Transparent plate, touch pad, and touch panel
A transparent plate includes a transparent substrate and an antifouling layer. A surface of the transparent substrate includes a fine projecting and recessed structure with a surface roughness of 2.0-100 nm. The antifouling layer includes fluorine, and at least a part of the antifouling layer is formed on a position of the fine projecting and recessed structure. A haze value of the transparent plate at the position of the fine projecting and recessed structure is 2% or less. A value of X defined by (S 1 −S 2 )/(S 3 −S 2 ) is 0.5 or more, where S 1 , S 2 and S 3 are F-Kα line strengths of the transparent plate at the position of the fine projecting and recessed structure, a reference glass plate that does not include fluorine, and a reference aluminosilicate glass plate that includes fluorine of 2 wt %, respectively, and S 1 , S 2 and S 3 are measured by a fluorescent X-ray measurement device.
1. A transparent plate comprising a transparent substrate and an antifouling layer,
wherein a surface of the transparent substrate includes a fine projecting and recessed structure with a surface roughness Ra of 2.0-100 nm,
wherein the antifouling layer includes fluorine, and at least a part of the antifouling layer is formed on a position of the fine projecting and recessed structure,
wherein a haze value of the transparent plate at the position of the fine projecting and recessed structure is 2% or less, and
wherein the amount of film deposition for the antifouling layer is represented by a value X wherein
X =( S 1 −S 2 )/( S 3 −S 2 )
is 0.5 or more,
where S 1 is an F-Kα line strength of the transparent plate at the position of the fine projecting and recessed structure, measured by a fluorescent X-ray measurement device from an antifouling layer side,
S 2 is an F-Kα line strength of a reference glass plate that does not include fluorine substantially, measured by the fluorescent X-ray measurement device, and
S 3 is an F-Kα line strength of a reference aluminosilicate glass plate that includes fluorine of 2 wt %, measured by the fluorescent X-ray measurement device.
2. The transparent plate according to claim 1 , further comprising:
an antireflection layer between the transparent substrate and the antifouling layer,
wherein the antireflection layer is a multilayered film obtained by alternately laminating layers having refractive indices differing from each other, or a single layered film having a refractive index, for light having a wavelength of 550 nm, that is 1.6 or less.
3. The transparent plate according to claim 1 , wherein the transparent substrate is a glass substrate.
4. A touch pad comprising:
the transparent plate according to claim 1 ; and
a position detector configured to detect a touch position of a finger on the transparent plate.
5. A touch panel comprising:
the transparent plate according to claim 1 ;
a position detector configured to detect a touch position of a finger on the transparent plate; and
an image display device configured to display an image according to a result of detection by the position detector.
6. A transparent plate comprising a transparent substrate and an antifouling layer,
wherein a surface of the transparent substrate includes a fine projecting and recessed structure with a surface roughness Ra of 2.0-100 nm,
wherein the antifouling layer includes fluorine, and at least a part of the antifouling layer is formed on a position of the fine projecting and recessed structure,
wherein a haze value (Y (%)) of the transparent plate at the position of the fine projecting and recessed structure satisfies relations of
Y≤a×X+b
and
Y≤2,
where
a=0.67 (%),
b=−0.33 (%),
X =( S 1 −S 2 )/( S 3 −S 2 ),
wherein the value X represents the amount of film deposition for the antifouling layer
S 1 is an F-Kα line strength of the transparent plate at the position of the fine projecting and recessed structure, measured by a fluorescent X-ray measurement device from an antifouling layer side,
S 2 is an F-Kα line strength of a reference glass plate that does not include fluorine substantially, measured by the fluorescent X-ray measurement device, and
S 3 is an F-Kα line strength of a reference aluminosilicate glass plate that includes fluorine of 2 wt %, measured by the fluorescent X-ray measurement device.
7. The transparent plate according to claim 6 , further comprising:
an antireflection layer between the transparent substrate and the antifouling layer,
wherein the antireflection layer is a multilayered film obtained by alternately laminating layers having refractive indices differing from each other, or a single layered film having a refractive index, for light having a wavelength of 550 nm, that is 1.6 or less.
8. The transparent plate according to claim 6 , wherein the transparent substrate is a glass substrate.
9. A touch pad comprising:
the transparent plate according to claim 6 ; and
a position detector configured to detect a touch position of a finger on the transparent plate.
10. A touch panel comprising:
the transparent plate according to claim 6 ;
a position detector configured to detect a touch position of a finger on the transparent plate; and
an image display device configured to display an image according to a result of detection by the position detector.