US 12,227,445 B2
Glass plate suitable for image display device
Masahiro Ikadai, Mie (JP); Shinji Oizumi, Kanagawa (JP); Junichi Kiriyama, Tokyo (JP); and Tsutomu Tanoue, Tokyo (JP)
Assigned to NIPPON SHEET GLASS COMPANY, LIMITED, Tokyo (JP)
Appl. No. 17/258,060
Filed by Nippon Sheet Glass Company, Limited, Tokyo (JP)
PCT Filed Jul. 1, 2019, PCT No. PCT/JP2019/026130
§ 371(c)(1), (2) Date Jan. 5, 2021,
PCT Pub. No. WO2020/013012, PCT Pub. Date Jan. 16, 2020.
Claims priority of application No. 2018-130000 (JP), filed on Jul. 9, 2018; application No. 2019-017246 (JP), filed on Feb. 1, 2019; and application No. 2019-081614 (JP), filed on Apr. 23, 2019.
Prior Publication US 2021/0230052 A1, Jul. 29, 2021
Int. Cl. C03C 15/00 (2006.01); G02B 1/118 (2015.01); G02F 1/1333 (2006.01); G02F 1/1335 (2006.01)
CPC C03C 15/00 (2013.01) [G02B 1/118 (2013.01); G02F 1/1333 (2013.01); G02F 1/133302 (2021.01); G02F 1/133502 (2013.01); G02F 2202/09 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A glass plate comprising a main surface having a plurality of minute deformed portions, wherein
the plurality of minute deformed portions are a plurality of recesses or a plurality of projections,
where an average value of lengths of two sides adjacent to each other of a minimum quadrilateral with four right angles surrounding each minute deformed portion as observed from a direction perpendicular to the main surface is defined as a dimension of the minute deformed portion, and an average value of the dimensions of the plurality of minute deformed portions is 3.2 μm to 35.5 μm,
at least one of the following conditions is satisfied:
a condition a1 that a ratio of minute deformed portions A1 having the dimensions of 0.5 μm to 3.0 μm with respect to the plurality of minute deformed portions in terms of number is less than 5%; and
a condition d1 that a coefficient of variation of the dimensions of the plurality of minute deformed portions is 40% or less, and
3 to 30 bright spots are observed on a 2-dimensional Fourier transform image of a processed image having been subjected to binarization processing A for discriminating the plurality of minute deformed portions from their surrounding region in a 200 μm square region on the main surface observed from the above direction, or one bright spot is observed on the 2-dimensional Fourier transform image of the processed image having been subjected to the binarization processing A and two or more bright spots are observed on a 2-dimensional Fourier transform image of a processed image having been subjected to binarization processing B instead of the binarization processing A,
where the binarization processing A is binarization processing performed with an image divided into pixels of 256×256, and the binarization processing B is binarization processing performed with an image divided into pixels of 65536×65536.