KR102076025B1 - 3d curved glass and production method thereof - Google Patents

Abstract

The present invention comprises the steps of manufacturing a flat glass by processing the original glass using a laser; Chamfering the flat glass; Mounting the flat glass on a mold and applying heat to form a curved glass; And it provides a 3D cover glass manufacturing method comprising the step of printing the curved glass in the gravure offset method.

Description

3D cover glass and manufacturing method thereof {3D CURVED GLASS AND PRODUCTION METHOD THEREOF}

The present invention relates to a method of manufacturing a 3D cover glass applied to a mobile device.

Mobile devices such as smart phones, smart watches, tablet PCs, and mobile phones are already widely used with the development of wireless communication technology.

The user inputs information into the mobile device by touching the touch screen.

In this case, the touch screen includes a pressure-sensitive type for inputting a pressure signal and a capacitive type for inputting a signal using a current. In recent years, a capacitive touch screen having excellent reactivity and sensitivity is mainly used.

And the glass (glass) applied to the touch screen is manufactured in a flat shape and is reinforced to prevent damage by impact.

Recently, mobile devices using 3D cover glass are increasing due to convenience, high design demands of consumers, various types of screens, and commercialization of flexible displays.

The 3D cover glass is made by processing a flat glass using a lathe and a CNC, and pressing / heating the flat glass at a constant temperature in a forming mold to form a curved portion.

In recent years, as the proportion of the 3D cover glass to the side of the mobile device increases, there is a demand for a 3D cover glass having a through hole through which various buttons can penetrate the curved portion of the 3D cover glass.

However, since the 3D cover glass is generally made of tempered glass, and the curved portion of the 3D cover glass is particularly unstressed in stress, the 3D cover glass forms a through hole directly in the curved portion of the 3D cover glass by using a conventional wheel scribing method or a water jet method. Is difficult.

On the other hand, the background technology of the present invention is disclosed in Korean Patent No. 10-1457445.

The present invention has been made to solve the above-described problems, and provides a 3D cover glass manufacturing method capable of maintaining good productivity, maintaining a certain level or more, and forming a through hole in a curved portion of the 3D cover glass. do.

3D cover glass manufacturing method of the present invention, the step of manufacturing the original glass by using a laser to produce a flat glass; Chamfering the flat glass; Mounting the flat glass on a mold and applying heat to form a curved glass; And printing the curved glass by a gravure offset method.

The manufacturing of the flat glass may include manufacturing the flat glass by cutting the original glass with a laser, and forming a hole in the flat glass by laser cutting at a predetermined point of the flat glass.

In the step of chamfering the flat glass, the outer shell of the flat glass and the hole may be chamfered.

In the forming of the curved glass, it may be characterized by molding using a mold made of diatomaceous earth.

Since the 3D cover glass manufacturing method of this invention forms curved glass using the formation frame made from diatomaceous earth, mold release property is good.

In addition, the forming frame made of diatomaceous earth does not oxidize due to the nature of the material of the diatomaceous earth, there is no phenomenon that the seed is embedded in the curved glass, so that the polishing process can be omitted, and manufacturing cost and manufacturing time can be reduced.

According to the 3D cover glass manufacturing method, a through hole may be formed in the curved portion without damaging the curved portion of the 3D cover glass.

1 is a flow chart of a 3D cover glass manufacturing method according to an embodiment of the present invention,
Figure 2 is a flow chart of the step of processing the original glass of the 3D cover glass manufacturing method of FIG.
3 is a view illustrating a process of manufacturing a curved glass by the 3D cover glass manufacturing method of FIG.
4 is a conceptual diagram of a 3D glass forming apparatus according to another embodiment of the present invention,
FIG. 5 is a perspective view of a forming mold of the 3D glass forming apparatus of FIG. 4, FIG. 6 is a cross-sectional view of AA of FIG. 4,
7 is a flowchart of a step of forming a through hole in a curved portion of a curved glass of the method of manufacturing a 3D cover glass of FIG. 1,
8 is a flowchart illustrating a step of forming a through hole in the step of forming a through hole in a curved portion of the curved glass of FIG. 7;
FIG. 9 is a cross-sectional view of a curved glass for explaining a step of forming a through hole in a curved portion of the curved glass of FIG. 8;
10 is a cross-sectional view of the through-hole portion of the curved glass of FIG. 9,
FIG. 11 is a view for explaining a process of forming a through hole in a step of forming a through hole in a curved portion of the curved glass of FIG. 7;
12 is a conceptual diagram of a gravure offset printing apparatus for explaining the 3D cover glass manufacturing method of FIG.
FIG. 13 is a perspective view of a jig of the gravure offset printing apparatus of FIG. 12;
14 is a perspective view of a curved glass for explaining the 3D cover glass manufacturing method of FIG.
15 is a view for explaining the elastic roller of the gravure offset printing apparatus of FIG.
16 is a flow chart of the printing step of the manufacturing method of the 3D cover glass of FIG.
FIG. 17 is a flowchart of a step of correcting the light blocking unit of the 3D cover glass manufacturing method of FIG.
18 is a partial plan view of the curved glass of FIG. 15;
19 and 20 are diagrams for describing an operation of correcting a light blocking unit in the cross-sectional view taken along line X-X 'of FIG. 18.

Hereinafter, some embodiments of the present invention will be described in detail with reference to the accompanying drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings.

And in describing the embodiments of the present invention, if it is determined that the detailed description of the known configuration or function related to the understanding of the embodiments of the present invention will not be described in detail.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms.

Hereinafter, a 3D cover glass manufacturing method according to an embodiment of the present invention with reference to the drawings.

1 is a flowchart of a method of manufacturing a 3D cover glass according to an embodiment of the present invention, FIG. 2 is a flowchart of a process of processing the original glass of the method of manufacturing the 3D cover glass of FIG. 1, and FIG. 3 is a 3D cover of FIG. 1. FIG. Is a view illustrating a process of manufacturing curved glass by a glass manufacturing method.

1 to 3, the 3D cover glass manufacturing method of the present invention, the step of processing the original glass (S110), chamfering the flat glass (S120), forming a curved glass (S130) and printing It includes a step (S140).

In the step S110 of processing the original glass, the original glass 10 may be cut into a predetermined shape to manufacture the flat glass 20.

In more detail, in the step S110 of processing the original glass, a laser beam is irradiated to the original glass 10 by a laser beam in the laser cutting device 50 so that the original glass 10 is flat glass. 20 can be cut.

Here, the original glass 10 is made of soda-lime, Gorilla Glass, NEG, etc., and may have a thickness of 0.2 mm to 1.3 mm.

In this case, the laser cutting device 50 may spray a cooling fluid along the cutting path of the laser beam to prevent deformation of the cut portion of the flat glass 20 by the laser beam.

For example, the laser beam irradiated from the laser cutting device 50 may be a CO ₂ laser beam, and the cooling fluid may be water, ethanol, water soluble silicone oil, ethanol, or the like. However, it is not limited thereto.

The step S110 of processing the original glass may include a step S111 of manufacturing a flat glass and a step S112 of forming a hole in the flat glass.

In the manufacturing of the flat glass (S111), the disc glass 10 may be cut using a laser beam of the laser cutting device 50 in a set shape.

In the forming of the hole in the flat glass (S112), the hole 20a may be formed by laser cutting of the laser cutting device 50 at a predetermined point of the flat glass 20.

Here, the hole 20a may be a point at which buttons, speakers, and the like of the mobile device are installed.

Processing the disc glass (S110) may further include checking a state of the flat glass (S113).

In the checking of the state of the flat glass (S113), after checking the defect of the flat glass 20 processed by the laser beam, the flat glass 20 in which the defect is confirmed may be removed.

In step S120 of chamfering the flat glass, an outer edge of the flat glass 20 cut by a laser or a sharp edge of the hole 20a of the flat glass 20 may be removed.

Chamfering of the flat glass 20 may be performed using a computer numerical control chamfer device.

When the chamfering operation of the flat glass 20 is completed in step S120 of chamfering the flat glass, the flat glass 20 may be cleaned.

In the forming of the curved glass (S130), the flat glass 20 may be mounted on the forming mold 110 and deformed into curved glass 30 by applying heat.

When molding to the curved glass 30 is completed in the step of forming the curved glass (S130), the curved glass 30 may be cleaned.

In more detail, in the step S130 of forming the curved glass, the flat glass 20 may be molded into the curved glass 30 by using the 3D glass molding apparatus 100.

Hereinafter, the 3D glass molding apparatus 100 will be described in detail.

4 is a conceptual view of a 3D glass molding apparatus according to another embodiment of the present invention, FIG. 5 is a perspective view of a molding frame of the 3D glass molding apparatus of FIG. 4, and FIG. 6 is a cross-sectional view of A-A of FIG. 4.

4 to 6, the 3D glass forming apparatus 100 may include a forming mold 110, a chamber 120, and a transfer unit 130.

The mold 110 provides a curved portion 111 so that the flat glass 20 is deformed by its own weight, and may be made of diatomaceous earth.

However, the material of the mold 110 is not limited to diatomaceous earth, and the mold 110 may be made of a material such as ceramics or graphite.

The forming mold 110 may further include a seating part 112.

Both ends of the flat glass 20 may be seated on the seating part 112, and the curved part 111 may be provided between the seating part 112 and bent downward.

Accordingly, when heat provided from the chamber 120 is applied to the flat glass 20, the flat glass 20 is deformed to be in contact with the curved surface of the curved portion 111.

The seating part 112 may include an inclined surface 1121 and a groove 1122.

The inclined surface 1121 includes a first inclined surface 1121a and a second inclined surface 1121b, and the first inclined surface 1121a and the second inclined surface 1121b face each other, and the curved portion 111 It is formed in the form inclined downward toward the.

The groove 1122 may be formed at a lower end of the inclined surface 1121, and both ends of the flat glass 20 may be inserted and seated therein.

The groove 1122 may include a first groove 1122a formed at the bottom of the first slope 1121a and a second groove 1122b formed at the bottom of the second slope 1121b.

One end of the flat glass 20 is in contact with one of the first inclined surface 1121a and the second inclined surface 1121b, and then slides downward so that the first groove 1122a and the second groove 1122b The other end of the flat glass 20 can be easily inserted into the other of the first groove 1122a and the second groove 1122b when inserted into any one of

Meanwhile, the diatomaceous earth may include aluminum oxide (Al ₂ O ₃ ), silicon dioxide (SiO ₂ ), and ferric trioxide (Fe ₂ O ₃ ).

In more detail, the diatomaceous earth may include 1 to 20 parts by weight of aluminum oxide (Al ₂ O ₃ ), 75 to 95 parts by weight of silicon dioxide (SiO ₂ ), and 1 to 10 parts by weight of ferric trioxide (Fe ₂ O ₃ ). Can be.

The chamber 120 has a heating space 120b formed therein.

The chamber 120 may provide heat of 350 ° C to 750 ° C to the heating space 120b.

Therefore, the flat glass 20 and the molding die 110 transferred to the heating space 120b of the chamber 120 may be provided with heat of 350 ° C. to 750 ° C. by the chamber 120.

When heat is provided between the flat glass 20 and the molding die 110, heat remains between the mold 110 and the flat glass 20 due to the high thermal insulation of cuzoto, and the flat glass Since the surface of the glass 20 may be deformed, the deformation time of the flat glass 20 may be shortened.

The transfer unit 130 may transfer the molding die 110 into and out of the chamber 120. In more detail, the transfer unit 130 transfers the molding die 110 to the heating space 120b through one side of the chamber 120, and the heating space through the other side of the chamber 120. The molding die 110 positioned in 120b) may be transferred to the outside.

In addition, the transfer unit 130 may transfer the molding die 110 in a circulating manner.

Meanwhile, the chamber 120 further includes a first space 120a and a second space 120c, and the transfer unit 130 transfers the molding die 110 from the outside to the first space 120a. The first transfer unit 131, the second transfer unit 132 for transferring the chamber 120 in the heating space (120b), and the transfer of the chamber 120 from the second space (120c) to the outside It may include a third transfer unit 133.

The mold 110 located outside the first door 121 between the first space 120a and the outside is opened, the second door between the first space 120a and the heating space 120b. When the 122 is closed, the first transfer part 131 moves to the second space 120c.

When the first door 121 is closed and the second door 122 is opened, the mold 110 may be moved by the internal transfer part 130 to the heating space 120b.

The curved glass 30 formed in the heating space 120b moves to the second space 120c when the third door 123 between the heating space 120b and the second space 120c is opened. When the third door 123 is closed and the fourth door 124 between the second space 120c and the outside is opened, the forming mold 110 may be transferred to the outside by the third transfer part 133. have.

Example  One_ Mold  Produce

The mold was made of diatomaceous earth containing 12.3% of aluminum oxide (Al ₂ O ₃ ), 80.1% of silicon dioxide (SiO ₂ ), 8.2% of ferric trioxide (Fe ₂ O ₃ ), and residual minerals. , The height and height were 40cm * 15cm * 10cm, and the space between the grooves was 30cm.

Example  2_ Mold  Produce

The mold was made of diatomaceous earth containing 10.2% of aluminum oxide (Al ₂ O ₃ ), 85.3% of silicon dioxide (SiO ₂ ), 5.8% of ferric trioxide (Fe ₂ O ₃ ), and residual minerals. , The height and height were 40cm * 15cm * 10cm, and the space between the grooves was 30cm.

Example  3_ Mold  Produce

The mold was made of diatomaceous earth containing 8.6% of aluminum oxide (Al ₂ O ₃ ), 89.1% of silicon dioxide (SiO ₂ ), 3.2% of ferric trioxide (Fe ₂ O ₃ ), and residual minerals. , The height and height were 40cm * 15cm * 10cm, and the space between the grooves was 30cm.

Experimental example  1_ curved glass  surface  Foreign body inspection

In the molds prepared in Examples 1 to 3, a flat glass 20 having a width, a length, and a thickness of 30 cm * 10 cm * 35 mm was mounted, and the mold and flat glass for 23 minutes in a heating space having a temperature of 720 ° C. Heated 20. The shaped curved glass 30 was removed from the chamber and cooled at room temperature, followed by cleaning.

Unlike the forming mold made of graphite, the forming glass according to Examples 1 to 3 had no foreign matter on the surface of the curved glass 30 manufactured, and was not found as a seed embedded in the curved glass 30.

Experimental example  2_The heat exposure temperature and time Molding  transform

The molds according to Examples 1 to 3 were heated in a chamber at 900 ° C. to measure the strain of the distance from the first groove to the second groove. The heating time of the mold was changed to 20 minutes, 25 minutes, 30 minutes, 35 minutes, 40 minutes.

Table 1 below shows the strain of the mold of Example 1 according to the heating time, Table 2 shows the strain of the mold of Example 2 according to the heating time, Table 3 of Example 3 according to the heating time It shows the strain of the mold.

Episode Heating time Strain One 20min 0.00001 2 25min 0.00001 3 30min 0.00001 4 35min 0.00001 5 40min 0.00001

Episode Heating time Strain One 20min 0.00001 2 25min 0.00001 3 30min 0.00001 4 35min 0.00001 5 40min 0.00001

Episode Heating time Strain One 20min 0.00001 2 25min 0.00001 3 30min 0.00001 4 35min 0.00001 5 40min 0.00001

As shown in Tables 1 to 3, the molding dies according to Examples 1 to 3 were hardly deformed by the temperature, and thus it was confirmed that the molding molds were also suitable for glass requiring precise molding.

Experimental example  3_ Molding  Available count

In the molds prepared in Examples 1 to 3, a flat glass 20 having a width, a length, and a thickness of 30 cm * 10 cm * 35 mm was mounted, and the mold and flat glass for 23 minutes in a heating space having a temperature of 720 ° C. Heat was applied to (20), the curved glass 30 was removed from the chamber, cooled at room temperature, and the operation of removing the curved glass 30 from the molding mold was repeated 3,000 times.

There was almost no change in the curvature of the curved portion of each forming mold and the spacing between the grooves produced in Examples 1 to 3. It was confirmed that the number of use is more than 3000 times.

The 3D cover glass manufacturing method may further include a step (S132) to strengthen the curved glass.

In step S132 of strengthening the curved glass, the curved glass 30 is rapidly frozen after providing heat to the curved glass 30 to compress and deform the surface of the curved glass 30, and the curved glass Tensile deformation of the interior of the glass 30 may increase the mechanical strength of the curved glass 30.

In addition, in step S132 of strengthening the curved glass, the curved glass 30 may be heat-treated in a solution of potassium nitrate (KNO 3) at 390 ° C. to 410 ° C. FIG. In addition, reinforcing layers 30a and 30b may be formed on the surface of the curved glass 30 heat-treated in a potassium nitrate (KNO 3) solution.

In more detail, the curved glass 30 is formed on the outer surface and spaced apart from each other, the first and second reinforcement layers 30a and 30b, and the first and second reinforcement layers 30a and the second reinforcement layer. It may include an inner layer (10c) disposed between (30b).

The 3D cover glass manufacturing method may further include forming a through hole in a curved portion of the curved glass.

7 is a flowchart illustrating a step of forming a through hole in a curved portion of the curved glass of the 3D cover glass manufacturing method of FIG. 1, and FIG. 8 illustrates a through hole in a step of forming a through hole in a curved portion of the curved glass of FIG. 7. 9 is a cross-sectional view of a curved glass for explaining a step of forming a through hole in a curved portion of the curved glass of FIG. 8, and FIG. 10 is a through hole portion of the curved glass of FIG. 9. It is a cross section of.

7 to 10, the forming of the through hole in the curved portion of the curved glass according to an embodiment of the present invention (S133), the curved portion of the curved glass 30 (hereinafter, referred to as "curved portion" (31) ”), a through hole 31h can be formed.

The forming of the through hole in the curved portion of the curved glass (S133) includes forming the through hole (S1331) and polishing the inside of the through hole (S1332).

In the forming of the through hole (S1331), the laser beam 40 is irradiated to the curved portion 31 while moving along the set path to form a through hole 31h penetrating the curved portion 31.

The path set here means an outer line of the through hole 31h to be formed in the curved portion 31, and the wavelength of the laser beam 40 may be 340 nm to 550 nm.

In more detail, in the forming of the through hole (S1331), the laser beam 40 is irradiated while moving along the outer line of the through hole 31h to be formed in the curved portion 31 to expose the through hole. 31h can be formed.

When the laser beam 40 moves along the outer line of the through hole 31h to be formed in the curved portion 31, the laser beam 40 is maintained to be perpendicular to the curved portion 31.

In the forming of the through hole (S1331), the through hole 31h may be formed using a CNC.

FIG. 11 is a diagram for describing a process of forming a through hole in a step of forming a through hole in a curved portion of the curved glass of FIG. 7.

Referring to FIG. 11, in the forming of the through hole (S1331), the curved part 31 alternately irradiates a laser beam 40 having a different wavelength to penetrate the through part 31. 31h can be formed.

For example, the laser beam 40 may include a first laser beam 41 and a second laser beam 42, and the wavelength of the first laser beam 41 is the wavelength of the second laser beam 42. It may be shorter than the wavelength.

In more detail, the wavelength of the first laser beam 41 may be 340 nm to 440 nm, and the wavelength of the second laser beam 42 may be 450 nm to 550 nm.

The forming of the through hole (S1331) may include a first step (S13311), a second step (S13312), and a third step (S13313).

In the first step S13311, the first laser beam 41 is irradiated while moving along the outer line of the through hole 31h to be formed in the curved portion 31, thereby applying the first curved surface 31 to the first curved surface 31. The groove H1 can be formed. The first groove H1 may be formed at a first depth A1 on the outer surface of the curved portion 31.

The first depth A1 refers to the thickness of the first reinforcement layer 30a.

Therefore, in the first step S13311, the first laser beam 41 may remove the first strengthening layer 30a formed on one surface of the curved glass 30.

In the second step S13312, a second groove H2 may be formed by irradiating the second laser beam 42 while moving along the first groove H1.

The second groove H2 is formed to have a second depth A2 which is the thickness of the first reinforcement layer 30a and the second reinforcement layer 30b to be described later.

That is, in the second step S13312, the second laser beam 42 may remove the inner layer 10c of the curved glass 30.

In the third step S13313, the through hole 31h may be formed by irradiating the first laser beam 41 while moving along the second groove H2.

That is, in the third step S13313, the first laser beam 41 may remove the second strengthening layer 30b of the curved glass 30 to form the through hole 31h.

When the through hole 31h is formed to cross the first laser beam 41 and the second laser beam 42 having different wavelengths, the inner surface of the through hole 31h is recessed inwardly. Can be prevented.

In the step S1332 of grinding the inside of the through hole, the inner circumferential surface of the through hole 31h may be polished through the CNC engraving machine.

Meanwhile, in the step S1332 of polishing the inside of the through hole, an inner peripheral surface of the through hole 31h may be polished by spraying an abrasive including silica (SiO ₂ ) -based abrasive grains.

The 3D cover glass manufacturing method may further comprise the step (S134) of checking the state of the curved glass.

In the checking of the state of the curved glass (S134), it may be determined whether the reinforced curved glass 30 is defective, and the flat glass 20 in which the defective is confirmed may be removed.

In the printing step S140, the light blocking unit A may be printed on the edge of the curved glass 30.

FIG. 12 is a conceptual diagram of a gravure offset printing apparatus for explaining the 3D cover glass manufacturing method of FIG. 1, FIG. 13 is a perspective view of a jig of the gravure offset printing apparatus of FIG. 12, and FIG. 14 is a 3D cover glass manufacturing method of FIG. 1. Is a perspective view of a curved glass for explaining.

12 to 14, in the printing step S140, the light blocking unit A may be formed by printing the edge of the curved glass 30 by a gravure offset method.

Herein, the edge of the curved glass 30 means the curved portion 31 extending from an end portion of the flat portion 32, which is a flat portion of the curved glass 30, and formed in a curved surface.

Hereinafter, curved glass 30 extending from both ends of the flat part 32 and including a curved first curved portion 31a and a second curved portion 31b (hereinafter, referred to as “first curved glass” 30) ”for example.

The light blocking portion A formed on the first curved portion 31a and the second curved portion 31b is a hardened printing material 60 transferred by the gravure offset printing apparatus 200.

That is, the light blocking portion A is formed by curing the printing material 60 on the curved portion 31.

The gravure offset printing apparatus 200 includes a pattern roller 210, an elastic roller 220, a transfer unit 230, and a jig 240.

Here, the printing material 60 may include a photoreactive material 61 and an ink 62, and the ink 62 may be black ink for bezels.

The bezel black ink may have a composition such as a black pigment such as carbon black or titanium black, an oligomer, a polyfunctional monomer, an adhesion promoter, a polymerization inhibitor, a surfactant, or the like.

The pattern roller 210 may have a cylindrical shape and a pattern 210a may be formed on a surface thereof. The pattern 210a refers to a groove of the surface of the pattern roller 210.

The gravure offset printing apparatus 200 may further include a blade 250.

The blade 250 may be disposed adjacent to the pattern roller 210, and may scrape the surface of the rotating pattern roller 210 to remove the printing material 60 from the surface of the pattern roller 210.

In more detail, when the blade 250 scrapes the surface of the pattern roller 210, only the print material 60 inside the pattern 210a remains, and the surface of the pattern roller 210 is printed. Material 60 is removed by the blade 250.

The elastic roller 220 is disposed adjacent to the pattern roller 210, it can be rotated in contact with the pattern roller 210.

Therefore, the print material 60 remaining in the pattern 210a may be transferred to the elastic roller 220.

The transfer unit 230 transfers the first curved glass 30 in the first direction D1, which is the direction in which the elastic roller 220 rotates, so that the elastic roller 220 and the first curved glass 30 are rotated. The surface of can be contacted.

In more detail, the first curved glass 30 may be seated on the jig 240, and the jig 240 may be transferred in the first direction D1 by the transfer part 230. In this case, the first curved glass 30 seated on the jig 240 is in contact with the elastic roller 220, and the printing material 60 transferred to the elastic roller 220 is the first curved glass 30. Can be transferred).

15 is a view for explaining the elastic roller of the gravure offset printing apparatus of FIG.

Referring to FIG. 15, the elastic roller 220 may have a shape in which the diameter decreases from the center P1 and the first part toward the outside P2 and the second part.

Here, the second part may be a part spaced apart at the same position from both sides of the first part.

When the elastic roller 220 is in contact with the first curved glass 30, since the elastic roller 220 is deformed so as to contact the first curved glass 30 sequentially from the first portion to the second portion, the first curved glass 30. The problem that air is trapped between the curved glass 30 and the elastic roller 220 can be prevented.

On the other hand, the rear surface 240b of the support surface 240a of the jig 240 supporting the first curved portion 31a and the second curved portion 31b is respectively the first curved portion 31a and the A curved surface symmetrical with the second curved portion 31b may be formed.

When the back surface 240b of the jig 240 is symmetrical with the first curved portion 31a and the second curved portion 31b, respectively, since the deformation of the elastic roller 220, which is curved, is made symmetrical, It is possible to ensure the accuracy of the printing of the curved portion 31.

FIG. 16 is a flowchart of a printing step of the 3D cover glass manufacturing method of FIG. 1.

Referring to FIG. 16, the printing step (S140) includes printing the photoreactive material on the curved surface of the curved glass (S141) and printing the ink on the top surface of the photoreactive material (S142). can do.

That is, in the printing step S140, the photoreactive material 61 and the ink 62 are sequentially printed on the curved portion 31 of the curved glass 30 by the plurality of gravure offset printing apparatus 200. Can be.

The photoreactive material 61 may be made of a material capable of absorbing a laser having a wavelength different from that of the laser 70L having a wavelength absorbed by the ink 62.

For example, when the photoreactive material 61 is made of carbon black, the ink 62 may be made of titanium black.

The pattern 210a may include a first pattern and a second pattern, and the photoreactive material 61 is printed on the curved portion 31 of the curved glass 30 based on the first pattern. The ink 62 may be printed on an upper surface of the photoreactive material 61 printed on the curved portion 31 of the curved glass 30 based on the second pattern.

The width of the first pattern (see D2 in FIG. 15) is preferably larger than the width of the second pattern (see D2 in FIG. 15). Therefore, the ink 62 may be printed only on a portion of the upper surface of the photoreactive material 61.

FIG. 17 is a flowchart of a step of correcting a light blocking unit of the method of manufacturing the 3D cover glass of FIG. 1, FIG. 18 is a partial plan view of the curved glass of FIG. 15, and FIG. 19 and FIG. It is a diagram for explaining a step of correcting the light blocking unit.

17 through 20, in the correcting of the light blocking unit (S150), the light blocking unit A may be irradiated with a laser 70L to correct the light blocking unit A.

That is, in the step of correcting the light blocking unit (S150), a laser 70L is irradiated to the light blocking unit A, which deviates from the set line L of the curved surface 31 of the curved glass 30, so that It is possible to remove the light blocking portion A that deviates from the line L.

The wavelength of the laser 70L is 0.34 μm to 10.64 μm, and the printing material forming the light blocking unit A may be evaporated by reacting with the laser 70L having a wavelength of 0.34 μm to 10.64 μm.

Correcting the light blocking unit (S150) may include a first step (S151) and a second step (S152).

In the first step (S151) while moving the laser 70L to the light blocking unit (A) side is moved in the line (L).

In this case, the laser 70L may evaporate the photoreactive material 61 deviating from the line L. When the photoreactive material 61 is evaporated, it is simultaneously removed with the ink 62 located above the photoreactive material 61.

In the second step S152, after moving the curved glass 30 in a direction away from the laser 70L, the light blocking unit A is irradiated with the laser 70L. Move it.

In the second step S152, the light blocking part A, which is out of the line of the curved part 31 that is not removed in the first step S151, may be removed.

That is, in the second step S152, the light blocking unit A that is not removed in the first step S151 may be removed.

In the above description, it is described that all the elements constituting the embodiments of the present invention are combined or operated in one, but the present invention is not necessarily limited to the embodiments. In other words, within the scope of the present invention, all of the components may be selectively operated in combination with one or more.

In addition, all terms including technical or scientific terms described above have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. Terms used generally, such as terms defined in a dictionary, should be interpreted to coincide with the contextual meaning of the related art, and shall not be interpreted in an ideal or excessively formal sense unless explicitly defined in the present invention.

In addition, the above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

10: disc glass
20: flat glass
30: curved glass
100: 3D glass forming device
200: gravure offset printing device

Claims (4)

Manufacturing a flat glass by processing the original glass using a laser;
Chamfering the flat glass;
Mounting the flat glass on a mold and applying heat to form a curved glass;
Strengthening the curved glass;
Forming a through hole in the strengthened curved glass;
A printing step of forming a light blocking part by printing the edge of the curved glass by a gravure offset method; And
Irradiating a laser to the light blocking unit to correct the light blocking unit,
Forming the through hole,
And irradiating the curved glass with laser beams having different wavelengths alternately to prevent the inner surface of the through hole from being recessed.
The printing step,
Printing a photoreactive material on the edge of the curved glass;
Printing ink on the upper surface of the photoreactive material,
In the correcting step,
And the ink located above the photoreactive material is also removed when the photoreactive material is evaporated by the laser.
The method according to claim 1,
Producing the flat glass,
Cutting the disc glass with a laser to produce the flat glass;
And forming a hole in the flat glass by laser cutting at a predetermined point of the flat glass.
The method according to claim 2,
In the step of chamfering the flat glass 3D cover glass manufacturing method for chamfering the outer shell and the hole of the flat glass.
Manufacturing a flat glass by processing the original glass using a laser;
Chamfering the flat glass;
Mounting the flat glass on a mold and applying heat to form a curved glass;
Strengthening the curved glass;
Forming a through hole in the curved glass;
A printing step of forming a light blocking part by printing the edge of the curved glass by a gravure offset method; And
Irradiating a laser to the light blocking unit to correct the light blocking unit,
Forming the through hole,
And irradiating the curved glass with laser beams having different wavelengths alternately to prevent the inner surface of the through hole from being recessed.
The printing step,
Printing a photoreactive material on the edge of the curved glass;
Printing ink on the upper surface of the photoreactive material,
In the correcting step,
And the ink located above the photoreactive material is also removed when the photoreactive material is evaporated by the laser.

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