JP2000206334A - Manufacture of optical film laminate chip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of an optical film laminate chip through an optical film laminate easy in handling. SOLUTION: This manufacturing method of an optical film laminate chip such characteristics that a first optical film in a parallelogram shape is bisected along one reference line, to thereby obtain a first bisection 14 and a second bisection 15 of the first optical film, and that the obtained first bisection 14 and the second bisection 15 of the first optical film are laminated on a lengthy second optical film whose optical axis 11 is parallel or perpendicular to the length direction, to thereby obtain a lengthy optical film laminate formed by laminating the first bisection 14 and the second bisection 15 of the first optical film and the lengthy second optical film, and that the obtained lengthy optical film laminate is cut, to thereby obtain an optical film laminate formed by laminating the first bisection 14 and the second bisection 15 of the first optical film and the second optical film, and that the obtained optical film laminate is cut along the reference line, to thereby obtain a rectangular optical film laminate chip 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing an optical film laminate chip.

[0002]

2. Description of the Related Art Optical films such as linear polarizing films and retardation films are important as optical components constituting liquid crystal display devices. Such an optical film is composed of 2
A kind of optical film, that is, a rectangular optical film laminate chip (30) in which a first optical film (10) and a second optical film (20) are laminated may be used by being incorporated in a liquid crystal display device. Many.

The direction of the optical axis of such an optical film in a liquid crystal display device, that is, the direction of the absorption axis of a linearly polarizing film, the direction of the slow axis of a retardation film, etc., greatly affects the display performance of a target liquid crystal display device. These are important elements, and if they are slightly different from the design values, the obtained liquid crystal display device cannot exhibit the intended performance. Therefore, the angle (θ1) of the optical axis (11) of the first optical film and the angle (θ2) of the optical axis (21) of the second optical film with respect to the reference side (31) in the optical film laminate chip incorporated in the liquid crystal display device. )
The optical film laminate chip (30) needs to be strictly controlled (FIG. 9).

Here, the angle (θ1) of the optical axis of the first optical film refers to the angle of the optical axis (11) of the first optical film with respect to the reference side (31) of the optical film laminate chip (30). The angle of the optical axis of the second optical film (θ2) is defined as a positive angle when viewed from one optical film side, and the angle of the optical axis of the second optical film (θ2) refers to the reference side (31) of the optical film laminate chip. The angle of the optical axis (21) when viewed from the first optical film side is a positive angle when counterclockwise is viewed. The reference side (31) is
Rectangular (MNOP) optical film laminate chip (3
0), long side (PM, NO) or short side (MN, OP)
(FIG. 9).

[0005] Such a rectangular optical film laminate chip (30) is made of, for example, a long first optical film and a long second optical film as raw materials, and is formed from the first rectangular optical film chip (16). And the second rectangular optical film chip (26) are cut out independently,
These can be manufactured by a manufacturing method in which they are bonded via a transparent pressure-sensitive adhesive layer (FIG. 10). Here, the long first optical film and the long second optical film used as raw materials are all linearly polarizing film chips,
It is a general material as a raw material of an optical film chip (16, 26) including a retardation film chip, and is usually supplied in a state of being wound on a roll. Further, the pressure-sensitive adhesive layer, for example, a long first optical film, is provided in advance on one surface of the long second optical film,
Cut out these optical film chips (16, 26),
When they are overlapped and pressed, the desired rectangular optical film laminate chip (30) can be obtained.

However, in this manufacturing method, the long first optical film and the long second optical film are separately cut out to the size of the desired optical film laminate chip, and the first optical film chip (16) is cut out. ) And the second optical film chip (26), and furthermore, it is necessary to stack them one by one, which is problematic in terms of manufacturing efficiency.

As a method for solving such a problem, for example, a long first optical film (12) whose optical axis (11) is parallel to the length direction, and the optical axis (21) is parallel to the length direction. A long second optical film (2
2), the first optical film (10) and the second optical film (20) form the optical axis (11) of the first optical film.
Are stacked so that the angle of the optical axis (21) of the second optical film is (θ2−θ1), and a pair of opposite sides (BC, DA) parallel to the optical axis (11) of the first optical film. ) And the optical axis of the second optical film (21)
Parallelogram (ABCD) having another pair of opposite sides (AB, CD) parallel to the optical film laminate (3)
7) (FIG. 11), the vertical and horizontal dimensions of the optical film laminate chip intended for this purpose, the angle (θ1) of the optical axis of the first optical film with respect to the reference side, and the angle of the optical axis of the second optical film (θ1) A method of cutting out the optical film laminate chip (30) according to θ2) can be considered. According to this method, the first optical film and the second optical film are cut at the same time, and a target optical film laminate chip can be manufactured.

However, in this method, a parallelogram (AB)
Since the angle of the vertex constituting (CD) is (θ2−θ1), when (θ2−θ1) is less than 40 °, for example,
When the angle exceeds 0 °, especially when the angle is less than 30 ° or 15 °
When the angle exceeds 0 °, the shape of the optical film laminate (37) becomes an elongated parallelogram (FIG. 11), and the handling tends to be inconvenient.

On the other hand, a long second optical film whose optical axis (21) is perpendicular to the length direction (2)
2) using this and the long first optical film (12) whose optical axis (11) is parallel to the length direction,
First optical film (10) and second optical film (20)
Are laminated such that the angle of the optical axis (21) of the second optical film with respect to the optical axis (11) of the first optical film is (θ2−θ1), and the optical axis (11) of the first optical film is ) And a pair of opposite sides (BC, DA)
And a parallelogram (ABCD) optical film laminate (37) having a pair of opposite sides (AB, CD) orthogonal to the optical axis (21) of the second optical film (FIG. 1).
2) The optical axis of the optical film laminate chip intended for this purpose is determined according to the vertical and horizontal dimensions, the angle of the optical axis of the first optical film with respect to the reference side (θ1), and the angle of the optical axis of the second optical film (θ2). A method of cutting out into a film laminate chip (30) is considered. According to this method as well, the first optical film and the second optical film are cut at the same time, and the desired optical film laminate chip can be manufactured. In this method, a parallelogram (ABC
Since the angle of the vertex constituting D) is (90 ° −θ2 + θ1), the angle of (θ2−θ1) is, for example, less than 40 °, more than 140 °, particularly less than 30 °, Even when the angle exceeds 150 °, the shape of the optical film laminate does not become an elongated parallelogram, and as a result, handling becomes easy. However, in this method, (θ
2-θ1) is, for example, 50 ° or more and 130 ° or less, particularly 60 °
When it is not less than 120 ° and not more than 120 °, the shape of the optical film laminate (37) becomes an elongated parallelogram (FIG. 1).
2), handling tends to be inconvenient.

In the above-mentioned manufacturing method using a long second optical film (22) whose optical axis is parallel to the length direction or a second optical film (22) perpendicular to the length direction, the handling is easy. In order to always obtain the parallelogram optical film laminate (37), it is necessary to use a long second optical film (2).
As 2), it is necessary to selectively use one having an optical axis parallel to the length direction and one orthogonal to the length direction. Depending on the type of the second optical film, two types, one parallel and one orthogonal, are prepared. Is not always easy to do,
In addition, two types of long second optical films had to be provided in correspondence with the type of the angle of (θ2−θ1) in the target optical film laminate chip (30).

[0011]

Therefore, the present inventor has proposed:
(Θ2−θ in the target optical fill laminated chip
Regardless of the value of 1) or the direction of the optical axis of the long second optical film, as a result of earnestly studying to develop a method of manufacturing an optical film laminate chip through an easy-to-handle optical film laminate, An optical film laminate obtained by cutting a specific parallelogram first optical film in half and laminating it in a long second optical film with a specific direction, and then cutting along a specific reference line, Regardless of whether the vertex angle is (θ2-θ1) or the direction of the optical axis of the long second optical film is parallel or orthogonal to the length direction, the target rectangular optical film laminate The present inventors have found that it can be determined by the angle (θ1) formed by the optical axis of the first optical film with respect to the reference side of the chip or the angle (θ2) formed by the optical axis of the second optical film, and have reached the present invention.

[0012]

That is, according to the present invention, a first optical film (10) and a second optical film (20) are laminated, and the first optical film (10) A method for producing a rectangular (MNOP) optical film laminate chip (30) in which the angle formed by the optical axis (11) is θ1 and the angle formed by the optical axis (21) of the second optical film is θ2,

(1) With respect to the optical axis (11), (180 °-
θ1) and a pair of opposite sides (AB, D) parallel to the optical axis (11).
The parallelogram (ABCD) first optical film (13) having C) is placed at (180 ° -θ1) with respect to its optical axis.
(BC, DA) or both ends (B, C, D, A) passing through both ends (B, C, D, A), and one reference forming an angle of θ2 or (90 ° + θ2) with respect to the opposite side (BC, DA) Half along the line (EF), (180 ° relative to the optical axis)
−θ1) and the hypotenuse (BF ′ and E′A, F ″ C and DE ″), and θ2 or (90 ° + θ2) with respect to the hypotenuse
The first half of the first optical film (14) and the first half (14) of the first optical film having half sides (F'E ', E "F") at an angle of A second half cut (15) was obtained (FIG. 1 (c), FIG. 4 (b), FIG. 7 (b)),

(2) The first half (14) and the second half (15) of the obtained first optical film are formed into a long piece whose optical axis (21) is parallel or perpendicular to the length direction. In the second optical film (22), the oblique sides (E'A and F "C) or the parallel sides (AB and CD) of the first half (14) and the second half (15) are parallel to each other. And the half-section (F'E ') of the first half-section (14) is parallel to one edge (IJ) of the elongated second optical film, and the half-section of the second half-section (15) The first half (14) and the second half (1) of the first optical film are laminated so that the side (E "F") is parallel to the other edge (KL) of the long second optical film. (15) and a long second optical film (2
2) and a long optical film laminate (3)
2) (FIG. 2 (a), FIG. 3 (a), FIG. 5 (a), FIG. 6 (a), FIG.
(a)),

(3) The obtained long optical film laminate (32) is divided into the first half (14) and the second half (15) of the first optical film constituting the laminate by the respective parallel sides (15). A
B, CD) or cut along each hypotenuse (F "C and BF ', DE" and E'A) to form a first half (14) and a second half (15) of the first optical film. An optical film laminate (33) on which the second optical film (20) is laminated is obtained (FIG. 2 (b), FIG. 3 (b), FIG. 5 (b), FIG. 6 (b),
Fig. 8 (b)),

(4) Obtained optical film laminate (33)
To a first half of the first optical film (1
4) and the hypotenuses (F ″ C and B) of the second half cut (15)
F ', E'A, and DE "), and cut along a reference line (L2) parallel to the reference line (L2) and a reference line (L3) orthogonal to the reference line (L2). 2 (c), FIG. 3 (c), FIG. 5 (c), FIG. 6 (c), FIG. 8 (c)). One example of the production method of the present invention is shown in FIGS.
FIG. 2 or FIG. 3 shows another example in FIG.
7 and 8 show still another example.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
The present invention will be described in detail based on each example of the manufacturing method of the present invention shown in FIG. 4 to FIG. 5 or FIG. 6, or FIG.

The optical film laminate chip (30) aimed at by the production method of the present invention comprises a first optical film (10).
And the second optical film (20) are laminated. Here, as the first optical film (10), for example, a linear polarizing film, a retardation film and the like can be mentioned.

Examples of the linearly polarizing film include a film obtained by laminating a protective film such as a triacetyl cellulose film on both sides or one side of a polarizer film in which iodine or a dichroic dye is dyed on a polyvinyl alcohol film. Can be Examples of the retardation film include a stretched film obtained by subjecting a polycarbonate film to a stretching treatment such as uniaxial stretching or biaxial stretching.

The first optical film (10) is laminated on the rectangular optical film laminate chip (30) such that the angle formed by the optical axis (11) with respect to the reference side (31) is θ1. (FIG. 9). Here, θ1 is
In the optical film laminate chip (30), when viewed from the first optical film side, the counterclockwise direction is defined as a positive angle. The reference side (31) may be a long side (MN, OP) or a short side (NO, PM) in the rectangular (MNOP) optical film laminate chip (30).
In FIG. 9, the long side (OP) is set as the reference side (31).

As the second optical film (20), in addition to the same retardation film as described above, a property that incident light from a specific angle is scattered and incident light from other angles is transmitted as it is. And a directional film such as a light control film having Examples of such a light control film include "Lumisty" manufactured by Sumitomo Chemical Co., Ltd.

The second optical film (20) is laminated on the rectangular optical film laminate chip (30) such that the angle formed by the optical axis (21) with respect to the reference side (31) is θ2. (FIG. 9). Here, θ2 is
In the optical film laminate chip (30), when viewed from the second optical film side, the counterclockwise direction is defined as a positive angle.

The present invention relates to a method for manufacturing such an optical film laminate chip (30), wherein the starting material is a parallelogram (ABCD) first optical film (1).
3).

This parallelogram-shaped first optical film has two sets of opposite sides. A pair of opposite sides (BC, D
A) forms an angle of (180 ° −θ1) with respect to the optical axis (11), and the other pair of opposite sides (AB, DC)
It is parallel to the optical axis (11). For example, such a parallelogram-shaped first optical film (13) is formed by moving a long first optical film (12) whose optical axis (11) is parallel to the length direction with respect to the optical axis ( 180 ° -θ
It can be manufactured by cutting along the reference line (L1) forming the angle of 1) (FIG. 1 (a)). Reference line (L1)
, That is, the length of the side AB in the parallelogram, that is, the length of the side CD is the vertical and horizontal dimensions of the target optical film laminate chip (30), and the long second optical film (22) to be used. Is appropriately selected according to the width of the sheet.

In the manufacturing method of the present invention, first, the parallelogram-shaped first optical film (13) is cut in half (FIGS. 1 (b), 4 (b) and 7 (b)).

The half is divided into opposite sides (BC, DA) or both ends (B, C, C) forming an angle of (180 ° -θ1) with respect to the optical axis of the parallelogram-shaped first optical film (13).
D, A) and one reference line (EF) that forms an angle of θ2 or (90 ° + θ2) with the opposite side (BC, DA).
(FIG. 1 (b), FIG. 4 (a), FIG. 7 (a)). The reference line (EF) is a pair of opposite sides (BC and DA)
(FIG. 1 (b), FIG. 4 (a)). In addition, one of the pair of sides (BC or DA) may intersect with the other side (DA or BC), and in this case, both end portions (D
Or A, or B or C). Further, it may pass through both end portions (B or C and D or A) without intersecting with any of them (FIG. 7 (b)). Here, the both end portions do not need to be strictly each vertex, but may be in the vicinity of each vertex within a practical range.

The reference line (EF) is (18) with respect to the optical axis.
It is necessary to make an angle of θ2 or (90 ° + θ2) with respect to the opposite side (BC, DA) forming an angle of 0 ° -θ1). 2
Any one is selected according to the direction of the optical axis (21) in 2), and when the optical axis (21) is parallel to the length direction of the long second optical film (22), the angle is selected. Is θ2, and when orthogonal, the angle is (90 ° + θ2)
It is.

The position of the reference line (EF), that is, the distance DE or the distance EA or the distance BF or the distance FC is determined by the size (vertical dimension, horizontal dimension) of the target optical film laminate chip, and It is appropriately selected according to the width of the two optical films (22) and the like. By being cut in half along the reference line (EF), the parallelogram-shaped first optical film (13) becomes the first half (14) and the second half (1).
5) (FIG. 1 (c), FIG. 4 (b), FIG. 7 (b)).
The method for cutting in half is not particularly limited, and can be cut in half by an ordinary method using, for example, a super cutter or the like.

The first half (14) of the first optical film thus obtained is (180 ° -θ1) with respect to the optical axis.
(BF 'and E'A) and a half-cut side (F') forming an angle of .theta.2 or (90.degree. +. Theta.2) with respect to the hypotenuse.
E ′) and a parallel side (A) parallel to the optical axis (11).
B). Similarly, the second half (15) also has a hypotenuse (F "C and DE") forming an angle of (180 ° -θ1) with respect to the optical axis, and θ2 or (90 ° + θ2) with respect to the hypotenuse. Half cut edge (E "F")
And a parallel side (CD) parallel to the optical axis (11).

Next, the first half (14) and the second half (15) of the obtained first optical film are laminated on a long second optical film (22) to form a long optical film. A laminate (32) is obtained (FIGS. 2 (a), 3 (a), 5).
(a), FIG. 6 (a), FIG. 8 (a)).

The long second optical film (22) has an optical axis (21) parallel or perpendicular to the longitudinal direction. The parallelogram-shaped first optical film (13) is placed along a reference line (EF) that forms an angle of θ2 with the opposite side (BC, DA) that forms an angle of (180 ° −θ1) with the optical axis. When cut in half, a long second optical film (22) whose optical axis (21) is parallel to the length direction is used (FIG. 2 (a), FIG. 3 (a), FIG. 8 (a)). When the optical axis (2) is cut in half along the reference line (EF) having an angle of (90 ° + θ2),
1) is orthogonal to the length direction (FIGS. 5A and 6A).

The first half (14) and the second half (1)
5) are stacked such that their parallel sides (AB and CD) are parallel and adjacent to each other (FIG. 2 (a), FIG. 5 (a),
FIG. 8 (a)) or each hypotenuse (E′A and F ″ C)
Are stacked so as to be adjacent to each other in parallel (FIG. 3
(a), FIG. 6 (a)). The first half-section (14) is laminated such that the half-section (F'E ') is parallel to one edge (IJ) of the long second optical film, and the second half-section (14) is formed. 15) are laminated such that the half cut side (E "F") is parallel to the other edge (KL) of the long second optical film (FIGS. 2 (a), 5 (a), 8 (a), 3 (a) and 6 (a)).

The first half (14) and the second half (15)
Is not particularly limited as long as the above condition is satisfied. In addition to the size of the target optical film laminate chip (30), a long second optical film (22) to be used is used. ) May be adjusted according to the width so that the area can be used most effectively.

The lamination is usually performed via an adhesive layer, and the adhesive layer may be provided on the first optical film in advance, or may be provided on the second optical film. The adhesive constituting the adhesive layer is not particularly limited as long as it is transparent. Usually, a pressure-sensitive adhesive (adhesive) is used. Specifically, for example, an acrylic pressure-sensitive adhesive (acrylic adhesive) is used. Agents), urethane-based pressure-sensitive adhesives (urethane-based adhesives) and the like. The thickness of the adhesive layer is usually 10 to 5
It is about 0 μm.

Next, the obtained long optical film laminate (32) is cut to obtain an optical film laminate (33) (FIGS. 2 (b), 3 (b), 5 (b)). , FIG. 6 (b), FIG.
(b)). The cutting is performed by cutting the first half of the first optical film (1).
4) and the hypotenuses (F ″ C and B) of the second half cut (15)
F ', DE "and E'A) or each parallel side (AB, CD)
It is done along.

The first half (14) and the second half (1)
5) is laminated on the long second optical film (22) such that the parallel sides (AB and CD) are parallel and adjacent to each other, and the oblique sides (F "C and BF ', DE") And E'A) (FIG. 2 (b), FIG. 5 (b), FIG. 8).
(b)).

As described above, the long optical film laminate (3)
The optical film laminate (33) obtained by cutting 2) is obtained by laminating the first optical film (10) and the second optical film (20), and the optical axis (21) of the second optical film. To the opposite side (E ")
F ″, F′E ′), and the first optical film (20) has a straight line (CD, A) parallel to its optical axis (11).
B) is divided into two parts (FIG. 2)
(b), FIG. 5 (b), FIG. 8 (b)). Therefore, in this optical film laminate (33), the optical axis (11) of the first optical film can be recognized as a straight line (CD, AB) that divides the first optical film (10) into two, and Since the optical axis (21) of the film can be recognized as the opposite side (E "F", F'E ') parallel or orthogonal to the optical axis (21), both optical axes (11, 21) can be recognized. ) Can be prevented from being mistaken. In addition, this optical film laminated body (33) is the first optical film (10).
And an optical axis (11) of the first optical film with respect to a reference side (31).
Is θ1 and the optical axis of the second optical film (2
1) An optical film laminate (33) for producing a rectangular optical film laminate chip (30) having an angle of θ2, the optical film laminate (33).
Are the first optical film (10) and the second optical film (2
0) is the angle (θ2) between the optical axis (11) of the first optical film and the optical axis (21) of the second optical film.
−θ1), and the opposite sides (F ″ C and BF ′, E′A and DE ″) forming an angle of (180 ° −θ1) with respect to the optical axis (11) of the first optical film. ) And opposite sides (E "F", F'E ') parallel or orthogonal to the optical axis (21) of the second optical film, and the first optical film (10) has its optical axis (11). ) Are divided into two along a straight line (CD, AB) parallel to (), (FIG. 2 (b), FIG. 5 (b), FIG.

Further, the first half (14) and the second half (15) are placed on the long second optical film (22) with their oblique sides (E'A and F "C) parallel to each other. When they are stacked so as to be adjacent to each other, each parallel side (AB,
CD) (FIG. 3 (b), FIG. 6 (b)).

As described above, the long optical film laminate (3)
The optical film laminate (33) obtained by cutting 2) has a first optical film (10) and a second optical film (20) laminated, and the first optical film (10) and the first optical film (20) are laminated with respect to the reference side (31). The angle formed by the optical axis (11) of the optical film is θ
1 is a rectangular optical film laminate chip (30) in which the angle formed by the optical axis (21) of the second optical film is θ2.
This is an optical film laminate for producing the first optical film (1).
0) and the second optical film (20) are laminated so that the angle formed by the optical axis (21) of the second optical film with respect to the optical axis (11) of the first optical film is (θ1−θ2). And the opposite sides (AB, CD) parallel to the optical axis (11) of the first optical film and the opposite sides (E "F", F ') parallel or orthogonal to the optical axis of the second optical film.
E ′), and the first optical film (10) is divided into two along a straight line (E′A, F ″ C) forming an angle of (180 ° −θ1) with respect to its optical axis. (FIGS. 3 (b) and 6 (b)) Therefore, in this optical film laminate (33), the optics (11) of the first optical film is aligned with the optical axis (11). The optical axis (21) of the second optical film is parallel or perpendicular to the optical axis (21) (E "F"). , F′E ′), the two optical axes (1)
1, 21) can be prevented from being confused. Further, the angle of each vertex is θ1 independent of (θ1-θ2).
And θ2, handling is easy regardless of the value of (θ1−θ2).

Next, the obtained optical film laminate (3
3), and cut into rectangular optical film laminate chips (3
0) is obtained (FIG. 2 (c), FIG. 3 (c), FIG. 5 (c), FIG. 6 (c), FIG. 8 (c)).

The cutting is performed by oblique sides (F ″ C, BF ′, E′A) of the first half (14) and the second half (15) of the first optical film constituting the optical film laminate (33). And DE ") along the reference line (L2) parallel to the reference line (L2) and the reference line (L3) orthogonal to the reference line (L2). By cutting in this manner, the optical film laminate (33) is set at a reference line parallel to the opposite side forming an angle of (180 ° -θ1) with respect to the optical axis (11) of the first optical film constituting the optical film laminate (33). (L2) and the reference line (L3) orthogonal to the reference line.
The cutting line when cutting along the reference line parallel to each oblique side becomes the reference side (31) in the obtained optical film laminate chip (30). In each of FIGS. 2 (c), 3 (c), 5 (c), 6 (c), and 8 (c), most of these reference lines (L2, L3) are omitted. And only a part is displayed.

The cutting method is not particularly limited.
Cutting can be performed by a usual method such as a method using a super cutter or a method using a Thomson blade.

In the production method of the present invention, the optical film laminate (33) passing as an intermediate has a shape of (θ2
Regardless of -θ1), since it is determined only by the values of θ1 and θ2, when the optical axis of the long second optical film used as a raw material is parallel to the length direction (θ2−θ1)
Is less than 30 ° or more than 150 °, or when (θ2−θ1) is more than 30 ° and less than 150 ° when the optical axis of the long second optical film is orthogonal to the length direction. Even if it is, the handling of the optical film laminate (33) is easy. And θ1 is 30 ° or more and 150 ° or less,
Preferably, it is 40 ° or more and 140 ° or less, or θ2
Is from 30 ° to 150 °, preferably from 40 ° to 14 °.
When the angle is 0 ° or less, the handling of the optical film laminate (33) is remarkably improved as compared with the case of passing through the conventional parallelogram optical film laminate (37) (FIGS. 11 and 12). .

[0044]

According to the method of the present invention, it is easy to handle regardless of the value of (θ2−θ1) in the target optical film laminated chip or the direction of the optical axis of the long second optical film. (Θ2−θ1) because an optical film laminate chip can be manufactured via a simple optical film laminate.
, And the productivity of the optical film laminate chip can be improved without being largely affected by the value of, the direction of the optical axis of the long second optical film, and the like.

[0045]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

Example 1 An optical film laminated chip [short side (NO, NO), in which a linear polarizing film (10) and a retardation film (20) are laminated.
PM) is 73 mm, and the long side (MN, OP) is 134
mm, the angle (θ1) formed by the absorption axis (11) with respect to the reference side is 95 °, and the angle (θ2) formed by the slow axis is 45 °. Was produced according to the following steps.

Long linear polarizing film [Sumitomo Chemical Industries
"SH-1832" manufactured by K.K., width 1040 mm, direction of absorption axis (11) is parallel to length direction, and has an acrylic pressure-sensitive adhesive layer (25 μm in thickness) on the back surface. ]
(12) at an angle of 85 ° (= 1) with respect to the optical axis (11).
80 along a reference line (L1) forming an angle of 80 ° -θ1).
It is cut at 0 mm intervals (Fig. 1 (a)) and cut into parallelograms (AB
CD) first optical film (13) was obtained (FIG. 1).
(b)).

The parallelogram (ABCD) first optical film (13) is cut in half along a straight line (EF) intersecting the side BC and the side DA to form a first half cut (14) and a second half cut. (15) was obtained (FIG. 1 (c)). Straight line (EF)
Is 135 ° with respect to the side BC and the side DA (= 90 ° +
θ2), and the distance of DE was 160 mm.

The first half (14) and the second half (15) are converted into a long retardation film [Sumitomo Chemical Co., Ltd.
750 mm in width, "SEF-460570", and the slow axis (21) is orthogonal to the length direction. ], The hypotenuse (E'A) of the first half-section (14) and the hypotenuse (F "C) of the second half-section (15) are parallel and adjacent to each other, and the half-section (F ') of the first half-section is obtained. E ') is along one edge (IJ) of the long second optical film (22), and the half cut (E "F") of the second half cut (15) is the long second optical film (22). ) Was laminated along the other edge (KL) to obtain a long optical film laminate (32) (FIG. 3A).

This long optical film laminate (32)
Is cut along the parallel sides (AB, CD), and the sides F "A, BF ', F'E', E'C, DE",
Cutting along the side E "F", the optical film laminate (3
3) was obtained (FIG. 3 (b)).

The optical film laminate (33) was cut along a reference line (L2) parallel to each hypotenuse (E′A and F ″ C) and a reference line (L3) orthogonal to the reference lines. Thus, 66 optical film laminate chips could be obtained.

Example 2 An optical film laminate chip having a linear polarizing film (10) and a retardation film (20) laminated [short side (NO,
PM) is 152.2 mm, the long side (MN, OP) is a reference side (31) of 201.0 mm, and the angle (θ1) between the reference side and the absorption axis (11) is 85 °. The angle (θ2) formed by the slow axis is 58 °. Was produced according to the following steps.

Long linear polarizing film [Sumitomo Chemical Industries
"SH-1842" manufactured by K.K., width 1040 mm, direction of absorption axis (11) is parallel to length direction. ] (1
2) at 95 ° (= 180 °) with respect to its optical axis (11).
625m along the reference line (L1) making an angle of ° -θ1)
m (Fig. 1 (a)), and cut into parallelograms (ABC
A first optical film (13) of D) was obtained (FIG. 1 (b)).

The first optical film (13) of the parallelogram (ABCD) is cut in half along a straight line (EF) intersecting the side BC and the side DA to form a first half cut (14) and a second half cut. (15) was obtained (FIG. 1 (c)). Straight line (EF)
Intersects the side BC and the side DA at an angle of 58 ° (= θ2), and the distance of the BF is 620 mm.

The first half (14) and the second half (15) are converted into a long retardation film [Sumitomo Chemical Co., Ltd.
750 mm in width, "SEF-460426", and the slow axis (21) is parallel to the length direction. ], The parallel side (AB) of the first half-section (14) and the parallel side (CD) of the second half-section (15) are adjacent to each other in parallel, and the half-section (F'E ') of the first half-section. ) Is along one edge (IJ) of the long second optical film (22), and the half cut edge (E "F") of the second half cut (15) is of the long second optical film (22). Lamination was performed along the other edge (KL) to obtain a long optical film laminate (32) (FIG. 2A).

This long optical film laminate (32)
Was cut along the hypotenuse (E′A and DE ″, F′B and CF ″) to obtain an optical film laminate (33) (FIG. 2).
(b)).

The optical film laminate (33) is converted into a reference line (L2) parallel to each of the oblique sides E'A and DE ", F'B and CF") and a reference line (L3) orthogonal to the reference lines. As a result, 16 optical film laminate chips were obtained.

Example 3 An optical film laminate chip in which a linear polarizing film (10) and a retardation film (20) are laminated [short side (NO,
PM) is 62.4 mm and the long side (MN, OP) is 6
A reference side (31) of 3.2 mm, an angle (θ1) formed by the absorption axis (11) with respect to the reference side is 109 °,
The angle (θ2) formed by the slow axis is 148 °. Was produced according to the following steps.

Long linear polarizing film [Sumitomo Chemical Industries
"SH-1842" manufactured by K.K., width 1040 mm, direction of absorption axis (11) is parallel to length direction. ] (1
2) at an angle of 71 ° (= 180) with respect to its optical axis (11).
926 m along the reference line (L1) making an angle of ° -θ1)
m (Fig. 1 (a)), and cut into parallelograms (ABC
A first optical film (13) of D) was obtained (FIG. 7 (a)).

The first optical film (13) of the parallelogram (ABCD) is cut in half along a straight line (EF) passing through the vertices B and D to form a first half cut (14) and a second half (14). A half-cut (15) was obtained (FIG. 7 (b)). Straight line (EF)
Intersects the side BC and the side DA at an angle of 148 ° (= θ2).

The first half (14) and the second half (15) are converted into a long retardation film [Sumitomo Chemical Co., Ltd.
Made, 600 mm wide, "SEZ", slow axis (21) parallel to length direction. ], The parallel side (AB) of the first half-section (14) and the parallel side (CD) of the second half-section (15) are adjacent to each other in parallel, and the half-section (F'E ') of the first half-section. ) Is one edge (IJ) of the long second optical film (22).
And the half cut side (E "F") of the second half cut body (15) is laminated along the other edge (KL) of the long second optical film (22) to form a long optical film. Laminate (3
2) was obtained (FIG. 8 (a)).

This long optical film laminate (32)
Was cut along the hypotenuse (BC, DA) to obtain an optical film laminate (33) (FIG. 8 (b)).

The optical film laminate (33) was cut along a reference line (L2) parallel to each of the hypotenuses (BC, DA) and a reference line (L3) orthogonal to the reference lines. 182 body chips were obtained.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a step of obtaining a first half and a second half of a first optical film from a long first optical film through a parallelogram first optical film in the manufacturing method of the present invention. FIG.

FIG. 2 is a schematic view showing a process of obtaining an optical film laminate chip from a first half and a second half of the first optical film and a long second optical film in the manufacturing method of the present invention. It is.

FIG. 3 is a schematic view showing a process of obtaining an optical film laminate chip from a first half and a second half of the first optical film and a long second optical film in the manufacturing method of the present invention. It is.

FIG. 4 is a schematic view showing a step of obtaining a first half and a second half of the first optical film from the parallelogram first optical film in the manufacturing method of the present invention.

FIG. 5 is a schematic view showing a process of obtaining an optical film laminate chip from a first half and a second half of the first optical film and a long second optical film in the manufacturing method of the present invention. It is.

FIG. 6 is a schematic diagram showing a process of obtaining an optical film laminate chip from a first half and a second half of the first optical film and a long second optical film in the manufacturing method of the present invention. It is.

FIG. 7 is a schematic view showing a step of obtaining a first half and a second half of the first optical film from the parallelogram first optical film in the manufacturing method of the present invention.

FIG. 8 is a schematic view showing a process of obtaining an optical film laminate chip from a first half and a second half of the first optical film and a long second optical film in the manufacturing method of the present invention. It is.

FIG. 9 is a schematic diagram showing the relationship between the optical axes of the optical film laminate chip, as viewed from the first optical film side.

FIG. 10 is a schematic view showing a conventional method for producing an optical film laminate chip.

FIG. 11 is a schematic view showing a conventional parallelogram optical film laminate and a method for producing the same.

FIG. 12 is a schematic view showing a conventional parallelogram optical film laminate and a method for producing the same.

[Explanation of symbols]

10: First optical film 11: Optical axis of first optical film 12: Long first optical film 13: Parallel optical first optical film 14: First half cut of first optical film 15: First optical Second half cut film 16: First optical film chip 20: Second optical film 21: Optical axis of second optical film 22: Long second optical film 26: Second optical film chip 30: Rectangular optical film Laminated chip 31: reference side 32: long optical film laminate 33: optical film laminate 37: parallelogram optical film laminate θ1: angle formed by the optical axis of the first optical film with respect to the reference side θ2 : The angle formed by the optical axis of the second optical film with respect to the reference side L1: Reference line for cutting out the parallelogram first optical film from the long first optical film L2: Optical filter Reference line for cutting out optical film laminate chip from LUM laminate L3: Reference line for cutting out optical film laminate chip from optical film laminate

Continued on front page F-term (reference) 2H049 BA02 BA06 BA25 BA26 BA27 BB03 BB52 BB62 BC01 BC13 BC14 BC22 4F100 AK21 AK25G AK45 AK51G AR00A AR00B BA02 BA26 CB05 EC18 EJ30 GB41 GB90 JL05 JN10 JN10A JN30B

Claims (7)

[Claims] 1. An optical system according to claim 1, wherein the first optical film and the second optical film are laminated, and the angle formed by the optical axis of the first optical film with respect to the reference side is θ1, and the angle formed by the optical axis of the second optical film. Is a method for manufacturing a rectangular optical film laminate chip in which θ is θ2, wherein (180 ° −θ
1) forming a parallelogram-shaped first optical film having a pair of opposite sides forming an angle and a pair of opposite sides parallel to the optical axis, with the opposite side forming an angle of (180 ° −θ1) with respect to the optical axis; An oblique side that passes through both end portions and is cut in half along one reference line that forms an angle of θ2 or (90 ° + θ2) with respect to the opposite side and forms an angle of (180 ° −θ1) with respect to the optical axis. , Θ2 or (90 ° + θ2) with respect to the hypotenuse
Are obtained, and a first half of the first optical film and a second half of the first optical film, each having a parallel side parallel to the optical axis, are obtained. And the second half cut into a long second optical film whose optical axis is parallel or orthogonal to the longitudinal direction, and the parallel sides or oblique sides of the first half cut and the second half cut are parallel to each other. The half of the first half is parallel to one edge of the long second optical film, and the half of the second half is half to the other edge of the long second optical film. To obtain a long optical film laminate in which the first half and the second half of the first optical film and the long second optical film are laminated. The first half of the first optical film that constitutes the long optical film laminate And cutting along each oblique side or each parallel side of the second half-section to obtain an optical film laminate in which the first half-section, the second half-section, and the second optical film of the first optical film are laminated. Cutting the obtained optical film laminate along a reference line parallel to each oblique side of the first half and the second half of the first optical film constituting the laminate, and a reference line orthogonal to the reference line. And obtaining a rectangular optical film laminate chip. 2. A parallelogram-shaped first optical film and a long first optical film whose optical axis is parallel to the length direction are set at an angle of (180 ° -θ1) with respect to the optical axis. 2. A manufacturing method by cutting along a reference line to be formed.
Production method described in 1. 3. A first optical film and a second optical film are laminated, and have opposite sides parallel or orthogonal to an optical axis of the second optical film, and the first optical film is disposed with respect to the optical axis. An optical film laminate, wherein the optical film laminate is divided into two along a parallel straight line. 4. An optical system according to claim 1, wherein the first optical film and the second optical film are laminated, and the angle formed by the optical axis of the first optical film with respect to the reference side is θ1, and the angle formed by the optical axis of the second optical film. Is an optical film laminate for producing a rectangular optical film laminate chip is θ2, the first optical film and the second optical film, the second optical film with respect to the optical axis of the first optical film Are laminated so that the angle between the optical axes of (1) and (2) is equal to (θ2−θ1), and the opposite side that forms an angle of (180 ° −θ1) with the optical axis of the first optical film, and the optical axis of the second optical film. An optical film laminate having an opposite side parallel or orthogonal to an axis, wherein the first optical film is divided into two along a straight line parallel to the optical axis. 5. The optical film laminate according to claim 4,
(180 ° -θ1) with respect to the optical axis of the first optical film
A cutting method along a reference line parallel to the opposite side forming the angle of (1) and a reference line orthogonal to the reference line. 6. The optical system according to claim 6, wherein the first optical film and the second optical film are laminated, and the angle formed by the optical axis of the first optical film with respect to the reference side is θ1, and the angle formed by the optical axis of the second optical film. Is an optical film laminate for producing a rectangular optical film laminate chip is θ2, the first optical film and the second optical film, the second optical film with respect to the optical axis of the first optical film Are laminated so that the angle between the optical axes of (1) and (2) is equal to (θ1−θ2), and the opposite side parallel to the optical axis of the first optical film is parallel or orthogonal to the optical axis of the second optical film. And the first optical film has (18)
An optical film laminate which is divided into two along a straight line having an angle of 0 ° -θ1). 7. The optical film laminate according to claim 6, wherein
A method for manufacturing an optical film laminate chip, comprising cutting along a reference line parallel to a straight line dividing the first optical film and a reference line orthogonal to the reference line.