button area) were lower than those of the examples.

[0199] In Comparative Examples 4 and 5, which only had large irregularities (second irregularities), the arithmetic mean height of the irregularities formed in the button area (first region) was within an appropriate range, resulting in favorable evaluation results for image visibility and flash point. However, due to the large average length of the roughness curve elements, the friction difference between the button area (first region) and the non-button area (second region) was insufficient, resulting in evaluation results for the perception of the button's presence (evaluation results for the tactile feel of the button area) that were lower than those of the Examples.

[0200] (Examples 21 to 25) As Example 21, a cover member was produced in the same manner as in Example 5, except that the second region was wet-blasted under the same conditions as the first region in Example 1, as shown in Table 8. Examples 22 to 25 were also treated as shown in Table 8 to produce cover members. These samples were evaluated for tactile feel of the button area using the method described above. The results are shown in Table 8 below.

[0201] [Table 8] (Evaluation results of the tactile feel of the button area) As shown in Table 8, the evaluation results of the touch feeling of the button portion of Examples 21 to 25 were "5" or "6".

[0202] Thus, even when both the first and second areas are processed, there is a friction difference due to the different surface roughness of the first and second areas, and the evaluation results of the perception of the existence of the button (the evaluation results of the tactile feel of the button area) are good.

[0203] (Example 26) The surface of the prepared glass plate provided with the first region was subjected to dry sandblasting to form irregularities in the first region, thereby obtaining a cover member. Furthermore, in the dry sandblasting, polygonal alumina (purity: 96% or more, average particle size D 50 : 2μm).

[0204] In Example 26, the arithmetic mean height Sa1 of the surface unevenness obtained in the first area is 11.5 nm, the maximum height Sz1 is 269.5 nm, the maximum peak height Sp1 is 123.4 nm, the maximum valley depth Sv1 is 146.1, the average length RSm1 of the roughness curve element is 4.6 μm, the kurtosis Sku1 is 4.8, and the skewness Ssk1 ​​is -0.5.

[0205] In addition, the haze of Example 26 was 3.2%, the flash point was "none", the image visibility was "○○", and the evaluation result of the touch feeling of the button part was "6".

[0206] Explanation of symbols 1, 21, 31…Display cover parts (cover parts) 2, 22, 32... surface 3, 23, 33, 43… first area 4, 24, 34, 44…Second area 5, 25, 35, 45... boundaries 10, 20, 30...display 41…Pattern

Claims

1. A cover member for a display, wherein: The surface of the cover member has: a first region which is a surface treatment region; and a second region having a surface roughness different from that of the first region, A boundary is formed between the first area and the second area, The first region has the following concave-convexity. When the cutoff value of the high-pass filter λc is set to 14 μm and the cutoff value of the low-pass filter λs is set to 0.35 μm, the arithmetic mean height Sa1 is greater than 0.5 nm and less than 200 nm, and the average length RSm1 of the roughness curve element is greater than 0.1 μm and less than 5 μm, satisfying the maximum peak height Sp1<maximum valley depth Sv1.

2. The display cover member according to claim 1, wherein: The first area is an area where the operation unit is displayed on the display. The second area is an area other than an area where the operation unit is displayed on the display.

3. The display cover member according to claim 1, wherein: The first area is an area outside the area where the operation unit is displayed on the display. The second area is an area where an operation unit is displayed on the display.

4. The display cover member according to claim 1, wherein: having a plurality of said first regions, The area on the display where the operation unit is displayed has a pattern in which the first areas are arranged at intervals in a predetermined direction.

5. The display cover member according to any one of claims 1 to 4, wherein: When the cutoff value of the high-pass filter λc is set to 14 μm and the cutoff value of the low-pass filter λs is set to 0.35 μm, the absolute value of the difference between the arithmetic mean height Sa1 of the first region and the arithmetic mean height Sa1 of the second region is greater than or equal to 0.5 nm and less than or equal to 200 nm.

6. The display cover member according to claim 5, wherein: The second region has the following concavities and convexities: when the cutoff value of the high-pass filter λc is 14 μm and the cutoff value of the low-pass filter λs is 0.35 μm, the arithmetic mean height Sa1 is 0.1 nm to 50 nm, and the average length RSm1 of the roughness curve elements is 0.1 μm to 5 μm.

7. The display cover member according to any one of claims 1 to 4, wherein: The maximum peak height Sp1 of the concavoconvexity in the first region is 5 nm or more and 400 nm or less, The maximum valley depth Sv1 in the unevenness of the first region is greater than or equal to 7 nm and less than or equal to 600 nm.

8. The display cover member according to any one of claims 1 to 4, wherein: The haze of the first region is 20% or less in a wavelength range of 380 nm to 780 nm.

9. The display cover member according to any one of claims 1 to 4, wherein: When the concavoconvexity of the first region is set as the first concavoconvexity, The first region further has second concavities and convexities having a roughness curve element average length RSm greater than that of the first concavities and convexities.

10. The display cover member according to claim 9, wherein: When the cutoff value of the high-pass filter λc is set to 4 times the average length RSm2 of the roughness curve element of the second concave-convex, and the cutoff value of the low-pass filter λs is set to 27 μm, the maximum height Rz2 of the second concave-convex is greater than 1 nm and less than 500 nm, and the average length RSm2 of the roughness curve element of the second concave-convex is greater than 100 μm and less than 2000 μm.

11. A cover member for a display, wherein: The surface of the cover member has: a first region which is a surface treatment region; and a second region having a surface roughness different from that of the first region, A boundary is formed between the first area and the second area, The first region has: The first concavoconvexity has an arithmetic mean height Sa3 of 0.5 nm to 200 nm, an average length RSm3 of a roughness curve element of 0.1 μm to 5 μm, and satisfies the conditions of maximum peak height Sp3 < maximum valley depth Sv3 when the cutoff value of the high-pass filter λc is set to 2.5 μm; and The second concavoconvexity has a maximum height Sz4 of 20 nm to 500 nm and an average length RSm4 of roughness curve elements of 3 μm to 30 μm when the cutoff value of the high-pass filter λc is set to 14 μm and the cutoff value of the low-pass filter λs is set to 0.35 μm.

12. The display cover member according to claim 11, wherein: When the cutoff value of the high-pass filter λc is set to 2.5 μm, the absolute value of the difference between the arithmetic mean height Sa3 of the first region and the arithmetic mean height Sa3 of the second region is greater than or equal to 0.5 nm and less than or equal to 200 nm.

13. A method for manufacturing a display cover member, for manufacturing the display cover member according to any one of claims 1 to 4, 11 and 12, the method comprising: a step of preparing a transparent member to serve as the cover member; and A step of forming the first region by performing sandblasting on a portion of the surface of the transparent member.

14. The method for manufacturing a display cover member according to claim 13, wherein: The sandblasting process is wet sandblasting process.

15. A display, characterized in that: A display cover member according to any one of claims 1 to 4, 11 and 12.

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