KR20200052781A - How to attach a film to a curved cover - Google Patents

Abstract

The present invention relates to a method for attaching a film to a curved cover, which is capable of precisely bonding an adhesive film to a curved cover having two or more sides formed as curved surfaces, without generating bubbles. The method for attaching the film to the curved cover according to the present invention comprises: 1) preparing the curved cover having curved surfaces on opposite both sides; 2) preparing the film to be attached to an attachment surface of the curved cover; and 3) attaching the film to be attached sequentially pressing from a center portion of the curved cover in the direction of an edge.

Description

How to attach a film to a curved cover {How to attach a film to a curved cover}

The present invention relates to a method of attaching a film to a curved cover, and more specifically, a curved surface capable of precisely bonding the adhesive film to the curved cover having two or more sides formed as curved surfaces without generating bubbles. It relates to a method of attaching a cover film.

Recently, for convenience of use, touch screen panels have been widely used in mobile communication devices such as mobile phones, tablet PCs, and laptops, and electronic devices such as navigation and TVs.

Generally, a touch screen is used together with a display panel. Recently, a touch screen function is built into a window glass installed on the front surface of a display panel, or a structure or display panel for attaching a film type touch screen to the front surface of a display panel. A structure in which a touch screen pattern is embedded, etc., is implemented inside.

In particular, recently, a structure in which a cover glass made of tempered glass is installed on the front of a touch screen panel for securing and protecting the durability of a surface of an electronic device or a display panel having a touch screen panel or a touch screen function is embedded. It is used a lot.

[0005] Such a cover glass generally has a flat plate shape, but recently, a curved cover having both sides or three sides facing in a flat plate shape cover glass is used. However, it is relatively easy to bond the film to the cover glass of a completely flat plate shape, but it is very difficult to bond the film to the cover glass having two or more curved surfaces. Therefore, there is an urgent need to develop a technology capable of precisely attaching a film to the curved cover without air bubbles.

The technical problem to be solved by the present invention is to provide an attachment method for attaching a film to a curved cover that can precisely adhere an adhesive film to a curved cover having two or more sides formed of curved surfaces without generating bubbles.

A method of attaching a curved cover film according to the present invention for achieving the above-described technical problem includes: 1) preparing a curved cover having curved surfaces on opposite sides; 2) preparing a skin adhesion film to be attached to the attachment surface of the curved cover; 3) attaching the skin adhesion film sequentially pressing from the center portion of the curved cover in the direction of the edge.

In the present invention, the step 1) comprises: a) peeling off the attachment surface protective paper attached to the attachment surface of the curved cover; b) measuring the thickness and appearance of the curved cover to check for defects; c) flipping the curved cover and aligning it to the correct position;

In addition, in the present invention, step b), it is preferable to install the prism on the left and right sides of the curved cover, and inspect the curved cover using the CCD camera and the prism installed on the prism.

In addition, the step 2) in the present invention, d) the step of bringing in the skin adhesion film loaded on the external loading means; e) peeling off the adhesion surface protective paper attached to the attachment surface of the skinned film carried in; f) it is preferable to consist of a small step of the step of checking whether the skin adhesion film is defective or not by checking the printing state and external dimensions.

In addition, in the step d) in the present invention, it is preferable to remove the static electricity present in the skin adhesion film.

In addition, the step 3) in the present invention is preferably made in a vacuum attached chamber.

In addition, in the present invention, the step 3), g) seating the curved cover on the cover seating jig in the attachment chamber; h) covering both edges of the curved cover seated on the cover seating jig so as not to contact the skinning film; i) attaching the central portion of the curved surface cover and the central portion of the dermal film by lowering the adhesive surface of the dermal film toward the lower side to the upper side of the curved cover; j) It is preferable to consist of a small step of; attaching the skin film to the curved cover in full while sequentially pressing from the center part to the edge part of the skin film with the center part attached.

In addition, in the step i) in the present invention, the conveying means for bringing the dermal film into the attachment chamber directly presses the central portion of the dermal film downward and attaches it to the central portion of the curved cover. desirable.

In the present invention, step j) in the present invention, the attachment from the central portion of the skin film to the edge portion using an edge attachment means having an attachment bar guided to move up and down along the shape of the curved cover It is preferable to sequentially attach the skin adhesion film to the curved cover while moving the bar.

In the present invention, in step j) in the present invention, while the cover means covering the edge of the curved cover is moved to the open position by the driving of the edge attaching means, the end of the dermal film is on the side surface of the curved cover. It is preferably attached.

In addition, in the attachment method of the present invention, after performing the step 3), 4) further performing the step of strengthening the bonding force by applying heat while pressing the curved cover to which the skin-attached film is attached to the sealing chamber It is preferred.

In addition, in the attachment method of the present invention, after performing the step 4), 5) it is preferable to further perform the step of measuring the adhesion accuracy of the side surface of the curved cover is attached to the skin film.

In addition, in the step 5) in the present invention, it is preferable to install the prism on the left and right sides of the curved cover, and inspect the curved cover using the CCD camera and the prism installed on the prism.

According to the present invention, there is an advantage of accurately and stably attaching a film to a curved cover having two or more curved surfaces using an attachment bar that precisely attaches the film while moving along the shape of the curved cover having a curved surface.

1 is a process diagram of a method of attaching a curved cover film according to an embodiment of the present invention.
2 is a perspective view showing the structure of an attachment chamber according to an embodiment of the present invention.
3 is a view showing the internal structure of the attachment chamber according to an embodiment of the present invention.
4 is a perspective view showing the internal structure of the attachment chamber according to an embodiment of the present invention.
5 to 13 are views showing a process of attaching the skin adhesion film to the curved cover according to an embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The method of attaching the film to the curved cover according to the present embodiment starts with the step of preparing the curved cover and film, as shown in FIG. 1. In this embodiment, the 'curved cover' refers to that formed by bending both sides or three sides facing each other on a panel having a rectangular shape in a flat plate shape, and is made of a transparent material capable of almost completely passing light. , For example, may be made of glass or plastic.

Meanwhile, the step of preparing the curved cover (S100) and the step of preparing the skin adhesion film (S200) may be simultaneously performed, or any one of the two steps may be performed first. For convenience, the step (S100) of preparing a curved cover will be described first.

In this embodiment, the step (S100) of preparing the curved surface cover may be divided into small steps of peeling of the protective paper, defect inspection, and alignment. First, the protective paper peeling step is to peel the protective paper adhered to the attachment surface to which the skin adhesion film is to be attached by receiving a curved cover loaded on an external loading means such as J-DEC TRAY or CASSETTE. Since the curved cover is installed on the front surface of the display panel, it requires high optical properties such as requiring perfect transparency, and the surface must be perfectly protected during the handling. Therefore, the surface of the curved cover 2 is in a state where a protective paper is attached to prevent damage in the handling process. In this step, the protective film attached to the attachment surface to which the skin adhesion film is attached is peeled off.

Specifically, in this step, the high-pressure adhesive tape wound on the reel in a state where the curved cover is fixed at the correct position can be lifted and horizontally moved in a state of being adhered to one end of the protective paper, and the protective paper can be peeled off. .

Next, the defect inspection step is a step of inspecting the defect by measuring the thickness and appearance of the curved cover.

This step is to prevent the film from being attached to the defective product by finally inspecting whether the curved cover is defective before the film is attached. Specifically, in this embodiment, it is preferable to install the prism on the left and right sides of the curved cover, and inspect the curved cover using the CCD camera and the prism installed on the prism.

Next, the alignment step is a step of overturning the curved cover and aligning the correct position. Specifically, as a preparation step for conveying the curved cover of the protective paper peeling operation to the inside of the attachment chamber, the curved cover is turned over for smooth conveyance of the curved cover, and the curved cover is moved to the correct position for accurate conveying. Alignment is achieved. Of course, this step may be omitted if necessary.

Next, a step (S200) of preparing a skin adhesion film will be described. This step (S200) is a step of preparing a skin adhesion film to be attached to the attachment surface of the curved cover, specifically, the skin adhesion film can be carried out, divided into the inspection step of peeling and defective paper.

First, the step of bringing in the skin adhesion film is a step of bringing the skin adhesion film loaded on the external loading means into a place for peeling the protective paper. Particularly, in this step, it is preferable to simultaneously remove static electricity generated frequently due to the characteristics of the material forming the film. Specifically, the operation of removing static electricity may be performed by further comprising an ionizer and a vibration device on the film transfer means.

Next, the protective paper peeling step is a step of peeling off the attached protective paper attached to the attached surface of the skinned film, which may be made similar to the protective paper peeling step of the curved cover.

Next, the defect inspection step is a step of inspecting whether the defect is by checking the printing state and the external dimensions of the skin adhesion film, and finally inspecting the defect of the skin adhesion film before proceeding with the film adhesion to a defective product. This is to prevent the occurrence of. In this step, unlike the defect inspection on the curved cover, the CCD CAMERA can be inspected from the top without a prism.

Next, the step (S300) of attaching the skin adhesion film to the curved cover proceeds. In this embodiment, this step (S300) is a key step, in order to perfectly adhere the film to the curved cover having a curved structure, without generating bubbles, the adhered film is sequentially directed from the central portion of the curved cover to the edge. Attach while pressing. In addition, in order to minimize the occurrence of bubbles during the attachment process, this step is 10-4

It is preferably made in an attachment chamber that maintains a vacuum of [Torr].

Hereinafter, the structure of the attachment chamber 300 in which this step will proceed is described first, and the process of this step will be described in detail.

In this embodiment, the attachment chamber 300 is specifically shown in FIGS. 2 and 3, the chamber body 310, the cover seating jig 320, the film center attachment portion 330 and the front film attachment And means 340.

First, as shown in FIG. 2, the chamber body 310 is a component in which a constant closed space is formed inside and a gate 312 communicating with the outside is formed on one side wall. That is, the chamber body 310 is a component that forms the overall shape of the attachment chamber 300, has a closed structure to form a vacuum therein, and exhausts by inhaling and discharging the gas inside the chamber A means (not shown in the drawing) is provided, and a gate 312 is provided on one side wall as a passage through which the curved cover 2 and the skinned film 3 can be carried in and out of the attachment chamber. And the gate 312 is interrupted by the gate valve 314, as shown in FIG.

Next, the cover seating jig 320 is installed on the lower side of the chamber body 310, as shown in Figure 3, the curved cover 2 is a component that is seated. In this embodiment, as illustrated in FIG. 3, the upper surface of the cover seating jig 320 corresponds to the shape of the lower surface of the curved cover 2 so that the seated cover 2 does not move while seated. It is preferable that the seating portion 322 is formed in a shape. In addition, the cover seating jig 320 may be provided with a vacuum adsorption unit (not shown in the drawing) to fix the curved cover 2 so as not to move during the film attachment process.

In addition, the cover seating jig 320 according to the present embodiment, as shown in Figure 3, it is preferable that the conveying means entry groove 324 is formed. The conveying means entry groove 324 is formed by opening the central portion of the cover seating jig 320 at an angle in the opposite direction from the gate 312 direction, and the conveying means 400 enters and descends. It is desirable to have a width and height that can be moved slightly. As shown in FIG. 4, the conveying means 400 enters in a state where the conveying means 400 is mounted on the upper surface by using the conveying means entry groove 324, and the curved cover is placed on the cover seating jig 320. (2) You can put down and escape.

Next, the central portion of the film 330, the central portion of the dermal film 3 in the center of the attachment surface of the curved cover 2 seated on the cover seating jig 320 It is an attached component. In this embodiment, the film central attachment portion 330 may be provided separately in the attachment chamber 300, but the conveying means 400 may also perform its role. That is, after the conveying means 400 enters the inside of the attachment chamber 300 in a state where the top surface of the skin adhesion film 3 is adsorbed to the lower side and enters into the inside of the attachment chamber 300, the attachment chamber 300 To receive the coordinate values of the alignment CCD CAMERA installed therein, the skin adhesion film 3 is horizontally moved to the correct position and then descended to attach to the attachment surface of the curved cover 2. At this time, the transport means 400, as shown in Figure 4, is attached by pressing only the central portion of the skin film (3).

Next, the film front attaching means 340 is installed to be elevated on the inner upper side of the chamber body 310, and the dermal film 3 from the central portion on the upper side of the curved cover 2 It is a component that is pressed and attached sequentially to the edge. That is, the film front attachment means 340, the central portion of the skin film (3) by the center portion of the film 330 is attached to the center of the curved cover (2), the skin film ( The rest of 3) is completely attached so that the front surface of the dermal film 3 is attached to the curved cover 2 without bubbles. To this end, in this embodiment, the film front attachment means 340 may be configured to include an attachment bar 342 and an attachment bar driving means 344 as shown in FIG. 3.

First, the attachment bar 342, as shown in Figure 4, is installed to be freely rotatable in a cylindrical shape, as shown in Figure 9, in contact with the upper surface of the skin film (3) It is a component that attaches the skin adhesion film 3 to the curved cover 2. That is, the attachment bar 342 is attached by pressing while rolling from the center portion of the skin film 3 to the edge portion. Therefore, the attachment bar 342 is preferably installed to be freely rotatable on the attachment bar driving means 344. In addition, the attachment bar 342 mediates an elastic coupling means 341 between the attachment bar driving means 344 so as not to apply excessive force to the skin adhesion film 3 or the curved cover 2 during the attachment process. It is preferable to combine. The elastic coupling means 341 may be formed of, for example, a spring or an air cylinder.

On the other hand, in this embodiment, the attachment bar 342, as shown in Figure 9, the two attachment bars 342 are installed in parallel to each other, the skin attachment that has a structure that is horizontally driven in the opposite direction It is preferable because both edges of the film 3 can be attached at the same time.

Next, the attachment bar driving means 344 is a component for lifting and horizontally driving the attachment bar 342, the attachment bar 342 can be moved horizontally along the shape of the curved cover (2). It is to complete the attaching process of the skin adhesion film 3 while driving to be possible. To this end, in this embodiment, the attachment bar driving means 344 is specifically configured as shown in FIG. 3, including a scissor coupling means 343, a guide chem 348, and an elevation driving part 347. can do.

The scissor coupling means 343, as shown in Figure 3, each of the one end is coupled to the two attachment bars 342, has a structure that is cross-linked to be rotatable in the central portion, the other end 346 binds to the guide chem 348.

Using a pair of scissor coupling means 343 in this way, there is an advantage in that two attachment bars 342 can be driven by one lifting driving unit 347.

Next, the guide chem 348, as shown in Figure 4, the other end 346 of the scissor coupling means 343 is installed and installed, to guide the moving direction of the attachment bar 342 It is a component. That is, the shape of the guide groove of the guide cam 348 is manufactured to guide the lift path and the horizontal movement path of the attachment bar 342 perfectly. By this guide cam 348, the simple lifting and lowering operation of the lifting and driving unit 347 is converted into the accurate lifting and horizontal movement of the attachment bar 320.

Next, the lifting driving unit 347, as shown in FIGS. 3 and 4, is a component that elevates the cross-linking unit 345 of the scissor coupling means 343. The lifting driving part 347 simply moves the crossing part 345 of the attachment bar driving means 344 through which the movement path is guided by the guide cam 348 in the vertical direction. .

On the other hand, as shown in FIGS. 3 and 4, the attachment chamber 300 according to the present embodiment may further include a cover edge covering means 350. The cover edge obstruction means 350 is installed on each side edge of the cover seating jig 310, and is a component that covers the upper edges of both sides of the curved cover 2 seated on the cover seating jig 310. . Specifically, the cover edge covering means 350 prevents the edge of the skin film 3 from being first attached to another portion of the curved cover 2 in the process of attaching the skin film 3, and It serves to separate the edges of the skin film 3 and the curved cover 2 so that the edge portion is sequentially attached from the center portion by the driving of the attachment bar 320.

To this end, in this embodiment, the screening means 350 may be configured to include a screening panel 352 and a screening panel rotation means 354, as specifically shown in FIG. 3. First, the cover panel 352 is a component that covers an edge portion from one end of the curved cover 2, and may have a simple long panel shape, and the edge of the skin film 3 is covered with the curved cover ( It has enough width to be separated from 2). In addition, the top surface of the blanking panel 352 is preferably made of a material that is not easily adhered to the adhesive formed on the attachment surface of the skin adhesion film (3).

Next, the blanking panel rotation means 354, as shown in FIG. 3, the blanking position and the curved cover which is a position covering the edge portion of the curved cover 2 of the blanking panel 352 ( It is a component that rotates to the open position, which is the position to open the edge portion of 2). Specifically, as shown in FIG. 3, the blanking panel rotation means 354 rotates the blanking panel 352 to an open position in the process in which the curved cover 2 is seated on the seating jig 310 to stand by. A, as shown in Figure 6, the curved cover 2 is seated, and in the process of the skin film 3 is lowered, the cover panel 352 is rotated to the cover position.

In this state, the edge portion of the dermal film 3 is lifted by the cover panel 352, and as shown in FIG. 8, maintains a spaced state from the curved cover 2. In addition, as shown in Figures 5 and 6, while the attachment bar 342 continues to move while maintaining the adhered film (3) almost to the end while maintaining this state. Then, as shown in FIG. 11, when the attachment bar 342 fully moves to the end of the curved cover 2 while attaching the skin film 3, it is pushed by the attachment bar 342 and rotated to open. Go to the location.

On the other hand, the attachment chamber 300 according to the present embodiment is preferably further provided with an inspection unit 360 for inspecting whether the side of the curved cover 2 seated on the cover seating jig 310 is defective. Do. In this embodiment, the inspection unit 360 is installed on the side of the cover seating jig 310, the inspection prism 362, and is installed on the upper side of the inspection prism 362, through the inspection prism 362 It may be configured to include a camera 364 for checking whether the side of the curved cover 2 is defective. At this time, the camera 364 may be configured as a CCD CAMERA.

The film attachment step (S300) made using the attachment chamber 300 having such a structure is specifically divided into a curved cover seating step, a curved cover edge covering step, a film central portion attaching step, and a film edge attaching step. Can be.

First, the step of seating the curved cover, as shown in FIG. 5 using the conveying means 400, the curved cover 2 prepared from the outside, is brought into the cover seating jig 320 above the attachment chamber After that, it is a step of lowering it to seat the curved cover 2. In this step, the conveying means 400, as shown in FIGS. 5 and 6, enters and descends the upper side of the conveying means entering groove 324, while naturally descending the curved cover 2 to the cover seating jig 320 Put it on. Then, it goes out of the attachment chamber 300 without interference.

At this time, in the step in which the curved cover 2 is brought into the cover seating jig 320 by the conveying means 400, as shown in FIG. 5, the blind panel 352 is rotated to the open position Wait.

Next, a step of covering both edges of the curved cover 2 so as not to be in contact with the dermal film 3 is performed. That is, as illustrated in FIG. 6, after the curved cover 2 is seated on the cover seating jig 320, the blanking panel 352 rotates to the occluded position to cut the edge of the curved cover 2. It is waiting in a covered state.

Next, the step of attaching the central portion of the skin film (3) proceeds. As shown in FIG. 7, this step first moves to the correct upper position of the curved cover 2 in a state where the central portion of the film 3 adsorbs the central portion of the adhered film 3, As shown in FIG. 8, the lower portion descends to attach the central portion of the dermal film 3 to the central portion of the curved cover 2 first.

At this time, the edge of the skin film 3, as shown in Figure 8, does not fall on the cover panel 352, and keeps the spaced apart from the curved cover (2). When this step is completed, the film central attachment part 330 moves to another position and waits. When the film central attachment part 330 is made of the conveying means 400, the conveying means 400 attaches It moves to the outside of the chamber 300 to perform another operation.

Then, the step of sequentially attaching the rest of the skin film 3, that is, the edge portion except for the center portion is sequentially performed. This step is first started as shown in Figure 9, as the attachment bar 342 descends and contacts the central portion of the dermal film 3. The attachment bar 342 is installed in parallel to the two while moving in opposite directions to attach the edge portion of the skin film 3. Particularly, as shown in FIGS. 10 and 11, the attachment bar 342 moves all surfaces of the skin adhesion film 3 on the curved cover 2 while moving along the curved curved shape of the curved cover 2 as it is. It attaches perfectly. At this time, the attachment bar 342 naturally moves along the curved surface of the curved cover 2 while moving along the guide groove of the guide cam 348.

Particularly, in this embodiment, when the attachment bar 342 moves to the end of the curved cover 2, it meets the blanking panel 352, and the blanking panel 352 is also pushed to show in FIG. As shown, it is rotated to the open position.

After attaching all the surfaces of the skin adhesion film 3 in this way, as shown in FIG. 12, the attachment bar 342 moves upward to stand by.

In addition, in the film attaching method according to the present embodiment, after the bonding operation of the dermal film 3 is completed, the adhesion accuracy of the side curved surface of the curved cover 2 to which the dermal film 3 is attached is measured. Step S500 may be further performed. In this step (S500), as shown in FIG. 13, the prism 362 is installed on the left and right sides of the curved cover 2, and the CCD camera 364 and the prism (on the prism 362) are installed. It is preferable to inspect the curved cover 2 using 362) because the side portion of the curved cover 2 can be accurately inspected.

Meanwhile, in the film attaching method according to the present embodiment, after the attaching film 3 is attached, a step (S400) of strengthening the adhesion of the film may be further performed. In this step (S400), the surface cover 2 to which the skin adhesion film is attached may be introduced into a closed chamber and pressurized while applying heat to strengthen the adhesion. The adhesion-strengthening chamber carries the curved cover 3, which has been attached to the film by the attachment chamber 300, into the sealed adhesion-strengthening chamber, removes residual fine bubbles and moisture by simultaneously applying pressure and heat, It is to significantly enhance the adhesion of the skin adhesion film (3).

300: Attachment chamber 310: Chamber body
320: cover seating jig 330: film central attachment
340: film front attachment means 350: cover edge covering means
360: inspection unit 400: conveying means
2: Curved surface cover 3: Skin adhesion film

Claims (13)

1) preparing a curved cover having curved surfaces on opposite sides;
2) preparing a skin adhesion film to be attached to the attachment surface of the curved cover;
3) attaching the skin adhesion film sequentially pressing from the center portion of the curved cover in the direction of the edge; and attaching the film to the curved cover. The method of claim 1, wherein the step 1),
a) peeling off the attachment surface protective paper attached to the attachment surface of the curved cover;
b) measuring the thickness and appearance of the curved cover to check for defects;
c) flipping the curved cover and aligning it to the correct position; a method of attaching a film to the curved cover, characterized in that it consists of a small step. The curved cover of claim 2, wherein the step b) comprises installing prisms on the left and right sides of the curved cover, and inspecting the curved cover using a CCD camera and the prism installed on the prism. How to attach the film to. The method of claim 1, wherein the 2) step,
d) bringing in the skin adhesion film loaded on the external loading means;
e) peeling off the adhesion surface protective paper attached to the attachment surface of the skinned film carried in;
f) a method of attaching the film to the curved cover, characterized in that it consists of a small step of checking the defects by checking the printing state and external dimensions of the skin-adhesive film. According to claim 4, In step d),
A method of attaching a film to the curved cover, characterized in that to remove the static electricity present in the skin adhesion film. The method of claim 1, wherein step 3),
Method for attaching a film to the curved cover, characterized in that made in a vacuum-attached chamber. The method of claim 6, wherein step 3),
g) seating the curved cover on a cover seating jig in the attachment chamber;
h) covering both edges of the curved cover seated on the cover seating jig so as not to be in contact with the skinning film;
i) attaching the central portion of the curved cover and the central portion of the adhered film by descending in a state in which the attached surface of the dermal film faces downward toward the upper side of the curved cover;
j) attaching the dermal film to the curved cover entirely while sequentially pressing from the central portion to the edge portion of the dermal film to which the central portion is attached; How to attach. The method of claim 7, wherein in step i),
A method of attaching a film to a curved cover, characterized in that the conveying means for bringing the dermal film into the attachment chamber directly presses the central portion of the dermal film downward and attaches it to the central portion of the curved cover. The method of claim 7, wherein in step j),
Using the edge attachment means having an attachment bar guided to move up and down along the shape of the curved cover, the surface of the adhered film is sequentially covered by moving the attachment bar from the central portion to the edge portion of the adhered film. Method of attaching the film to the curved cover, characterized in that attached to. The method of claim 7, wherein in step j),
Attaching the film to the curved cover, characterized in that the end of the skin-attaching film is attached to the side of the curved cover while the cover means covering the edge of the curved cover is moved to the open position by the driving of the edge attaching means. Way. According to claim 1, After performing step 3),
4) The method of attaching the film to the curved cover, characterized in that further performing the step of strengthening the adhesive force by applying heat while pressing the curved cover with the skin-attached film into the closed chamber. According to claim 11, After performing step 4),
5) A method of attaching a film to the curved cover, characterized in that it further comprises the step of measuring the adhesion accuracy of the side curved surface of the curved cover to which the skin adhesion film is attached. The method of claim 12, wherein in step 5),
A method of attaching a film to the curved cover, characterized in that prisms are installed on the left and right sides of the curved cover, and the curved cover is inspected using a CCD camera and a prism installed on the prism.

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