JPH08201624A - 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 laminated polarizing plate. [Structure] A first polarizing plate 3a formed by attaching supports 2a on both sides of a polarizing element 1a and a second polarizing plate 3b formed by attaching supports 2b on both sides of a polarizing element 1b are bonded together. A method for manufacturing a laminated polarizing plate comprising the steps of: cutting the second polarizing plate 3b into an appropriate rectangular shape, rotating the cut chips 90 ° on a plane, and arranging them side by side. This is a method characterized in that it is joined by an appropriate means to form a joined polarizing plate 3b, and the joined polarizing plate 3b and the first polarizing plate 3a are bonded together.

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 first polarizing plate 3a having a support 2a attached to both sides of a polarizing element 1a and a second polarizing plate 3b having a support 2b attached to both sides of a polarizing element 1b are bonded together. A method for manufacturing a laminated polarizing plate comprising the steps of: cutting the second polarizing plate 3b into an appropriate rectangular shape, rotating the cut chips 90 ° on a plane, and arranging them side by side. A method for manufacturing a laminated polarizing plate, which is manufactured by bonding the bonded polarizing plate 3b by an appropriate means and bonding the bonded polarizing plate 3b and the first polarizing plate 3a together. Is.

A first polarizing plate 3a having a width S formed by attaching supports 2a on both sides of the polarizing element 1a and a second polarizing plate having a width S formed by attaching supports 2b on both sides of the polarizing element 1b. 3b is a method for manufacturing a laminated polarizing plate, in which a roll-shaped first polarizing plate 3a and a second polarizing plate 3b having a width S and a light absorption axis located in the longitudinal direction are formed. After cutting the second polarizing plate 3b into a square shape and rotating the cut chips 90 ° on a plane and arranging them side by side, adjacent chips are joined together by an appropriate means and wound into a roll. By turning the second polarizing plate 3b to a width S, the roll-shaped joint polarizing plate 3b in which the light absorption axes of the chips are positioned in parallel
And an adhesive processing step of continuously adhering the jointed polarizing plate 3b and the first polarizing plate 3a, and adhering at least one surface of the laminated polarizing plate formed by the adhering, and the laminated polarizing plate. One or both of the cutting steps for cutting to a predetermined size are performed to produce a laminated polarizing plate in which the light absorption axes of the first polarizing plate 3a and the joining polarizing plate 3b are orthogonal to each other. And a method for manufacturing a laminated polarizing plate.

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. Color polarizing plate D
And a blue color polarizing plate E are laminated, or a bicolor polarizing plate in which a purple color polarizing plate H and a yellow color polarizing plate I are laminated.

Here, the bicolor polarizing plate is a black and white CR.
It is an essential member for the LCS (Liquid Crystal Shutter) system, which is one of the means for colorizing the black and white CRT by installing it in front of the T.

A PVA film having a width of 840 mm is dyed in a predetermined color and then uniaxially stretched to prepare a polarizing element 1a having a width of 500 mm, and a support 2a (for example, a saponified triacetyl cellulose film) is attached on both sides with an adhesive (for example, an adhesive). Polyvinyl alcohol aqueous solution), and a protective film 7 (for example, a polyethylene coextrusion film) is laminated on one or both surfaces of the support 2a to prepare a first polarizing plate 3a. A release film 6 having an adhesive layer 4a (for example, an acrylic adhesive) for attaching the bonded polarizing plate 3b to the lower surface of the sheet is attached (when the protect film 7 is attached to both sides, one protect film 7 is attached). The release film 6 and then release film 6 is attached.) Creating a first polarizer 3a of constant length. The first polarizing plate 3a is wound into a roll shape (see FIGS. 5 and 6). The light absorption axis of the first polarizing plate 3a (illustrated by the arrow in FIG. 5) is the length direction of the first polarizing plate 3a.

In the same manner as described above, a second polarizing plate 3b (having a light absorption axis in the longitudinal direction) having a width of 500 mm and a support 2b attached to both sides of the polarizing element 1b is prepared. The second polarizing plate 3b is provided with a protect film 7 on both supports 2b in order to prevent damage due to the following work (see FIG. 7).

Subsequently, the second polarizing plate 3b is cut every 500 mm in the length direction to obtain square chips, and each chip is rotated by 90 ° on a plane (the light absorption axis of each chip (indicated by an arrow). (Shown) are parallel to each other),
The chips are joined together with an appropriate tape 8 (for example, a commercially available cellophane adhesive tape) to form a joined polarizing plate 3b. This jointed polarizing plate 3b is also wound into a roll shape (see FIG. 8).

The protective film 7 on one surface of the roll-shaped jointed polarizing plate 3b is peeled off, the release film 6 of the roll-shaped first polarizing plate 3a is peeled off, and both are bonded via the adhesive layer 4a. Then, the protect film 7 on one surface of the integrated laminated polarizing plate is peeled off, and a release film 6 with an adhesive layer 5 (for example, a polyester film with a one-side release treatment) is attached (see FIG. 9).

Finally, when the laminated polarizing plate is chip-cut into a predetermined size, a laminated polarizing plate in which the light absorption axis of the polarizing element 1a and the light absorption axis of the polarizing element 1b are orthogonal to each other is 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.

In this embodiment, the adhesive layer 4a formed on the first polarizing plate 3a is laminated with the joining polarizing plate 3b. However, an adhesive layer is formed on the joining polarizing plate 3b, May be laminated.

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. Therefore, in the large-sized state in which the first polarizing plate 3a and the joining polarizing plate 3b are laminated. Stock is possible.

Since the first polarizing plate 3a and the jointed polarizing plate 3b are roll-to-roll bonded to each other continuously, more efficient bonding is 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.

In this embodiment, when the joint polarizing plate 3b 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.

[0029]

As described above, according to the present invention, it is possible to efficiently manufacture a laminated polarizing plate, and thus it is possible to reduce the cost of the product and the time from receiving the order to delivering the product. .

[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 an explanatory diagram of a first polarizing plate according to this example.

FIG. 6 is a structural explanatory view of a first polarizing plate according to the present embodiment.

FIG. 7 is a structural explanatory view of a second polarizing plate according to the present embodiment.

FIG. 8 is an explanatory diagram of a combined polarizing plate according to the present embodiment.

FIG. 9 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 First polarizing plate 3b 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 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 laminated polarizing plate obtained by laminating a first polarizing plate having a support attached on both sides of a polarizing element and a second polarizing plate having a support attached on both sides of the polarizing element. Of the second polarizing plate, the chips are cut into squares as appropriate, the cut chips are rotated by 90 ° on a plane and arranged side by side, and the adjacent chips are joined together by an appropriate means. A method for producing a laminated polarizing plate, which comprises producing a laminated polarizing plate by laminating the laminated polarizing plate with the first polarizing plate. 2. A first polarizing plate of width S formed by attaching supports to both sides of a polarizing element, and a second polarizing plate of width S formed by attaching supports to both sides of the polarizing element. A method for manufacturing a laminated polarizing plate, which comprises forming a roll-shaped first polarizing plate and a second polarizing plate having a width S and having a light absorption axis in the longitudinal direction, and forming a second polarizing plate. Are cut into squares, the cut chips are rotated by 90 ° on a plane and arranged side by side, and then adjacent chips are joined together by an appropriate means and wound into a roll to form the second polarized light. The plate has a width S to form a roll-shaped jointed polarizing plate in which the light absorption axes of the respective chips are positioned in parallel, and the jointed polarizing plate and the first polarizing plate are continuously laminated to each other. An adhesive processing step for applying an adhesive to at least one surface of the laminated polarizing plate to be formed and a predetermined supporting method for the laminated polarizing plate. To produce a laminated polarizing plate in which either one or both of the cutting steps for cutting into two parts are performed so that the light absorption axes of the first polarizing plate and the jointed polarizing plate are orthogonal to each other. Method for manufacturing polarizing plate. 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. 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 as a bicolor polarizing plate.