Measurement method, management method, and method for manufacturing optical components

Abstract

A technique for appropriately managing the distance between an end portion of a first component layer and an end portion of a second component layer included in an end portion region of a laminate comprising a first component layer and a second component layer is provided. A measurement method according to one embodiment is a method for measuring an end portion region of a laminate comprising a first component layer and a second component layer, wherein the first component layer has a first end portion, the second component layer has a second end portion located on the same side as the first end portion when viewed in a stacking direction of the first component layer and the second component layer in the laminate, and the end portion region is a region extending from the first end portion to the second end portion in the laminate, the method comprising: an irradiation step of irradiating the end portion region with inspection light; a detection step of detecting reflected light as the inspection light reflected by the end portion region; and a calculation step of calculating the distance between the first end portion and the second end portion based on the detection result of the reflected light.

Description

Technical Field

[0001] The present invention relates to a measuring method, a management method, and a method for manufacturing an optical component. Background Art

[0002] As described in Patent Document 1, there is known a technique in which a second member layer formed using a coating liquid is formed on a first member layer (a sheet-like object in Patent Document 1) to obtain a laminate of the first and second member layers.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2000-24565

[0006] In the laminate of the first component layer and the second component layer, when the distance between the ends between the first end of the first component layer and the second end of the second component layer (the end on the same side as the first end of the first component layer) deviates from a given range, various defects can be produced. For example, as described in patent document 1, when the second component layer is a coating layer formed by coating with liquid, if the distance between the ends deviates from a given range, then in the process after forming the coating layer, there is coating liquid squeezed out from the first component layer, thereby the coating liquid contaminates other components (for example, a roller, a component to be bonded to the first component layer, etc.). Or, when the above-mentioned laminate is a component, when the distance between the ends deviates from a given range, the configuration relationship of the first component layer and the second component layer deviates from the required state. Therefore, there is a worry that the performance of the components of the above-mentioned laminate cannot play the required performance or the component cannot be properly assembled in other devices, etc.

[0007] Therefore, in a laminate of a first member layer and a second member layer, a technique is required for appropriately managing the end-to-end distance between the first end of the first member layer and the second end of the second member layer to fall within a predetermined range. Summary of the Invention

[0008] Problems to be solved by the invention

[0009] Therefore, one object of the present invention is to provide a method for measuring and managing the distance between the end of the first component layer and the end of the second component layer, which is included in the end region of a laminated body of the first component layer and the second component layer. Another object of the present invention is to provide a method for manufacturing an optical component using the above-mentioned management method.

[0010] Means for solving problems

[0011] A measurement method according to one aspect of the present invention is a method for measuring an end region of a stacked body comprising a first component layer and a second component layer, wherein the first component layer has a first end, and the second component layer has a second end located on the same side as the first end when viewed from the stacking direction of the first component layer and the second component layer in the stacked body, and the end region is a region extending from the first end to the second end in the stacked body, and the method comprises: an irradiation step of irradiating the end region with inspection light; a detection step of detecting reflected light as the inspection light reflected by the end region; and a calculation step of calculating the distance between the first end and the second end based on the detection result of the reflected light.

[0012] In the above-mentioned measurement method, inspection light is irradiated onto the end region, and the reflected light is detected. Furthermore, based on the detection result of the reflected light, the distance between the first end and the second end is calculated. Since the distance between the first end and the second end is calculated based on the optical measurement result, the distance between the first end and the second end can be calculated more appropriately.

[0013] The first member layer may be a resin film layer, and the second member layer may be a coating layer containing a binder or an adhesive.

[0014] The inspection light may also have a stripe pattern with alternating bright and dark portions. In this case, multiple detection results can be easily obtained from multiple directions by illuminating the end region. This makes it easier to detect the first and second ends.

[0015] The shape of the stripe pattern may also be periodically varied. Thus, even with only one device outputting inspection light, various optical information of the end region can be obtained.

[0016] For example, the shape of the stripe pattern may periodically change between the first pattern and the second pattern, and the extension direction of the bright portion and the dark portion in the second pattern may be orthogonal to the extension direction of the bright portion and the dark portion in the first pattern.

[0017] The laminate may be a long laminate, and the irradiation step and the detection step may be performed while the laminate is conveyed in the longitudinal direction.

[0018] Other aspects of the present invention relate to a management method for managing an end area of ​​a stack including a first component layer and a second component layer, wherein the first component layer has a first end, the second component layer has a second end located on the same side as the first end when viewed from the stacking direction of the first component layer and the second component layer in the stack, and the end area is an area in the stack extending from the first end to the second end, and the method comprises: an irradiation process of irradiating inspection light on the end area; a detection process of detecting reflected light as the inspection light reflected by the end area; a calculation process of calculating the distance between the first end and the second end based on the detection result of the reflected light; and a determination process of determining whether the calculated distance is within a given range.

[0019] In the above-mentioned management method, inspection light is irradiated on the above-mentioned end area, and the reflected light is detected. Furthermore, based on the detection result of the reflected light, the distance between the above-mentioned first end and the above-mentioned second end is calculated. Since the distance between the above-mentioned first end and the above-mentioned second end is calculated based on the optical measurement result in this way, the distance between the above-mentioned first end and the above-mentioned second end can be calculated more appropriately. By performing the above-mentioned determination process based on the calculated distance between the above-mentioned first end and the above-mentioned second end in this way, the distance between the above-mentioned first end and the above-mentioned second end can be appropriately managed.

[0020] The first member layer may be a resin film layer, and the second member layer may be a coating layer containing a binder or an adhesive.

[0021] The inspection light may also have a striped pattern with alternating bright and dark portions. In this case, multiple detection results can be easily obtained by illuminating the end region from multiple directions. This makes it easier to detect the first and second ends.

[0022] The shape of the stripe pattern may also be periodically changed. Thus, even if only one device outputs the inspection light, various optical information of the end region can be obtained.

[0023] The shape of the stripe pattern periodically changes between the first pattern and the second pattern, and the extending directions of the bright portion and the dark portion in the second pattern may be orthogonal to the extending directions of the bright portion and the dark portion in the first pattern.

[0024] The method may further include, before the irradiation step, laminating the second member layer on the laminated member having the first member layer or on the first member layer.

[0025] In the lamination step, the second member layer may be laminated on the first member layer by applying a coating material on the first member layer.

[0026] Alternatively, if the calculated distance is not within the predetermined range, the laminating step may further include a step of changing the coating area of ​​the coating material, and the laminating step, the irradiation step, the detection step, and the determination step may be repeated until the calculated distance is within the predetermined range. This allows for more reliable acquisition of a laminated body in which the distance between the first end portion and the second end portion is within the predetermined range.

[0027] The stacked body may be a long stacked body, and the stacking step, the irradiation step, and the detection step may be performed while the stacked body is conveyed in the longitudinal direction.

[0028] A method for manufacturing an optical component according to another aspect of the present invention is a method for manufacturing an optical component including the management method according to the present invention.

[0029] Effects of the Invention

[0030] According to one aspect of the present invention, a method for measuring and managing the distance between the end of the first component layer and the end of the second component layer included in the end region of a laminated body of the first component layer and the second component layer can be provided. According to another aspect of the present invention, a method for manufacturing an optical component using the above-mentioned management method can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a figure for demonstrating the management method concerning one embodiment.

[0032] Figure 2 This is a diagram showing a first pattern as an example of a stripe pattern.

[0033] Figure 3 1 and 2 are diagrams showing a second pattern as another example of the stripe pattern.

[0034] Figure 4 This is a flowchart of a management method according to one embodiment.

[0035] Figure 5 It is a figure which shows the structure of the phase difference plate (optical component) manufactured in 2nd Embodiment.

[0036] Figure 6 Is used to illustrate Figure 5 FIG. 1 is a diagram showing the steps included in the method for manufacturing a phase difference plate.

[0037] Figure 7 It is an explanation Figure 6 Figure showing a process following the process shown.

[0038] Figure 8 It is an explanation Figure 7 Figure showing a process following the process shown.

[0039] Figure 9 It is used to illustrate the implementation of the roll-to-roll method. Figure 5 FIG. 1 is a diagram illustrating a method for manufacturing a phase difference plate.

[0040] Figure 10 This is a diagram for explaining an example of a method of changing the coating area.

[0041] Figure 11 The figures show the results of photographing the film end (first end) and the applied end (second end).

[0042] Figure 12 It is a figure which shows the other imaging result of the film edge part (1st edge part) and the coating edge part (2nd edge part).

[0043] Figure 13 It is a figure for demonstrating modification example 1.

[0044] Figure 14 It is a figure for explaining the modification example 2.

[0045] Figure 15 This is a diagram for explaining Modification 3.

[0046] Figure 16 This is a diagram for explaining Modification 3.

[0047] Description of Reference Numerals

[0048] 2. 2A: phase difference plate;

[0049] 4: laminate;

[0050] 11: resin film (first component layer);

[0051] 11a: end (first end);

[0052] 20: coating layer;

[0053] 20a: end (second end);

[0054] 100: laminate;

[0055] 102: 1st component layer;

[0056] 102a: end portion (first end portion);

[0057] 104: 2nd component layer;

[0058] 104a: end;

[0059] 112: striped pattern;

[0060] 112a: Ming Department;

[0061] 112b: dark part;

[0062] 112A: Pattern 1;

[0063] 112B: 2nd pattern;

[0064] 114: image processing device;

[0065] A1, A2: end areas;

[0066] D1, D1a, D1b, D1c, D1d, D2, D2a: distance (distance between ends);

[0067] L1: Check light;

[0068] L2: reflected light. DETAILED DESCRIPTION

[0069] Below, with reference to the attached Figure 1 The embodiments of the present invention will be described. The same reference numerals are used for the same elements, and repeated descriptions are omitted. The dimensional ratios in the drawings do not necessarily correspond to the dimensional ratios in the description.

[0070] like Figure 1 As shown in FIG. 1 , a method for managing the distance (distance between ends) D1 between the end portion (first end portion) 102a of the first component layer 102 of the stacked body 100 and the end portion 104a (second end portion) of the second component layer 104 of the stacked body 100 will be described as a first embodiment. Subsequently, an example of the management method described in the first embodiment will be described as a second embodiment, while giving examples of the first component layer 102 and the second component layer 104. Below, for the sake of convenience, as shown in FIG. Figure 1 As shown in FIG. 1 , the stacking direction of the first member layer 102 and the second member layer 104 is referred to as the z direction, and the direction perpendicular to the z direction is referred to as the x direction.

[0071] (First embodiment)

[0072] Figure 1 It is a figure for demonstrating the management method concerning one embodiment. Figure 1The illustrated laminate 100 includes a first component layer 102 and a second component layer 104. The second component layer 104 is laminated on the first component layer 102. The first component layer 102 and the second component layer 104 can be, for example, components formed of an optically transparent material. For example, the first component layer 102 is a resin film layer, and the second component layer 104 is a coating layer containing a coating material (e.g., an adhesive or pressure-sensitive adhesive). Examples of the first component layer 102 and the second component layer 104 are described in detail in other embodiments.

[0073] In the management method of the first embodiment, the distance D1 between end 102a of the first component layer 102, one of the ends in the x-direction, and end 104a of the second component layer 104, one of the ends in the x-direction, is managed. End 104a is the end located on the same side as end 102a, as viewed in the stacking direction (z-direction) of the first component layer 102 and the second component layer 104. When the second component layer 104 is a coating material, the length of the second component layer 104 in the x-direction is shorter than the length of the first component layer 102. Depending on the material of the second component layer 104 (e.g., a resin film), the length of the second component layer 104 in the x-direction may be longer than the length of the first component layer 102.

[0074] In the management method, use Figure 1 The reflecting optical system 106 shown measures the distance D1. The reflecting optical system 106 includes a light source unit 108 and an imaging unit 110. The end region A1 is a region near the end in the x direction of the stacked body 100. Specifically, it is a region extending from the end 102a to the end 104a.

[0075] The light source unit 108 outputs inspection light L1 toward the end region A1 of the stacked body 100. The wavelength of the inspection light L1 can be any wavelength that allows for capturing an image of the end region A1, depending on the materials of the first component layer 102 and the second component layer 104. An example of the wavelength of the inspection light L1 is a white LED light source having a peak wavelength within 450 ± 30 nm. For example, the inspection light L1 can be configured to illuminate the end region A1 in a planar manner.

[0076] The imaging unit 110 is a photodetector that detects the reflected light L2 that is the inspection light L1 reflected by the end area A1. The imaging unit 110 is, for example, a two-dimensional sensor such as a CCD camera or a CMOS camera.

[0077] The imaging unit 110 inputs image data to the image processing device 114. The image processing device 114 produces an image of the end area A1 based on the image data input from the imaging unit 110. The image processing device 114 has a display function for displaying the produced image to the user. The image processing device 114 may also have a function of analyzing the produced image to detect the end 102a and the end 104a and a function of calculating the distance D1. The image processing device 114 may also have at least one of a function of controlling the imaging timing of the imaging unit 110 and a function of controlling the output of the inspection light L1 of the light source unit 108. The image processing device 114 may also be, for example, a dedicated device for implementing the management method involved in the first embodiment. Alternatively, a program for implementing the management method including the above-mentioned image processing may be implemented in a personal computer, and the above-mentioned personal computer may be caused to function as the image processing device 114.

[0078] An example of the light source unit 108 will be described. Figure 2 as well as Figure 3 As shown, the light source unit 108 may be configured to output the inspection light L1 having a stripe pattern 112 in which bright portions 112 a and dark portions 112 b are alternately arranged. Figure 2 The X direction is shown in Figure 2 The Y direction, in which the intermediate bright portion 112 a and the dark portion 112 b extend, is a direction perpendicular to the X direction. Figure 3 The X and Y directions are related to Figure 2 The X direction and the Y direction are the same direction.

[0079] The shape (pattern shape) of the stripe pattern 112 can also be changed. Figure 2 as well as Figure 3 In the embodiment, the bright portion 112a (or dark portion 112b) can also be arranged along Figure 2 as well as Figure 3 The shape of the stripe pattern 112 is changed by moving in the direction of the arrow or by changing the width of the bright portion 112a (or dark portion 112b).

[0080] Further, in Figure 2 The stripe pattern 112 shown is referred to as the first pattern 112A. Figure 3When the stripe pattern 112 shown is called the second pattern 112B, the light source unit 108 may also be configured to periodically change between the first pattern 112A and the second pattern 112B. The second pattern 112B is a pattern in which the extension direction of the bright portion 112a and the dark portion 112b in the second pattern 112B is orthogonal to the extension direction of the bright portion 112a and the dark portion 112b in the first pattern 112A. Even in the case of periodic changes between the first pattern 112A and the second pattern 112B, the bright portion 112a (or the dark portion 112b) may be in the first pattern 112A and the second pattern 112B. Figure 2 as well as Figure 3 The movement may be in the direction of the arrow, or the width of the bright portion 112a (or dark portion 112b) may change.

[0081] When the inspection light L1 has a stripe pattern 112, the light source unit 108 may include, for example, a light source comprising a plurality of point light sources (e.g., LEDs) arranged two-dimensionally and a control device that controls the lighting state of each LED. In this case, by controlling the lighting state of the plurality of LEDs using the control device, bright portions 112a and dark portions 112b can be formed. Furthermore, the stripe pattern 112 formed by the bright portions 112a and dark portions 112b can be varied.

[0082] The light source unit 108 may also output a signal without Figure 2 as well as Figure 3 The planar inspection light L1 has a bright portion 112a and a dark portion 112b as shown. In this case, the light source unit 108 may be a planar light source or a light source composed of a plurality of point light sources (e.g., LEDs) arranged two-dimensionally. In the following description, "planar inspection light L1" means a state without the bright portion 112a and the dark portion 112b as described above.

[0083] The shape of the stripe pattern 112 can be obtained by, for example, an image processing device 114 (see Figure 1 In this case, the image processing device 114 may also control them so as to synchronize the light source unit 108 and the imaging unit 110.

[0084] Figure 4 This is a flowchart that illustrates an example of a management method. Figure 4 The management method will be described by taking as an example a case where the first member layer 102 is a long resin film and the second member layer 104 is a coating layer containing a coating material.

[0085] like Figure 4As shown, the second member layer 104 is stacked on the first member layer 102 (stacking step S01). The second member layer 104 can be formed, for example, by applying a coating material to form the second member layer 104 while conveying the first member layer 102 in the longitudinal direction. The coating material can be applied, for example, by gravure coating.

[0086] Next, while the first member layer 102 is being conveyed, the distance D1 is measured by a measuring method according to one embodiment (see Figure 1 )(Measurement process S02).

[0087] In the measurement process S02, the inspection light L1 is irradiated toward the end area A1 of the stacked body 100 (irradiation process S02a). The reflected light L2 from the end area A1 is detected by the imaging unit 110 (detection process S02b). Based on the image of the end area A1 thus obtained (detection result), the distance D1 is calculated (calculation process S02c). Specifically, the end 102a and the end 104a are determined based on the image obtained by the imaging unit 110, and the distance between them is calculated. The determination of the end 102a and the end 104a and the calculation of the distance D1 based thereon can be implemented by the image processing device 114 or by the user based on the image produced by the image processing device 114. In the case where the inspection light L1 periodically varies between the first pattern 112A and the second pattern 112B, for example, the image processing device 114 uses the image data obtained for the reflected light L2 in each of the first pattern 112A and the second pattern 112B to produce an image. In order to obtain the above-mentioned single image, for example, the image processing device 114 may control the timing of the shape change of the stripe pattern 112 and the imaging timing of the imaging unit 110 .

[0088] After the measurement step S02, it is determined whether the distance D1 is within a predetermined range (determination step S03). This determination may be made by the user or by the image processing device 114 by comparing a predetermined range input in advance with the distance D1.

[0089] In the determination step S03 , when the distance D1 is determined to be within the predetermined range (“YES” in the determination step S03 ), the production of the laminate 100 may be continued under the same conditions as before the determination step S03 .

[0090] On the other hand, in the judgment process S03, when the distance D1 is judged to be outside the given range ("NO" in the judgment process S03), in the stacking process S01, a change process S04 is implemented to change the stacking conditions in the stacking process S01 (specifically, the coating area of ​​the coating material for forming the second component layer 104).

[0091] When the changing step S04 is performed, the stacking step S01 , the measuring step S02 , the judging step S03 , and the changing step S04 are performed until the distance D1 is judged to be within a predetermined range in the judging step S03 .

[0092] By implementing the above-described management method, the distance D1 between the end portion 102 a and the end portion 104 a in the stacked body 100 can be appropriately managed to fall within a predetermined range.

[0093] For example, if the second component layer 104 is the aforementioned coating layer and the coating material forming the coating layer is an adhesive or a binder, a pair of press rollers may be used to bond other components to the first component layer 102 via the second component layer 104. In this case, the predetermined range of distance D1 is typically set to prevent contamination of the press rollers due to extrusion of the coating material onto the pair of press rollers. Therefore, by managing distance D1 within the predetermined range, contamination of the press rollers can be reliably prevented. As a result, products obtained by bonding other components to the first component layer 102 via the second component layer 104 can be efficiently manufactured.

[0094] The case where the distance D1 between the end portion 102a and the end portion 104a included in the end portion region A1 is measured and managed has been described. Figure 1 As shown, the end 102b and the distance between the ends 104b (end-to-end distance) D2 included in the end area A2 (the area extending from the end 102b to the end 104b) of the stack 100 can also be measured and managed in the same manner. In this case, a reflective optical system 106 is also provided on the end 104b side. The end 102b of the first component layer 102 is the end on the opposite side of the end 102a in the x-direction. The end 104b of the second component layer 104 is the end on the opposite side of the end 104a in the x-direction. In Figure 1 In FIG. 1 , the light source unit 108 and the imaging unit 110 are arranged along the x direction when viewed from the z direction. However, the arrangement of the light source unit 108 and the imaging unit 110 is not limited to Figure 1 The light source unit 108 and the imaging unit 110 may be arranged, for example, along a direction perpendicular to the x direction and the z direction.

[0095] When both the distance D1 and the distance D2 are measured and managed, these can also be performed simultaneously. Further, in the determination step S03, as long as at least one of the distance D1 and the distance D2 is outside the given range set for the distance D1 and the distance D2, the distance D1 and the distance D2 can be measured and managed simultaneously. Figure 4 The change step S04 shown is sufficient.

[0096] (Second embodiment)

[0097] A method for manufacturing an optical component using the management method described in the first embodiment will be described. Figure 5 Schematic diagram of a phase difference plate (optical component) 2 manufactured by the manufacturing method according to the second embodiment. In the second embodiment, for the sake of convenience, the same as in the first embodiment, the phase difference plate (optical component) 2 is used. Figure 5 The x- and z-directions are shown.

[0098] The phase difference plate 2 has a resin film 11, an orientation film 12, a first phase difference layer 13, an adhesive layer 22 and a second phase difference layer 33. The phase difference plate 2 is an optical component (or optical element) that imparts a certain phase difference to the light incident on the phase difference plate 2 through the first phase difference layer 13 and the second phase difference layer 33. The phase difference plate 2 can be used as a part of a circular polarizing plate for optical compensation in an image display device such as a liquid crystal image display device or an organic EL image display device. The manner in which the first phase difference layer 13 and the second phase difference layer 33 are a cured product of a polymerizable liquid crystal compound is described.

[0099] The resin film 11 is a support for the alignment film 12, the first retardation layer 13, the adhesive layer 22, and the second retardation layer 33. Examples of materials for the resin film 11 include triacetylcellulose (TAC), polyethylene terephthalate (PET), and polycycloolefin (COP). The thickness of the resin film 11 is 20 μm to 120 μm. The length of the resin film 11 in the x-direction is 500 mm to 2000 mm.

[0100] The orientation film 12 is laminated on the resin film 11. Figure 5 In the illustrated embodiment, the length of the alignment film 12 in the x direction is shorter than the length of the resin film 11 .

[0101] The thickness of the alignment film 12 is usually in the range of 0.01 μm to 10 μm, preferably in the range of 0.05 μm to 5 μm, and more preferably in the range of 0.1 μm to 3 μm.

[0102] An example of the alignment film 12 is an alignment film that tilts the molecular axis of a vertical alignment film, a horizontal alignment film, or a polymerizable liquid crystal compound, and can be selected based on the first phase difference layer 13. The material of the alignment film 12 is not limited as long as it is a resin used as a known material for a phase difference plate. For example, as the alignment film 12, a cured product obtained by curing a previously known monofunctional or polyfunctional (meth)acrylate monomer under a polymerization initiator can be used.

[0103] The first phase difference layer 13 is a layer that provides a predetermined phase difference to light incident on the first phase difference layer 13. As mentioned above, the first phase difference layer 13 is a cured product of a polymerizable liquid crystal compound. Figure 5In the embodiment shown, the length of the first retardation layer 13 in the x-direction is shorter than the length of the resin film 11 and longer than the length of the alignment film 12. Therefore, both ends of the alignment film 12 in the x-direction are covered by the first retardation layer 13. The thickness of the first retardation layer 13 is typically 0.2 μm to 3 μm, preferably 0.2 μm to 2 μm.

[0104] The adhesive layer 22 is provided on the first phase difference layer 13, and is a layer that joins the first phase difference layer 13 and the second phase difference layer 33. The material of the adhesive layer 22 is an adhesive or a bonding agent. The adhesive or bonding agent may be a material well known in the technical field involved in the present disclosure. Examples of adhesives include active energy ray curing adhesives such as ultraviolet (UV) curing resins, and water-based adhesives such as polyvinyl alcohol resin aqueous solutions. Examples of adhesives include adhesive compositions whose main components are (meth) acrylic resins, rubber resins, urethane resins, ester resins, silicone resins, polyvinyl ether resins, etc. In the following, the case where the adhesive forming the adhesive layer 22 is an active energy ray curing adhesive such as a UV curing resin is described.

[0105] The length of the adhesive layer 22 in the x direction is shorter than the length of the first retardation layer 13. The thickness of the adhesive layer 22 is, for example, 0.1 μm to 10 μm, preferably 0.5 μm to 5 μm, and more preferably 1 μm to 3 μm.

[0106] The second phase difference layer 33 is a layer that provides a predetermined phase difference to light incident on the second phase difference layer 33. As mentioned above, the second phase difference layer 33 is a cured product of a polymerizable liquid crystal compound. Figure 5 In the retardation plate 2 shown, the length of the second retardation layer 33 in the x direction is the same as the length of the adhesive layer 22. The thickness of the second retardation layer 33 is usually 0.2 μm to 3 μm, preferably 0.2 μm to 2 μm.

[0107] use Figures 6 to 8 , the outline of the manufacturing method of the phase difference plate 2 is described. When manufacturing the phase difference plate 2, prepare Figure 6 The first optical layered body 10 and the second optical layered body 30 are shown. The first optical layered body 10 and the second optical layered body 30 extend in directions perpendicular to the x direction and the z direction. Figures 6 to 8 It is a schematic diagram of a cross section perpendicular to the longitudinal direction of the first optical layered body 10 and the second optical layered body 30 .

[0108] The first optical layered body 10 is a laminated member obtained by laminating a resin film 11, an alignment film 12, and a first retardation layer 13. The resin film 11, the alignment film 12, and the first retardation layer 13 extend in the longitudinal direction of the first optical layered body 10. Therefore, the first optical layered body 10 is an elongated laminated member.

[0109] Figure 6 The illustrated first optical laminate 10 can be manufactured by sequentially forming an orientation film 12 and a first phase difference layer 13 on a resin film 11. The orientation film 12 can be formed, for example, by coating a material for the orientation film 12 on the resin film 11 and curing the coating. The first phase difference layer 13 can be formed, for example, by coating a material for the first phase difference on the resin film 11 on which the orientation film 12 is formed and curing the coating. The relationship between the lengths in the x direction of the resin film 11, the orientation film 12, and the first phase difference layer 13 can be obtained by, for example, using Figure 5 As shown in the description.

[0110] Figure 6 The illustrated second optical laminate 30 is a laminated structure obtained by laminating a resin film 31, an orientation film 32, and a second phase difference layer 33. The second optical laminate 30 is a long laminated structure like the first optical laminate 10. The example of the resin film 31 is the same as the example of the resin film 11. The material of the resin film 31 can be the same as or different from the material of the resin film 11. The orientation film 32 is an orientation film corresponding to the second phase difference layer 33. The relationship between the lengths of the resin film 31, the orientation film 32, and the second phase difference layer 33 in the x direction is the same as the relationship between the lengths of the resin film 11, the orientation film 12, and the first phase difference layer 13 in the x direction of the first optical laminate 10. Therefore, the length of the second phase difference layer 33 in the x direction of the second optical laminate 30 is greater than Figure 5 The second retardation layer 33 of the retardation plate 2 shown is long.

[0111] After preparing the first optical laminate 10 and the second optical laminate 30, an adhesive is applied on the first phase difference layer 13 to form a coating layer 20. Next, the first optical laminate 10 and the second optical laminate 30 are stacked with the coating layer 20 interposed therebetween so that the coating layer 20 and the second phase difference layer 33 are in contact with each other. Figure 7 The stack 4 shown.

[0112] Thereafter, the coating layer 20 is irradiated with active energy rays such as ultraviolet rays to cure the adhesive forming the coating layer 20 . Thus, the first optical layered body 10 and the second optical layered body 30 are bonded together via the adhesive layer 22 , which is the cured product of the coating layer 20 .

[0113] After the first optical layered body 10 and the second optical layered body 30 are bonded together, Figure 8 As shown, the resin film 31 is peeled off from the first optical layered body 10 to obtain the phase difference plate 2 .

[0114] The bonding force of the adhesive layer 22 to the second retardation layer 33 is set to be stronger than the bonding force of the orientation film 32 to the second retardation layer 33. Furthermore, the length of the adhesive layer 22 in the x direction is shorter than the length of the second retardation layer 33 in the x direction, and the second retardation layer 33 is also bonded to the resin film 31. Therefore, when peeling the resin film 31, Figure 8 As shown, the portion of the second retardation layer 33 located outside the adhesive layer 22 in the x direction and the alignment film 32 are also peeled from the first optical layered body 10 together with the resin film 31 .

[0115] Hereinafter, for convenience of description, a member produced separately from the phase difference plate 2 when the resin film 31 is peeled from the first optical layered body 10 is referred to as a peeling member 6 .

[0116] In the second embodiment, the management method described in the first embodiment is implemented by using the resin film 11 as the first member layer 102 and the coating layer 20 as the second member layer 104. Figure 4 as well as Figure 6 The management method applied to the above-mentioned production method will be described.

[0117] like Figure 6 As shown, the resin film 11 corresponds to the first component layer 102, and the coating layer 20 corresponds to the second component layer 104. Therefore, the ends 11a and 11b of the resin film 11 correspond to the ends 102a and 102b, respectively, and the ends 20a and 20b of the coating layer 20 correspond to the ends 104a and 104b, respectively. Furthermore, the distance D1a between the ends 11a and 11b corresponds to the distance D1, and the distance D2a between the ends 20a and 20b corresponds to the distance D2.

[0118] form Figure 6 The process of applying the coating layer 20 shown corresponds to Figure 4 After the step of forming the coating layer 20 (the lamination step S01), the lamination step S01 is performed. Figure 4 In the measurement step S02 shown, the distance D1a between the end 11a of the resin film 11 and the end 20a of the coating layer 20 is measured. In the second embodiment, the distance D2a between the end 11b of the resin film 11 and the end 20b of the coating layer 20 is also measured.

[0119] Next, implement Figure 4 In the determination step S03 shown, it is determined whether the distance D1a and the distance D2a are within the predetermined ranges set for the distances D1a and D2a, respectively. The predetermined ranges corresponding to the distances D1a and D2a, respectively, may be the same or different.

[0120] In the determination step S03, if the distance D1a and the distance D2a are determined to be within the corresponding given ranges, the production of the phase difference plate 2 is continued under the same adhesive application conditions (specifically, the same coating area) as when forming the coating layer 20 being measured. On the other hand, in the determination step S03, if at least one of the distance D1a and the distance D2a is determined to be outside the corresponding given range, the change step S04 is implemented to change the adhesive application area (lamination conditions).

[0121] When the changing step S04 is performed, the stacking step S01 to the changing step S04 are repeated until it is determined in the determining step S03 that the distance D1a and the distance D2a are both within the corresponding predetermined ranges.

[0122] use Figure 9 , an example of a method for manufacturing the phase difference plate 2 using the management method described in the first embodiment will be described in detail. Figure 9 As shown, the case where the phase difference plate 2 is manufactured using the roll-to-roll method will be described.

[0123] The first optical layered body 10 and the second optical layered body 30 in a roll form are placed in the unwinding section 40a and the unwinding section 40b. The first optical layered body 10 is conveyed in the longitudinal direction of the first optical layered body 10 by a conveying roller 42 toward a pair of pressing rollers 44. Similarly, the second optical layered body 30 is conveyed in the longitudinal direction of the second optical layered body 30 by the conveying roller 42 toward the pair of pressing rollers 44. Since the pair of pressing rollers 44 also contribute to the conveyance of the first optical layered body 10 and the second optical layered body 30, the pair of pressing rollers 44 also serve as conveying rollers.

[0124] The coating device 50 disposed on the conveying path of the first optical laminate 10 from the unwinding portion 40a to the pair of press rollers 44 applies an adhesive to the first retardation layer 13 of the first optical laminate 10, thereby forming a coating layer 20 (equivalent to Figure 4 Lamination process S01).

[0125] The coating device 50 includes an adhesive supply unit 52 and a coating roller 54. The adhesive supply unit 52 is a supply source of adhesive to the surface of the coating roller 54. The coating roller 54 is a roller that applies adhesive to the first retardation layer 13 of the first optical layered body 10 being conveyed. An example of the coating roller is a gravure roller.

[0126] When the adhesive is applied by the coating device 50 , the contact area between the first optical layered body 10 (specifically, the first retardation layer 13 ) and the coating roller 54 is adjusted by the coating area adjuster 60 . Figure 101 is a diagram showing an example of the coating area adjuster 60. Figure 10 In FIG, the first optical layered body 10 is schematically shown as a single film. Figure 10 In the figure, the longitudinal direction of the first optical layered body 10 is the conveyance direction of the first optical layered body 10 .

[0127] The coating area adjuster 60 has a pair of separated claws 62 and a support portion 64 that supports the pair of claws 62 along the conveying direction of the first optical layered body 10. The coating area adjuster 60 is configured so that the pair of claws 62 are in contact with the coating side of the adhesive in the first optical layered body 10. By moving the coating area adjuster 60 in the width direction of the first optical layered body 10 (a direction perpendicular to the long side direction), the contact between the area between the pair of claws 62 in the first optical layered body 10 and the coating roller 54 can be avoided. Therefore, by adjusting the position of the coating area adjuster 60 in the width direction of the first optical layered body 10, the coating area of ​​the adhesive can be adjusted. Figure 9 as well as Figure 10 In the embodiment, the coating region adjuster 60 is provided on one edge portion in the width direction of the first optical layered body 10. Figure 9 In the method for manufacturing the phase difference plate 2 described above, the coating area adjuster 60 is also arranged on the other edge side in the width direction of the first optical layered body 10. Figure 9 , a pair of claws 62 of the coating area adjuster 60 are schematically shown.

[0128] return Figure 9 , the process after the adhesive is applied to the first optical laminate 10 by the coating device 50 will be described. Figure 9 As shown in FIG, the first optical layered body 10 coated with the adhesive is conveyed between a pair of press rollers 44. Figure 9 4 , for the sake of explanation, the coating layer 20 formed on the first optical layered body 10 in the region between the coating device 50 and the press roller 44 is shown.

[0129] The second optical layered body 30 is conveyed together with the first optical layered body 10 by a pair of press rollers 44. At this time, the conveying paths of the first optical layered body 10 and the second optical layered body 30 are adjusted so that the second phase difference layer 33 of the second optical layered body 30 is opposite to the coating layer 20 and the centers of the first optical layered body 10 and the second optical layered body 30 in the width direction are aligned.

[0130] The first optical layered body 10 and the second optical layered body 30 fed to the pair of press rollers 44 are pressed in the thickness direction by the pair of press rollers 44 and are temporarily bonded to each other via the coating layer 20 .

[0131] The stacked body 4 of the first optical stacked body 10 and the second optical stacked body 30 fed out from the pair of press rollers 44 is conveyed in the longitudinal direction of the first optical stacked body 10 and the second optical stacked body 30 .

[0132] An active energy ray irradiation unit 56 is disposed downstream of the pair of press rollers 44 (at a position subsequent to the pair of press rollers 44) in the conveying direction of the first optical layered body 10 and the second optical layered body 30. The active energy ray irradiation unit 56 irradiates the layered body 4 with active energy rays to cure the coating layer 20. This forms the adhesive layer 22, which is a cured product of the adhesive, and allows the first optical layered body 10 and the second optical layered body 30 to be bonded together.

[0133] In the conveying direction of the laminate 4, the resin film 31 of the second optical laminate 30 is peeled off from the laminate 4 by a peeling roller 46 arranged downstream of the active energy ray irradiation section 56 (after the active energy ray irradiation section 56). In this way, the phase difference plate 2 and the peeling member 6 can be separated from the laminate 4. Since the peeling roller 46 also helps to convey the laminate 4, the phase difference plate 2 and the peeling member 6, the peeling roller 46 also serves as a conveying roller.

[0134] The obtained phase difference plate 2 may be wound into a roll shape by a winding unit, for example. The peeling member 6 may be discarded as it is, or may be discarded after one end thereof is wound into a roll shape by a winding unit.

[0135] exist Figure 9 In the manufacturing method exemplified, the step of forming the coating layer 20 on the first optical laminate 10 by the coating device 50 corresponds to Figure 4 Furthermore, in the conveying path of the first optical laminate 10, between the coating device 50 and the pair of press rollers 44 (for example, the position shown by the arrow α1 or the arrow α2), a Figure 1 The reflecting optical system 106 is shown. The distance D1a and the distance D2a ( Figure 4 Measurement step S02).

[0136] In the measurement step S02, Figure 9As schematically indicated by arrow α1, the distance D1a and the distance D2a in the region between the conveying rollers 42, 42 in the first optical layered body 10 can also be measured. Alternatively, as schematically indicated by arrow α2, the distance D1a and the distance D2a in the region located on the conveying roller 42 in the first optical layered body 10 can also be measured. In the measurement between the conveying rollers as indicated by arrow α1, the measurement can also be performed from the side opposite to the coating layer 20. Here, the case of measurement at the position indicated by arrow α1 is described, but the same is true for the measurement between the conveying rollers.

[0137] The inspection light L1 output from the light source section 108 of the reflective optical system 106 is, for example, Figure 2 as well as Figure 3 As shown, in the case of the stripe pattern 112, for example, Figure 2 as well as Figure 3 The X direction or the Y direction shown is set as the conveyance direction of the first optical layered body 10 .

[0138] When the inspection light L1 is a fringe pattern 112 that periodically changes between a plurality of patterns (e.g., periodically changes between a first pattern 112A and a second pattern 112B), the period of change of the first pattern 112A and the second pattern 112B and the imaging speed of the imaging unit can be set in consideration of the conveying speed of the first optical layered body 10. Specifically, while the fringe pattern 112 changes between a plurality of patterns a certain number of times, the period of change of the fringe pattern 112 and the imaging speed of the imaging unit can be set to such an extent that images of substantially the same region in the first optical layered body 10 being conveyed can be acquired.

[0139] After the distance D1a and the distance D2a are measured, the determination step S03 is performed. In the determination step S03, if it is determined that both the distance D1a and the distance D2a are within the corresponding predetermined ranges, the production of the phase difference plate 2 is continued.

[0140] On the other hand, in the determination step S03, when it is determined that at least one of the distance D1a and the distance D2a is outside the corresponding given range, a change step S04 is implemented to adjust the adhesive application area using the application area adjuster 60. Specifically, the adhesive application area is changed by adjusting the position of the position adjuster in the width direction of the first optical laminate 10. When the change step S04 is implemented, the steps of applying the adhesive to the first optical laminate 10 (laminating step S01) and the like are repeated until it is determined that the distance D1a and the distance D2a are within the given range in the determination step S03. Figure 4 The measurement step S02 and the judgment step S03 shown and the above-mentioned changing step S04.

[0141] like Figure 9 As shown, when the first optical layered body 10 and the second optical layered body 30 are pressed by a pair of pressing rollers 44 to bond them together, the given ranges of the distance D1a and the distance D2a are set so that the adhesive forming the coating layer 20 does not come into contact with the pressing rollers 44 and the pressing rollers 44, and are set so that when the peeling member 6 is peeled off from the laminate 4 of the first optical layered body 10 and the second optical layered body 30 (refer to Figure 8 as well as Figure 9 ), the desired structure can be obtained as the phase difference plate 2.

[0142] Therefore, for example, if the distance D1a and the distance D2a are outside the predetermined ranges set therefor, there is a concern that the adhesive may adhere to the pressure rollers 44, thereby contaminating the two pressure rollers 44. Alternatively, when the peeling member 6 is peeled from the laminate 4, there is a concern that the portion to be peeled may remain on the side of the phase difference plate 2 to be the product.

[0143] On the other hand, in the manufacturing method of the phase difference plate 2, the management method described in the first embodiment is implemented. In the measurement step S02 of the management method, the phase difference plate 2 is manufactured using Figure 1 The reflective optical system 106 shown in FIG. 1 calculates the distance D1a and the distance D2a using the optically acquired image. Therefore, the distance D1a and the distance D2a can be calculated efficiently and accurately while the first optical layered body 10 is being conveyed. Thus, it is possible to appropriately determine whether the distances D1a and D2a are within the corresponding given ranges.

[0144] When at least one of the distance D1a and the distance D2a is outside the given range, a change process S04 for changing the coating area of ​​the adhesive is implemented. Furthermore, the change process S04 is performed until both the distance D1a and the distance D2a become within the given range in the judgment process S03. Therefore, the distance D1a and the distance D2a can be set to be within the given range respectively. As a result, it is possible to prevent the defective adhesive from being attached to the pressure roller 44 as described above. In this case, it is possible to avoid, for example, the maintenance of the pressure roller 44 with the adhesive attached, thereby improving the manufacturing efficiency of the phase difference plate 2. Because the distance D1a and the distance D2a can be set to be within the given range, it is possible to prevent the defective portion to be peeled from remaining on the side of the phase difference plate 2 to be the product. Therefore, the manufacture of the phase difference plate 2 as a defective product can be avoided, and as a result, the manufacturing yield of the phase difference plate 2 is improved.

[0145] In the case of implementing the management method, examples of the inspection light L1 output by the light source unit 108 may be either the inspection light L1 having the stripe pattern 112 described in the first embodiment or the planar inspection light L1. For the planar inspection light L1 and the inspection light L1 having the stripe pattern 112, for example, compared with the case of using linear inspection light, the angular dependence of the irradiation area of ​​the inspection light L1 on the extension direction of the end (or end) can be reduced, thereby making it easy to detect the positions of the end 11a and end 20a and end 11b and end 20b. Furthermore, in the case where the inspection light L1 has the stripe pattern 112, multiple images illuminating the end area from multiple directions can be acquired at one time. Therefore, it is easy to detect the end 11a and end 20a and end 11b and end 20b. By using Figure 2 as well as Figure 3 By periodically changing the shape of the stripe pattern 112 as indicated by the arrows in the figure, or by periodically changing the shape between the first pattern 112A and the second pattern 112B, a plurality of pieces of imaging information can be acquired using a single reflective optical system 106. Therefore, even when imaging optically transparent members such as the resin film 11 and the coating layer 20 used as the phase difference plate 2, the positions of the end portions 11a and 20a, and the end portions 11b and 20b can be more reliably detected.

[0146] Figure 11 The drawings show images of the coating layer 20 actually applied to the resin film 11 included in the first optical layered body 10 . Figure 11 Yes Figure 9 As shown by arrow α1 , the image is taken of a region of the first optical layered body 10 that is not located on the conveying rollers 42 (a region between the conveying rollers 42 or between the conveying roller 42 and the pair of press rollers 44 ). Figure 11 “I” in the column of the inspection light in ∘ means the planar inspection light L1 . Figure 11 The "II" in the inspection light column in represents the inspection light L1 having the stripe pattern 112 that periodically changes between the first pattern 112A and the second pattern 112B. Figure 11 The "film end" in FIG. 1 corresponds to the end 11a, and the "coating end" corresponds to the end 20a. Figure 11 As shown, it can be understood that both the planar inspection light L1 and the inspection light L1 of the stripe pattern 112 detect the end 11 a (film end) and the end 20 a (coating end).

[0147] In the stripe pattern 112, bright areas 112a and dark areas 112b are arranged alternately. This allows for the acquisition of multiple images by illuminating the image from multiple directions. This allows for instant analysis of the acquired images, generating both concavity and convexity images and texture images, enabling stable inspections independent of surface conditions or measurement environment.

[0148] When the first optical layered body 10 is placed on the conveying roller 42, for example, regular reflection is generated by the surface of the conveying roller 42. For example, by using the stripe pattern 112, multiple images illuminated from multiple directions can be captured. Therefore, even when the surface of the conveying roller 42 is, for example, a mirror surface, the influence of regular reflection caused by the surface of the conveying roller 42 can be reduced. Therefore, it is easy to detect the end 11a, the end 20a, the end 11b, and the end 20b. In other words, even in an environment susceptible to regular reflection, it is easy to detect the end 11a, the end 20a, the end 11b, and the end 20b. Figure 12 It is shown as Figure 9 2, which is an image obtained by photographing the coating layer 20 coated on the resin film 11 of the first optical layered body 10 in the region located on the conveying roller 42 of the first optical layered body 10. Figure 12 The meanings of "II" in the inspection light column, "film end" and "coating end" in the image are the same as Figure 11 The same situation applies. Figure 12 As can be understood, even in the region on the conveying roller 42 in the first optical layered body 10 , the end 11 a (film end) and the end 20 a (coating end) can be detected by using the stripe pattern 112 .

[0149] exist Figure 9 In the illustrated manner, after the laminate 4 is formed, the stripping member 6 is then stripped from the laminate 4. However, the laminate 4 may be temporarily wound to form a roller. In this case, the stripping member 6 is stripped from the laminate 4 while the laminate 4 is re-rolled out from the roller of the laminate 4. The phase difference plate 2 obtained by stripping the stripping member 6 from the laminate 4 can be transported without the phase difference surface (the surface of the phase difference plate 2 on the opposite side of the resin film 11) coming into contact with a conveying roller, etc., while performing treatments such as bonding a polarizing plate to the phase difference plate 2. In this case, for example, damage to the phase difference surface can be prevented.

[0150] The first optical layered body 10 may be an optical layered body in which the first retardation layer 13 is directly laminated on the resin film 11 . The second optical layered body 30 may be an optical layered body in which the second retardation layer 33 is directly laminated on the resin film 31 .

[0151] (Variation 1)

[0152] Management methods can also be used Figure 9 As shown by the arrow β, the stacked body 4 is conveyed between a pair of pressing rollers 44 and a peeling roller 46. In this case, Figure 13 As shown, the management method described in the first embodiment is implemented by using the resin film 11 of the first optical laminate 10 and the resin film 31 of the second optical laminate 30 as the first component layer 102 and the second component layer 104 described in the first embodiment. In modification 1, the end 11a of the resin film 11 corresponds to the end 102a, and the end 31a of the resin film 31 corresponds to the end 104a. Furthermore, the distance D1b in the x direction between the end 11a and the end 31a corresponds to the distance D1. Figure 13 In FIG. 1 , in order to clearly indicate the distance D1 b , the center of the second optical layered body 30 is shown as being offset from the center (center in the x direction) of the first optical layered body 10 .

[0153] In Modification 1, a reflective optical system 106 is provided for the stacked body 4 conveyed between a pair of pressing rollers 44 and a peeling roller 46, and the distance D1b is measured in the measuring step S02 of the management method. Furthermore, in the determining step S03, it is determined whether the distance D1b is within a predetermined range.

[0154] Typically, in order to stack the first optical layered body 10 and the second optical layered body 30 so that their centers in the x-direction coincide with each other, the positions of the end 11a and the end 31a are the same in the x-direction. Therefore, for example, the given range for the distance D1b includes a certain manufacturing error relative to the case where the distance is zero.

[0155] When the distance D1b is within a given range, the manufacture of the phase difference plate 2 is continued. On the other hand, when the distance D1b is outside the given range, for example, in the change process S04, the manufacturing conditions are changed so that the distance D1b becomes within a given range. For example, the conveying path (condition) of the first optical stack 10 and the second optical stack 30 is changed. The change process S04 is repeated until the distance D1b becomes within a given range in the determination process S03. For example, the manufacturing process of the phase difference plate 2 and the change process S04 are repeated until the determination process S03 is implemented.

[0156] When the distance D1b is outside the predetermined range, the second optical laminate 30 is not bonded to the first optical laminate 10 at the desired position. Consequently, the arrangement of the adhesive layer 22 and the second optical laminate 30 also deviates from the desired position. Consequently, when the peeling member 6 is peeled from the laminate 4, there is a concern that the portion to be peeled may remain on the side of the phase difference plate 2 to be produced as a product.

[0157] In contrast, as in Modification 1, the above-mentioned defects can be prevented by applying the management method described in the first embodiment to the laminate 4 between the pair of pressing rollers 44 and the peeling roller 46. As a result, it is easy to manufacture good phase difference plates 2 and the manufacturing yield of phase difference plates 2 is improved.

[0158] (Variation 2)

[0159] Management methods can also be used Figure 9 As shown by arrow γ1, the management method is implemented for the phase difference plate 2 obtained by peeling the peeling member 6 from the laminate 4 using the peeling roller 46. Alternatively, the management method can be implemented for the peeling member 6 obtained by peeling the peeling member 6 from the laminate 4 using the peeling roller 46, as shown by arrow γ2.

[0160] The following describes a case where the management method is implemented for the phase difference plate 2 as shown by the arrow γ1. Figure 14 As shown, the management method is implemented using the resin film 11 as the first component layer 102 and the second retardation layer 33 on the adhesive layer 22 as the second component layer 104. When the management method is implemented on the retardation plate 2, the end 11a of the resin film 11 corresponds to the end 102a, and the end 33a of the second retardation layer 33 corresponds to the end 104a. Furthermore, the distance D1c in the x-direction between the end 11a and the end 33a corresponds to the distance D1.

[0161] When the management method is implemented at the position of arrow γ1, the reflective optical system 106 is arranged for the phase plate 2 in the rear stage of the peeling roller 46, and the measurement step S02 included in the management method is implemented to measure the distance D1c. In the determination step S03, it is determined whether the distance D1c is within a predetermined range.

[0162] As long as the peeling member 6 is properly peeled off by the peeling roller 46, the distance D1c between the end portion 11a and the end portion 33a in the longitudinal direction of the phase difference plate 2 is constant. On the other hand, if the peeling roller 46 cannot be properly peeled off, the peeled portion of the second phase difference layer 33 of the second optical laminate 30 remains on the phase difference plate 2 side. Therefore, for example, the distance D1c between the end portion 11a and the end portion 33a of the phase difference plate 2 changes.

[0163] It is believed that when the distance D1c is outside a given range (a range that takes into account the manufacturing error in the initially set distance), a defect (or abnormality) such as the portion to be peeled off in the second phase difference layer 33 remains on the side of the phase difference plate 2 will occur. Therefore, by determining whether the distance D1c is within a given range in the determination step S03 of the management process, it is possible to detect the presence or absence of an abnormality when the peeling member 6 is peeled off from the stack 4. Assuming that an abnormality is detected, in the change step S04, the manufacturing conditions are changed so that the distance D1c becomes a given range. For example, it is sufficient to adjust the stacking state of the first optical stack 10 and the second optical stack 30, or to adjust the peeling force of the adhesive layer 22, etc.

[0164] As shown by arrow γ2, when the management method is applied to the peeling member 6 at the rear stage of the peeling roller 46, as shown in FIG. Figure 14 As shown, the management method is implemented with the resin film 31 of the peeling member 6 as the first component layer 102 and the second phase difference layer 33 of the peeling member 6 as the second component layer 104. In this case, the end 31a of the resin film 31 corresponds to the end 102a, and the end 33a of the second phase difference layer 33 of the peeling member 6 corresponds to the end 104a. Furthermore, the distance D1d in the x-direction between the end 31a and the end 33a corresponds to the distance D1. The management method for the peeling member 6 is the same as the management method for the phase difference plate 2, except that the first component layer 102 and the second component layer 104 are the resin film 31 and the second phase difference layer 33 of the peeling member 6.

[0165] (Variation 3)

[0166] Instead of the first optical layered body 10 and the second optical layered body 30, it is also possible to use Figure 15 The first optical stack 10A and the second optical stack 30A are shown. The difference in structure between the first optical stack 10A and the first optical stack 10 is that the first phase difference layer 13 does not cover the two end portions of the orientation film 12 in the x direction. Similarly, the difference in structure between the second optical stack 30A and the second optical stack 30 is that the second phase difference layer 33 does not cover the two end portions of the orientation film 32 in the x direction. Usually, the length of the first phase difference layer 13 in the x direction is shorter than the length of the orientation film 12, and the length of the second phase difference layer 33 in the x direction is shorter than the length of the orientation film 32. In this case, Figure 9 In the peeling roller 46 shown, Figure 16As shown, the resin film 31 of the second optical laminate 30A is selectively peeled off. As a result, a phase difference plate 2A can be manufactured in which the orientation film 12, the first phase difference layer 13, the adhesive layer 22, the second phase difference layer 33 and the orientation film 32 are sequentially stacked on the resin film 11. Figures 6 to 9 Therefore, in the case of the modification 3, the same effects as those in the case of manufacturing the phase difference plate 2 are achieved.

[0167] While the embodiments and modifications of the present invention have been described above, the present invention is not limited to the illustrated embodiments and modifications, but is intended to encompass the scope of the claims and all modifications within the scope and meaning equivalent to the claims.

[0168] In the case where the optical component is a phase difference plate, the manufacture method of the phase difference plate to which the management method is applied is described. However, the optical component applying the manufacture method according to the present invention is not limited to phase difference plate. As other examples of optical components, for example, a polarizing plate obtained by stacking a polarizing film (polarizer layer) and a protective film, a circular polarizing plate (including an elliptical polarizing plate) obtained by bonding phase difference plate and polarizer to each other by an adhesive layer can be cited. The example of the above-mentioned polarizer layer is a PVA layer.

[0169] When the optical component is the circular polarizing plate, for example, the first member layer (e.g., corresponding to the phase difference plate or polarizing plate) may be formed. Figure 5 The above management method is applied by using the coating layer of the adhesive layer between the phase difference plate and the polarizing plate as the second component layer. Alternatively, as described in the above modification 1, the above management method can also be applied to the position adjustment of the phase difference plate and the polarizing plate.

[0170] The management method according to the present invention can be applied to a laminate comprising a resin film (first component layer) and a coating layer (second component layer). For example, the management method according to the present invention can be applied to a laminate comprising a polarizing film or a polarizing plate (first component layer) comprising a polarizing film and a coating layer (second component layer). The management method according to the present invention can also be applied, for example, to a case where the coating layer (second component layer) is formed directly on the resin film (first component layer).

[0171] The management method according to the present invention can also be applied to the case where the adhesive layer formed on the release film is transferred to the first component layer (such as a resin film). In this case, a release film with an adhesive layer is bonded to the first component layer via the adhesive layer to obtain an adhesive body. The release film can be peeled off from the adhesive body, and the adhesive layer can be laminated on the first component layer to obtain a laminate. In this case, the management method can be applied to the above-mentioned laminate as long as the adhesive layer is used as the second component layer. For example, in the case where the above-mentioned adhesive body is a long strip, it is only necessary to use the adhesive body while conveying the adhesive body in the long side direction. Figure 9 The management method can be applied to the laminate obtained by peeling the release film using the peeling roller 46. In this way, it can be determined whether the transfer of the first member layer to the adhesive layer is appropriate.

[0172] Alternatively, the management method of the present invention can also be applied to the case where an adhesive layer (second component layer) and a protective film (or release film) are laminated on a substrate (first component layer), or when the protective film is peeled off. For example, in this case, when the laminated component of the substrate, adhesive layer, and protective film is a long strip, as long as Figure 9 The protective film is peeled off by the peeling roller 46 in the process, and the management method is implemented for the laminated body of the obtained base material and the adhesive layer. Thus, it is possible to determine whether the protective film is properly peeled off (whether the adhesive layer remains on the protective film side).

[0173] Furthermore, the management method according to the present invention can be applied to a laminate having other optical functional films such as a polarizing film in addition to the substrate (first member layer) and the adhesive layer (second member layer).

[0174] As described in Modification 1 of the second embodiment, the management method according to the present invention can also be applied to management of the presence or absence of abnormality in the alignment of the first and second member layers in a stack of the first and second member layers.

Claims

1. A method for measuring an edge region of a laminate comprising a first component layer and a second component layer, wherein: The first member layer has a first end portion, The second member layer has a second end portion located on the same side as the first end portion when viewed in a stacking direction of the first member layer and the second member layer in the stacked body. The end region is a region of the laminate extending from the first end to the second end. The measuring method has the following features: an irradiation step of irradiating the end region with inspection light; a detecting step of detecting reflected light as the inspection light reflected by the end region; and a calculation step of calculating the distance between the first end and the second end based on the detection result of the reflected light, The inspection light has a stripe pattern in which light portions and dark portions are alternately arranged. The laminate is a long laminate. The irradiation step and the detection step are performed while the stacked body is conveyed in the longitudinal direction by conveying rollers. In the irradiation step, the inspection light is irradiated onto the stacked body on the conveying roller. The surface of the conveying roller irradiated with the inspection light is a mirror surface.

2. The assay method according to claim 1, wherein The first member layer is a resin film layer, and the second member layer is a coating layer containing a binder or an adhesive.

3. The measuring method according to claim 1 or 2, wherein The shape of the stripe pattern varies periodically.

4. The measuring method according to claim 3, wherein The shape of the stripe pattern changes periodically between the first pattern and the second pattern. The extending directions of the bright portion and the dark portion in the second pattern are orthogonal to the extending directions of the bright portion and the dark portion in the first pattern.

5. A method for managing an end region of a laminate comprising a first component layer and a second component layer, wherein: The first member layer has a first end portion, The second member layer has a second end portion located on the same side as the first end portion when viewed in a stacking direction of the first member layer and the second member layer in the stacked body. The end region is a region of the laminate extending from the first end to the second end. The management method has the following features: an irradiation step of irradiating the end region with inspection light; a detecting step of detecting reflected light as the inspection light reflected by the end region; a calculating step of calculating a distance between the first end and the second end based on a detection result of the reflected light; and A determination step is performed to determine whether the calculated distance is within a given range. The inspection light has a stripe pattern in which light portions and dark portions are alternately arranged. The laminate is a long laminate. The irradiation step and the detection step are performed while the stacked body is conveyed in the longitudinal direction by conveying rollers. In the irradiation step, the inspection light is irradiated onto the stacked body on the conveying roller. The surface of the conveying roller irradiated with the inspection light is a mirror surface.

6. The management method according to claim 5, wherein: The first member layer is a resin film layer, and the second member layer is a coating layer containing a binder or an adhesive.

7. The management method according to claim 5 or 6, wherein: The shape of the stripe pattern varies periodically.

8. The management method according to claim 7, wherein: The shape of the stripe pattern changes periodically between the first pattern and the second pattern. The extending directions of the bright portion and the dark portion in the second pattern are orthogonal to the extending directions of the bright portion and the dark portion in the first pattern.

9. The management method according to claim 5 or 6, wherein: The method further includes, before the irradiation step, a lamination step of laminating the second member layer on a laminated member having the first member layer or on the first member layer.

10. The management method according to claim 9, wherein: In the lamination step, the second member layer is laminated on the first member layer by applying a coating material on the first member layer.

11. The management method according to claim 10, wherein: When the calculated distance is not included in a predetermined range, the lamination step further includes a step of changing the coating area of ​​the coating material. The stacking step, the irradiation step, the detection step, and the determination step are repeated until the calculated distance falls within a predetermined range.

12. A method for manufacturing an optical component, comprising the management method according to any one of claims 5 to 11.

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