JP3392641B2 - Bonding method of irregularly shaped film - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for laminating odd-shaped films used for laminating ends of polarizing films and retardation films.

[0002]

2. Description of the Related Art Conventionally, for example, a polarizing film or a retardation film has been used for manufacturing a liquid crystal display device. The polarizing film allows only light that vibrates in a fixed direction to pass through among lights that vibrate in all directions of 360 degrees and blocks light that vibrates in other directions. 2. Description of the Related Art In a liquid crystal display device (hereinafter, referred to as LCD), the passage and blocking of light is controlled by the orientation of molecules of a polarizing film and a liquid crystal material.

LCD in which liquid crystal molecules are twisted and arranged
In the above, depending on whether the screen color is black or white when no voltage is applied, it is divided into normally black and normally white.

In normally black, as shown in FIG. 7A, when the twist angle of the liquid crystal molecules 51 is 90 degrees, for example, the absorption of two polarizing films 52a and 52b provided on both sides of the liquid crystal molecules 51 is absorbed. The axes are parallel. Therefore, the light passing through the one polarizing film 52a and traveling along the twist of the liquid crystal molecules, the other polarizing film 52b.
Blocked by. Therefore, when the polarizing film 52b side is the screen side, the screen becomes black.

On the other hand, in normally white, FIG.
As shown in, the polarization directions of the two polarizing films 53a and 53b provided on both sides of the liquid crystal molecule 51 are orthogonal to each other. Therefore, the light passing through the one polarizing film 53a and traveling along the twist of the liquid crystal molecules has the other polarizing film 53a.
b also passes. Therefore, when the polarizing film 53b side is the screen side, the screen becomes white.

As described above, when the polarizing film is used for an LCD, it is necessary to set the direction of the absorption axis (hereinafter, simply referred to as the axial direction) according to the twisting direction of the liquid crystal molecules.

As shown in FIG. 8, the basic structure of the polarizing film 54 is that the PVA (polyvinyl alcohol) film 54a which is a polarizer is a cellulosic film.
A sheet of TAC (triacetyl cellulose) film 54b
And the adhesive layer 54d is provided on the outer surface of one TAC film 54b. The PVA (polyvinyl alcohol) film 54a is colored in order to block light other than light vibrating in a certain direction.

Further, the retardation film is provided in the LCD in order to prevent coloration of the screen. For example, TN
(Twisted Nematic) method and TFT (Thin Film Tran)
In the sistor type LCD, since TN liquid crystal is used as a liquid crystal material, the twist angle of the liquid crystal molecules is 90 degrees. On the other hand, in the STN type LCD, the twist angle of the liquid crystal molecules is expanded to 240 degrees or more. For this reason,
The screen of an STN (Super Twisted Nematic) LCD is colored. This coloring is caused by the wavelength dependence of the refractive index of light, and is compensated by the retardation film having the same birefringence as liquid crystal molecules.

The structure of the LCD provided with the retardation film is as follows.
It becomes what is shown in FIG.9 (b). The structure of the LCD when the above coloring occurs is shown in FIG. Figure 9
As shown in (b), the LCD 55 has a liquid crystal cell 56.
Is sandwiched between two retardation films 57a and 57b, and polarizing films 58a and 58b are provided on the outer surfaces of both retardation films 57a and 57b. The retardation films 57a and 57b are, for example, stretched polycarbonate films. LCD
In 55, two retardation films 57a and 57b are used. This is because it is difficult to compensate all wavelengths of color with one retardation film.

The retardation film is, for example, STN type L
When used for a CD, it is necessary to set the optical axis direction (hereinafter, simply referred to as the axial direction) according to the twisting direction of the liquid crystal molecules, like the polarizing film.

For example, in an STN type LCD, as shown in FIG.
As shown in (b), the retardation film 57a and the polarizing film 58a, and the retardation film 57b and the polarizing film 58b are provided on one surface and the other surface of the liquid crystal cell 56. Therefore, the retardation film 57a and the polarizing film 58a, and the retardation film 57b and the polarizing film 58b are each prepared as a pasting film integrally pasted together. Conventionally, pasting of both the above-mentioned films is performed as follows.

The polarizing film is first manufactured as a first strip-shaped film 61, as shown in FIG. At this time, the axial direction coincides with, for example, the longitudinal direction of the first strip film 61. Next, the first strip film 61 is cut to obtain the second strip film 62. Further, the second strip-shaped film 62 is cut to obtain a plurality of rectangular films 63 ... At this time, the first strip film 61 is cut into a predetermined width along the first reference direction SD _1a in order to obtain the second strip film 62. The second strip film 62 is cut into a predetermined width along the second reference direction SD _2a in order to obtain the rectangular film 63.

Similarly, the retardation film has a structure shown in FIG.
First, as shown in, the first strip-shaped film 71 is manufactured. At this time, the axial direction coincides with, for example, the width direction of the first strip film 71. Next, the first strip-shaped film 71
Is cut to obtain a second strip-shaped film 72. Further, the second strip-shaped film 72 is cut into a plurality of rectangular films 73.
Get ... At this time, the first strip film 71 is cut into a predetermined width along the first reference direction SD _1b in order to obtain the second strip film 72. In addition, the second strip 72
To obtain the rectangular film 73, the second reference direction SD
It is cut to a predetermined width along _2b .

Here, the first of the above-mentioned polarizing films
Reference direction SD _1a and second reference direction SD _2a and axial direction SD
_0a, and the first about the retardation film
Reference direction SD _1b and second reference direction SD _2b and axial direction SD
The relationship with _0b is explained.

In the rectangular film 63 of the polarizing film, the axial direction SD _0a is as shown in FIG.
It is inclined at an angle θ _{a with} respect to the second reference direction SD _2a . The first reference direction SD _1a is perpendicular to the second reference direction SD _2a . Similarly, the retardation film rectangular film 7
3, the axial direction SD _0b is inclined by the angle θ _{b with} respect to the second reference direction SD _2b as shown in FIG. 10 (b). The first reference direction SD _1b is perpendicular to the second reference direction SD _2b .

In the example shown in FIGS. 10A and 10B, three rectangular films 63 and 73 are obtained from one second strip-shaped film 62 and 72, and the second strip-shaped film 62 is obtained.
・ The parts on both ends of 72 are scraps 64 and 74, respectively.
Becomes

Thereafter, one rectangular film 63/73 each
The two are bonded to each other to obtain a rectangular bonding film 81 shown in FIGS. Furthermore, this laminating film 8
As shown in FIG. 12, 1 is cut into a size of a liquid crystal cell of a liquid crystal display device, that is, a size of (1 / n) × (1 / m) to obtain a bonded film product.

The pasting of the rectangular films 63 and 73 with each other is conventionally performed by the film pasting device 91 shown in FIG. 13 as follows.

As shown in FIG. 13, the conventional film laminating apparatus 91 has a swirl suction member 92, a moving suction member 93, a first bonding roller 94 and a second bonding roller 95. When laminating the rectangular films 63 and 73 of the polarizing film and the retardation film by the film laminating apparatus 91, first, as shown in FIG. 13, the film laminating apparatus 9 is used.
1 is set to the bonding start preparation state. At this time, the swirl suction member 92 is swung to a horizontal position with the suction surface 92a facing upward, and the movable suction member 93 is moved by the second bonding roller 9
Along with 5, it descends in a horizontal position diagonally downward.

Next, in the above-described state, the rectangular film 73 of a retardation film, for example, is placed on the suction surface 92a of the swirl suction member 92, while the suction surface 9 of the moving suction member 93 is placed.
A rectangular film 63 of a polarizing film is placed on 3a. At this time, the rectangular films 73 and 63 are positioned such that their ends are placed on the first and second bonding rollers 94 and 95, respectively.

Next, a vacuum pump (not shown) connected to the suction passages 92b and 93b of the swirling suction member 92 and the moving suction member 93 is used to evacuate the inside of the swirling suction member 92 and the moving suction member 93. Start. This allows
The rectangular films 73 and 63 have suction surfaces 92a and 9a, respectively.
Adsorbed on 3a.

Here, for example, both sides of the rectangular film 63 are covered with protective films in advance. On the other hand, the rectangular film 73 is provided with an adhesive on the surface to be bonded to the rectangular film 63, this surface is covered with a release film, and the other surface is covered with a protective film. Therefore, in the adsorption state, the protective film and the release film on the bonding surface between the rectangular films 73 and 63 are removed by using a cellophane tape or the like.

Next, as shown in FIG. 14, the swirling suction member 92 swivels around the first bonding roller 94 in the direction of the moving suction member 93, and the moving suction member 93 moves to the second bonding roller 95.
At the same time, the second bonding roller 95 is moved in parallel to the upper position where it is pressed against the first bonding roller 94. When the first and second bonding rollers 94 and 95 are rotated in this state, the rectangular film 73 and the rectangular film 63 are bonded together, and the bonded film 81 is obtained. In this bonding film 81,
The first reference directions SD _1a and SD _1b and the second reference directions SD _2a and SD _2b coincide with each other.

[0024]

However, as shown in FIG.
As shown in (a) and (b), the second strip-shaped film 62.
The area of the end materials 64 and 74 generated when the rectangular film 63 and 73 is cut by cutting 73 is the second strip film 62 and
It occupies a large ratio to the area of 73. Therefore, simply discarding the end materials 64 and 74 causes a large increase in cost of the bonding film 81. Therefore, in order to effectively use the above-described scrap materials 64 and 74,
It is desired to bond each other to form a bonded film.

However, the above-mentioned film laminating apparatus 91
When the above end materials 64 and 74 are pasted together by using, the end materials 64 and 74 are different in shape, and therefore the adhesive agent is provided among these end materials 64 and 74. It is easy for the existing one to wind around one of the first and second bonding rollers 94 and 95. In this case, a laminated film cannot be obtained. That is, when the conventional film bonding apparatus 91 is used, it is difficult to bond the odd-shaped film.

In the pasting method using the conventional film pasting apparatus 91, not only the pasting of the end materials 64 and 74, that is, the odd-shaped films, but also the pasting of the rectangular films 63 and 73 is described below. Causes problems such as.

That is, in the laminating method by the film laminating apparatus 91, as shown in FIG.
3 is sucked onto the suction surfaces 92a and 93a of the swirl suction member 92 and the moving suction member 93, respectively, and a pulling force that overcomes the suction force is applied to the first and second bonding rollers 94 and 95 for the suction. . Therefore, the rectangular film 7
Residual stress locally occurs at 3.63, which adversely affects the function of the bonding film 81.

Further, in the above bonding method, the rectangular film 7
Rectangular film 73 as the bonding of 3.63 progresses
The area of the suction surfaces 92a and 93a covered by 63 decreases. Therefore, the suction force on the suction surfaces 92a and 93a decreases, and the rectangular film 7 on the suction surface 92a side is reduced.
3 easily falls on the rectangular film 63. When this drop occurs, the rectangular films 73 and 63 are bonded in a displaced state, resulting in a bonding failure.

Therefore, the present invention provides a method for laminating a deformed film which, even if the films to be laminated are irregular in shape, is capable of favorably laminating the films without applying residual stress to them. It is intended to be provided.

[0030]

In order to solve the above-mentioned problems, a method for laminating a deformed film according to the invention of claim 1 is directed to a first laminating film having a directionality in the plane direction and a direction in the plane direction. In a method for laminating a deformed film, which comprises forming a laminating film by laminating a second laminating film having a property with an adhesive, the first laminating film and the second laminating film Are different in shape from each other.
The laminating film is arranged on the non-flexible adsorption surface of the first adsorption member that can be adsorbed, while the second laminating film is made of a flexible member that can be adsorbed by the second adsorption member. The flexible film is arranged on the flexible suction surface, and the first bonding film and the second bonding film are polymerized by the relative movement of the first suction member and the second suction member, and then the pressing member is subjected to the flexible suction. By pressing from the back side of the surface, the first laminating film and the second laminating film are sandwiched between the flexible suction surface and the non-flexible suction surface, and in this state, The first bonding film and the second bonding film are bonded by moving the pressing member in the surface direction of the flexible suction surface.

According to the structure of claim 1, the first bonding film is pressed between the flexible suction surface and the non-flexible suction surface by pressing the pressing member from the back side of the flexible suction surface. Since the first bonding film and the second bonding film are bonded by sandwiching the second bonding film and the second bonding film, and moving the pressing member in the surface direction of the flexible suction surface, It is possible to avoid a situation in which the adhesive for bonding the first bonding film and the second bonding film interferes with the bonding operation. As a result, it is possible to satisfactorily bond the odd-shaped both films for bonding.

Further, a large tensile force does not act on both laminating films during laminating, so that a situation in which residual stress is locally generated in both laminating films can be avoided.
This makes it possible to prevent the performance of the produced laminated film from being deteriorated.

Further, both laminating films do not move during laminating, so that laminating misalignment does not occur.

According to a second aspect of the present invention, there is provided a method for laminating a modified film according to the first aspect, wherein at least one of the first laminating film and the second laminating film is the same. It is characterized in that it is an end material film which is produced by cutting out a regular shaped film from a material film and has a defect portion with respect to the regular shaped film.

In the structure of the second aspect, by using the end material film as described above, the material cost can be reduced and the cost of the product film can be reduced.

According to a third aspect of the present invention, there is provided a method for laminating a modified film according to the second aspect, wherein the end material film is the first laminating film or the second laminating film.
A feature is that a plurality of laminating films are arranged and used.

In the structure of claim 3, since a plurality of end material films are arranged and used as one laminating film,
The scrap film can be used more effectively. As a result, cost reduction of the product film can be further promoted.

According to a fourth aspect of the present invention, there is provided a method for laminating a modified film according to any one of the first to third aspects, wherein the first film for laminating and the second film for laminating are the same. One of the films is a polarizing film, and the other is a retardation film.

According to the structure of claim 4, a good quality film, for example, used in an STN liquid crystal display device, in which a polarizing film and a retardation film are laminated, can be obtained at low cost.

[0040]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. The method for laminating the irregularly shaped film is performed using the film laminating apparatus 1 shown in FIG. This film laminating apparatus 1 includes a swirl suction member 2 (first
It has a suction member), a fixed suction member 3 (second suction member), a turning drive unit 4, a bonding operation unit 5, and a base 6. The fixed suction member 3 and the turning drive unit 4 are provided on the base 6,
The swirl suction member 2 is connected to the base 6 via a swivel drive unit 4.

The swivel suction member 2 has a suction surface 2a (non-flexible suction surface) on the surface facing the fixed suction member 3 in the state shown in FIG. A large number of suction holes 2b ... Which communicate with the internal space of the swirl suction member 2 are formed on the suction surface 2a. A suction passage 2c is formed in the swirl suction member 2, and a vacuum pump (not shown) for vacuuming the internal space of the swirl suction member 2 is connected to the suction passage 2c.

The fixed suction member 3 is formed with a suction sheet 3a (flexible member) on the surface facing the swirl suction member 2 in the state shown in FIG. The surface of the suction sheet 3a is a flexible suction surface. The suction sheet 3a is a flexible breathable sheet made of, for example, a silk screen, and is provided substantially horizontally. A suction passage 3b is formed in the fixed suction member 3 as in the swirl suction member 2, and the suction passage 3b is formed.
A vacuum pump (not shown) for vacuuming the internal space of the fixed adsorption member 3 is connected to b.

The turning drive unit 4 has a rotating shaft 4a, and rotates the turning attracting member 2 about the rotating shaft 4a. The swivel suction member 2 is moved by the swivel driving unit 4 as shown in FIG. 1 to perform a bonding operation, and as shown in FIG. 2, a retracted position where the upper surface of the fixed suction member 3 is opened. Is driven to rotate. In this retracted position,
The suction surface 2a of the swirling suction member 2 is in a substantially horizontal state facing upward.

As shown in FIGS. 3 (a) and 3 (b), the bonding operation section 5 includes a bonding roller 7 (pressing member), a moving member 8, a moving member guide rail 9, a belt device 10, a roller lifting link mechanism. 11 and a roller mounting member 12. The moving member 8, the moving member guide rail 9, and the belt device 1
0, the roller elevating link mechanism 11 and the roller mounting member 12 are provided at both ends of the laminating roller 7 in the axial direction.

The laminating roller 7 has a cylindrical shape, and has a length in the axial direction of the laminating roller 7 in the suction sheet 3a, that is, a length substantially corresponding to the width of the suction sheet 3a. The bonding roller 7 is rotatably supported by the moving member 8 by the end of the roller shaft portion 7a. The support portion of the roller shaft portion 7a of the moving member 8 has an elongated hole 8a extending in the vertical direction.
Has become. As a result, the bonding roller 7 is movable in the vertical direction within the range of the elongated hole 8a.

The roller mounting member 12 includes the roller shaft portion 7a.
Is provided at the end portion of and has a pressure receiving portion 12a in the lower portion. The roller mounting member 12 is vertically movable together with the bonding roller 7.

The moving member 8 is guided by the moving member guide rail 9 and is movable. The moving member guide rail 9 extends in a direction orthogonal to the direction of the roller shaft portion 7a.

The roller elevating link mechanism 11 includes the upper link 1
It has a la and a lower link 11b. Down link 11
The lower end of b is rotatably fixed to the moving member 8. The upper end of the upper link 11a has a roller mounting member 12
Abuts on the lower surface of the pressure receiving portion 12a.

The belt device 10 moves the belt 10a by a pair of rollers 10b (one of which is not shown). The belt 10a includes upper and lower links 11a.
The engagement member 11c provided at the connecting portion of 11b is connected. The movable range of this engaging member 11c is shown in FIG.
The range is from (a) to FIG. 3 (b).

In the state of FIG. 3 (a), the roller 10b of the belt device 10 is in the counterclockwise direction, that is, the bonding roller 7 is shown in FIG.
It occurs when it is rotated in the direction of moving in the turning drive unit 4 direction (direction A) shown in FIG. At this time, the upper and lower links 11a and 11b bend at their connecting portions, and accordingly,
The laminating roller 7 descends due to its own weight. Therefore, the bonding roller 7 is separated from the suction sheet 3a.

In the state shown in FIG. 3B, the roller 10b of the belt device 10 is in the clockwise direction, that is, the bonding roller 7 is moved to the above-mentioned A position.
It occurs when rotating so as to move in the B direction opposite to the direction. At this time, the upper and lower links 11a and 11
b becomes straight, and the bonding roller 7 is pushed upward accordingly. Therefore, the laminating roller 7 serves as the suction sheet 3a.
Is slightly pushed up and moves in the B direction.

Next, a method for laminating films having directionality in the plane direction using the above-mentioned film laminating apparatus 1,
That is, a method for laminating the retardation film and the polarizing film will be described.

As shown in FIG. 4A, the polarizing film is first manufactured as the first strip-shaped film 21. At this time, the axial direction coincides with, for example, the longitudinal direction of the first strip film 21. Next, the first strip film 21 is cut to obtain the second strip film 22. Further, the second strip-shaped film 22 is cut to form a plurality of rectangular films 23 ...
(Normal shape film) is obtained. At this time, the first strip-shaped film 21 is formed into the first strip-shaped film 21 to obtain the second strip-shaped film 22.
It is cut into a predetermined width along the reference direction SD _1a . Further, the second strip film 22 is cut into a predetermined width along the second reference direction SD _2a in order to obtain the rectangular film 23.

Similarly, the retardation film is first manufactured as the first strip-shaped film 31, as shown in FIG. 4 (b). At this time, the axial direction coincides with, for example, the width direction of the first strip film 31. Next, the first strip-shaped film 3
1 is cut to obtain the second strip film 32. Further, the second strip-shaped film 32 is cut into a plurality of rectangular films 3
3 ... (Regularly shaped film) is obtained. At this time, in order to obtain the second strip-shaped film 32, the first strip-shaped film 31 is
A predetermined width is cut along the first reference direction SD _1b . Further, the second strip film 32 is cut into a predetermined width along the second reference direction SD _2b in order to obtain the rectangular film 33.

[0055] Incidentally, the first reference direction SD _1a and the second reference direction SD _2a to the relationship between the axial direction SD _0a, and the first reference direction SD _1b and the second reference direction of the phase difference film of the polarizing film The relationship between SD _2b and the axial direction SD _0b is as described above.

In the example shown in FIG. 4 (a), two rectangular films 23 are obtained from one second strip-shaped film 22. The end strips of the second strip-shaped film 22 are scraps 24.
Becomes Further, in the example shown in FIG. 4B, two rectangular films 33 are obtained from one second strip film 32,
A first end material 34a and a second end material 34b, which is a smaller piece than the first end material 34a, are generated at the end side portions of the second strip film 32. In addition, since the scraps 24, 34a, and 34b are effectively used as described below, the scraps 24 and 34 are used as much as possible.
The cutting position is set so that a / 34b becomes large. In the state shown in FIGS. 4 (a) and 4 (b), the end pieces 24 of substantially the same size are applied from both ends of the second strip-shaped films 22 and 32.
-Cutting is performed so that 34a and 34b can be obtained.

Thereafter, one rectangular film 23/33 each
By laminating each other, the rectangular laminating film 81 shown in FIGS. 11 (a) and 11 (b) is obtained. Furthermore, the scrap material 24 and the first and second scrap materials 34a and 34b are pasted together to form the structure shown in FIG.
The end material bonding film 41 shown in (a) and (b) is obtained.

Next, a method of bonding the rectangular films 23 and 33 by the film bonding apparatus 1 will be described. In this case, first, as shown in FIG.
To prepare to start laminating. At this time, the swirl suction member 2
Is turning to a position in which the suction surface 2a faces upward and is in a horizontal state. Next, in this state, for example, the rectangular film 23 of a polarizing film is positioned and placed on the suction surface 2a of the swirl suction member 2, while the rectangular film 33 of the retardation film 33 is placed on the suction sheet 3a of the fixed suction member 3. Position and place. In addition, both of the rectangular films 23 and 33 are in a state in which the bonding surface faces up.

Next, a vacuum pump (not shown) connected to the suction passages 2c and 3b of the swirl suction member 2 and the fixed suction member 3 is used to vacuum the inside of the swirl suction member 2 and the fixed suction member 3. Start. As a result, the rectangular films 23 and 33 are respectively attracted to the suction surface 2a and the suction sheet 3a. At this time, as described above, the protective film and the release film on the bonding surface between the rectangular films 23 and 33 are removed using a cellophane tape or the like.

Next, for example, when the laminating start switch (not shown) of the film laminating apparatus 1 is turned on, the swivel drive unit 4 is driven from the state shown in FIG. As shown, the rectangular film 23 is a rectangular film 33.
And becomes a polymerized state. In this state, the first reference direction S of the rectangular film 23 and the rectangular film 33.
D _1a and SD _1b are matched with each other and second reference directions SD _2a and SD _2b are matched with each other.

Next, the belt device 10 is activated and the roller 1
0b rotates clockwise as shown in FIG. 3 (b). As a result, the belt 10a moves, and the engaging member 11c of the roller lifting link mechanism 11 moves in the B direction.
When the engaging member 11c reaches the position shown in FIG. 3B from the position shown in FIG. 3A, the engaging member 11c stops and the upper link 11a and the lower link 11b become straight.
As a result, the roller mounting member 12, that is, the bonding roller 7 is pushed up, and the bonding roller 7 causes the suction sheet 3a.
Is pushed up. Therefore, the rectangular films 23 and 33 are sandwiched between the laminating roller 7 and the suction surface 2a of the turning suction member 2, that is, the suction sheet 3a.

After the engaging member 11c is stopped as described above, the moving member 8 starts moving in the B direction by further moving the belt 10a. Therefore, the bonding roller 7 moves in the B direction while pushing up the suction sheet 3a. Thereby, the rectangular film 23 and the rectangular film 33
Are pasted together, and the pasting film 81 shown in FIG.
Is obtained.

In the above-mentioned bonding method, no tensile force is applied to the rectangular films 23 and 33. In addition, the situation in which the rectangular films 23 and 33 are bonded in a shifted state does not occur. Therefore, the laminating film 81 obtained by the above-mentioned laminating method becomes a good one having no local residual stress or laminating deviation.

Next, the end material 24 by the film bonding apparatus 1
A method of bonding the first and second end materials 34a and 34b to each other will be described. At this time, similarly, first, as shown in FIG. 2, the film bonding apparatus 1 is brought into a bonding start preparation state. Next, in this state, for example, the scrap material 24 of the polarizing film is positioned and placed on the suction surface 2a of the swirl suction member 2, while the first scrap material of the retardation film is placed on the suction sheet 3a of the fixed suction member 3. 34a and 34b are positioned and placed. In this case, the second strip film 32 shown in FIG.
Second end material 34b on one end side of the first end material 34a on that side
The second end material 34b on the other end side is similar to the defective portion of
It is similar to the first end material 34a on that side. Therefore, as shown in FIG. 5 (a), the second end material 34 b forming the triangle can be arranged such that its hypotenuse abuts against the defective portion of the first end material 34 a.

In this state, the first end material 34a and the second end material 34a
The axial direction is the same as that of the end material 34b. That is, the first end material 34
When disposing a and the second end material 34b, it is necessary to dispose them so that their axial directions coincide with each other. Therefore, here, the first reference materials SD _{1b of} the first end material 34a and the second end material 34b are made to coincide with each other. In addition, the axial direction of the end material 24 and the axial direction of the first end material 34a and the second end material 34b are arranged so as to have a prescribed angular relationship, as shown in FIG. Of course is also necessary.

Thereafter, the end material 24 and the first and second end materials 34a and 34b are bonded by the film bonding apparatus 1 in the same manner as in the case of the rectangular films 23 and 33, as shown in FIG.
The end material bonding film 41 shown in (a) and (b) is obtained.

In the above-mentioned bonding method, the adhesive is applied to any of the bonding surfaces of the end material 24 and the first and second end materials 34a and 34b. Good bonding is possible without any hindrance to the bonding operation. In addition, in the laminating operation, each end material 24, 34
Point where tensile force is not applied to a ・ 34b, and each end material 2
The fact that the bonding deviation does not occur in the parts 34, 34a, 34b is the same as in the case of the bonding of the rectangular films 23, 33.

In the above example, the first end material 34a is used.
And the second end material 34b are butted against each other, and the swirl suction member 2
Are arranged on the suction surface 2a. However, the second mill ends 3
If the size of 4b is larger than the defective portion of the first end material 34a, and the relationship in the axial directions does not shift when the release film or the protective film is peeled off, as shown in FIG. So that, for example, the first end material 34a and the second end material 34a
It is also possible to dispose a part of the end material 34b, for example, in a state of being overlapped by about 1 to 2 mm. This is also the case when a plurality of end materials 24 of the polarizing film are used.

Laminating film 8 obtained as described above
1 and the end material laminating film 41, as shown in FIG. 12, for example, the dimensions of the liquid crystal cell of the liquid crystal display device, that is, (1
/ N) x (1 / m), and cut into a laminated film product. Of this product, the first and second scraps 34
The joints between a and 34b and those lacking the end material 24 are discarded.

As described above, according to the method for laminating the irregularly shaped film, a good product of the laminating film can be obtained by using the end materials 24, 34a and 34b of the polarizing film and the retardation film. . Therefore, the cost of the above product can be reduced.

Next, a laminating film obtained by a conventional laminating method by the film laminating apparatus 91 (hereinafter referred to as laminating film A) and an embodiment of the present invention by the film laminating apparatus 1 will be described. The result of comparison with the laminating film obtained by the laminating method shown below (hereinafter referred to as laminating film B) will be described.

Here, the retardation values of the laminated film A and the laminated film B were measured. The measurement was carried out at 5 points (4 corner points and 1 point at the center) of the following sizes by extracting 5 sheets of each of the laminated films A and B produced in the following sizes. The device used for the measurement is MCPD1000 manufactured by Otsuka Electronics Co., Ltd. The unit of retardation value shown in Tables 1 and 2 is nm.

(1) Retardation value of laminated film A Size of the laminated film A: 245 × 160 (mm) Measurement size: 245 x 160 (mm)

[0074]

[Table 1]

(2) Retardation value of the laminated film B Size of the laminated film B: 491 × 319 (mm) Measurement size: 245 x 160 (mm)

[0076]

[Table 2]

In the measurement results of Tables 1 and 2, the average value of the maximum difference in retardation value is 2.6 for the laminated film B and 3.8 for the laminated film A. From this, it was found that the laminated film B had smaller variation in retardation value than the laminated film B, and the characteristics were uniform.

Further, the change in the retardation value affects color unevenness in a liquid crystal display device, for example.
It is considered that the change in the retardation value is mainly caused by a slight change in the orientation direction of the polymer forming the film. From the above results, such a change occurs in a larger width in the laminated film A. Then, it can be seen that the adhesive film B is less likely to cause color unevenness when compared with the adhesive film A, although it is less likely to affect the occurrence of color unevenness in the above range of retardation value change.

Next, the comparison result of the utilization efficiency of the material film between the conventional laminating method by the film laminating apparatus 91 and the main laminating method by the film laminating apparatus 1 will be described.

Here, as the utilization efficiency of the material film, the second band-shaped films 22 and 32 and the second band-shaped films 62 and 72 shown in FIGS. 4 (a) and (b) and FIGS. 10 (a) and (b) are pasted. The area ratio of each film that could be used to make the composite film to the second strip film was examined. The results are shown in Table 3.

The second strip-shaped films 22 and 62 and the second strip-shaped films 32 and 72 have the same shape and the same axial direction. In Table 1, the second strip film 22
62 as the material film A and the second strip film 32.
72 is shown as material film B. Further, in the case of the comparison number 1 and the case of the comparison number 2, the material film A
-The size of B is different. Further, the present bonding method is the bonding method described in the embodiment of the present invention.

[0082]

[Table 3]

As is clear from the results in Table 3, in the present bonding method, the utilization efficiency of the material film is higher than that in the conventional bonding method. Further, due to the difference in utilization efficiency between the material films A and B, the utilization efficiency increases as the angle (axial angle) formed by the axial direction with respect to the second reference direction increases.

[0084]

As described above, in the method for laminating a deformed film according to the invention of claim 1, the first laminating film and the second laminating film have different shapes from each other. The bonding film is arranged on a non-flexible suction surface of the first suction member that can be sucked, while the second bonding film is flexible that is made of a flexible member that can be sucked by the second suction member. Of the first bonding film and the second bonding film by relative movement of the first suction member and the second suction member, and then the pressing member is placed on the flexible suction surface. Of the first laminating film and the second laminating film between the flexible suction surface and the non-flexible suction surface by pressing from the back side of the By moving the member in the surface direction of the flexible suction surface, the first laminating film and the second laminating film A configuration in which pasted the.

As a result, it is possible to avoid a situation in which the adhesive for bonding the first laminating film and the second laminating film obstructs the laminating operation. Therefore, both modified laminating films can be favorably laminated.

Further, a large tensile force does not act on both laminating films during laminating, and it is possible to avoid a situation in which residual stress is locally generated in both laminating films.
Therefore, it is possible to prevent performance deterioration of the produced laminated film.

Further, there is an effect that the laminating films do not move during the laminating and the laminating does not occur.

According to a second aspect of the invention, there is provided a method for laminating a modified film according to the first aspect, wherein at least one of the first laminating film and the second laminating film is the same. In this configuration, a regular shape film is cut out from the material film and is an end material film having a defect portion with respect to the regular shape film.

As a result, in addition to the effect of the first aspect of the invention, the material cost can be reduced and the cost of the product film can be reduced.

According to a third aspect of the present invention, there is provided a method for laminating a modified film according to the second aspect, wherein the end material film is the first laminating film or the second laminating film.
This is a configuration in which a plurality of laminating films are arranged and used.

As a result, in addition to the effect of the invention of claim 2, the end material film can be used more effectively. As a result, it is possible to further reduce the cost of the product film.

According to a fourth aspect of the present invention, there is provided the method for laminating a deformed film according to any one of the first to third aspects, wherein the first laminating film and the second laminating film are used. One of the films is a polarizing film and the other is a retardation film.

Thus, in addition to the effects of the invention of any one of claims 1 to 3, a high-quality film obtained by laminating a polarizing film and a retardation film, which is used in, for example, an STN liquid crystal display device, can be manufactured at low cost. There is an effect that can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic vertical cross-sectional view showing the configuration of a film laminating apparatus used in a method for laminating a modified film according to an embodiment of the present invention.

FIG. 2 is a schematic vertical sectional view showing a bonding start preparation state in the film bonding apparatus shown in FIG.

3 (a) is a front view showing a bonding start preparation state in the bonding operation unit shown in FIG. 1, and FIG. 3 (b) shows a bonding operation state in the bonding operation unit. It is a front view.

4 (a) is an explanatory view of a method for cutting a film for bonding used in the film bonding apparatus shown in FIG. 1 from a material film, and FIG. 4 (b) is for other bonding. FIG. 3 is an explanatory view of a method of cutting the film of FIG.

5 (a) is a plan view showing an edge material-bonded film obtained by bonding the edge materials shown in FIGS. 4 (a) and (b), and FIG. It is a P direction arrow line view in 5 (a).

FIG. 6 is a plan view showing another example of the end material laminating film shown in FIG. 5 (a).

7A is a perspective view showing a schematic configuration of a normally black liquid crystal display device in a TN system, and FIG. 7B is a schematic diagram of a normally white liquid crystal display device in a TN system. It is a perspective view shown.

FIG. 8 is a schematic front view showing the configuration of a polarizing film.

FIG. 9 (a) is a schematic exploded perspective view showing the configuration of a liquid crystal display device not provided with a retardation film, and FIG. 9 (b) is a configuration of a liquid crystal display device provided with a retardation film. FIG. 3 is a schematic exploded perspective view showing FIG.

FIG. 10 (a) is an explanatory view of a method for cutting a film for bonding from a material film in relation to a conventional film bonding method, and FIG. 10 (b) shows another film for bonding. It is explanatory drawing of the method of cutting from a material film.

FIG. 11 (a) is a plan view showing a bonded film obtained by bonding rectangular films together, and FIG. 11 (b) is a front view thereof.

12 is an explanatory view of a product film obtained by cutting the laminating film shown in FIG.

FIG. 13 is a schematic vertical sectional view showing a bonding start preparation state in a conventional film bonding apparatus.

FIG. 14 is a schematic vertical cross-sectional view showing an operating state of the film bonding apparatus shown in FIG.

[Explanation of symbols]

1 Film laminating device 2 Swirling suction member (first suction member) 2a Adsorption surface (non-flexible adsorption surface) 3 Fixed adsorption member (second adsorption member) 3a Adsorption sheet (flexible member) 5 Laminating operation section 7 Laminating roller (pressing member) 22 Second strip film 23 Rectangular film (regular shape film) 24 Mill ends (mill ends film) 32 Second strip film 33 Rectangular film (Regular shape film) 34a First mill ends (mill ends film) 34b Second mill ends (mill ends film)

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-6-71757 (JP, A) JP-A-6-71756 (JP, A) JP-A-4-60611 (JP, A) JP-A-2- 38047 (JP, A) JP-A-63-212903 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B32B 1/00-35/00 B29C 63/00-65/82 G02F 1/1335 510 G09F 9/00 342

Claims (4)

(57) [Claims] 1. A variant of forming a laminating film by laminating a first laminating film having a directionality in the plane direction and a second laminating film having a directionality in the plane direction with an adhesive. In the film laminating method, the first laminating film and the second laminating film have different shapes from each other, and the first laminating film is a non-adhesive non-adsorbable member. The second bonding film is arranged on the flexible suction surface, and the second bonding film is arranged on the flexible suction surface made of a flexible member capable of performing the suction operation of the second suction member. After the first laminating film and the second laminating film are polymerized by relative movement with the member, the pressing member is pressed from the back side of the flexible suction surface to form the flexible suction surface. A first laminating film and a second laminating film are sandwiched between the non-flexible adsorption surface The deformed film characterized in that the first laminating film and the second laminating film are laminated by moving the pressing member in the surface direction of the flexible suction surface in this state. How to paste. 2. At least one of the first laminating film and the second laminating film is an end material film produced by cutting out a regular shaped film from a material film and having a cut portion with respect to the regular shaped film. The method for laminating the odd-shaped film according to claim 1, wherein the irregular-shaped film is laminated. 3. The method for laminating a deformed film according to claim 2, wherein a plurality of the end material films are arranged and used as a first laminating film or a second laminating film. 4. One of the first bonding film and the second bonding film, which is a polarizing film, and the other is a retardation film. The method for laminating irregularly shaped film as described in Crab.