WO2023100744A1 - Method for manufacturing glass substrate, method for manufacturing pedestal, glass substrate, and pedestal - Google Patents

Abstract

The present invention pertains to a method which is for manufacturing a glass substrate and which involves: fixing, to the surface of a pedestal, at least a part of a glass plate provided with a main face having a curved surface that has a plurality of curvature radii; and performing a prescribed process on the glass plate. The surface of the pedestal has a shape substantially identical to at least a part of the curved shape of the main face of the glass plate.

Description

Method for manufacturing glass substrate, method for manufacturing base, glass substrate, and base

The present invention relates to a method for manufacturing a glass substrate, a method for manufacturing a pedestal, a glass substrate, and a pedestal.

In the production process of glass substrates, a process of applying shape processing to a glass plate whose main surface is curved, and a process of applying additional processing such as printing and coating are known.

These processes are performed by fixing the glass plate on the pedestal. For example, as shown in Patent Document 1, a curved plate is installed on the surface of a table as a base. The surface of the table is curved following the curved plate. Patent Literature 1 discloses a technique for correcting a deviation that occurs between a curved plate and a table when the curved plate is placed on the table surface.

Japanese Patent Application Laid-Open No. 2015-229232

In this way, a gap was created between the glass plate whose main surface was curved and the pedestal. Therefore, when fixing the glass plate on the pedestal, an external force was applied to force the glass plate to follow the surface of the pedestal so as to eliminate the gap. However, at this time, internal stress is generated in the glass sheet, which causes problems such as the development of microcracks generated during shaping and the occurrence of chipping.

In particular, when the main surface of the glass plate had a complicated shape that could not be developed flat, even if an external force was applied to press the glass plate against the pedestal, the gap could not be eliminated and it could not be fixed properly. In addition, as the external force becomes stronger, as described above, the internal stress generated in the glass sheet causes defects such as the development of microcracks that occur during shape processing.

The present invention has been made in view of the above problems, and manufactures a glass substrate that can reduce the internal stress generated in the glass plate when the glass plate is fixed to the surface of the pedestal and can suppress the development of microcracks. The purpose is to provide a method.

Another object of the present invention is to provide a method for manufacturing a pedestal used for manufacturing a glass substrate, and the pedestal. Another object of the present invention is to provide a glass substrate in which propagation of microcracks is suppressed.

In order to solve the above problems, according to one aspect of the present invention, at least a portion of a glass plate having a main surface having a curved surface with a plurality of radii of curvature is fixed to the surface of a pedestal, and the glass plate has a predetermined curvature. wherein the surface of the pedestal has substantially the same shape as at least part of the curved shape of the main surface itself of the glass plate. provided.

Further, according to one aspect of the present invention, at least part of a glass plate having a main surface having a curved surface with a plurality of radii of curvature is fixed in close contact with the surface of a base, and the glass plate is fixed by the fixation. The generated internal stress is 10 MPa or less, and a method for manufacturing a glass substrate is provided in which the glass plate is fixed to the surface of the pedestal and subjected to a predetermined processing.

Further, according to one aspect of the present invention, there is provided a method for manufacturing a pedestal for fixing a glass plate, wherein the glass plate has a principal surface having a curved surface having a plurality of radii of curvature, and the pedestal A method for manufacturing a pedestal is provided in which at least part of the surface is modeled in substantially the same shape as at least part of the curved shape of the main surface itself of the glass plate.

Further, according to one aspect of the present invention, there is provided a method of manufacturing a pedestal for fixing a glass plate, wherein the glass plate has a principal surface having a curved surface having a plurality of radii of curvature, and the principal surface is measured with a 3D scanner, and based on the acquired shape data, at least a portion of the surface of the pedestal is formed.

Further, according to one aspect of the present invention, there is provided a method for manufacturing a pedestal for fixing a glass plate, wherein the glass plate has a principal surface having a curved surface having a plurality of radii of curvature, and the pedestal has , a method for manufacturing a pedestal, including a thermoplastic resin, and hardening the thermoplastic resin by pressing at least a portion of the main surface against a surface of the thermoplastic resin in a softened state.

Further, according to one aspect of the present invention, the main surface is provided with a curved surface having a plurality of radii of curvature, and at least one end surface that connects the opposing main surfaces includes an edge surface and the edge surface. A glass substrate is provided having a chamfered surface located between each major surface, the chamfered surface having a concave surface.

Further, according to one aspect of the present invention, there is provided a pedestal for fixing a glass plate, wherein the glass plate has a main surface having a curved surface having a plurality of radii of curvature, and at least a surface of the pedestal A pedestal is provided, a portion of which has the curved shape of the main surface itself.

Further, according to one aspect of the present invention, there is provided a pedestal for fixing a glass plate, wherein at least part of the surface of the pedestal is two or more tangential axes that intersect at an arbitrary point on the surface. A pedestal is provided having a non-flattable shape with a radius of curvature about an axis.

According to one aspect of the present invention, there is provided a method for manufacturing a glass substrate that can reduce the internal stress generated in the glass plate when the glass plate is fixed to the surface of the pedestal and suppress the development of microcracks, and a method for producing microcracks. A glass substrate with reduced growth is provided.
ADVANTAGE OF THE INVENTION According to one aspect of the present invention, a method for manufacturing a pedestal provided with a surface modeled on the principal surface of a glass plate, and the pedestal are provided simply and with high accuracy.

FIG. 1A is a schematic diagram for explaining a problem of a conventional glass substrate manufacturing method. FIG. 1B is a schematic diagram for explaining a problem of the conventional glass substrate manufacturing method. FIG. 1C is a schematic diagram for explaining a problem of the conventional glass substrate manufacturing method. FIG. 2A is a schematic diagram for explaining a method for manufacturing a glass substrate according to one embodiment of the present invention. FIG. 2B is a schematic diagram for explaining a method for manufacturing a glass substrate according to one embodiment of the present invention. FIG. 2C is a schematic diagram for explaining a method for manufacturing a glass substrate according to one embodiment of the present invention. FIG. 3A is a schematic diagram showing an example of a shape processing process for the glass plate fixed to the surface of the pedestal. FIG. 3B is a schematic diagram showing an example of a shape processing process for the glass plate fixed to the surface of the pedestal. FIG. 3C is a schematic diagram showing an example of a shape processing process for the glass plate fixed to the surface of the pedestal. FIG. 4A is a schematic diagram showing a cuttable internal stress confirmation test when compressive stress is applied to the surface of a glass plate for cutting with a cutter. FIG. 4B is a schematic diagram showing a cuttable internal stress confirmation test when a tensile stress is applied to the surface of a glass plate for cutting with a cutter. FIG. 5A is a schematic diagram showing a cuttable internal stress confirmation test when applying compressive stress to the surface of a glass plate for laser cutting. FIG. 5B is a schematic diagram showing a cuttable internal stress confirmation test when a tensile stress is applied to the surface of the glass plate for laser cutting. FIG. 6A is a cross-sectional view for explaining a method of manufacturing a pedestal according to one embodiment of the present invention. FIG. 6B is a cross-sectional view for explaining a method of manufacturing a pedestal according to one embodiment of the present invention. FIG. 7A is a cross-sectional view for explaining a method of manufacturing a pedestal according to an embodiment different from FIGS. 6A and 6B. FIG. 7B is a cross-sectional view for explaining a method of manufacturing a pedestal according to an embodiment different from FIGS. 6A and 6B. FIG. 7C is a cross-sectional view for explaining a method of manufacturing a pedestal according to an embodiment different from FIGS. 6A and 6B. FIG. 8 is a perspective view of the glass substrate of one embodiment of the present invention. FIG. 9A is a plan view of a glass substrate according to one embodiment of the invention. FIG. 9B is a front view of the glass substrate of one embodiment of the invention. FIG. 9C is a side view of the glass substrate of one embodiment of the invention. FIG. 10 is a partially enlarged sectional view enlarging the end surface of the glass substrate in one embodiment of the present invention. FIG. 11A is a partially enlarged sectional view enlarging an end surface of a conventional glass substrate. FIG. 11B is a perspective view for explaining a conventional shaping process of the end surface of the glass substrate. FIG. 12A is a perspective view of a pedestal manufactured by the method shown in FIGS. 6A and 6B. FIG. 12B is a graph showing the height difference between the surface of the pedestal of Example 1 as an embodiment shown in FIG. 12A and the pedestal of Example 2 as a conventional example.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In each drawing, the same or corresponding configurations are denoted by the same or corresponding reference numerals, and description thereof is omitted.
Definitions of terms are appropriately explained in the specification. Terms that are not specifically explained are to be interpreted with their commonly known meanings.

[Background leading up to the present embodiment]
A shape processing process applied to a glass plate having a curved main surface and additional processing such as printing and coating are performed while the glass plate is fixed to a base. In particular, in the shape processing process, since a processing load is applied to the glass plate, a pedestal that can adhere and fix the main surface of the glass plate in order to prevent chattering and displacement is required.
Conventionally, the pedestal has been produced in accordance with the designed shape of the glass substrate. Problems of the conventional glass substrate manufacturing method will be described with reference to FIGS. 1A to 1C.

FIG. 1A is a cross-sectional view schematically showing a glass plate 1 in which principal surfaces 1a and 1b are curved surfaces having a plurality of radii of curvature. Here, the "principal surface" refers to the surface having the largest area. As shown in FIG. 1A, the main surfaces correspond to the front and back surfaces of the glass plate 1 facing each other. Both the front and back surfaces of the glass plate 1 have the same curved surface shape or a similar shape. The same applies to FIG. 2 and subsequent figures. FIG. 1B is a cross-sectional view schematically showing a pedestal 2 in which a surface 2a is formed with a curved surface having a plurality of radii of curvature based on the shape design values of the main surfaces 1a and 1b of the glass plate 1. As shown in FIG. As shown in FIG. 1C, the shape processing process and the additional processing process described above are performed while the glass plate 1 shown in FIG. 1A is fixed to the surface 2a of the pedestal 2 shown in FIG. 1B.

However, as shown in FIG. 1C, when the glass plate 1 was placed on the surface 2a of the pedestal 2, a gap 3 was created between the glass plate 1 and the pedestal 2. That is, the designed shape of the surface 2a of the base 2 deviated from the curved surface shape of the main surface 1a of the actually formed glass plate 1, resulting in a shape error. Thus, when the gap 3 is generated between the glass plate 1 and the pedestal 2, it is necessary to apply an external force to the glass plate 1 to forcibly follow the shape of the surface 2a of the pedestal 2 and fix it. Met.

At this time, internal stress is generated in the glass plate 1 by applying a strong external force to the glass plate 1 . When this internal stress increased, microcracks generated during shaping progressed and defects such as chipping occurred.

Further, when the main surfaces 1a and 1b of the glass plate 1 have a complicated curved surface shape that cannot be expanded on a plane, even if an external force is applied to the glass plate 1, the surface 2a of the pedestal 2 is not followed. Therefore, there is a problem that the glass plate 1 cannot be properly fixed to the surface 2a of the pedestal 2. FIG.

As a result of extensive research, the inventors of the present invention have invented a method for manufacturing a glass substrate that can reduce the internal stress generated when the glass plate is fixed to the surface of the pedestal and that can suppress the development of microcracks. rice field.

[Outline description of a method for manufacturing a glass substrate according to an embodiment of the present invention]
An outline of a method for manufacturing a glass substrate according to one embodiment of the present invention will be described. FIG. 2A is a cross-sectional view schematically showing a glass plate 4 in which principal surfaces 4a and 4b are curved surfaces having a plurality of radii of curvature. The shape of each main surface 4a, 4b is, for example, a rectangular shape in plan view. The shape of the main surfaces 4a and 4b may be trapezoidal, circular, or elliptical in plan view, and is not particularly limited.

FIG. 2B is a cross-sectional view schematically showing the pedestal 5 formed by the manufacturing method of this embodiment. At least part of the surface 5a of the base 5 is formed in the curved surface shape of the main surface 4b itself of the glass plate 4 shown in FIG. 2A. The main surface 4b is a surface that contacts the surface 5a of the base 5. As shown in FIG. It is preferable that the entire surface 5a of the pedestal 5 is formed in the curved surface shape of the main surface 4b of the glass plate 4 itself. A specific example of the method for manufacturing the pedestal 5 will be described later.

In FIG. 2C, at least part of the glass plate 4 shown in FIG. 2A is fixed in close contact with the surface 5a of the pedestal 5 shown in FIG. 2B. It is preferable to fix the entire glass plate 4 to the surface 5 a of the base 5 . Although the fixing method is not limited, it is preferable to adsorb and fix the glass plate 4 to the pedestal 5 by negative pressure.

In the present embodiment, the main surface 4b of the glass plate 4 can be brought into contact with the surface 5a of the base 5 in the stage prior to fixing the glass plate 4 to the surface 5a of the base 5. There can be no gap in between, or the gap can be very small.
In the present embodiment, the "curved shape of the main surface 4b itself of the glass plate 4" and the "substantially the same shape as the main surface" mean that the shape error between the main surface 4a of the glass plate 4 and the surface 5a of the pedestal 5 is It refers to a curved shape that is 1.0 mm or less. Therefore, the gap between the glass plate 4 and the pedestal 5 can be made 1.0 mm or less, and the internal stress generated in the glass plate 4 when the glass plate 4 is fixed to the pedestal 5 can be reduced. The shape error is preferably 0.5 mm or less, more preferably 0.3 mm or less.
Note that the "shape error" is the maximum gap between the surface 5a of the pedestal 5 and the main surface 4b of the glass plate 4 facing the pedestal 5 when the glass plate 4 is arranged on the surface 5a of the pedestal 5. Point to value.

Although not shown, an elastic sheet may be attached to the surface 5a of the base 5. As a result, the elastic sheet can absorb part of the external force when the glass plate 4 is fixed to the surface 5a of the base 5, and the internal stress generated in the glass plate 4 can be reduced more effectively. In addition, although not limited, the absorption thickness of the elastic sheet is preferably about 0.2 mm.

As shown in FIG. 2C, while the glass plate 4 is fixed to the surface 5a of the pedestal 5, the glass plate 4 is processed in a predetermined manner. Although the "predetermined processing" is not limited, for example, cutting the edge of the glass plate 4 described in FIG. do. Alternatively, shape processing such as forming a through hole in the glass plate 4 can be proposed. In addition to shape processing, additional processing such as printing and coating can be applied. In this embodiment, when the glass plate 4 is fixed to the surface 5a of the pedestal 5, the internal stress generated in the glass plate 4 can be reduced. can be suppressed.

The material of the glass plate 4 is not limited in this embodiment. That is, alkali-free glass and alkali glass can be used without distinction. The glass plate 4 is, for example, soda-lime glass, alkali-free glass, alkali glass, or the like. The alkali glass may be glass for chemical strengthening. Glass for chemical strengthening is used, for example, as a cover glass after being chemically strengthened. The glass plate 4 may be air-cooled tempered glass. In this embodiment, even if the glass plate 4 is alkali glass, it can be appropriately processed into a predetermined shape while suppressing the development of microcracks.

Although the thickness of the glass plate 4 is not particularly limited, it is usually preferably 5 mm or less, more preferably 3 mm or less, in order to effectively perform the chemical strengthening treatment. Further, when the glass plate 4 is used as a cover glass for an in-vehicle display device such as a car navigation system, the thickness of the glass plate 4 is preferably 0.2 mm or more, more preferably 0.8 mm or more, more preferably 1 mm or more, from the viewpoint of strength. The above is more preferable.

In addition, the dimensions of the glass plate 4 can be appropriately selected according to the application. For example, when the glass plate 4 is used as a cover glass for an in-vehicle display device, the length of the short side is, for example, 50 mm or more and 500 mm or less, which is preferable. is 100 mm or more and 300 mm or less, and the length of the long side is, for example, 50 mm or more and 1500 mm or less, preferably 100 mm or more and 1200 mm or less. In this embodiment, even a glass plate having a relatively large size as described above can be processed appropriately.

3A to 3C are schematic diagrams showing an example of a shape processing process for the glass plate 4 fixed to the surface 5a of the pedestal 5. FIG.

As shown in FIG. 3A, the pedestal 5 is provided with grooves 7 extending in the thickness direction from the surface 5a at positions inside the end surfaces 5b, 5b. This groove 7 is formed with a length that crosses the edge of the glass plate 4 . Then, while the glass plate 4 is fixed to the surface 5 a of the base 5 , both ends of the glass plate 4 are cut by, for example, a laser beam L along the grooves 7 provided in the base 5 .
Next, as shown in FIG. 3B, the end surface 4c of the cut glass plate 4 is chamfered using a ball grindstone 8, for example.

FIG. 3C is a perspective view of the vicinity of the edge of the glass plate 4 showing chamfering by the ball grindstone 8. FIG. As shown in FIG. 3C, for example, the corner of the upper side between the main surface 4a on the upper surface side and the end surface 4c is chamfered with a ball grindstone 8, and then the main surface 4b on the lower surface side and the end surface 4c are chamfered. The corners of the lower side between are chamfered with a ball grindstone 8. As shown in FIG. Although the main surfaces 4a and 4b are shown as planes in FIG. 3C, they are actually curved surfaces.
Through the above steps, a glass substrate processed into a predetermined shape can be manufactured.

In this embodiment, when the glass plate 4 is fixed to the surface 5a of the pedestal 5, the internal stress generated in the glass plate 4 by fixing can be reduced. Therefore, shape processing such as internal processing of the glass plate 4 using the laser beam shown in FIGS. 3A and 3B and chamfering of the end face of the glass plate 4 using the grindstone shown in FIG. 3C can be performed easily and accurately. be able to.

In particular, the method for manufacturing a glass substrate according to the present embodiment is a glass having principal surfaces 4a and 4b which have curvature radii around two or more tangential axes intersecting at an arbitrary point on the principal surface 4a and which cannot be developed on a plane. It can be preferably applied to the plate 4. A specific example of a complicated shape that cannot be developed on a plane will be described in detail in the section [Description of a glass substrate according to an embodiment of the present invention] below. As described above, when the main surfaces 4a and 4b have a complicated shape, if a gap occurs between the glass plate 4 and the base 5, it is difficult to fill the gap even if an external force is applied. It is easy to cause a gap between 5 and the like. If shape processing such as cutting or drilling is performed in a state in which such a deviation has occurred, shape processing cannot be performed with high accuracy. Further, when the glass plate 4 is brought into close contact with the surface 5a of the base 5 by increasing the external force, the internal stress generated in the glass plate 4 becomes stronger, causing defects such as the development of microcracks. Therefore, when the main surface 4a of the glass plate 4 has a complicated shape, the glass plate 4 is fixed in close contact with the surface 5a of the pedestal 5, and the internal stress generated by the fixation is reduced. It becomes possible to apply highly accurate shape processing to.

<Cuttable Internal Stress Test for Glass Substrate>
A cuttable internal stress test was performed when the main surface 4a of the glass plate 4 was cut with a cutter and laser cut.

FIG. 4A is a schematic diagram showing a cuttable internal stress confirmation test when compressive stress is applied to the surface of the glass plate 13 for cutting with a cutter. FIG. 4B is a schematic diagram showing a cuttable internal stress confirmation test when tensile stress is applied to the surface of the glass plate 13 for cutting with a cutter.

Both ends of the lower surface of the flat glass plate 13 were supported by fixing members 9, and a strain gauge 10 was installed in the center of the lower surface of the glass plate 13. Then, as shown in FIG. 4A, on the upper surface side of the glass plate 13, a weight 11 was installed at a position inside the fixing member 9 to apply an external force downward to the glass plate 13. As shown in FIG. Thereby, a compressive stress can be applied to the upper surface of the glass plate 13 on the cutting side. Then, the cutter 12 cut the glass plate 13 along the center of the upper surface of the glass plate 13 while changing the magnitude of the external force. The internal stress generated in the glass plate 13 can be obtained based on the output of the strain gauge 10. FIG. However, the installation of the strain gauge 10 is not essential, and it is possible to obtain the internal stress from the force applied to the glass plate 13 and the cross-sectional area.

The center of the lower surface of the flat glass plate 13 is supported by a pin-shaped fixing member 9, and as shown in FIG. rice field. Thereby, a compressive stress can be applied to the upper surface of the glass plate 13 on the cutting side. Then, the cutter 12 cut the glass plate 13 along the center of the upper surface of the glass plate 13 while changing the magnitude of the external force.

FIG. 5A is a schematic diagram showing a cuttable internal stress confirmation test when applying a compressive stress to the surface of the glass plate 15 for laser cutting. FIG. 5B is a schematic diagram showing a cuttable internal stress confirmation test when applying tensile stress to the surface of the glass plate 15 for laser cutting.

The top view of FIG. 5A is a plan view, and the bottom view of FIG. 5A is a cross-sectional view. A jig 24 having a concavely curved surface 24 a was prepared, and a flat glass plate 15 was placed on the surface 24 a of the jig 24 . An external force was applied to the glass plate 15 by a weight (not shown) to follow the surface 24a of the jig 24 as shown in FIG. 5A. As a result, a compressive stress was applied to the upper surface of the glass plate 15 on the cutting side. In the experiment, while changing the radius of curvature of the concave curved surface of the jig 24, the glass plate 15 was cut by the laser beam 16 so as to vertically cut through the center of the upper surface thereof.

The top view of FIG. 5B is a plan view, and the bottom view is a cross-sectional view. A jig 17 having a convex curved surface 17 a was prepared, and a flat glass plate 18 was placed on the surface 17 a of the jig 17 . An external force was applied to the glass plate 18 by a weight (not shown) to follow the surface 17a of the jig 17 as shown in FIG. 5B. As a result, a tensile stress was applied to the upper surface of the glass plate 18 on the cutting side. In the experiment, while changing the radius of curvature of the convex curved surface of the jig 17, the glass plate 18 was cut by the laser beam 16 so as to vertically cut through the center of the upper surface thereof.
Table 1 below summarizes the upper limit values of the internal stress that can be processed, which are obtained from the above experiments.

Here, the values of the internal stress shown in Table 1 are the limit values at which defects such as microcrack progress and chipping are not observed on the cut surface of the glass substrate subjected to the predetermined shape processing.

As shown in Table 1, the upper limit of workability was 2 MPa when cutting with a cutter while compressive stress was applied to the surface of the cut side of the glass plate. Further, when the glass plate was cut with a cutter while tensile stress was acting on the surface of the glass plate, the upper limit of workability was 3 MPa. In addition, when laser cutting was performed with compressive stress acting on the surface of the glass plate, the upper limit of workability was 18 MPa. Further, when laser cutting was performed in a state in which tensile stress was applied to the surface of the glass plate, the upper limit of workability was 10 MPa.

[Method for producing glass substrate according to one embodiment of the present invention based on internal stress test]
In this embodiment, as shown in FIG. 2C, at least a portion of a glass plate 4 having main surfaces 4a and 4b having curved surfaces with a plurality of radii of curvature is placed on a pedestal 5 having a curved surface shape along the main surface 4b. When fixed to the surface 5a of the glass plate 4, the internal stress generated in the glass plate 4 is 10 MPa or less. Then, in a state where the glass plate 4 is fixed to the surface 5a of the pedestal 5, predetermined processing is performed. Here, laser cutting can be selected as the "predetermined processing". That is, by adjusting the internal stress generated in the glass plate 4 to 10 MPa or less when the glass plate 4 is subjected to laser cutting, it is possible to suppress the development of microcracks and the occurrence of defects such as chipping during shape processing. Internal stress can be measured using, for example, a digital image correlation method.

Further, in this embodiment, it is preferable to fix the glass plate 4 so that the internal stress generated in it is 2 MPa or less. As a result, cutter cutting can be selected as the "predetermined processing". That is, by adjusting the internal stress to 2 MPa or less, cutting can be performed regardless of laser cutting or cutter cutting. By adjusting the internal stress to 2 MPa or less in this way, it is possible to suppress the development of microcracks and the occurrence of defects such as chipping that occur during shape processing regardless of the type of cutting.

The pedestal 5 used in the method for manufacturing a glass substrate of the present embodiment is preferably a pedestal 5 manufactured by the method described below, but is not limited to a pedestal manufactured by the following manufacturing method. . The method of manufacturing the pedestal 5 is not limited as long as the pedestal 5 can keep the internal stress generated in the glass plate 4 within the above numerical range when the glass plate 4 is fixed to the pedestal 5 .

[Method for manufacturing a pedestal according to an embodiment of the present invention]
In this embodiment, the glass plate has a main surface having a curved surface with a plurality of radii of curvature, and at least part of the surface of the base has the curved shape of the main surface itself. More preferably, the entire surface of the pedestal is modeled after the curved shape of the main surface itself. The following method can be given as an example of the method of modeling the surface of the base in the shape of the main surface of the glass plate.

6A and 6B are cross-sectional views for explaining the method of manufacturing the pedestal 5 according to this embodiment. In FIG. 6A, a glass plate 4 is formed in which the main surfaces 4a, 4b are curved with multiple radii of curvature. FIG. 6A is a cross-sectional view schematically showing the glass plate 4. FIG. Then, at least the main surface 4 b of the glass plate 4 facing the base 5 is measured by the 3D scanner 19 . An existing product can be used for the 3D scanner 19 .

In FIG. 6B, based on the shape data acquired from the 3D scanner 19, at least part of the surface 5a of the base 5 is formed into a curved shape having, for example, multiple radii of curvature. It is preferable to form the entire surface 5a of the pedestal 5 in the curved shape based on the shape data. FIG. 6B is a cross-sectional view schematically showing the pedestal 5. As shown in FIG. By forming the pedestal 5 using a 3D printer, it is possible to manufacture the pedestal 5 that accurately reproduces the curved surface shape of the main surface 4a of the glass plate 4 .
Although the material of the pedestal 5 manufactured by the method described using FIGS. 6A and 6B is not limited, for example, thermoplastic resin can be presented.

7A to 7C are cross-sectional views for explaining a method of manufacturing a pedestal according to another embodiment than FIGS. 6A and 6B. For example, a tabular thermoplastic resin 14 having a predetermined thickness is prepared. In this case, the surface 14a of the thermoplastic resin 14 is planar. The thermoplastic resin 14 is softened by heating. For the thermoplastic resin, for example, "Hapra Freele" manufactured by Polysys Co., Ltd. can be used.

As shown in FIG. 7B, a glass plate 4 having curved main surfaces 4a and 4b with a plurality of radii of curvature is pressed against a surface 14a of a softened thermoplastic resin 14 heated to a softening point or higher. Then, while the glass plate 4 is being pressed against it, it is cooled to the curing temperature to cure the thermoplastic resin 14 . Thereafter, as shown in FIG. 7C, the glass plate 4 is removed from the surface 14a of the hardened thermoplastic resin 14. Then, as shown in FIG. Thereby, the pedestal 5 whose surface 5a has the same curved surface shape as the main surface 4b of the glass plate 4 can be precisely formed.

6A, 6B, and 7A to 7C, the surface 5a of the pedestal 5 is formed using the curved shape of the main surface itself of the molded glass plate 4. . Therefore, the curved shape of the main surface 4a of the glass plate 4 can be transferred to the surface 5a of the base 5 with high accuracy.

[Method for manufacturing a glass substrate using a pedestal manufactured by the method of one embodiment of the present invention]
The pedestal 5 manufactured by the method described using FIGS. 6A, 6B, and 7A to 7C has a surface 5a having a curved shape of the main surfaces 4a and 4b of the molded glass plate 4 itself. are doing. Therefore, as shown in FIG. 2C, when the glass plate 4 is placed on the surface 5a of the pedestal 5, no gap is generated between the main surface 4b of the glass plate 4 and the surface 5a of the pedestal 5, or the gap is formed. can be made very small. Therefore, when the glass plate 4 is fixed to the pedestal 5, the internal stress generated in the glass plate 4 can be suppressed to 10 MPa or less, preferably 2 MPa or less.

Therefore, in a state where the glass plate 4 is fixed to the pedestal 5 manufactured by the method described with reference to FIGS. When processed, it is possible to effectively suppress the development of microcracks and the occurrence of defects such as chipping that occur during shape processing.

In the method for manufacturing a glass substrate according to the present embodiment, the main surface 4a of the glass plate 4 is formed into a complex shape having a radius of curvature around two or more tangential axes that intersect at an arbitrary point on the main surface. It can be preferably applied.

That is, in the present embodiment, even if the main surfaces 4a and 4b of the glass plate 4 have a complicated shape, the internal stress generated in the glass plate 4 can be suppressed to 10 MPa or less when the glass plate 4 is fixed to the pedestal 5. preferably, it can be suppressed to 2 MPa or less. Alternatively, when the glass plate 4 is fixed to the pedestal 5, the main surface 4b of the glass plate 4 can be brought into contact with the surface 5a of the pedestal 5 without any gap. As a result, when the main surface 4a of the glass plate 4 is processed in a predetermined manner, it is possible to effectively suppress the development of microcracks and the occurrence of defects such as chipping that occur during shape processing.

[Description of the glass substrate of one embodiment of the present invention]
FIG. 8 is a perspective view of the glass substrate 20 of this embodiment. 9A is a plan view of the glass substrate 20 shown in FIG. 8, FIG. 9B is a front view of the glass substrate 20, and FIG. 9C is a side view of the glass substrate 20. FIG. FIG. 10 is a partially enlarged cross-sectional view showing the vicinity of the end surface of the glass substrate 20. As shown in FIG.

As shown in FIGS. 8 and 9B, the glass substrate 20 of this embodiment has a first main surface 20a on the upper surface side and a second main surface 20b on the lower surface side. 20b face each other in the thickness direction.
As shown in FIGS. 8, 9A and 9B, the opposing main surfaces 20a and 20b are connected by an end surface 20c.
Here, the two directions orthogonal to each other in the plane direction are the X direction and the Y direction, and the height direction orthogonal to the X direction and the Y direction is the Z direction.
Although not limited, the glass substrate 20 preferably has an elongated shape extending longer in the X direction than in the Y direction, as shown in FIGS. 8 and 9A.

As shown in FIGS. 8, 9B, and 9C, the glass substrate 20 is curved in the Z direction in the long direction extending in the X direction and curved in the Z direction in the short direction extending in the Y direction. preferably. In other words, as shown in FIGS. 8 and 9A, the first major surface 20a is a first plane parallel to the X direction perpendicular to the center point A as an arbitrary point on the first major surface 20a, for example. , and a second tangent line C parallel to the Y-direction, and have a shape that cannot be developed on a plane having radii of curvature around each axis.

The first radius of curvature around the axis of the first tangent line B is the radius of curvature of a curved surface that extends in the Y direction and curves in the Z direction in the short direction, and the second radius of curvature around the axis of the second tangent line C The radius is the radius of curvature of a curved surface that extends in the X direction and curves in the Z direction. The first radius of curvature is preferably smaller than the second radius of curvature. For example, the first curvature radius is 5 mm or more and 3000 mm or less, and the second curvature radius is 600 mm or more and 14000 mm or less.

As shown in FIGS. 8 and 9B, the principal surfaces 20a and 20b have bent portions 21 bent with a radius of curvature smaller than the second radius of curvature on both sides in the longitudinal direction. In this embodiment, the bent portions 21 on both sides are bent to the same side, but they may be bent in different directions.

As shown in FIG. 10, the glass substrate 20 of this embodiment has a principal surface having a curved surface with multiple radii of curvature. At least one end surface 20c connecting the opposing main surfaces has an edge surface 22 and a chamfered surface 23 positioned between the edge surface 22 and the main surfaces 20a and 20b. has a concave surface. The edge surface 22 is orthogonal to the main surfaces 20 a and 20 b or the surface of the bent portion 21 .

The edge surface 22 is, for example, a cut surface cut by the laser beam L shown in FIG. 3A, and the chamfered surface 23 of the present embodiment is, for example, a surface chamfered by the ball grindstone 8 shown in FIG. 3C. .

In this embodiment, the maximum height Sz of the surface roughness of the edge surface 22 and the chamfered surface 23 is not limited, but can be, for example, 10 μm or less.
The maximum height Sz of surface roughness is a value measured according to JIS B 0601:2001. A laser microscope (manufactured by Olympus Corporation: LEXT OLS5000), for example, can be used to measure the maximum height Sz of surface roughness. In this embodiment, the maximum height Sz of the chamfered surface 23 can be made smaller than the maximum height Sz of the edge surface 22 . Since the edge surface 22 is a surface cut by the laser beam L, the maximum height Sz can be 10 μm or less, preferably 8 μm or less, more preferably 7 μm or less. For example, the maximum height Sz of the edge surface 22 can be set to approximately 6 to 8 μm. In this embodiment, the maximum height Sz of the chamfered surface 23, which is the polishing surface of the ball grindstone 8, can be 5 μm or less.
On the other hand, FIG. 11A is a partially enlarged cross-sectional view of an edge face 30 of a conventional glass substrate, and FIG.

In FIG. 11A, the end surface 30 has an edge surface 30a and a chamfered surface 30b, and the chamfered surface 30b is a linearly inclined surface. The chamfered surface 30b is a so-called C-plane. As shown in FIG. 11B, the end surface 30 can be formed using a grindstone 31 that can be processed into the shape of the edge surface 30a and the chamfered surface 30b. In the conventional example shown in FIGS. 11A and 11B, both the chamfered surface 30b and the edge surface 30a of the end surface 30 are surfaces finished by the grindstone 31. In FIG. Therefore, the maximum height Sz from the edge surface 30a to the chamfered surface 30b is substantially the same.

Compared with the end surface 30 of the conventional example shown in FIG. 11A, the end surface 20c of the glass substrate 20 of the present embodiment has better visibility of the end surface, the processing load during chamfering can be reduced, and the processing work can be shortened. can. Furthermore, the variation width of the chamfer width T1 can be reduced.

That is, in the present embodiment, by making the chamfered surface 23 concave, the visibility of the end surface 20c can be improved compared to the C surface (chamfered surface 30b) shown in FIG. 11A. Further, in the present embodiment, the ball grindstone 8 chamfers only the corners between the main surfaces 20a, 20b and the end surface 20c. Therefore, the edge surface 22 is left as a cut surface, and the processing load can be reduced compared to the conventional example in which the entire end surface is processed with a grindstone, and the working time can be shortened. In addition, the variation width of the chamfer width T1 can be reduced, and the variation width of the chamfer width T1 on at least one end face can be suppressed to 20 μm or less. In the present embodiment, it is preferable that the chamfered width T1 of the chamfered surface 23 on all the end faces has a variation width of 20 μm or less.

The glass substrate 20 in this embodiment can be formed through the steps described with reference to FIGS. 2A to 2C and FIGS. 3A to 3C. In this embodiment, the glass plate 4 can be fixed in close contact with the surface of the pedestal 5 during shape processing. In particular, when the glass plate 4 is fixed to the surface of the pedestal 5, the internal stress generated in the glass plate 4 can be suppressed to 10 MPa or less. As a result, the laser cutting shown in FIG. 3A and the chamfering by the ball grindstone 8 shown in FIGS. 3B and 3C can be performed with high accuracy, and the end surface shape shown in FIG. 10 can be formed with high accuracy and small variations.

In FIG. 8, the end face 20c located at the end of the glass substrate 20 in the X direction was used for explanation, but the end faces 20d located on both sides in the Y direction are also chamfered concavely with the edge face 22 shown in FIG. 23. All the end faces 20c and 20d may be formed with the end face shape shown in FIG. 10, or at least one end face may be formed with the end face shape shown in FIG.

Further, the curved surface shape of the main surfaces 20a and 20b of the glass substrate 20 of the present embodiment is not limited to the shape shown in FIG. A glass substrate made of a curved glass plate 4 may be used. However, in the present embodiment, as shown in FIGS. 8 and 9A, the first main surface 20a is aligned with the first tangent line B parallel to the X direction perpendicular to the central point A on the first main surface 20a. , and the second tangent line C parallel to the Y direction, and have a shape that cannot be developed on a plane with a radius of curvature around each axis. In particular, the glass plate 4 having the main surfaces 4a and 4b having a complicated shape that cannot be developed on a plane is closely attached and fixed to the pedestal 5 and subjected to shape processing, as shown in FIG. 2C. As a result, the internal stress generated by the fixation can be reduced, and it is possible to perform highly accurate shape processing on complex shapes.

As described above, according to the present embodiment, it is possible to obtain the glass substrate 20 in which the development of microcracks and defects such as chipping are suppressed in the end faces 20c, 20d, etc., which are the shaped surfaces.

The glass substrate 20 of the present embodiment can be applied to, for example, automobile instrument panels, automobile windows, cover glasses of touch panel displays of tablets, notebook PCs, smartphones, etc., and cover glasses of PC monitors, etc. Among these, the glass substrate 20 of the present embodiment is particularly suitable as a glass substrate for an in-vehicle display.

[Description of the pedestal of one embodiment of the present invention]
The pedestal 5 of the present embodiment is a pedestal 5 for fixing the glass plate 4, and at least part of the surface 5a of the pedestal 5 is a curved surface of the main surface itself having a curved surface having a plurality of radii of curvature of the glass plate 4. have a shape. For example, the pedestal 5 can be manufactured by the manufacturing method described with reference to FIGS. 6A, 6B, and 7A to 7C. At least part of the surface 5a of the pedestal 5 formed by these manufacturing methods has the shape of the main surface 4b of the glass plate 4 itself. In addition, it is preferable that the entire surface 5a is formed in the shape of the main surface 4b of the glass plate 4 itself. Thereby, as shown in FIG. 2C, when the glass plate 4 is fixed to the surface 5a of the base 5, the glass plate 4 and the base 5 can be brought into close contact with each other. Therefore, in this embodiment, the internal stress generated in the glass plate 4 can be effectively reduced when fixing the glass plate 4. Specifically, the internal stress generated in the glass plate 4 is 10 MPa or less, preferably 2 MPa. can be reduced to the following. Therefore, when the main surfaces 4a and 4b of the glass plate 4 are subjected to a predetermined processing while the glass plate 4 is fixed to the base 5, the development of microcracks and the occurrence of defects such as chipping during shape processing can be effectively prevented. can be suppressed.

Moreover, the base 5 of the present embodiment has a complex shape in which at least a portion of the surface 5a of the base 5 has curvature radii around two or more tangential axes that intersect at an arbitrary point on the surface 5a. The entire surface 5a preferably has the complex shape. For example, the complex shape on the surface 5a of the base 5 has tangential directions parallel to the mutually orthogonal X and Y directions, as shown in FIG. 9A. This pedestal 5 is a pedestal used for manufacturing the glass substrate 20 shown in FIG. Thereby, when the glass plate 4 is fixed to the surface 5a of the base 5, the glass plate 4 can be brought into close contact with the base 5 appropriately. Therefore, the internal stress generated in the glass plate 4 can be appropriately suppressed. As described above, by using the pedestal 5 of the present embodiment, it is possible to effectively suppress the development of microcracks and the occurrence of defects such as chipping that occur during shape processing of the glass plate 4 having the main surfaces 4a and 4b having a complicated shape. .
The features of the above embodiment are summarized below.

One aspect of the present embodiment is a glass plate 4 having principal surfaces 4a and 4b having curved surfaces with a plurality of radii of curvature. A method for manufacturing a glass substrate is provided, in which at least a part of the glass plate is fixed to the surface 5a of 5 and subjected to a predetermined processing. In addition, it is preferable that the entire surface 5a of the base 5 has a curved surface shape of the main surface of the glass plate 4 itself. According to this configuration, especially when the main surface of the glass plate 4 is laser-cut, it is possible to effectively suppress the development of microcracks and the occurrence of defects such as chipping.

Further, according to the method for manufacturing a glass substrate of the present embodiment, the glass plate 4 having the main surfaces 4a and 4b having curved surfaces with a plurality of radii of curvature is formed on the surface of the pedestal 5 by at least a portion of the glass plate 4. 5a, the internal stress generated in the glass plate 4 by the fixation is 10 MPa or less, and the glass plate 4 is subjected to a predetermined processing while the glass plate 4 is fixed to the surface 5a of the pedestal 5. to provide a method for manufacturing a glass substrate. In this embodiment, it is preferable to fix the glass plate 4 so that the internal stress generated in the glass plate 4 is 2 MPa or less. In this way, when the glass plate 4 is fixed to the base 5, the internal stress generated in the glass plate 4 can be extremely reduced. can be effectively suppressed. In particular, when the main surfaces 4a and 4b of the glass plate 4 are laser-cut or cut with a cutter while the glass plate 4 is fixed to the pedestal 5, the development of microcracks and the occurrence of defects such as chipping can be effectively suppressed.

Further, one aspect of the present embodiment is a method for manufacturing a pedestal 5 for fixing a glass plate 4, wherein the glass plate 4 has main surfaces 4a and 4b having curved surfaces having a plurality of radii of curvature. A method for manufacturing a pedestal is provided in which at least a portion of the surface 5a of the pedestal 5 is shaped to substantially the same shape as at least a portion of the curved shape of the main surface itself. It is preferable that the entire surface 5a of the pedestal 5 is modeled after the curved shape of the main surface itself.

Further, one aspect of the present embodiment is a method for manufacturing a pedestal 5 for fixing a glass plate 4, wherein the glass plate 4 has main surfaces 4a and 4b having curved surfaces having a plurality of radii of curvature. A method for manufacturing a pedestal is provided in which the main surfaces 4a and 4b of the pedestal are measured by a 3D scanner 19 and at least a part of the surface 5a of the pedestal 5 is formed based on the obtained shape data. It is preferable to form the entire surface 5a of the base 5 based on the acquired shape data.

Further, one aspect of the present embodiment is a method for manufacturing a pedestal 5 for fixing a glass plate 4, wherein the glass plate 4 has main surfaces 4a and 4b having curved surfaces having a plurality of radii of curvature. The pedestal 5 contains a thermoplastic resin, and at least part of the main surface of the glass plate 4 is pressed against the surface of the thermoplastic resin in a softened state to harden the thermoplastic resin. provide a way. It is preferable to press the entire surface 5a of the pedestal 5 against the glass plate 4 to form it.

According to these methods for manufacturing the pedestal 5, the pedestal 5 having the surface 5a following the curved shape of the main surface of the glass plate 4 can be manufactured with high precision. Moreover, even if the main surfaces 4a and 4b of the glass plate 4 have a complicated shape that cannot be expanded on a plane, the base 5 having the surface 5a similarly having a complicated shape can be formed easily and accurately.

Further, in one aspect of the present embodiment, at least a part of the glass plate 4 is fixed to the surface 5a of the base 5 formed by the manufacturing method described above, and the main surfaces 4a and 4b of the glass plate 4 are provided with predetermined to provide a method for manufacturing a glass substrate. According to this configuration, the curved surface shape of the surface 5a of the pedestal 5 follows the curved surface shape of the main surface of the glass plate 4. Therefore, when the glass plate 4 is placed on the surface 5a of the pedestal 5, the glass plate 4 and the pedestal are separated from each other. 5, or the gap can be made extremely small. Therefore, when the glass plate 4 is fixed to the surface 5a of the pedestal 5, the internal stress generated in the glass plate 4 can be suppressed, and the development of microcracks and the occurrence of defects such as chipping that occur during shape processing of the glass plate 4. can be effectively suppressed.
Further, in the method for manufacturing a glass substrate of the present embodiment, alkali glass can be used for the glass plate 4 .

Further, in the method for manufacturing a glass substrate of the present embodiment, the main surface of the glass plate 4 cannot be developed into a plane having a radius of curvature around two or more tangential axes that intersect at an arbitrary point on the main surface. A method for manufacturing a glass substrate having a shape can be provided. At this time, for example, the first curvature radius can be 5 mm or more and 3000 mm or less, and the second curvature radius can be 600 mm or more and 14000 mm or less. In the present embodiment, even if the main surface has a complicated shape that cannot be developed on a plane, when the glass plate 4 is placed on the surface of the pedestal 5, no gap is generated between the glass plate 4 and the pedestal 5, or a gap is formed. can be made extremely small. Therefore, when the glass plate 4 is fixed to the surface 5a of the pedestal 5, the internal stress generated in the glass plate 4 can be suppressed, and defects such as microcrack development and chipping that occur during shape processing of the glass plate 4 can occur. can be effectively suppressed.

In addition, in the method of manufacturing a glass substrate according to the present embodiment, it is preferable that the glass plate 4 is fixed to the surface 5a of the pedestal 5 by suction under negative pressure. In this embodiment, there is no gap between the glass plate 4 and the pedestal 5, or the gap can be made extremely small, so that suction and fixation by negative pressure can be performed reliably and easily.

Further, in the method for manufacturing a glass substrate of the present embodiment, it is preferable that the shape error between the main surface shape of the glass plate 4 and the surface shape of the pedestal 5 is 1.0 mm or less. More preferably, the shape error is 0.3 mm or less. Thus, in this embodiment, the shape error between the glass plate 4 and the pedestal 5 can be reduced, so that the gap generated when the glass plate 4 is fixed to the pedestal 5 can be made very small. Therefore, the internal stress generated in the glass plate 4 when the glass plate 4 is fixed can be reduced, and the development of microcracks and defects such as chipping that occur when the glass plate 4 is shaped can be effectively suppressed.

Further, in the method for manufacturing a glass substrate of the present embodiment, internal processing of the glass plate using laser light can be exemplified as the predetermined processing. Further, as the predetermined processing, chamfering processing of the end surface of the glass plate using a grindstone can be exemplified. Through these processing steps, the shape of the end face of the glass substrate of the present embodiment can be formed with high accuracy and small variations.

In addition, one aspect of the present embodiment is provided with main surfaces 20a and 20b having curved surfaces having a plurality of radii of curvature, and at least one end surface 20c and 20d connecting the opposing main surfaces is an edge surface 22 and a chamfered surface 23 located between the edge surface and each principal surface, the chamfered surface 23 having a concave surface. As a result, the visibility of the end face can be improved, the processing load during chamfering can be reduced, and the processing work can be shortened. Furthermore, the variation width of the chamfer width T1 can be reduced.

Further, in the present embodiment, the maximum height Sz of the surface roughness of the edge surface 22 and the chamfered surface 23 is preferably 10 μm or less. Further, in the present embodiment, the variation width of the chamfered width T1 of the chamfered surface 23 on at least one of the end faces can be set to 20 μm or less. In this manner, the maximum height Sz of the edge surface 22 and the chamfered surface 23 can be reduced, variation in the chamfered shape can be reduced, and the end surface shape can be formed with high accuracy.

In addition, in the glass substrate of the present embodiment, the main surface 20a of the glass substrate 20 has a shape that cannot be expanded on a plane and has a radius of curvature around two or more tangential axes that intersect at an arbitrary point on the main surface. It is preferable to have As described above, in the present embodiment, the main surface of the glass substrate 20 can be formed to have a complicated shape that cannot be developed on a plane, and the internal stress generated by fixing to the pedestal during shape processing can be reduced. It is possible to effectively suppress the development of cracks and the occurrence of defects such as chipping.
Moreover, the glass substrate 20 of this embodiment can be preferably used for an in-vehicle display, for example.

Further, one aspect of the present embodiment is a pedestal 5 for fixing the glass plate 4, the glass plate has a main surface having a curved surface having a plurality of radii of curvature, and the surface 5a of the pedestal 5 at least part of which has a curved surface shape of the main surface itself of the glass plate. It is preferable that the entire surface 5a of the pedestal 5 is formed in the curved shape of the main surface of the glass plate 4 itself. According to this configuration, when the glass plate 4 is installed on the surface 5 a of the base 5 , the glass plate 4 and the base 5 can be appropriately brought into contact with each other. Thereby, when the glass plate 4 is fixed to the pedestal 5, the internal stress generated in the glass plate 4 can be suppressed to 10 MPa or less, preferably 2 MPa or less. Therefore, when the glass plate 4 is fixed to the base 5 and the main surface of the glass plate 4 is subjected to a predetermined processing, it is possible to effectively suppress the development of microcracks and the occurrence of defects such as chipping that occur during shape processing.

Further, one aspect of the present embodiment is a pedestal 5 for fixing the glass plate 4, wherein at least part of the surface 5a of the pedestal 5 is two tangential axes that intersect at any point on the surface. Provided is a pedestal having a shape that cannot be developed on a plane and has a radius of curvature around the above axis. In this embodiment, it is preferable that the entire surface 5a of the pedestal 5 has a shape that cannot be developed on a plane. According to this configuration, even if at least a part of the surface 5a has a complicated shape that cannot be developed on a plane, when the glass plate 4 is placed on the surface 5a of the pedestal 5, a gap is formed between the glass plate 4 and the pedestal 5. or the gap can be made extremely small. Therefore, when the glass plate 4 is fixed to the surface of the pedestal 5, the internal stress generated in the glass plate 4 can be suppressed, and the development of microcracks and the occurrence of defects such as chipping that occur during shape processing of the glass plate 4 can be suppressed. can be effectively suppressed.

As explained above, the following configurations are disclosed in this specification.
[1] A method for manufacturing a glass substrate, wherein at least part of a glass plate having a main surface having a curved surface with a plurality of radii of curvature is fixed to the surface of a pedestal, and the glass plate is subjected to a predetermined process. ,
The method for producing a glass substrate, wherein the surface of the base has substantially the same shape as at least part of the curved shape of the main surface itself of the glass plate.
[2] At least a portion of a glass plate having a main surface having a curved surface with multiple radii of curvature is brought into close contact with and fixed to the surface of the pedestal;
The internal stress generated in the glass plate by the fixation is 10 MPa or less,
A method of manufacturing a glass substrate, wherein the glass plate is fixed to the surface of the pedestal and then subjected to a predetermined process.
[3] A method for manufacturing a pedestal for fixing a glass plate, comprising:
The glass plate has a main surface having a curved surface with a plurality of radii of curvature,
A method of manufacturing a pedestal, wherein at least part of the surface of the pedestal is modeled to have substantially the same shape as at least part of the curved shape of the main surface itself of the glass plate.
[4] A method for manufacturing a pedestal for fixing a glass plate, comprising:
The glass plate has a main surface having a curved surface with a plurality of radii of curvature,
A method of manufacturing a pedestal, comprising measuring the main surface with a 3D scanner and forming at least a part of the surface of the pedestal based on the acquired shape data.
[5] A method for manufacturing a pedestal for fixing a glass plate, comprising:
The glass plate has a main surface having a curved surface with a plurality of radii of curvature,
The pedestal includes a thermoplastic resin,
A method of manufacturing a pedestal, wherein at least part of the main surface is pressed against a surface of the thermoplastic resin in a softened state to harden the thermoplastic resin.
[6] At least part of the glass plate is fixed to the surface of the pedestal formed by the method for manufacturing a pedestal according to any one of [3] to [5],
A method for manufacturing a glass substrate, wherein the main surface of the glass plate is subjected to a predetermined process.
[7] The method for producing a glass substrate according to [1], [2], or [6], wherein the glass plate is alkali glass.
[8] The main surface of the glass plate has a shape that cannot be developed on a plane and has a radius of curvature around two or more tangential axes that intersect at an arbitrary point on the main surface, [1], [2]. , [6], or the method for manufacturing a glass substrate according to [7].
[9] The method for producing a glass substrate according to [8], wherein the first radius of curvature is 5 mm or more and 3000 mm or less, and the second radius of curvature is 600 mm or more and 14000 mm or less.
[10] The method for manufacturing a glass substrate according to any one of [1], [2], and [6] to [9], wherein the glass plate is fixed to the surface of the pedestal by suction with negative pressure.
[11] Any one of [1], [2], and [6] to [10], wherein the shape error between the main surface shape of the glass plate and the surface shape of the pedestal is 1.0 mm or less. The method for producing a glass substrate according to .
[12] The glass substrate according to any one of [1], [2], and [6] to [11], wherein the predetermined processing includes internal processing of the glass plate using a laser beam. manufacturing method.
[13] Any one of [1], [2], and [6] to [12], wherein the predetermined processing includes chamfering the end surface of the glass plate using a grindstone, A method for manufacturing a glass substrate.
[14] comprising a principal surface having a curved surface with a plurality of radii of curvature;
glass, wherein at least one end surface connecting the opposing main surfaces has an edge surface and a chamfered surface positioned between the edge surface and each of the main surfaces, the chamfered surface having a concave surface; substrate.
[15] The glass substrate according to [14], wherein the maximum height Sz of the surface roughness of the edge surface and the chamfered surface is 10 µm or less.
[16] The glass substrate according to [14] or [15], wherein the chamfered width of the chamfered surface on at least one of the end surfaces has a variation width of 20 μm or less.
[17] The main surface of the glass substrate has a shape that cannot be developed on a plane and has a radius of curvature around two or more tangential axes that intersect at an arbitrary point on the main surface, [14] to [16]. The glass substrate according to any one of.
[18] The glass substrate according to any one of [14] to [17], which is for an in-vehicle display.
[19] A pedestal for fixing a glass plate,
The glass plate has a main surface having a curved surface with a plurality of radii of curvature,
A pedestal, wherein at least part of the surface of the pedestal has a curved surface shape of the main surface itself.
[20] A pedestal for fixing a glass plate,
A pedestal, wherein at least a part of the surface of the pedestal has a shape that cannot be developed on a plane and has radii of curvature about two or more tangential axes that intersect at an arbitrary point on the surface.

The effects of the present invention will be described below with reference to examples and comparative examples of the present invention. In addition, the present invention is not limited at all by the following examples.

In the experiment, as Example 1, a glass plate 35 whose main surface has a curved shape that cannot be developed on a plane was measured with a 3D scanner, and a pedestal 36 was produced based on the obtained shape data. A perspective view of the fabricated pedestal 36 is shown in FIG. 12A.

Further, Example 2 is the case where the surface of the pedestal is formed according to the design value of the glass plate. Example 1 is an example and Example 2 is a comparative example.
12B is a graph showing the height difference between the surface of the pedestal 36 in Example 1 and the surface of the pedestal in Example 2. FIG. As can be seen from the vertical scale on the right axis of FIG. 12B, the height difference between the surfaces of the pedestals of Examples 1 and 2 was about 0.7 mm at maximum. Thus, it was found that when the pedestal was manufactured based on the design values, the shape error with the molded glass plate increased. On the other hand, in Example 1, the shape error could be made very small.

Although the present invention 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 (Japanese Patent Application No. 2021-193950) filed on November 30, 2021, the content of which is hereby incorporated by reference.

1, 4, 13, 15, 18, 35: glass plate 1a: main surface 1b: main surface 2, 36: pedestal 2a: surface 3: gap 4: glass plates 4a, 4b: main surface 4c: end surface 5a: surface 7 : Groove 8 : Ball grindstone 12 : Cutter 14 : Thermoplastic resin 16 : Laser beam 19 : 3D scanner 20 : Glass substrate 20a : First main surface 20b : Second main surface 20c, 20d : End surface 21 : Bending portion 22 : Edge surface 23 : Chamfered surface A : Center point B : First tangent line C : Second tangent line L : Laser beam T1 : Chamfer width

Claims (20)

1. A method for manufacturing a glass substrate, comprising fixing at least part of a glass plate having a main surface having a curved surface with a plurality of radii of curvature to the surface of a pedestal, and subjecting the glass plate to a predetermined process,
   The method for producing a glass substrate, wherein the surface of the base has substantially the same shape as at least part of the curved shape of the main surface itself of the glass plate.
2. At least a portion of a glass plate having a main surface having a curved surface with multiple radii of curvature is brought into close contact with and fixed to the surface of the pedestal;
   The internal stress generated in the glass plate by the fixation is 10 MPa or less,
   A method of manufacturing a glass substrate, wherein the glass plate is fixed to the surface of the pedestal and then subjected to a predetermined process.
3. A method for manufacturing a pedestal for fixing a glass plate, comprising:
   The glass plate has a main surface having a curved surface with a plurality of radii of curvature,
   A method of manufacturing a pedestal, wherein at least part of the surface of the pedestal is modeled to have substantially the same shape as at least part of the curved shape of the main surface itself of the glass plate.
4. A method for manufacturing a pedestal for fixing a glass plate, comprising:
   The glass plate has a main surface having a curved surface with a plurality of radii of curvature,
   A method of manufacturing a pedestal, comprising measuring the main surface with a 3D scanner and forming at least a part of the surface of the pedestal based on the acquired shape data.
5. A method for manufacturing a pedestal for fixing a glass plate, comprising:
   The glass plate has a main surface having a curved surface with a plurality of radii of curvature,
   The pedestal includes a thermoplastic resin,
   A method of manufacturing a pedestal, wherein at least part of the main surface is pressed against a surface of the thermoplastic resin in a softened state to harden the thermoplastic resin.
6. At least part of the glass plate is fixed to the surface of the pedestal formed by the method for manufacturing the pedestal according to any one of claims 3 to 5,
   A method for manufacturing a glass substrate, wherein the main surface of the glass plate is subjected to a predetermined process.
7. The method for manufacturing a glass substrate according to claim 1 or claim 2, wherein the glass plate is alkali glass.
8. 3. The main surface of the glass plate according to claim 1 or 2, wherein the main surface has a shape that cannot be expanded on a plane and has curvature radii around two or more tangential axes that intersect at an arbitrary point on the main surface. , a method for manufacturing a glass substrate.
9. The method for manufacturing a glass substrate according to claim 8, wherein the first radius of curvature is 5 mm or more and 3000 mm or less, and the second radius of curvature is 600 mm or more and 14000 mm or less.
10. The method for manufacturing a glass substrate according to claim 1 or claim 2, wherein the glass plate is fixed by suction to the surface of the pedestal by means of negative pressure.
11. The method for manufacturing a glass substrate according to claim 1 or 2, wherein a shape error between the main surface shape of the glass plate and the surface shape of the pedestal is 1.0 mm or less.
12. The method for manufacturing a glass substrate according to claim 1 or claim 2, wherein the predetermined processing includes internal processing of the glass plate using laser light.
13. The method for manufacturing a glass substrate according to claim 1 or claim 2, wherein the predetermined processing includes chamfering the end surface of the glass plate using a grindstone.
14. comprising a principal surface having a curved surface with multiple radii of curvature;
    glass, wherein at least one end surface connecting the opposing main surfaces has an edge surface and a chamfered surface positioned between the edge surface and each of the main surfaces, the chamfered surface having a concave surface; substrate.
15. 15. The glass substrate according to claim 14, wherein the maximum height Sz of the surface roughness of the edge surface and the chamfered surface is 10 μm or less.
16. 16. The glass substrate according to claim 14 or 15, wherein the chamfered width of the chamfered surface on at least one of the end faces has a variation width of 20 μm or less.
17. 16. The main surface of the glass substrate according to claim 14 or 15, wherein the main surface has a shape that cannot be expanded on a plane and has curvature radii around two or more tangential axes that intersect at an arbitrary point on the main surface. glass substrate.
18. The glass substrate according to claim 14 or 15, which is for an in-vehicle display.
19. A pedestal for fixing a glass plate,
    The glass plate has a main surface having a curved surface with a plurality of radii of curvature,
    A pedestal, wherein at least part of the surface of the pedestal has a curved surface shape of the main surface itself.
20. A pedestal for fixing a glass plate,
    A pedestal, wherein at least part of the surface of the pedestal has a shape that cannot be developed on a plane and has radii of curvature about two or more tangential axes that intersect at an arbitrary point on the surface.

Images