COVER MEMBER
A cover member includes at least a chemically strengthened glass. The chemically strengthened glass has a Young's modulus of 60 GPa or higher. The chemically strengthened glass includes a first surface and a second surface facing the first surface. The chemically strengthened glass has a thickness t of 0.4 mm or less.
1 . A cover member comprising at least a chemically strengthened glass, wherein
the chemically strengthened glass has a Young's modulus of 60 GPa or higher,
the chemically strengthened glass includes a first surface and a second surface facing the first surface, and
the chemically strengthened glass has a thickness t of 0.4 mm or less.
2 . The cover member according to claim 1 , wherein
the chemically strengthened glass has a relative permittivity at a frequency of 1 MHz of 5 or higher.
3 . The cover member according to claim 2 , wherein
the chemically strengthened glass has the relative permittivity at a frequency of 1 MHz of 7 or higher.
4 . The cover member according to claim 1 , wherein
a depth DOL of a surface compressive stress layer of the chemically strengthened glass satisfies the relation of DOL/t≧0.05.
5 . The cover member according to claim 1 , wherein
a printing layer is provided on the second surface of the chemically strengthened glass, and
the printing layer has a thickness of 20 μm or less.
6 . The cover member according to claim 1 , wherein
a surface roughness Ra of the first surface of the chemically strengthened glass is 300 nm or lower.
7 . A cover member comprising at least a glass, wherein
the glass has a Young's modulus of 60 GPa or higher,
the glass includes a first surface and a second surface facing the first surface, and
the glass has a thickness t of 0.4 mm or less.
8 . The cover member according to claim 7 , wherein
the glass has a relative permittivity at a frequency of 1 MHz of 5 or higher.
9 . The cover member according to claim 8 , wherein
the glass has the relative permittivity at a frequency of 1 MHz of 7 or higher.
10 . The cover member according to claim 7 , wherein
a printing layer is provided on the second surface of the glass, and
the printing layer has a thickness of 20 μm or less.
11 . The cover member according to claim 7 , wherein
a surface roughness Ra of the first surface of the glass is 300 nm or lower.
12 . The cover member according to claim 1 , which has a minimum value of an absorption coefficient at a wavelength in a range of 380 nm to 780 nm of 0.7 mm −1 or higher.
13 . The cover member according to claim 1 , which has a minimum value of an absorbance at a wavelength in a range of 380 nm to 780 nm of 0.01 or higher.
14 . The cover member according to claim 1 , which has a minimum value of a total light reflectance at a wavelength in a range of 400 nm to 800 nm is 30% or higher in terms of a thickness of 1 mm.
15 . The cover member according to claim 1 , which is used for a capacitance sensor.
16 . The cover member according to claim 15 , which is used for a fingerprint authentication sensor.
17 . A cover glass comprising a chemically strengthened glass which has a Young's modulus of 60 GPa or higher and a thickness t of 0.4 mm or less.
18 . A cover glass comprising a glass which has a Young's modulus of 60 GPa or higher and a thickness t of 0.4 mm or less.
19 . The cover member according to claim 7 , which has a minimum value of an absorption coefficient at a wavelength in a range of 380 nm to 780 nm of 0.7 mm −1 or higher.
20 . The cover member according to claim 7 , which has a minimum value of an absorbance at a wavelength in a range of 380 nm to 780 nm of 0.01 or higher.
21 . The cover member according to claim 7 , which has a minimum value of a total light reflectance at a wavelength in a range of 400 nm to 800 nm is 30% or higher in terms of a thickness of 1 mm.
22 . The cover member according to claim 7 , which is used for a capacitance sensor.
23 . The cover member according to claim 22 , which is used for a fingerprint authentication sensor.