JPH08201623A - Method for manufacturing laminated polarizing plate - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a method for producing a laminated polarizing plate capable of efficiently producing a thin laminated polarizing plate. [Structure] A support 2a is attached to both surfaces of a first polarizing element 1a with an appropriate adhesive to form a polarizing plate 3a in which one support 2a is easily peeled off, and the polarizing plate 3a is appropriately used. After cutting into a shape and rotating the cut chips by 90 ° on a plane and arranging them side by side, adjacent chips are joined by an appropriate means to form the polarizing plate 3a as a joining polarizing plate 3a. Then, one support 2a which can be easily peeled off from the jointed polarizing plate 3a is peeled off, and subsequently, the support 2b is attached to one surface of the second polarizing element 1b and the one of the above-mentioned one is attached to the other surface. In this method, the bonded polarizing plate 3a from which the support 2a has been peeled off is attached by an appropriate adhesive.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated polarizing plate formed by laminating two polarizing plates, and in particular, a laminated polarizing plate in which a red color polarizing plate and a blue color polarizing plate used as a bicolor polarizing plate are laminated. The present invention relates to a method for producing a laminated polarizing plate in which a plate or a purple color polarizing plate and a yellow color polarizing plate are laminated.

[0002]

2. Description of the Related Art Conventionally, a laminated polarizing plate in which two polarizing plates are bonded together has been proposed. The structure of this laminated polarizing plate is shown in FIG.

A method of manufacturing the laminated polarizing plate according to FIG. 1 (hereinafter referred to as a conventional method) is as follows.

A polarizing element is obtained by uniaxially stretching a polyvinyl alcohol resin film (hereinafter referred to as PVA film) after dyeing.
51a is prepared, the support 52a is adhered on both sides with an adhesive, and the protect film 56 is adhered on the surface of one or both of the supports 52a to prepare the first polarizing plate 53a.
A release film 55 having an adhesive layer 54a formed thereon is attached to the lower surface of the first polarizing plate 53a (when the protect film 56 is attached to both the support 52a, one of the protect films 56 is peeled off to release the release film). 55 is attached), and the first polarizing plate 53a is chip-cut into a predetermined axial angle and size (see FIG. 2).

Similarly, a support 52 is provided on both sides of the polarizing element 51b.
b is attached and the release film 55 (adhesive layer 54b
A second polarizing plate 53b to which is attached is prepared, and the second polarizing plate 53b is also chip-cut into a predetermined axial angle and size (see FIG. 3).

Then, the protective film 56 of the chip of the polarizing plate 53b is peeled off, the release film 55 of the chip of the polarizing plate 53a is peeled off, and both are bonded by an adhesive layer 54a using a bonding machine, Then, the misalignment of the edges at the time of attaching both chips is trimmed by trimming on four sides to complete the product (see FIG. 1).

[0007]

As a result of various studies, the present inventor has confirmed that the above conventional method has the following drawbacks.

When the size change of the finished product occurs, the previous process is affected. That is, when the size of the finished product is changed, it is necessary to change the cut size of the adhesive-processed polarizing plates 53a and 53b in the chip cutting process.

Since the plate-shaped polarizing plates 53a and 53b are bonded together, continuous work is difficult. Trimming cut is essential and the process is complicated.

The present invention provides a method for manufacturing a laminated polarizing plate which solves all the above drawbacks.

[0011]

The gist of the present invention will be described with reference to the accompanying drawings.

A support 2a is attached to both surfaces of the first polarizing element 1a with an appropriate adhesive to form a polarizing plate 3a in which one support 2a is provided so that it can be easily peeled off. After cutting into a shape and rotating the cut chips by 90 ° on a plane and arranging them side by side, adjacent chips are joined by an appropriate means to form the polarizing plate 3a as a joining polarizing plate 3a. Then, one support 2a which can be easily peeled off from the jointed polarizing plate 3a is peeled off, and subsequently, the support 2b is attached to one surface of the second polarizing element 1b and the one of the above-mentioned one is attached to the other surface. The present invention relates to a method for producing a laminated polarizing plate, which is characterized in that the joined polarizing plate 3a from which the support 2a is peeled off is laminated with an appropriate adhesive to produce the laminated polarizing plate.

A support 2a is formed on both sides of the first polarizing element 1a having a width S and having a light absorption axis in the lengthwise direction, with an appropriate adhesive.
A polarizing plate 3a having a width S in which one of the supports 2a can be easily peeled off is formed, the polarizing plate 3a is cut into squares, and each of the cut chips is rotated by 90 ° on a plane. After arranging them in parallel, adjacent chips are joined together by an appropriate means so that the polarizing plate 3a has a width S to form a joined polarizing plate 3a in which the light absorption axes of the chips are located in parallel. One support 2a that can be easily peeled from the combined polarizing plate 3a is peeled off, and then the support 2b is formed on one surface of the second polarizing element 1b having the width S and the light absorption axis located in the longitudinal direction. Adhesion processing step of continuously adhering the splicing polarizing plate 3a from which the one support 2a is peeled off to the other surface, and adhering at least one surface of the laminated polarizing plate formed by this adhering Any of the cutting process to cut the plate to a predetermined size A method for producing a laminated polarizing plate, characterized in that one or both of them are performed to produce a laminated polarizing plate in which the light absorption axes of the first polarizing element 1a and the second polarizing element 1b are orthogonal to each other. It is related.

A liquid crystal body in which a liquid crystal C is arranged between a neutral gray polarizing plate A and a glass plate B, a liquid crystal body in which a liquid crystal G is arranged between a red color polarizing plate D, a blue color polarizing plate E and a glass plate F, A known LCS obtained by laminating a purple color polarizing plate H and a yellow color polarizing plate I in this order.
The red color polarizing plate D and the blue color polarizing plate E used in the (liquid crystal shutter) system.
A method for producing a bicolor polarizing plate in which the above is laminated, or a bicolor polarizing plate in which a purple color polarizing plate H and a yellow color polarizing plate I are laminated, and which is produced by the method for producing a laminated polarizing plate according to claim 2. The obtained laminated polarizing plate is a bicolor polarizing plate or a purple color polarizing plate H in which the red color polarizing plate D and the blue color polarizing plate E are laminated.
And a yellow color polarizing plate I are used for a bicolor polarizing plate.

[0015]

EXAMPLE In this example, a neutral gray color polarizing plate A as shown in FIG. 4, a liquid crystal body in which a liquid crystal C is arranged between glass plates B, a red color polarizing plate D, a blue color polarizing plate E, The red color used in a known LCS (liquid crystal shutter) system, which is formed by laminating a liquid crystal body having a liquid crystal G between glass plates F, a purple color polarizing plate H, and a yellow color polarizing plate I in this order. A laminated polarizing plate in which a color polarizing plate D and a blue color polarizing plate E are laminated or a purple color polarizing plate H and a yellow color light plate I
It is a method for producing a laminated polarizing plate in which and are laminated.

The bicolor polarizing plate is a black and white CRT.
It is an indispensable member for the LCS (Liquid Crystal Shutter) system, which is one of the means for colorizing.

After dyeing a PVA film having a width of 840 mm with a predetermined color, it is uniaxially stretched to have a width of 500 m to prepare a first polarizing element 1a having a light absorption axis located in the length direction, and a support 2a (for example, 2a on both sides is formed. A saponified triacetyl cellulose film) is pasted with an adhesive (for example, an aqueous polyvinyl alcohol solution), and a protective film 6 (for example, a polyethylene coextruded film) is pasted on the surface of one of the two supports 2a. In addition, a polarizing plate 3a is created (see FIG. 5). In this case, one support 2a is provided so that it can be easily peeled off. For example, an unsaponified triacetyl cellulose film is used for the support 2a to be peeled off. The protect film 6 is attached to the support 2a which is not peeled off.

Subsequently, the polarizing plate 3a is moved in the longitudinal direction 500.
Each chip is cut into a square chip to obtain a square chip, and each chip is rotated by 90 ° on a plane (the light absorption axes of the chips (shown by arrows) are parallel to each other). It joins with the tape 7 (for example, commercially available cellophane adhesive tape), and it is set as the joining polarizing plate 3a. This jointed polarizing plate 3a is wound into a roll shape (see FIG. 6).

Subsequently, a second polarizing element 1b having a width of 500 mm and a light absorption axis located in the lengthwise direction is prepared in the same manner as described above, and a support 2b is provided on one surface of the polarizing element 1b and one on the other surface. The support 2a is peeled off and the bonded polarizing plate 3a is continuously bonded with an appropriate adhesive (for example, polyvinyl alcohol aqueous solution) (see FIG. 7), and then the protective film 6 is bonded on the surface of the support 2b. A laminated polarizing plate having a width of 500 mm and having a predetermined length is prepared, and the protective film 6 on one surface of the laminated polarizing plate is peeled off to release film 5 with adhesive layer 4 (for example, polyester film with one-side release treatment). Are pasted together (see FIG. 8).

Finally, when the laminated polarizing plate is chip-cut into a predetermined size, the laminated polarizing plate in a state where the light absorption axis of the first polarizing element 1a and the light absorption axis of the second polarizing element 1b are orthogonal to each other is obtained. Will be obtained.

This laminated polarizing plate is a bicolor polarizing plate in which a red color polarizing plate D and a blue color polarizing plate E in an LCS system are laminated, or a purple color polarizing plate H and a yellow color polarizing plate I are laminated. Used for bicolor polarizing plate.

The structure of this laminated polarizing plate is as shown in FIG.

Since the present embodiment has been described above, the size change of the finished product does not affect the previous process, so that it is possible to stock the two polarizing elements 1a and 1b in a large format.

Since the polarizing element 1a and the polarizing element 1b are continuously bonded, the more efficient bonding becomes possible.

Since the trimming process as in the conventional method is unnecessary, the manufacturing efficiency is improved accordingly. That is, in the conventional method, a trimming cut is an essential step in order to prepare the finished product, that is, to eliminate the deviation (step) in the width direction of the two polarizing plates. Since the chip is cut just before it is obtained to obtain a finished product, this chip cut substantially functions as a trimming cut, and it is not necessary to independently perform the trimming cut as in the conventional method, and the manufacturing efficiency is improved.

Compared with the product according to the conventional method, the adhesive layer and the support are not present, so that the product can be made thinner.

In this embodiment, when the joint polarizing plate 3a is formed, the light absorption axis of the polarizing element 1a and the light absorption axis of the polarizing element 1b are not cut by cutting the parallelogram instead of the square. It is also possible to manufacture a laminated polarizing plate in which the layers intersect at a predetermined angle.

[0028]

As described above, the present invention makes it possible to efficiently manufacture a thin laminated polarizing plate.
It is possible to reduce the cost of products and shorten the time from receiving an order for a product to delivering it.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of a laminated polarizing plate according to a conventional method.

FIG. 2 is a structural explanatory view of a first polarizing plate according to a conventional method.

FIG. 3 is a structural explanatory view of a second polarizing plate according to a conventional method.

FIG. 4 is an explanatory diagram of an LCS system.

FIG. 5 is a structural explanatory view of a bonded polarizing plate according to the present embodiment.

FIG. 6 is an explanatory diagram of a jointed polarizing plate according to this example.

FIG. 7 is an explanatory diagram of a manufacturing process of the laminated polarizing plate according to the present embodiment.

FIG. 8 is a structural explanatory view of a laminated polarizing plate according to this example.

[Explanation of symbols]

 1a, 1b Polarizing element 2a, 2b Support 3a Polarizing plate, joint polarizing plate S Width A Neutral gray color polarizing plate B Glass plate C Liquid crystal D Red color polarizing plate E Blue color polarizing plate F Glass plate G Liquid crystal H Purple Color Color Polarizing Plate I Yellow Color Polarizing Plate

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Kumiko Onda 1-5-5 Minamihonmachi, Joetsu City, Niigata Prefecture Arisawa Manufacturing Co., Ltd. (72) Inventor Kazuo Maeda 1-5-5 Minamihonmachi, Joetsu City, Niigata Prefecture Arisawa Manufacturing Co., Ltd.

Claims (3)

[Claims] 1. A polarizing plate in which a support is attached to both surfaces of a first polarizing element with an appropriate adhesive so that one support can be easily peeled off, and the polarizing plate is cut into a rectangular shape as appropriate. Then
After rotating the cut chips 90 degrees on a plane and arranging them side by side, adjacent chips are joined by an appropriate means to make the polarizing plate a joined polarizing plate. One support which can be easily peeled off from the plate is peeled off, and subsequently, a support is peeled off on one surface of the second polarizing element, and the above-mentioned one support is peeled off on the other surface. A method for manufacturing a laminated polarizing plate, which comprises manufacturing the laminated polarizing plate by laminating the same with an adhesive. 2. A width in which a support is attached to both sides of a first polarizing element having a width S with a light absorption axis in the longitudinal direction with an appropriate adhesive so that one support can be easily peeled off. After forming a polarizing plate of S, cutting the polarizing plate into squares, rotating the cut chips 90 ° on a plane and arranging them side by side, adjoining adjacent chips by an appropriate means. The polarizing plate is set to have a width S to form a jointed polarizing plate in which the light absorption axes of the chips are located in parallel, and subsequently one of the easily peelable supports is peeled off from the jointed polarizing plate. A support is continuously bonded to one surface of the second polarizing element having a width S and the light absorption axis is located in the longitudinal direction, and a bonded polarizing plate obtained by peeling the one support is bonded to the other surface, Adhesion processing step of adhering at least one surface of a laminated polarizing plate formed by laminating, and the lamination Either or both of the cutting steps for cutting the light plate into a predetermined size are performed to produce a laminated polarizing plate in which the light absorption axes of the first polarizing element and the second polarizing element are arranged orthogonal to each other. A method for producing a laminated polarizing plate having the characteristics. 3. A liquid crystal body in which a liquid crystal C is arranged between a neutral gray polarizing plate A and a glass plate B, a liquid crystal G in which a red color polarizing plate D, a blue color polarizing plate E and a glass plate F are arranged. A known LCS in which a body, a purple color polarizing plate H, and a yellow color polarizing plate I are attached in this order.
The red color polarizing plate D and the blue color polarizing plate E used in the (liquid crystal shutter) system.
A method for producing a bicolor polarizing plate in which the above is laminated, or a bicolor polarizing plate in which a purple color polarizing plate H and a yellow color polarizing plate I are laminated, and which is produced by the method for producing a laminated polarizing plate according to claim 2. A bicolor polarizing plate or a purple color polarizing plate H in which the red color polarizing plate D and the blue color polarizing plate E are laminated on each other.
And a yellow color polarizing plate I are used as a bicolor polarizing plate.