WO2011162163A1 - Glass substrate and method for manufacturing glass substrate - Google Patents
Glass substrate and method for manufacturing glass substrate Download PDFInfo
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- WO2011162163A1 WO2011162163A1 PCT/JP2011/063824 JP2011063824W WO2011162163A1 WO 2011162163 A1 WO2011162163 A1 WO 2011162163A1 JP 2011063824 W JP2011063824 W JP 2011063824W WO 2011162163 A1 WO2011162163 A1 WO 2011162163A1
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- WIPO (PCT)
- Prior art keywords
- curved surface
- glass substrate
- end surface
- grindstone
- grinding
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C19/00—Surface treatment of glass, not in the form of fibres or filaments, by mechanical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
- B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
- B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
- B24B9/10—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of plate glass
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B33/00—Severing cooled glass
- C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2204/00—Glasses, glazes or enamels with special properties
- C03C2204/08—Glass having a rough surface
Definitions
- the present invention relates to a glass substrate and a method for manufacturing the glass substrate, and more particularly to a glass substrate whose end face is ground by a grindstone and a method for manufacturing the glass substrate.
- a plurality of glass substrates used in a thin display device are processed on a single mother board, and when each processing step is completed, the glass substrate is cut to the size of each screen.
- This motherboard has a side length of, for example, 2.2 m to 3 m.
- the end face of the glass substrate is prone to crack if there are edges or minute irregularities, for example, the end face is ground into a chamfered shape or a semicircular shape to smooth the end face surface (for example, patents) Reference 1).
- a cooling fluid (coolant) is supplied to the contact part of a grindstone and the end surface of a glass substrate, and the heat_generation
- the cullet from the ground part is scattered as fine particles in the end surface grinding process, the cullet attached to the glass substrate is removed by a cleaning process after grinding.
- the grinding shape of the end face (cross-sectional shape after grinding) is ground into a chamfered shape or semicircular shape without considering the amount of cullet generation (scattering amount), etc.
- the amount of cullet generated may increase, or if the cooling due to the supply of coolant is insufficient during grinding, the glass substrate may be burned and discolored due to heat generation.
- the cullet may not be sufficiently removed by the cleaning process. Therefore, in the end surface grinding process of a glass substrate, it is an important subject to suppress the amount of cullet scattering.
- an object of the present invention is to provide a glass substrate and a method for manufacturing the glass substrate that have solved the above problems.
- the present invention has the following means.
- the present invention provides a glass substrate whose end face is ground by a grindstone.
- the end face ground on the grindstone is An upper curved surface formed on an upper portion of the end surface;
- a lower curved surface formed at a lower portion of the end surface;
- An intermediate curved surface formed between the upper curved surface and the lower curved surface;
- Each of the upper curved surface, the lower curved surface, and the intermediate curved surface has an arbitrary radius of curvature, At least the upper curved surface and the intermediate curved surface have different radii of curvature.
- the upper curved surface, the lower curved surface, and the intermediate curved surface of the present invention are characterized by forming a continuous curved surface by changing the curvature radius of adjacent curved surfaces.
- the upper curved surface, the lower curved surface, and the intermediate curved surface of the present invention are characterized by forming a continuous curved surface that approximates an approximately elliptical contour shape.
- the upper curved surface, the lower curved surface, and the intermediate curved surface of the present invention each have a radius of curvature smaller than the thickness of the glass substrate.
- the present invention is characterized in that a first recess is formed at the boundary between the upper curved surface and the intermediate curved surface, and a second recess is formed at the boundary between the lower curved surface and the intermediate curved surface.
- the first and second recesses of the present invention are characterized by extending in a direction parallel to the main plane of the glass substrate so as to have a predetermined interval in the plate thickness direction.
- the glass substrate of the present invention is characterized in that one side is a quadrangle having a length of 2.2 m or more.
- the end surface of the glass substrate of the present invention has an average roughness Ra of 0.3 ⁇ m or less.
- the thickness of the glass substrate of the present invention is 0.05 to 2.8 mm.
- the present invention provides a glass substrate manufacturing method in which an end face is ground with a grindstone. Corresponding to the upper curved surface formed at the upper part of the end surface, the lower curved surface formed at the lower part of the end surface, and the intermediate curved surface formed between the upper curved surface and the lower curved surface on the outer periphery of the grindstone Form a curved surface, The grindstone is rotated and relatively moved along the end surface of the glass substrate so that the upper curved surface, the lower curved surface, and the intermediate curved surface each have an arbitrary radius of curvature on the end surface of the glass substrate. It is characterized by that. (11) The present invention is characterized in that the upper curved surface, the lower curved surface, and the intermediate curved surface are processed so as to form a continuous curved surface by changing each radius of curvature.
- the contact area where the end surface of the glass substrate contacts the grindstone is reduced by selecting the curvature radii of the upper curved surface, the lower curved surface, and the intermediate curved surface of the end surface ground by the grindstone to an arbitrary size. As a result, the amount of cullet and heat generated during grinding can be suppressed.
- FIG. 1A is a longitudinal sectional view showing an embodiment of a glass substrate according to the present invention.
- the glass substrate 10 is a rectangular large glass panel used for a thin display device such as a liquid crystal display, a plasma display, and organic electroluminescence.
- the thickness t of the glass substrate 10 (the vertical dimension of the glass substrate 10 in FIG. 1A) is preferably 0.05 mm to 2.8 mm.
- the main plane of the glass substrate 10 is desirably a quadrangle having a side of 2.2 m or more.
- the end surface 12 of the glass substrate 10 is ground into a curved surface approximated to an elliptical shape.
- the end surface 12 includes an upper curved surface 12a formed at the upper portion of the end surface 12, a lower curved surface 12b formed at the lower portion of the end surface 12, and an intermediate curved surface 12c formed between the upper curved surface 12a and the lower curved surface 12b.
- Each of the curved surfaces 12a to 12c in the present embodiment is formed into a curved surface that approximates an approximate elliptical shape by the curvature radius R1 of the upper curved surface 12a, the curvature radius R2 of the lower curved surface 12b, and the curvature radius R3 of the intermediate curved surface 12c.
- the radius of curvature of the ellipse changes so that the total distance from two points on the long side axis is constant.
- the radius of curvature R1 to R3 is changed. It becomes possible to draw as a continuous curve.
- the long side a is the same as the thickness t of the glass substrate 10.
- 1A is a grinding region 20 to be removed by grinding. That is, the left side of the curved surfaces 12a to 12c is a grinding region 20 to be ground, and the right side of the curved surfaces 12a to 12c is the ground glass substrate 10.
- average roughness Ra is 0.3 micrometer or less.
- the angle ⁇ between the tangent line S1 of the end surface 12 of the glass substrate 10 with respect to the upper curved surface 12a and the tangent line S2 with respect to the lower curved surface 12b is set to 60 °.
- the angle ⁇ is an opening angle of the grindstone 30 and can be set to an arbitrary angle.
- the distance c to P is 0.23 mm, which is smaller than the conventional case where the end face 12 is chamfered or semicircular.
- the contact area with the grindstone is reduced as compared with a conventional chamfered shape or a semicircular shape, so that heat generation during grinding is suppressed.
- the end face 12 is ground into an elliptical shape, the cullet scattering direction moves from the main plane 14 to the end face side (in the direction away from the main plane 14) and the cullet adheres to the main plane 14 as the distance c decreases. The amount decreases.
- FIG. 1B is a longitudinal sectional view showing a relative positional relationship between the grindstone and the end surface of the glass substrate in the end surface grinding step.
- the end surface 12 of the glass substrate 10 is ground by rotating a grindstone 30.
- the grindstone 30 has diamond abrasive grains and is rotatably supported by the rotating shaft 40.
- the grindstone 30 has a processing groove having a concave curved surface that contacts the end surface 12 of the glass substrate 10 like a pulley, and a concave curved surface 32 corresponding to the curved surface shape of the end surface 12 of the glass substrate 10 and a concave curved surface 32.
- An upper collar portion 34 disposed above and a lower collar portion 36 disposed below the concave curved surface 32.
- the concave curved surface 32 is formed into an elliptical concave curved surface corresponding to the ground shape of the end surface 12 of the glass substrate 10. That is, the concave curved surface 32 is formed in an elliptical shape that is continuous by a curvature radius R1 corresponding to the upper curved surface 12a, a curvature radius R2 corresponding to the lower curved surface 12b, and a curvature radius R3 corresponding to the intermediate curved surface 12c. .
- the grinding stone 30 of the diamond abrasive grains is processed into an arbitrary shape by forming the concave curved surface 32 by electric discharge machining. Therefore, the shape of the end surface 12 of the glass substrate 10 can be ground to an arbitrary shape by bringing the concave curved surface 32 into contact with the end surface 12 of the glass substrate 10 while rotating the grindstone 30.
- FIG. 2 is a plan view schematically showing a grinding apparatus used in the end face grinding process.
- the glass substrate 10 is sucked and held in a state of being placed on the upper surface of the suction table 50 of the grinding device.
- the glass substrate 10 and the grindstone 30 are aligned so that the pair of grindstones 30 are in contact with the left and right end faces 12 of the glass substrate 10.
- each grindstone 30 is adjusted according to the height position (Y direction position) of the end surface 12 of the glass substrate 10. That is, as shown in FIG. 1A, the height position of the center of the concave curved surface 32 of the grindstone 30 and the height position of the center O of the end surface 12 of the glass substrate 10 are set to coincide with each other.
- the pair of grindstones 30 are fed in the X1 direction and the X2 direction while being rotationally driven to grind the left and right end faces 12 of the glass substrate 10. Moreover, at the time of end face grinding, a cooling liquid (coolant) is supplied to the contact part of the concave curved surface 32 of the grindstone 30 and the end face 12 of the glass substrate 10, and the heat_generation
- the glass substrate 10 When the glass substrate 10 is rotated, the glass substrate 10 may be rotated together with the suction table 50 while being adsorbed by air suction, or only the glass substrate 10 is floated by air blowing. May be rotated 90 degrees, aligned and sucked.
- each end surface 12 in the four directions of the glass substrate 10 is ground into an arbitrary shape by the grindstone 30. Moreover, since the cullet generated in the end surface grinding process is scattered in the rotation direction of the grindstone 30, it is scattered in the direction away from each end surface 12, and the adhesion amount of the main plane 14 is reduced.
- Conventional grinding method Here, a conventional grinding method will be described.
- FIG. 3 is a longitudinal sectional view for explaining a conventional glass substrate grinding method 1.
- the end surface 12 of the glass substrate 10 is ground into a chamfered shape.
- the angle between the outer surface of the end surface 12 and the chamfer is formed as a curved surface having the curvature radii R4 and R5.
- FIG. 4 is a longitudinal sectional view for explaining a conventional glass substrate grinding method 2.
- the end surface 12 of the glass substrate 10 is ground into a semicircular shape.
- FIG. 5 is a longitudinal sectional view for explaining a first modification of the glass substrate according to the present invention.
- the other conditions in the modified example 2 are the same as those described above.
- the contact area with the grindstone is reduced as compared with the conventional chamfered shape or semicircular shape. Heat generation is suppressed. Further, when the end face 12 is ground into an elliptical shape, the cullet scattering direction moves from the main plane 14 to the end face side as the distance c decreases, and the amount of cullet attached to the main plane 14 decreases.
- FIG. 6 is a longitudinal sectional view for explaining a second modification of the glass substrate according to the present invention.
- the distance c and the ratio of the long side a to the short side b are different from those in the above embodiment, but it is preferable that 0.5 ⁇ b / a ⁇ 2.0.
- the short side b is set to be smaller than that in the first embodiment and the first modification. Therefore, when the end surface 12 is ground into an elliptical shape, the contact area with the grindstone is reduced as compared with a conventional chamfered shape or a semicircular shape, so that heat generation during grinding is suppressed. Further, the distance c is smaller than that of the above-described embodiment and the first modification, and accordingly, the cullet scattering direction moves from the main plane 14 to the end face side, and the amount of cullet attached to the main plane 14 decreases. .
- FIG. 7 is a longitudinal sectional view for explaining a third modification of the glass substrate according to the present invention.
- FIG. 8 is a longitudinal sectional view showing the relative positional relationship between the grindstone of Modification 3 and the end face of the glass substrate.
- the glass substrate 10 of Modification 3 has curved surfaces 12a to 12c having three different radii of curvature on the end surface 12, and the first curved surface 12a to 12c has a first A recess 12d and a second recess 12e are formed.
- the curvature radii R1 to R3 of the curved surfaces 12a to 12c are set to values smaller than the thickness t of the glass substrate 10 and have a relationship of R1 ⁇ R2, R2 ⁇ R3, or R1 ⁇ R2 ⁇ R3. .
- the first recess 12d is provided at the boundary between the upper curved surface 12a and the intermediate curved surface 12c
- the second recess 12e is provided at the boundary between the intermediate curved surface 12c and the lower curved surface 12b.
- the third modification it is possible to suppress the amount of cullet scattering toward the main plane 14 during the end face grinding process and to suppress the heat generation of the end face 12 as compared with the embodiment and the first and second modifications.
- the end surface 12 of the modification 3 has the 1st recessed part 12d and the 2nd recessed part 12e which were recessed inside, the cullet which generate
- the curvature radii R1 and R2 of the upper curved surface 12a and the lower curved surface 12b may be different radii as described above, or may be the same radius.
- the upper curved surface 12a and the lower curved surface 12b are formed symmetrically in the vertical direction.
- the recesses 12d and 12e are formed to extend in the X direction parallel to the main plane 14 of the glass substrate 10 so as to have a predetermined interval in the plate thickness direction. Therefore, it is possible to measure (inspect) the height adjustment deviation between the grindstone 30 and the glass substrate 10 during the end face grinding process from the positions of the recesses 12d and 12e after the grinding.
- the end surface 12 of the glass substrate 10 is composed of a combination of three curved surfaces 12a to 12c having different curvature radii, and the concave portions 12d and 12e are formed at the boundaries of the curved surfaces 12a to 12c. It becomes possible to reduce the amount of cullet adhesion on the main plane 14 in the end surface grinding process.
Abstract
Description
(1)本発明は、端面を砥石により研削されるガラス基板において、
前記砥石に研削された端面は、
前記端面の上部に形成される上部曲面と、
前記端面の下部に形成される下部曲面と、
前記上部曲面と前記下部曲面との中間に形成される中間部曲面とを有し、
前記上部曲面、前記下部曲面、前記中間部曲面の夫々が任意の曲率半径を有し、
少なくとも前記上部曲面および前記中間部曲面の曲率半径が異なることを特徴とする。
(2)本発明の前記上部曲面、前記下部曲面、前記中間部曲面は、隣り合う曲面の曲率半径を変化させることで連続した曲面を形成することを特徴とする。
(3)本発明の前記上部曲面、前記下部曲面、前記中間部曲面は、ほぼ楕円形状の輪郭形状に近似する連続した曲面を形成することを特徴とする。
(4)本発明の前記上部曲面、前記下部曲面、前記中間部曲面は、夫々当該ガラス基板の厚さよりも小さい曲率半径を有することを特徴とする。
(5)本発明は、前記上部曲面と前記中間部曲面との境界に第1の凹部が形成され、前記下部曲面と前記中間部曲面との境界に第2の凹部が形成されることを特徴とする。
(6)本発明の前記第1、第2の凹部は、夫々板厚方向に所定の間隔を有するようにガラス基板の主平面と平行となる方向に延在形成されることを特徴とする。
(7)本発明の前記ガラス基板は、一辺が2.2m以上の四角形であることを特徴とする。
(8)本発明の前記ガラス基板の端面は、平均粗さRaが0.3μm以下であることを特徴とする。
(9)本発明の前記ガラス基板の厚さは、0.05~2.8mmであることを特徴とする。
(10)本発明は、端面を砥石により研削されるガラス基板の製造方法において、
前記砥石の外周に、前記端面の上部に形成される上部曲面と、前記端面の下部に形成される下部曲面と、前記上部曲面と前記下部曲面との中間に形成される中間部曲面とに対応する曲面を形成し、
前記砥石を回転させながら前記ガラス基板の端面に沿うように相対移動させて前記ガラス基板の端面に前記上部曲面、前記下部曲面、前記中間部曲面の夫々が任意の曲率半径を有するように加工することを特徴とする。
(11)本発明は、前記上部曲面、前記下部曲面、前記中間部曲面が、各曲率半径を変化させることで連続した曲面を形成するように加工することを特徴とする。 In order to solve the above problems, the present invention has the following means.
(1) The present invention provides a glass substrate whose end face is ground by a grindstone.
The end face ground on the grindstone is
An upper curved surface formed on an upper portion of the end surface;
A lower curved surface formed at a lower portion of the end surface;
An intermediate curved surface formed between the upper curved surface and the lower curved surface;
Each of the upper curved surface, the lower curved surface, and the intermediate curved surface has an arbitrary radius of curvature,
At least the upper curved surface and the intermediate curved surface have different radii of curvature.
(2) The upper curved surface, the lower curved surface, and the intermediate curved surface of the present invention are characterized by forming a continuous curved surface by changing the curvature radius of adjacent curved surfaces.
(3) The upper curved surface, the lower curved surface, and the intermediate curved surface of the present invention are characterized by forming a continuous curved surface that approximates an approximately elliptical contour shape.
(4) The upper curved surface, the lower curved surface, and the intermediate curved surface of the present invention each have a radius of curvature smaller than the thickness of the glass substrate.
(5) The present invention is characterized in that a first recess is formed at the boundary between the upper curved surface and the intermediate curved surface, and a second recess is formed at the boundary between the lower curved surface and the intermediate curved surface. And
(6) The first and second recesses of the present invention are characterized by extending in a direction parallel to the main plane of the glass substrate so as to have a predetermined interval in the plate thickness direction.
(7) The glass substrate of the present invention is characterized in that one side is a quadrangle having a length of 2.2 m or more.
(8) The end surface of the glass substrate of the present invention has an average roughness Ra of 0.3 μm or less.
(9) The thickness of the glass substrate of the present invention is 0.05 to 2.8 mm.
(10) The present invention provides a glass substrate manufacturing method in which an end face is ground with a grindstone.
Corresponding to the upper curved surface formed at the upper part of the end surface, the lower curved surface formed at the lower part of the end surface, and the intermediate curved surface formed between the upper curved surface and the lower curved surface on the outer periphery of the grindstone Form a curved surface,
The grindstone is rotated and relatively moved along the end surface of the glass substrate so that the upper curved surface, the lower curved surface, and the intermediate curved surface each have an arbitrary radius of curvature on the end surface of the glass substrate. It is characterized by that.
(11) The present invention is characterized in that the upper curved surface, the lower curved surface, and the intermediate curved surface are processed so as to form a continuous curved surface by changing each radius of curvature.
〔従来の研削方法〕
ここで、従来の研削方法について説明する。 Thus, in the end surface grinding step, each
[Conventional grinding method]
Here, a conventional grinding method will be described.
〔変形例1〕
図5は本発明によるガラス基板の変形例1を説明するための縦断面図である。図5に示されるように、変形例1では、楕円形状に形成された端面12に対する砥石30の接線S1,S2の角度αがα=52°に設定されている。尚、変形例2における他の条件は、前述した条件と同じである。 Here, a modified example will be described.
[Modification 1]
FIG. 5 is a longitudinal sectional view for explaining a first modification of the glass substrate according to the present invention. As shown in FIG. 5, in the first modification, the angle α of the tangents S1, S2 of the
図6は本発明によるガラス基板の変形例2を説明するための縦断面図である。図6に示されるように、変形例2では、楕円形状に形成された端面12に対する砥石30の接線S1,S2の角度αがα=72°に設定されている。また、変形例2では、研削量x=0.15mm、厚さt=0.7mmは、前述した条件と同じである。一方、距離c及び長辺aと短辺bとの比は、上記実施例の場合と異なるが、0.5≦b/a≦2.0であることが好ましい。 [Modification 2]
FIG. 6 is a longitudinal sectional view for explaining a second modification of the glass substrate according to the present invention. As shown in FIG. 6, in the second modification, the angle α of the tangents S1 and S2 of the
図7は本発明によるガラス基板の変形例3を説明するための縦断面図である。図8は変形例3の砥石とガラス基板の端面との相対位置関係を示す縦断面図である。 [Modification 3]
FIG. 7 is a longitudinal sectional view for explaining a third modification of the glass substrate according to the present invention. FIG. 8 is a longitudinal sectional view showing the relative positional relationship between the grindstone of Modification 3 and the end face of the glass substrate.
本出願は、2010年6月21日出願の日本特許出願(特願2010-140254)に基づくものであり、その内容はここに参照として取り込まれる。 Although this application has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
This application is based on a Japanese patent application filed on June 21, 2010 (Japanese Patent Application No. 2010-140254), the contents of which are incorporated herein by reference.
12 端面
12a 上部曲面
12b 下部曲面
12c 中間部曲面
12d 第1の凹部
12e 第2の凹部
14 主平面
20 研削領域
30 砥石
32 凹曲面
34 上鍔部
36 下鍔部
40 回転軸
50 吸着テーブル DESCRIPTION OF
Claims (11)
- 端面を砥石により研削されるガラス基板において、
前記砥石に研削された端面は、
前記端面の上部に形成される上部曲面と、
前記端面の下部に形成される下部曲面と、
前記上部曲面と前記下部曲面との中間に形成される中間部曲面とを有し、
前記上部曲面、前記下部曲面、前記中間部曲面の夫々が任意の曲率半径を有し、
少なくとも前記上部曲面および前記中間部曲面の曲率半径が異なることを特徴とするガラス基板。 In a glass substrate whose end face is ground by a grindstone,
The end face ground on the grindstone is
An upper curved surface formed on an upper portion of the end surface;
A lower curved surface formed at a lower portion of the end surface;
An intermediate curved surface formed between the upper curved surface and the lower curved surface;
Each of the upper curved surface, the lower curved surface, and the intermediate curved surface has an arbitrary radius of curvature,
A glass substrate, wherein at least the upper curved surface and the intermediate curved surface have different radii of curvature. - 前記上部曲面、前記下部曲面、前記中間部曲面は、隣り合う曲面の曲率半径を変化させることで連続した曲面を形成することを特徴とする請求項1に記載のガラス基板。 The glass substrate according to claim 1, wherein the upper curved surface, the lower curved surface, and the intermediate curved surface form a continuous curved surface by changing a curvature radius of an adjacent curved surface.
- 前記上部曲面、前記下部曲面、前記中間部曲面は、ほぼ楕円形状の輪郭形状に近似する連続した曲面を形成することを特徴とする請求項2に記載のガラス基板。 The glass substrate according to claim 2, wherein the upper curved surface, the lower curved surface, and the intermediate curved surface form a continuous curved surface that approximates a substantially elliptical contour shape.
- 前記上部曲面、前記下部曲面、前記中間部曲面は、夫々当該ガラス基板の厚さよりも小さい曲率半径を有することを特徴とする請求項1に記載のガラス基板。 The glass substrate according to claim 1, wherein each of the upper curved surface, the lower curved surface, and the intermediate curved surface has a radius of curvature smaller than a thickness of the glass substrate.
- 前記上部曲面と前記中間部曲面との境界に第1の凹部が形成され、前記下部曲面と前記中間部曲面との境界に第2の凹部が形成されることを特徴とする請求項4に記載のガラス基板。 The first concave portion is formed at a boundary between the upper curved surface and the intermediate curved surface, and the second concave portion is formed at a boundary between the lower curved surface and the intermediate curved surface. Glass substrate.
- 前記第1、第2の凹部は、夫々板厚方向に所定の間隔を有するようにガラス基板の主平面と平行となる方向に延在形成されることを特徴とする請求項5に記載のガラス基板。 6. The glass according to claim 5, wherein the first and second recesses are formed to extend in a direction parallel to the main plane of the glass substrate so as to have a predetermined interval in the plate thickness direction. substrate.
- 前記ガラス基板は、一辺が2.2m以上の四角形であることを特徴とする請求項1乃至6の何れか一項に記載のガラス基板。 The glass substrate according to any one of claims 1 to 6, wherein the glass substrate is a quadrangle having a side of 2.2 m or more.
- 前記ガラス基板の端面は、平均粗さRaが0.3μm以下であることを特徴とする請求項1乃至7の何れか一項に記載のガラス基板。 The glass substrate according to any one of claims 1 to 7, wherein the end surface of the glass substrate has an average roughness Ra of 0.3 µm or less.
- 前記ガラス基板の厚さは、0.05mm~2.8mmであることを特徴とする請求項1乃至8の何れか一項に記載のガラス基板。 The glass substrate according to any one of claims 1 to 8, wherein the glass substrate has a thickness of 0.05 mm to 2.8 mm.
- 端面を砥石により研削されるガラス基板の製造方法において、
前記砥石の外周に、前記端面の上部に形成される上部曲面と、前記端面の下部に形成される下部曲面と、前記上部曲面と前記下部曲面との中間に形成される中間部曲面とに対応する曲面を形成し、
前記砥石を回転させながら前記ガラス基板の端面に沿うように相対移動させて前記ガラス基板の端面に前記上部曲面、前記下部曲面、前記中間部曲面の夫々が任意の曲率半径を有するように加工することを特徴とするガラス基板の製造方法。 In the method of manufacturing a glass substrate whose end face is ground with a grindstone,
Corresponding to the upper curved surface formed at the upper part of the end surface, the lower curved surface formed at the lower part of the end surface, and the intermediate curved surface formed between the upper curved surface and the lower curved surface on the outer periphery of the grindstone Form a curved surface,
The grindstone is rotated and relatively moved along the end surface of the glass substrate so that the upper curved surface, the lower curved surface, and the intermediate curved surface each have an arbitrary radius of curvature on the end surface of the glass substrate. A method for producing a glass substrate, comprising: - 前記上部曲面、前記下部曲面、前記中間部曲面が、隣り合う曲面の曲率半径を変化させることで連続した曲面を形成するように加工することを特徴とする請求項10に記載のガラス基板の製造方法。 11. The glass substrate according to claim 10, wherein the upper curved surface, the lower curved surface, and the intermediate curved surface are processed so as to form a continuous curved surface by changing a curvature radius of adjacent curved surfaces. Method.
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JP2016132605A (en) * | 2015-01-21 | 2016-07-25 | AvanStrate株式会社 | Method for manufacturing glass substrate |
JPWO2014196500A1 (en) * | 2013-06-03 | 2017-02-23 | 日本電気硝子株式会社 | Glass tape, glass tape manufacturing method, and product manufacturing method |
JP2020536035A (en) * | 2017-10-04 | 2020-12-10 | サン−ゴバン グラス フランス | Composite glass pane with chamfered through holes |
EP3998245A4 (en) * | 2019-07-10 | 2023-08-02 | Agc Inc. | Glass substrate and method for manufacturing same |
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