US 2026/0118554 A1Published application

Glass plate and method for producing same, in-vehicle display device, and method for selecting glass plate

AssigneeAGC Inc.

InventorsMinoru TAMADA, Aichi INOUE

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Abstract

The present invention relates to a glass plate having a first main surface and a second main surface facing the first main surface, wherein the first main surface has an uneven structure on at least a portion thereof, the visibility index value T on the outermost surface of the region having the uneven structure on the first main surface side is 0.85 or more, the glare index value S is 0.80 or more, the average dynamic friction coefficient COF is 0.50 or less, the friction change amount delta is more than −0.210, and the lightness L* value is 4.7 or less.

Claims19

Dependent claims

A glass plate comprising:

a first main surface;
and
a second main surface opposite to the first main surface, wherein
the first main surface has an uneven structure in at least a part thereof,
the glass plate has a clarity index value T of 0.85 or more, an anti-sparkle index value S of 0.80 or more, an average dynamic friction coefficient COF of 0.50 or less, and a friction change amount delta of more than −0.210 on an outermost surface of a region having the uneven structure on a first main surface side,
the glass plate has a brightness L* value of 4.7 or less in a specular component exclude (SCE) method, as measured by using a method in accordance with ASTM E313-73 standard, and
the clarity index value T, the anti-sparkle index value S, the average dynamic friction coefficient COF, and the friction change amount delta are quantified by methods shown below:
clarity index value T:
SMS-1000 manufactured by DM&S is used, the glass plate is provided at a position 30 mm away from above a slit-shaped white light source having a length of 40 mm and a width of 0.1 mm such that the first main surface side is a light source side, and luminance on the outermost surface of the region having the uneven structure is measured from a second main surface side of the glass plate, a camera lens used is a lens having a focal distance of 16 mm at a diaphragm of 5.6, and a distance from the outermost surface of the glass plate on the first main surface side to the camera lens is set to 550 mm, and when a direction parallel to a thickness direction of the glass plate is defined as an angle θ=0°, an average value of luminance in a range of the angle θ=0°±0.1° is defined as T1, an average value of luminance in a range of the angle θ=0.70±0.1° is defined as T2, and an average value of luminance in a range of the angle θ=−0.7°±0.1° is defined as T3, a value calculated according to the following equation (1) is defined as the clarity index value T,
Clarity
⁢
index
⁢
value
⁢
T
=
1
-
(
T
2
+
T
3
)
/
(
2
×
T
1
)
Equation
⁢
(
1
)
anti-sparkle index value S:
the glass plate is disposed on a display surface side of a display device having a resolution of 264 ppi such that the second main surface is in contact with the display surface side, a sparkle value on the outermost surface of the region having the uneven structure is defined as an anti-sparkle Sa, where the sparkle value is determined by image analysis using SMS-1000 manufactured by DM&S provided on the first main surface side of the glass plate in a state where a green monochromatic image composed of RGB (0, 255, 0) is displayed on the display device, a distance d between the SMS-1000 manufactured by DM&S and the outermost surface of the glass plate on the first main surface side is set to 540 mm, and a camera lens used is a lens having a focal distance of 50 mm at a diaphragm of 5.6, in addition, a glass substrate (VRD140 glass, manufactured by AGC Glass Europe) having the same thickness as the glass plate, as a reference sample, is also subjected to image analysis under the same conditions, and the determined sparkle value is defined as an anti-sparkle Ss, and a value calculated based on the values of Sa and Ss according to the following equation (2) is defined as the anti-sparkle index value S,
Anti
-
sparkle
⁢
index
⁢
value
⁢
S
=
1
-
(
S
a
/
S
s
)
Equation
⁢
(
2
)
average dynamic friction coefficient COF and friction change amount delta:
a dynamic friction coefficient is measured by sliding a pseudo finger at a scanning distance of 50 mm, a load of 100 g, and a scanning speed of 100 mm/sec on the outermost surface of the region having the uneven structure on the first main surface side of the glass plate in an environment of a room temperature of 23° C. and a humidity of 21% in a static and dynamic friction measuring machine, a data acquisition frequency is set to 1 kHz, the pseudo finger is made of urethane, and a contact portion with the outermost surface is formed with linear convex portions in a direction perpendicular to a sliding direction at an interval of 0.5 mm in an area of 10 mm×15 mm, and here, when going back from a time at which the dynamic friction coefficient is at maximum, a time point at which the dynamic friction coefficient is 0 or less for the first time is defined as a movement start time point, and a time point at which the dynamic friction coefficient is 5 or less for the first time after a time point represented by {(the movement start time point)+(0.75×the scanning distance/the scanning speed)} is defined as a movement end time point, a value calculated according to the following equation (3) is defined as the average dynamic friction coefficient COF, and a value calculated according to the following equation (4) is defined as the friction change amount delta.
Average
⁢
dynamic
⁢
friction
⁢
coefficient
⁢
COF
=
average
⁢
value
⁢
of
⁢
dynamic
⁢
friction
⁢
coefficients
⁢
at
⁢
(
intermediate
⁢
time
⁢
point
⁢
between
⁢
the
⁢
movement
⁢
start
⁢
time
⁢
point
⁢
and
⁢
the
⁢
movement
⁢
end
⁢
time
⁢
point
)
±
0.2
seconds
Equation
⁢
(
3
)
Friction
⁢
change
⁢
amount
⁢
delta
=
(
maximum
⁢
dynamic
⁢
friction
⁢
coefficient
⁢
after
⁢
the
⁢
movement
⁢
end
⁢
time
⁢
point
)
-
(
the
⁢
average
⁢
dynamic
⁢
friction
⁢
coefficient
⁢
COF
)
Equation
⁢
(
4
)

174 more elements

Dependencies are inferred from the claim text.

Facts

Application: 19/431,164Filed 23 Dec 2025
Priority: JP 2023-10611028 Jun 2023
Published: 30 Apr 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

C03C 15/00
Surface treatment of glass, not in the form of fibres or filaments
G02B 1/11
Optical coatings produced by application to, or surface treatment of, optical elements: anti-reflection coatings
C03C 17/3417
With at least two coatings of inorganic materials: all coatings being oxide coatings
G02B 1/12
Optical coatings produced by application to, or surface treatment of, optical elements: by surface treatment, e.g. by irradiation

Family

Application19/431,164Continuation
US 2026/0118554 A1This patent

From the US filing history. Foreign family members aren’t listed.

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Abstract

A glass plate comprising:

a first main surface;
and
a second main surface opposite to the first main surface, wherein
the first main surface has an uneven structure in at least a part thereof,
the glass plate has a clarity index value T of 0.85 or more, an anti-sparkle index value S of 0.80 or more, an average dynamic friction coefficient COF of 0.50 or less, and a friction change amount delta of more than −0.210 on an outermost surface of a region having the uneven structure on a first main surface side,
the glass plate has a brightness L* value of 4.7 or less in a specular component exclude (SCE) method, as measured by using a method in accordance with ASTM E313-73 standard, and
the clarity index value T, the anti-sparkle index value S, the average dynamic friction coefficient COF, and the friction change amount delta are quantified by methods shown below:
clarity index value T:
SMS-1000 manufactured by DM&S is used, the glass plate is provided at a position 30 mm away from above a slit-shaped white light source having a length of 40 mm and a width of 0.1 mm such that the first main surface side is a light source side, and luminance on the outermost surface of the region having the uneven structure is measured from a second main surface side of the glass plate, a camera lens used is a lens having a focal distance of 16 mm at a diaphragm of 5.6, and a distance from the outermost surface of the glass plate on the first main surface side to the camera lens is set to 550 mm, and when a direction parallel to a thickness direction of the glass plate is defined as an angle θ=0°, an average value of luminance in a range of the angle θ=0°±0.1° is defined as T1, an average value of luminance in a range of the angle θ=0.70±0.1° is defined as T2, and an average value of luminance in a range of the angle θ=−0.7°±0.1° is defined as T3, a value calculated according to the following equation (1) is defined as the clarity index value T,
Clarity
⁢
index
⁢
value
⁢
T
=
1
-
(
T
2
+
T
3
)
/
(
2
×
T
1
)
Equation
⁢
(
1
)
anti-sparkle index value S:
the glass plate is disposed on a display surface side of a display device having a resolution of 264 ppi such that the second main surface is in contact with the display surface side, a sparkle value on the outermost surface of the region having the uneven structure is defined as an anti-sparkle Sa, where the sparkle value is determined by image analysis using SMS-1000 manufactured by DM&S provided on the first main surface side of the glass plate in a state where a green monochromatic image composed of RGB (0, 255, 0) is displayed on the display device, a distance d between the SMS-1000 manufactured by DM&S and the outermost surface of the glass plate on the first main surface side is set to 540 mm, and a camera lens used is a lens having a focal distance of 50 mm at a diaphragm of 5.6, in addition, a glass substrate (VRD140 glass, manufactured by AGC Glass Europe) having the same thickness as the glass plate, as a reference sample, is also subjected to image analysis under the same conditions, and the determined sparkle value is defined as an anti-sparkle Ss, and a value calculated based on the values of Sa and Ss according to the following equation (2) is defined as the anti-sparkle index value S,
Anti
-
sparkle
⁢
index
⁢
value
⁢
S
=
1
-
(
S
a
/
S
s
)
Equation
⁢
(
2
)
average dynamic friction coefficient COF and friction change amount delta:
a dynamic friction coefficient is measured by sliding a pseudo finger at a scanning distance of 50 mm, a load of 100 g, and a scanning speed of 100 mm/sec on the outermost surface of the region having the uneven structure on the first main surface side of the glass plate in an environment of a room temperature of 23° C. and a humidity of 21% in a static and dynamic friction measuring machine, a data acquisition frequency is set to 1 kHz, the pseudo finger is made of urethane, and a contact portion with the outermost surface is formed with linear convex portions in a direction perpendicular to a sliding direction at an interval of 0.5 mm in an area of 10 mm×15 mm, and here, when going back from a time at which the dynamic friction coefficient is at maximum, a time point at which the dynamic friction coefficient is 0 or less for the first time is defined as a movement start time point, and a time point at which the dynamic friction coefficient is 5 or less for the first time after a time point represented by {(the movement start time point)+(0.75×the scanning distance/the scanning speed)} is defined as a movement end time point, a value calculated according to the following equation (3) is defined as the average dynamic friction coefficient COF, and a value calculated according to the following equation (4) is defined as the friction change amount delta.
Average
⁢
dynamic
⁢
friction
⁢
coefficient
⁢
COF
=
average
⁢
value
⁢
of
⁢
dynamic
⁢
friction
⁢
coefficients
⁢
at
⁢
(
intermediate
⁢
time
⁢
point
⁢
between
⁢
the
⁢
movement
⁢
start
⁢
time
⁢
point
⁢
and
⁢
the
⁢
movement
⁢
end
⁢
time
⁢
point
)
±
0.2
seconds
Equation
⁢
(
3
)
Friction
⁢
change
⁢
amount
⁢
delta
=
(
maximum
⁢
dynamic
⁢
friction
⁢
coefficient
⁢
after
⁢
the
⁢
movement
⁢
end
⁢
time
⁢
point
)
-
(
the
⁢
average
⁢
dynamic
⁢
friction
⁢
coefficient
⁢
COF
)
Equation
⁢
(
4
)

174 more elements

Facts

Application

19/431,164Filed 23 Dec 2025

Priority

JP 2023-10611028 Jun 2023

Published

30 Apr 2026

Term ends

Not estimatedThe source records don’t support an estimate.

Classification11 codes

C03C 15/00
Surface treatment of glass, not in the form of fibres or filaments
G02B 1/11
Optical coatings produced by application to, or surface treatment of, optical elements: anti-reflection coatings
C03C 17/3417
With at least two coatings of inorganic materials: all coatings being oxide coatings
G02B 1/12
Optical coatings produced by application to, or surface treatment of, optical elements: by surface treatment, e.g. by irradiation