Display cover member and production method therefor
Provided is a display cover member that enables realization of a display having less reflection of the background and excellent anti-sparkle properties. The display cover member has a feature that: one of principal surfaces is formed of an uneven surface; a mean width of roughness profile elements (RSm) of the uneven surface defined by JIS B 0601-2013 is not less than 1 μm and not more than 30 μm; and a ratio θ/Rku between an average inclined angle (θ) of the roughness profile of the uneven surface and a kurtosis of the roughness profile (Rku) of the uneven surface defined by JIS B 0601-2013 is not less than 0.40° and not more than 1.08°.
1. A display cover member comprising:
a light-transmissive plate including a principal surface; and
a coating film that covers at least a portion of the principal surface of the light-transmissive plate; wherein
the coating film has an uneven surface, is made of silicon oxide, contains no scattering particles, and is a homogeneous film;
a mean width of roughness profile elements (RSm) of the uneven surface defined by JIS B 0601-2013 is not less than 1 μm and not more than 18 μm; and
a ratio θ/Rku between an average inclined angle (θ) of the roughness profile of the uneven surface and a kurtosis of the roughness profile (Rku) of the uneven surface defined by JIS B 0601-2013 is not less than 0.40° and not more than 1.08°.
2. The display cover member according to claim 1 , having a haze of not less than 1% and not more than 50.
3. The display cover member according to claim 1 , wherein an arithmetic mean roughness (Ra) of the uneven surface defined by JIS B 0601-2013 is not less than 0.04 μm and not more than 0.25 μm.
4. The display cover member according to claim 1 , wherein an absolute value |Rsk| of a skewness of the roughness profile (Rsk) of the uneven surface defined by JIS B 0601-2013 is 2 or less.
5. The display cover member according to claim 1 , wherein the coating film covers a whole of the principal surface of the light-transmissive plate.
6. The display cover member according to claim 1 , wherein a pencil hardness of the coating film defined by JIS K 5600-5-4-1999 is 6H or more.
7. The display cover member according to claim 1 , wherein the light-transmissive plate is formed of a glass plate.
8. The display cover member according to claim 7 , wherein the glass plate is formed of a strengthened glass plate.
9. A method for producing the display cover member according to claim 1 , the method comprising forming, by spraying on a light-transmissive plate, a coating film forming the uneven surface.
10. The method for producing the display cover member according to claim 9 , wherein
the light-transmissive plate is formed of a glass plate, and
after the coating film is formed on the glass plate, the glass plate is chemically strengthened.
11. The method for producing the display cover member according to claim 9 , wherein a strengthened glass plate is used as the light-transmissive plate.