JP2016164618A - Transfer film, roll body of transfer film, optical film, roll body of optical film, image display device, production method of transfer film, and production method of optical film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire grid polarizer that can be made thinner compared to conventional ones and maintain sufficient mechanical strength.SOLUTION: A transfer film 9 includes, on a transfer layer 4, a polarizer layer 10 that limits transmission of incident electromagnetic waves depending on polarization planes, and the transfer film comprises a support body 15 and the transfer layer 4 laminated as peelable on the support body 15. On the transfer layer 4, a plurality of recessed grooves are fabricated by use of a molding resin material, with a pitch and a groove width less than the shortest wavelength of a wavelength band where transmission is to be limited; and a metal material is disposed in the recessed grooves to form metal wires 11 having a pitch and a line width less than the shortest wavelength of the wavelength band where transmission is to be limited.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a wire grid polarizer.

  Conventionally, in image display devices and the like, various configurations using a polarizer have been proposed. That is, for example, in a liquid crystal display device, a liquid crystal cell is formed by sandwiching a liquid crystal material with a glass plate on which a transparent electrode is arranged, and a linear polarizing plate is arranged on both sides of the liquid crystal cell to constitute a liquid crystal display panel. In recent years, a device has been devised in which a reflective linear polarizing plate is arranged on the incident surface (backlight side surface) of the liquid crystal display panel to improve the use efficiency of illumination light by the backlight.

  In addition, the image display device has been devised to prevent reflection of extraneous light by arranging a circularly polarizing plate formed by laminating a linearly polarizing plate and a quarter-wave plate on the panel surface of the image display panel.

  As such a polarizer, a configuration (so-called sheet polarizer), a wire grid type polarizer, and the like, which are made by impregnating polyvinyl alcohol (PVA) with iodine or the like and then stretching, are used. Patent Documents 1 and 2 propose a device relating to a wire grid polarizer.

  By the way, in recent years, image display devices have been made thinner, and accordingly, it is required to make the polarizers used in the image display devices thinner. In addition, in a small image display device, mechanical strength is required by carrying it around, and therefore, in a polarizer used in a small image display device, a machine having impact resistance, abrasion resistance, etc. It is required to ensure sufficient strength.

  However, in such a polarizer, the sheet polarizer has poor heat resistance and further has a drawback that it is difficult to reduce the thickness. Accordingly, it is conceivable to use a wire grid type polarizer instead of the sheet polarizer. However, although the conventional wire grid polarizer can be made thin in principle, it has a problem that it is difficult to reduce the thickness and to secure sufficient mechanical strength. .

JP 2006-330521 A JP 2012-27221 A

  This invention is made | formed in view of such a condition, About wire grid type polarizer, thickness can be made thin compared with the former, and also sufficient mechanical strength can be ensured. The purpose is to do.

  In order to solve the above-mentioned problems, the present inventor has made extensive studies and arranged a metal material in the concave groove on the surface of the transparent resin layer so that the transparent resin layer can be transferred to another member as a transfer layer. The present invention has been completed.

    Specifically, the present invention provides the following.

(1) A transfer film including a transfer layer having a polarizer layer that restricts transmission of incident electromagnetic waves according to a polarization plane,
Comprising a support and a transfer layer releasably laminated on the support,
In the transfer layer,
A plurality of concave grooves with pitches and groove widths less than the shortest wavelength of the wavelength band that restricts transmission by the shaping resin material are produced,
A transfer film in which a metal material is disposed in the concave groove to form a metal linear portion having a pitch and a line width less than the shortest wavelength in a wavelength band that restricts transmission.

  According to (1), by arranging a metal material in the concave groove to produce the metal wire portion, damage to the metal wire portion can be reduced as compared with the conventional case. In comparison, the mechanical strength can be improved. Further, since the transfer layer is made of the shaping resin formed from the metal linear portion, the entire thickness can be reduced by applying the transfer method.

(2) In (1),
The transfer layer is
A transfer film having a thickness of 20 μm or less and 0.2 μm or more.

  According to (2), the overall thickness can be reduced by a more specific configuration.

(3) In (1) or (2),
The metal linear part is:
A transfer film in which a low-reflective layer having a lower reflectance than other portions is formed on the bottom surface side of the concave groove and / or on the side opposite to the bottom surface side.

  According to (3), for example, it can be arranged on an image display panel to prevent a decrease in contrast and sharpness of the display screen due to reflection of extraneous light.

(4) In a winding body of a transfer film obtained by winding a transfer film in the form of a long film,
On the support substrate, a transfer layer including a polarizer layer that restricts transmission of incident electromagnetic waves according to the polarization plane,
In the transfer layer,
A plurality of concave grooves with a pitch and a groove width less than the shortest wavelength of the wavelength band for limiting transmission by the shaping resin material are produced so as to extend in the longitudinal direction of the support substrate,
A winding body of a transfer film in which a metal material is disposed in the concave groove, and a metal linear portion having a pitch and a line width less than the shortest wavelength in a wavelength band that restricts transmission is produced.

  According to (4), by arranging a metal material in the concave groove to produce the metal wire portion, damage to the metal wire portion can be reduced as compared with the conventional case. In comparison, the mechanical strength can be improved. Further, since the shaping resin layer side formed with the metal linear portion is provided in the transfer layer, the entire thickness can be reduced by applying the transfer method. In addition, since the shaping resin layer provided with the metal linear portion is provided in the transfer layer in this manner, various arrangements are made for the arrangement of the metal linear portion in the transfer layer, and the portion functioning as the polarizer is located at the interface. It is possible to reduce the influence as much as possible to protect the concave groove and to obtain further mechanical strength. Further, since the concave groove is formed in a direction extending in the longitudinal direction of the support base material, the transmission axis direction can be set in the width direction of the support base material. For example, a linear polarizer using a sheet polarizer Can be executed simply and efficiently.

(5) In (4),
The transfer layer is
A transfer film roll having a thickness of 20 μm or less and 0.2 μm or more.

  According to (5), the overall thickness can be reduced by a more specific configuration.

(6) In (4) or (5),
The metal linear part is:
A winding body of a transfer film in which a low reflection layer having a lower reflectance than other portions is formed on the bottom surface side of the concave groove and / or on the side opposite to the bottom surface side.

  According to (6), for example, the display screen can be arranged on the image display panel to prevent a decrease in contrast and sharpness of the display screen due to reflection of external light.

(7) Provided with an optical functional layer responsible for a desired optical function,
An optical film in which the transfer layer of the transfer film according to any one of (1), (2), and (3) is laminated on the optical functional layer.

  According to (7), when laminated with a linearly polarizing plate, a quarter-wave plate, or a retardation film for optical compensation, the thickness can be reduced as compared with the prior art, and a sufficient machine Strength can be ensured.

(8) In a wound body of an optical film obtained by winding an optical film in the form of a long film,
An optical film winding body in which an optical functional layer having a desired optical function and a transfer layer of the transfer film according to any one of (4), (5), and (6) are laminated.

  According to (8), when laminating with a winding body such as a linear polarizing plate wound up in a roll shape, a quarter wavelength plate, or a retardation film for optical compensation, the laminating process is simplified, The thickness can be reduced as compared with the conventional case, and further sufficient mechanical strength can be secured.

  (9) An image display device in which the transfer layer of the transfer film according to any one of (1), (2), and (3) is disposed on an image display panel.

  According to (9), the present invention can be applied to an image display device provided with an antireflection film by the function of a circularly polarizing plate, an image display device using a liquid crystal display panel, etc. Sufficient mechanical strength can be ensured.

  (10) An image display device in which the optical film of (7) is disposed on an image display panel.

  According to (10), the present invention can be applied to an image display device provided with an antireflection film by the function of a circularly polarizing plate, an image display device using a liquid crystal display panel, etc. Sufficient mechanical strength can be ensured.

(11) A transfer layer preparation step of preparing a transfer layer on a support substrate,
The transfer layer preparation step includes
A moldable resin layer is prepared on the support substrate and subjected to a mold treatment, and a plurality of concave grooves are formed on the surface of the moldable resin layer with pitches and groove widths less than the shortest wavelength of the wavelength band for limiting transmission. Concave and convex shape manufacturing process,
A method for producing a transfer film, comprising: arranging a metal material in the concave groove to produce a metal linear part with a pitch and a line width less than the shortest wavelength in a wavelength band for limiting transmission.

  According to (11), by arranging the metal material in the concave groove to produce the metal wire portion, damage to the metal wire portion can be reduced as compared with the conventional case. And mechanical strength can be improved. In addition, since the shaping resin layer formed from the metal linear portion is a transfer layer, the entire thickness can be reduced by applying a transfer method.

(12) The support substrate is in the form of a long film,
The uneven shape manufacturing step includes
A method for producing a transfer film, wherein the concave groove is produced in a direction extending in the longitudinal direction of the support substrate.

  According to (12), since the concave groove is formed in a direction extending in the longitudinal direction of the support substrate, the transmission axis direction can be set in the width direction of the support substrate. -A lamination process with a linear polarizer using a polarizer can be performed simply and efficiently.

(13) a transfer layer preparation step of preparing a transfer layer on a support substrate;
A transfer step of transferring the transfer layer to another member,
The transfer layer preparation step includes
A moldable resin layer is prepared on the support substrate and subjected to a mold treatment, and a plurality of concave grooves are formed on the surface of the moldable resin layer with pitches and groove widths less than the shortest wavelength of the wavelength band for limiting transmission. Concave and convex shape manufacturing process,
A method for producing an optical film, comprising: arranging a metal material in the concave groove to produce a metal linear part having a pitch and a line width less than the shortest wavelength in a wavelength band for limiting transmission.

  According to (13), by arranging a metal material in the concave groove to produce the metal wire portion, damage to the metal wire portion can be reduced as compared with the conventional case. And mechanical strength can be improved. Further, since the shaping resin layer formed by forming the metal linear portion is a transfer layer, the entire thickness can be reduced.

(14) In (13),
The support substrate is in the form of a long film,
The uneven shape manufacturing step includes
The manufacturing method of the optical film which produces the said concave groove with the direction extended in the longitudinal direction of the said support body base material.

  According to (14), by forming the concave groove in a direction extending in the longitudinal direction of the support substrate, the transmission axis direction can be set in the width direction of the support substrate. A lamination process with a linear polarizing plate or the like by a polarizer can be performed simply and efficiently.

  According to the present invention, it is possible to reduce the thickness of the wire grid type polarizer as compared with the related art and to secure a sufficient mechanical strength.

It is sectional drawing which shows the image display apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows the structure of the transfer film which concerns on the image display apparatus of FIG. It is a figure which shows the cross-sectional shape of the polarizer layer of the transfer film of FIG. It is a flowchart which shows the manufacturing process of a transfer film. It is a figure where it uses for description of each process of FIG. It is a figure where it uses for description of a lamination process with a linearly-polarizing plate. It is a figure where it uses for description of a roll version. It is sectional drawing which shows the image display apparatus which concerns on 2nd Embodiment of this invention. It is a figure which shows the structure of the polarizer layer which concerns on the image display apparatus of FIG. It is sectional drawing which shows the image display apparatus which concerns on 3rd Embodiment of this invention. It is sectional drawing which shows the image display apparatus which concerns on 4th Embodiment of this invention. It is a figure where it uses for description of the manufacturing method of the roll plate which concerns on 5th Embodiment of this invention.

[First Embodiment]
[Image display device]
FIG. 1 is a sectional view showing an image display apparatus according to the first embodiment of the present invention. The image display device 1 is a liquid crystal display device, and a backlight 3 is disposed on the back surface of the liquid crystal display panel 2. Here, as the backlight 3, various surface light source devices such as an edge light type and a direct light type can be widely applied. The liquid crystal display panel 2 is configured by sandwiching a liquid crystal cell 5 between linear polarizing plates 6 and 7 having a crossed Nicol arrangement or a parallel Nicol arrangement, and the liquid crystal cell 5 includes a liquid crystal layer made of a liquid crystal material by a glass substrate on which a transparent electrode is formed. It is formed by pinching. As a result, the image display device 1 modulates the intensity of the transmitted light in units of pixels by the voltage applied to the transparent electrode provided in the liquid crystal cell 5 and outputs it, thereby displaying a desired image.

  In this image display device 1, a transfer layer 4 having an optical functional layer functioning as a polarizer (hereinafter referred to as a polarizer layer) is attached to a linear polarizing plate 4 on the backlight 3 side of a liquid crystal display panel 2. Placed. The linear polarizing plates 6 and 7 are so-called sheet polarizer type polarizing plates, and after impregnating polyvinyl alcohol (PVA) with iodine or the like, the linear polarizing plates are stretched to form an optical functional layer that bears the optical function as a polarizer. The optical functional layer is produced by being sandwiched between protective substrates.

  The transfer layer 4 is a layer disposed by a transfer method. In this embodiment, the transfer layer 4 is a shaping resin layer provided with a polarizer layer as described later. The transfer method refers to, for example, when a desired layer is formed on a substrate, this layer is not directly formed on the substrate but can be peeled once on a support having releasability. After producing the transfer body by laminating the layers, according to the process, demand, etc., the layer formed on the support is finally placed on the substrate (transferred substrate) on which the layer is to be laminated. In this method, a desired layer is formed on the substrate by peeling and removing the support.

  The polarizer layer provided in the transfer layer 4 is an optical functional layer that functions as a wire grid polarizer, and is a so-called reflective polarizer that selectively reflects incident light from a polarization plane orthogonal to the transmission axis direction. It is. The transfer layer 4 is arranged so that the transmission axis direction of the linearly polarizing plate 7 arranged on the incident surface side (backlight 3 side) of the liquid crystal cell 5 coincides with the transmission axis direction of the polarizer layer. The image display device 1 improves the utilization efficiency of the illumination light from the backlight 3. In this embodiment, the transfer layer 4 is integrated with the linear polarizing plate 7 in advance, and then provided to the manufacturing process of the liquid crystal display panel 2, whereby the image display device 1 simplifies the assembly work. Can do. Further, by applying the transfer method, a support necessary for handling the wire grid type polarizer is finally unnecessary, so that the thickness of the image display device 1 can be reduced.

  This integration is performed by bonding the transfer layer 4 and the linear polarizing plate 7 together with an adhesive such as an ultraviolet curable resin.

[Transfer film]
FIG. 2 is a diagram showing a configuration of a transfer film used for disposing the transfer layer 4. The transfer film 9 is formed by forming a transfer layer 4 of a shaping resin layer on a support base material 15 and attaching the transfer layer 4 to the linear polarizing plate 7 with an adhesive such as an ultraviolet curable resin. The transfer layer 4 is disposed on the linearly polarizing plate 7 by peeling the material 15. In the transfer film 9, a polarizer layer 10 having an optical function as a polarizer is provided on the surface side of the transfer layer 4. As a result, the portion of the transfer layer 4 on the side of the support substrate 15 where the polarizer layer 10 is not provided constitutes a support layer that functions as a support for the polarizer layer 10 and protects the polarizer layer 10. A protective layer is formed.

  Here, the polarizer layer 10 has an optical function as a polarizer that restricts transmission of incident light, which is an incident electromagnetic wave, according to the polarization plane, and the metal linear portion 11 is separated in the line width direction. Several are arranged. Here, the metal linear portion 11 is formed of a metal material with a line width Wm less than the shortest wavelength λmin in the wavelength band of the electromagnetic wave that restricts transmission. Further, the metal linear portions 11 are repeatedly arranged regularly or irregularly by the pitch P less than the shortest wavelength λmin. As a result, the interval Wt between adjacent metal linear portions 11 (the width of a transparent solid dielectric portion 12 described later) has a duty ratio D (= Wm / P = Wm / (Wm + Wt)) of 0.2 or more. It is made to be 0.8 or less, preferably 0.3 or more and 0.7 or less. Since the surface of the polarizer layer 10 may have a curved surface shape, the line width Wm is a width viewed from a direction orthogonal to the extending direction of the metal linear portion 11 and the repeating direction of the metal linear portion 11. Defined by Note that, when the shortest wavelength λmin is applied to the image display device as in this embodiment and its transmission is limited with respect to the entire wavelength band of the visible light region, the shortest wavelength λmin may be less than 380 nm. For example, in the case of limiting the transmission of ultraviolet rays used for exposure by applying to an exposure apparatus using ultraviolet rays, a wavelength different from 380 nm is appropriately applied.

  The metal linear portion 11 is formed so that the thickness H is equal to or less than λmin with respect to the shortest wavelength λmin. In this embodiment, the metal linear portion 11 is formed in a substantially rectangular shape in cross section. Accordingly, the polarizer layer 10 is configured to function as a wire grid polarizer. In the polarizer layer 10, for example, in the visible light wavelength band, a plurality of wavelengths such as the shortest wavelength 380 nm, the center wavelength 550 nm, and the longest wavelength 780 nm are set as the design reference wavelengths, and desired optical characteristics at these design reference wavelengths ( For example, based on the refractive index n and the extinction coefficient k of the metal material and the transparent dielectric material, P wave transmission corresponding to the pitch P, the line width Wm, and the thickness H is obtained by simulation. By calculating the ratio, the S wave transmittance, the S wave reflectance, and the extinction ratio, suitable values for the necessary pitch P, line width Wm, and thickness H are derived. Thereby, for example, when a sufficient extinction ratio is ensured at a wavelength of 550 nm, when a general ultraviolet curable resin (n = 1.5, k = 0 at 550 nm) is used for the metal layer and the transparent dielectric, The pitch P is 75 nm or more and 175 nm or less, preferably 100 nm or more and 150 nm or less. The thickness is 90 nm to 200 nm, preferably 110 nm to 160 nm, and more preferably 120 nm to 150 nm.

Further, the polarizer layer 10 is provided with a transparent solid dielectric portion 12 made of a solid dielectric transparent to an electromagnetic wave in a wavelength band for limiting transmission between adjacent metal linear portions 11. Thus, by providing the transparent solid dielectric portion 12 between the adjacent metal linear portions 11, the polarizer layer 10 can reduce damage to the metal linear portions 11 due to contact of various members, Abrasion resistance can be improved and mechanical strength can be improved as compared with the prior art. Moreover, the structure which provided the transparent solid dielectric material part 12 between the metal linear parts 11 which adjoined in this way produced the uneven | corrugated shape by the concave groove | channel corresponding to the metal linear part 11 in the shaping resin layer (4). Thereafter, the concave groove can be filled with a material related to the metal linear portion 11, whereby a large-area transfer film can be efficiently produced, and mass productivity is improved as compared with the conventional case. be able to. Moreover, by being able to be manufactured in this manner, the manufacturing accuracy of the metal linear portion 11 can be improved, and as a result, the manufacturing accuracy of the polarizer layer 10 can also be improved. When the metal linear portion 11 is produced by filling, a functional layer for adhesion and surface protection may be provided on the concave groove as necessary. The functional layer is not particularly limited, but Si ₂ or SiC, which is mainly Si or a compound thereof, is preferably used. Moreover, you may make the shaping resin layer (4) itself contain an adhesive improvement component with a metal, not as a functional layer.

  Accordingly, in this embodiment, the mechanical strength can be significantly ensured with respect to the wire grid type polarizer as compared with the related art. In particular, in this embodiment, the polarizer layer 10 is formed on the surface of the shaping resin layer provided on the support substrate 15, so that the transfer layer 4 is linearly polarizing plate with the metal linear portion 11 inside. 7, which can sufficiently prevent the metal linear portion 11 from being damaged and ensure the mechanical strength. Further, in the case where only the transfer layer 4 is transferred in this way, it is sufficient to produce the transfer layer 4 with a thickness that can produce a concave groove, and thus the overall thickness can be reduced.

  Here, as shown in the cross-sectional shape in the line width direction in FIG. 3, the metal linear portion 11 may protrude from the concave groove with one end surface thereof being a flat surface, and the transparent solid dielectric portion. 12 may be flat (FIG. 3A), or may have a shape deeper than the surface of the transparent solid dielectric portion 12. Further, it may be produced by a curved shape in which the central portion in the line width direction protrudes (FIG. 3B), or may be produced by a curved shape opposite to this. Further, as shown in FIG. 3C, the adjacent metal wire portions 11 are connected by the material of the metal wire portions 11, and the thickness d of the connected portions is a wavelength band for limiting transmission. In this case, the adjacent metal wire portions 11 may be connected entirely or partially by the material of the metal wire portions 11. Further, as shown in FIG. 3D, an overcoat layer 12A made of a transparent resin may be provided to protect the metal layer before transfer.

[Detailed configuration of each part]
Here, as the metal material related to the metal linear portion 11, for example, metals, alloys, metal compounds, and the like related to various conductors can be widely applied. However, any of these metals such as aluminum, nickel, chromium, and silver, whichever It is desirable to apply alloys of these metals and compounds of these metals. From the viewpoint of efficiently reflecting electromagnetic waves that restrict transmission, it is desirable to use metals, alloys, and compounds having high reflectivity such as aluminum, nickel, and silver, and aluminum is particularly preferable for visible light. On the other hand, from the viewpoint of suppressing the reflection of electromagnetic waves that limit transmission, it is desirable to apply a metal, alloy, or compound having a low reflectance such as chromium.

  The metal linear portion 11 may be formed by a plurality of layer structures. By making such a layer structure, for example, it is possible to change the characteristics with respect to incident light incident from both surfaces of the polarizer layer 10 and to change the hue of both surfaces of the polarizer layer 10.

  The transfer film 9 (FIG. 2) is provided with a shaping resin layer (4) on a support substrate 15 made of a transparent film material, and a fine uneven shape is produced by the shaping treatment of the shaping resin layer (4). Thus, the transparent solid dielectric portion 12 is produced. Further, a metal layer is formed on the surface on which the fine concavo-convex shape is formed by vapor deposition, sputtering, electrolytic plating, electroless plating, etc., and the metal linear portion 11 is manufactured. Thereafter, the metal film on the end surface of the transparent solid dielectric portion 12 between the metal linear portions is removed from the transfer film 9 so that the end surface of the transparent solid dielectric portion 12 is exposed by processes such as etching, cutting, and polishing. Is done. If necessary, after removing the metal layer, the metal material is selectively deposited on the metal material remaining in the concave groove. Here, the filling of the metal into the concave groove may be performed in a plurality of times because, for example, a single treatment may be insufficient. In addition, for example, in the case of filling a metal in a high-aspect concave groove or the like, there is a case where the entrance may be blocked in the middle when filling the metal. In such a case, the metal that closes the entrance is once removed. Thereafter, the filling process may be executed again. A thin layer such as an oxide film may be present between the metal layers filled in each filling step in this way.

  In the production of the metal linear portion 11, chemical vapor deposition, atomic layer deposition, oxidation-reduction reaction, nanoparticle deposition, or the like can be applied. Here, the oxidation-reduction reaction method means a metal layer preparation method in which a metal layer is prepared by reducing an oxidized metal material with a reducing agent, and is, for example, a metal layer preparation method represented by a silver mirror reaction. Here, the reducing agent may be included in the transparent solid dielectric portion forming the uneven shape. In addition, the nanoparticle deposition method is a method in which a metal layer is produced by depositing nanoparticles such as aluminum on a concavo-convex surface, or a method in which a metal linear portion is produced by selectively depositing in a concave groove. Yes, if necessary, after depositing the nanoparticles, a step such as firing is provided to fix the deposited nanoparticles to the concave groove. An electroforming process can be applied to the selective deposition of the metal material on the metal material remaining in the concave groove after the metal layer is removed.

  As the support substrate 15, a substrate used for a general transfer film can be applied, but from the viewpoint of cleanliness, a substrate used for an optical film is preferable, and an ultraviolet curable resin is used for the shaping resin layer. When used, a base material that transmits UV rays well is preferable. Specifically, a COP (cycloolefin polymer) film, a TAC (triacetyl cellulose) film, a PET (polyester terephthalate) film, a polyimide film, and the like are applicable. However, when a wet process such as etching is applied in the manufacturing process, the TAC film is not preferable because the volume change due to water absorption is large. Also, from the viewpoint of mechanical strength and cost, a PET film is preferable, and a film that does not undergo easy adhesion treatment on the molding surface is more preferable.

  In the support base material 15, the adhesive strength between the support base material 15 and the transfer layer 4, which is the shaping resin layer, is reduced to the extent that the unintended peeling in the manufacturing process does not occur. You may make it provide the release layer which can peel favorably. For the release layer, for example, silicon resin (organosilicon-based polymer compound), fluorine-based resin, melamine resin, epoxy resin, or other resin and other appropriate resins (acrylic resin, cellulose-based resin, polyester resin, etc.) A mixture with can be applied.

  Although various curable resins that can be subjected to a shaping process can be applied to the shaping resin layer according to the transfer layer 4, an ultraviolet curable resin is applied in this embodiment. As a result, the transfer layer 4 is provided between the support substrate 15 and the polarizer layer 10 with a transparent layer that is transparent to electromagnetic waves in a wavelength band that restricts transmission by the remainder of the shaping resin layer. As described above, this transparent layer functions as a protective layer for the polarizer layer 10.

  In addition, while forming a hard-coat layer etc. in the support base material 15 and transferring this hard-coat layer etc. integrally with a shaping resin layer, this hard-coat layer etc. are also included in the transfer layer 4, and polarized light The protective layer of the child layer 10 may be used. Needless to say, such a protective layer may be prepared after the transfer layer 4 is disposed on the transfer substrate.

  Although the transfer layer 4 functions as a support and a protective layer for the polarizer layer 10 except for the polarizer layer 10, when the thickness is increased, the thickness of the image display device 1 is increased. However, it is necessary to have a thickness that can be subjected to a shaping process and can be transferred. Thereby, the transfer layer 4 is produced with a thickness of 10 μm or less and 0.2 μm or more, preferably 5 μm or less and 1 μm or more.

  Moreover, if the peeling force between the shaping resin layer and the support substrate 15 is too light, the transfer film 9 is liable to cause defects due to unnecessary peeling, and if it is too heavy, the workability is lowered. Specifically, for example, when the peeling speed is 300 mm / min and the width is reduced to about 0.125 N / 50 mm width (180 degree peeling), the risk of unnecessary peeling increases. If it is about 0.19 N / 50 mm width (180 degree peeling), it can be used as a transfer film. However, when it is actually used as a product, the peeling weight at high speed becomes important, and it is still insufficient. It is. However, when the peeling speed is 10 m / min and the width is 0.28 N / 50 mm width or more and 0.36 N / 50 mm width or less (180-degree peeling), the support substrate can be peeled stably. If it exceeds 0.40N / 50mm width (180 degree peeling), a large force is required to peel off the support substrate, but this is not very desirable. Also affected by. In any case, it is necessary to design the fracture strength and tensile modulus of the resin within the range where the molded resin layer breaks due to the stress applied to the peeling or does not break because the metal linear part cannot be stretched greatly. These can be adjusted by changing the resin skeleton, composition, curing conditions, and the like. These peel strengths are measured values with a test piece having a width of 50 mm.

〔Manufacturing process〕
FIG. 4 is a flowchart showing the manufacturing process of the transfer film 9. In this manufacturing process, the support substrate 15 is provided in the form of a transparent long film wound up on a roll. In this manufacturing process, a concavo-convex shape is formed on the surface of the support base material 15 by the concavo-convex shape preparation step SP2 while the support base material 15 is pulled out and conveyed from the roll.

  More specifically, in this uneven shape manufacturing step, as shown in FIG. 5A, first, after applying a coating liquid of an ultraviolet curable resin to the support base material 15, fine unevenness on the peripheral side surface. While pressing and conveying the support base material 15 to the peripheral side surface of the roll plate which is a shaping mold whose shape has been produced, the ultraviolet curable resin is cured by irradiating ultraviolet rays, and then the cured ultraviolet rays The curable resin is peeled off from the roll plate integrally with the support substrate 15. As a result, as shown in FIG. 5B, in this step, the fine uneven shape formed on the peripheral side surface of the roll plate is transferred to correspond to the metal linear portion 11 on the surface of the support substrate 15. The shaping resin layer (4) formed by producing the concave groove 21 is produced. Accordingly, the concave groove 21 corresponds to the groove width corresponding to the line width Wm of the metal linear portion 11 and less than the shortest wavelength of the wavelength band for limiting transmission, and also corresponds to the repetition pitch P of the metal linear portion 11. It is produced by the pitch.

  Then, the manufacturing process of a transfer film forms the metal linear part 11 by arrange | positioning a metal material in the concave groove 21 in metal linear part preparation process SP3. More specifically, in this embodiment, as shown in FIG. 5C, a metal layer is formed on the entire surface of the concavo-convex shape formed by the concave grooves 21 by vapor deposition, sputtering, electrolytic plating, electroless plating, or the like. 22 is produced, and the metal linear part 11 is produced.

  Subsequently, in this manufacturing process, an extra metal layer is deleted by etching, polishing, cutting, or the like in the metal removing process SP4 as shown in FIG. More specifically, when the metal layer is removed by etching, for example, when the metal layer is removed by etching, the protrusion of the end face of the metal linear portion 11 is controlled by controlling the type, concentration, temperature, and etching time of the chemical solution used for etching. The degree can be adjusted. For example, when the metal layer is removed by polishing, the end surface of the metal linear portion 11 is controlled by controlling the polishing agent used for polishing, the temperature of the polishing solution by the polishing agent, the concentration of the chemical solution added to the polishing solution, the pressing force, and the like. The degree of protrusion can be adjusted. Further, the metal removal step SP4 is performed by combining etching, polishing, cutting, and the like as necessary, as in the case of processing the end face by etching after cutting, for example. In addition, after removing the metal layer between the concave grooves in this way, a process of selectively depositing a metal material on the metal material remaining in the concave grooves as necessary, or a metal linear portion creating step SP3 and a metal removing step The processing of SP4 is repeatedly executed.

  Instead of the metal removal step SP4 or in addition to the metal removal step SP4, a step of making the surface of the metal layer transparent may be provided. The transparency here is a treatment for making the surface of the metal layer transparent with respect to electromagnetic waves in the corresponding wavelength band. For example, by oxidizing the surface of the metal layer with aluminum, the aluminum on the surface of the metal layer is converted into aluminum oxide. It is executed by changing the quality. In addition, you may make it function the transparent layer produced in this way as a protective layer of a polarizer layer.

  In this embodiment, these steps SP2 to SP4 are sequentially performed while transporting the support base material 15, and then wound onto a roll to produce a transfer film winder, followed by the transfer film winder. It is conveyed to the processing process.

  In this way, after forming a concavo-convex shape formed by arranging a plurality of concave grooves with a groove width of less than the shortest wavelength, the transfer film is transparent solid between adjacent metal linear portions by forming a metal linear portion. It can be set as the structure provided with the dielectric material part, and, thereby, abrasion resistance can be improved compared with the conventional wire grid structure. Further, mass productivity and production accuracy can be improved. Furthermore, by forming the overcoat layer so as to cover the entire surface of the metal linear portion, it is possible to improve the scratch resistance and durability in the state of the transfer film.

  Further, by removing the metal layer relating to the transparent solid dielectric portion after the metal layer is entirely formed, a large-area transfer film can be mass-produced efficiently, and the mass productivity can be further improved. Moreover, by producing a concavo-convex shape formed by arranging a plurality of concave grooves by a shaping process, a large-area transfer film can be mass-produced efficiently, and the mass productivity can be further improved.

  FIG. 6 is a diagram for explaining an integration process with the linearly polarizing plate 7. In the integration step, the linearly polarizing plate 7 and the transfer film 9 are provided by the linearly polarizing plate winding body 35 and the transfer film winding body 36 which are each in the form of a long film wound around a roll. In the integration step, an adhesive such as an ultraviolet curable resin is applied by a coating apparatus (not shown) while the transfer film 9 is pulled out from the transfer film winding body 36 and conveyed. Further, after the linearly polarizing plate 7 is pulled out from the linearly polarizing plate winding body 35 and laminated with the transfer film 9, ultraviolet rays are irradiated as shown by arrows to integrate the linearly polarizing plate 7 and the transfer film 9, and then The support substrate 15 is peeled off and cut into a desired size by sheet cutting. In addition, the timing which peels the support body base material 15 can be arbitrarily designed in an actual assembly process. As the adhesive, a thermosetting type, a two-component curing type, or the like can be applied, or an adhesive material can be used.

  In this way, the linear polarizing plate 7 is a sheet polarizer type, and after impregnating polyvinyl alcohol with iodine or the like, it is stretched to produce an optical function that functions as a polarizer. In such a long film form, as shown by the arrow A1, the width direction perpendicular to the transport direction, which is the long direction, is made to be the transmission axis direction.

  On the other hand, in the transfer film 9 according to the wire grid type polarizer, the direction orthogonal to the extending direction of the metal linear portion 11 becomes the transmission axis direction, and according to the concave groove to be formed in the shaping resin layer from this. Furthermore, the direction of the transmission axis can be freely set according to the molding die used for producing the concave groove. In this embodiment, however, the polarizer layer 10 is integrated with the linearly polarizing plate 7 while being conveyed in the form of a long film as described above in the transmission axis direction of the linearly polarizing plate 7 as indicated by an arrow A2. The metal linear part 11 is produced so that it may extend in the elongate direction of the support base material 15 so that a permeation | transmission direction may correspond. Thereby, this manufacturing process can provide the polarizer layer 10 in the linearly polarizing plate 7 efficiently, and can improve productivity.

  When the transfer layer 4 is integrated with the linearly polarizing plate 7 as described above, the transfer layer 4 functions as a protective layer for the optical functional layer of the linearly polarizing plate 7. Thus, the transfer layer 4 may be directly laminated on the optical functional layer of the linear polarizing plate 7 so that the linear polarizing plate base on the polarizer layer 10 side may be omitted. In this way, the overall thickness can be further reduced.

[Roll version]
FIG. 7 is a diagram for explaining the roll plate. The roll plate 30 is a mold for molding having a fine uneven shape on the peripheral side surface, and a fine uneven shape by a ridge corresponding to the concave groove 21 is formed on the peripheral side surface. In this embodiment, the ridges are formed so as to extend in the circumferential direction, whereby the concave groove 21 is formed so as to extend in the longitudinal direction of the support base material 15 by shaping.

  In the roll plate 30, a base material 31 is formed in a cylindrical shape or a columnar shape made of a metal material that is easy to cut. In this embodiment, a copper pipe material is applied to the base material 31. In this smoothing process, after the peripheral side surface of the base material 31 is smoothed by cutting processing of the peripheral surface of the base material 31 using a cutting tool in the smoothing step, electrolysis is performed by a combination of an electrolytic elution action and a rubbing action by abrasive grains. The peripheral side surface of the base material 31 is made into a super mirror surface by a composite polishing method.

  Subsequently, in this cutting process, after the base material 31 is mounted on the cutting device in the cutting process, the tip of the cutting tool 32 is pressed against the peripheral side surface of the base material 31, and in this state, the base material 31 is moved as shown by an arrow B. While rotating, the cutting tool 32 is moved in the direction along the tube axis of the base material 31 as indicated by the arrow C, and the peripheral side surface of the base material 31 is cut into a spiral shape. Thereby, this manufacturing process produces the protruding item | line corresponding to the concave groove | channel 21 by the cross-sectional rectangular shape extended in the circumferential direction on the surrounding side surface of the base material 31. FIG. Note that the tip of the cutting tool 32 is formed in a comb-like shape so that a plurality of protrusions can be manufactured simultaneously and in parallel, thereby reducing the time required for manufacturing the roll plate in this step. Note that a seamless (seamless) roll plate as in this embodiment can be produced by a technique such as photolithography, but has a drawback that it is not suitable for widening. In contrast, the roll plate of this embodiment can be easily widened.

  In the extension direction of the ridges, the extension direction of the rotation shaft may be used as necessary, or may be inclined obliquely with respect to the rotation axis direction.

  According to the structure of this embodiment, it can arrange | position to the entrance plane side of a liquid crystal cell, can reduce the whole shape thinly, and can ensure sufficient mechanical strength.

[Second Embodiment]
FIG. 8 is a cross-sectional view showing an image display apparatus according to the second embodiment. The image display device 41 is configured in the same manner as the image display device 1 of the first embodiment except that a liquid crystal display panel 42 is disposed instead of the transfer layer 4 and the liquid crystal display panel 2. In the liquid crystal display panel 42, a liquid crystal cell is formed by sandwiching a liquid crystal layer 5C made of a liquid crystal material between glass substrates 5A and 5B on which transparent electrodes are formed, and the glass substrate 5A and 5B has an optical function serving as a linear polarizing plate. Transfer layers 43 and 44 each having a functional layer are disposed by a transfer method. One of the transfer layers 43 and 44 may be replaced with a linear polarizing plate. Further, the transfer layer 4 described in the first embodiment may be provided between the backlight 3 and the transfer layer 44, and a reflective linear polarizing plate used in a conventional liquid crystal display device may be provided. Also good.

  FIGS. 9A and 9B are views showing transfer films 52 and 51 used for transferring the transfer layers 43 and 44, respectively. In the transfer film 51, a low reflection layer 11 </ b> A having a lower reflectance than other portions is produced on the opposite side to the bottom surface side of the concave groove related to the metal linear portion 11, whereby the low reflection layer 11 </ b> A, the center The metal linear part 11 is produced by the two-layer structure of the material layer 11B. In addition, the transfer film 52 is formed with a low reflection layer 11A having a lower reflectance than other portions on the bottom surface side of the concave groove related to the metal linear portion 11 and the side surface opposite to the bottom surface side. Thus, the metal linear portion 11 is formed by a three-layer structure of the low reflection layer 11A, the central material layer 11B, and the low reflection layer 11A. The transfer films 51 and 52 are configured the same as the transfer film 9 except that the configuration related to the metal linear portion 11 is different. FIG. 9D shows an example in which an overcoat layer 12A made of a transparent resin is provided in comparison with FIG. 3D.

  That is, when the transfer layer 4 is arranged on the exit surface of the liquid crystal cell instead of the linear polarizing plate, extraneous light is reflected by the metal linear portion 11 in a state where no image is displayed, and the contrast and sharpness are lowered. I understood. Further, in this case, it was found that the contrast and the sharpness are also lowered by the light from the backlight that has been transmitted through the linear polarizing plate on the incident surface side of the liquid crystal cell being reflected by the transfer layer 4.

  Similarly, when the transfer layer 4 is disposed on the incident surface of the liquid crystal cell in place of the linear polarizing plate, extraneous light transmitted through the liquid crystal cell is reflected by the metal linear portion 11 provided in the transfer layer 4, and Even in this case, it was found that the contrast and the sharpness were lowered.

  However, according to this embodiment, in the transfer layer 43 disposed on the exit surface of the liquid crystal cell, the reflection from the polarizer layer is reduced by providing the low reflection layer 11A, and the contrast is increased. Therefore, it is possible to sufficiently reduce the decrease in sharpness. Further, in the transfer layer 44 arranged on the incident surface of the liquid crystal cell, the low reflection layer 11A is similarly provided, so that such antireflection is reduced, and deterioration of contrast and sharpness is prevented. Can do.

  Here, it is desirable that the low reflection layer 11 </ b> A has a black color tone as seen by visual observation, and is thus a blackened layer by applying the blackening process disclosed in JP 2012-208145 A or the like. Is desirable. In the case where the low reflection layer is formed on the bottom surface of the concave groove, the metal layer can be formed according to the thickness of the blackened layer and blackened, and then deposited by depositing the metal material related to the central material layer 11B. . When the concave groove is manufactured on the side opposite to the bottom surface side, the metal material layer related to the central material layer 11B is manufactured, and then the metal layer is manufactured according to the thickness of the blackened layer and then blackened. Can do. In these cases, a metal material used for the blackening treatment may be applied to the intermediate material layer. In the case of applying a metal material such as chromium to the low reflection layer 11A, in the case of applying blackened Ni, blackened Cu, blackened Al, blackened Zn, or the like, or in the case of applying nanoparticles of low reflective carbon. Various configurations can be widely applied.

  According to this embodiment, the present invention can be applied in place of the linearly polarizing plates on the incident surface side and the output surface side of the liquid crystal cell, thereby reducing the overall thickness and ensuring sufficient mechanical strength.

[Third Embodiment]
FIG. 10 is a cross-sectional view showing an image display apparatus according to the third embodiment. This image display device 61 is an image display device using a so-called in-cell type liquid crystal display panel, and a liquid crystal cell 65 is formed by sandwiching a liquid crystal layer 5C made of a liquid crystal material between glass substrates 5A and 5B on which transparent electrodes are formed. A linearly polarizing plate 7 is disposed on the backlight 3 side of the liquid crystal cell 5. In this linearly polarizing plate 7, the transfer layer 4 or 51 provided with the polarizer layer 10 may be applied. The liquid crystal cell 65 is disposed by laminating a color filter 62, a transfer layer 63, and a retardation plate 64 on the inner surface of the glass substrate 5A on the emission surface side. The transfer layer 63 may be disposed between the color filter 62 and the glass substrate 5A.

  Here, the transfer layer 63 is formed by forming the low reflection layer 11A on both the bottom surface side and the reverse surface side of the concave groove related to the metal linear portion 11, and is laminated on the color filter 62 or the phase difference plate 64 by the transfer method. Alternatively, the color filter 62 and the glass substrate 5A are stacked and arranged. The transfer film according to the transfer layer 63 is configured in the same manner as the above-described embodiment except that the configuration regarding the low reflection layer 11A is different.

  Even if it is applied to an image display device provided with an in-cell type polarizer as in this embodiment, the entire structure can be made thin and sufficient mechanical strength can be ensured.

[Fourth Embodiment]
FIG. 11 is a cross-sectional view showing an image display apparatus according to the fourth embodiment. In this image display device 71, an antireflection film 72 is disposed on the panel surface (viewer side surface) of the liquid crystal display panel 2 which is an image display panel. Here, the antireflection film 72 is an antireflection film that prevents reflection by the function of a circularly polarizing plate, and is configured by laminating a transfer layer 73 on a quarter-wave plate 74.

  Here, the transfer layer 73 is produced by transferring the transfer layer 44 from the transfer film 52 described above for the second embodiment.

  As in this embodiment, the present invention can be applied to an antireflection film that prevents reflection by the function of a circularly polarizing plate, thereby reducing the overall thickness and ensuring sufficient mechanical strength.

[Fifth Embodiment]
FIG. 12 is a diagram for explaining a roll plate manufacturing method according to the fifth embodiment. This embodiment is configured in the same manner as the above-described embodiment except that the roll plate manufacturing method is different.

  In the manufacturing process of this embodiment, a replica plate 81 using a lithographic plate formed by forming a concavo-convex shape by the concave groove 21 is formed by a forming process using a flat plate forming plate. In this manufacturing process, a plurality of the duplicate plates 81 are arranged in close contact with the surface plate 82 or separated by a predetermined interval (FIG. 12A). Thereafter, a metal layer 83 is formed on the surface with a desired thickness by electroforming with nickel or the like (FIG. 12B), and then the metal layer 83 is peeled off (FIG. 12C).

  Thus, in this step, a sheet-shaped plate (83) having a large area in which a plurality of duplicate plates are produced using one original plate, and fine irregularities are produced on the surface by tiling of the plurality of duplicate plates. Is made.

  In this manufacturing process, both end portions of the sheet-like plate (83) are connected so as to form a cylindrical shape as a whole, thereby forming a sleeve plate. This embodiment is a roll formed by inserting a core material in a cylindrical shape or a columnar shape into this sleeve plate and arranging the sleeve plate on the peripheral side surface of this core material, thereby producing a fine uneven shape related to the shaping process on the peripheral side surface. Make a plate.

  Even if the sleeve plate is produced by tiling the duplicate plate produced using one original plate as in this embodiment to produce the roll plate, the same effect as in the above embodiment can be obtained. . In this case, the inclination of the ridge formed on the peripheral side surface of the roll plate can be variously set by inclining and arranging the shaping plate used for tiling, and the roll plate with a desired inclination can be easily set. Can be produced.

  Instead of this, simply, a resin sheet reshaped with a resin from the sheet plate (83) may be wound and fixed around a core material to form a roll plate, or the metal layer may be formed by electroforming. Instead of manufacturing (FIGS. 12B and 12C), a sheet re-molded directly with a resin may be wound and fixed as it is as a sheet-like plate (83) to form a roll plate.

[Other Embodiments]
The specific configuration suitable for the implementation of the present invention has been described in detail above. However, the present invention is not limited to the scope of the present invention, and various combinations of the above-described embodiments, and further the configuration of the above-described embodiments. Can be variously changed.

  That is, in the above-described embodiment, the case where the wavelength band that is applied to the image display device and restricts transmission is in the visible light range (wavelength of 380 nm to 800 nm) has been described. The present invention can be widely applied to the case where the transmission of light is limited. When the transmission of electromagnetic waves outside the visible light region is limited in this way, the appearance of the transparent solid dielectric portion is not necessarily transparent in visible light, and may be opaque in visible light.

  Further, in the above-described embodiment, the case where the transfer layer is transferred to the linearly polarizing plate and the quarter-wave plate and the polarizer is laminated is described. However, the present invention is not limited to this, for example, a phase difference for optical compensation. It can be transferred to an optical functional layer having various optical functions such as a film.

  In the above-described fourth embodiment, the case where the present invention is applied to an image display device including an image display panel using a liquid crystal display panel has been described. However, the present invention is not limited thereto, and an image display panel using an organic EL is provided. The present invention can be widely applied to image display devices.

  In the above-described embodiment, the case where the present invention is applied to an image display device has been described. However, the present invention is not limited thereto, and various optical devices such as an exposure device, a projector, illumination, sunglasses, a light control sheet, and the like can be used. It can be widely applied to a dimmer.

  Moreover, although the above-mentioned embodiment described the case where a polarizer was produced by the shaping process of the long film material using the shaping mold by the roll plate, the present invention is not limited to this, and a mold by a flat plate is used. The present invention can be widely applied to the case of manufacturing by processing the used single wafer.

1, 41, 61, 71 Image display device 2, 42 Liquid crystal display panel 3 Backlight 4, 43, 44, 63, 73 Transfer layer 5, 64 Liquid crystal cell 5A, 5B Glass substrate 5C Liquid crystal layer 6, 7 Linearly polarizing plate 9 , 51, 52, Transfer film 10 Polarizer layer 11 Metal linear portion 12 Transparent solid dielectric portion 13 Polarizer layer 15 Support base material 21 Concave groove 22 Metal layer 30 Roll plate 31 Base material 32 Byte 35 Linear polarizing plate winding Holder 36 Transfer film winding body 62 Color filter 64 Phase difference plate 72 Antireflection film 74 1/4 wavelength plate 81 Replica plate 82 Surface plate 83 Metal layer

Claims (14)

A transfer film provided with a polarizer layer that restricts transmission of incident electromagnetic waves according to the plane of polarization,
Comprising a support and a transfer layer releasably laminated on the support,
In the transfer layer,
A plurality of concave grooves with pitches and groove widths less than the shortest wavelength of the wavelength band that restricts transmission by the shaping resin material are produced,
A transfer film in which a metal material is disposed in the concave groove, and a metal linear portion having a pitch and a line width less than the shortest wavelength in a wavelength band for limiting transmission is produced. The transfer layer is
The transfer film according to claim 1, wherein the thickness is 20 μm or less and 0.2 μm or more. The metal linear part is:
The transfer film according to claim 1, wherein a low reflection layer having a lower reflectance than other portions is formed on a bottom surface side of the concave groove and / or on a surface opposite to the bottom surface side. In the winding body of the transfer film in which the transfer film in the form of a long film is wound,
On the support substrate, a transfer layer including a polarizer layer that restricts transmission of incident electromagnetic waves according to the polarization plane,
In the transfer layer,
A plurality of concave grooves with a pitch and a groove width less than the shortest wavelength of the wavelength band for limiting transmission by the shaping resin material are produced so as to extend in the longitudinal direction of the support substrate,
A winding body of a transfer film in which a metal material is disposed in the concave groove, and a metal linear portion having a pitch and a line width less than the shortest wavelength in a wavelength band that restricts transmission is produced. The transfer layer is
The winding body of the transfer film according to claim 4, wherein the thickness is 20 μm or less and 0.2 μm or more. The metal linear part is:
The winding of the transfer film according to claim 4 or 5, wherein a low-reflective layer having a lower reflectance than other portions is formed on a bottom surface side of the concave groove and / or on a surface opposite to the bottom surface side. Toru. Provided with an optical functional layer responsible for a desired optical function,
An optical film in which the transfer layer of the transfer film according to claim 1, 2, or 3 is laminated on the optical functional layer. In the wound body of the optical film in which the optical film in the form of a long film is wound,
An optical film winding body in which an optical functional layer having a desired optical function and the transfer layer of the transfer film according to any one of claims 4, 5, and 6 are laminated. An image display device in which the transfer layer of the transfer film according to claim 1, 2 or 3 is disposed on an image display panel. An image display device in which the optical film according to claim 7 is disposed on an image display panel. Provided with a transfer layer preparation step for preparing a transfer layer on a support substrate,
The transfer layer preparation step includes
A moldable resin layer is prepared on the support substrate and subjected to a mold treatment, and a plurality of concave grooves are formed on the surface of the moldable resin layer with pitches and groove widths less than the shortest wavelength of the wavelength band for limiting transmission. Concave and convex shape manufacturing process,
A method for producing a transfer film, comprising: arranging a metal material in the concave groove to produce a metal linear part with a pitch and a line width less than the shortest wavelength of a wavelength band for limiting transmission. The support substrate is in the form of a long film,
The uneven shape manufacturing step includes
The method for producing a transfer film according to claim 11, wherein the concave groove is formed in a direction extending in a longitudinal direction of the support base material. A transfer layer preparation step of preparing a transfer layer on a support substrate,
A transfer step of transferring the transfer layer to another member,
The transfer layer preparation step includes
A moldable resin layer is prepared on the support substrate and subjected to a mold treatment, and a plurality of concave grooves are formed on the surface of the moldable resin layer with pitches and groove widths less than the shortest wavelength of the wavelength band for limiting transmission. Concave and convex shape manufacturing process,
A method for producing an optical film, comprising: arranging a metal material in the concave groove to produce a metal linear part having a pitch and a line width less than the shortest wavelength in a wavelength band for limiting transmission. The support substrate is in the form of a long film,
The uneven shape manufacturing step includes
The method for producing an optical film according to claim 13, wherein the concave groove is formed in a direction extending in a longitudinal direction of the support base material.

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