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Glass substrate

A glass substrate and main surface technology, applied in glass molding, glass molding, glass manufacturing equipment, etc., can solve the problems of glass substrate damage, easy adhesion of glass substrates, etc., and achieve low-cost effects

Inactive Publication Date: 2020-06-30
NIPPON ELECTRIC GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the charged glass substrate tends to stick to the mounting table, and there is also a possibility that the glass substrate may be damaged by forcibly peeling it off.

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 approach 》

[0033] Below, refer to Figure 1 ~ Figure 3 A first embodiment of the present invention will be described.

[0034] Such as figure 1As shown, the glass substrate 1 of the present embodiment is formed in a rectangular shape, and is formed of, for example, silicate glass, silica glass, or the like, preferably borosilicate glass, and more preferably alkali-free glass. In this case, as an example of the glass composition of the glass substrate 1, it is possible to include SiO by mass %. 2 : 50%~70%, Al 2 o 3 : 12% to 25%, B 2 o 3 : 0%-12%, MgO: 0%-8%, CaO: 0%-15%, SrO: 0%-12%, BaO: 0%-15%.

[0035] In addition, the alkali-free glass mentioned here means the glass which does not contain an alkali component (alkali metal oxide) substantially, Specifically, it means the glass whose alkali component is 3000 ppm or less. From the viewpoint of at least preventing or reducing deterioration over time, glass with an alkali component of 1000 ppm or less is preferable, glass with an a...

no. 2 approach 》

[0060] Figure 4 An example of the distribution of surface roughness Ra of the second main surface 3 of the glass substrate 1 according to the second embodiment of the present invention is shown. Figure 4 , the height of the histogram indicates the size of the surface roughness Ra, and the numbers or symbols in parentheses described above or on the side of the histogram respectively indicate figure 1 The position on the second main surface 3 of the glass substrate 1 shown in . Such as Figure 4 As shown, in the present embodiment, also in the outer peripheral region 5 of the second main surface 3, a surface roughened region A having a surface roughness Ra greater than the surface roughness Ra of the central region 4 by 0.2 nm or more is provided. .

[0061] In addition, in this embodiment, in addition to the above configuration, the surface roughness region A extends along the long side portion 7 and the surface roughness Ra of the outer peripheral region 5 decreases as th...

no. 3 approach 》

[0070] Figure 6 An example of the distribution of surface roughness Ra of the second main surface 3 of the glass substrate 1 according to the third embodiment of the present invention is shown. Figure 6 , the height of the histogram indicates the size of the surface roughness Ra, and the numbers or symbols in parentheses described above or on the side of the histogram respectively indicate figure 1 The position on the second main surface 3 of the glass substrate 1 shown in . Such as Figure 6 As shown, in the present embodiment, also in the outer peripheral region 5 of the second main surface 3, a surface roughened region A having a surface roughness Ra greater than the surface roughness Ra of the central region 4 by 0.2 nm or more is provided. .

[0071] In addition, in the present embodiment, the surface-roughened region A is provided at one of the four corners defining the second main surface 3 . "Roughened surface area A is provided at the corner" refers to the surfa...

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Abstract

A glass substrate (1) has a first major surface (2) and a second major surface (3). The first major surface (2) has a surface roughness Ra of 0.2 nm or less and the second major surface (3) has a surface roughness Ra in a center region (4) thereof of 0.3 to 1.0 nm. The second major surface (3) has, in an outer peripheral region (5), a roughened region (A) that has a surface roughness Ra that is greater than the surface roughness Ra of the center region (4) by 0.2 nm or more.

Description

technical field [0001] The invention relates to a glass substrate. Background technique [0002] As is well known, regarding image display devices in recent years, flat panel displays (hereinafter referred to as FPDs) represented by liquid crystal displays (LCDs), plasma displays (PDPs), field emission displays (FEDs), organic EL displays (OELDs), etc. ) became mainstream. With regard to these FPDs, weight reduction is being promoted, and therefore there is an increasing demand for thinner glass substrates used in FPDs. [0003] The above-mentioned glass substrate is obtained by cutting sheet glass (ribbon sheet glass) formed into a ribbon shape by, for example, a sheet glass forming method typified by various down-draw methods, into a predetermined size in the longitudinal direction, After further cutting both ends of the cut sheet glass in the width direction (the direction parallel to the main surface of the ribbon-shaped sheet glass and perpendicular to the longitudina...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C15/00
CPCC03C15/00C03C23/00C03C3/083C03B17/064C03C2218/34
Inventor 奥隼人山本好晴中塚弘树
Owner NIPPON ELECTRIC GLASS CO LTD
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