KR100632194B1 - Manufacturing method of optical film 3-layer laminated body - Google Patents

Abstract

Provided is a method for cutting out the optical film three-layer laminate chip 51 by one cutting out step by omitting one step of taking out the drawing out into chips.

In the present invention, the optical film three-layer laminate 50 is obtained by cutting the optical film two-layer laminate 40 of parallelogram (ABCD) along the baseline (EF) and obtained the first optical film two-layer laminate ( 41) and the second optical film two-layer laminate 42 were laminated on a strip-shaped third optical film 32 having an optical axis 31 parallel or orthogonal to its longitudinal direction, and then obtained 1st optical film 2-layer laminated body 41 or 2nd optical film 2-layer laminated body 42 which laminated | stacked the strip | belt-shaped 3rd optical film 32 which comprises the optical film 3-layer laminated body 52 of this invention ) And the third optical film 30 are cut along the shape of the region 70 overlapping each other.

Optical film, laminate, cut out process,

Description

A process for the preparation of three layered optical film laminates

1 and 2 are schematic diagrams illustrating a step of obtaining a first optical film two-layer laminate and a second optical film two-layer laminate from the optical film two-layer laminate in the manufacturing method of the present invention, respectively. .

3 and 4 are schematic views showing a step of obtaining an optical film three-layer laminate from a strip-shaped optical film three-layer laminate in the production method of the present invention, respectively.

It is a schematic diagram which shows the process of cutting-out and drawing an optical film 3-layer laminated body chip from the optical film 3-layer laminated body in the manufacturing method of this invention.

6 and 7 are schematic diagrams each illustrating a manufacturing step of the optical film two-layer laminate in the manufacturing method of the present invention.

8 and 9 are schematic diagrams showing the relationship between the optical axes in the optical film three-layer laminate chip, respectively.

It is a schematic diagram which shows the conventional method of manufacturing the rectangular optical film 3-layer laminated chip.

It is a schematic diagram which shows the process of manufacturing an optical film 2-layer laminated body chip from an optical film 2-layer laminated body.

12 and 13 are schematic diagrams each illustrating a first step of the method for manufacturing the optical film three-layer laminate in Example 1. FIG.

FIG. 14: is a schematic diagram which shows the optical film 3-layer laminated body obtained in Example 1, and the process of carrying out cutting-out of an optical film 3-layer laminated body chip from this.

Explanation of the sign

10: first optical film

11: optical axis of the first optical film

12: strip-shaped first optical film

13: square first optical film chip

14: parallelogram first optical film

20: second optical film

21: optical axis of the second optical film

22: strip-shaped second optical film

23: square second optical film chip

30: third optical film

31: optical axis of the third optical film

32: strip-shaped third optical film

33: rectangular third optical film chip

40: optical film two-layer laminate

41: First optical film two-layer laminate

42: second optical film two-layer laminate

43: optical film two-layer laminate chip

44: strip-shaped optical film two-layer laminate

50: optical film three-layer laminate

51: optical film three-layer laminate chip

52: strip-shaped optical film three-layer laminate

60: baseline of the optical film three-layer laminate chip

70: an area where the first optical film two-layer laminate or the second optical film two-layer laminate and the third optical film overlap with each other

θ1: relative angle of the optical axis of the first optical film to the reference line

θ2: relative angle of the optical axis of the second optical film to the reference line

θ3: relative angle of the optical axis of the third optical film to the reference line

θ21: relative angle of the optical axis of the second optical film to the optical axis of the first optical film

θ210: Design value of relative angle of optical axis of second optical film with respect to optical axis of first optical film in optical film three-layer laminate chip

θ31: Relative angle of the optical axis of the third optical film to the optical axis of the first optical film

θ310: Design value of relative angle of optical axis of third optical film with respect to optical axis of first optical film in optical film three-layer laminate chip

ø1: angle formed by the reference line with respect to the optical axis of the first optical film

ø2: angle formed by the cutting line with respect to the longitudinal direction of the band-shaped first optical film

The present invention relates to a method for producing an optical film three-layer laminate.

The optical film represented by a linear polarizing film, retardation film, etc. is important as an optical component which comprises a liquid crystal display device. This optical film is a rectangular optical film three-layer laminate chip 51 in which three kinds of optical films, that is, the first optical film 10, the second optical film 20, and the third optical film 30 are laminated. In many cases, the liquid crystal display is used in a liquid crystal display device.

The direction of the optical axis in the liquid crystal display device of such an optical film, that is, the direction of the absorption axis of the linear polarizing film, the direction of the ground axis of the retardation film, and the like are important factors that greatly affect the display performance of the desired liquid crystal display device. If these differ at least from the design value, the obtained liquid crystal display device may not exhibit desired performance. Therefore, in the optical film 3-layer laminated chip provided in a liquid crystal display device, the relative angle (theta) 1 of the optical axis 11 of the 1st optical film with respect to the reference line 60, and the optical axis 21 of the 2nd optical film The relative angle θ3 of the relative angle θ2 and the optical axis 31 of the third optical film needs to be strictly managed by the optical film three-layer laminate chip 51.

Here, the relative 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 line 60 in the optical film three-layer laminate chip as viewed from the first optical film side. It is an angle which shows clockwise direction as a positive quantity, and the relative angle (theta) 2 of the optical axis of a 2nd optical film removes the angle of the optical axis 21 of the 2nd optical film with respect to the reference line 60 in an optical film 3-layer laminated chip. It is an angle which showed the counterclockwise direction positively from the 1st optical film side, and the relative angle (theta) 3 of the optical axis of a 3rd optical film is the optical axis of the 3rd optical film with respect to the reference line 60 in an optical film 3-layer laminated chip. It is an angle which looked at the angle of (31) from the 1st optical film side, and showed the counterclockwise direction as a positive. Although the reference line 60 is a straight line and an arbitrary direction is selected, for example, the long side direction or the short side direction of the rectangular optical film three-layer laminated chip 51 is long, but also the long side direction is usually selected. (FIG. 8).

Such a rectangular optical film three-layer laminate chip 51 is, for example, as shown in Fig. 10, a band-shaped first optical film 12, a band-shaped second optical film 22 and a band. Using the third optical film 32 having a shape as a raw material, the first optical film chip 13 in a quadrangle, the second optical film 23 in a quadrangle and the third optical film chip 33 in a quadrangle are independently formed therefrom. After cutting out, these can be manufactured by the manufacturing method which joins through a transparent pressure-sensitive adhesive layer. Here, the strip | belt-shaped 1st optical film 12 used as a raw material, the strip | belt-shaped 2nd optical film 22, and the strip | belt-shaped 3rd optical film 32 are both a linear polarizing film chip and retardation film chip. It is common as a raw material of the optical film chips 13, 23, and 33 including these. In addition, the pressure-sensitive adhesive layer is provided in advance on one side of, for example, a band-shaped first optical film, a band-shaped second optical film, or a band-shaped third optical film, and these optical film chips 13, 23 and 33) are cut out, superimposed, and pressed to obtain a desired rectangular optical film three-layer laminate chip 51.

The optical film three-layer laminate chip 51 is a relative angle of the optical axis 21 of the second optical film with respect to the optical axis 11 of the first optical film even if it is assembled and used in another kind of liquid crystal display device. (Theta) 21 and the relative angle (theta) 31 (FIG. 9) of the optical axis 31 of a 3rd optical film with respect to the optical axis 11 of a 1st optical film are often the same. Here, the relative angle θ21 is an angle calculated by Equation 1 and the relative angle θ31 is an angle calculated by Equation 2.

θ21 = θ2-θ1

θ31 = θ3-θ1

On the other hand, as a manufacturing method of the optical film 3-layer laminated chip which cuts, draws out, and bonds the said rectangular 1st optical film chip, the rectangular 2nd optical film chip, and the rectangular 3rd optical film chip, relative angle (theta) 21 And a rectangular first optical film chip, a rectangular second optical film chip, and a rectangular third, for each of the desired optical film three-layer laminate chips, even when manufacturing the optical film three-layer laminated chip in which (θ 31) is common. There is a problem that the optical film chips must be cut out and drawn independently of each other.

As a solution to this problem, for example, as shown in FIG. 11, the first optical film 10 and the second optical film 20 have a second angle with respect to the optical axis 11 of the first optical film. A pair of opposing sides BC and stacked so that the relative angle θ21 of the optical axis 21 of the optical film becomes a predetermined angle θ210, and parallel to the optical axis 11 of the first optical film From the parallelogram (ABCD) optical film two-layer laminate 40 having a pair of opposite sides AB and DC parallel or orthogonal to the optical axis 21 of the AD and the second optical film, 2 layers of optical films according to the horizontal and vertical dimensions of the optical film 3-layer laminated chip 41, the angle (θ1) of the optical axis of the first optical film with respect to the reference line, and the angle (θ2) of the optical axis of the second optical film. The sieve chip 43 is cut out and drawn, and the third optical film chip 33 cut out and drawn out from the strip-shaped third optical film 22 is applied thereto. It can be considered a method of manufacturing. Here, the predetermined angle θ210 is the relative of the optical axis 21 of the second optical film to the optical axis 11 of the first optical film in the liquid crystal display device to which the optical film three-layer laminate chip 51 is applied. The angle design value.

According to this manufacturing method, since the first optical film and the second optical film are simultaneously cut out from the optical film two-layer laminate 40 in a laminated state, a method of separately cutting out the chips 13 and 23 (FIG. Compared to 10), the step of taking out the cutting to the chip is omitted. In addition, since the parallelogram optical film two-layer laminated body 40 can be used as a common intermediate, the force of inventory management can be reduced, and also productivity can be improved.

However, in such a manufacturing method, a third optical film chip is formed from the strip-shaped third optical film 22 separately from the step of cutting out the optical film two-layer laminate chip 43 from the optical film two-layer laminate 40. The process of cutting out and drawing (23) is required.

Therefore, the present inventors earnestly examined to develop a method for cutting out the optical film three-layer laminate chip 51 by one cutting out step by omitting the step of taking out the step out of the chip into one step. The optical film two-layer laminated body 40 is cut along the specific reference line EF, and the 1st optical film two-layer laminated body (= optical film 1st and 2nd layer laminated body) 41 and 2nd optical An optical film obtained by obtaining a film two-layer laminate (= optical film second-two-layer laminate) 42 and then laminating them in a band-shaped third optical film 32 in a specific direction and then cutting them. By passing through the three-layered laminated body 50, it discovered that the process of cutting-out with a chip | tip can be performed once, and came to this invention.

That is, in this invention, the 1st optical film 10, the 2nd optical film 20, and the 3rd optical film 30 are the optical axes of the 2nd optical film with respect to the optical axis 11 of the 1st optical film ( The relative angle θ21 of 21 is a predetermined angle θ210, and the relative angle θ31 of the optical axis 31 of the third optical film with respect to the optical axis 11 of the first optical film is a predetermined angle ( In the manufacturing method of the optical film 3-layer laminated body 50 laminated | stacked so that it may become (theta) 310),

In the first optical film 10 and the second optical film 20, the relative angle θ21 of the optical axis 21 of the second optical film with respect to the optical axis 11 of the first optical film is a predetermined angle ( 1 and 2, and a pair of opposite sides BC and AD parallel to the optical axis 11 of the first optical film and the second optical film, as shown in FIGS. A parallelogram (ABCD) optical film two-layer laminate 40 having a pair of opposing sides AB and DC parallel to (Fig. 1) or orthogonal (Fig. 2) with respect to the optical axis 21 is prepared. 1 cut along a reference line EF that intersects the optical axis 11 of the optical film at a predetermined angle θ310 (FIG. 1) or at an angle ø1 equal to the angle 90 ° + θ310 (FIG. 2) The first optical film two-layer laminate 41 and the second optical film two-layer laminate 42 were obtained (Figs. 1 and 2),

As shown in FIG. 3 and FIG. 4, the obtained first optical film two-layer laminate 41 and the second optical film two-layer laminate 42 are parallel to the longitudinal direction thereof (FIG. 3), or The cutting edge E 'F' of the first optical film two-layer laminate 41 is formed into a band-shaped third optical film 32 having an optical axis 31 orthogonal to each other (Fig. 4). It is parallel to one edge of the 3 optical film (緣邊: GH) and the cut edge (E "F") of the second optical film two-layer laminate 142 is the other edge of the band-shaped third optical film ( Lamination so as to be parallel to IJ) to obtain a strip-shaped optical film three-layer laminate 52,

The 1st optical film 2-layer laminated body 41 or 2nd optical film 2 which laminated | stacked the strip | belt-shaped 3rd optical film 32 which comprises the obtained strip | belt-shaped optical film 3-layer laminated body 52 is obtained. Fabrication of the optical film three-layer laminate 50, characterized in that the cutting (FIGS. 3 and 4) follows the shape of the region 70 where the layer laminate 42 and the third optical film 30 overlap each other. To provide a way.

The desired optical film three-layer laminated body chip 51 can be manufactured by cutting out the obtained optical film three-layer laminated body 50 with a chip | tip as shown in FIG.

Hereinafter, the manufacturing method of the present invention will be described in detail with reference to FIGS. 1 to 8.

In the parallelogram optical film two-layer laminated body 40 used for the manufacturing method of this invention, the 1st optical film 10 and the 2nd optical film 20 are laminated | stacked. As the 1st optical film 10, a linear polarizing film, retardation film, etc. are mentioned, These can use a conventional thing. As the 2nd optical film 20, the film which has directivity like the light control film which has the property which scatters incident light from a specific angle other than retardation film etc. and transmits incident light from other angles as it is, is mentioned. As such a light control film, "Lumisto" by Sumitomo Chemical Company, Limited, etc. are mentioned.

In the parallelogram optical film two-layer laminated body 40, the 1st optical film 10 and the 2nd optical film 20 are normally adhere | attached with a transparent adhesive agent. As a transparent adhesive agent, an acrylic pressure sensitive adhesive, a urethane type pressure sensitive adhesive, etc. can be used, for example. The thickness of an adhesive part is about 10-50 micrometers normally.

Further, in the parallelogram optical film two-layer laminate 40, the first optical film and the second optical film are relative to the optical axis 21 of the second optical film with respect to the optical axis 11 of the first optical film. The angles θ21 are stacked so as to be a predetermined angle θ210. Here, the predetermined angle θ210 is the relative of the optical axis 21 of the second optical film to the optical axis 11 of the first optical film in the liquid crystal display device to which the optical film three-layer laminate chip 51 is applied. It is a design value of an angle, and is an angle which showed the counterclockwise direction positively from the 1st optical film side.

The shape of the optical film two-layer laminated body 40 is parallelogram (ABCD). One pair of opposite sides BC and AD of the two pairs of opposite sides constituting the parallelogram is parallel to the optical axis 11 of the first optical film and the other pair of opposite sides AB and DC Is parallel (FIG. 1) or orthogonal (FIG. 2) with respect to the optical axis 21 of the 2nd optical film.

Such a parallelogram optical film two-layer laminate 40 is, for example, a parallelogram first optical film and a band-shaped second optical film 22 that are cut out and drawn out of the band-shaped first optical film 12. It can manufacture by the method of bonding the parallelogram 2nd optical film cut-out drawn from the ().

In addition, such a parallelogram optical film two-layer laminate 40, as shown in Figs.

① The strip-shaped first optical film 12 is cut along the cutting line C1 and the angle (ø2) equal to the angle (θ21) or (θ21-90 °) with respect to the longitudinal direction of the strip-shaped first optical film. To form two parallel sides AB and DC, and the distance L1 between the two sides is substantially parallel to the width W2 of the band-shaped second optical film 22. Cut out)

(2) In the obtained cut sheet-like first optical film 14, two sides AB and DC of the cut sheet-like first optical film 14 are along both edges KL and MN of the band-shaped second optical film. Laminated on a strip-shaped second optical film 22 to obtain a strip-shaped optical film two-layer laminate 44 in which a parallelogram-shaped first optical film was laminated on a strip-shaped second optical film,

(3) The obtained strip-shaped optical film two-layer laminate 44 is cut along the cutting line C2 along the shape of the stacked parallelogram first film 14, and the first optical film and the second optical film It can manufacture by the manufacturing method which obtains this laminated parallelogram optical film two-layer laminated body 40. FIG.

In this manufacturing method, a parallelogram-shaped first optical film 14 having two parallel sides is formed from the band-shaped first optical film 12 at an angle ø2 with respect to its longitudinal direction. When cutting out, as shown in FIG. 6, when the film which has the optical axis 21 parallel to the longitudinal direction is used as the strip | belt-shaped 2nd optical film 22, the optical axis of a 2nd optical film A parallelogram optical film two-layer laminate 40 having a pair of opposite sides AB and DC parallel to (21) can be obtained. The parallelogram optical film two-layer laminate 40 thus obtained is easy to handle since the angle? 2 is about 40 ° to 90 ° when the angle θ21 is about 40 ° to 90 °.

On the other hand, the parallelogram-shaped first optical film 14 having two parallel sides is formed from the band-shaped first optical film 12 at an angle ø2 equal to the angle θ21-90 ° with respect to its longitudinal direction. When cutting out, as shown in FIG. 7, when the film which has the optical axis 21 orthogonal to the longitudinal direction is used as the strip | belt-shaped 2nd optical film 22, the optical axis of a 2nd optical film A parallelogram optical film two-layer laminate 40 having a pair of opposite sides AB and DC orthogonal to (21) can be obtained. The parallelogram optical film two-layer laminate 40 thus obtained is easy to handle because ø2 is about 40 ° to 90 ° even when the angle θ21 is about 130 ° to 180 °.

Lamination of the first optical film and the second optical film is usually carried out by bonding using a transparent adhesive. As the transparent adhesive, a pressure-sensitive adhesive such as an acrylic pressure-sensitive adhesive or a urethane-based pressure-sensitive adhesive can be used, and these are applied to the first optical film or the second optical film in advance, and the first optical film or the second optical film in advance as the pressure-sensitive adhesive layer. It is preferably installed in.

In the manufacturing method of this invention, as shown in FIG. 1 and FIG. 2, such a parallelogram optical film two-layer laminated body is first predetermined | prescribed with respect to the optical axis 11 of a 1st optical film. The first optical film two-layer laminate 41 is cut along a reference line EF that intersects at an angle θ310 (FIG. 1) or at an angle ø1 equal to the angle 90 ° + θ310 (FIG. 2). The second optical film two-layer laminate 42 is obtained.

Here, the predetermined angle θ310 is a relative angle of the optical axis 31 of the third optical film with respect to the optical axis 11 of the first optical film in the liquid crystal display device to which the desired optical film 3-layer laminate chip is applied. It is a design value of and is an angle which showed the counterclockwise direction positively from the 1st optical film side.

Although the reference line EF is a straight line and intersects the side CD and the side BC of the optical film two-layer laminated body 40 in FIG. 1 and FIG. 2, the reference line EF is necessarily limited to this in the manufacturing method of this invention. The size of the parallelogram optical film two-layer laminate 40 so that the desired optical film three-layer laminate chip 51 can be most efficiently produced from the optical film three-layer laminate 50 obtained. , The relative angle θ21, the width W3 of the band-shaped third optical film to be used, the dimension of the width and width of the desired optical film three-layer laminate chip 51, and the first optical with respect to the reference line 60. It is appropriately selected according to the angle (θ1) of the optical axis of the film, the angle (θ2) of the optical axis of the second optical film, the angle (θ3) of the optical axis of the third optical film, and the like to intersect the side AD or the side AB. May be a straight line through at least one of vertex A, vertex B, vertex C, and vertex D .

As shown in FIG. 3 and FIG. 4, the obtained first optical film two-layer laminate 41 and the second optical film two-layer laminate 42 are bonded to a strip-shaped third optical film 32. By laminating, a strip-shaped optical film three-layer laminate 52 is obtained. 3 and 4 show an optical film two-layer laminate 40 in which a pair of opposite sides AB and DC as shown in FIG. 1 are parallel to the optical axis 21 of the second optical film. An example of using is shown.

Here, the 1st optical film 2-layer laminated body 41 is laminated | stacked so that the cutting edge E'F 'may be parallel to one edge GH of a strip | belt-shaped 3rd optical film. In addition, the 2nd optical film 2-layer laminated body 42 is laminated | stacked so that the cutting edge E "F" may be parallel to the other edge IJ of the strip | belt-shaped 3rd optical film 32. Moreover, as shown in FIG.

In the manufacturing method of the present invention, as shown in FIG. 1, the parallelogram optical film two-layer laminate 40 is formed at an angle equal to a predetermined angle θ310 with respect to the optical axis 11 of the first optical film. When cutting along the reference line EF that intersects ø1), as shown in FIG. 3, the strip-shaped third optical film 32 has a film having an optical axis 31 parallel to its longitudinal direction. When used, the relative angle θ31 of the optical axis 31 of the strip-shaped third optical film with respect to the optical axis 11 of the first optical film in the strip-shaped optical film three-layer laminate 5 is the above angle. It becomes the same as (1) and becomes equal to the predetermined angle [theta] 310.

In addition, as shown in FIG. 2, the parallelogram optical film two-layer laminate 40 intersects at an angle ø1 equal to the angle (90 ° + θ310) with respect to the optical axis 11 of the first optical film. When cutting along the reference line EF to be used, as shown in FIG. 4, when a film having an optical axis 31 orthogonal to its longitudinal direction is used as the band-shaped third optical film 32, The relative angle θ31 of the optical axis 31 of the band-shaped third optical film with respect to the optical axis 11 of the first optical film in the optical film three-layer laminate 5 of the shape is an angle (ø1-90 °). ) And equal to a predetermined angle [theta] 310.

Here, the relative position of the lamination | stacking of the 1st optical film 2-layer laminated body 41 or the 2nd optical film 2-layer laminated body 42 with respect to the strip | belt-shaped 3rd optical film 32 is obtained. The size, relative angle (θ21), and use of the parallelogram optical film two-layer laminate 40 so that the desired optical film three-layer laminate chip 51 can be most efficiently produced from the layer laminate 50. The width W3 of the strip-shaped third optical film, the horizontal dimension of the desired optical film 3-layer laminate chip 51, and the angle (θ1) of the optical axis of the first optical film with respect to the reference line 60. , The angle θ2 of the optical axis of the second optical film, the angle θ3 of the optical axis of the third optical film, and the like are appropriately selected. In the first optical film two-layer laminate 41 or the second optical film two-layer laminate 42, a portion protruded from the band-shaped third optical film 32 may be present, The part which protruded from the 1st optical film 2-layer laminated body 41 or the 2nd optical film 2-layer laminated body 42 in the 3rd optical film 32 may exist.

In addition, the 1st optical film 2-layer laminated body 41 and the 2nd optical film 2-layer laminated body 42 are normally laminated | stacked on the strip | belt-shaped 3rd optical film 32, without overlapping each other.

This lamination is usually performed by bonding with a transparent adhesive. As a transparent adhesive agent, pressure sensitive adhesives, such as an acrylic pressure sensitive adhesive and a urethane type pressure sensitive adhesive, can be used, It is preferable to apply these to a 2nd optical film or a strip | belt-shaped 3rd optical film previously, and to be a pressure sensitive adhesive layer.

In the strip | belt-shaped optical film 3-layer laminated body 52 obtained in this way, as shown, for example in FIG. 3 and FIG. 4, a pair of opposite sides in the used optical film 2-layer laminated body 40 are shown, for example. One side AB of the first optical film two-layer laminate 41 constituting (AB and DC) and one side CE ″ of the second optical film two-layer laminate 42 are adjacent to each other. One side (AB) of the first optical film two-layer laminate and one side (CE ") of the second optical film two-layer laminate may be laminated at regular intervals from each other, but It is preferable to laminate | stack on the strip | belt-shaped 3rd optical film adjacently without space | interval from each other in terms of the utilization efficiency of a 3rd optical film of a shape.

Next, the strip | belt-shaped 3rd optical film 32 which comprises the obtained strip | belt-shaped optical film 3-layer laminated body 52 was laminated | stacked the 1st optical film 2-layer laminated body 41, or 2nd optical The film two-layer laminated body 42 and the 3rd optical film 30 are cut | disconnected along the shape of the area | region 70 which overlaps each other (FIGS. 3 and 4).

The strip-shaped third optical film 32 does not need to be cut along the shape of the overlapping region 70 precisely and may be roughly followed in practical range.

Thus, the optical film 3-layer laminated body 50 obtained by cutting the strip | belt-shaped optical film 3-layer laminated body 52 is the 1st optical film 10, the 2nd optical film 20, and the 3rd optical film ( 30, the relative angle θ21 of the optical axis 21 of the second optical film with respect to the optical axis 11 of the first optical film becomes a predetermined angle θ210, and the optical axis of the first optical film The optical film 3-layer laminated body 50 is laminated | stacked so that the relative angle (theta) 31 of the optical axis 31 of the 3rd optical film may become predetermined angle (theta) 310. In addition, in the optical film three-layer laminate 50, the first optical film 10 and the second optical film 20 are parallel or orthogonal to the direction of the optical axis 21 of the second optical film on the third optical film. Divided by straight lines AB and CE ″ and having a pair of opposite sides (AD and BF ′ or AD and CF ″) parallel to the optical axis 11 of the first optical film, and also the third optical film It has a pair of opposing sides E'F 'and E "F" parallel or perpendicular to the optical axis 31 of. Accordingly, the optical film three-layer laminate 50 can recognize the direction of the optical axis 21 of the second optical film by a straight line AB and CE ″ that is a straight line dividing the first optical film and the second optical film. It is possible to recognize the direction of the optical axis 11 of the first optical film by a pair of opposite sides (AD and BF 'or AD and CF "), and also a pair of opposite sides (E'F) And E "F"), it is possible to recognize the direction of the optical axis 31 of the third optical film.

The optical film 3-layer laminated body chip 51 can be cut-out from this optical film 3-layer laminated body 50 (FIG. 5).

Cut-out is the first optical film two-layer laminate and the second optical in the direction of the reference line 60 in the desired optical film three-layer laminate chip 51, the dimensions of the horizontal and vertical, or the optical film three-layer laminate. In consideration of the positions of the cutting lines AB and CE ″ for cutting out the film two-layer laminate, the start position of the cutting out and the arrangement of the optical film three-layer laminate chips to be cut out are appropriately selected.

According to the manufacturing method of this invention, an optical film 3-layer laminated body chip can be manufactured by the cut out process to one chip | tip.

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

A strip-shaped linear polarizing film [manufactured by Sumitomo Chemical Co., Ltd., "Sumikaran SH", width 1040 mm, having an absorption axis 11 in parallel with the longitudinal direction, and an acrylic pressure-sensitive adhesive layer (thickness 25 µm) on the back side. 12 was cut at intervals of 895 mm at an angle (ø2 = 125 °) with respect to its longitudinal direction to obtain a parallelogram linear polarizing film 14. The distance L1 between two parallel sides AB and DC at an angle? 2 with respect to the longitudinal direction, that is, the direction of the absorption axis 11, is approximately 733 mm.

This parallelogram linear polarizing film 14 has two strips (AB and DC) parallel in the adhesive layer on its back side along both edges (KL and MN) of the retardation film 22 to form a band-shaped retardation film [ Sumitomo Kagaku Kogyo Co., Ltd., "Sumikalite SEF", width 750 mm, has a ground axis 21 in the direction orthogonal to the longitudinal direction, and has an acrylic pressure-sensitive adhesive layer (thickness 25 μm) on the back side thereof. ) To obtain a strip-shaped optical film two-layer laminate 44 in which a parallelogram-shaped linear polarizing film was laminated on a strip-shaped retardation film (Fig. 12). The strip-shaped optical film two-layer laminate 44 is cut along a cutting line C2 along the shape of the stacked parallelogram linear polarizing film 14 to form a parallelogram having a linear polarizing film and a retardation film laminated thereon. An optical film two-layer laminate 40 was obtained (FIG. 12). In this parallelogram optical film two-layer laminated body 40, the angle (theta) 21 of the slow axis 21 of the retardation film with respect to the absorption axis 11 of a linear polarizing film is 35 degrees.

As shown in FIG. 13, the parallelogram optical film two-layer laminate 40 (ABCD) forms an angle of 72 ° with respect to its absorption axis 11 and CF is 45 mm (BF = 850 mm). , 1E optical film two-layer laminated body (AE 'F'CD) 41 and 2nd optical film two-layer laminated body cut | disconnected along the baseline EF which AE becomes 310 mm (BE = 980 mm). (E "BF") 42 was obtained.

Side AD and side BF "contact each such 1st optical film 2-layer laminated body 41 and 2nd optical film 2-layer laminated body 42 in the adhesive layer of the back surface, respectively, as shown in FIG. And the side AE 'and the side E "B are in a straight line, and the side E'F' follows the one edge GH of the strip | belt-shaped 3rd optical film 32, and the side E" F "is the other edge ( IJ) is laminated on a band-shaped retardation film [Sumitomo Kagaku Kogyo Co., Ltd., "Sumikaran SEF", width 750 mm] (32) to form a strip-shaped optical film three-layer laminate (52). Obtained (FIG. 13).

This strip | belt-shaped optical film three-layer laminated body 52, where the 1st optical film two-layer laminated body 41 or the 2nd optical film two-layer laminated body 42 and the 3rd optical film 32 overlap each other The optical film three-layer laminate 50 was obtained by cutting along the shape of the region E "E'F'CD '(FIG. 14).

50 pieces of optical film 3-layer laminated chips [96 mm x 133 mm, the angle of the absorption axis 11 with respect to the long side direction 60] 051 from such an optical film 3-layer laminated body 50 It can be withdrawn (FIG. 14). In addition, in FIG. 14, the optical film 3-layer laminated chip 51 has shown one part.

The present invention provides a method capable of cutting out the optical film three-layer laminate chip by one cutting out step by omitting the step of taking out the cut out into chips.

Claims (3)

In the first optical film, the second optical film and the third optical film, the relative angle θ21 of the optical axis of the second optical film with respect to the optical axis of the first optical film becomes a predetermined angle θ210, and the first optical film In the manufacturing method of the optical film 3-layer laminated body laminated | stacked so that the relative angle (theta) 31 of the optical axis of a 3rd optical film with respect to the optical axis of may become a predetermined angle (theta) 310, The 1st optical film and the 2nd optical film are laminated | stacked so that the relative angle (theta) 21 of the optical axis of a 2nd optical film with respect to the optical axis of a 1st optical film may become predetermined angle (theta) 210, A parallelogram optical film two-layer laminate having a pair of opposing sides parallel to the optical axis and another pair of opposing sides parallel or orthogonal to the optical axis of the second optical film, The first optical film two-layer laminate and the second optical film two-layer laminate by cutting along a reference line that intersects at an angle θ1 equal to a predetermined angle θ310 or (90 ° + θ310) with respect to the optical axis. To obtain, The obtained 1st optical film 2-layer laminated body and the 2nd optical film 2-layer laminated body were laminated | stacked 1st optical film 2 layers on the strip | belt-shaped 3rd optical film which has an optical axis parallel or orthogonal to its longitudinal direction. Lamination so that the cut edges of the sieve are parallel to one edge of the band-shaped third optical film and the cut edges of the second optical film two-layer laminate are parallel to the other edges of the band-shaped third optical film. To obtain a strip-shaped optical film three-layer laminate, The strip | belt-shaped 3rd optical film which comprises the obtained strip | belt-shaped optical film 3-layer laminated body was laminated | stacked the 1st optical film 2-layer laminated body, or the 2nd optical film 2-layer laminated body, and the 3rd optical film A method for producing an optical film three-layer laminate, characterized by cutting along the shape of the overlapping region. In the 1st optical film, the 2nd optical film, and the 3rd optical film, the relative angle (theta) 21 of the optical axis of the 2nd optical film with respect to the optical axis of a 1st optical film becomes a predetermined angle (θ210), and a 1st optical film In the optical film 3-layer laminated body laminated | stacked so that the relative angle (theta) 31 of the optical axis of the 3rd optical film with respect to the optical axis of may become a predetermined angle (theta) 310, The first optical film and the second optical film are divided along a straight line parallel or perpendicular to the optical axis of the second optical film on the third optical film and have a pair of opposite sides parallel to the optical axis of the first optical film. And have a pair of opposite sides parallel or orthogonal to the optical axis of the third optical film. An optical film three-layer laminate chip is cut out and drawn out from the optical film three-layer laminate according to claim 2, characterized by the above-mentioned.

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