JP2020101679A - Polarizing plate laminate and method for laminating polarizing plate - Google Patents

Abstract

To provide a polarizing plate laminate capable of preventing an irregular portion of an irregularly shaped polarizing plate from being damaged, and a method for laminating a polarizing plate.SOLUTION: A polarizing plate laminate 1A is a laminate in which a plurality of irregularly shaped polarizing plates 2 having a shape based on a rectangle are laminated. The polarizing plate 2 has a concave part 3 that is recessed from one side of the rectangle toward the inside of the polarizing plate 2. The polarizing plates 2 that are in contact with each other are laminated so that the region of the one polarizing plate 2 having the concave part 3 and the region of the other polarizing plate 2 having no concave part 3 face each other.SELECTED DRAWING: Figure 1

Description

The present invention relates to a polarizing plate laminate and a method for laminating polarizing plates.

Image display devices such as liquid crystal televisions, organic EL televisions, and smartphones include a polarizing plate as one of optical components. Along with the diversification of the shape of the image display surface, a polarizing plate having a different shape having a concave cutout (concave), which is not a simple polygon, has been introduced (for example, refer to Patent Document 1).

JP, 2018-92147, A

By the way, in the distribution process of polarizing plates, for example, hundreds of polarizing plates may be stacked and transported in a state of being put in a storage container. It is transported in the form of a laminate. At this time, in a deformed polarizing plate, stress is likely to be applied to the portion forming the recess, and there is a concern that the portion may be damaged (cracked, torn, etc.). A means for fitting a cushioning material into the recess for protection of the periphery of the depression is conceivable, but it is necessary to prepare a cushioning material for each shape of the depression, and it is necessary to attach and detach the cushioning material.

Therefore, it is an object of the present invention to provide a polarizing plate laminate capable of preventing a deformed portion of a deformed polarizing plate from being damaged, and a polarizing plate laminating method.

In one embodiment, the present invention is a laminated body in which a plurality of irregularly shaped polarizing plates having a shape based on a rectangle are laminated, and the polarizing plate is a concave portion recessed from one side of the rectangle toward the inside of the polarizing plate. A polarizing plate laminate, in which the polarizing plates that are in contact with each other and are in contact with each other have a concave region in one polarizing plate and a concave region in the other polarizing plate facing each other. To do.

In one embodiment, the present invention is a method for laminating a plurality of irregularly shaped polarizing plates having a shape based on a rectangle, wherein the polarizing plate is recessed from one side of the rectangle toward the inside of the polarizing plate. Provided is a method for laminating polarizing plates, which comprises laminating polarizing plates each having a concave portion and brought into contact with each other so that a region having a concave portion in one polarizing plate and a region having no concave portion in the other polarizing plate face each other.

According to this polarizing plate laminate and the polarizing plate laminating method, the region of the polarizing plate having the concave portion is adapted to face the region of the other polarizing plate laminated thereon having no concave portion, The stress applied to the concave portion from the above is relaxed by the presence of the other polarizing plate. That is, in a deformed polarizing plate, the corner of the deformed portion forming the recess is the most vulnerable portion to external stress. For example, since the corner portion is physically protected by another laminated polarizing plate, it is possible to prevent the odd-shaped portion of the polarizing plate from being damaged.

In another embodiment, the present invention is a laminate in which a plurality of irregularly shaped polarizing plates having a shape based on a rectangle are stacked, and the polarizing plate is recessed from one side of the rectangle toward the inside of the polarizing plate. A plurality of polarizing plate groups each having a concave portion and a plurality of polarizing plates stacked so that the regions having the concave portions face each other. There is provided a polarizing plate laminate in which a region having the polarizing plate and a region having no recess in the other polarizing plate group are laminated so as to face each other.

In addition, the present invention provides, in another embodiment, a stacking method of stacking a plurality of irregularly shaped polarizing plates having a shape based on a rectangle, wherein the polarizing plate is recessed from one side of the rectangle toward the inside of the polarizing plate. A plurality of polarizing plate groups each having a plurality of polarizing plates laminated so that the regions having the concave portions face each other, and the plurality of polarizing plate groups are referred to as a region having the concave portions in one polarizing plate group. Provided is a method for laminating polarizing plates, in which the other polarizing plate group is laminated so as to face a region having no recess.

In addition, the present invention provides, in another embodiment, a stacking method of stacking a plurality of irregularly shaped polarizing plates having a shape based on a rectangle, wherein the polarizing plate is recessed from one side of the rectangle toward the inside of the polarizing plate. A plurality of polarizing plates are laminated so that the regions having the concave portions and the concave portions face each other to form a first polarizing plate group, and another polarizing plate is provided for the first polarizing plate group. The regions of the first polarizing plate group having the concave portions and the regions of the other polarizing plate not having the concave portions are laminated so as to face each other, and the regions having the concave portions face each other with respect to another polarizing plate. There is provided a method for laminating polarizing plates, which comprises laminating polarizing plates on the above to form a second polarizing plate group.

According to this polarizing plate laminate and the method of laminating the polarizing plates, the region having the concave portion of the polarizing plate group is brought into contact with the region having no concave portion of the other polarizing plate group laminated thereon. The stress applied to the concave portion from the outside is relieved by the presence of the other polarizing plate group. That is, in a deformed polarizing plate, the corner of the deformed portion forming the recess is the most vulnerable portion to external stress. For example, since the corner portion is physically protected by the other stacked polarizing plate group, it is possible to prevent the irregular-shaped portion of the polarizing plate from being damaged.

In this polarizing plate laminate, it is preferable that the laminated polarizing plate groups are laminated so that the regions having the recesses are located on the opposite sides of the regions having the rectangular recesses. In such a laminated mode, since the polarizing plates are rectangular, the positions of the four corners of the polarizing plate groups are the same, and the stability of the entire polarizing plate laminate is maintained.

Further, in this polarizing plate laminate, it is preferable that the total number of polarizing plates in which the concave portions are oriented in the same direction accounts for 30% to 70% of the total number of the laminated polarizing plates. According to this, the concave portions are almost uniformly protected as the entire polarizing plate laminate.

The polarizing plate used in the present invention is a polarizing film, a protective film laminated on both sides of the polarizing film, an adhesive layer laminated on one side of the protective film, and a release film laminated on the adhesive layer. And may be provided.

ADVANTAGE OF THE INVENTION According to this invention, the polarizing plate laminated body which can prevent the odd-shaped part of a deformed polarizing plate from being damaged, and the lamination method of a polarizing plate can be provided.

It is a perspective view of the polarizing plate laminated body of 1st Embodiment. It is an exploded perspective view of the polarizing plate laminated body of FIG. It is a perspective view of the polarizing plate laminated body of 2nd Embodiment. It is a disassembled perspective view of the polarizing plate laminated body of FIG. It is a perspective view of the polarizing plate layered product of other embodiments. It is a top view of the polarizing plate layered product of other another embodiment.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same or corresponding parts will be denoted by the same reference numerals, and overlapping description will be omitted.

<First Embodiment>
As shown in FIGS. 1 and 2, the polarizing plate laminate 1A according to the first embodiment of the present invention is formed by laminating a plurality of polarizing plates 2 so that the four corners thereof are aligned with each other. Is. Here, the polarizing plate 2 includes a polarizing film and a protective film laminated on one side or both sides of the polarizing film. A pressure-sensitive adhesive layer and a release film may be further provided on one surface of the polarizing plate. When the pressure-sensitive adhesive layer and the release film are provided, it is preferable that the front and back surfaces are aligned so that these layers have the same direction (for example, the lower direction in the drawing).

Further, the other surface of the polarizing plate may be further provided with an adhesive layer and a surface protective film. When the polarizing plate has adhesive layers on both sides, one adhesive layer is for laminating the polarizing plate to a display panel, etc., and the other adhesive layer is a surface protective layer that is laminated together. Together with the film, it is for the purpose of protecting the polarizing plate surface from scratches during the transportation process. As described above, the polarizing plate is described as a protective film laminated on one side or both sides of the polarizing film, but this protective film may be, for example, a retardation film instead, and a retardation film in addition to the protective film. It may have a film. The polarizing film, the protective film, and the retardation film may be those known in the technical field.

The polarizing plate 2 is a deformed polarizing plate having a shape based on a rectangle, and has a concave portion 3 that is recessed from one side of the rectangle toward the inside of the polarizing plate 2. Here, “based on a rectangle” means that the shape of the polarizing plate is a rectangle, assuming that the recess 3 does not exist. Further, in the present specification, “rectangle” refers to a rectangle and is a concept including a square. Further, the "rectangle" includes those obtained by subjecting the four corners to deformation processing such as rounded corner processing.

The size of the polarizing plate 2 is selected according to the size of the display panel to be used by laminating, but may be, for example, that described in JP-A-2018-159911. Specifically, when the polarizing film included in the polarizing plate 2 has a rectangular shape, the width of the short side is preferably greater than 20 mm and 160 mm or less, and more preferably greater than 25 mm and 130 mm or less. It is more preferably more than 30 mm and 100 mm or less, and particularly preferably more than 30 mm and 80 mm or less. The length of the long side (side in the direction perpendicular to the width direction of the polarizing plate 2) may be, for example, 30 mm or more and 600 mm or less. The width of the concave portion 3 is less than 1.0 times the length of the side where the concave portion 3 is formed (the length of the side assuming that the concave portion 3 is not present), and 0.03. It is preferable that it is at least twice, at least 0.10 times, at least 0.13 times, at least 0.15 times, at least 0.20 times, or at least 0.22 times. More preferably, it may be 0.30 times or more. As shown in FIGS. 1 and 3, the length of the concave portion 3 can be said to be the radius when the concave portion 3 has a semicircular shape, but may be, for example, 3 mm or more and 15 mm or less. Although the concave portion 3 has a semi-circular shape here, it may have a semi-elliptical shape in a plan view depending on the width and the length of the concave portion 3. Notch), or another shape such as a V-shape (triangle notch in plan view).

Each of the plurality of polarizing plates 2 to be laminated has the same shape, and has a concave portion 3 on one side of the reference rectangle. In FIG. 1 and FIG. 2, the shape of the recess 3 is shown as an arc that describes a substantially semicircle. The width of the concave portion 3, that is, the width of the portion opened toward one side of the reference rectangle may be 5 mm or more and 30 mm or less. The depth of the recessed portion 3, that is, the length of a line perpendicularly drawn from one side of the reference rectangle to the deepest portion of the recessed portion 3 may be 1 mm or more and 30 mm or less.

The thickness of the polarizing plate 2 is not particularly limited and can be selected within a range capable of being processed into a sheet-shaped polarizing plate by cutting, and is, for example, about 10 to 150 μm.

In the polarizing plate laminate 1A, the polarizing plates 2 that are in contact with each other are a region A1 (see FIG. 2) having a recess 3 in one polarizing plate 2 and a region A2 having no recess 3 in the other polarizing plate 2. Are laminated so as to face each other. That is, when focusing on the two polarizing plates 2 that are in contact with each other, the stacked polarizing plates 2 are oriented 180° about the axis perpendicular to the main surface of the polarizing plate 2, and the region A1 having the recess 3 is formed. Are stacked so as to be located on the opposite side of the area A1 having the rectangular recesses 3 of each other. In this way, all the polarizing plates 2 are laminated one by one with the direction of the concave portion 3 being different. Here, the “region” is a term used to identify a part of a rectangle, and has a predetermined area along any side of the rectangle and extending from the side to the inside of the polarizing plate. Points to the edge.

The number of laminated polarizing plates 2 in the entire polarizing plate laminate 1A is preferably 100 to 1000. 1 A of polarizing plate laminated bodies are put in a storage container so that it may be pinched|interposed with a cushion material from the up-down direction in the figure, and are conveyed.

In the polarizing plate laminate 1A laminated by this laminating method, the region A1 having the concave portion 3 of the polarizing plate 2 faces the region A2 having no concave portion 3 of the other polarizing plate 2 laminated thereon. Therefore, the stress applied to the recess from the outside is relieved by the presence of the other polarizing plate 2. That is, in a polarizing plate having a deformed shape like the polarizing plate 2, the corners of the deformed portion forming the concave portion 3 are the most vulnerable portions to external stress. According to the polarizing plate laminated body 1A, since the corner portions are physically protected by the other laminated polarizing plates 2, it is possible to prevent the odd-shaped portion of the polarizing plate 2 from being damaged.

Further, in this polarizing plate laminate 1A, the laminated polarizing plates 2 are laminated so that the regions A1 having the concave portions 3 are located on the opposite sides of the regions A1 having the rectangular concave portions 3 to each other. Therefore, the positions of the four corners of all the laminated polarizing plates 2 are the same, and the stability of the entire polarizing plate laminate 1A is maintained.

<Second Embodiment>
As shown in FIGS. 3 and 4, the polarizing plate laminate 1B according to the second embodiment of the present invention is formed by laminating a plurality of polarizing plates 2. The polarizing plate 2 to be laminated is the same as the polarizing plate 2 according to the first embodiment. The polarizing plate laminated body 1B of the second embodiment is different from the polarizing plate laminated body 1A of the first embodiment in that the polarizing plates 2 are not laminated one by one in different directions, but a plurality of polarized light is used. The point is that the polarizing plate groups 4A and 4B composed of the plate 2 are laminated in different directions.

The polarizing plate stack 1B includes two polarizing plate groups 4A and 4B. In each of the polarizing plate groups 4A and 4B, the regions A1 having the concave portions 3 face each other (in FIG. 4, a plurality of polarizing plates 2 are collectively referred to as “A1”. The same applies to the region "A2" that does not have it), that is, it is configured by laminating a plurality of polarizing plates 2 so that the concave portions 3 have the same orientation. The number of the polarizing plates 2 constituting one polarizing plate group is preferably 50 to 200.

The plurality of polarizing plate groups 4A and 4B include a region A1 having a concave portion 3 in one polarizing plate group (first polarizing plate group) 4A and a concave portion 3 in the other polarizing plate group (second polarizing plate group) 4B. Are laminated so as to face the area A2 having no. That is, the stacked polarizing plate groups are oriented so as to be rotated by 180° with respect to the axis perpendicular to the main surface of the polarizing plate group, and the region A1 having the concave portions 3 has the rectangular concave portions 3 of the respective polarizing plate groups. It is stacked so as to be located on the opposite side of the region A1. As a result, in the overall shape of the polarizing plate laminate 1B, the concave portions 3 are observed on one set of the four faces forming the thickness portion of the rectangular parallelepiped, while forming the rectangular parallelepiped. On one surface of the facing surface, the recesses 3 are continuously formed so as to occupy half the thickness of the stacked layer, and on the other surface, the recess 3 has the remaining half of the stacked thickness. A group of recesses are formed in a row so as to occupy the thickness.

In each of the polarizing plate groups 4A and 4B, the number of laminated polarizing plates 2 is preferably 50 to 500. Further, in the polarizing plate laminate 1B, the total number of the polarizing plates 2 having the concave portions 3 in the same direction preferably accounts for 30% to 70% of the total number of the laminated polarizing plates 2. It is more preferable that it occupies 40% to 60%, and it is even more preferable that it occupies 45% to 55%. Within these ranges, the concave portions 3 are likely to be evenly protected in the polarizing plate laminate 1B as a whole.

As a stacking method for forming the polarizing plate stack 1B, for example, there are two methods. The first method is to stack a plurality of polarizing plates 2 with the recesses 3 facing in the same direction to form polarizing plate groups 4A and 4B independently of each other, and finally to form both polarizing plate groups 4A and 4B. It is a method of laminating each other. The second method is a method of first forming one polarizing plate group 4A and then sequentially laminating another polarizing plate 2 thereon to form the next polarizing plate group 4B. At this time, when laminating the another polarizing plate 2 on the polarizing plate group 4A, an area A1 having the concave portion 3 in the polarizing plate group 4A and an area A2 having no concave portion 3 in the other polarizing plate 2 are arranged. Are laminated so as to face each other, and then the polarizing plate 2 is laminated such that another polarizing plate 2 is laminated so that the regions A1 having the concave portions 3 face each other with respect to the other polarizing plate 2. ..

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, in the second embodiment, the polarizing plate laminate 1B that can be regarded as having two polarizing plate groups stacked is shown, but the polarizing plate stack includes three or more polarizing plate groups. Good. For example, as shown in FIG. 5, the polarizing plate laminate of the present invention may be a polarizing plate laminate 1C including four polarizing plate groups 4A, 4B, 4C and 4D.

Also in the polarizing plate laminate 1C shown in FIG. 5, the total number of the polarizing plates 2 in which the concave portions 3 have the same orientation accounts for 30% to 70% of the total number of the laminated polarizing plates 2. Preferably, and more preferably 40% to 60%. It is particularly preferable that the number of the recesses 3 in one direction is substantially the same as that in the other direction. By doing so, the concave portions 3 are protected almost uniformly in the entire polarizing plate laminate 1C.

Further, in the above-mentioned two embodiments, the mode in which the polarizing plate 2 is laminated so that the direction in which the concave portion faces differs by 180° has been described, but the direction in which the concave portion faces may differ by 90°. In particular, when the shape of the polarizing plate is based on a square, as shown in FIG. 6, the polarizing plate laminated body 1D is formed so that the concave portions 3 are oriented in any of four directions in a plan view. Can be configured. Even in this case, since the positions of the four corners of the square are the same in all the polarizing plates, the stability is high. In this aspect, since the concave portions 3 exist in four directions in the plan view of the polarizing plate laminate 1D, the number of polarizing plates having the concave portions 3 in the same direction accounts for 15 to 35% of the total number. Is preferable, and it is more preferable to occupy 20 to 30%.

Further, in the above-described embodiment, the mode in which the shape of the recess is an arc that draws a substantially semicircle (semicircle cutout) is shown, but the shape of the recess may be a U-shape (square cutout). Other shapes such as a letter shape (triangular cutout) may be used.

INDUSTRIAL APPLICABILITY The present invention can be used for transporting a deformed polarizing plate.

1A, 1B, 1C, 1D... Polarizing plate laminate, 2... Polarizing plate, 3... Recessed portion, 4A, 4B, 4C, 4D... Polarizing plate group, A1... Region with recessed portion 3, A2... Region without recessed portion 3 ..

Claims (9)

A laminated body in which a plurality of irregularly shaped polarizing plates having a shape based on a rectangle are laminated,
The polarizing plate has a concave portion recessed from one side of the rectangle toward the inside of the polarizing plate,
A polarizing plate laminate in which the polarizing plates that are in contact with each other are laminated such that a region of the one polarizing plate having the recess and a region of the other polarizing plate having no recess face each other. A laminated body in which a plurality of irregularly shaped polarizing plates having a shape based on a rectangle are laminated,
The polarizing plate has a concave portion recessed from one side of the rectangle toward the inside of the polarizing plate,
A plurality of polarizing plate groups configured by laminating a plurality of the polarizing plates so that the regions having the recesses face each other,
A polarizing plate laminate in which the plurality of polarizing plate groups are laminated so that a region of the one polarizing plate group having the recess and a region of the other polarizing plate group having no recess face each other. The polarizing plate laminate according to claim 2, wherein the stacked polarizing plate groups are stacked such that the regions having the recesses are located on opposite sides of the regions having the rectangular recesses. The polarizing plate laminate according to claim 2 or 3, wherein the total number of polarizing plates in which the recesses are oriented in the same direction accounts for 30% to 70% of the total number of laminated polarizing plates. The polarizing plate, a polarizing film, a protective film laminated on both sides of the polarizing film, a pressure-sensitive adhesive layer laminated on one side of the protective film, a release film laminated on the pressure-sensitive adhesive layer. The polarizing plate laminated body as described in any one of Claims 1-4 provided with. A laminating method for laminating a plurality of irregularly shaped polarizing plates having a shape based on a rectangle,
The polarizing plate has a concave portion recessed from one side of the rectangle toward the inside of the polarizing plate,
A method for laminating polarizing plates, wherein the polarizing plates to be brought into contact are laminated so that a region of the one polarizing plate having the recess and a region of the other polarizing plate having no recess face each other. A laminating method for laminating a plurality of irregularly shaped polarizing plates having a shape based on a rectangle,
The polarizing plate has a concave portion recessed from one side of the rectangle toward the inside of the polarizing plate,
A plurality of polarizing plate groups are formed by laminating a plurality of the polarizing plates so that the regions having the recesses face each other,
A method of laminating a polarizing plate, wherein the plurality of polarizing plate groups are laminated so that a region having the concave portion in one polarizing plate group and a region having the concave portion in the other polarizing plate group face each other. A laminating method for laminating a plurality of irregularly shaped polarizing plates having a shape based on a rectangle,
The polarizing plate has a concave portion recessed from one side of the rectangle toward the inside of the polarizing plate,
A plurality of the polarizing plates are laminated so that the regions having the recesses face each other to form a first polarizing plate group,
Another polarizing plate is laminated on the first polarizing plate group so that a region of the first polarizing plate group having the recess and a region of the other polarizing plate not having the recess face each other. Then
A method of laminating a polarizing plate, wherein the polarizing plate is laminated on another polarizing plate so that the regions having the concave portions face each other, thereby forming a second polarizing plate group. The polarizing plate, a polarizing film, a protective film laminated on both sides of the polarizing film, a pressure-sensitive adhesive layer laminated on one side of the protective film, a release film laminated on the pressure-sensitive adhesive layer. The method for laminating a polarizing plate according to claim 6, further comprising:

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