TW202216620A - Method for manufacturing glass plate - Google Patents

Abstract

According to the present invention, a concave line RL formed on a mother glass G comprises a protruding section 7a formed in an end section RLa in the width direction Y of the convex line RL. The protruding section 7a includes: a first base section 8a positioned on a central side in the width direction Y of the convex line RL; and a second base section 8b positioned on the opposite side to the first base section 8a. In this method for manufacturing a glass plate, a scratch is caused in at least one among the first base section 8a and the second base section 8b in an initial crack forming step S2.

Description

玻璃板的製造方法Manufacturing method of glass plate

本發明是有關於一種製造玻璃板的方法。The present invention relates to a method of manufacturing a glass sheet.

於製造液晶顯示器、有機電致發光（electroluminescence，EL）顯示器等面板顯示器用玻璃板的情形時，例如藉由將利用下拉法等成形法所成形的大型母玻璃切斷，而形成特定大小的玻璃板。In the case of manufacturing glass plates for panel displays such as liquid crystal displays and organic electroluminescence (EL) displays, for example, glass of a specific size is formed by cutting a large mother glass formed by a molding method such as a down-draw method. plate.

專利文獻1中揭示有一種玻璃板的製造方法，其包括：凹狀線形成步驟，於母玻璃的表面形成由塑性變形形成的凹狀線；初始裂紋形成步驟，於與凹狀線對應的位置形成內部初始裂紋；裂紋進展步驟，使內部初始裂紋沿著凹狀線於母玻璃的內部進展；以及折斷步驟，沿著凹狀線將母玻璃折斷。Patent Document 1 discloses a method of manufacturing a glass plate, which includes a step of forming concave lines on the surface of mother glass by forming concave lines by plastic deformation, and a step of forming initial cracks at positions corresponding to the concave lines An internal initial crack is formed; a crack progression step allows the internal initial crack to progress inside the mother glass along a concave line; and a breaking step breaks the mother glass along the concave line.

於該製造方法中，藉由凹狀線形成步驟所形成的凹狀線包括藉由塑性變形所形成的壓縮應力層、及形成於較該壓縮應力層更靠母玻璃的內部側的位置的拉伸應力層。In this manufacturing method, the concave line formed by the concave line forming step includes a compressive stress layer formed by plastic deformation, and a tensile stress layer formed at a position closer to the inner side of the mother glass than the compressive stress layer. tensile stress layer.

於初始裂紋形成步驟中，使劃線輪與母玻璃的表面接觸，同時沿著與凹狀線交叉的方向移動。藉此，於母玻璃形成與凹狀線交叉的劃線槽。以該劃線槽為起點，於拉伸應力層形成內部初始裂紋（參照同一文獻的段落0030、段落0031及圖8）。In the initial crack forming step, the scribing wheel is brought into contact with the surface of the mother glass while moving in a direction intersecting the concave line. Thereby, a scribe groove|channel which cross|intersects a concave-shaped line is formed in mother glass. From this scribe groove as a starting point, an internal initial crack is formed in the tensile stress layer (see paragraphs 0030, 0031, and FIG. 8 of the same document).

於裂紋進展步驟中，使以該內部初始裂紋為起點的裂紋於凹狀線的拉伸應力層中進展。其後，藉由執行折斷步驟，可製造端面不產生側向裂紋的玻璃板。 [現有技術文獻] [專利文獻] In the crack development step, the crack starting from the inner initial crack is advanced in the tensile stress layer of the concave line. After that, by performing the breaking step, a glass plate with no lateral cracks on the end surface can be produced. [Prior Art Literature] [Patent Literature]

專利文獻1：日本專利特開2019-89672號公報Patent Document 1: Japanese Patent Laid-Open No. 2019-89672

[發明所欲解決之課題][The problem to be solved by the invention]

如上所述，於現有的玻璃板的製造方法中，為了形成內部初始裂紋，而於母玻璃形成由劃線輪形成的劃線槽。由於劃線槽包含大量側向裂紋，故而於折斷步驟中，需要使母玻璃中形成有劃線槽的部分與玻璃板分離、廢棄。As mentioned above, in the manufacturing method of the conventional glass plate, in order to form an internal initial crack, the scribe groove|channel formed by a scribe wheel is formed in mother glass. Since the scribe groove contains a large number of lateral cracks, in the breaking step, the portion of the mother glass where the scribe groove is formed needs to be separated from the glass plate and discarded.

如此，於現有的玻璃板的製造方法中，需要在母玻璃形成劃線槽的部分，而且需要將該部分廢棄，因此導致玻璃板的良率降低。As described above, in the conventional method for producing a glass plate, it is necessary to form a portion of a scribe groove in the mother glass, and this portion needs to be discarded, resulting in a decrease in the yield of the glass plate.

本發明是鑑於所述情況而完成，其技術性課題在於以切斷面不產生側向裂紋的方式切斷母玻璃，並且提高玻璃板的良率。 [解決課題之手段] The present invention was made in view of the above-mentioned circumstances, and its technical subject is to cut the mother glass so that a lateral crack does not occur in the cut surface, and to improve the yield of the glass plate. [Means of Solving Problems]

本發明是用來解決所述課題，其為一種玻璃板的製造方法，其包括切斷母玻璃的切斷步驟，其特徵在於：所述切斷步驟包括：凹狀線形成步驟，於所述母玻璃的表面形成由塑性變形形成的凹狀線；初始裂紋形成步驟，於所述凹狀線形成初始裂紋；以及裂紋進展步驟，使所述初始裂紋沿著所述凹狀線於所述母玻璃的內部進展，且所述凹狀線包括於所述凹狀線的寬度方向的端部形成的突起部，所述突起部包括：第一基部，位於所述凹狀線的所述寬度方向的中央部側；以及第二基部，位於所述第一基部的相反側，於所述初始裂紋形成步驟中，於所述第一基部及所述第二基部的至少一者形成裂痕。The present invention is intended to solve the above-mentioned problems, and is a manufacturing method of a glass plate, which includes a cutting step for cutting mother glass, wherein the cutting step includes a concave line forming step, wherein the A concave line formed by plastic deformation is formed on the surface of the mother glass; an initial crack forming step, an initial crack is formed on the concave line; and a crack progression step, the initial crack is formed along the concave line in the mother glass. The inside of the glass progresses, and the concave line includes a protruding portion formed at an end portion of the concave line in the width direction, the protruding portion includes a first base portion located in the width direction of the concave line and a second base located on the opposite side of the first base, and in the initial crack forming step, a crack is formed in at least one of the first base and the second base.

根據所述方法，於凹狀線形成步驟中，藉由使母玻璃的表面發生塑性變形，可形成不存在側向裂紋的凹狀線。於初始裂紋形成步驟中，藉由在突起部的第一基部及第二基部的至少一者形成裂痕，可於突起部形成初始裂紋。According to the method, in the step of forming the concave line, by plastically deforming the surface of the mother glass, the concave line without lateral cracks can be formed. In the initial crack forming step, by forming a crack on at least one of the first base portion and the second base portion of the protruding portion, an initial crack can be formed in the protruding portion.

因此，於本發明中，可不如先前那樣藉由劃線輪以與凹狀線交叉的方式形成劃線槽。於裂紋進展步驟中，藉由使以初始裂紋為起點的裂紋沿著凹狀線進展，可製造端面（切斷面）不具有側向裂紋的玻璃板。Therefore, in the present invention, the scribing grooves can be formed so as to intersect with the concave lines by the scribing wheel, as in the past. In the crack progression step, by allowing the crack starting from the initial crack to advance along the concave line, a glass plate having no lateral crack on the end surface (cut surface) can be produced.

如上所述，於本發明中，可於不形成與凹狀線交叉的劃線槽的情況下切斷母玻璃，因此能夠儘可能地減少切斷步驟中的玻璃的廢棄量。藉此，可提高玻璃板的良率。As described above, in the present invention, the mother glass can be cut without forming the scribe grooves intersecting the concave lines, so that the amount of discarded glass in the cutting step can be reduced as much as possible. Thereby, the yield of the glass plate can be improved.

於本方法中，可為所述突起部包括：第一突起部，位於所述凹狀線的所述寬度方向的一端部；以及第二突起部，位於所述凹狀線的所述寬度方向的另一端部，且於所述初始裂紋形成步驟中，於所述第一突起部或所述第二突起部形成所述裂痕。In this method, the protruding portion may include: a first protruding portion located at one end portion of the concave line in the width direction; and a second protruding portion located in the width direction of the concave line and in the initial crack forming step, the crack is formed on the first protruding portion or the second protruding portion.

於所述初始裂紋形成步驟中，可於所述突起部形成沿著所述凹狀線的所述寬度方向的所述裂痕。藉此，可於突起部容易地形成初始裂紋。In the initial crack forming step, the crack along the width direction of the concave line may be formed on the protruding portion. Thereby, the initial crack can be easily formed in the protruding portion.

於所述初始裂紋形成步驟中，可藉由使尖端狀的工具與所述第一基部及所述第二基部的至少一者接觸而形成所述裂痕。藉此，可於突起部確實地形成初始裂紋。In the initial crack forming step, the crack may be formed by contacting a tip-shaped tool with at least one of the first base and the second base. Thereby, the initial crack can be reliably formed in the protrusion.

於所述初始裂紋形成步驟中，可使所述工具振動。藉此，可於突起部確實地形成初始裂紋。 [發明的效果] During the initial crack formation step, the tool may be vibrated. Thereby, the initial crack can be reliably formed in the protrusion. [Effect of invention]

根據本發明，能夠以切斷面不產生側向裂紋的方式切斷母玻璃，並且提高玻璃板的良率。ADVANTAGE OF THE INVENTION According to this invention, the mother glass can be cut|disconnected so that a side crack does not generate|occur|produce in a cut surface, and the yield rate of a glass plate can be improved.

以下，參照圖式對用以實施本發明的形態進行說明。圖1至圖14表示本發明的玻璃板的製造方法的一實施形態。Hereinafter, an embodiment for implementing the present invention will be described with reference to the drawings. 1 to 14 show one embodiment of the method for producing a glass plate of the present invention.

圖1至圖3表示本方法中為了於母玻璃形成凹狀線而使用的劃線筆。於本實施形態中，例示鉛筆型的劃線筆1，但劃線筆的結構並不限定於本實施形態。劃線筆1包括柄2、及固定於該柄2的端部的尖端3。1 to 3 show a scribing pen used for forming concave lines on mother glass in this method. In this embodiment, the pencil-type scribing pen 1 is exemplified, but the structure of the scribing pen is not limited to this embodiment. The scribing pen 1 includes a handle 2 and a tip 3 fixed to the end of the handle 2 .

柄2為金屬製，構成為圓柱狀或多角柱狀。柄2安裝於保持器H。保持器H保持柄2，並且使劃線筆1沿著上下方向及水平方向移動。又，保持器H可自由變更柄2相對於母玻璃G的傾斜角度。The handle 2 is made of metal, and is configured in a columnar shape or a polygonal columnar shape. The handle 2 is attached to the holder H. The holder H holds the handle 2 and moves the scribing pen 1 in the vertical direction and the horizontal direction. In addition, the holder H can freely change the inclination angle of the handle 2 with respect to the mother glass G.

尖端3包括例如單晶或多晶的鑽尖，但不限定於此，可包含聚晶立方氮化硼（Polycrystalline Cubic Boron Nitride，PCBN）、陶瓷、或超硬合金等金屬。尖端3藉由接著劑、硬焊料等固定於柄2的前端部。尖端3構成為截角錐台狀，於其端部形成有與母玻璃G接觸的推壓部4。即，尖端3的軸方向的端面3a中的緣部成為推壓部4。The tip 3 includes, for example, a single crystal or polycrystalline drill tip, but is not limited thereto, and may include metals such as polycrystalline Cubic Boron Nitride (PCBN), ceramics, or cemented carbide. The tip 3 is fixed to the front end of the shank 2 by adhesive, hard solder, or the like. The tip 3 is formed in a truncated pyramid shape, and a pressing portion 4 that is in contact with the mother glass G is formed at its end. That is, the edge part in the end surface 3a of the axial direction of the tip 3 becomes the pressing part 4. As shown in FIG.

推壓部4構成為圓弧狀，以避免母玻璃G產生側向裂紋。推壓部4藉由推壓母玻璃G的表面而使其發生塑性變形，於該塑性變形部形成凹狀線RL。推壓部4的半徑（曲率半徑）較佳為設為0.001 mm～1 mm，更佳為設為0.025 mm～0.5 mm。The pressing portion 4 is formed in an arc shape so as to prevent the mother glass G from generating side cracks. The pressing portion 4 is plastically deformed by pressing the surface of the mother glass G, and a concave line RL is formed in the plastically deformed portion. The radius (curvature radius) of the pressing portion 4 is preferably 0.001 mm to 1 mm, and more preferably 0.025 mm to 0.5 mm.

該圓形的推壓部4可視為包含多個圓弧者。例如，如圖2所示，假想推壓部4由三個圓弧4a～4c構成。於該例中，將各圓弧4a～圓弧4c的中心角θa設定為120°，但不限於此，較理想為設為5°～120°。再者，將各圓弧4a～圓弧4c的中心角θa設定為相等，但亦可由不同的角度構成該等。The circular pressing portion 4 can be regarded as including a plurality of arcs. For example, as shown in FIG. 2, the virtual pressing part 4 is comprised by three circular arcs 4a-4c. In this example, the central angle θa of each of the arcs 4a to 4c is set to 120°, but it is not limited to this, and is preferably 5° to 120°. In addition, although the center angle θa of each of the arcs 4a to 4c is set to be equal, these may be constituted by different angles.

本方法所使用的母玻璃G如圖3所示，包括為正反關係的第一主面Ga及第二主面Gb、以及將第一主面Ga與第二主面Gb相連的端面Gc。於本發明中，將第一主面Ga或第二主面Gb的至少一者稱為母玻璃G的「表面」。於本實施形態中，母玻璃G的厚度t較佳為設為0.01 mm～1 mm，更佳為0.01 mm～0.7 mm。母玻璃G具有一邊的長度為1000 mm以上的大小，但不限定於該尺寸。As shown in FIG. 3 , the mother glass G used in this method includes a first main surface Ga and a second main surface Gb in a front-to-reverse relationship, and an end surface Gc connecting the first main surface Ga and the second main surface Gb. In the present invention, at least one of the first main surface Ga and the second main surface Gb is referred to as the “surface” of the mother glass G. In the present embodiment, the thickness t of the mother glass G is preferably 0.01 mm to 1 mm, more preferably 0.01 mm to 0.7 mm. The mother glass G has a size in which the length of one side is 1000 mm or more, but is not limited to this size.

母玻璃G可藉由公知的浮式法、滾壓法、流孔下引法、再曳引法等各種成形法進行成形，較佳為藉由溢流下拉法進行成形。溢流下拉法為使熔融玻璃流入設置於截面大致為楔形的成形體的上部的溢流槽中，使自該溢流槽向兩側溢出的熔融玻璃沿著成形體的兩側的側壁部流下，並且於成形體的下端部進行融合一體化，而連續成形一塊帶狀玻璃。藉由將帶狀玻璃的一部分沿著寬度方向切斷，而形成矩形狀的母玻璃G。The mother glass G can be formed by various forming methods such as a known float method, rolling method, orifice downdraw method, and redraw method, and is preferably formed by an overflow downdraw method. The overflow down-draw method is to flow molten glass into an overflow groove provided in the upper part of a molded body having a substantially wedge-shaped cross section, and to flow down the molten glass overflowing from the overflow groove to both sides of the molded body along the side walls on both sides of the molded body. , and fused and integrated at the lower end of the formed body to continuously form a strip of glass. Rectangular mother glass G is formed by cutting a part of band-shaped glass in the width direction.

以下，對玻璃板的製造方法進行說明。於該例中，對由包含無鹼玻璃（日本電氣硝子股份有限公司製造的OA-10G）的矩形母玻璃G製造矩形玻璃板的情形進行說明。Hereinafter, the manufacturing method of a glass plate is demonstrated. In this example, the case where a rectangular glass plate is manufactured from the rectangular mother glass G containing alkali-free glass (OA-10G by Nippon Electric Glass Co., Ltd.) will be described.

本方法包括切斷母玻璃G的切斷步驟。如圖4所示，切斷步驟包括：凹狀線形成步驟S1，藉由劃線筆1於母玻璃G的表面（例如第一主面Ga）形成由塑性變形形成的凹狀線RL；初始裂紋形成步驟S2，於凹狀線RL形成初始裂紋；裂紋進展步驟S3，使初始裂紋沿著凹狀線RL於母玻璃G的內部進展；及折斷步驟S4，使彎曲應力作用於母玻璃G。The method includes a cutting step of cutting the mother glass G. As shown in FIG. 4 , the cutting step includes: a concave line forming step S1 , a concave line RL formed by plastic deformation is formed on the surface of the mother glass G (for example, the first main surface Ga) by the scribe pen 1 ; In the crack formation step S2, an initial crack is formed on the concave line RL; in the crack development step S3, the initial crack is advanced in the mother glass G along the concave line RL;

於凹狀線形成步驟S1中，首先，將母玻璃G載置於載置台（未圖示），使劃線筆1與該母玻璃G的第一主面Ga接觸。再者，較理想為於載置台載置樹脂片，將母玻璃G載置於該樹脂片。劃線筆1以柄2相對於母玻璃G傾斜的方式由保持器H支持。於使柄2向移動方向X側傾斜的情形時，其傾斜角度θb（參照圖3）較理想為設為30°～85°，但並不限定於該範圍。In the concave line forming step S1 , first, the mother glass G is placed on a mounting table (not shown), and the scribing pen 1 is brought into contact with the first main surface Ga of the mother glass G. Furthermore, it is preferable to mount a resin sheet on a mounting table, and mount mother glass G on this resin sheet. The scribing pen 1 is supported by the holder H in such a manner that the handle 2 is inclined with respect to the mother glass G. FIG. When the handle 2 is inclined to the moving direction X side, the inclination angle θb (see FIG. 3 ) is preferably set to 30° to 85°, but is not limited to this range.

其後，對劃線筆1賦予負載，藉由尖端3的推壓部4推壓母玻璃G的第一主面Ga，並且如圖5所示般使其沿著移動方向X滑動。劃線筆1的移動速度較理想為設為50 mm/s～1500 mm/s。對劃線筆1賦予的負載設為0.1 N～10 N，但不限定於該範圍，可根據母玻璃G的大小、厚度、材質等條件適當設定。再者，推壓部4（圓弧4a的部分）配置於與該移動方向X正交的朝向（以圓弧4a的切線與移動方向X正交的方式）上（參照圖2）。After that, a load is applied to the scribe pen 1, the first main surface Ga of the mother glass G is pressed by the pressing portion 4 of the tip 3, and is slid in the moving direction X as shown in FIG. 5 . The moving speed of the scribing pen 1 is preferably set to 50 mm/s to 1500 mm/s. The load applied to the scribing pen 1 is set to 0.1 N to 10 N, but is not limited to this range, and can be appropriately set according to conditions such as the size, thickness, and material of the mother glass G. In addition, the pressing part 4 (part of the arc 4 a ) is arranged in a direction orthogonal to the moving direction X (so that the tangent of the arc 4 a is orthogonal to the moving direction X) (see FIG. 2 ).

第一主面Ga的一部分藉由推壓部4的推壓發生塑性變形。如圖5所示，藉由推壓部4的移動，於第一主面Ga中的塑性變形部分形成直線狀的凹狀線RL。以下，將與凹狀線RL的長度方向（移動方向X）正交的方向稱為凹狀線RL的寬度方向Y。凹狀線RL的寬度方向Y的寬度尺寸W1（參照圖6）較理想為設為10 μm～50 μm。凹狀線RL的深度較理想為設為0.3 μm～1.0 μm。A part of the first main surface Ga is plastically deformed by the pressing of the pressing portion 4 . As shown in FIG. 5, by the movement of the pressing part 4, the linear concave-shaped line RL is formed in the plastic deformation part in the 1st main surface Ga. Hereinafter, the direction orthogonal to the longitudinal direction (moving direction X) of the concave line RL is referred to as the width direction Y of the concave line RL. The width dimension W1 (see FIG. 6 ) of the concave line RL in the width direction Y is preferably 10 μm to 50 μm. The depth of the concave line RL is preferably 0.3 μm to 1.0 μm.

如圖6所示，凹狀線RL包括壓縮應力層5、拉伸應力層6、及突起部7a、突起部7b。As shown in FIG. 6 , the concave line RL includes a compressive stress layer 5, a tensile stress layer 6, and protrusions 7a and 7b.

壓縮應力層5藉由母玻璃G的第一主面Ga發生塑性變形而構成。拉伸應力層6形成於較壓縮應力層5更靠母玻璃G的內部側的位置。拉伸應力層6由壓縮應力層5所覆蓋。The compressive stress layer 5 is formed by plastic deformation of the first main surface Ga of the mother glass G. The tensile stress layer 6 is formed at a position closer to the inner side of the mother glass G than the compressive stress layer 5 . The tensile stress layer 6 is covered by the compressive stress layer 5 .

突起部7a、突起部7b形成於凹狀線RL的寬度方向Y上的端部RLa、端部RLb。突起部7a、突起部7b藉由母玻璃G發生塑性變形而自第一主面Ga突出。該突起部7a、突起部7b的突出量（距第一主面Ga的高度）h較理想為設為0.01 μm～0.10 μm。突起部7a、突起部7b形成於凹狀線RL的全長。突起部7a、突起部7b包括壓縮應力層5的一部分5a與拉伸應力層6的一部分6a。The protrusions 7a and 7b are formed at the ends RLa and RLb in the width direction Y of the concave line RL. The protrusions 7a and 7b protrude from the first main surface Ga by plastic deformation of the mother glass G. As shown in FIG. The protrusion amount (height from the first main surface Ga) h of the protrusions 7a and 7b is preferably 0.01 μm to 0.10 μm. The protrusions 7a and 7b are formed over the entire length of the concave line RL. The protrusions 7 a and 7 b include a part 5 a of the compressive stress layer 5 and a part 6 a of the tensile stress layer 6 .

突起部7a、突起部7b包括於凹狀線RL的寬度方向Y的一端部RLa形成的第一突起部7a、及於凹狀線RL的寬度方向Y的另一端部RLb形成的第二突起部7b。各突起部7a、突起部7b包括位於凹狀線RL的寬度方向Y的中央部（底部）側的第一基部8a、及位於寬度方向Y上第一基部8a的相反側的第二基部8b。凹狀線RL的寬度方向Y上的各突起部7a、突起部7b的寬度尺寸W2（第一基部8a至第二基部8b的距離）較佳為設為2 μm～10 μm。The protrusions 7a and 7b include a first protrusion 7a formed at one end RLa in the width direction Y of the concave line RL, and a second protrusion 7a formed at the other end RLb in the width direction Y of the concave line RL 7b. Each of the protrusions 7a and 7b includes a first base 8a located on the center (bottom) side in the width direction Y of the concave line RL, and a second base 8b located on the opposite side of the first base 8a in the width direction Y. The width dimension W2 (distance between the first base portion 8a and the second base portion 8b ) of each of the protrusions 7a and 7b in the width direction Y of the concave line RL is preferably 2 μm to 10 μm.

如圖7所示，第一基部8a及第二基部8b為緩和壓縮應力的緩和層。推測少量壓縮應力或拉伸應力作用於該緩和層，或者壓縮應力及拉伸應力大致被抵消。作為該緩和層的第一基部8a及第二基部8b的寬度尺寸W3、即可形成裂痕的第一基部8a及第二基部8b的寬度尺寸例如為1 μm以下。As shown in FIG. 7, the 1st base part 8a and the 2nd base part 8b are relaxation layers which relieve|moderate a compressive stress. It is presumed that a small amount of compressive stress or tensile stress acts on the relaxation layer, or that the compressive stress and the tensile stress are substantially canceled. The width dimension W3 of the first base portion 8a and the second base portion 8b as the relaxation layer, that is, the width dimension of the first base portion 8a and the second base portion 8b where cracks can be formed, is, for example, 1 μm or less.

如圖8所示，於初始裂紋形成步驟S2中，以於突起部7a、突起部7b的位置處的拉伸應力層6a形成初始裂紋的方式，藉由尖端狀的工具9於突起部7a、突起部7b形成裂痕。作為尖端狀的工具9，例如可使用鑽尖或超硬工具。更具體而言，可使用電鍍系的金剛石銼刀或超硬製的劃線工具。As shown in FIG. 8 , in the initial crack forming step S2, the protrusions 7a, 7b are formed with a tip-shaped tool 9 so as to form initial cracks in the tensile stress layer 6a at the positions of the protrusions 7a and 7b. The protrusions 7b form cracks. As the tip-shaped tool 9, for example, a drill point or a superhard tool can be used. More specifically, an electroplating type diamond file or a superhard scribing tool can be used.

於本實施形態中，示出僅於第一突起部7a形成裂痕的例子，但不限於此，亦可僅於第二突起部7b、或於第一突起部7a及第二突起部7b的兩者形成裂痕。In this embodiment, an example in which cracks are formed only in the first protrusion 7a is shown, but the present invention is not limited to this. form cracks.

具體而言，於初始裂紋形成步驟S2中，使工具9的前端部接觸第一突起部7a的第一基部8a後，使其沿著凹狀線RL的寬度方向Y朝向第二基部8b移動。於該情形時，可使工具9繞其軸心旋轉，亦可使工具9振動。就確實地形成初始裂紋的觀點而言，較佳為使工具9振動。於該情形時，使例如以振幅10 μm～15 μm、振動頻率100 Hz～300 Hz振動的工具9與第一基部8a及第二基部8b分別接觸數次～數百次即可。Specifically, in the initial crack formation step S2, the tip of the tool 9 is brought into contact with the first base 8a of the first protrusion 7a, and then moved toward the second base 8b along the width direction Y of the concave line RL. In this case, the tool 9 can be rotated around its axis, and the tool 9 can also be vibrated. From the viewpoint of surely forming the initial crack, it is preferable to vibrate the tool 9 . In this case, for example, the tool 9 vibrating at an amplitude of 10 μm to 15 μm and a vibration frequency of 100 Hz to 300 Hz may be brought into contact with the first base portion 8a and the second base portion 8b several to several hundred times, respectively.

藉由此種工具9的移動，於第一突起部7a形成裂痕。該裂痕形成於作為第一突起部7a的緩和層的第一基部8a及第二基部8b，未形成於第一基部8a與第二基部8b之間的壓縮應力層5a。以下，將於作為第一突起部7a的緩和層的第一基部8a及第二基部8b形成的裂痕稱為初始裂紋FC。By such movement of the tool 9, a crack is formed in the first protrusion 7a. This crack is formed in the 1st base part 8a and the 2nd base part 8b which are the relaxation layers of the 1st protrusion part 7a, and is not formed in the compressive stress layer 5a between the 1st base part 8a and the 2nd base part 8b. Hereinafter, the cracks formed in the first base portion 8a and the second base portion 8b serving as the alleviation layer of the first protrusion portion 7a are referred to as initial cracks FC.

於裂紋進展步驟S3中，以初始裂紋FC為起點，裂紋於拉伸應力層6內進展。第二基部8b的初始裂紋FC如圖9及圖10中箭頭A1所示，藉由殘留於拉伸應力層6中的應力的作用，沿著凹狀線RL的寬度方向Y進展，橫跨第一突起部7a，而到達第一基部8a。到達第一基部8a的裂紋或第一基部8a的初始裂紋FC如圖9及圖10中箭頭A2所示，藉由殘留於拉伸應力層6中的應力的作用，沿著壓縮應力層5a向凹狀線RL的寬度方向Y的中央部（底部）進展。In the crack development step S3 , the crack progresses in the tensile stress layer 6 starting from the initial crack FC. The initial crack FC of the second base portion 8b progresses along the width direction Y of the concave line RL by the action of the stress remaining in the tensile stress layer 6, as indicated by the arrow A1 in Figs. A protrusion 7a reaches the first base 8a. The crack reaching the first base portion 8a or the initial crack FC of the first base portion 8a, as shown by arrow A2 in FIG. 9 and FIG. 10, moves along the compressive stress layer 5a by the action of the stress remaining in the tensile stress layer 6. The center part (bottom) of the width direction Y of the concave line RL progresses.

若裂紋到達與凹狀線RL的底部對應的位置，則如圖9及圖11中箭頭A3所示，沿著凹狀線RL的長度方向進展。於圖10及圖11中，以符號C表示到達與凹狀線RL的底部對應的位置的裂紋（圖12中相同）。When the crack reaches a position corresponding to the bottom of the concave line RL, as shown by arrow A3 in FIGS. 9 and 11 , the crack progresses along the longitudinal direction of the concave line RL. In FIGS. 10 and 11 , the cracks reaching the positions corresponding to the bottoms of the concave lines RL are denoted by the symbol C (the same in FIG. 12 ).

於裂紋進展步驟S3中，為了提高裂紋C的進展速度，可對母玻璃G賦予外力F1（參照圖11）。藉由該外力F1，以跨過凹狀線RL的方式於母玻璃G產生彎曲應力，裂紋C以更高速度於母玻璃G的內部進展。調整外力F1以避免裂紋C沿著母玻璃G的厚度方向進展。In the crack progression step S3 , in order to increase the progression speed of the crack C, an external force F1 may be applied to the mother glass G (see FIG. 11 ). By the external force F1, a bending stress is generated in the mother glass G so as to cross the concave line RL, and the crack C progresses inside the mother glass G at a higher speed. The external force F1 is adjusted so that the crack C does not progress along the thickness direction of the mother glass G.

裂紋C沿著凹狀線RL進展結束後，執行折斷步驟S4。如圖12所示，於折斷步驟S4中，為了使裂紋C沿著母玻璃G的厚度方向進展，而對母玻璃G賦予外力F2。After the crack C has progressed along the concave line RL, the breaking step S4 is performed. As shown in FIG. 12 , in the breaking step S4 , in order to advance the cracks C in the thickness direction of the mother glass G, an external force F2 is applied to the mother glass G. As shown in FIG.

將該外力F2設定為大於裂紋進展步驟S3中對母玻璃G賦予的外力F1。藉由外力F2，以跨過凹狀線RL的方式於母玻璃G產生彎曲應力。The external force F2 is set to be larger than the external force F1 given to the mother glass G in the crack progression step S3. By the external force F2, a bending stress is generated in the mother glass G so as to straddle the concave line RL.

裂紋C藉由該彎曲應力的作用，沿著母玻璃G的厚度方向進展。裂紋C到達第一主面Ga及第二主面Gb後，將母玻璃G分斷。藉此，形成玻璃板G1。The crack C progresses along the thickness direction of the mother glass G by the action of this bending stress. After the crack C reaches the first main surface Ga and the second main surface Gb, the mother glass G is divided. Thereby, the glass plate G1 is formed.

如圖13所示，玻璃板G1包括第一主面G1a、位於第一主面G1a的相反側的第二主面G1b、及將第一主面G1a與第二主面G1b相連的端面G1c。進而，玻璃板G1於第一主面G1a與端面G1c的邊界部B包括作為凹狀線RL的痕跡的彎曲面CS及突起部7（第一突起部7a或第二突起部7b）。由於彎曲面CS與突起部7不存在側向裂紋，故而玻璃板G1即便不實施研削加工，機械強度亦高。此外，於玻璃板G1殘存沿著彎曲面CS形成的壓縮應力層5、及位於較該壓縮應力層5更靠內部側的位置的拉伸應力層6。As shown in FIG. 13 , the glass plate G1 includes a first main surface G1a, a second main surface G1b located on the opposite side of the first main surface G1a, and an end surface G1c connecting the first main surface G1a and the second main surface G1b. Furthermore, the glass plate G1 includes the curved surface CS and the protrusion 7 (the first protrusion 7a or the second protrusion 7b) which are traces of the concave line RL at the boundary portion B of the first main surface G1a and the end surface G1c. Since there are no lateral cracks on the curved surface CS and the protruding portion 7, the glass plate G1 has high mechanical strength even if the grinding process is not performed. In addition, the compressive stress layer 5 formed along the curved surface CS and the tensile stress layer 6 located on the inner side of the compressive stress layer 5 remain in the glass plate G1 .

以下，參照圖14及圖15，對藉由本實施形態的玻璃板G1的製造方法提高良率的效果進行說明。圖14表示藉由本實施形態的玻璃板的製造方法所切斷的矩形狀的母玻璃。圖15表示如先前般藉由利用劃線輪形成劃線槽所切斷的矩形狀的母玻璃。14 and FIG. 15, the effect which improves the yield by the manufacturing method of the glass plate G1 of this embodiment is demonstrated. FIG. 14 shows the rectangular mother glass cut by the manufacturing method of the glass plate of this embodiment. FIG. 15 shows a rectangular mother glass cut by forming a scribe groove with a scribing wheel as before.

於圖14及圖15所示的例子中，藉由凹狀線形成步驟S1，於較母玻璃G的四邊的端面Gc更靠內側的位置處，於第一主面Ga形成四條凹狀線RL1～RL4。以下，將凹狀線RL1～凹狀線RL4分別稱為第一凹狀線RL1、第二凹狀線RL2、第三凹狀線RL3及第四凹狀線RL4。第一凹狀線RL1與第二凹狀線RL2平行，與第三凹狀線RL3及第四凹狀線RL4正交。In the example shown in FIGS. 14 and 15 , four concave lines RL1 are formed on the first main surface Ga at a position further inward than the end surfaces Gc of the four sides of the mother glass G by the concave line forming step S1. ~RL4. Hereinafter, the concave line RL1 to the concave line RL4 will be referred to as a first concave line RL1, a second concave line RL2, a third concave line RL3, and a fourth concave line RL4, respectively. The first concave line RL1 is parallel to the second concave line RL2, and is orthogonal to the third concave line RL3 and the fourth concave line RL4.

於圖15中，例示於第一凹狀線RL1及第二凹狀線RL2形成初始裂紋的情形。於該情形時，劃線輪10於較第三凹狀線RL3更靠外側（端面Gc側）的位置與第一主面Ga接觸，以與第一凹狀線RL1及第二凹狀線RL2正交的方式移動。以劃線輪10到達凹狀線RL的拉伸應力層的方式設定劃線輪10的切入量。In FIG. 15 , the case where the initial crack is formed is illustrated in the first concave line RL1 and the second concave line RL2 . In this case, the scribing wheel 10 is in contact with the first main surface Ga at a position further outside (end face Gc side) than the third concave line RL3 so as to be in contact with the first concave line RL1 and the second concave line RL2 Move in an orthogonal way. The cutting amount of the scribing wheel 10 is set so that the scribing wheel 10 reaches the tensile stress layer of the concave line RL.

藉由劃線輪10的移動，於母玻璃G形成與第三凹狀線RL3平行的劃線槽SL。該劃線槽SL包含大量側向裂紋。因此，為了避免以該側向裂紋為起點的裂紋進展至第三凹狀線RL3，劃線槽SL需要形成於充分遠離第三凹狀線RL3的位置。因此，為了形成劃線槽SL，母玻璃G的各邊的尺寸L11、L21必然增大。By the movement of the scribing wheel 10, a scribing groove SL parallel to the third concave line RL3 is formed in the mother glass G. As shown in FIG. The scribe groove SL contains a large number of lateral cracks. Therefore, in order to prevent the crack originating from the lateral crack from proceeding to the third concave line RL3, the scribe groove SL needs to be formed at a position sufficiently distant from the third concave line RL3. Therefore, in order to form the scribe grooves SL, the dimensions L11 and L21 of each side of the mother glass G must be increased.

與此相對，於本實施形態中的初始裂紋形成步驟S2中，藉由尖端狀的工具9形成的初始裂紋雖然包含側向裂紋，但主要形成於作為緩和層的第一基部8a及/或第二基部8b。因此、於初始裂紋形成步驟S2中，可於成為玻璃板G1的角部的各凹狀線RL1～凹狀線RL4的交點P（參照圖14）的附近位置形成初始裂紋。On the other hand, in the initial crack forming step S2 in the present embodiment, the initial crack formed by the tip-shaped tool 9 includes lateral cracks, but is mainly formed in the first base portion 8a and/or the first base portion 8a as the relaxation layer and/or the first crack Two bases 8b. Therefore, in the initial crack forming step S2 , the initial crack can be formed in the vicinity of the intersection point P (see FIG. 14 ) of each concave line RL1 to the concave line RL4 serving as the corner of the glass plate G1 .

因此，於本實施形態的玻璃板G1的製造方法中，與現有的製造方法相比，於製造尺寸相同的玻璃板G1的情形時，可減小母玻璃G的各邊的尺寸L1、尺寸L2。即，於本發明中，與現有的製造方法相比，可減少切斷步驟中被廢棄的玻璃的量。藉此，可提高玻璃板G1的良率。Therefore, in the manufacturing method of the glass plate G1 of this embodiment, when manufacturing the glass plate G1 of the same size, the dimension L1 and the dimension L2 of each side of the mother glass G can be made smaller than the conventional manufacturing method. . That is, in this invention, compared with the conventional manufacturing method, the quantity of the glass discarded in a cutting process can be reduced. Thereby, the yield of the glass plate G1 can be improved.

再者，本發明並不限定於所述實施形態的結構，亦不限定於所述作用效果。本發明可於不脫離本發明的主旨的範圍內進行各種變更。In addition, this invention is not limited to the structure of the said embodiment, nor is it limited to the said effect. In the present invention, various modifications can be made without departing from the gist of the present invention.

於所述實施形態中，於凹狀線形成步驟S1中，示出於母玻璃G形成直線狀的凹狀線RL的例子，但本發明並不限定於該形態。於凹狀線形成步驟S1中，亦可於母玻璃G形成包含曲線的凹狀線或圓形的凹狀線。In the said embodiment, in the concave line forming step S1, the example in which the linear concave line RL was formed in the mother glass G was shown, but this invention is not limited to this form. In the concave line forming step S1 , a concave line including a curve or a circular concave line may be formed on the mother glass G.

於所述實施形態中，於初始裂紋形成步驟S2中，藉由使尖端狀的工具9自第一突起部7a的第一基部8a移動至第二基部8b，而形成初始裂紋FC，但本發明並不限定於該形態。如圖16所示，於初始裂紋形成步驟S2中，亦可使工具9與第一突起部7a與第二突起部7b的兩處接觸，而形成多條初始裂紋FC。又，亦可藉由使工具9自突起部7的第二基部8b向第一基部8a移動而形成初始裂紋FC。In the above-described embodiment, in the initial crack forming step S2, the initial crack FC is formed by moving the tip-shaped tool 9 from the first base 8a of the first protrusion 7a to the second base 8b, but the present invention It is not limited to this form. As shown in FIG. 16 , in the initial crack forming step S2, the tool 9 may be brought into contact with two places of the first protruding portion 7a and the second protruding portion 7b to form a plurality of initial cracks FC. Also, the initial crack FC may be formed by moving the tool 9 from the second base portion 8b of the protruding portion 7 to the first base portion 8a.

又，於初始裂紋形成步驟S2中，可僅於第一基部8a形成初始裂紋FC，亦可僅於第二基部8b形成初始裂紋FC。即，於初始裂紋形成步驟S2中，於第一基部8a及第二基部8b的至少一者形成裂痕即可。就提高製造效率的觀點而言，較佳為於第一基部8a及第二基部8b的至少一者形成裂痕。再者，於僅於第一基部8a形成初始裂紋FC時，可於第一基部8a的周邊（例如與第一基部8a相距50 μm的範圍，較佳為與第一基部8a相距30 μm的範圍，更佳為與第一基部8a相距20 μm的範圍）的第一主面Ga形成裂痕。就防止於該第一主面Ga形成裂痕的觀點而言，較佳為僅於第一基部8a形成初始裂紋FC。In addition, in the initial crack forming step S2, the initial crack FC may be formed only in the first base portion 8a, or the initial crack FC may be formed only in the second base portion 8b. That is, in the initial crack formation step S2, a crack may be formed in at least one of the first base portion 8a and the second base portion 8b. From a viewpoint of improving manufacturing efficiency, it is preferable to form a crack in at least one of the 1st base part 8a and the 2nd base part 8b. Furthermore, when the initial crack FC is formed only in the first base portion 8a, it can be formed at the periphery of the first base portion 8a (for example, within a range of 50 μm from the first base portion 8a, preferably within a range of 30 μm from the first base portion 8a ). , more preferably, a crack is formed on the first main surface Ga of the first base portion 8a in a range of 20 μm). From the viewpoint of preventing the formation of cracks in the first main surface Ga, it is preferable that the initial cracks FC are formed only in the first base portion 8a.

於所述實施形態中，示出切斷單層母玻璃G的例子，但不限定於此，本方法亦可應用於切斷將多塊母玻璃積層而成的玻璃積層體、或將母玻璃與樹脂板積層而成的玻璃樹脂積層體的情形。In the above-described embodiment, an example of cutting a single-layer mother glass G is shown, but the present method is not limited to this, and the present method can also be applied to cutting a glass laminate formed by laminating a plurality of mother glasses, or cutting a mother glass. In the case of a glass resin laminate formed by laminating with a resin plate.

於所述實施形態的初始裂紋形成步驟S2中，使工具9的前端部接觸第一突起部7a的第一基部8a後，使其沿著凹狀線RL的寬度方向Y向第二基部8b移動，此時使工具9振動，但亦可不使工具9移動及振動。例如，可於將工具9的前端部配置於第一突起部7a的第一基部8a或第二基部8b的上方的狀態下，使該工具9掉落而使工具9的前端部接觸第一突起部7a的第一基部8a或第二基部8b，藉此形成初始裂紋FC。於該情形時，工具9的前端部接觸第一突起部7a等時的動能較佳為例如0.013 J以上。In the initial crack formation step S2 of the above-described embodiment, after the tip of the tool 9 is brought into contact with the first base 8a of the first protrusion 7a, it is moved to the second base 8b along the width direction Y of the concave line RL. , at this time, the tool 9 is vibrated, but the tool 9 may not be moved and vibrated. For example, in a state where the tip of the tool 9 is placed above the first base 8a or the second base 8b of the first protrusion 7a, the tool 9 may be dropped so that the tip of the tool 9 contacts the first protrusion The first base 8a or the second base 8b of the portion 7a, whereby an initial crack FC is formed. In this case, the kinetic energy when the front end portion of the tool 9 contacts the first protruding portion 7a or the like is preferably, for example, 0.013 J or more.

1:劃線筆 2:柄 3:尖端 3a:尖端的軸方向的端面 4:推壓部 4a、4b、4c:圓弧 5:壓縮應力層 5a:壓縮應力層的一部分 6:拉伸應力層 6a:拉伸應力層的一部分 7:突起部 7a:第一突起部（突起部） 7b:第二突起部（突起部） 8a:第一基部 8b:第二基部 9:尖端狀的工具 10:劃線輪 B:邊界部 C:裂紋 CS:彎曲面 F1、F2:外力 FC:初始裂紋 G:母玻璃 G1:玻璃板 G1a、Ga:第一主面 G1b、Gb:第二主面 G1c、Gc:端面 H:保持器 RL:凹狀線 RL1:第一凹狀線 RL2:第二凹狀線 RL3:第三凹狀線 RL4:第四凹狀線 RLa、RLb:凹狀線的寬度方向的端部 S1:凹狀線形成步驟 S2:初始裂紋形成步驟 S3:裂紋進展步驟 S4:折斷步驟 SL:劃線槽 X:移動方向 Y:凹狀線的寬度方向 1: scribing pen 2: handle 3: tip 3a: End face in the axial direction of the tip 4: Pushing part 4a, 4b, 4c: Arc 5: Compressive stress layer 5a: Part of the compressive stress layer 6: Tensile stress layer 6a: Part of the tensile stress layer 7: Protrusions 7a: First protrusion (protrusion) 7b: Second protrusion (protrusion) 8a: first base 8b: Second base 9: Tip-like tools 10: Scribing wheel B: Boundary C: Crack CS: Curved Surface F1, F2: external force FC: Initial crack G: mother glass G1: glass plate G1a, Ga: the first principal surface G1b, Gb: the second main surface G1c, Gc: end face H: retainer RL: concave line RL1: first concave line RL2: Second concave line RL3: Third concave line RL4: Fourth concave line RLa, RLb: Ends in the width direction of the concave line S1: Concave line forming step S2: Initial crack formation step S3: Crack Progression Step S4: Breaking Step SL: Scribing slot X: moving direction Y: The width direction of the concave line

圖1是劃線筆的立體圖。 圖2是劃線筆的平面圖。 圖3是劃線筆的側視圖。 圖4是表示玻璃板的製造方法的流程圖。 圖5是表示玻璃板的製造方法中的凹狀線形成步驟的平面圖。 圖6是圖5的VI-VI線截面圖。 圖7是母玻璃板的要部放大截面圖。 圖8是表示玻璃板的製造方法中的初始裂紋形成步驟的截面圖。 圖9是表示玻璃板的製造方法中的裂紋進展步驟的平面圖。 圖10是表示玻璃板的製造方法中的裂紋進展步驟的截面圖。 圖11是表示玻璃板的製造方法中的裂紋進展步驟的立體圖。 圖12是表示玻璃板的製造方法中的折斷步驟的截面圖。 圖13是所製造的玻璃板的立體圖。 圖14是藉由切斷步驟所切斷的母玻璃的平面圖。 圖15是藉由現有的方法所切斷的母玻璃的平面圖。 圖16是表示玻璃板的製造方法中的初始裂紋形成步驟的其他例的截面圖。 FIG. 1 is a perspective view of a scribing pen. Fig. 2 is a plan view of the scribing pen. Figure 3 is a side view of the scribing pen. FIG. 4 is a flowchart showing a method of manufacturing a glass plate. 5 is a plan view showing a concave line forming step in the method of manufacturing a glass plate. FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 5 . 7 is an enlarged cross-sectional view of a main part of a mother glass plate. 8 is a cross-sectional view showing an initial crack formation step in the method of manufacturing a glass plate. FIG. 9 is a plan view showing a crack progression step in the manufacturing method of the glass plate. 10 is a cross-sectional view showing a crack progression step in the method of manufacturing a glass plate. FIG. 11 is a perspective view showing a crack progression step in the manufacturing method of the glass plate. 12 is a cross-sectional view showing a breaking step in the method of manufacturing a glass sheet. FIG. 13 is a perspective view of the manufactured glass plate. FIG. 14 is a plan view of the mother glass cut by the cutting step. FIG. 15 is a plan view of mother glass cut by a conventional method. 16 is a cross-sectional view showing another example of the initial crack formation step in the manufacturing method of the glass plate.

5:壓縮應力層 5: Compressive stress layer

5a:壓縮應力層的一部分 5a: Part of the compressive stress layer

6:拉伸應力層 6: Tensile stress layer

6a:拉伸應力層的一部分 6a: Part of the tensile stress layer

7a:第一突起部(突起部) 7a: First protrusion (protrusion)

7b:第二突起部(突起部) 7b: Second protrusion (protrusion)

8a:第一基部 8a: first base

8b:第二基部 8b: Second base

9:尖端狀的工具 9: Tip-like tools

G:母玻璃 G: mother glass

Ga:第一主面 Ga: The first principal surface

RL:凹狀線 RL: concave line

RLa、RLb:凹狀線的寬度方向的端部 RLa, RLb: the ends of the concave line in the width direction

Y:凹狀線的寬度方向 Y: The width direction of the concave line

Claims (5)

一種玻璃板的製造方法，包括切斷母玻璃的切斷步驟，其特徵在於： 所述切斷步驟包括：凹狀線形成步驟，於所述母玻璃的表面形成由塑性變形形成的凹狀線；初始裂紋形成步驟，於所述凹狀線形成初始裂紋；以及裂紋進展步驟，使所述初始裂紋沿著所述凹狀線於所述母玻璃的內部進展，且 所述凹狀線包括於所述凹狀線的寬度方向的端部形成的突起部， 所述突起部包括：第一基部，位於所述凹狀線的所述寬度方向的中央部側；以及第二基部，位於所述第一基部的相反側， 於所述初始裂紋形成步驟中，於所述第一基部及所述第二基部的至少一者形成裂痕。 A method for manufacturing a glass plate, comprising a cutting step for cutting mother glass, characterized in that: The cutting step includes: a concave line forming step of forming a concave line formed by plastic deformation on the surface of the mother glass; an initial crack forming step of forming an initial crack on the concave line; and a crack progression step, allowing the initial crack to progress along the concave line inside the mother glass, and The concave line includes a protrusion formed at an end portion of the concave line in the width direction, The protruding portion includes: a first base portion located on the center portion side of the concave line in the width direction; and a second base portion located on the opposite side of the first base portion, In the initial crack forming step, a crack is formed in at least one of the first base and the second base. 如請求項1所述的玻璃板的製造方法，其中所述突起部包括：第一突起部，位於所述凹狀線的所述寬度方向的一端部；以及第二突起部，位於所述凹狀線的所述寬度方向的另一端部，且 於所述初始裂紋形成步驟中，於所述第一突起部或所述第二突起部形成所述裂痕。 The method for manufacturing a glass plate according to claim 1, wherein the protruding portion includes: a first protruding portion located at one end portion of the concave line in the width direction; and a second protruding portion located in the concave line the other end of the line in the width direction, and In the initial crack forming step, the crack is formed on the first protruding portion or the second protruding portion. 如請求項1或請求項2所述的玻璃板的製造方法，其中於所述初始裂紋形成步驟中，於所述突起部形成沿著所述凹狀線的所述寬度方向的所述裂痕。The manufacturing method of the glass plate according to claim 1 or claim 2, wherein in the initial crack forming step, the crack along the width direction of the concave line is formed in the protrusion. 如請求項1至請求項3中任一項所述的玻璃板的製造方法，其中於所述初始裂紋形成步驟中，藉由使尖端狀的工具與所述第一基部及所述第二基部的至少一者接觸而形成所述裂痕。The method for manufacturing a glass plate according to any one of Claims 1 to 3, wherein in the initial crack forming step, the first base and the second base are formed by connecting a tip-shaped tool to the first base and the second base. At least one of them contacts to form the crack. 如請求項4所述的玻璃板的製造方法，其中於所述初始裂紋形成步驟中，使所述工具振動。The method for manufacturing a glass plate according to claim 4, wherein in the initial crack forming step, the tool is vibrated.

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