KR102379797B1 - Method of producing polarizing plate - Google Patents

Abstract

[Problem] To provide a method for manufacturing a polarizing plate capable of realizing multifunctionality and high functionality of an electronic device and having no variation in quality.
[Solutions] In the method for manufacturing a polarizing plate of the present invention, a long polarizing plate having non-polarizing portions arranged at predetermined intervals in the long direction and in the width direction is disposed in the width direction of the long polarizing plate at each predetermined feeding pitch in the long direction. Including cutting sequentially from one side to the other, when cutting the long polarizing plate, the non-polarization part detecting means detects the position of the non-polarization part, and based on the detected position of the non-polarization part, the cutting means Positioning is performed, and the elongate polarizing plate is cut by the cutting means after that, and the single-wafer polarizing plate which has one non-polarization part is obtained one by one.

Description

The manufacturing method of a polarizing plate {METHOD OF PRODUCING POLARIZING PLATE}

The present invention relates to a method for manufacturing a polarizing plate.

DESCRIPTION OF RELATED ART Some image display apparatuses, such as a cellular phone and a notebook personal computer (PC), are equipped with internal electronic components, such as a camera. For the purpose of improving the camera performance of such an image display apparatus, etc., various examination is made|formed (for example, patent documents 1-7). However, with the rapid spread of smart phones and touch panel type information processing devices, further improvement in camera performance and the like is desired. Moreover, in order to respond to the diversification of the shape of an image display apparatus, and high functionalization, the polarizing plate which has polarization performance partially is calculated|required. In order to realize these demands industrially and commercially, it is desired to manufacture an image display device and/or its parts at an acceptable cost, and various considerations remain in order to establish such a technology.

Japanese Patent Laid-Open No. 2011-81315 Japanese Laid-Open Patent Publication No. 2007-241314 Specification of US Patent Application Publication No. 2004/0212555 Korean Patent Publication No. 10-2012-0118205 Korean Patent Publication No. 10-1293210 Japanese Patent Laid-Open No. 2012-137738 Specification of US Patent Application Publication No. 2014/0118826

The present invention has been made in order to solve the above conventional problems, and its main object is to provide a method for manufacturing a polarizing plate capable of realizing multifunctionality and high functionalization of an electronic device and having no variation in quality.

The manufacturing method of the polarizing plate of this invention is a long polarizing plate which has a non-polarization part arrange|positioned at predetermined intervals in the elongate direction and the width direction, for every predetermined long direction feeding pitch, from one side in the width direction of the long polarizing plate to the other. Including sequential cutting toward the direction, when cutting the long polarizing plate, the position of the non-polarizing part is detected, and after positioning based on the detected position of the non-polarizing part, cutting the long polarizing plate, one A single-wafer polarizing plate having a non-polarizing portion of is obtained one by one.

In one embodiment, before performing positioning at the time of cutting of the said elongate polarizing plate, the reference line set in the long polarizing plate is detected, and based on the detection information obtained, it includes determining the direction of cutting.

In one embodiment, the said reference line is detected using two reference-line detection means, the line which connects two reference-line detection means, and the angle formed by the said reference line are adjusted, and the direction of a cutting is determined.

In one embodiment, the said reference line is the width direction short side of the said elongate polarizing plate.

In one embodiment, the line which connects two reference-line detection means and the conveyance direction of a long polarizing plate are parallel.

According to another aspect of this invention, the manufacturing apparatus of a polarizing plate is provided. This manufacturing apparatus is based on the conveyance means which conveys a long polarizing plate at a predetermined|prescribed long direction feeding pitch, the non-polarization part detection means which detects the non-polarization part which the long polarizing plate has, and the detection information from the non-polarization part detection means. It determines a cutting position and includes cutting means for cutting the long polarizing plate.

ADVANTAGE OF THE INVENTION According to this invention, the method of cutting the elongate polarizing plate which has a non-polarization part arrange|positioned at predetermined intervals in the elongate direction and the width direction, and manufacturing the several sheet-wafer polarizing plate which has a non-polarization part is provided. In the said method, when cutting a elongate polarizing plate, a non-polarization part detection means detects the position of the non-polarization part, and a non-polarization part by positioning a cutting means on the basis of the detected position of the non-polarization part as a reference. It is possible to obtain a single-wafer polarizing plate arranged at a desired position with good precision.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic top view explaining an example of the arrangement pattern of the non-polarization part in one Embodiment of this invention.
It is a schematic plan view explaining an example of the arrangement pattern of the non-polarization part in one Embodiment of this invention.
It is a schematic plan view explaining an example of the arrangement pattern of the non-polarization part in one Embodiment of this invention.
Fig.2 (a) - (e) are schematic diagrams explaining the manufacturing method of the polarizing plate by one Embodiment of this invention.
It is a schematic perspective view explaining bonding of the polarizer in the manufacturing method of the polarizer in embodiment of this invention, and a 1st surface protection film.
It is a schematic diagram explaining formation of the non-polarization part in the manufacturing method of the light polarizer in embodiment of this invention.

A. Manufacturing method of polarizing plate (cutting method of long polarizing plate)

The manufacturing method of this invention cuts a long polarizing plate, and cuts out a some single-wafer polarizing plate. Hereinafter, the cutting method of the elongate polarizing plate in the manufacturing method of this invention is demonstrated. In addition, in this specification, "long shape" means an elongated shape that is sufficiently long with respect to the width, for example, it includes an elongated shape with a length of 10 times or more, preferably 20 times or more with respect to the width. .

The elongate polarizing plate may have a non-polarization part arrange|positioned at predetermined intervals in the elongate direction and the width direction. The arrangement pattern of a non-polarization part can be set suitably according to the objective. Typically, when the said non-polarization part cuts to a predetermined size in order to mount a polarizing plate to the image display apparatus of a predetermined size (for example, cut|disconnection to a long direction and/or the width direction, punching), the image display apparatus may be disposed at a position corresponding to the camera unit of the . In one embodiment, a non-polarization part is arrange|positioned at equal intervals substantially also in either the direction of a long picture and the width direction. In addition, "substantially equally spaced in both the long direction and the width direction" means that the intervals in the long direction are equally spaced, and the intervals in the width direction are equally spaced, and the intervals in the long direction and the width direction are It doesn't have to be the same. In another embodiment, a non-polarization part is arrange|positioned at equal intervals substantially in the direction of a long picture, and may be arrange|positioned by the space|interval different in the width direction. When a non-polarization part is arrange|positioned by the space|interval from which a non-polarization part differs in the width direction, all may differ from the space|interval of an adjacent non-polarization part, and only one part (space|interval of a specific adjacent non-polarization part) may differ.

FIG. 1A is a schematic plan view illustrating an example of an arrangement pattern of a non-polarization part in a long polarizing plate, FIG. 1B is a schematic plan view illustrating another example of an arrangement pattern of a non-polarization part, and FIG. 1C is a plan view of the non-polarization part. It is a schematic plan view explaining another example of an arrangement pattern. In one embodiment, as for the non-polarization part 10, as shown to FIG. 1A, the straight line which connects the non-polarization part adjacent in a long direction is substantially parallel with respect to a long direction, and adjacent in the width direction. It is arrange|positioned so that the straight line which connects a non-polarization part may be substantially parallel with respect to the width direction. In another embodiment, as for the non-polarization part 10, as shown to FIG. 1B, the straight line which connects the non-polarization part adjacent in a long direction is substantially parallel with respect to a long direction, And the non-polarization adjacent in the width direction. A straight line connecting the light portions is arranged so as to have a predetermined angle θ _W with respect to the width direction. In another embodiment, as for the non-polarization part 10, as shown in FIG. 1C, the straight line which connects adjacent non-polarization parts in a long direction has a predetermined angle θ _L with respect to the long direction, and in the width direction It is arrange|positioned so that the straight line which connects adjacent non-polarization parts in this may have predetermined angle (theta) _W with respect to the width direction. θ _L and/or θ _W is preferably greater than 0° and less than or equal to ±10°. Here, "±" means including both clockwise and counterclockwise directions with respect to the reference direction (long direction or width direction). The embodiment shown in Figs. 1B and 1C has the following advantages: Depending on the image display device, the absorption axis of the polarizing plate is shifted at most by 10° with respect to the long side or short side of the device to improve display characteristics. There are times when it is required to do. As will be described later, the absorption axis of the polarizing plate is expressed in the long direction or the width direction, so if the configuration is as described above, in such a case, the absorption axis direction of the cut single-leaf polarizing plate 110 can be precisely controlled to a desired angle and , it is possible to remarkably suppress the deviation in the absorption axis direction for each single-wafer polarizing plate 110 . In addition, it cannot be overemphasized that the arrangement pattern of a non-polarization part is not limited to the example of illustration. For example, in the non-polarization part, a straight line connecting adjacent non-polarization parts in the long direction has a predetermined angle θ _L with respect to the long direction, and a straight line connecting adjacent non-polarization parts in the width direction is in the width direction. It may be arranged so as to be substantially parallel to each other. Moreover, a some area|region may be prescribed|regulated in the long direction of a long picture-like polarizing plate, and (theta) _L and/or (theta) _W may be set for each area|region.

As for the planar view shape of the non-polarization part, any suitable shape may be adopted according to the purpose. For example, as long as the planar shape of a non-polarization part does not adversely affect the camera performance of the image display apparatus in which a polarizing plate is used, any suitable shape may be employ|adopted. Although the non-polarization part of an illustration example is circular, you may form, for example in an ellipse, a square, a quadrangle, a rhomboid, etc.

The transmittance|permeability (For example, the transmittance|permeability measured with the light of wavelength 550nm in 23 degreeC) becomes like this. Preferably it is 50 % or more, More preferably, it is 60 % or more, More preferably, it is 75 % or more. and particularly preferably 90% or more. If it is such a transmittance|permeability, when a polarizing plate is arrange|positioned so that a non-polarization part may correspond to the camera part of an image display apparatus, the bad influence on the imaging|photography performance of a camera can be prevented, for example.

The non-polarization part may have any suitable shape. In one embodiment, a non-polarization part is the discoloration part by which light polarizer decolorized partially. The discolored portion is formed by, for example, laser irradiation or chemical treatment. In another embodiment, a non-polarization part is a through-hole. The through hole is formed, for example, by mechanical punching (eg, punching, Thomson blade punching, plotter, water jet) or removal of a predetermined portion (eg, laser ablation or chemical dissolution).

It is a schematic diagram explaining an example of cutting of the elongate polarizing plate in the manufacturing method of the polarizing plate by one Embodiment of this invention. In the manufacturing method of this invention, the elongate polarizing plate 100 which has the non-polarization part 10 arrange|positioned at predetermined intervals in the elongate direction and the width direction is set at a predetermined elongate direction feed pitch (hereinafter, simply referred to as a feed pitch). It includes cutting sequentially from one side of the width direction of the long picture-shaped polarizing plate 100 toward the other every time. When cutting the elongate polarizing plate 100, the elongate polarizing plate 100 conveyed at a predetermined feed pitch is stopped (FIG. 2(a)), and the non-polarizing part detecting means 200 determines the position of the non-polarizing part 10. Detected (FIG. 2(b)), positioning of the cutting means 300 is performed on the basis of the detected position of the non-polarization part 10 (FIG. 2(c)), and then to the cutting means 300 The elongate polarizing plate 100 is cut out by this, and the single-wafer polarizing plate 110 which has one non-polarization part 10 is obtained one by one.

Therefore, the manufacturing apparatus of the polarizing plate used for the manufacturing method of the polarizing plate of this invention (cutting apparatus of an elongate polarizing plate) is a conveying means which conveys a long polarizing plate at a predetermined|prescribed long direction feeding pitch, and a non-polarizing part which a long polarizing plate has. The non-polarization part detection means to detect, and the cutting means which determines a cutting position based on the detection information from the non-polarization part detection means as a reference|standard, and cuts the elongate polarizing plate are included. Preferably, the said cutting means moves toward the other from the one of the width direction of a long picture-shaped polarizing plate, and a cutting position is determined on the basis of the position of the detected non-polarization part as a reference.

The cutting means may have any suitable form. In one embodiment, a cutting edge (for example, a Thompson blade, a corrosive blade) is used as said cutting means. The shape of the cutting edge (that is, the shape of the single-leaf polarizing plate obtained by cutting) may be any suitable shape. For example, a rectangular shape, a square shape, a polygonal shape, a circular shape, an oval shape, etc. are mentioned. Preferably, it has a rectangular shape.

The cutting means may be configured to be movable in a long direction and a width direction. In one embodiment, a predetermined length is movable to a long direction, and a cutting means is movable over the whole width direction. In addition, the cutting means may be configured to be rotatable around a predetermined point so as to adjust the cutting direction.

Any suitable detection means is used as said non-polarization part detection means as long as a non-polarization part and areas other than a non-polarization part can be discriminated. As a non-polarization part detection means, cameras, such as sensors, such as a transmitted light detection sensor and a reflected light detection sensor, a transmitted light imaging type camera, and a reflected light imaging type camera, etc. are mentioned, for example.

The non-polarization part detecting means may be configured to be movable in a long direction and a width direction. In one embodiment, the non-polarization part detection means is movable by predetermined length in the direction of a long picture, and is movable over the whole area of the width direction.

In the manufacturing method of this invention, as shown to Fig.2 (a), the non-polarization part 10 is made to enter in the area|region where the long polarizing plate is cut first, and conveyance of the elongate polarizing plate 100 is stopped. . Then, as shown to FIG.2(b), the non-polarization part detection means 200 detects the position of the non-polarization part 10. As shown in FIG.

The non-polarization part detection means 200 operates to detect one non-polarization part 10 typically within a predetermined area|region. In one embodiment, the non-polarization part detecting means 200 moves in the width direction by a preset distance to the area where the non-polarization part 10 used as the detection target exists, and thereafter, the non-polarization part ( 10) operates in two dimensions to detect . After the non-polarization part detection means 200 detects the non-polarization part 10, it sends the information (for example, coordinate information) to a cutting means. The said operation|movement is repeated and the position of the non-polarization part arranged in the width direction is detected one by one.

Next, as shown in Fig. 2(c), on the basis of the detected position of the non-polarization unit 10, that is, based on the detection information from the non-polarization unit detection unit 200, the position of the cutting unit 300 is determined. do. At this time, the position of the cutting means 300 is determined so that the position of the non-polarization part in a single-wafer polarizing plate may become a desired position. In one embodiment, positioning of the cutting means 300 is based on the position of the detected non-polarization part 10, The position of the specific point in the single-wafer polarizing plate 110 obtained by cutting, and a single-wafer polarizing plate (110) may be implemented by controlling the direction of the shape in a plan view (ie, the angle with respect to the long direction and/or the width direction). As the specific point in the single-wafer polarizing plate 110, any suitable point can be selected, for example, the center of gravity, the vertex, and one point of displacement of the planar view of the single-wafer polarizing plate 110 are mentioned. can In one embodiment, using a rectangular cutting edge as a cutting means, the distance between the predetermined vertex in the planar view shape of a non-polarization part and a cutting blade, and the straight line which connects a non-polarization part and the vertex, and a long picture Positioning of the cutting means is performed by controlling the angle of the short side in the width direction of the upper polarizing plate.

In one embodiment, before positioning of the cutting means 300 (more preferably, before the non-polarization part detection means 200 detects the non-polarization part 10), the cutting means 300 is horizontally rotate to In this way, the direction of cutting can be adjusted appropriately, the single-wafer polarizing plate 110 can be cut out, and the absorption axis direction of the single-wafered polarizing plate 110 obtained by cutting can be made into a desired angle. For example, as shown in FIGS. 1B and 1C , when a straight line connecting adjacent non-polarization portions in the width direction is arranged to have a predetermined angle θ _W with respect to the width direction, according to the angle θ _W , cutting means (300) is rotated in the horizontal direction to adjust the direction of the cutting.

Preferably, the direction in the horizontal direction of the cutting means 300 (ie, the direction of cutting) is based on the reference line set in the long polarizing plate 100 , the reference line and a predetermined side of the cutting means 300 . (For example, in the case of a rectangular cutting edge, the short side or long side of the cutting edge) is determined by adjusting the angle. In this way, even when the elongate polarizing plate 100 meanders and is conveyed, the direction of a cutting is controllable with high precision. Moreover, even when a non-polarization part is circular, by adjusting the direction of cutting on the basis of a reference line, instead of a non-polarization part as a reference, the direction of cutting is controllable with high precision. In one embodiment, the predetermined side A of a rectangular cutting edge becomes parallel to the straight line which connects the non-polarization part adjacent in the width direction, and the side B orthogonal to the side A is the non-polarization part adjacent in the width direction. The direction of the cutting means 300 is determined so as to be orthogonal to the straight line connecting the . As for the reference line set in the elongate polarizing plate 100, the width direction short side of the elongate polarizing plate 100, the line prescribed|regulated by the absorption axis of the elongate polarizing plate 100, etc. are mentioned, for example. In FIG.2(b), the example which makes the width direction short side of the elongate polarizing plate 100 into a reference line is shown. In one embodiment, the reference line (more specifically, the direction of the reference line) is detected by the reference line detecting means 400, and based on the obtained detection information, the direction in the horizontal direction of the cutting means 300 is is decided The reference line detecting means 400 may be integrated with the cutting means 300 or may be configured separately from the cutting means 300 .

Preferably, two baseline detection means 400 are used. By using the two reference line detecting means 400, the direction of the reference line can be accurately detected. In one embodiment, the direction in the horizontal direction of the cutting means 300 is determined by adjusting the angle which the line which connects two reference-line detection means 400 and the said reference|standard line makes. For example, using a rectangular cutting edge, by installing the reference line detecting means 400 so that the line connecting the two reference line detecting means 400 and the long direction (carriage direction) of the long polarizing plate are parallel to each other, the rectangular cutting edge It becomes possible to adjust the horizontal direction (eg, the angle between the short side of the rectangular cutting edge and the reference line).

After positioning the cutting means 300, the cutting means 300 is moved upward or downward toward the elongate polarizing plate 100, and the elongate polarizing plate 100 is punched and cut, and a sheet A polarizing plate 110 is obtained.

As described above, one sheet of single-wafer polarizing plate 110 is obtained. In this invention, the detection of a non-polarization part and cutting of a long picture-like polarizing plate are repeated in the width direction, and a some single-wafer polarizing plate is obtained in the width direction. When cutting the elongate polarizing plate 100 sequentially in the width direction, the non-polarization part detection means 200 and the cutting means 300 are moved toward the other from the one of the width direction of the elongate polarizing plate 100 to the other, The detection of the light part 10 and the cutting of the long polarizing plate 100 are performed (FIG. 2(d)). Moreover, after the non-polarization part detection means 200 detects the x-th non-polarization part 10 from the width direction edge part of the elongate polarizing plate 100, the next non-polarization part 10 (that is, from the said width direction edge part) The timing to operate in order to detect the x+1th non-polarization part) may be before or after the cutting means 300 cuts the x-th non-polarization part 10, and also the x-th non-polarization part 10 ) may coincide with the foundation of In one embodiment, before the non-polarization part detection means 200 detects the non-polarization part 10 first in the width direction, rotate the cutting means 300 in the horizontal direction to adjust the direction of cutting, In a state in which a direction is constant, the detection of the non-polarization part 10 and cutting of the elongate polarizing plate 100 are performed repeatedly in the width direction.

In a line in the width direction, after the cutting of the long polarizing plate 100 is completed, as shown in FIG. With respect to one line, the detection of a non-polarization part and cutting of the elongate polarizing plate 100 are performed. A plurality of sheets of single-leaf polarizing plate from the elongate polarizing plate 100 by repeating this for a predetermined number of times by making one cycle of detection and cutting operation in a line in the width direction, and conveyance for one pitch of the long polarizing plate 100 after the operation. (110) can be obtained. The direction of cutting may be the same between cycles, and may differ for every cycle. Preferably, the direction of the cutting is adjusted by the method from cycle to cycle. If the direction of cutting is adjusted for every cycle, even when the elongate polarizing plate 100 is meandering and conveying, the direction of cutting can be controlled with high precision. A feed pitch can be set according to the space|interval in the long direction of the non-polarization part 10. For example, when the arrangement|sequence of the non-polarization part in a long picture direction is parallel to a long picture direction, it is preferable that a feed pitch is the same length as the space|interval in the long direction of the non-polarization part 10.

According to the present invention, when cutting the elongate polarizing plate as described above, the non-polarization part detecting means detects the position of the non-polarization part, and positioning of the cutting means is performed based on the detected position of the non-polarization part as a reference, It is possible to obtain a single-wafer polarizing plate in which the non-polarizing portion is precisely arranged at a desired position. Moreover, the positional deviation of the non-polarization part in the single-wafer polarizing plate obtained by multiple sheets can be made very small.

B. Manufacturing method of long picture polarizer having non-polarization part

The said elongate polarizing plate contains the elongate polarizer which has a non-polarization part at least. Hereinafter, the manufacturing method of the elongate light polarizer which has a non-polarization part is demonstrated. The cutting method of the elongate polarizing plate demonstrated in A section is, for example, the cutting method of the elongate polarizing plate containing the long picture polarizer demonstrated in this section.

B-1. polarizer

A polarizer is typically comprised from the resin film containing a dichroic substance. As a dichroic substance, an iodine, an organic dye, etc. are mentioned, for example. These can be used individually or in combination of 2 or more types. Preferably iodine is used.

Any suitable resin may be used as the resin for forming the resin film. Preferably, a polyvinyl alcohol-type resin is used. As polyvinyl alcohol-type resin, polyvinyl alcohol and an ethylene- vinyl alcohol copolymer are mentioned, for example. Polyvinyl alcohol is obtained by saponifying polyvinyl acetate. The ethylene-vinyl alcohol copolymer is obtained by saponifying the ethylene-vinyl acetate copolymer.

A polarizer (except a non-polarization part), Preferably it shows absorption dichroism at any wavelength of wavelength 380nm - 780nm. The single-piece transmittance (Ts) of the polarizer (excluding the non-polarization portion) is preferably 39% or more, more preferably 39.5% or more, still more preferably 40% or more, particularly preferably 40.5% or more. am. In addition, the theoretical upper limit of single transmittance is 50 %, and a practical upper limit is 46 %. In addition, the single transmittance (Ts) is a Y value measured with a 2 degree field of view (C light source) of JIS Z8701 and corrected for visibility, for example, it can be measured using a microscopic spectroscopy system (Lambda Vision, LVmicro). there is. The degree of polarization of the polarizer (excluding the non-polarization portion) is preferably 99.9% or more, more preferably 99.93% or more, and still more preferably 99.95% or more.

The thickness of the polarizer can be set to any appropriate value. The thickness is preferably 30 µm or less, more preferably 25 µm or less, still more preferably 20 µm or less, particularly preferably 10 µm or less. On the other hand, the thickness is preferably 0.5 μm or more, more preferably 1 μm or more.

The absorption axis of the polarizer may be set in any suitable direction depending on the purpose. The direction of the absorption axis may be, for example, a long direction or a width direction. The polarizer which has an absorption axis in a long direction has the advantage that it is excellent in manufacturing efficiency, for example. The polarizer which has an absorption axis in the width direction has the advantage that it can laminate|stack by roll-to-roll and the retardation film which has a slow axis in a long direction, for example. In one embodiment, the absorption axis is substantially parallel to the direction of a long picture or the width direction, and the width direction both ends of a polarizer are slit-processed parallel to the direction of a long picture. According to such a structure, it can cut on the basis of the short side of a polarizer, has a non-polarization part in a desired position, and can manufacture easily the some polarizer which has an absorption axis in an appropriate direction. In addition, the absorption axis of a polarizer can respond to the extending|stretching direction in the extending|stretching process mentioned later.

A polarizer is typically obtained by performing various processes, such as a swelling process, an extending|stretching process, the dyeing process by the said dichroic substance, a crosslinking process, a washing process, a drying process, to the said resin film. When performing various processes, the resin layer formed on the base material may be sufficient as a resin film. Formation of the said non-polarization part can be performed also in the middle of the manufacturing process of a polarizer.

B-2. Formation of non-polarization part

Preferably, the non-polarization part is a discoloration part. According to this configuration, compared to the case in which the through hole is formed mechanically (for example, by mechanical extraction using a Thompson blade punch, a floater, a water jet, etc.), cracks and delamination (delamination) , problems in quality, such as pull-out, are avoided. A discoloration part is preferably formed by making a basic solution contact the desired position of a polarizer (resin film containing a dichroic substance). The non-polarization part formed by such a method can become a low-concentration part whose content of a dichroic substance is lower than other parts (non-contact part). Since content of a dichroic substance itself is low in a low concentration part, compared with the case where the decolorization part is formed by decomposing|disassembling a dichroic substance with a laser beam etc., transparency of a non-polarization part is maintained favorably.

Content of the dichroic substance in the said low concentration part becomes like this. Preferably it is 1.0 weight% or less, More preferably, it is 0.5 weight% or less, More preferably, it is 0.2 weight% or less. The lower limit of content of a dichroic substance in a low concentration part is below a detection limit normally. The difference between content of the dichroic substance in the said other site|part and content of the dichroic substance in a low concentration part becomes like this. Preferably it is 0.5 weight% or more, More preferably, it is 1 weight% or more. When using an iodine as a dichroic substance, iodine content is calculated|required from the X-ray intensity measured by fluorescence X-ray analysis, for example with the analytical curve previously created using the standard sample.

As the basic compound contained in the basic solution, any suitable compound may be used. Examples of the basic compound include hydroxides of alkali metals such as sodium hydroxide, potassium hydroxide and lithium hydroxide, hydroxides of alkaline earth metals such as calcium hydroxide, inorganic alkali metal salts such as sodium carbonate, organic alkali metal salts such as sodium acetate, and aqueous ammonia. can Among these, hydroxides of alkali metals and/or alkaline earth metals are preferably used, and sodium hydroxide, potassium hydroxide and lithium hydroxide are more preferably used. It is possible to efficiently ionize the dichroic material, and it is possible to form a discolored part more conveniently. These basic compounds may be used independently and may be used in combination of 2 or more type.

As a solvent of a basic solution, water and alcohol are used preferably. The concentration of the basic solution is, for example, 0.01 N to 5 N, preferably 0.05 N to 3 N, and more preferably 0.1 N to 2.5 N. The liquid temperature of the basic solution is, for example, 20°C to 50°C. The contact time of the basic solution may be set according to the thickness of the polarizer and the type or concentration of the basic compound contained in the basic solution. The contact time is, for example, 5 seconds to 30 minutes, and preferably 5 seconds to 5 minutes.

As a method of contacting the basic solution, any suitable method may be employed. For example, the method of dripping, coating, and spraying basic solution with respect to light polarizer, and the method of immersing light polarizer in basic solution are mentioned. In the case of contact of a basic solution, you may protect a polarizer with arbitrary appropriate protective materials so that a basic solution may not contact other than a desired site|part. As such a protective material, a protective film and a surface protective film are used, for example. A protective film can be used as it is as a protective film of a polarizer. A surface protection film is temporarily used at the time of manufacture of a polarizer. Since a surface protection film is removed from a polarizer at arbitrary appropriate timings, it is typically bonded together to a polarizer via an adhesive layer. As another specific example of a protective material, a photoresist etc. are mentioned. Moreover, the base material used in the manufacturing process of the said polarizer can also be used as a protective material.

Preferably, at the time of contact of a basic solution, the polarizer surface is coat|covered with the surface protection film so that the at least one part may be exposed. The polarizing plate which has the arrangement pattern of the non-polarization part like an example of illustration bonds the surface protection film in which the small circular through-hole corresponding to the desired non-polarization part size was formed in the position corresponding to the said arrangement pattern on one side of a polarizer, and a polarizing film laminated body It is prepared by preparing and contacting it with a basic solution. In that case, it is preferable that the other side (the side where the surface protection film in which the through-hole was formed is not arrange|positioned) of the polarizer is also protected. It is preferable that bonding of a protective film or a surface protection film is performed with a roll-to-roll as shown in FIG. In this specification, a "roll-to-roll" means making a mutual elongate direction coincide, and laminating|stacking, conveying a roll-shaped film.

It is a partial cross-sectional view of the polarizing film laminated body by one Embodiment of this invention. The polarizing film laminate 101 is a polarizer 20 and a first surface protection film 30 disposed on one side (upper surface side in the illustrated example) of the polarizer 20, and the other side of the polarizer 20 ( In the example of illustration, the protective film 40 and the 2nd surface protection film 50 arrange|positioned on the lower surface side are provided. The polarizing film laminate 101 has the exposed parts 21, 21... by which the polarizer 20 was exposed in the one surface side (in the example of illustration, the upper surface side). The exposed portion 21 is formed by forming the through hole 31 in the first surface protection film 30 .

Examples of the material for forming the surface protection film include ester-based resins such as polyethylene terephthalate-based resins, cycloolefin-based resins such as norbornene-based resins, olefin-based resins such as polyethylene and polypropylene, polyamide-based resins, and polycarbonate-based resins Resin, these copolymer resins, etc. are mentioned. Preferably, it is an ester-type resin (especially polyethylene terephthalate-type resin). This is because the elastic modulus is sufficiently high and, for example, deformation of the through hole does not easily occur even if tension is applied at the time of conveyance and/or bonding. The thickness of a surface protection film is typically 20 micrometers - 250 micrometers, Preferably they are 30 micrometers - 150 micrometers.

A 1st surface protection film has the through-hole arrange|positioned in a predetermined pattern. The position of the through hole corresponds to the position where the non-polarization part is formed. The shape of a through hole corresponds to the shape of a desired non-polarization part. The through hole is formed, for example, by mechanical punching (eg punching, Thomson blade punching, plotter, water jet) or removal of a predetermined portion of the film (eg laser ablation or chemical dissolution).

A surface protection film peels and removes at arbitrary appropriate timings after contact of a basic solution, for example.

Examples of the material for forming the protective film include cellulose-based resins such as diacetyl cellulose and triacetyl cellulose, (meth)acrylic resins, cycloolefin-based resins, olefin-based resins such as polypropylene, and polyethylene terephthalate-based resins. ester-based resins, polyamide-based resins, polycarbonate-based resins, and copolymer resins thereof. The thickness of a protective film becomes like this. Preferably they are 10 micrometers - 100 micrometers.

The surface on which the polarizer of the protective film is not laminated may be subjected to a treatment for the purpose of a hard coat layer, antireflection treatment, diffusion or antiglare as a surface treatment layer. A protective film is typically bonded to a polarizer through an adhesive bond layer.

In one embodiment, the said basic solution is removed from a light polarizer by arbitrary appropriate means after contacting with a light polarizer. According to such embodiment, the transmittance|permeability fall of the non-polarization part accompanying use of a polarizer can be prevented more reliably, for example. As a specific example of the removal method of a basic solution, washing|cleaning, wiping removal by a waste cloth etc., suction removal, natural drying, heat drying, ventilation drying, reduced pressure drying, etc. are mentioned. Preferably, the basic solution is washed. As a washing|cleaning liquid used for washing|cleaning, water (pure water), alcohol, such as methanol and ethanol, these mixed solvent, etc. are mentioned, for example. Preferably, water is used. The number of times of washing|cleaning is not specifically limited, You may implement in multiple times. When removing a basic solution by drying, the drying temperature is 20 degreeC - 100 degreeC, for example.

Preferably, the alkali metal and/or alkaline-earth metal contained in the resin film are reduced in the contact part to which the basic solution was contacted after contact with the said basic solution. By reducing an alkali metal and/or an alkaline-earth metal, the non-polarization part excellent in dimensional stability can be obtained. Specifically, also in a humidified environment, the shape of the non-polarization part formed by contact with a basic solution can be maintained as it is.

By contacting the basic solution, hydroxides of alkali metals and/or alkaline earth metals may remain in the contact portion. Moreover, by making a basic solution contact, the metal salt (for example, borate) of an alkali metal and/or alkaline-earth metal can be produced|generated in a contact part. These can generate hydroxide ions, and the generated hydroxide ions can act (decompose/reduce) on a dichroic substance (eg, an iodine complex) existing around the contact portion, thereby broadening the non-polarization region. Therefore, by reducing alkali metal and/or alkaline-earth metal salt, it is suppressed that a non-polarization area|region spreads over time, and it is thought that a desired non-polarization part shape can be maintained.

It is preferable that content of the said non-polarization part is 3.6 weight% or less of an alkali metal and/or alkaline-earth metal, More preferably, it is 2.5 weight% or less, More preferably, it is 1.0 weight% or less, Especially preferably, it is 0.5 weight%. is below. Content of an alkali metal and/or alkaline-earth metal can be calculated|required with the analytical curve previously prepared using the standard sample from the X-ray intensity measured by fluorescence X-ray analysis, for example.

As a method for the said reduction, Preferably, the method of making an acidic solution contact the contact part with a basic solution is used. According to such a method, an alkali metal and/or alkaline-earth metal can be efficiently transferred to an acidic solution, and the content can be reduced. Contact with an acidic solution may be performed after removal of the said basic solution, and may be performed without removing a basic solution.

As an acidic compound contained in the said acidic solution, arbitrary suitable acidic compounds can be used. Examples of the acidic compound include inorganic acids such as hydrochloric acid, sulfuric acid, nitric acid and hydrogen fluoride, and organic acids such as formic acid, oxalic acid, citric acid, acetic acid and benzoic acid. Among these, the acidic compound contained in the acidic solution is preferably an inorganic acid, and more preferably hydrochloric acid, sulfuric acid or nitric acid. These acidic compounds may be used independently and may be used in combination of 2 or more type.

As a solvent of an acidic solution, water and alcohol are used preferably. The concentration of the acidic solution is, for example, 0.01 N to 5 N, preferably 0.05 N to 3 N, and more preferably 0.1 N to 2.5 N. The liquid temperature of the acidic solution is, for example, 20°C to 50°C. The contact time of an acidic solution is 5 second - 5 minutes, for example. In addition, as the method of contacting the acidic solution, the same method as the method of contacting the basic solution may be employed. Moreover, an acidic solution can be removed from a polarizer. As the method for removing the acidic solution, the same method as the method for removing the basic solution may be employed.

B-3. Cutting of the polarizer

The elongate polarizing plate (for example, the elongate polarizing plate comprised by arranging a protective film on at least one side of the elongate polarizer) containing the elongate polarizer obtained by forming a non-polarization part can be cut by the said cutting method.

The polarizing plate obtained by the manufacturing method of this invention is used suitably for image display apparatuses (liquid crystal display apparatus, organic electroluminescent device) with cameras, such as mobile phones, such as a smart phone, a notebook PC, and a tablet PC.

10: non-polarization part
100: long polarizing plate
110: single-leaf polarizing plate
200: non-polarization part detection means
300: cutting means

Claims (6)

A long polarizing plate having a non-polarizing portion arranged at predetermined intervals in the long direction and in the width direction is sequentially cut with a cutting edge from one side in the width direction of the long polarizing plate to the other at each predetermined long direction feed pitch. including that,
When cutting the long polarizing plate, a reference line set on the long polarizing plate is detected, and based on the obtained detection information, the cutting blade is rotated to determine the cutting direction, and then the position of the non-polarizing part is detected And, on the basis of the position of the detected non-polarization part, after positioning the cutting edge, a long polarizing plate is cut, and a single-leaf polarizing plate having one non-polarization part is obtained one by one, a manufacturing method of a polarizing plate. The method of claim 1,
Two reference line detection means are formed on the cutting edge,
detecting the baseline by using the two baseline detecting means,
The method of manufacturing a polarizing plate, wherein the direction of cutting is determined by adjusting the angle between the line connecting the two reference line detecting means and the reference line. The method of claim 1,
The manufacturing method of the polarizing plate whose said reference line is the width direction short side of the said elongate polarizing plate. 3. The method of claim 2,
A method for producing a polarizing plate, wherein a line connecting two reference line detection means and a long direction of a long polarizing plate are parallel. An apparatus for manufacturing a polarizing plate which is used in the manufacturing method according to any one of claims 1 to 4 and cuts out the single-leaf polarizing plate having one non-polarizing part from the long polarizing plate one by one,
a conveying means for conveying the elongate polarizing plate at a predetermined long direction conveying pitch;
Non-polarization part detection means for detecting the said non-polarization part which the said elongate polarizing plate has;
and a cutting blade for cutting the long polarizing plate by determining a cutting position based on the detection information from the non-polarizing part detecting means,
The said cutting edge is comprised rotatably, The manufacturing apparatus of the polarizing plate. delete

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