Glass article, onboard display device, and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-2025277921-A1
Application number	US-202519210405-A
Country	US
Kind code	A1
Filing date	May 16, 2025
Priority date	Nov 18, 2022
Publication date	Sep 4, 2025
Grant date	—

Abstract

The present invention relates to a glass article having first and second main surfaces and an end surface, in which the end surface includes a side surface portion and a first chamfered portion having a curved surface shape, the first main surface and the first chamfered portion include an antireflection layer, in a region where an angle formed between the first chamfered portion and the first main surface is greater than 0° and 40° or less, an average value Ra 1 of Ra is 0.20 μm or less, in a region where the angle is greater than 80° and in the side surface portion, an average value Ra 3 of Ra is 0.30 μm or more, and in a region where the angle is 60° or more and 80° or less, an average value Ra 2 of Ra satisfies 0.2≤(Ra 2 −Ra 1 )/(Ra 3 −Ra 1 )≤0.8.

First claim

What is claimed is:

1 . A glass article comprising:
a first main surface; a second main surface; and an end surface connecting the first main surface and the second main surface, wherein the end surface includes a side surface portion and a first chamfered portion having a curved surface shape connecting the side surface portion and the first main surface, the first main surface and the first chamfered portion include an antireflection layer, in a region where an angle formed between the first chamfered portion and the first main surface is greater than 0° and 40° or less, an average value Ra 1 of an arithmetic mean roughness Ra on a surface of the glass article is 0.20 μm or less, in a region where the angle formed between the first chamfered portion and the first main surface is greater than 80° and in the side surface portion, an average value Ra 3 of the arithmetic mean roughness Ra on the surface of the glass article is 0.30 μm or more, and in a region where the angle formed between the first chamfered portion and the first main surface is 60° or more and 80° or less, an average value Ra 2 of the arithmetic mean roughness Ra on the surface of the glass article satisfies the following expression (1).

0.2
≤

(

Ra
2

-

Ra
1

)

/

(

Ra
3

-

Ra
1

)

≤

0
.
8

(
1
)

2 . The glass article according to claim 1 , wherein the first chamfered portion has a width of 0.5 mm or more and 5.0 mm or less.

3 . The glass article according to claim 1 , wherein the region where the angle formed between the first chamfered portion and the first main surface is greater than 0° and 40° or less has a width of 0.43 mm or more and 4.8 mm or less.

4 . The glass article according to claim 1 , wherein a relationship between an arithmetic mean roughness Ra 40° on the surface of the glass article at a point where the angle formed between the first chamfered portion and the first main surface is 40°, an arithmetic mean roughness Ra 60° on the surface of the glass article at a point where the angle formed between the first chamfered portion and the first main surface is 60°, and an arithmetic mean roughness Ra 80° on the surface of the glass article at a point where the angle formed between the first chamfered portion and the first main surface is 80° is Ra 40° <Ra 60° <Ra 80° .

5 . The glass article according to claim 1 , wherein regarding a color tone of reflected light in an L*a*b* color system at each measurement point of the first chamfered portion, which is measured by using the following measurement method, an average value of a* at the measurement points that satisfy L*≥5 is 0 or more and 15.0 or less, (measurement method)
in the first chamfered portion, a perpendicular line at a point where the angle formed between the first chamfered portion and the first main surface is 45° is used as a reference, white light is incident on a side surface portion side at an angle of 10°, and an image is obtained by using a two-dimensional spectroradiometer at an angle of 10° toward a first main surface side, and in the image, the measurement point is defined by segmenting the image for each pixel, and the color tone at each measurement point is calculated in the L*a*b* color system.

6 . The glass article according to claim 1 , wherein a color tone of reflected light from the first main surface satisfies −3<a*<3 and −3<b*<3 in an L*a*b* color system.

7 . The glass article according to claim 1 , wherein
the end surface includes the side surface portion and a second chamfered portion connecting the side surface portion and the second main surface, and a parameter R defined by the following expression (2) satisfies an expression (3):

R
=

0.38
·

E

c
⁢
g

-

A
/
t

-

2.61
·
B

/
t

+

4.38
·
C

/
t

-

10.6
·
D

/
t

(
2
)

R
≤
23.58

(
3
)

in the expression (2), E cg represents a Young's modulus (GPa) of the glass article, A represents a width (mm) of the first chamfered portion, B represents a width (mm) of the second chamfered portion, C represents a thickness (mm) of the side surface portion, D represents a thickness (mm) of the first chamfered portion, and t represents a thickness (mm) of the glass article.

8 . The glass article according to claim 7 , wherein
the width A of the first chamfered portion is 2.0 mm or less, a glass article thickness ratio (A/t), which is a rat

Assignees

• Agc Inc

Inventors

• Kawata Toru
• Masuda Yuichi
• Ishino Akihisa
• Ono Takeaki
• Hokari Ryou

Classifications

• B60K35/50

  Instruments characterised by their means of attachment to or integration in the vehicle (B60K35/231 takes precedence) · CPC title

• B60K2360/92

  Manufacturing of instruments · CPC title

• B60K2360/25

  using filters · CPC title

• B60K35/22

  Display screens · CPC title

• B24B9/10

  of plate glass · CPC title