WO2020040100A1 - Molding die for 3d cover glass and method for manufacturing 3d cover glass using same - Google Patents

Molding die for 3d cover glass and method for manufacturing 3d cover glass using same Download PDF

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Publication number
WO2020040100A1
WO2020040100A1 PCT/JP2019/032326 JP2019032326W WO2020040100A1 WO 2020040100 A1 WO2020040100 A1 WO 2020040100A1 JP 2019032326 W JP2019032326 W JP 2019032326W WO 2020040100 A1 WO2020040100 A1 WO 2020040100A1
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WO
WIPO (PCT)
Prior art keywords
cover glass
molding die
curved surface
mold
main
Prior art date
Application number
PCT/JP2019/032326
Other languages
French (fr)
Japanese (ja)
Inventor
諭 金杉
恭基 福士
Original Assignee
Agc株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Agc株式会社 filed Critical Agc株式会社
Priority to JP2020538384A priority Critical patent/JP7211424B2/en
Priority to CN201980055048.3A priority patent/CN112585097B/en
Publication of WO2020040100A1 publication Critical patent/WO2020040100A1/en

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    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/06Construction of plunger or mould
    • C03B11/08Construction of plunger or mould for making solid articles, e.g. lenses
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00Re-forming shaped glass
    • C03B23/02Re-forming glass sheets
    • C03B23/023Re-forming glass sheets by bending
    • C03B23/035Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending

Definitions

  • the present invention relates to a cover glass (3D cover glass) having a three-dimensional shape for an image display device used for a mobile device such as a mobile phone, a smartphone, a tablet terminal, or a vehicle-mounted display such as a CID (Center Information Display) or a cluster.
  • the present invention relates to a molding die and a method for producing a 3D cover glass using the molding die.
  • FIG. 1 is a perspective view showing a conventional 3D cover glass.
  • the 3D cover glass 300 shown in FIG. 1 has a flat central portion 310 and a curved portion 320 having a three-dimensional curved shape around the central portion 310.
  • a curved surface portion of a 3D cover glass indicates a curved surface portion having a three-dimensional curved surface shape.
  • Patent Document 1 discloses a method of forming a so-called 3D cover glass having a curved end as a cover glass of an information terminal such as a smartphone.
  • Patent Literature 1 discloses a mold designed for a 3D cover glass, and a desired 3D cover glass is realized by a molding method in which a hole is provided in a part of the mold and a vacuum is drawn.
  • FIG. 2 is a perspective view showing one configuration example of the 3D cover glass.
  • the 3D cover glass 100 shown in FIG. 2 has a flat central part 110 and a curved part 120 around the central part 110 with a bending angle exceeding 90 °.
  • the bending angle of the curved surface portion of the 3D cover glass will be described with reference to FIG.
  • FIG. 3 is a schematic cross-sectional view of the 3D cover glass 100 shown in FIG.
  • the bending angle ⁇ of the curved surface portion is an angle formed between a plane parallel to the plane of the central portion 110 of the 3D cover glass and the tip of the curved surface portion 120.
  • the angle formed by the tangent at the point on the curved surface 120 and the plane parallel to the plane of the center 110 of the 3D cover glass is such that the point extends from the center 110 of the 3D cover glass toward the tip of the curved surface 120.
  • the value increases as the position moves, but the value (maximum angle) when this angle is the maximum corresponds to the bending angle ⁇ .
  • the 3D cover glass 100 shown in FIGS. 2 and 3 is an example in which the bending angle ⁇ is 180 °.
  • the present invention provides a mold for forming a 3D cover glass having a curved surface portion having a bending angle ⁇ of more than 90 °, and a method for manufacturing a 3D cover glass using the mold for solving the above problems. With the goal.
  • the main molding die has a central portion having a curvature radius of more than 100 mm and a curved surface portion forming a three-dimensional curved surface in at least a part of the periphery of the central portion, and a concave portion is formed by the central portion and the curved surface portion.
  • At least a portion of the curved surface portion has a tangent angle of more than 90 ° and continuous to 180 ° or less, based on a plane formed by the central portion,
  • the curved portion where the angle of the tangent is continuous from more than 90 ° to 180 ° or less when viewed from the normal direction of the central portion, connects two adjacent sides of the outer edge of the concave portion and has a radius of curvature.
  • the corner has a groove continuous from a position where the angle of the tangent is maximum to an end of the center, Further, the main molding die has a through hole connected to the groove, Divisible in a direction parallel to the plane of the central portion, Provided is a mold for molding a 3D cover glass.
  • the main molding die has a polygonal outer edge of the concave portion when viewed from a normal direction of the central portion, It is preferable that the curved surface portion in which the angle of the tangent is continuous from more than 90 ° to 180 ° or less is formed over the entire circumference of the polygon, and the corner portion in the polygon has the groove at all corners.
  • the polygon is preferably a quadrangle.
  • the main molding die is a surface parallel to a plane of the central portion along an outer side from an end of the curved surface portion where the angle of the tangent is maximum. It is preferable to have an inclined portion having an inclination of 3 ° to 30 ° with respect to.
  • the width of the inclined portion is preferably 1 mm to 15 mm in plan view.
  • the main molding die is formed of a plurality of partial dies, and the curved surface portion formed over the entire circumference of the polygon has a portion on the side of the polygon. It is preferable that there is no parting line corresponding to a boundary formed between the partial dies.
  • the 3D cover glass molding die further has a bottom die on the side not having the concave portion of the main forming die, It is preferable that the bottom mold has a suction hole at a position including the center of gravity of the central portion, and the suction hole is connected to the through hole.
  • the 3D cover glass molding die further includes a ring-shaped alignment plate on the side having the concave portion of the main forming die, It is preferable that the inner edge of the ring shape of the alignment plate is located outside the outer edge of the recess in plan view.
  • the 3D cover glass molding die further includes an upper die that covers the main forming die on a side of the main forming die having the concave portion.
  • the 3D cover glass is removed from the 3D cover glass molding die, and a skirt portion outside a curved surface portion of the 3D cover glass is cut. Is preferred.
  • the method of manufacturing a 3D cover glass according to the present invention preferably includes, after the cutting, polishing the surface of the 3D cover glass, and thereafter, performing a chemical strengthening treatment on the 3D cover glass.
  • the 3D cover glass molding die and the 3D cover glass manufacturing method using the same according to the present invention are suitable for manufacturing a 3D cover glass having a curved surface portion having a bending angle ⁇ of more than 90 °.
  • FIG. 1 is a perspective view showing a conventional 3D cover glass.
  • FIG. 2 is a perspective view showing one configuration example of the 3D cover glass.
  • FIG. 3 is a schematic sectional view of the 3D cover glass shown in FIG.
  • FIG. 4 is an exploded perspective view showing one configuration example of the 3D cover glass molding die according to the embodiment of the present invention.
  • FIG. 5 is a partially enlarged view of the 3D cover glass molding die shown in FIG.
  • FIG. 6 is an assembly diagram of the 3D cover glass molding die shown in FIG.
  • FIG. 1 is a perspective view showing a conventional 3D cover glass.
  • FIG. 2 is a perspective view showing one configuration example of the 3D cover glass.
  • FIG. 3 is a schematic sectional view of the 3D cover glass shown in FIG.
  • FIG. 4 is an
  • FIG. 9 is a diagram for explaining a procedure for using the 3D cover glass molding die.
  • FIG. 10 is a diagram for explaining a procedure for using the 3D cover glass molding die.
  • FIG. 11 is a diagram for explaining a procedure for using the 3D cover glass molding die.
  • FIG. 12 is a diagram for explaining a procedure for using the 3D cover glass molding die.
  • FIG. 13 is a diagram for explaining a procedure for using the 3D cover glass molding die.
  • FIG. 14 is a diagram for explaining a procedure for using the 3D cover glass molding die.
  • FIG. 15 is a diagram for explaining a procedure for using the 3D cover glass molding die.
  • FIG. 16 is a diagram for explaining a procedure for using a 3D cover glass molding die.
  • a 3D cover glass forming mold according to an embodiment of the present invention (hereinafter, referred to as a “3D cover glass forming mold of the present embodiment”) has a central portion like a 3D cover glass 100 shown in FIGS.
  • Reference numeral 110 denotes a molding die used for molding a 3D cover glass having a flat surface and a curved surface portion 120 having a bending angle ⁇ of more than 90 ° and 180 ° or less around the central portion 110.
  • the 3D cover glass molded by the 3D cover glass molding die of the present embodiment has a flat central portion and a curved surface having a bending angle ⁇ of more than 90 ° and 180 ° or less on at least a part of the periphery of the central portion. If it has a part, it is not limited to what was shown in FIGS.
  • the plane refers to a portion having a radius of curvature exceeding 100 mm. That is, the central portion of the 3D cover glass is a continuous region including the center (center of gravity) of the 3D cover glass and having a radius of curvature exceeding 100 mm.
  • the curved surface portion refers to a portion having a radius of curvature of 100 mm or less in a cross section orthogonal to the plane of the center portion 110 and a portion in which the region between the portion and the end of the 3D cover glass is combined. That is, a region from the outer edge of the central portion 110 to the end of the 3D cover glass is a curved surface portion.
  • the radius of curvature of the curved portion may not be constant, and the curved portion may include a relatively flat portion.
  • the term “curved surface portion” without specifying the bending angle includes both a curved surface portion having a bending angle of more than 90 ° and 180 ° or less and a curved surface portion having a bending angle of 90 ° or less.
  • the bending angle ⁇ of the curved surface portion is an angle formed between a plane contacting the center of gravity of the central portion 110 of the 3D cover glass and the tip of the curved surface portion 120. More specifically, in a cross section orthogonal to the plane of the center 110, the end of the 3D cover glass is point A, the center of gravity of the 3D cover glass is point B, and the intersection of the tangent at point A and the tangent at point B is point C. In this case, the bending angle is represented by 180 ° -BACB.
  • the curved surface portion 120 is provided around the entire periphery of the center portion 110.
  • the 3D cover glass formed by the 3D cover glass forming die of the present embodiment is viewed in plan. It has a curved surface at any two of the four sides of the shape drawn by the outer edge and at least one corner connecting the two sides, and the bending angle ⁇ of at least a part of the curved surface is more than 90 ° 180 ° or less.
  • plane view means a viewpoint from a normal direction to a plane that is in contact with the center of gravity of the center of the 3D cover glass, or the center of gravity of the center of the mold described later, unless otherwise specified.
  • planar shape is a concept indicating a portion connecting two adjacent sides, and is not only a square portion but also a rounded portion, that is, a curved shape connecting two adjacent sides. It is a concept that also includes the part.
  • the 3D cover glass 100 has a substantially rectangular planar shape, has four sides and four corners, and all of them have a curved surface portion having a bending angle ⁇ of more than 90 ° and 180 ° or less.
  • the 3D cover glass molded by the 3D cover glass molding die of the present embodiment is bent only at any two adjacent sides and one corner connecting the two sides among the four sides.
  • the angle ⁇ may be more than 90 ° and 180 ° or less.
  • the corner portion refers to a portion where the radius of curvature of the outer edge is 100 mm or less when viewed from the normal direction of the center portion.
  • the 3D cover glass molded by the 3D cover glass molding die of the present embodiment has at least one corner connecting any three of the four sides and any two adjacent sides of the three sides.
  • the portion may have a curved surface portion having a bending angle ⁇ of more than 90 ° and 180 ° or less.
  • the 3D cover glass 100 shown in FIG. 2 is provided with a curved surface portion 120 having a bending angle ⁇ of more than 90 ° and 180 ° or less over the entire periphery of the central portion 110.
  • the 3D cover glass formed by the 3D cover glass forming mold of the present embodiment has a bending angle ⁇ of 90 ° at at least one corner connecting any two of the four sides. It may have a curved surface portion of super 180 ° or less.
  • the 3D cover glass molded by the 3D cover glass molding die of the present embodiment has one corner connecting any two adjacent sides among four sides, and one side of the two sides. May have a curved surface portion having a bending angle ⁇ of more than 90 ° and 180 ° or less.
  • the 3D cover glass 100 molded by the 3D cover glass molding die of the present embodiment is bent only at any two adjacent sides of the four sides and at one corner connecting the two sides.
  • the angle ⁇ may be more than 90 ° and 180 ° or less.
  • the 3D cover glass 100 molded by the 3D cover glass molding die of the present embodiment has one corner connecting any two adjacent sides among the four sides, and an adjacent corner different from the two sides. Only one corner connecting any two sides may have a curved portion having a bending angle ⁇ of more than 90 ° and 180 ° or less.
  • the 3D cover glass 100 molded by the 3D cover glass molding die of the present embodiment has two corners connecting three sides among four sides and only one of the three sides.
  • only two sides may have a curved surface portion having a bending angle ⁇ of more than 90 ° and 180 ° or less.
  • the 3D cover glass 100 molded by the 3D cover glass molding die of the present embodiment has two corners connecting the three sides among the four sides, and the bending angle ⁇ is 90 at only the three sides. It may have a curved surface part exceeding 180 ° or less.
  • the 3D cover glass 100 formed by the 3D cover glass forming mold of the present embodiment may have a curved surface portion having a bending angle ⁇ of more than 90 ° and 180 ° or less only at arbitrary three corner portions. Good.
  • the 3D cover glass 100 molded by the 3D cover glass molding die of the present embodiment has three arbitrary corners and only one of four sides, or only two sides, or three.
  • a curved surface having a bending angle ⁇ of more than 90 ° and 180 ° or less may be provided only on the sides.
  • the 3D cover glass 100 molded by the 3D cover glass molding die of the present embodiment has three arbitrary corners and a curved surface having a bending angle ⁇ of more than 90 ° and 180 ° or less on only four sides. May be.
  • the 3D cover glass 100 molded by the 3D cover glass molding die of the present embodiment may have a curved surface having a bending angle ⁇ of more than 90 ° and 180 ° or less only at four corners.
  • the bending angle of the curved surface portion other than the curved surface portion specified as having the angle ⁇ of more than 90 ° and 180 ° or less is 90 ° or less.
  • the planar shape of the 3D cover glass illustrated in FIG. 2 is a square, but the planar shape of the 3D cover glass formed by the 3D cover glass molding die of the present embodiment is not limited to a quadrangle, and may be a triangle, A polygon other than a quadrangle, such as a pentagon, a hexagon, and an octagon, may be used.
  • the polygon includes a polygon having a part with a rounded corner.
  • a shape obtained by a straight line and a virtual straight line obtained by extending the straight line in the planar shape is a polygon.
  • the object is a "polygon".
  • the planar shape of the 3D cover glass is a polygon and has a curved surface around the entire circumference
  • the polygon often has a rounded portion at all corners of the polygon.
  • the “corner” is a portion where the radius of curvature of the outer edge is 100 mm or less when viewed from the direction of the normal to the center similarly to the above.
  • the 3D cover glass molded by the 3D cover glass molding die of the present embodiment may have a planar shape having at least one corner connecting two straight lines.
  • FIG. 4 is an exploded perspective view showing an example of the configuration of the 3D cover glass molding die of the present embodiment
  • FIG. 5 is a partially enlarged view of the 3D cover glass molding die shown in FIG.
  • FIG. 6 is an assembly diagram of the 3D cover glass molding die shown in FIG.
  • FIG. 7 is a cross-sectional view of the 3D cover glass molding die shown in FIG. 6 at a cross section A
  • FIG. 8 is a cross-sectional view of the 3D cover glass molding die shown in FIG. 6 at a cross section B.
  • the 3D cover glass molding die in the configuration example shown in FIGS. 4 to 8 includes a main molding die 20, a bottom die 30, an upper die 40, and an alignment plate 50, and the 3D cover glass shown in FIGS. 100 can be used for molding.
  • the 3D cover glass molding die of the present embodiment only the main molding die 20 is an essential component. As will be described later, if the glass can be molded by vacuum suction, the bottom mold 30 and the upper mold 40 are formed.
  • the alignment plate 50 is an optional component.
  • the main molding die 20 has a flat central portion 21 and a curved surface portion 22 that forms a three-dimensional curved surface around the central portion 21.
  • the central portion 21 and the curved surface portion 22 form a concave portion 23.
  • the term “curved surface portion of the main molding die” indicates a curved surface portion having a three-dimensional curved surface shape.
  • flat means that the radius of curvature is greater than 100 mm. That is, the central portion of the main molding die is a continuous region including the center of the concave portion and having a radius of curvature exceeding 100 mm.
  • the central part of the 3D cover glass is molded by the central part of the main molding die.
  • the curved surface portion refers to a portion having a radius of curvature of 100 mm or less in a cross section orthogonal to the plane of the center portion 21 of the main molding die 20 and a portion in which a region between the portion and the end portion 28 is combined. . That is, a region from the outer edge of the center portion 21 to the end portion 28 is a curved surface portion.
  • the radius of curvature of the curved portion may not be constant, and the curved portion may include a relatively flat portion.
  • the curved surface of the 3D cover glass is formed by the curved surface of the main molding die.
  • the angle of a tangent to the curved surface portion of the main molding die with reference to the center plane is an angle formed by a plane tangent to the center of the central portion and a tangent line in the curved surface portion. It is. More specifically, the angle of the tangent with respect to the plane of the center is defined as a point A on the curved surface in a cross section orthogonal to the plane of the center of the main molding die, and the center of the center. Is the point B, and the intersection of the tangent at the point A and the tangent at the point B is the point C, the bending angle is expressed by 180 ° - ⁇ ACB.
  • the angle when the point A is the end is the “maximum tangent angle with respect to the center plane”.
  • the maximum tangent angle with respect to the center plane is more than 90 ° and 180 ° or less, and 90 ° or less curved surface portion. And both.
  • the illustrated main molding die 20 has a curved surface portion 22 over the entire periphery of the central portion 21.
  • the main molding die of the 3D cover glass molding die of the present embodiment may include any two sides among the four sides in the planar shape of the concave portion and at least one side connecting the two sides. It is only necessary that the corner has a curved surface having a maximum tangent angle of more than 90 ° and 180 ° or less with respect to the plane of the central portion 21.
  • the main molding die of the 3D cover glass molding die of the present embodiment includes two adjacent sides among four sides in the planar shape of the concave portion and one corner connecting the two sides. Only, the maximum angle of the tangent with respect to the plane of the central portion 21 may be more than 90 ° and 180 ° or less.
  • the main molding die of the 3D cover glass molding die of the present embodiment connects any three of the four sides in the planar shape of the concave portion and any two adjacent sides of the three sides. At least one corner may have a curved surface having a maximum tangent angle of more than 90 ° and 180 ° or less with respect to the plane of the central portion 21.
  • the illustrated curved surface portion 22 of the main molding die 20 is based on the plane of the central portion 21. Are continuous up to 180 °.
  • the curved surface portion of the main molding die of the 3D cover glass molding die of the present embodiment is based on the plane of the central portion according to the bending angle of the curved surface portion of the 3D cover glass to be molded.
  • the angle of the tangent may be continuous from more than 90 ° to 180 ° or less.
  • a curved surface portion in which the angle of the tangent is continuous from more than 90 ° to 180 ° or less based on the plane of the center portion is referred to as a curved surface portion in which the maximum angle of the tangent is more than 90 ° and 180 ° or less. I do.
  • the main molding die of the 3D cover glass molding die of the present embodiment is configured such that, among the outer edges of the concave portion in a plan view, at least one corner connecting two straight lines has the plane of the central portion 21 at least. It is sufficient that the tangent has a curved surface portion having a maximum angle of 90 ° or more and 180 ° or less as a reference.
  • the corner portion refers to a portion having a radius of curvature of 100 mm or less at the outer edge of the concave portion in plan view.
  • the linear portion refers to a portion having a radius of curvature exceeding 100 mm at the outer edge of the concave portion in plan view.
  • the outer edge of the concave portion 23 corresponds to a portion where the concave portion is located on the outermost side in a plan view. Therefore, when the outer edge of the concave portion in plan view has a curved surface portion 22 having a maximum tangent angle of more than 90 ° with respect to the plane of the central portion 21 of the main molding die 20, the angle of the tangent angle is This corresponds to a line formed by connecting positions at 90 °.
  • the concave portion 23 of the main molding die 20 in the present embodiment has a tangent to only one corner connecting any two adjacent sides of the four sides with respect to the plane of the central portion 21. May have a curved surface portion having a maximum angle of more than 90 ° and 180 ° or less.
  • the concave portion 23 of the main molding die 20 in the present embodiment has one corner portion connecting any two adjacent sides among the four sides, and the center portion 21 only on one side of the two sides. May have a curved surface portion having a maximum tangent angle of more than 90 ° and 180 ° or less with respect to the flat surface.
  • the recessed portion 23 of the main molding die 20 in the present embodiment is based on the plane of the central portion 21 only in any two adjacent sides and one corner connecting the two sides among the four sides.
  • the maximum angle of the tangent may be more than 90 ° and 180 ° or less.
  • the concave portion 23 of the main molding die 20 in the present embodiment connects one corner portion connecting any two adjacent sides of the four sides to any two adjacent sides different from the two sides. Only one corner may have a curved surface having a maximum tangent angle of more than 90 ° and 180 ° or less with respect to the plane of the central portion 21.
  • the concave portion 23 of the main molding die 20 in the present embodiment has two corner portions connecting the three sides of the four sides, and only one or two of the three sides has the central portion.
  • 21 may have a curved surface part having a bending angle ⁇ of more than 90 ° and 180 ° or less.
  • the concave portion 23 of the main molding die 20 in the present embodiment has two corners connecting three sides of the four sides, and only the three sides are based on the plane of the central portion 21.
  • the tangent may have a curved portion having a maximum angle of more than 90 ° and 180 ° or less.
  • the concave portion 23 of the main molding die 20 in the present embodiment has a curved surface having a maximum tangent angle of more than 90 ° and not more than 180 ° at only three arbitrary corners with respect to the plane of the central portion 21. It may have a part.
  • the concave portion 23 of the main molding die 20 is formed such that only three arbitrary corners and one of the four sides (or two or three sides) have the flat surface of the central portion 21. May have a curved surface portion having a maximum angle of a tangent line of more than 90 ° and 180 ° or less with respect to.
  • the concave portion 23 of the main molding die 20 has a maximum tangent angle of more than 90 ° with respect to the plane of the central portion 21 only at any three corners and four sides. ° or less.
  • the concave portion 23 of the main molding die 20 in the present embodiment has a curved surface portion having a maximum angle of a tangent of more than 90 ° and 180 ° or less with respect to the plane of the central portion 21 only at four corners. May have.
  • the maximum tangent angle of the curved surface portion other than the curved surface portion having a maximum tangent angle of more than 90 ° and not more than 180 ° with respect to the plane of the central portion 21 specified above is 90 ° or less.
  • the outer edge of the concave portion 23 in a plan view is rectangular, but the outer peripheral shape of the concave portion in plan view of the main molding die in the present embodiment is not limited to a quadrangle. , Pentagons, hexagons, octagons, and other polygons other than rectangles.
  • the outer edge of the concave portion 23 corresponds to a portion where the concave portion is located on the outermost side in a plan view.
  • the angle of the tangent is 90 °.
  • the line formed by connecting the positions of ° over the entire circumference corresponds to the outer edge.
  • the corner 24 having the curved surface portion 22 having a maximum tangent angle of more than 90 ° and 180 ° or less with respect to the plane of the central portion 21 is located at a position where the tangent angle is the maximum.
  • the groove 25 is connected to the through hole 26 of the main molding die 20.
  • the groove 25 and the through-hole 26 serve as a vacuum suction path when forming a 3D cover glass.
  • a groove portion 25 connected to the through hole 26 is provided at a corner portion 24 where glass is the slowest to follow the mold during vacuum suction and is difficult to mold. For this reason, the glass can be reliably formed in close contact with the entire concave portion of the main molding die including the corners.
  • the main molding die 20 shown in FIG. 4 has a curved surface portion 22 having a maximum tangent angle of more than 90 ° and 180 ° or less with respect to the plane of the central portion 21 over the entire periphery of the central portion 21. Therefore, in the figure, all four corners are provided with a groove part continuous from the position where the angle of the tangent is maximum to the end of the center part 21 and a through hole connected to the groove part. .
  • one groove 25 is provided at one corner, but two or more grooves may be provided at one corner.
  • the groove may have a structure that branches from one path to a plurality of paths, or a structure in which a plurality of grooves are independently provided.
  • the main molding die 20 can be divided in the direction parallel to the plane of the central part 21 as shown in FIG. By dividing the main molding die 20 in a direction parallel to the plane of the central portion 21, a 3D cover glass having a curved portion having a bending angle ⁇ of more than 90 ° and not more than 180 ° can be easily formed. Can be taken out. Further, the main molding die 20 that can be divided has a dividing line corresponding to a boundary formed between adjacent partial dies when a plurality of partial dies are assembled.
  • the dividing line cannot be arranged avoiding the curved surface portion of the main molding die.
  • the main molding die 20 shown in FIG. 4 has a curved portion over the entire periphery of the central portion, the dividing line cannot be arranged avoiding the curved portion.
  • the dividing line is preferably arranged at the center is that even if the dividing line is transferred to the center of the 3D cover glass, the dividing line can be easily repaired by grinding and polishing.
  • the dividing line is arranged at the corner of the curved surface because the corner of the curved surface of the 3D cover glass is unlikely to be used as a display part, and when it is used as a display part. However, this is because the area is small and defects due to transfer are inconspicuous.
  • the dividing line can be arranged avoiding the curved surface portion of the main molding die.
  • the dividing line is preferably provided only at the center. This is because even if the dividing line is transferred to the central part of the 3D cover glass, the restoration by grinding and polishing is easy.
  • the main molding die 20 is inclined from the end 28 at which the angle of the tangent of the curved surface portion 22 is maximum to the surface parallel to the plane of the central portion 21 by 3 ° to 30 ° along the outside. It is good to have the inclined part 27 which makes the following.
  • the molded 3D cover glass may have a hem (a part to be finally cut off) outside the curved surface in some cases. In such a case, the main molding metal is formed by the hem and the curved surface of the 3D cover glass.
  • the end portion 28 of the curved surface portion 22 of the mold 20 may be pinched, and the 3D cover glass may not be easily taken out.
  • the inclination of the inclined portion 27 is preferably 4 ° to 25 ° with respect to a plane parallel to the plane of the central portion 21, and more preferably 5 ° to 20 °.
  • the width of the inclined portion may be 1 mm to 15 mm in plan view, and is preferably 2 mm to 10 mm.
  • the bottom mold 30 is arranged on the side of the main molding die 20 that does not have a recess.
  • the bottom mold 30 has a step portion 31 at a central portion thereof at a position lower than the periphery, and a suction hole 32 at a position including the center of gravity of the step portion 31.
  • the suction hole 32 is connected to the through-hole 26 of the main molding die 20 via the stepped portion 31, and when the 3D cover glass is molded, the main molding die is used.
  • a groove for vacuum suction is formed by the groove 25 of 20, the through hole 26, the step 31 of the bottom mold 30, and the hole 32 for suction.
  • the suction holes in the bottom mold are not limited to the illustrated arrangement.
  • the bottom portion may not have a step portion at the center portion, and may have suction holes directly below the through holes of the main molding die, that is, at four corners of the bottom die.
  • the present 3D cover glass molding die need not have a bottom die. In this case, vacuum suction is performed directly through the through hole of the main molding die.
  • having a bottom mold allows the vacuum suction path to be concentrated in one place. Therefore, there is only one joint between the equipment and the mold, and the structure for vacuum suction on the equipment side is also one. Therefore, the equipment can be simplified.
  • a vacuum chamber is provided inside the mold, uniform vacuum suction can be performed.
  • the upper mold 40 is arranged on the side of the main molding die 20 having the concave portion 23.
  • the 3D cover glass molding die of the present embodiment does not need to have an upper die, when the main molding die 20 is covered with the upper die 40, the glass can be efficiently heated from above and below. Therefore, a temperature difference hardly occurs in the thickness direction of the glass, and thermal deformation during heating can be suppressed.
  • the edge of the glass may jump up in a direction opposite to the direction of vacuum suction due to the reaction force and break the vacuum, but the phenomenon is caused by the presence of the upper die. Can be suppressed. Therefore, if there is an upper mold, vacuum suction can be more effectively performed when forming a 3D cover glass. It is preferable that the upper mold 40 completely covers the upper surface of the main molding die 20.
  • the ring-shaped alignment plate 50 is disposed on the side of the main molding die 20 having the concave portion 23.
  • the ring-shaped inner edge of the alignment plate 50 is located outside the outer edge of the concave portion 23 of the main molding die 20 in plan view.
  • the 3D cover glass molding die of the present embodiment does not need to have an alignment plate, when the 3D cover glass is molded by disposing the alignment plate 50, the main molding die 20 is formed on the 3D cover glass molding die. Positioning when placing the flat glass plate 200 is facilitated. In other words, the presence of the alignment plate 50 has the effect of stabilizing the variation in positioning, and improves the yield during mass production.
  • FIG. 9 is a plan view of the bottom mold 30.
  • FIG. 10 is a plan view of the main molding die 20.
  • the main molding die 20 has a structure that is divided into four partial dies so that each of the four corners has a boundary line.
  • FIG. 11 when the main molding die 20 is assembled on the bottom die 30, they are integrated with a parting line at the boundary formed by the partial die.
  • the alignment plate 50 is placed on the main molding die 20.
  • FIG. 13 a planar glass plate 200 is placed on the main molding die 20.
  • FIG. 13 a planar glass plate 200 is placed on the main molding die 20.
  • the upper die 40 is fixed on the alignment plate 50 so as to cover the alignment plate 50.
  • FIG. 15 is a perspective view showing a state where the glass plate 200 is placed on the main molding die 20 before molding of the 3D cover glass
  • FIG. 16 is an upper mold 40 after molding of the 3D cover glass. It is the perspective view which showed the state which removed.
  • the 3D cover glass after molding has the above-mentioned skirt portion outside the curved surface portion.
  • a skirt portion outside the curved surface portion of the formed 3D cover glass is cut to define a 3D cover glass having a predetermined shape.
  • the surface (flat surface, curved surface, end surface) of the 3D cover glass is polished or immersed in a predetermined molten salt to perform ion exchange, thereby performing a chemical strengthening treatment, so that the bending angle ⁇ is reduced.
  • a chemically strengthened 3D cover glass of more than 90 ° and 180 ° or less may be produced.
  • 3D cover glass molding die 20 main molding die 21: central portion 22: curved surface portion 23: concave portion 24: corner portion 25: groove portion 26: through hole 27: inclined portion 28: end portion 30: bottom mold 31: step portion 32: suction hole 40: upper die 50: alignment plate 100, 300: 3D cover glass 110, 310: central portion 120, 320: curved portion 122: end portion 200: glass plate

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Abstract

The present invention relates to a molding die for a 3D cover glass, the molding die having a main molding die, wherein: the main molding die has a recessed part formed by a center section and a curved section; at least a portion of the curved section has tangential lines having angles continuous from greater than 90° and equal to or smaller than 180° with respect to the center section; the curved section is formed in at least one corner section of the recessed part; and the corner section has a predetermined groove section. Furthermore, the main molding die has a through-hole that connects to the groove section and the main molding die can be divided in a direction parallel to the plane of the center section.

Description

3Dカバーガラス成形用金型、およびそれを用いた3Dカバーガラスの製造方法Mold for molding 3D cover glass and method for producing 3D cover glass using the same
 本発明は、携帯電話、スマートフォン、タブレット型端末といったモバイル機器やCID(Center Information Display)、クラスターといった車載ディスプレイに使用される画像表示装置のための3次元形状をしたカバーガラス(3Dカバーガラス)の成形用金型、および、該成形用金型を用いた3Dカバーガラスの製造方法に関する。 The present invention relates to a cover glass (3D cover glass) having a three-dimensional shape for an image display device used for a mobile device such as a mobile phone, a smartphone, a tablet terminal, or a vehicle-mounted display such as a CID (Center Information Display) or a cluster. The present invention relates to a molding die and a method for producing a 3D cover glass using the molding die.
 携帯電話、スマートフォン、タブレット型端末といったモバイル機器等の意匠性を向上させるため、モバイル機器等に使用される画像表示装置への3Dカバーガラスの適用が検討されている。図1は、従来の3Dカバーガラスを示した斜視図である。図1に示す3Dカバーガラス300は、中心部310が平面で、中心部310の周辺に3次元曲面形状をなす曲面部320を有している。以下、本明細書において、3Dカバーガラスの曲面部と記載した場合、3次元曲面形状をなす曲面部を指す。 適用 In order to improve the design of mobile devices such as mobile phones, smartphones and tablet terminals, application of 3D cover glass to image display devices used in mobile devices and the like is being studied. FIG. 1 is a perspective view showing a conventional 3D cover glass. The 3D cover glass 300 shown in FIG. 1 has a flat central portion 310 and a curved portion 320 having a three-dimensional curved shape around the central portion 310. Hereinafter, in the present specification, a curved surface portion of a 3D cover glass indicates a curved surface portion having a three-dimensional curved surface shape.
 特許文献1は、スマートフォン等の情報端末のカバーガラスとして端部が湾曲するいわゆる3Dカバーガラスの成形方法について開示している。特許文献1には、3Dカバーガラス用にデザインされた成形型が開示され、その成形型の一部に穴を設けて真空引きする成形方法により所望の3Dカバーガラスを実現している。 Patent Document 1 discloses a method of forming a so-called 3D cover glass having a curved end as a cover glass of an information terminal such as a smartphone. Patent Literature 1 discloses a mold designed for a 3D cover glass, and a desired 3D cover glass is realized by a molding method in which a hole is provided in a part of the mold and a vacuum is drawn.
米国特許出願公開第2017/121210号明細書US Patent Application Publication No. 2017/121210
 3Dカバーガラスは、その曲面部の曲げ角度が90°を超えるデザインが要求される場合もある。図2は、3Dカバーガラスの一構成例を示した斜視図である。図2に示す3Dカバーガラス100は、中心部110が平面で、中心部110の周辺に曲げ角度が90°を超える曲面部120を有する。3Dカバーガラスの曲面部の曲げ角度について、図3を参照して説明する。図3は、図2に示す3Dカバーガラス100の断面模式図である。
 曲面部の曲げ角度αは、3Dカバーガラスの中心部110の平面に平行な平面と、曲面部120の先端と、がなす角度である。つまり、曲面部120上の点における接線と、3Dカバーガラスの中心部110の平面に平行な平面とがなす角は、当該点が3Dカバーガラスの中心部110から曲面部120の先端に向かって移動するにつれて大きくなるが、この角度が最大となった際の値(最大角度)が曲げ角度αに相当する。図2及び3に示す3Dカバーガラス100は、曲げ角度αが180°の例である。
In some cases, the 3D cover glass is required to have a design in which the bending angle of the curved surface portion exceeds 90 °. FIG. 2 is a perspective view showing one configuration example of the 3D cover glass. The 3D cover glass 100 shown in FIG. 2 has a flat central part 110 and a curved part 120 around the central part 110 with a bending angle exceeding 90 °. The bending angle of the curved surface portion of the 3D cover glass will be described with reference to FIG. FIG. 3 is a schematic cross-sectional view of the 3D cover glass 100 shown in FIG.
The bending angle α of the curved surface portion is an angle formed between a plane parallel to the plane of the central portion 110 of the 3D cover glass and the tip of the curved surface portion 120. That is, the angle formed by the tangent at the point on the curved surface 120 and the plane parallel to the plane of the center 110 of the 3D cover glass is such that the point extends from the center 110 of the 3D cover glass toward the tip of the curved surface 120. The value increases as the position moves, but the value (maximum angle) when this angle is the maximum corresponds to the bending angle α. The 3D cover glass 100 shown in FIGS. 2 and 3 is an example in which the bending angle α is 180 °.
 曲面部の曲げ角度αが90°を超える3Dカバーガラスを、金型を用いて成形する場合、該金型の曲面部と対応する部分にも角度が90°を超える曲面形状を有するため、真空成形後のガラスが取り出せないという問題があった。また、曲げ角度αが90°を超えるとともに平面視において、その外縁が曲面状をなす部分は、より複雑な3次元形状をなすため、高い精度での3次元形状を実現するのは困難であった。 When a 3D cover glass having a curved surface portion having a bending angle α of more than 90 ° is molded using a mold, a portion corresponding to the curved surface portion of the mold also has a curved surface shape having an angle of more than 90 °. There was a problem that the glass after molding could not be taken out. In addition, since the bending angle α exceeds 90 ° and the portion whose outer edge forms a curved surface in plan view forms a more complicated three-dimensional shape, it is difficult to realize a three-dimensional shape with high accuracy. Was.
 本発明は、上記の問題点を解決するため、曲げ角度αが90°を超える曲面部を有する3Dカバーガラスの成形用金型および該成形用金型を用いた3Dカバーガラスの製造方法の提供を目的とする。 The present invention provides a mold for forming a 3D cover glass having a curved surface portion having a bending angle α of more than 90 °, and a method for manufacturing a 3D cover glass using the mold for solving the above problems. With the goal.
 上記した目的を達成するため、3Dカバーガラスを形成するための主成形用金型を有し、
 前記主成形用金型は、曲率半径が100mm超の中心部と、前記中心部の周辺の少なくとも一部に3次元曲面をなす曲面部を有し、前記中心部及び前記曲面部により凹部が形成され、
 前記曲面部の少なくとも一部は、前記中心部がなす平面を基準としたとき、接線の角度が90°超180°以下まで連続しており、
 かつ、前記接線の角度が90°超180°以下まで連続している曲面部は、前記中心部の法線方向から見たとき、前記凹部の外縁のうち、2つの隣り合う辺を繋ぎ曲率半径が100mm以下で定義される少なくとも1つの角部に形成され、
 前記角部は、前記接線の角度が最大となる位置から前記中心部の端部まで連続する溝部を有し、
 さらに、前記主成形用金型は、前記溝部と接続する貫通孔を有し、
 前記中心部の平面と平行方向に分割可能である、
 3Dカバーガラス成形用金型を提供する。
In order to achieve the above-mentioned object, it has a main molding die for forming a 3D cover glass,
The main molding die has a central portion having a curvature radius of more than 100 mm and a curved surface portion forming a three-dimensional curved surface in at least a part of the periphery of the central portion, and a concave portion is formed by the central portion and the curved surface portion. And
At least a portion of the curved surface portion has a tangent angle of more than 90 ° and continuous to 180 ° or less, based on a plane formed by the central portion,
In addition, the curved portion where the angle of the tangent is continuous from more than 90 ° to 180 ° or less, when viewed from the normal direction of the central portion, connects two adjacent sides of the outer edge of the concave portion and has a radius of curvature. Is formed on at least one corner defined by 100 mm or less;
The corner has a groove continuous from a position where the angle of the tangent is maximum to an end of the center,
Further, the main molding die has a through hole connected to the groove,
Divisible in a direction parallel to the plane of the central portion,
Provided is a mold for molding a 3D cover glass.
 また、3Dカバーガラス成形用金型において、前記主成形用金型は、前記中心部の法線方向から見たとき、前記凹部の外縁が多角形であり、
 前記接線の角度が90°超180°以下まで連続している曲面部は、前記多角形の全周にわたって形成されるとともに、前記多角形における角部の全てに、前記溝部を有することが好ましい。
In the 3D cover glass molding die, the main molding die has a polygonal outer edge of the concave portion when viewed from a normal direction of the central portion,
It is preferable that the curved surface portion in which the angle of the tangent is continuous from more than 90 ° to 180 ° or less is formed over the entire circumference of the polygon, and the corner portion in the polygon has the groove at all corners.
 また、3Dカバーガラス成形用金型において、前記多角形は、四角形であることが好ましい。 In the 3D cover glass molding die, the polygon is preferably a quadrangle.
 また、3Dカバーガラス成形用金型において、前記主成形用金型は、前記曲面部のうち前記接線の角度が最大となる端部から、外側に沿って、前記中心部の平面と平行する面に対して3°~30°の傾斜をなす傾斜部を有することが好ましい。 Further, in the 3D cover glass molding die, the main molding die is a surface parallel to a plane of the central portion along an outer side from an end of the curved surface portion where the angle of the tangent is maximum. It is preferable to have an inclined portion having an inclination of 3 ° to 30 ° with respect to.
 また、3Dカバーガラス成形用金型において、前記傾斜部の幅は、平面視において1mm~15mmであることが好ましい。 In the 3D cover glass molding die, the width of the inclined portion is preferably 1 mm to 15 mm in plan view.
 また、3Dカバーガラス成形用金型において、前記主成形用金型は、複数の部分金型で構成され、多角形の全周にわたって形成された前記曲面部のうち、前記多角形の辺上に前記部分金型どうしが隣接してできる境界に相当する分割線が存在しないことが好ましい。 Further, in the 3D cover glass molding die, the main molding die is formed of a plurality of partial dies, and the curved surface portion formed over the entire circumference of the polygon has a portion on the side of the polygon. It is preferable that there is no parting line corresponding to a boundary formed between the partial dies.
 また、3Dカバーガラス成形用金型は、前記主形成用金型の前記凹部を有さない側に、底型をさらに有し、
 前記底型は、前記中心部の重心を含む位置に吸引用の穴を有し、前記吸引用の穴は前記貫通孔と接続されることが好ましい。
Further, the 3D cover glass molding die further has a bottom die on the side not having the concave portion of the main forming die,
It is preferable that the bottom mold has a suction hole at a position including the center of gravity of the central portion, and the suction hole is connected to the through hole.
 また、3Dカバーガラス成形用金型は、前記主形成用金型の前記凹部を有する側に、リング形状のアライメント板をさらに有し、
 前記アライメント板のリング形状の内縁は、平面視において前記凹部の外縁よりも外側にあることが好ましい。
In addition, the 3D cover glass molding die further includes a ring-shaped alignment plate on the side having the concave portion of the main forming die,
It is preferable that the inner edge of the ring shape of the alignment plate is located outside the outer edge of the recess in plan view.
 また、3Dカバーガラス成形用金型は、前記主形成用金型の前記凹部を有する側に、前記主形成用金型を覆う上型をさらに有することが好ましい。 In addition, it is preferable that the 3D cover glass molding die further includes an upper die that covers the main forming die on a side of the main forming die having the concave portion.
 また、本発明の3Dカバーガラス成形用金型の前記主成形用金型上に平面状のガラス板を載置することと、その後、前記3Dカバーガラス成形用金型を加熱しながら前記貫通孔を経由して真空吸引して前記平面状のガラス板を3D形状に成形した後、冷却することと、を含む3Dカバーガラスの製造方法を提供する。 In addition, placing a flat glass plate on the main molding die of the 3D cover glass molding die of the present invention, and thereafter, heating the 3D cover glass molding die and forming the through-hole while heating the 3D cover glass molding die. And forming the flat glass plate into a 3D shape by vacuum suction through the substrate, and then cooling the 3D cover glass.
 また、本発明の3Dカバーガラスの製造方法において、前記冷却後に、前記3Dカバーガラスを前記3Dカバーガラス成形用金型から取り出して、前記3Dカバーガラスの曲面部の外側にある裾部を切断することが好ましい。 In the method of manufacturing a 3D cover glass according to the present invention, after the cooling, the 3D cover glass is removed from the 3D cover glass molding die, and a skirt portion outside a curved surface portion of the 3D cover glass is cut. Is preferred.
 また、本発明の3Dカバーガラスの製造方法において、前記切断後、前記3Dカバーガラスの表面を研磨加工することと、その後、前記3Dカバーガラスに化学強化処理をすることとを含むことが好ましい。 In addition, the method of manufacturing a 3D cover glass according to the present invention preferably includes, after the cutting, polishing the surface of the 3D cover glass, and thereafter, performing a chemical strengthening treatment on the 3D cover glass.
 本発明の3Dカバーガラス成形用金型、およびそれを用いた3Dカバーガラスの製造方法は、曲げ角度αが90°を超える曲面部を有する3Dカバーガラスの製造に好適である。 The 3D cover glass molding die and the 3D cover glass manufacturing method using the same according to the present invention are suitable for manufacturing a 3D cover glass having a curved surface portion having a bending angle α of more than 90 °.
図1は、従来の3Dカバーガラスを示した斜視図である。FIG. 1 is a perspective view showing a conventional 3D cover glass. 図2は、3Dカバーガラスの一構成例を示した斜視図である。FIG. 2 is a perspective view showing one configuration example of the 3D cover glass. 図3は、図2に示す3Dカバーガラスの断面模式図である。FIG. 3 is a schematic sectional view of the 3D cover glass shown in FIG. 図4は、本発明の実施形態にかかる3Dカバーガラス成形用金型の一構成例を示した分解斜視図である。FIG. 4 is an exploded perspective view showing one configuration example of the 3D cover glass molding die according to the embodiment of the present invention. 図5は、図4に示す3Dカバーガラス成形用金型の部分拡大図である。FIG. 5 is a partially enlarged view of the 3D cover glass molding die shown in FIG. 図6は、図4に示す3Dカバーガラス成形用金型の組立図である。FIG. 6 is an assembly diagram of the 3D cover glass molding die shown in FIG. 図7は、図6に示す3Dカバーガラス成形用金型の断面Aでの断面図である。FIG. 7 is a cross-sectional view of the 3D cover glass molding die shown in FIG. 図8は、図6に示す3Dカバーガラス成形用金型の断面Bでの断面図である。8 is a cross-sectional view of the 3D cover glass molding die shown in FIG. 図9は、3Dカバーガラス成形用金型の使用手順を説明するための図である。FIG. 9 is a diagram for explaining a procedure for using the 3D cover glass molding die. 図10は、3Dカバーガラス成形用金型の使用手順を説明するための図である。FIG. 10 is a diagram for explaining a procedure for using the 3D cover glass molding die. 図11は、3Dカバーガラス成形用金型の使用手順を説明するための図である。FIG. 11 is a diagram for explaining a procedure for using the 3D cover glass molding die. 図12は、3Dカバーガラス成形用金型の使用手順を説明するための図である。FIG. 12 is a diagram for explaining a procedure for using the 3D cover glass molding die. 図13は、3Dカバーガラス成形用金型の使用手順を説明するための図である。FIG. 13 is a diagram for explaining a procedure for using the 3D cover glass molding die. 図14は、3Dカバーガラス成形用金型の使用手順を説明するための図である。FIG. 14 is a diagram for explaining a procedure for using the 3D cover glass molding die. 図15は、3Dカバーガラス成形用金型の使用手順を説明するための図である。FIG. 15 is a diagram for explaining a procedure for using the 3D cover glass molding die. 図16は、3Dカバーガラス成形用金型の使用手順を説明するための図である。FIG. 16 is a diagram for explaining a procedure for using a 3D cover glass molding die.
 以下、図面を参照して本発明を説明する。
 本発明の一実施形態にかかる3Dカバーガラス成形用金型(以下「本実施形態の3Dカバーガラス成形用金型」という)は、図2及び3に示す3Dカバーガラス100のように、中心部110が平面で、中心部110の周辺に曲げ角度αが90°超180°以下の曲面部120を有する3Dカバーガラスの成形に用いる成形用金型である。但し、本実施形態の3Dカバーガラス成形用金型により成形される3Dカバーガラスは、中心部が平面で、該中心部の周辺の少なくとも一部に曲げ角度αが90°超180°以下の曲面部を有すれば、図2及び3に示したものに限定されない。
 ここで、平面とは、曲率半径が100mm超の部位を指す。すなわち、3Dカバーガラスガラスの中心部とは、すなわち、3Dカバーガラスガラスの中心(重心)を含み、曲率半径が100mm超である連続した領域である。
 また、曲面部とは、中心部110の平面と直交する断面における曲率半径が100mm以下の部分、及び、当該部分と3Dカバーガラスの端部の間の領域をあわせた部分を指す。すなわち、中心部110の外縁から3Dカバーガラスの端部までの領域が曲面部である。曲面部の曲率半径は一定でなくてもよく、また、曲面部は比較的平坦な部分を含んでいてもよい。なお、曲げ角度を指定せずに単に「曲面部」という場合は、曲げ角度が90°超180°以下の曲面部、および曲げ角度が90°以下の曲面部の両方を包含する。
 曲面部の曲げ角度αは、3Dカバーガラスの中心部110の重心に接する平面と、曲面部120の先端と、がなす角度である。より詳細には、中心部110の平面と直交する断面における、3Dカバーガラスの端部を点A、3Dカバーガラスの重心を点B、点Aにおける接線と点Bにおける接線との交点を点Cとした際に、曲げ角度は180°-∠ACBで表される。
Hereinafter, the present invention will be described with reference to the drawings.
A 3D cover glass forming mold according to an embodiment of the present invention (hereinafter, referred to as a “3D cover glass forming mold of the present embodiment”) has a central portion like a 3D cover glass 100 shown in FIGS. Reference numeral 110 denotes a molding die used for molding a 3D cover glass having a flat surface and a curved surface portion 120 having a bending angle α of more than 90 ° and 180 ° or less around the central portion 110. However, the 3D cover glass molded by the 3D cover glass molding die of the present embodiment has a flat central portion and a curved surface having a bending angle α of more than 90 ° and 180 ° or less on at least a part of the periphery of the central portion. If it has a part, it is not limited to what was shown in FIGS.
Here, the plane refers to a portion having a radius of curvature exceeding 100 mm. That is, the central portion of the 3D cover glass is a continuous region including the center (center of gravity) of the 3D cover glass and having a radius of curvature exceeding 100 mm.
In addition, the curved surface portion refers to a portion having a radius of curvature of 100 mm or less in a cross section orthogonal to the plane of the center portion 110 and a portion in which the region between the portion and the end of the 3D cover glass is combined. That is, a region from the outer edge of the central portion 110 to the end of the 3D cover glass is a curved surface portion. The radius of curvature of the curved portion may not be constant, and the curved portion may include a relatively flat portion. In addition, the term “curved surface portion” without specifying the bending angle includes both a curved surface portion having a bending angle of more than 90 ° and 180 ° or less and a curved surface portion having a bending angle of 90 ° or less.
The bending angle α of the curved surface portion is an angle formed between a plane contacting the center of gravity of the central portion 110 of the 3D cover glass and the tip of the curved surface portion 120. More specifically, in a cross section orthogonal to the plane of the center 110, the end of the 3D cover glass is point A, the center of gravity of the 3D cover glass is point B, and the intersection of the tangent at point A and the tangent at point B is point C. In this case, the bending angle is represented by 180 ° -BACB.
 図2に示す3Dカバーガラス100では、中心部110の全周辺にわたって曲面部120が設けられているが、本実施形態の3Dカバーガラス成形用金型により成形される3Dカバーガラスは、平面視において外縁が描く形状の4辺のうちいずれか2辺と、該2辺を繋ぐ少なくとも1つの角部に曲面部を有しており、当該曲面部の少なくとも一部の曲げ角度αが90°超180°以下であればよい。
 なお、本明細書において「平面視」とは、とくにことわりがない限り、3Dカバーガラスの中心部の重心に接する平面に対する法線方向からの視点、または、後述する金型の中心部の重心に接する平面に対する法線方向からの視点、として説明する。また、本明細書において、平面視において外縁が描く形状のことを単に「平面形状」という場合がある。
 また、本明細書において「角部」とは、隣り合う2辺を繋ぐ部分を指す概念であり、角状の部分のみならず、丸みを帯びた部分、すなわち、隣り合う2辺を繋ぐ曲線状の部分も含む概念である。
In the 3D cover glass 100 illustrated in FIG. 2, the curved surface portion 120 is provided around the entire periphery of the center portion 110. However, the 3D cover glass formed by the 3D cover glass forming die of the present embodiment is viewed in plan. It has a curved surface at any two of the four sides of the shape drawn by the outer edge and at least one corner connecting the two sides, and the bending angle α of at least a part of the curved surface is more than 90 ° 180 ° or less.
In this specification, “plan view” means a viewpoint from a normal direction to a plane that is in contact with the center of gravity of the center of the 3D cover glass, or the center of gravity of the center of the mold described later, unless otherwise specified. The description will be made as a viewpoint from the normal direction to the tangent plane. In this specification, the shape drawn by the outer edge in plan view may be simply referred to as “planar shape”.
Further, in the present specification, the “corner” is a concept indicating a portion connecting two adjacent sides, and is not only a square portion but also a rounded portion, that is, a curved shape connecting two adjacent sides. It is a concept that also includes the part.
 例えば、図2中、3Dカバーガラス100は、平面形状が略長方形であり、4つの辺と4つの角部を有し、これらの全てが曲げ角度αが90°超180°以下である曲面部を有するが、本実施形態の3Dカバーガラス成形用金型により成形される3Dカバーガラスは、4つの辺のうち、隣り合う任意の2辺と該2辺を繋ぐ1つの角部にのみ、曲げ角度αが90°超180°以下の曲面部を有してもよい。なお、角部とは、中心部の法線方向から見たとき、外縁の曲率半径が100mm以下の部分を指す。 For example, in FIG. 2, the 3D cover glass 100 has a substantially rectangular planar shape, has four sides and four corners, and all of them have a curved surface portion having a bending angle α of more than 90 ° and 180 ° or less. However, the 3D cover glass molded by the 3D cover glass molding die of the present embodiment is bent only at any two adjacent sides and one corner connecting the two sides among the four sides. The angle α may be more than 90 ° and 180 ° or less. Here, the corner portion refers to a portion where the radius of curvature of the outer edge is 100 mm or less when viewed from the normal direction of the center portion.
 さらに、本実施形態の3Dカバーガラス成形用金型により成形される3Dカバーガラスは、4辺のうち、任意の3辺と、該3辺のうち隣り合ういずれか2辺を繋ぐ少なくとも1つの角部に、曲げ角度αが90°超180°以下の曲面部を有してもよい。 Furthermore, the 3D cover glass molded by the 3D cover glass molding die of the present embodiment has at least one corner connecting any three of the four sides and any two adjacent sides of the three sides. The portion may have a curved surface portion having a bending angle α of more than 90 ° and 180 ° or less.
 また、図2に示す3Dカバーガラス100は、中心部110の全周辺にわたって曲げ角度αが90°超180°以下の曲面部120が設けられている。しかし、この例に限らず、本実施形態の3Dカバーガラス成形用金型により成形される3Dカバーガラスは、4辺のうちいずれか2辺を繋ぐ少なくとも1つの角部に曲げ角度αが90°超180°以下の曲面部を有してもよい。 The 3D cover glass 100 shown in FIG. 2 is provided with a curved surface portion 120 having a bending angle α of more than 90 ° and 180 ° or less over the entire periphery of the central portion 110. However, not limited to this example, the 3D cover glass formed by the 3D cover glass forming mold of the present embodiment has a bending angle α of 90 ° at at least one corner connecting any two of the four sides. It may have a curved surface portion of super 180 ° or less.
 また、本実施形態の3Dカバーガラス成形用金型により成形される3Dカバーガラスは、4つの辺のうち、隣り合う任意の2辺を繋ぐ1つの角部と、該2辺のうちの1辺にのみ、曲げ角度αが90°超180°以下の曲面部を有してもよい。 Further, the 3D cover glass molded by the 3D cover glass molding die of the present embodiment has one corner connecting any two adjacent sides among four sides, and one side of the two sides. May have a curved surface portion having a bending angle α of more than 90 ° and 180 ° or less.
 また、本実施形態の3Dカバーガラス成形用金型により成形される3Dカバーガラス100は、4つの辺のうち、隣り合う任意の2辺と、該2辺を繋ぐ1つの角部にのみ、曲げ角度αが90°超180°以下の曲面部を有してもよい。 In addition, the 3D cover glass 100 molded by the 3D cover glass molding die of the present embodiment is bent only at any two adjacent sides of the four sides and at one corner connecting the two sides. The angle α may be more than 90 ° and 180 ° or less.
 また、本実施形態の3Dカバーガラス成形用金型により成形される3Dカバーガラス100は、4つの辺のうち、隣り合う任意の2辺を繋ぐ1つの角部と、該2辺と異なる隣り合う任意の2辺を繋ぐ1つの角部にのみ、曲げ角度αが90°超180°以下の曲面部を有してもよい。 In addition, the 3D cover glass 100 molded by the 3D cover glass molding die of the present embodiment has one corner connecting any two adjacent sides among the four sides, and an adjacent corner different from the two sides. Only one corner connecting any two sides may have a curved portion having a bending angle α of more than 90 ° and 180 ° or less.
 また、本実施形態の3Dカバーガラス成形用金型により成形される3Dカバーガラス100は、4つの辺のうち、3辺を繋ぐ2つの角部と、該3辺のうちいずれか1辺にのみまたは2辺にのみ、曲げ角度αが90°超180°以下の曲面部を有してもよい。 In addition, the 3D cover glass 100 molded by the 3D cover glass molding die of the present embodiment has two corners connecting three sides among four sides and only one of the three sides. Alternatively, only two sides may have a curved surface portion having a bending angle α of more than 90 ° and 180 ° or less.
 また、本実施形態の3Dカバーガラス成形用金型により成形される3Dカバーガラス100は、4つの辺のうち、3辺を繋ぐ2つの角部と、該3辺にのみ、曲げ角度αが90°超180°以下の曲面部を有してもよい。 The 3D cover glass 100 molded by the 3D cover glass molding die of the present embodiment has two corners connecting the three sides among the four sides, and the bending angle α is 90 at only the three sides. It may have a curved surface part exceeding 180 ° or less.
 また、本実施形態の3Dカバーガラス成形用金型により成形される3Dカバーガラス100は、任意の3つの角部にのみ、曲げ角度αが90°超180°以下の曲面部を有してもよい。 In addition, the 3D cover glass 100 formed by the 3D cover glass forming mold of the present embodiment may have a curved surface portion having a bending angle α of more than 90 ° and 180 ° or less only at arbitrary three corner portions. Good.
 また、本実施形態の3Dカバーガラス成形用金型により成形される3Dカバーガラス100は、任意の3つの角部と、4辺のうちいずれか1辺にのみ、もしくは2辺にのみ、あるいは3辺にのみ、曲げ角度αが90°超180°以下の曲面部を有してもよい。 The 3D cover glass 100 molded by the 3D cover glass molding die of the present embodiment has three arbitrary corners and only one of four sides, or only two sides, or three. A curved surface having a bending angle α of more than 90 ° and 180 ° or less may be provided only on the sides.
 また、本実施形態の3Dカバーガラス成形用金型により成形される3Dカバーガラス100は、任意の3つの角部と、4辺にのみ曲げ角度αが90°超180°以下の曲面部を有してもよい。 The 3D cover glass 100 molded by the 3D cover glass molding die of the present embodiment has three arbitrary corners and a curved surface having a bending angle α of more than 90 ° and 180 ° or less on only four sides. May be.
 また、本実施形態の3Dカバーガラス成形用金型により成形される3Dカバーガラス100は、4つの角部にのみ、曲げ角度αが90°超180°以下の曲面部を有してもよい。 In addition, the 3D cover glass 100 molded by the 3D cover glass molding die of the present embodiment may have a curved surface having a bending angle α of more than 90 ° and 180 ° or less only at four corners.
 なお、上記で、角度αが90°超180°以下と特定した曲面部以外の曲面部の曲げ角度は、90°以下である。 In addition, the bending angle of the curved surface portion other than the curved surface portion specified as having the angle α of more than 90 ° and 180 ° or less is 90 ° or less.
 また、図2に示す3Dカバーガラスは、平面形状が四角形であるが、本実施形態の3Dカバーガラス成形用金型により成形される3Dカバーガラスの平面形状は、四角形に限定されず、三角形、五角形、六角形、八角形等、四角形以外の多角形でもよい。なお、ここでいう多角形とは、角部が丸みを帯びた部分があるものも含む。別の言い方をすると、3Dカバーガラスの平面形状において、角部に曲線部分を含む場合であっても、該平面形状のうち、直線と、該直線を延長した仮想直線によって得られる形状が多角形であれば、「多角形」の対象とする。なお、3Dカバーガラスの平面形状が多角形であり、その全周において曲面部を有する場合、当該多角形の全ての角部に丸みを帯びる部分を有する場合が多い。なお、平面視で多角形の形状の場合も「角部」は、上記と同様に、中心部の法線方向から見たとき、外縁の曲率半径が100mm以下の部分とする。
 また、本実施形態の3Dカバーガラス成形用金型により成形される3Dカバーガラスは、平面形状が、2つの直線を繋ぐ少なくとも1つの角部を有していればよい。
The planar shape of the 3D cover glass illustrated in FIG. 2 is a square, but the planar shape of the 3D cover glass formed by the 3D cover glass molding die of the present embodiment is not limited to a quadrangle, and may be a triangle, A polygon other than a quadrangle, such as a pentagon, a hexagon, and an octagon, may be used. Here, the polygon includes a polygon having a part with a rounded corner. In other words, in the planar shape of the 3D cover glass, even when a curved portion is included in a corner, a shape obtained by a straight line and a virtual straight line obtained by extending the straight line in the planar shape is a polygon. If so, the object is a "polygon". In the case where the planar shape of the 3D cover glass is a polygon and has a curved surface around the entire circumference, the polygon often has a rounded portion at all corners of the polygon. In the case of a polygonal shape in a plan view as well, the “corner” is a portion where the radius of curvature of the outer edge is 100 mm or less when viewed from the direction of the normal to the center similarly to the above.
The 3D cover glass molded by the 3D cover glass molding die of the present embodiment may have a planar shape having at least one corner connecting two straight lines.
 図4は、本実施形態の3Dカバーガラス成形用金型の一構成例を示した分解斜視図であり、図5は、図4に示す3Dカバーガラス成形用金型の部分拡大図である。図6は、図4に示す3Dカバーガラス成形用金型の組立図である。図7は、図6に示す3Dカバーガラス成形用金型の断面Aでの断面図であり、図8は、図6に示す3Dカバーガラス成形用金型の断面Bでの断面図である。 FIG. 4 is an exploded perspective view showing an example of the configuration of the 3D cover glass molding die of the present embodiment, and FIG. 5 is a partially enlarged view of the 3D cover glass molding die shown in FIG. FIG. 6 is an assembly diagram of the 3D cover glass molding die shown in FIG. FIG. 7 is a cross-sectional view of the 3D cover glass molding die shown in FIG. 6 at a cross section A, and FIG. 8 is a cross-sectional view of the 3D cover glass molding die shown in FIG. 6 at a cross section B.
 図4~図8に示す構成例における3Dカバーガラス成形用金型は、主成形用金型20、底型30、上型40およびアライメント板50を有し、図2及び3に示す3Dカバーガラス100の成形に使用できる。但し、本実施形態の3Dカバーガラス成形用金型において、主成形用金型20のみが必須の構成要素であり、後述するように、真空吸引によってガラスが成形できれば、底型30、上型40およびアライメント板50は任意の構成要素である。 The 3D cover glass molding die in the configuration example shown in FIGS. 4 to 8 includes a main molding die 20, a bottom die 30, an upper die 40, and an alignment plate 50, and the 3D cover glass shown in FIGS. 100 can be used for molding. However, in the 3D cover glass molding die of the present embodiment, only the main molding die 20 is an essential component. As will be described later, if the glass can be molded by vacuum suction, the bottom mold 30 and the upper mold 40 are formed. The alignment plate 50 is an optional component.
(主成形用金型)
 主成形用金型20は中心部21が平坦で、中心部21の周辺に3次元曲面をなす曲面部22を有する。これら中心部21および曲面部22により、凹部23が構成される。以下、本明細書において、主成形用金型の曲面部と記載した場合、3次元曲面形状をなす曲面部を指す。ここで、平坦とは、曲率半径が100mm超であることを意味する。すなわち、主成形用金型の中心部とは、凹部の中心を含み、曲率半径が100mm超である連続した領域である。主成形用金型の中心部により、3Dカバーガラスの中心部が成形される。
 また、曲面部とは、主成形用金型20の中心部21の平面と直交する断面における曲率半径が、100mm以下の部分、及び当該部分と端部28の間の領域をあわせた部分を指す。すなわち、中心部21の外縁から端部28までの領域が曲面部である。曲面部の曲率半径は一定でなくてもよく、また、曲面部は比較的平坦な部分を含んでいてもよい。主成形用金型の曲面部により、3Dカバーガラスの曲面部が成形される。
 また、本明細書において主成形用金型の曲面部について中心部の平面を基準としたときの接線の角度という場合は、中心部の中心に接する平面と、曲面部における接線と、がなす角度である。より詳細には、中心部の平面を基準としたときの接線の角度とは、主成形用金型の中心部の平面と直交する断面における、曲面部上の点を点A、中心部の中心を点B、点Aにおける接線と点Bにおける接線との交点を点Cとした際に、曲げ角度は180°-∠ACBで表される。また、点Aが端部であるときの当該角度が「中心部の平面を基準としたときの接線の最大角度」である。
 なお、曲げ角度を指定せずに単に「曲面部」という場合は、中心部の平面を基準としたときの接線の最大角度が90°超180°以下の曲面部、および90°以下の曲面部の両方を包含する。
(Main molding die)
The main molding die 20 has a flat central portion 21 and a curved surface portion 22 that forms a three-dimensional curved surface around the central portion 21. The central portion 21 and the curved surface portion 22 form a concave portion 23. Hereinafter, in the present specification, the term “curved surface portion of the main molding die” indicates a curved surface portion having a three-dimensional curved surface shape. Here, flat means that the radius of curvature is greater than 100 mm. That is, the central portion of the main molding die is a continuous region including the center of the concave portion and having a radius of curvature exceeding 100 mm. The central part of the 3D cover glass is molded by the central part of the main molding die.
Further, the curved surface portion refers to a portion having a radius of curvature of 100 mm or less in a cross section orthogonal to the plane of the center portion 21 of the main molding die 20 and a portion in which a region between the portion and the end portion 28 is combined. . That is, a region from the outer edge of the center portion 21 to the end portion 28 is a curved surface portion. The radius of curvature of the curved portion may not be constant, and the curved portion may include a relatively flat portion. The curved surface of the 3D cover glass is formed by the curved surface of the main molding die.
Also, in this specification, the angle of a tangent to the curved surface portion of the main molding die with reference to the center plane is an angle formed by a plane tangent to the center of the central portion and a tangent line in the curved surface portion. It is. More specifically, the angle of the tangent with respect to the plane of the center is defined as a point A on the curved surface in a cross section orthogonal to the plane of the center of the main molding die, and the center of the center. Is the point B, and the intersection of the tangent at the point A and the tangent at the point B is the point C, the bending angle is expressed by 180 ° -∠ACB. Further, the angle when the point A is the end is the “maximum tangent angle with respect to the center plane”.
In addition, when the “curved surface portion” is simply referred to without specifying the bending angle, the maximum tangent angle with respect to the center plane is more than 90 ° and 180 ° or less, and 90 ° or less curved surface portion. And both.
 図示した主成形用金型20は、中心部21の全周辺にわたって曲面部22を有する。しかし、この例に限らず、本実施形態の3Dカバーガラス成形用金型の主成形用金型は、凹部の平面形状における4辺のうちいずれか2辺と、該2辺を繋ぐ少なくとも1つの角部に、中心部21の平面を基準としたときの接線の最大角度が90°超180°以下の曲面部を有していればよい。 主 The illustrated main molding die 20 has a curved surface portion 22 over the entire periphery of the central portion 21. However, the present invention is not limited to this example. The main molding die of the 3D cover glass molding die of the present embodiment may include any two sides among the four sides in the planar shape of the concave portion and at least one side connecting the two sides. It is only necessary that the corner has a curved surface having a maximum tangent angle of more than 90 ° and 180 ° or less with respect to the plane of the central portion 21.
 例えば、本実施形態の3Dカバーガラス成形用金型の主成形用金型は、凹部の平面形状における4つの辺のうち、隣り合う任意の2辺と、該2辺を繋ぐ1つの角部にのみ、中心部21の平面を基準としたときの接線の最大角度が90°超180°以下の曲面部を有してもよい。 For example, the main molding die of the 3D cover glass molding die of the present embodiment includes two adjacent sides among four sides in the planar shape of the concave portion and one corner connecting the two sides. Only, the maximum angle of the tangent with respect to the plane of the central portion 21 may be more than 90 ° and 180 ° or less.
 さらに、本実施形態の3Dカバーガラス成形用金型の主成形用金型は、凹部の平面形状における4辺のうち、任意の3辺と、該3辺のうち隣り合ういずれか2辺を繋ぐ少なくとも1つの角部に、中心部21の平面を基準としたときの接線の最大角度が90°超180°以下の曲面部を有してもよい。 Furthermore, the main molding die of the 3D cover glass molding die of the present embodiment connects any three of the four sides in the planar shape of the concave portion and any two adjacent sides of the three sides. At least one corner may have a curved surface having a maximum tangent angle of more than 90 ° and 180 ° or less with respect to the plane of the central portion 21.
 図2及び3に示す3Dカバーガラス100は、曲面部120の曲げ角度αが180°であるため、図示した主成形用金型20の曲面部22は、中心部21の平面を基準としたときの接線の角度が180°まで連続している。しかし、本実施形態の3Dカバーガラス成形用金型の主成形用金型の曲面部は、成形対象の3Dカバーガラスの曲面部の曲げ角度に応じて、中心部の平面を基準としたときの接線の角度が90°超180°以下まで連続していればよい。以下、中心部の平面を基準としたときの、接線の角度が90°超180°以下まで連続している曲面部のことを、接線の最大角度が90°超180°以下の曲面部と記載する。 In the 3D cover glass 100 illustrated in FIGS. 2 and 3, since the bending angle α of the curved surface portion 120 is 180 °, the illustrated curved surface portion 22 of the main molding die 20 is based on the plane of the central portion 21. Are continuous up to 180 °. However, the curved surface portion of the main molding die of the 3D cover glass molding die of the present embodiment is based on the plane of the central portion according to the bending angle of the curved surface portion of the 3D cover glass to be molded. The angle of the tangent may be continuous from more than 90 ° to 180 ° or less. Hereinafter, a curved surface portion in which the angle of the tangent is continuous from more than 90 ° to 180 ° or less based on the plane of the center portion is referred to as a curved surface portion in which the maximum angle of the tangent is more than 90 ° and 180 ° or less. I do.
 また、本実施形態の3Dカバーガラス成形用金型の主成形用金型は、平面視における凹部の外縁のうち、少なくとも、2つの直線を繋ぐ少なくとも1つの角部に、中心部21の平面を基準としたときの接線の最大角度が90°超180°以下の曲面部を有していればよい。なお、主成形用金型において、角部とは、平面視における凹部の外縁において、曲率半径が100mm以下の部分を指す。そして、直線部とは、平面視における凹部の外縁において、曲率半径が100mm超の部分を指す。なお、凹部23の外縁とは、平面視において凹部が最も外側に位置する部分に相当する。したがって、平面視における凹部の外縁とは、主成形用金型20の中心部21の平面を基準としたときの接線の最大角度が90°超の曲面部22を有する場合、該接線の角度が90°となる位置を繋げてできる線に相当する。 In addition, the main molding die of the 3D cover glass molding die of the present embodiment is configured such that, among the outer edges of the concave portion in a plan view, at least one corner connecting two straight lines has the plane of the central portion 21 at least. It is sufficient that the tangent has a curved surface portion having a maximum angle of 90 ° or more and 180 ° or less as a reference. In the main molding die, the corner portion refers to a portion having a radius of curvature of 100 mm or less at the outer edge of the concave portion in plan view. The linear portion refers to a portion having a radius of curvature exceeding 100 mm at the outer edge of the concave portion in plan view. Note that the outer edge of the concave portion 23 corresponds to a portion where the concave portion is located on the outermost side in a plan view. Therefore, when the outer edge of the concave portion in plan view has a curved surface portion 22 having a maximum tangent angle of more than 90 ° with respect to the plane of the central portion 21 of the main molding die 20, the angle of the tangent angle is This corresponds to a line formed by connecting positions at 90 °.
 例えば、本実施形態における主成形用金型20の凹部23は、4つの辺のうち、隣り合う任意の2辺を繋ぐ1つの角部にのみ、中心部21の平面を基準としたときの接線の最大角度が90°超180°以下の曲面部を有してもよい。 For example, the concave portion 23 of the main molding die 20 in the present embodiment has a tangent to only one corner connecting any two adjacent sides of the four sides with respect to the plane of the central portion 21. May have a curved surface portion having a maximum angle of more than 90 ° and 180 ° or less.
 また、本実施形態における主成形用金型20の凹部23は、4つの辺のうち、隣り合う任意の2辺を繋ぐ1つの角部と、該2辺のうち1辺にのみ、中心部21の平面を基準としたときの接線の最大角度が90°超180°以下の曲面部を有してもよい。 In addition, the concave portion 23 of the main molding die 20 in the present embodiment has one corner portion connecting any two adjacent sides among the four sides, and the center portion 21 only on one side of the two sides. May have a curved surface portion having a maximum tangent angle of more than 90 ° and 180 ° or less with respect to the flat surface.
 また、本実施形態における主成形用金型20の凹部23は、4つの辺のうち、隣り合う任意の2辺と、該2辺を繋ぐ1つの角部にのみ、中心部21の平面を基準としたときの接線の最大角度が90°超180°以下の曲面部を有してもよい。 In addition, the recessed portion 23 of the main molding die 20 in the present embodiment is based on the plane of the central portion 21 only in any two adjacent sides and one corner connecting the two sides among the four sides. The maximum angle of the tangent may be more than 90 ° and 180 ° or less.
 また、本実施形態における主成形用金型20の凹部23は、4つの辺のうち、隣り合う任意の2辺を繋ぐ1つの角部と、該2辺と異なる隣り合う任意の2辺を繋ぐ1つの角部にのみ、中心部21の平面を基準としたときの接線の最大角度が90°超180°以下の曲面部を有してもよい。 In addition, the concave portion 23 of the main molding die 20 in the present embodiment connects one corner portion connecting any two adjacent sides of the four sides to any two adjacent sides different from the two sides. Only one corner may have a curved surface having a maximum tangent angle of more than 90 ° and 180 ° or less with respect to the plane of the central portion 21.
 また、本実施形態における主成形用金型20の凹部23は、4つの辺のうち、3辺を繋ぐ2つの角部と、該3辺のうちいずれか1辺または2辺にのみ、中心部21の平面を基準としたときの曲げ角度αが90°超180°以下の曲面部を有してもよい。 In addition, the concave portion 23 of the main molding die 20 in the present embodiment has two corner portions connecting the three sides of the four sides, and only one or two of the three sides has the central portion. 21 may have a curved surface part having a bending angle α of more than 90 ° and 180 ° or less.
 また、本実施形態における主成形用金型20の凹部23は、4つの辺のうち、3辺を繋ぐ2つの角部と、該3辺にのみ、中心部21の平面を基準としたときの接線の最大角度が90°超180°以下の曲面部を有してもよい。 In addition, the concave portion 23 of the main molding die 20 in the present embodiment has two corners connecting three sides of the four sides, and only the three sides are based on the plane of the central portion 21. The tangent may have a curved portion having a maximum angle of more than 90 ° and 180 ° or less.
 また、本実施形態における主成形用金型20の凹部23は、任意の3つの角部にのみ、中心部21の平面を基準としたときの接線の最大角度が90°超180°以下の曲面部を有してもよい。 In addition, the concave portion 23 of the main molding die 20 in the present embodiment has a curved surface having a maximum tangent angle of more than 90 ° and not more than 180 ° at only three arbitrary corners with respect to the plane of the central portion 21. It may have a part.
 また、本実施形態における主成形用金型20の凹部23は、任意の3つの角部と、4辺のうちいずれか1辺(もしくは2辺、あるいは3辺)にのみ、中心部21の平面を基準としたときの接線の最大角度が90°超180°以下の曲面部を有してもよい。 In addition, the concave portion 23 of the main molding die 20 according to the present embodiment is formed such that only three arbitrary corners and one of the four sides (or two or three sides) have the flat surface of the central portion 21. May have a curved surface portion having a maximum angle of a tangent line of more than 90 ° and 180 ° or less with respect to.
 また、本実施形態における主成形用金型20の凹部23は、任意の3つの角部と、4辺にのみ、中心部21の平面を基準としたときの接線の最大角度が90°超180°以下の曲面部を有してもよい。 In addition, the concave portion 23 of the main molding die 20 according to the present embodiment has a maximum tangent angle of more than 90 ° with respect to the plane of the central portion 21 only at any three corners and four sides. ° or less.
 また、本実施形態における主成形用金型20の凹部23は、4つの角部にのみ、中心部21の平面を基準としたときの接線の最大角度が90°超180°以下の曲面部を有してもよい。 In addition, the concave portion 23 of the main molding die 20 in the present embodiment has a curved surface portion having a maximum angle of a tangent of more than 90 ° and 180 ° or less with respect to the plane of the central portion 21 only at four corners. May have.
 上記で特定した、中心部21の平面を基準としたときの接線の最大角度が90°超180°以下の曲面部以外の曲面部は、接線の最大角度が90°以下である。 曲 The maximum tangent angle of the curved surface portion other than the curved surface portion having a maximum tangent angle of more than 90 ° and not more than 180 ° with respect to the plane of the central portion 21 specified above is 90 ° or less.
 また、図示した主成形用金型20は、平面視における凹部23の外縁が四角形であるが、本実施形態における主成形用金型の平面視における凹部の外縁形状は四角形に限定されず、三角形、五角形、六角形、八角形等、四角形以外の多角形でもよい。なお、凹部23の外縁とは、平面視において凹部が最も外側に位置する部分に相当する。例えば、主成形用金型20が、中心部21の全周辺にわたって中心部21の平面を基準としたときの接線の最大角度が90°超の曲面部22を有する場合、該接線の角度が90°となる位置を全周にわたって繋げてできる線が外縁に相当する。 Further, in the illustrated main molding die 20, the outer edge of the concave portion 23 in a plan view is rectangular, but the outer peripheral shape of the concave portion in plan view of the main molding die in the present embodiment is not limited to a quadrangle. , Pentagons, hexagons, octagons, and other polygons other than rectangles. Note that the outer edge of the concave portion 23 corresponds to a portion where the concave portion is located on the outermost side in a plan view. For example, when the main molding die 20 has a curved portion 22 having a maximum tangent angle of more than 90 ° with respect to the plane of the central portion 21 over the entire periphery of the central portion 21, the angle of the tangent is 90 °. The line formed by connecting the positions of ° over the entire circumference corresponds to the outer edge.
 図4及び5に示すように、中心部21の平面を基準としたときの接線の最大角度が90°超180°以下の曲面部22を有する角部24は、接線の角度が最大となる位置から中心部21の端部まで連続する溝部25を有しており、該溝部25は、主成形用金型20が有する貫通孔26と接続している。溝部25、および貫通孔26は、図8の矢印で示すように、3Dカバーガラスを成形する際に真空吸引の経路となる。本実施形態の3Dカバーガラス成形用金型は、真空吸引時に、ガラスが金型に倣うのが最も遅く成形しにくい角部24に、貫通孔26と接続する溝部25が設けられている。そのため、ガラスを、角部を含む主成形用金型の凹部全面にわたって確実に密着させて成形できる。 As shown in FIGS. 4 and 5, the corner 24 having the curved surface portion 22 having a maximum tangent angle of more than 90 ° and 180 ° or less with respect to the plane of the central portion 21 is located at a position where the tangent angle is the maximum. From the center part 21 to the end of the central part 21, and the groove 25 is connected to the through hole 26 of the main molding die 20. As shown by arrows in FIG. 8, the groove 25 and the through-hole 26 serve as a vacuum suction path when forming a 3D cover glass. In the mold for forming a 3D cover glass according to the present embodiment, a groove portion 25 connected to the through hole 26 is provided at a corner portion 24 where glass is the slowest to follow the mold during vacuum suction and is difficult to mold. For this reason, the glass can be reliably formed in close contact with the entire concave portion of the main molding die including the corners.
 図4に示した主成形用金型20は、中心部21の全周辺にわたって、中心部21の平面を基準としたときの接線の最大角度が90°超180°以下の曲面部22を有しているため、図中、4か所の角部すべてに、接線の角度が最大となる位置から、中心部21の端部まで連続する溝部と、該溝部と接続する貫通孔が設けられている。
 なお、図5では、1か所の角部に1つの溝部25が設けられているが、1か所の角部に2つ以上の溝部を設けてもよい。その場合、溝部は、1つの経路から複数の経路に分岐する構造でもよく、独立に複数本設ける構造でもよい。
The main molding die 20 shown in FIG. 4 has a curved surface portion 22 having a maximum tangent angle of more than 90 ° and 180 ° or less with respect to the plane of the central portion 21 over the entire periphery of the central portion 21. Therefore, in the figure, all four corners are provided with a groove part continuous from the position where the angle of the tangent is maximum to the end of the center part 21 and a through hole connected to the groove part. .
In FIG. 5, one groove 25 is provided at one corner, but two or more grooves may be provided at one corner. In this case, the groove may have a structure that branches from one path to a plurality of paths, or a structure in which a plurality of grooves are independently provided.
 また、主成形用金型20は、図4に示すように、中心部21の平面と平行方向に分割可能である。主成形用金型20を、中心部21の平面と平行方向に分割することにより、曲面部の曲げ角度αが90°超180°以下の3Dカバーガラスを成形後、該3Dカバーガラスを容易に取り出せる。また、分割可能な主成形用金型20は、複数の部分金型を組み立てた状態において、部分金型どうしが隣接してできる境界に相当する分割線を有する。 The main molding die 20 can be divided in the direction parallel to the plane of the central part 21 as shown in FIG. By dividing the main molding die 20 in a direction parallel to the plane of the central portion 21, a 3D cover glass having a curved portion having a bending angle α of more than 90 ° and not more than 180 ° can be easily formed. Can be taken out. Further, the main molding die 20 that can be divided has a dividing line corresponding to a boundary formed between adjacent partial dies when a plurality of partial dies are assembled.
 以下、主成形用金型における分割線の位置の好ましい条件について説明する。
 まず、主成形用金型の曲面部を避けて分割線を配置できない場合について説明する。例えば図4に示す主成形用金型20のように、中心部の全周辺にわたって曲面部を有する場合は、曲面部を避けて分割線を配置できない。
 この場合は、曲面部の直線部を避けて分割線を配置すること、すなわち、中心部及び曲面部の角部に分割線を配置することが好ましい。中心部に分割線を配置するのが好ましいのは、分割線が3Dカバーガラスの中心部に転写されても研削研磨による修復が容易であるためである。また、曲面部の角部に分割線を配置するのが好ましいのは、3Dカバーガラスの曲面部の角部は表示部分として使用される可能性が低いため、また、表示部分として使用される場合でも面積が小さく転写による欠点が目立たないためである。
Hereinafter, preferable conditions of the position of the dividing line in the main molding die will be described.
First, a case where the dividing line cannot be arranged avoiding the curved surface portion of the main molding die will be described. For example, in the case where the main molding die 20 shown in FIG. 4 has a curved portion over the entire periphery of the central portion, the dividing line cannot be arranged avoiding the curved portion.
In this case, it is preferable to arrange the dividing line avoiding the straight portion of the curved surface portion, that is, to arrange the dividing line at the center portion and the corner of the curved surface portion. The reason why the dividing line is preferably arranged at the center is that even if the dividing line is transferred to the center of the 3D cover glass, the dividing line can be easily repaired by grinding and polishing. In addition, it is preferable that the dividing line is arranged at the corner of the curved surface because the corner of the curved surface of the 3D cover glass is unlikely to be used as a display part, and when it is used as a display part. However, this is because the area is small and defects due to transfer are inconspicuous.
 次に、主成形用金型の曲面部を避けて分割線を配置できる場合について説明する。例えば、主成形用金型の凹部の角部にのみ曲面部が配置されるような場合は、曲面部を避けて分割線を配置できる。
 この場合は、分割線は中心部のみに設けられることが好ましい。これは、分割線が3Dカバーガラスの中心部に転写されても研削研磨による修復が容易であるためである。
Next, a case where the dividing line can be arranged avoiding the curved surface portion of the main molding die will be described. For example, in the case where the curved surface is arranged only at the corner of the concave portion of the main molding die, the dividing line can be arranged avoiding the curved surface.
In this case, the dividing line is preferably provided only at the center. This is because even if the dividing line is transferred to the central part of the 3D cover glass, the restoration by grinding and polishing is easy.
 また、主成形用金型20は、曲面部22の接線の角度が最大となる端部28から、外側に沿って、中心部21の平面と平行する面に対して3°~30°の傾斜をなす傾斜部27を有するとよい。成形後の3Dカバーガラスは、曲面部の外側に裾部(最終的に切除される部分)を有する場合があるが、このような場合、3Dカバーガラスの裾部と曲面部により主成形用金型20の曲面部22の端部28が挟み込まれ、3Dカバーガラスの取り出しが容易に行えなくなる恐れがある。しかし、上記のような傾斜部27を設けることにより、この挟み込みの発生が抑制されるため、成形後の3Dカバーガラスの取り出しを容易にできる。また、傾斜部27のなす傾斜は、中心部21の平面と平行する面に対して4°~25°が好ましく、5°~20°がより好ましい。傾斜部の幅は、平面視において1mm~15mmであればよく、2mm~10mmが好ましい。 Further, the main molding die 20 is inclined from the end 28 at which the angle of the tangent of the curved surface portion 22 is maximum to the surface parallel to the plane of the central portion 21 by 3 ° to 30 ° along the outside. It is good to have the inclined part 27 which makes the following. The molded 3D cover glass may have a hem (a part to be finally cut off) outside the curved surface in some cases. In such a case, the main molding metal is formed by the hem and the curved surface of the 3D cover glass. The end portion 28 of the curved surface portion 22 of the mold 20 may be pinched, and the 3D cover glass may not be easily taken out. However, by providing the above-described inclined portion 27, the occurrence of the entrapment is suppressed, so that the molded 3D cover glass can be easily taken out. The inclination of the inclined portion 27 is preferably 4 ° to 25 ° with respect to a plane parallel to the plane of the central portion 21, and more preferably 5 ° to 20 °. The width of the inclined portion may be 1 mm to 15 mm in plan view, and is preferably 2 mm to 10 mm.
(底型)
 底型30は、主成形用金型20の凹部を有さない側に配置される。底型30は、その中心部に、周辺よりも低い位置となる段差部31を有し、該段差部31の重心を含む位置に吸引用の穴32を有する。図7及び8に示すように、吸引用の穴32は、段差部31を介して主成形用金型20の貫通孔26と接続し、3Dカバーガラスを成形する際に、主成形用金型20の溝部25、貫通孔26、底型30の段差部31、及び吸引用の穴32により真空吸引の経路が構成される。
(Bottom type)
The bottom mold 30 is arranged on the side of the main molding die 20 that does not have a recess. The bottom mold 30 has a step portion 31 at a central portion thereof at a position lower than the periphery, and a suction hole 32 at a position including the center of gravity of the step portion 31. As shown in FIGS. 7 and 8, the suction hole 32 is connected to the through-hole 26 of the main molding die 20 via the stepped portion 31, and when the 3D cover glass is molded, the main molding die is used. A groove for vacuum suction is formed by the groove 25 of 20, the through hole 26, the step 31 of the bottom mold 30, and the hole 32 for suction.
 但し、底型における吸引用の穴は、図示した配置に限定されない。例えば、底型の中心部に段差部を有しておらず、主成形用金型の貫通孔の直下、すなわち、底型の四隅に吸引用の穴を有していてもよい。
 また、本3Dカバーガラス成形用金型は、底型を有さなくてもよい。この場合、主成形用金型の貫通孔から直接真空吸引する。但し、底型を有すると、真空吸引の経路を1か所に集約できる。そのため、設備と型との接合箇所が1か所となり、設備側の真空吸引のための構造も1か所となる。そのため、設備の簡素化が可能である。また、型内部に真空チャンバーが存在する構造となるため、均一な真空吸引が可能となる。
However, the suction holes in the bottom mold are not limited to the illustrated arrangement. For example, the bottom portion may not have a step portion at the center portion, and may have suction holes directly below the through holes of the main molding die, that is, at four corners of the bottom die.
Also, the present 3D cover glass molding die need not have a bottom die. In this case, vacuum suction is performed directly through the through hole of the main molding die. However, having a bottom mold allows the vacuum suction path to be concentrated in one place. Therefore, there is only one joint between the equipment and the mold, and the structure for vacuum suction on the equipment side is also one. Therefore, the equipment can be simplified. In addition, since a vacuum chamber is provided inside the mold, uniform vacuum suction can be performed.
(上型)
 上型40は、主成形用金型20の凹部23を有する側に配置される。本実施形態の3Dカバーガラス成形用金型は、上型を有さなくてもよいが、主成形用金型20を上型40で覆うと、ガラスを上下方向から効率的に加熱できる。そのため、ガラスの板厚方向に温度差が生じにくく、加熱中の熱変形を抑制できる。さらに、真空吸着のタイミングでガラスの端部(エッジ)は、その反力で真空吸着される方向とは逆方向に跳ね上がって真空が破壊されるおそれがあるが、上型があることでその現象を抑制できる。そのため、上型があると、3Dカバーガラスを成形する際に真空吸引をより効果的に実施できる。上型40は、主成形用金型20の上面を完全に覆う構成が好ましい。
(Upper type)
The upper mold 40 is arranged on the side of the main molding die 20 having the concave portion 23. Although the 3D cover glass molding die of the present embodiment does not need to have an upper die, when the main molding die 20 is covered with the upper die 40, the glass can be efficiently heated from above and below. Therefore, a temperature difference hardly occurs in the thickness direction of the glass, and thermal deformation during heating can be suppressed. Furthermore, at the timing of vacuum suction, the edge of the glass may jump up in a direction opposite to the direction of vacuum suction due to the reaction force and break the vacuum, but the phenomenon is caused by the presence of the upper die. Can be suppressed. Therefore, if there is an upper mold, vacuum suction can be more effectively performed when forming a 3D cover glass. It is preferable that the upper mold 40 completely covers the upper surface of the main molding die 20.
(アライメント板)
 リング形状のアライメント板50は、主成形用金型20の凹部23を有する側に配置される。アライメント板50のリング形状の内縁は、平面視において主成形用金型20の凹部23の外縁よりも外側にある。本実施形態の3Dカバーガラス成形用金型は、アライメント板を有さなくてもよいが、アライメント板50を配置することで、3Dカバーガラスを成形する際に、主成形用金型20上に平面状のガラス板200を載置する際の位置決めが容易になる。つまり、アライメント板50を有することで、位置決めのばらつきを安定させる効果があり、量産時に歩留りが向上する。
(Alignment plate)
The ring-shaped alignment plate 50 is disposed on the side of the main molding die 20 having the concave portion 23. The ring-shaped inner edge of the alignment plate 50 is located outside the outer edge of the concave portion 23 of the main molding die 20 in plan view. Although the 3D cover glass molding die of the present embodiment does not need to have an alignment plate, when the 3D cover glass is molded by disposing the alignment plate 50, the main molding die 20 is formed on the 3D cover glass molding die. Positioning when placing the flat glass plate 200 is facilitated. In other words, the presence of the alignment plate 50 has the effect of stabilizing the variation in positioning, and improves the yield during mass production.
 本実施形態の3Dカバーガラス成形用金型の使用手順の一例を図9~16を参照して説明する。
 図9は、底型30の平面図である。図10は、主成形用金型20の平面図である。図10の例において、主成形用金型20は、4つの角部にそれぞれに境界線を有するように、4つの部分金型に分割される構造を有する。図11に示すように、底型30上に主成形用金型20を組み立てると、部分金型でできる境界に分割線を有する状態で一体化する。次に、図12に示すように、主成形用金型20上にアライメント板50を載置する。次に、図13に示すように、主成形用金型20上に平面状のガラス板200を載置する。次に、図14に示すように、アライメント板50上に上型40をアライメント板50を覆うように固定する。図14に示す状態で、本実施形態の3Dカバーガラス成形用金型を加熱しながら、底型30の吸引用の穴32、段差部31、主成形用金型20の貫通孔26、角部24に設けられた溝部25を経由して真空吸引して、平面状のガラス板を3D形状に成形した後、冷却する。
An example of a procedure for using the 3D cover glass molding die of the present embodiment will be described with reference to FIGS.
FIG. 9 is a plan view of the bottom mold 30. FIG. 10 is a plan view of the main molding die 20. In the example of FIG. 10, the main molding die 20 has a structure that is divided into four partial dies so that each of the four corners has a boundary line. As shown in FIG. 11, when the main molding die 20 is assembled on the bottom die 30, they are integrated with a parting line at the boundary formed by the partial die. Next, as shown in FIG. 12, the alignment plate 50 is placed on the main molding die 20. Next, as shown in FIG. 13, a planar glass plate 200 is placed on the main molding die 20. Next, as shown in FIG. 14, the upper die 40 is fixed on the alignment plate 50 so as to cover the alignment plate 50. In the state shown in FIG. 14, while heating the 3D cover glass molding die of the present embodiment, the suction hole 32 of the bottom die 30, the step portion 31, the through hole 26 of the main molding die 20, and the corners. Vacuum suction is performed through a groove 25 provided in the 24 to form a flat glass plate into a 3D shape, and then cooled.
 冷却後、上型40を外し、アライメント板50を外した後、本3Dカバーガラス成形用金型を逆さにして、底型30から主成形用金型20を取り出し、主成形用金型20を3Dカバーガラスの中心部と平行方向に分割して、成形後の3Dカバーガラスを取り出す。
 図15は、3Dカバーガラスの成形前の、主成形用金型20上にガラス板200を載置した状態を示した斜視図であり、図16は、3Dカバーガラスの成形後、上型40を外した状態を示した斜視図である。
After cooling, the upper mold 40 is removed, the alignment plate 50 is removed, the 3D cover glass molding die is inverted, the main molding die 20 is taken out from the bottom die 30, and the main molding die 20 is removed. The 3D cover glass is divided in a direction parallel to the center of the 3D cover glass, and the molded 3D cover glass is taken out.
FIG. 15 is a perspective view showing a state where the glass plate 200 is placed on the main molding die 20 before molding of the 3D cover glass, and FIG. 16 is an upper mold 40 after molding of the 3D cover glass. It is the perspective view which showed the state which removed.
 成形後の3Dカバーガラスには、曲面部の外側に上述した裾部を有する場合がある。その場合、成形後の3Dカバーガラスの曲面部の外側にある裾部を切断して、所定の形状を有する3Dカバーガラスを画定する。なお、その後、3Dカバーガラスの表面(平面、曲面、端面)を研磨加工したり、所定の溶融塩に浸漬させてイオン交換をすることで、化学強化処理をしたりして、曲げ角度αが90°超180°以下の化学強化3Dカバーガラスを作製してもよい。 3 In some cases, the 3D cover glass after molding has the above-mentioned skirt portion outside the curved surface portion. In that case, a skirt portion outside the curved surface portion of the formed 3D cover glass is cut to define a 3D cover glass having a predetermined shape. After that, the surface (flat surface, curved surface, end surface) of the 3D cover glass is polished or immersed in a predetermined molten salt to perform ion exchange, thereby performing a chemical strengthening treatment, so that the bending angle α is reduced. A chemically strengthened 3D cover glass of more than 90 ° and 180 ° or less may be produced.
 本発明を特定の態様を参照して詳細に説明したが、本発明の精神と範囲を離れることなく様々な変更および修正が可能であることは、当業者にとって明らかである。なお、本出願は、2018年8月22付けで出願された日本特許出願(特願2018-155423)に基づいており、その全体が引用により援用される。また、ここに引用されるすべての参照は全体として取り込まれる。 Although the present invention has been described in detail with reference to particular 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 Aug. 22, 2018 (Japanese Patent Application No. 2018-155423), which is incorporated by reference in its entirety. Also, all references cited herein are incorporated in their entirety.
10:3Dカバーガラス成形用金型
20:主成形用金型
21:中心部
22:曲面部
23:凹部
24:角部
25:溝部
26:貫通孔
27:傾斜部
28:端部
30:底型
31:段差部
32:吸引用の穴
40:上型
50:アライメント板
100,300:3Dカバーガラス
110,310:中心部
120,320:曲面部
122:端部
200:ガラス板
10: 3D cover glass molding die 20: main molding die 21: central portion 22: curved surface portion 23: concave portion 24: corner portion 25: groove portion 26: through hole 27: inclined portion 28: end portion 30: bottom mold 31: step portion 32: suction hole 40: upper die 50: alignment plate 100, 300: 3D cover glass 110, 310: central portion 120, 320: curved portion 122: end portion 200: glass plate

Claims (12)

  1.  3Dカバーガラスを形成するための主成形用金型を有し、
     前記主成形用金型は、曲率半径が100mm超の中心部と、前記中心部の周辺の少なくとも一部に3次元曲面をなす曲面部を有し、前記中心部及び前記曲面部により凹部が形成され、
     前記曲面部の少なくとも一部は、前記中心部がなす平面を基準としたとき、接線の角度が90°超180°以下まで連続しており、
     かつ、前記接線の角度が90°超180°以下まで連続している曲面部は、前記中心部の法線方向から見たとき、前記凹部の外縁のうち、2つの隣り合う辺を繋ぎ曲率半径が100mm以下で定義される少なくとも1つの角部に形成され、
     前記角部は、前記接線の角度が最大となる位置から前記中心部の端部まで連続する溝部を有し、
     さらに、前記主成形用金型は、前記溝部と接続する貫通孔を有し、
     前記中心部の平面と平行方向に分割可能である、
     3Dカバーガラス成形用金型。
    Having a main mold for forming a 3D cover glass,
    The main molding die has a central portion having a curvature radius of more than 100 mm and a curved surface portion forming a three-dimensional curved surface in at least a part of the periphery of the central portion, and a concave portion is formed by the central portion and the curved surface portion. And
    At least a portion of the curved surface portion has a tangent angle of more than 90 ° and continuous to 180 ° or less, based on a plane formed by the central portion,
    In addition, the curved surface portion where the angle of the tangent is continuous from more than 90 ° to 180 ° or less, when viewed from the normal direction of the central portion, connects two adjacent sides of the outer edge of the concave portion and has a radius of curvature. Is formed on at least one corner defined by 100 mm or less;
    The corner has a groove continuous from a position where the angle of the tangent is maximum to an end of the center,
    Further, the main molding die has a through hole connected to the groove,
    Divisible in a direction parallel to the plane of the central portion,
    Mold for molding 3D cover glass.
  2.  前記主成形用金型は、前記中心部の法線方向から見たとき、前記凹部の外縁が多角形であり、
     前記接線の角度が90°超180°以下まで連続している曲面部は、前記多角形の全周にわたって形成されるとともに、前記多角形における角部の全てに、前記溝部を有する、請求項1に記載の3Dカバーガラス成形用金型。
    The main molding die, when viewed from the normal direction of the central portion, the outer edge of the concave portion is a polygon,
    2. The curved surface portion in which the angle of the tangent is continuous from more than 90 ° to 180 ° or less is formed over the entire circumference of the polygon, and has the groove at all corners of the polygon. 3. The mold for molding a 3D cover glass according to item 1.
  3.  前記多角形は、四角形である、請求項2に記載の3Dカバーガラス成形用金型。 3 The 3D cover glass molding die according to claim 2, wherein the polygon is a quadrangle.
  4.  前記主成形用金型は、前記曲面部のうち前記接線の角度が最大となる端部から、外側に沿って、前記中心部の平面と平行する面に対して3°~30°の傾斜をなす傾斜部を有する、請求項1~3のいずれか1項に記載の3Dカバーガラス成形用金型。 The main molding die has an inclination of 3 ° to 30 ° from the end of the curved surface portion where the angle of the tangent is maximum to a surface parallel to the plane of the central portion along the outside. The mold for molding a 3D cover glass according to any one of claims 1 to 3, which has an inclined portion to be formed.
  5.  前記傾斜部の幅は、平面視において1mm~15mmである、請求項4に記載の3Dカバーガラス成形用金型。 The 3D cover glass molding die according to claim 4, wherein the width of the inclined portion is 1 mm to 15 mm in plan view.
  6.  前記主成形用金型は、複数の部分金型で構成され、
     前記多角形の全周にわたって形成された前記曲面部のうち、前記多角形の辺上に前記部分金型どうしが隣接してできる境界に相当する分割線が存在しない、請求項2~5のいずれか1項に記載の3Dカバーガラス成形用金型。
    The main molding die is composed of a plurality of partial dies,
    6. The method according to claim 2, wherein, of the curved surface portions formed over the entire circumference of the polygon, there is no division line corresponding to a boundary formed between the partial molds adjacent to each other on a side of the polygon. 3. The mold for molding a 3D cover glass according to claim 1.
  7.  前記主形成用金型の前記凹部を有さない側に、底型をさらに有し、
     前記底型は、前記中心部の重心を含む位置に吸引用の穴を有し、前記吸引用の穴は前記貫通孔と接続される、請求項1~6のいずれか1項に記載の3Dカバーガラス成形用金型。
    On the side not having the concave portion of the main forming die, a bottom die is further provided,
    The 3D according to any one of claims 1 to 6, wherein the bottom mold has a suction hole at a position including a center of gravity of the center portion, and the suction hole is connected to the through hole. Mold for cover glass molding.
  8.  前記主形成用金型の前記凹部を有する側に、リング形状のアライメント板をさらに有し、
     前記アライメント板のリング形状の内縁は、平面視において前記凹部の外縁よりも外側にある、請求項1~7のいずれか1項に記載の3Dカバーガラス成形用金型。
    A ring-shaped alignment plate is further provided on the side having the concave portion of the main forming die,
    The 3D cover glass molding die according to any one of claims 1 to 7, wherein a ring-shaped inner edge of the alignment plate is located outside an outer edge of the concave portion in a plan view.
  9.  前記主形成用金型の前記凹部を有する側に、前記主形成用金型を覆う上型をさらに有する、請求項1~8のいずれか1項に記載の3Dカバーガラス成形用金型。 The mold for molding a 3D cover glass according to any one of claims 1 to 8, further comprising an upper mold for covering the mold for main formation, on a side of the mold for main formation having the concave portion.
  10.  請求項1~9のいずれか1項に記載の3Dカバーガラス成形用金型の前記主成形用金型上に平面状のガラス板を載置することと、その後、前記3Dカバーガラス成形用金型を加熱しながら前記貫通孔を経由して真空吸引して前記平面状のガラス板を3D形状に成形した後、冷却することと、を含む3Dカバーガラスの製造方法。 10. A flat glass plate is placed on the main molding die of the 3D cover glass molding die according to any one of claims 1 to 9, and thereafter, the 3D cover glass molding metal. A method for producing a 3D cover glass, comprising: vacuum-suctioning through the through hole while heating a mold to form the planar glass plate into a 3D shape, and then cooling.
  11.  前記冷却後に、前記3Dカバーガラスを前記3Dカバーガラス成形用金型から取り出して、前記3Dカバーガラスの曲面部の外側にある裾部を切断することを含む、請求項10に記載の3Dカバーガラスの製造方法。 The 3D cover glass according to claim 10, comprising removing the 3D cover glass from the 3D cover glass molding die after the cooling, and cutting a skirt portion outside a curved surface portion of the 3D cover glass. Manufacturing method.
  12.  前記切断後、前記3Dカバーガラスの表面を研磨加工することと、その後、前記3Dカバーガラスに化学強化処理をすることとを含む、請求項11に記載の3Dカバーガラスの製造方法。 The method of manufacturing a 3D cover glass according to claim 11, further comprising: after the cutting, polishing the surface of the 3D cover glass, and thereafter performing a chemical strengthening treatment on the 3D cover glass.
PCT/JP2019/032326 2018-08-22 2019-08-19 Molding die for 3d cover glass and method for manufacturing 3d cover glass using same WO2020040100A1 (en)

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