CN109093451B

CN109093451B - System and method for improving strength of glass substrate, glass cover plate and electronic equipment

Info

Publication number: CN109093451B
Application number: CN201810960957.9A
Authority: CN
Inventors: 王小伟
Original assignee: Oppo Chongqing Intelligent Technology Co Ltd
Current assignee: Oppo Chongqing Intelligent Technology Co Ltd
Priority date: 2018-08-22
Filing date: 2018-08-22
Publication date: 2020-05-22
Anticipated expiration: 2038-08-22
Also published as: CN109093451A

Abstract

The invention discloses a system and a method for improving the strength of a glass substrate, a glass cover plate and electronic equipment. The method comprises the following steps: providing a glass substrate and carrying out strengthening treatment on the glass substrate, wherein the glass substrate is provided with an upper surface, a lower surface and a side wall surrounding the upper surface and the lower surface which are oppositely arranged; and polishing the side wall subjected to the strengthening treatment. Therefore, micro-damage at the side wall of the glass substrate can be improved, the side strength is improved, and the whole service life of the glass substrate is prolonged.

Description

System and method for improving strength of glass substrate, glass cover plate and electronic equipment

Technical Field

The invention relates to the field of electronic equipment, in particular to a system and a method for improving the strength of a glass substrate, a glass cover plate and electronic equipment.

Background

With the rapid development of electronic technology, semiconductor and material fields, the competition of electronic devices is becoming more and more intense. Besides the use performance of the electronic device, the appearance also becomes an important factor for improving the competitiveness of the electronic device. The glass cover plate has the advantages of high transmittance, realization of various appearances by printing films and the like, no signal shielding and the like, and is widely applied to protective cover plates and backshells of various electronic devices.

However, the strength and the strengthening method of the glass cover plate still need to be improved.

Disclosure of Invention

The present invention is directed to solving at least one of the following technical problems:

although the glass cover plate can improve the mechanical properties of the glass cover plate by strengthening the glass substrate. However, the glass cover plate is still easily damaged, broken and cracked at the corners and side positions in the actual use process. This is mainly because the conventional strengthening method is mainly intended to enhance the strength of the upper and lower surfaces of the glass cover plate and to perform a process such as polishing after strengthening. Therefore, the strength substrate of the main body surface of the conventional glass cover plate can meet the use requirements of users. However, the glass on the side wall is slightly damaged during the strengthening treatment, so that the strengthened side wall has "defects" caused by slight damage, and is easily damaged or broken by external force. Therefore, the service life of the whole glass cover plate is not ideal.

In view of the above, in one aspect of the present invention, a method for improving strength of a glass substrate is provided. The method comprises the following steps: providing a glass substrate and carrying out strengthening treatment on the glass substrate, wherein the glass substrate is provided with an upper surface, a lower surface and a side wall surrounding the upper surface and the lower surface which are oppositely arranged; and polishing the side wall subjected to the strengthening treatment. Therefore, micro-damage at the side wall of the glass substrate can be improved, the side strength is improved, and the whole service life of the glass substrate is prolonged.

In yet another aspect of the present invention, a system for increasing the strength of a glass substrate is presented. The system comprises: the polishing device comprises a fixing unit and a polishing fabric, wherein the fixing unit can fix a plurality of glass substrates and enables the side walls of the glass substrates to contact the polishing fabric. Therefore, the system can polish the side wall of the glass substrate, remove the strengthened micro-damage, improve the side strength and further be beneficial to prolonging the whole service life of the glass substrate.

In yet another aspect of the present invention, a glass cover plate is provided. The glass cover plate is treated by the method or the system as described above. Therefore, the glass cover plate has the advantages of strong side edge strength and long whole service life.

In yet another aspect of the present invention, an electronic device is presented. The electronic device comprises the glass cover plate. Therefore, the electronic equipment has the advantages of strong strength of the glass cover plate and long service life of the whole cover plate.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic flow chart illustrating a method for increasing the strength of a glass substrate according to one embodiment of the present invention;

FIG. 2 shows a schematic structural view of a glass substrate according to an embodiment of the present invention;

FIG. 3 shows a schematic structural view of a glass substrate according to another embodiment of the present invention;

FIG. 4 is a schematic partial flow chart illustrating a method for increasing the strength of a glass substrate according to one embodiment of the present invention;

FIG. 5 shows a schematic view of a limiting platen and polishing cloth according to one embodiment of the invention;

FIG. 6 shows a schematic structural diagram of a system for increasing the strength of a glass substrate according to one embodiment of the present invention;

fig. 7 shows a schematic structural diagram of a system for increasing the strength of a glass substrate according to yet another embodiment of the present invention.

Description of reference numerals:

100: a glass substrate; 110: an upper surface; 120: a lower surface; 130: a side wall;

200: a fixing device; 300: polishing the fabric; 310: a rotating shaft;

1000: a strengthening device; 2000: provided is a polishing device.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In one aspect of the invention, a method of increasing the strength of a glass substrate is provided. According to the method, after the strengthening treatment, the polishing treatment operation is added to the side edge, so that the strength of the side edge of the glass substrate is improved, the micro damage to the side edge glass caused by the strengthening treatment is improved, the overall strength of the glass substrate is improved, and the service life is prolonged. According to a specific embodiment of the present invention, referring to fig. 1, the method may comprise the steps of:

s100: providing a glass substrate and performing strengthening treatment on the glass substrate

According to an embodiment of the present invention, in this step, a glass substrate is provided, and a strengthening treatment is performed on the glass substrate. According to the embodiment of the present invention, the specific shape and chemical composition of the glass substrate are not particularly limited, and those skilled in the art can select the shape and chemical composition according to actual situations. For example, referring to fig. 2, the glass substrate 100 may have an upper surface 110 and a lower surface 120 disposed opposite to each other, and a sidewall 130 surrounding the upper surface 110 and the lower surface 120, in other words, the glass substrate may have a rectangular parallelepiped or a shape similar to a rectangular parallelepiped. According to an embodiment of the present invention, at least one of the upper surface 110 and the sidewall 130 (including a plurality of sidewalls, 130A and 130B shown in the figure) of the glass substrate may be a curved surface. That is, the glass substrate may be a glass substrate for preparing a curved screen or a curved backplane, and at least a portion of the upper surface or the sidewall may not be a planar structure. According to further embodiments of the present invention, the glass substrate may also be a glass substrate for making an integrated housing, namely: referring to fig. 3, the glass substrate may include a side extending in a direction perpendicular or approximately perpendicular to a plane of the upper surface 110 of the glass substrate 100, and the housing formed by the glass substrate may be a protective cover or a back cover having at least a portion of a side frame.

According to one embodiment of the present invention, the glass substrate may be obtained from a glass base material by: first, a glass substrate is subjected to Cutting and Numerical Control (CNC) cutting to obtain a substrate having a predetermined shape. The predetermined shape may be the shape of the glass substrate described above. For example, the substrate may have sidewalls and the upper surface may be a curved surface. Subsequently, the side walls and the curved surface of the substrate are polished. Subsequently, the upper and lower surfaces are polished. Therefore, the cutting traces left by the previous cutting and cutting treatment can be removed, and the strengthening effect of the strengthening treatment can be improved.

According to the embodiment of the present invention, the specific operation of the strengthening treatment is not particularly limited, and those skilled in the art can select the strengthening treatment according to the requirements of the actual product and the specific chemical composition of the glass substrate.

S200: polishing the strengthened side wall

According to an embodiment of the present invention, in this step, the side wall of the glass substrate subjected to the strengthening treatment is subjected to a polishing treatment. As described above, although the strengthening treatment can improve the mechanical strength of the glass substrate and prolong the service life of the glass substrate, the strengthening treatment inevitably affects the side wall and causes micro damage. These slight damage points can become "defects" in the glass substrate, and the "defects" are prone to crack when subjected to external forces (such as collision, falling, scratching, etc.) in the subsequent actual use process. In this case, even if the upper surface of the glass substrate has a good mechanical strength, the glass substrate may be damaged due to damage to the side edges of the glass substrate.

Therefore, according to the embodiment of the invention, after the strengthening treatment, the polishing treatment is performed on the side wall of the glass substrate, and the damage formed by the strengthening treatment is slight, so that the micro damage can be removed only by polishing the side wall after the strengthening treatment, so that the residual defect of the side wall of the glass substrate is avoided, and the problem that the glass substrate cracks at the side edge in the using process can be relieved or even solved.

According to an embodiment of the present invention, the polishing process may be performed in the presence of a polishing liquid. Specifically, in the polishing process, a polishing liquid is supplied to the side wall, and the side wall is rubbed by the polishing cloth, thereby polishing. The specific type of polishing fabric is not particularly limited, and may be, for example, a brush, a buffing, or the like. The brush can be a pig brush or a nylon brush, and the skilled person can select the brush according to actual conditions. According to the embodiment of the present invention, the polishing slurry may contain a grinding powder, and the specific chemical composition of the grinding powder can be selected by those skilled in the art according to the actual needs. For example, the milled powder may contain cerium oxide. According toIn some embodiments of the invention, the concentration of abrasive powder in the polishing slurry may be in the range of 1 to 1.2g/cm³. When the concentration of crocus was in above-mentioned within range in the polishing solution, through comparatively simple and convenient polishing, can effectively get rid of the microdefect of lateral wall department, can not show the extension polishing time because concentration is not enough promptly, cause the man-hour of reinforceing the glass substrate to show the extension, influence production efficiency, also can not be because crocus concentration is too big, influence the surface smoothness of the lateral wall after the polishing is handled.

According to an embodiment of the present invention, in order to improve production efficiency, in this step, the polishing process may be simultaneously performed on the side walls of a plurality of glass substrates. Specifically, the plurality of glass substrates may be fixed to the fixing bracket or the fixing substrate, so that the sidewalls of the plurality of glass substrates are exposed to the outside, and the sidewalls of the plurality of glass substrates are polished simultaneously.

According to an embodiment of the present invention, the plurality of glass substrates may be fixed to the fixing bracket in parallel and spaced apart from each other. In order to prevent the contact between the surfaces of two adjacent glass substrates from being abraded and scratched, before the polishing treatment, the method may further include: a protective film layer is provided in advance on at least one of the upper surface and the lower surface of the glass substrate. The specific composition of the protective film layer is not particularly limited, and for example, the protective film layer may be formed by attaching a protective film, or by spraying or printing a protective oil on the upper surface or the lower surface. According to an embodiment of the present invention, referring to fig. 4, a plurality of glass substrates 100, the upper surfaces of which all face in the same direction, can be stacked and fixed by a fixing unit 200. Therefore, the protective film layer can be formed on the upper surface of each glass substrate or the lower surface of each glass substrate, and the two adjacent substrates can be prevented from being rubbed and damaged by collision in the polishing process.

According to an embodiment of the present invention, when a plurality of glass substrates are fixed in the manner as illustrated in fig. 4, the polishing process may: the polishing cloth 300 is placed at the exposed side wall of the glass substrate and is circularly reciprocated to effect polishing of the side wall. In particular, the polishing cloth can be a brush having an axis of rotation 310 (310A and 310B as shown). The rotation shaft 310 is provided perpendicular to the upper surface of the glass substrate, and the side wall can be friction-polished by rotating the brush based on the rotation shaft. According to an embodiment of the present invention, in order to improve polishing efficiency, in this step, both opposite sidewalls of the glass substrate 100 may be exposed while both sidewalls are polished using two sets of brushes (300A and 300B as shown in the drawing).

According to other embodiments of the present invention, in order to save the equipment cost, the grinder for polishing the upper and lower surfaces of the glass substrate 100 may be simply modified to perform the above-described polishing process for the sidewalls: a plurality of glass substrates according to the embodiment of the invention can be placed in a grinder with an upper grinding disc and a lower grinding disc, the side walls of the plurality of glass substrates are placed upwards, and polishing fabrics such as brushes, grinding leather and the like are arranged above the side walls. And rotating the upper and lower grinding discs to synchronously polish the side walls of the plurality of glass substrates. Taking a rectangular glass substrate as an example, polishing one side wall at a time, and polishing four side walls in four times. Therefore, the side wall can be strengthened by utilizing the equipment of the existing production line, and the method is favorable for popularization.

According to other embodiments of the present invention, referring to fig. 3, the fixing unit for fixing the plurality of glass substrates 100 may also be a limit press plate. That is, the glass substrate may be placed in a position-restricting platen and subjected to the polishing treatment. Specifically, the glass substrate is placed in a limiting groove in a limiting pressure plate, the upper surface or the lower surface of the glass substrate is arranged in parallel to the plane where the limiting pressure plate is located, and the polishing fabric 300 is arranged on the inner side wall of the limiting groove. The areas of the upper surface and the lower surface of the glass substrate are smaller than the bottom area of the limiting groove. That is, the stopper groove is designed based on the shape of the glass substrate with a certain margin left. Therefore, as long as the glass substrate and the limiting pressure plate generate relative movement, the polishing fabric 300 fixed at the inner side wall of the limiting groove can realize polishing treatment on the side wall: because allowance is reserved between the limiting groove and the glass substrate arranged in the limiting groove and the glass substrate is not completely fixed in the limiting groove, the glass substrate and the limiting pressing plate can move relatively as long as the limiting pressing plate rotates or moves back and forth. At the moment, the polishing fabric arranged on the inner side wall of the limiting groove is in frictional contact with the glass substrate, so that polishing treatment is realized.

For example, according to some embodiments of the present invention, the limiting pressure plate may have a rotation axis and may rotate around the rotation axis (the rotation axis may be perpendicular to the plane of the limiting pressure plate). During the rotation process, the rotation direction can be changed, so that the glass substrate fixed in the limiting groove can generate relative movement with the limiting pressure plate due to inertia when the rotation direction is changed. Alternatively, according to other embodiments of the present invention, the thickness of the limiting pressing plate is smaller than that of the glass substrate, and the upper surface or the lower surface is exposed when the glass substrate is fixed inside the limiting groove. Specifically, the limiting pressure plate can be thinner than the glass substrate by 0.05-0.25 mm, so that the upper surface or the lower surface of the glass substrate exposed outside can be subjected to second polishing by using a second polishing fabric while the side wall is polished. Since the second polishing cloth needs to perform a cyclic reciprocating motion to rub the upper or lower surface exposed to the outside, a relative movement inevitably occurs between the glass substrate and the limiting pressing plate when the second polishing is performed. Thus, the polishing process of the side wall and the second polishing of the upper surface or the lower surface can be easily and simultaneously performed.

In the above embodiment, the polishing cloth fixed on the inner side wall of the limiting groove may be a brush. To further enhance the effect of the polishing process, the tip of the brush may be in contact with the sidewall of the glass substrate. According to some embodiments of the present invention, the length of the brush may be 3 to 20mm, and thus, when the glass substrate and the restraining pressure plate are relatively moved, bristles of the brush are deformed to polish the side wall of the glass substrate. When the bristle length of the brush is within the above range, a proper polishing pressure can be generated in a slight relative movement, so that the polishing effect of the polishing process can be improved.

Alternatively, according to other embodiments of the present invention, the polishing cloth fixed inside the stopper groove may be a buff. A gap of 0.1-0.3mm is reserved between the buffing and the side wall of the glass substrate. Thereby, an appropriate polishing pressure can be generated also in a slight relative movement, so that the polishing effect of the polishing process can be improved.

According to an embodiment of the present invention, after the polishing process is performed on the sidewalls, the method may further include a process of polishing the upper and lower surfaces. According to other embodiments of the present invention, the method may further include a printing process to form a printing ink layer on the glass substrate, so that the appearance effect of the glass substrate may be improved.

The glass substrate treated by the method is tested for mechanical strength, and compared with a sample which is not subjected to polishing treatment on the side wall after strengthening treatment, the glass substrate provided by the embodiment of the invention has the advantage that the steel ball impact resistance can be improved by 50-80%.

In another aspect of the invention, a system for increasing the strength of a glass substrate is presented. The system can improve the strength of the glass substrate by using the method described above. According to the embodiment of the invention, the system can perform polishing treatment on the side wall of the glass substrate subjected to strengthening treatment. Specifically, the system includes a polishing apparatus, and referring to fig. 6, the polishing apparatus includes a fixing unit 200 and a polishing cloth 300, and the fixing unit 200 may fix a plurality of glass substrates and make sidewalls of the glass substrates contact the polishing cloth 300. Thus, micro-damage at the side wall due to the strengthening treatment can be improved, and the overall strength of the glass substrate can be improved.

According to a specific embodiment of the present invention, the fixing unit may include a fixing bracket. The fixing bracket can fix a plurality of glass substrates at intervals, the upper surfaces or the lower surfaces of the glass substrates are arranged in parallel, and at least one side wall is exposed; the polishing fabric can include at least one brush configured to rotate about an axis of rotation perpendicular to the upper surface. The holding unit and the polishing cloth may have a structure therebetween as shown in fig. 4, so that the sidewall can be polished using the holding unit and the polishing cloth in the manner described above.

According to further embodiments of the present invention, the fixing unit may include a position-limiting pressing plate. The limit pressure plate may be the limit pressure plate described above, and may have a structure as shown in fig. 5, for example. Specifically, a limiting groove is formed in the limiting pressing plate, the bottom surface of the limiting groove is matched with the upper surface or the lower surface of the glass substrate, and the polishing fabric is arranged on the inner side wall of the limiting groove.

According to the embodiment of the invention, the system can simultaneously polish the upper surface or the lower surface of the glass substrate while polishing. Specifically, the polishing apparatus may further include a second polishing cloth. The second polishing cloth is used to polish the upper surface or the lower surface of the glass substrate, and may be disposed above the limiting groove, for example, when the fixing unit is the limiting pressing plate described above. The thickness of the limiting pressing plate may be smaller than that of the glass substrate, and thus, the upper surface (or the lower surface) of the glass substrate at the limiting groove is exposed to the outside, so that the simultaneous polishing of the side wall and the upper surface (or the lower surface) can be achieved.

As previously described, the system can mitigate micro-damage on the sidewalls of the strengthened glass substrate. Thus, referring to FIG. 7, the system may further include an augmentation instrument 1000. The strengthening apparatus 1000 is configured to supply the glass substrate, which has been strengthened by the strengthening apparatus, to the polishing apparatus 2000.

Therefore, the system can improve the overall strength of the glass substrate, and relieve the problem that the glass substrate has cracked edges at the side wall, so that the overall strength of the glass substrate can be improved.

In another aspect of the invention, a glass cover plate is provided. The glass cover plate is treated by the method or the system as described above. Therefore, the glass cover plate has the advantages of strong side edge strength and long whole service life.

According to an embodiment of the present invention, the specific type of the electronic device is not particularly limited. For example, the electronic device may be any of various types of computer system devices that are mobile or portable and that perform wireless communications. In particular, the electronic device may be a mobile or smart phone (e.g., an iPhone (TM) based phone), a Portable gaming device (e.g., Nintendo DS (TM), PlayStation Portable (TM), Gameboy Advance (TM), iPhone (TM)), a laptop, a PDA, a Portable internet device, a music player, and a data storage device, other handheld devices, and a headset such as a watch, an in-ear headphone, a pendant, a headset, etc., and other wearable devices (e.g., a Head Mounted Device (HMD) such as an electronic necklace, an electronic garment, an electronic bracelet, an electronic necklace, an electronic tattoo, an electronic device, or a smart watch). The electronic device may also be any of a number of electronic devices including, but not limited to, cellular phones, smart phones, other wireless communication devices, personal digital assistants, audio players, other media players, music recorders, video recorders, cameras, other media recorders, radios, medical devices, vehicle transportation equipment, calculators, programmable remote controllers, pagers, laptop computers, desktop computers, printers, netbook computers, Personal Digital Assistants (PDAs), Portable Multimedia Players (PMPs), moving picture experts group (MPEG-1 or MPEG-2) audio layer 3(MP3) players, portable medical devices, and digital cameras and combinations thereof. In some cases, the electronic device may perform a variety of functions (e.g., playing music, displaying videos, storing pictures, and receiving and sending telephone calls). If desired, the electronic device may be a portable device such as a cellular telephone, media player, other handheld device, wristwatch device, pendant device, earpiece device, or other compact portable device.

In the description of the present invention, the terms "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. For example, the "upper surface" of the present invention may be a surface facing outward after the glass substrate is used in an electronic device, and the "lower surface" may be a surface facing the inside of the electronic device.

In the description herein, references to the description of "one embodiment," "another embodiment," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. In addition, it should be noted that the terms "first" and "second" in this specification are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A method of increasing the strength of a glass substrate, comprising:

providing a glass substrate and carrying out strengthening treatment on the glass substrate, wherein the glass substrate is provided with an upper surface, a lower surface and a side wall surrounding the upper surface and the lower surface which are oppositely arranged;

polishing the side wall subjected to the strengthening treatment;

printing the polished glass substrate so as to form a printing ink layer on the glass substrate;

when the side wall is polished, the glass substrate is placed in a limiting groove in a limiting pressure plate, the upper surface or the lower surface of the glass substrate is arranged in parallel to the plane where the limiting pressure plate is located, the areas of the upper surface and the lower surface of the glass substrate are smaller than the bottom area of the limiting groove, polishing fabrics are arranged on the inner side wall of the limiting groove, the limiting pressure plate is provided with a rotating shaft perpendicular to the plane where the limiting pressure plate is located, the limiting pressure plate can rotate around the rotating shaft, the rotating direction can be changed in the rotating process, and the polishing treatment is realized by enabling the glass substrate and the limiting pressure plate to move relatively.

2. The method of claim 1, wherein providing the glass substrate comprises:

and cutting the glass preform to form the glass substrate, wherein at least one of the upper surface and the side wall of the glass substrate is an arc surface.

3. The method of claim 1, wherein the polishing process comprises:

and supplying polishing liquid to the side wall, and rubbing the side wall by using a polishing fabric in the presence of the polishing liquid.

4. The method of claim 1, wherein the thickness of the limiting platen is less than the thickness of the glass substrate, and wherein the polishing is performed while further comprising: and performing second polishing on the upper surface or the lower surface of the glass substrate exposed outside by using a second polishing fabric.

5. The method according to claim 1, wherein the polishing cloth fixed to the inner side wall of the stopper groove is a brush, the tip of the brush is in contact with the side wall of the glass substrate, and the length of the brush is 3 to 20 mm;

or the polishing fabric fixed in the limiting groove is a grinding leather, and a gap of 0.1-0.3mm is reserved between the grinding leather and the side wall of the glass substrate.

6. The method of claim 3 wherein said polishing slurry comprises abrasive particles, said abrasive particles having a concentration of 1-1.2g/cm 3.

7. A system for increasing the strength of a glass substrate, the system comprising:

the polishing device comprises a fixing unit and a polishing fabric, wherein the fixing unit can fix a plurality of glass substrates and enables the side walls of the glass substrates to contact the polishing fabric;

the printing device is used for printing the polished glass substrate so as to form a printing ink layer on the glass substrate;

the fixed unit comprises a limiting pressing plate, a limiting groove is formed in the limiting pressing plate, the areas of the upper surface and the lower surface of the glass substrate are smaller than the bottom area of the limiting groove, the inner side wall of the limiting groove is provided with the polishing fabric, the limiting pressing plate is provided with a rotating shaft perpendicular to the plane of the limiting pressing plate, the limiting pressing plate can rotate around the rotating shaft, and the rotating direction can be changed in the rotating process.

8. The system of claim 7, further comprising: a second polishing fabric disposed over the restraint slot.

9. The system of claim 7 or 8, further comprising: a strengthening device configured to supply the glass substrate, which has been subjected to a strengthening treatment by the strengthening device, into the polishing device.

10. A glass cover plate treated by the method according to any one of claims 1 to 6 or treated by the system according to any one of claims 7 to 9.

11. An electronic device, comprising: the glass cover plate of claim 10.