Glass plate, touch pad, and touch panel
A glass plate includes a main surface, and a microscopic asperity surface disposed on the main surface, the microscopic asperity surface forming peaks and valleys. When a reference plane is defined as a plane at a center, in a direction of height, of an interval of highest frequency in a histogram of height of shape data of a square region having 2 μm per side in the microscopic asperity surface, the number of peaks that are higher than the reference plane by 20% or more of a maximum height difference in the square region is in a range between 1 or more and 300 or less.
1. A glass plate comprising:
a main surface; and
a microscopic asperity surface disposed on the main surface, the microscopic asperity surface forming peaks and valleys, wherein
when a reference plane is defined as a plane at a center, in a direction of height, of an interval of highest frequency in a histogram of height of shape data of a square region having 2 μm per side in the microscopic asperity surface,
a number of peaks that are higher than the reference plane by 20% or more of a maximum height difference in the square region is in a range between 1 or more and 300 or less.
2. The glass plate according to claim 1 , wherein
surface roughness Ra of the microscopic asperity surface is in a range of 0.3 to 100 nm.
3. The glass plate according to claim 1 , wherein
haze measured from the microscopic asperity surface side of the glass plate is in a range between 0% or more and 2% or less.
4. A laminate comprising:
the glass plate according to claim 1 ; and
an antifouling layer at least a part of which is formed on the microscopic asperity surface.
5. The laminate according to claim 4 , further comprising:
an intermediate layer between the glass plate and the antifouling layer.
6. The laminate according to claim 5 , wherein
the intermediate layer includes at least one of an oxide layer, a nitride layer, an oxynitride layer, and a metal layer.
7. The laminate according to claim 4 , wherein
visible light reflectance of the laminate measured from the antifouling layer side is in a range of 0 to 3%.
8. A touch pad comprising:
the laminate according to claim 4 ; and
a position detector configured to detect a touch position of a finger on the laminate.
9. A touch panel comprising:
the laminate according to claim 4 ;
a position detector configured to detect a touch position of a finger on the laminate; and
an image display device configured to display an image according to a detection result obtained by the position detector.
10. A glass plate comprising:
a main surface; and
a microscopic asperity surface disposed on the main surface, the microscopic asperity surface forming peaks and valleys, wherein
summit density, obtained after removing a wavelength component of 0.05 μm or less from shape data of a square region having 2 μm per side in the microscopic asperity surface using an S-filter described in the International Standard ISO 16610-61, is in a range between 1/μm 2 or more and 170/μm 2 or less.
11. The glass plate according to claim 10 , wherein
surface roughness Ra of the microscopic asperity surface is in a range of 0.3 to 100 nm.
12. The glass plate according to claim 10 , wherein
haze measured from the microscopic asperity surface side of the glass plate is in a range between 0% or more and 2% or less.
13. A laminate comprising:
the glass plate according to claim 10 ; and
an antifouling layer at least a part of which is formed on the microscopic asperity surface.
14. The laminate according to claim 13 , further comprising:
an intermediate layer between the glass plate and the antifouling layer.
15. The laminate according to claim 14 , wherein
the intermediate layer includes at least one of an oxide layer, a nitride layer, an oxynitride layer, and a metal layer.
16. The laminate according to claim 13 , wherein
visible light reflectance of the laminate measured from the antifouling layer side is in a range of 0 to 3%.
17. A touch pad comprising:
the laminate according to claim 13 ; and
a position detector configured to detect a touch position of a finger on the laminate.
18. A touch panel comprising:
the laminate according to claim 13 ;
a position detector configured to detect a touch position of a finger on the laminate; and
an image display device configured to display an image according to a detection result obtained by the position detector.