KR20140139419A - System and method for producing optical film roll - Google Patents

Abstract

The present invention relates to an optical film roll manufacturing system capable of slitting a long patterned web-type optical film sheet in an appropriate point with high precision. The system conveys the long patterned web-type optical film sheet, slits the sheet; and winds the long web-type optical film into a roll to manufacture an optical film roll. The system includes: a slit line which is and end face surface of the optical film in the length direction; an imaging unit recording the adjacent patterns; and an alignment unit adjusting the location of a slit unit which slits the optical film sheet in the width direction based on the imaging result obtained by the imaging unit.

Description

TECHNICAL FIELD [0001] The present invention relates to an optical film roll manufacturing system and an optical film roll manufacturing method,

The present invention relates to a manufacturing system and a manufacturing method for producing an optical film roll by winding a long web type optical film into a long web type optical film slit in the longitudinal direction thereof and winding the long web type optical film to a roll .

In a stereoscopic image display apparatus such as a 3D-LCD TV displaying stereoscopic images, a right eye image display region (first phase difference region) and a left eye image display region (second phase difference region) having different phase differences are alternately arranged in the width direction A patterned retardation film disposed thereon, a patterned film in which a light-transmitting region and a light-shielding region are arranged, or the like is used. In these films, patterns are formed in advance.

In order to produce an optical film roll, generally, a wide optical film is slitted to a predetermined width, and the optical film after the slit is wound into a roll. However, in the case of the optical film in which the pattern is formed in advance as described above, it is required not only to make the slit width proper, but also to slit the pattern at a proper position at a high precision.

Patent Document 1 discloses a roll on which a patterned phase difference film is wound.

Japanese Patent Laid-Open Publication No. 2012-32445

However, Patent Document 1 does not specifically describe the slit at the designated position according to the pattern.

In addition, Patent Document 1 does not specifically describe a method of slitting a pattern at a proper position with high accuracy.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical film roll manufacturing system and a manufacturing method thereof that can slit a long web type optical film web having a pattern at a proper position with respect to a pattern with high precision, .

As a result of diligent studies for solving the above problems, the present invention has been completed as follows. That is, the present invention provides a system for producing an optical film roll by slitting a long web-type optical film having a pattern while conveying it, and winding the obtained long web-type optical film into a roll shape,

An image pickup section for picking up a slit line which is an end face in the longitudinal direction of the optical film being transported and a pattern in the vicinity thereof,

And an alignment section for adjusting the width direction position of the optical film based on the imaging result obtained by the imaging section.

According to this configuration, since the width direction position of the optical film is adjusted based on the width direction position of the slit line and the pattern in the vicinity thereof, the optical film can be slit at a proper position with respect to the pattern with high precision .

Examples of the pattern include a line (reference line) parallel to the longitudinal direction of the optical film original end or a line (reference line) parallel to the conveying direction (longitudinal direction) of the long web type optical film original to be conveyed.

In the present specification, the term " width direction " refers to a direction perpendicular to the conveying direction (longitudinal direction) of the long web-type optical film original to be conveyed.

Further, another invention of the present invention is a manufacturing system for manufacturing an optical film roll by slitting a long web-type optical film having a pattern and winding the resulting long web-type optical film into a roll shape,

A feeding part for loosening the optical film raw material from the optical film raw material roll,

A conveying section for conveying the downstream end of the optical film strip fed from the feeding section,

A slit section for continuously cutting the optical film end portion conveyed by the carry section along the longitudinal direction to obtain the long web type optical film,

An imaging section that is disposed downstream of the slit section and that picks up a slit line that is an end face in the cut longitudinal direction of the optical film being transported and a pattern in the vicinity thereof,

An alignment unit configured to adjust a position of the optical film original in the width direction based on an image pickup result obtained by the image pickup unit;

And a winding portion for winding the optical film obtained in the slit portion into a roll shape.

According to this configuration, since the position of the slit portion in the width direction is adjusted based on the position of the slit line and the pattern in the vicinity thereof in the width direction, the optical film can be slit at a proper position with respect to the pattern with high accuracy .

In one embodiment of the present invention, the imaging unit picks up a pattern of the slit line and its vicinity while bringing the optical film into close contact with a convex curved surface formed in an arc shape along the longitudinal direction of the optical film.

According to this configuration, it is possible to eliminate the rattling during conveyance of the optical film fabric, and to reduce the measurement deviation when the position of the slit line in the width direction is measured. Therefore, .

As an embodiment of the present invention, the apparatus further includes an illumination unit for illuminating an imaging region including the slit line of the optical film imaged by the imaging unit.

According to this configuration, by illuminating the imaging region including the slit line, the slit line and the pattern in the vicinity thereof become prominent, so that the image to be picked up becomes clear and the measurement error can be reduced. It is preferable to irradiate the slit line (and the pattern) with the reflected light method rather than irradiate the slit line (and the pattern) with the transmission light method to the imaging unit because the edge of the slit line (and the pattern) becomes more conspicuous.

Further, as one embodiment of the present invention, the aligning section has a feeding position adjusting section for adjusting a position in the width direction of the feeding section.

In the above-described embodiment of the invention, the alignment section has a web alignment section that adjusts the width direction position of the optical film original, which is a part of the carry section and is conveyed by the carry section.

It is possible to adjust the widthwise position of the feeding portion by the feeding position adjusting portion and adjust the position of the optical film raw material in the width direction during feeding by the web aligning portion. The adjustment by the feeding position adjustment unit is larger than that of the web alignment unit (the movement distance is larger), and the alignment of the web alignment unit is suitable for performing a small alignment. Thus, the optical film can be slit at a proper position with respect to the pattern with high accuracy.

The web aligning section has, for example, at least two rolls and a moving mechanism for freely moving the roll in its longitudinal direction. Two rolls and an optical film fabric are arranged so that the longitudinal direction of the two rolls is parallel to the width direction of the optical film, and the optical film fabric is wound around the two rolls. By moving the two rolls in the width direction by the moving mechanism while conveying the optical film raw material, the position in the width direction of the optical film can be finely adjusted.

In addition, as an embodiment of the above invention, a display unit for displaying a slit line (and a pattern) of an image picked up by the image pickup unit is further provided.

According to this configuration, it is possible to visually confirm whether or not the slit is formed at an appropriate position with respect to the pattern by the operator by outputting (displaying) the slit line (and pattern) picked up by the image pickup section to a display section such as a monitor.

Further, as an embodiment of the above invention, the optical film is a patterned retardation film in which first retardation regions and second retardation regions having different retardation from each other are alternately arranged in the width direction.

Examples of the patterned retardation film include a patterned retardation film (a retardation film for a stereoscopic image display apparatus) provided in an apparatus for displaying a stereoscopic image by displaying a right eye image and a left eye image, for example.

In one embodiment of the present invention, the optical film comprises a patterned retardation film in which first retardation regions and second retardation regions differing in phase difference from each other are alternately arranged in the width direction, and polarized light having an absorption axis parallel to the longitudinal direction Film retardation film-integrated polarizer.

In one embodiment of the invention, the optical film is a pattern film in which the light-transmitting region and the light-shielding region are alternately arranged in the width direction.

As the cutting means of the slit portion, for example, a cutter and a laser may be used.

The cutting means of the slit portion may be provided at least two in the width direction of the optical film.

Another method for producing an optical film roll of the present invention is a method for producing an optical film roll by slitting a long web-type optical film having a pattern and conveying the obtained long web-type optical film in a roll form,

An image pickup step of picking up a slit line which is an end face in the longitudinal direction of the optical film being transported and a pattern in the vicinity thereof,

And an alignment step of adjusting the width direction position of the optical film based on the imaging result obtained in the imaging step.

Another method for producing an optical film roll of the present invention is a method for producing an optical film roll by slitting a long web-type optical film having a pattern and conveying the obtained long web-type optical film in a roll form,

A feeding step of loosening the optical film raw material from the optical film raw material roll,

A conveying step of conveying the downstream end of the optical film strip fed in the feeding step,

A slit step of continuously cutting the optical film raw material conveyed by the conveying step along the longitudinal direction of the patterned film in which the optical film is disposed with the light transmitting area and the light shielding area to obtain the long web type optical film,

An image pickup step of picking up a slit line, which is an end face in the cut longitudinal direction of the optical film carried on the downstream side of the slit process, and a pattern in the vicinity thereof,

An alignment step of adjusting a position in the width direction of the optical film original based on an imaging result obtained in the imaging step,

And a winding step of winding the optical film obtained in the slit process into a roll shape.

According to the present invention, there is provided a system for manufacturing an optical film roll and a method of manufacturing the optical film roll, which can slit a long web-type optical film web having a pattern at a proper position with respect to a pattern with high precision.

FIG. 1A is a schematic view of a system for manufacturing an optical film roll according to Embodiment 1. FIG.
1B is a view showing an example of a slit portion and a first image pickup portion;
2 is a view showing an example of a reference line of the first embodiment;
3 is a view exemplifying a field-of-view range of the first imaging unit;
4 is a schematic view of a system for manufacturing an optical film roll according to Embodiment 2. Fig.
5 is a schematic view of a system for manufacturing an optical film roll according to Embodiment 3;
6 is a schematic view of a system for manufacturing an optical film roll according to Embodiment 4;
7 is a schematic view of a system for manufacturing an optical film roll according to Embodiment 5. Fig.

(Embodiment 1)

The long web-type optical film original end of the first embodiment has a patterned retardation film in which a first retardation region and a second retardation region having different retardations from each other are alternately arranged in the width direction and a polarizing film having an absorption axis parallel to the longitudinal direction (An example of a polarizing plate integrated with a patterned retardation film). The film width of the optical film fabric is, for example, 1200 mm or more and 2400 mm or less.

The long web-type optical film fabric has a reference line L1 parallel to the longitudinal direction thereof. This reference line L1 is a part of the pattern of the patterned retardation film. The number of the reference lines L1 may be one or two or more. The line type of the reference line may be, for example, a solid line or a broken line, but a solid line is preferable. The size of the width orthogonal to the longitudinal direction of the baseline and the color of the baseline are not particularly limited as long as the image can be imaged by the imaging section and the image can be analyzed.

The construction of the optical film roll production system 1 of Embodiment 1 will be described with reference to Figs. 1A and 1B. Fig. Fig. 2 shows an example of a reference line L1 formed on the long web-type optical film fabric 80. Fig.

The feeding portion 10 feeds a long web-type optical film material 80 having a reference line parallel to the longitudinal direction from the original roll R1. The feeding portion 10 has a rotating mechanism for rotating the far-end roll R1. The rotating mechanism may be free rotation, or may be rotatably driven by being connected to a motor.

The conveying section 50 conveys the optical film fabric 80 fed out from the feeding section 10 downstream.

The conveying section 50 may be configured to send the optical film material 80 via a nip roll (not shown), and the rolls R2, R3, and R4 may be formed by the winding section 70 disposed on the downstream side The optical film may be transported by winding the long web-type optical film after the slit, or may be transported on both sides thereof. The carrying section 50 has conveying rolls 51a and 51b up to the slit section 30 and has conveying rolls 52 and 53 and 54 at the rear end of the slit section 30. In this embodiment, It is preferable that the transport rolls 51a, 51b, 52 are formed of, for example, rolls provided with cylindrical rolls and grooves.

The slit portion 30 successively cuts the optical film end 80 conveyed by the carry section 50 along the longitudinal direction to obtain the optical films 81, 82, 83, and 84 of the long web type. 1A, the winding portion for winding the optical film 84, which is one end portion in the width direction of the optical film original end 80, is omitted.

As a cutting means of the slit portion 30, for example, a cutter and a laser can be used. A cutter is preferable from the viewpoint of the quality of the cut surface, and more preferably, shear cut is made by opposing the cut material with two cutters. In the first embodiment, the slit portion 30 is arranged so that the three cutting means are linearly arranged in the width direction of the optical film raw end 80.

The first imaging section 41 is disposed on the downstream side of the slit section 30. [ The first image pickup section 41 is provided with a slit line C1 (or C2, C3) which is the cut longitudinal end face of the optical film 80 conveyed by the carry section 50 and a pattern . The first image pickup section 41 is constituted by, for example, an area camera. As shown in Fig. 1B and Fig. 3, the first image pickup section 41 picks up the slit line C1 and the reference line L1 within the field of view.

The first imaging section 41 picks up the slit line C1 and the reference line L1 while bringing the optical film material 80 into close contact with a convex curved surface formed in an arc shape along the longitudinal direction of the optical film end 80. [ As the convex curved surface, a roll 52 constituting a part of the carry section 50 is used.

A ring illumination 411 is used as an illumination unit for illuminating an imaging area including the slit line C1 of the optical film original 80 captured by the first imaging unit 41. [ The first imaging section 41 is disposed on the same side as the ring illumination 411 with respect to the optical film material 80 and at a position spaced from the ring illumination 411 as shown in Fig. Between the first imaging unit 41 and the optical film end 80, there is provided a circular polarizer having a cross-Nicol relationship with one of the regions forming the reference line and a relation of the other region with the parallel Nicol.

The image picked up by the first image pickup section 41 is subjected to image analysis in the information processing apparatus 90. The determination unit 91 of the information processing device 90 detects the slit line C1 obtained by image analysis and the edge in the longitudinal direction of the reference line L1 (detection line L11). Fig. 3 shows an example of the detection line L11 and the slit line C1. The determination unit 91 determines whether the slit line C1 is located at a predetermined standard position (a position at which the slit line C1 should be present) in the field of view of the camera (or within a predetermined range). The determination unit 91 measures the vertical distance from the detection line L11 of the reference line L1 or the view right range (imaging area) to the slit line C1 at the upper right end of the view of Fig. 3, It is judged whether or not it is within the range. When the determination unit 91 determines that the position of the slit line C1 is located at a predetermined standard position (the position where the slit line C1 should be located) (or is located within a predetermined range), no instruction is required, For example, an image may be output to the monitor 95 of the display unit. The " standard position or a predetermined range " may be set based on, for example, the vertical distance from the detection line L11 of the reference line L1.

On the other hand, when the determination unit 91 determines that the slit line C1 is not located at a predetermined standard position (the position where the slit line C1 should be present) (or is not disposed within a predetermined range) The movement direction and the movement amount of the part 10 are obtained. The arithmetic unit 92 measures the displacement direction and displacement amount of the slit line C1 of the image from the standard position, for example, and obtains the movement direction (the direction opposite to the displacement direction) and the movement amount of the extraction unit 10. The movement amount may be the same as the shift amount, or may be larger or smaller than the shift amount. Then, the control unit 93 instructs the movement direction and the movement amount obtained as described above to the following position adjustment unit 60.

The feeding position adjustment section 60 adjusts the position in the width direction of the feeding section 10 based on the image pickup result (image) obtained by picking up the image by the first image pickup section 41. The feeding position adjustment unit 60 has a moving mechanism for moving the feeding unit 10 in the width direction thereof and is configured to move the feeding unit 10 by the moving mechanism based on the moving direction and the moving amount sent from the control unit 93 Adjust the position in the width direction. The moving mechanism may be, for example, a linear driving mechanism.

The winding unit 70 winds the long web-type optical films 81, 82, and 83 cut by the slit portion 30 into rolls R2, R3, and R4, respectively. The winding unit 70 has a motor and a rotation mechanism (not shown), and rotates the rolls R2, R3, and R4 at the same speed in synchronism with each other to wind the long web-type optical films 81, 82,

The slit imaging sections 43 and 44 are disposed on the downstream side of the slit section 30 (and the first imaging section 41) and are provided with slit lines C1 and C2 which are end faces in the cut longitudinal direction of the optical film to be transported . The slit imaging sections 43 and 44 are constituted by line cameras.

The slit image pickup sections 43 and 44 pick up a slit line (cut surface after slit) while bringing the optical films 81 and 82 into close contact with convex curved surfaces formed in an arc shape along the longitudinal direction of the optical films 81 and 82. As the convex curved surface, rolls 53 and 54 constituting a part of the carry section 50 are respectively used.

Bar lights 431 and 441 are used as illumination units for illuminating the imaging area including the slit lines C1 and C2 picked up by the slit imaging units 43 and 44. [ 1A, the slit imaging sections 43 and 44 are disposed on the same side of the optical films 81 and 82 as the bar lights 431 and 441 and at positions spaced apart from the bar lights 431 and 441 . Between the slit imaging sections 43 and 44 and the optical films 81 and 82, there is provided a circular polarizer having a cross-Nicol relationship with one region forming the reference line and a relationship of parallel Nicol with the other region .

The images picked up by the slit imaging units 43 and 44 can be sent to a monitor and displayed. Visual confirmation of the slit lines C1 and C2 by the operator can be easily performed by outputting (displaying) the slit position picked up by the slit image pickup sections 43 and 44 to the monitor 95. [ Fig. 4 shows an example of an image of the slit line C1 picked up by the slit imaging units 43 and 44. Fig.

(Embodiment 2)

The construction of the optical film roll production system 2 of the second embodiment will be described with reference to Fig. A configuration different from that of the first embodiment will be described, and a description of the same configuration will be omitted.

The transporting section 50 moves the position of the optical film material 80 in the width direction between the feeding section 10 and the first image pickup section 42 on the basis of the image picked up by the first image pickup section 42 And has a web aligning section 20 for adjusting. The first imaging section 42 has the same configuration as the first imaging section 41 of the first embodiment. The information processing apparatus 90 has the same configuration as the first embodiment and instructs the web alignment unit 20 to determine the movement direction and the movement amount in the same manner as in the first embodiment and instructs the web alignment unit 20 to make the web alignment unit 20, .

When the determination unit 91 determines that the slit line C1 of the image is not located at the predetermined standard position (the position where the slit line C1 should be present) (or is not disposed within a predetermined range) The movement direction and the movement amount of the alignment section 20 are obtained. The arithmetic unit 92 obtains the movement direction (the direction opposite to the shift direction) and the movement amount of the web alignment unit 20 by, for example, measuring the slip line C1 of the image from the standard position and measuring the displacement direction and the shift amount. The movement amount may be the same as the shift amount, or may be larger or smaller than the shift amount.

Then, the control unit 93 instructs the web alignment unit 20 to calculate the movement direction and the movement amount obtained above. The web alignment unit 20 adjusts the position in the width direction of the optical film material 80 based on the movement direction and the movement amount.

The web aligning section 20 of the second embodiment includes a first aligning roll 21, a second aligning roll 22 and a straight line for freely moving the first and second aligning rolls 21, And a drive mechanism 23. The first and second alignment rolls 21 and 22 and the optical film fabric 80 are placed so that the longitudinal direction of the first and second alignment rolls 21 and 22 and the width direction of the optical film end 80 are parallel . The optical film material 80 is wound on the first alignment roll 21 at an angle of 90 degrees from the bottom side to the right side by 90 degrees with respect to the first alignment roll 21, ) At an angle of 90 ° downward. The first and second alignment rolls 21 and 22 are moved in the film width direction by the linear driving mechanism 23 while the optical film material 80 is being conveyed by the carry section 50, In the width direction.

(Embodiment 3)

The configuration of the optical film roll production system 3 of Embodiment 3 will be described with reference to Fig. The third embodiment has both the configurations of the first and second embodiments. The alignment portion includes both the leading position adjusting portion 60 and the web alignment portion 20. [

The feeding position adjusting unit 60 adjusts the widthwise position of the feeding unit 10 and the web aligning unit 20 adjusts the position of the optical film 80 in the width direction during feeding. The alignment by the feeding position adjustment unit 60 is larger than that of the web alignment unit 20 (the movement distance is larger), and the alignment of the web alignment unit 20 is smaller.

(Fourth Embodiment)

The construction of the optical film roll production system 4 of Embodiment 4 will be described with reference to Fig. Instead of the first imaging unit 41, slit imaging units 43 and 44 are used.

The images (slit lines C1 and C2) picked up by the slit imaging sections 43 and 44 are subjected to image analysis by the information processing apparatus 90, respectively. The determination unit 91 of the information processing apparatus 90 detects the slit lines C1 and C2 of the image obtained by the image analysis. As shown in Fig. 3, it is determined whether the slit line C1 is located at a predetermined standard position (a position where the slit line should exist) (or is located within a predetermined range) in the field of view of the camera. The determination unit 91 measures the vertical distance from, for example, a partial line of the pattern to the slit line, and determines whether the measured value is within a predetermined value range. When the determination unit 91 determines that the position of the slit line C1 (and / or C2) of the image is located at a predetermined standard position (or is within a predetermined range), no instruction is required, And output an image to the monitor 95 of the display unit. The determination unit 91 may determine based on an image picked up by one of the slit image pickup units 43 and 44, or may be determined based on both images.

On the other hand, when the determination unit 91 determines that the slit line C1 (and / or C2) of the image is not at the preset standard position (or is not disposed within the predetermined range) 10) are obtained. The arithmetic unit 92 measures the displacement direction and displacement amount of the slit line from the standard position, and obtains the movement direction (direction opposite to the displacement direction) and the movement amount of the extraction unit 10, for example. The movement amount may be the same as the shift amount, or may be larger or smaller than the shift amount. The control unit 93 then instructs the feeding position adjusting unit 60 to determine the moving direction and the moving amount obtained as described above. The feeding position adjusting section (60) adjusts the position in the width direction of the feeding section (10) according to the moving direction and the moving amount.

(Embodiment 5)

The construction of the optical film roll production system 5 of Embodiment 5 will be described with reference to Fig. In the fifth embodiment, when the determination unit 91 determines that the slit line C1 (and / or C2) of the image is not at the predetermined standard position (or is not disposed within the predetermined range), the calculation unit 92 The movement direction and the movement amount of the web alignment unit 20 are obtained. The calculation unit 92 measures the displacement direction and the shift amount of the slit line from the standard position and obtains the movement direction (the direction opposite to the displacement direction) and the movement amount of the web alignment unit 20, for example. The movement amount may be the same as the shift amount, or may be larger or smaller than the shift amount. Then, the control unit 93 instructs the web alignment unit 20 to calculate the movement direction and the movement amount obtained above. The web alignment unit 20 adjusts the widthwise position of the web alignment unit 20 according to the movement direction and the movement amount.

(Embodiment 6)

The sixth embodiment has the configurations of both the fourth and fifth embodiments. Based on the measurement results (moving direction, moving amount) measured by the information processing apparatus 90, based on the imaging results (images) obtained by the imaging by the slit imaging units 42 and 43, the feeding position adjusting unit 60 and the web alignment Adjust both sides of the part (20).

<Manufacturing Method>

A method for producing an optical film roll is a method for producing an optical film roll by slitting while conveying a long web type optical film having a pattern and winding the resulting long web type optical film into a roll shape, And an alignment step of adjusting a position in the width direction of the optical film based on an image pickup result obtained in the image pickup step.

Another method for producing an optical film roll is a manufacturing method for producing an optical film roll by slitting while conveying a long web type optical film having a pattern and winding the obtained long web type optical film into a roll shape, A feeding step of feeding the raw material from the original roll of the optical film; a feeding step of feeding the raw material of the optical film fed out in the feeding step downstream; and a feeding step of feeding the raw material of the optical film conveyed by the feeding step, A slit process for obtaining the optical film of the long web type by successively cutting along a longitudinal direction which is a pattern film in which a region and a light shielding region are disposed; a slit process which is performed on the downstream side of the slit process, An image pickup step of picking up a slit line which is an end face of the image pickup element and a pattern in the vicinity thereof, And a winding step of winding the optical film obtained in the slit process into a roll shape.

(Another embodiment of the optical film)

In the above-described embodiment, the optical film is used as an example of the patterned retardation film-integrated polarizing plate. However, the present invention is not limited thereto. For example, the pattern film of the optical film may be arranged such that the light- Patterned film.

1: Production system of optical film roll
10:
20: Web alignment section
21: first alignment roll
22: 2nd alignment roll
30:
41: First image pickup section
411: Ring lighting
43, 44: Slit imaging section
431, 441: Bar illumination
50:
60:
70:
80: long web type optical film fabric
81, 82, 83, 84: long web type optical film
90: Information processing device
L1: Baseline
C1: slit line
R1: fabric roll
R2, R3, R4: Roll

Claims (12)

A system for producing an optical film roll by slitting a long web-type optical film having a pattern and conveying the resulting long web-type optical film in a roll form,
An image pickup section for picking up a slit line which is an end face in the longitudinal direction of the optical film being transported and a pattern in the vicinity thereof,
And an alignment section for adjusting a position in the width direction of the optical film based on the imaging result obtained by the imaging section. A manufacturing system for manufacturing an optical film roll by slitting a long web-type optical film having a pattern and winding the obtained long web-type optical film into a roll shape,
A feeding part for loosening the optical film raw material from the optical film raw material roll,
A conveying section for conveying the downstream end of the optical film strip fed from the feeding section,
A slit section for continuously cutting the optical film end portion conveyed by the carry section along the longitudinal direction to obtain the long web type optical film,
An imaging section that is disposed downstream of the slit section and that picks up a slit line that is an end face in the cut longitudinal direction of the optical film being transported and a pattern in the vicinity thereof,
An alignment unit configured to adjust a position of the optical film original in the width direction based on an image pickup result obtained by the image pickup unit;
And a winding section for winding the optical film obtained in the slit section in a roll shape. 3. The method according to claim 1 or 2,
Wherein the imaging section picks up a pattern of the slit line and its vicinity while bringing the optical film into close contact with a convex curved surface formed in an arcuate shape along the longitudinal direction of the optical film. The method according to claim 1,
Further comprising an illumination section for illuminating an imaging area including the slit line of the optical film imaged by the imaging section. The method according to claim 1,
Wherein the aligning section has a feeding position adjusting section for adjusting a position in the width direction of the feeding section. The method according to claim 1,
Wherein the alignment section has a web alignment section that adjusts a position in the width direction of the optical film original that is a part of the carry section and that is conveyed in the carry section. The method according to claim 1,
Further comprising a display section for displaying an image picked up by said image pickup section. The method according to claim 1,
Wherein the optical film is a patterned phase difference film in which a first retardation region and a second retardation region differing in phase difference from each other are alternately arranged in a width direction. 9. The method of claim 8,
Wherein the optical film comprises a patterned retardation film-integrated polarizing plate in which a patterned retardation film in which a first retardation region and a second retardation region differing in retardation from each other are alternately arranged in the width direction, and a polarizing film having an absorption axis parallel to the longitudinal direction, , An optical film roll production system. The method according to claim 1,
Wherein the optical film is a pattern film in which a light-transmitting region and a light-shielding region are disposed. A method for producing an optical film roll by winding a long web-type optical film into a roll shape while slitting while conveying a long web type optical film raw material having a pattern,
An image pickup step of picking up a slit line which is an end face in the longitudinal direction of the optical film being transported and a pattern in the vicinity thereof,
And an alignment step of adjusting a position in the width direction of the optical film original based on the imaging result obtained in the imaging step. A method for producing an optical film roll by winding a long web-type optical film into a roll shape while slitting while conveying a long web type optical film raw material having a pattern,
A feeding step of loosening the optical film raw material from the optical film raw material roll,
A conveying step of conveying the downstream end of the optical film strip fed in the feeding step,
A slit step of continuously cutting the optical film raw material conveyed by the conveying step along the longitudinal direction of the patterned film in which the optical film is disposed with the light transmitting area and the light shielding area to obtain the long web type optical film,
An image pickup step of picking up a slit line, which is an end face in the cut longitudinal direction of the optical film carried on the downstream side of the slit process, and a pattern in the vicinity thereof,
An alignment step of adjusting a position in the width direction of the optical film original based on an imaging result obtained in the imaging step,
And a winding step of winding the optical film obtained in the slit step in a roll form.

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