Patent Publication Number: US-2017348943-A1

Title: Optical body, optical film adhesive body, and method for manufacturing optical body

Description:
CROSS REFERENCE TO PRIOR APPLICATION 
     This application is a National Stage patent application of PCT International Patent Application No. PCT/JP2015/082224 (filed on Nov. 17, 2015) under 35 U.S.C. §371, which claims priority to Japanese Patent Application No. 2014-263615 (filed on Dec. 25, 2014), which are all hereby incorporated by reference in their entirety. 
    
    
     TECHNICAL FIELD 
     The present invention relates to an optical body, an optical film adhesive body, and a method for manufacturing an optical body. 
     BACKGROUND ART 
     An optical film on which is formed a concave-convex structure in which the average period of the concavities and convexities is less than or equal to the visible light wavelengths has excellent anti-reflective effects for light in the visible light wavelength region. Consequently, an optical film having a concave-convex structure is used as an anti-reflective film, for example. Such a concave-convex structure is also called a moth-eye structure. Optical films on which a concave-convex structure is formed are disclosed in Patent Literatures 1 and 2, for example. 
     As a method of forming a concave-convex structure, there is the UV nanoimprint method disclosed in Patent Literature 1, for example. With the UV nanoimprint method, there is produced a master on the surface of which is formed a concave-convex structure. Subsequently, by coating a base material with an uncured light-curing resin, an uncured resin layer is formed on the base material. Subsequently, the uncured resin layer is transferred onto the concave-convex structure of the master, and the uncured resin layer is cured. Consequently, a concave-convex structure is formed on the base material (with this concave-convex structure having the reverse shape of the concave-convex structure of the master). 
     Meanwhile, as disclosed in Patent Literature 2, for example, a protective film is applied to the concave-convex structure of an anti-reflective film in some cases, to protect the concave-convex structure during storage, transport, usage, or the like of the anti-reflective film. The protective film is applied to the concave-convex structure with an adhesive. For this reason, when the protective film is peeled away from the concave-convex structure, in some cases residual adhesive may remain on the concave-convex structure. If residual adhesive remains on the concave-convex structure, in some cases the properties of the anti-reflective film may be degraded by the adhesive. A conceivable method of addressing this issue is to lower the adhesion of the adhesive, but with this method, the protective film disengages more readily from the concave-convex structure. In other words, there is a possibility that the concave-convex structure may be insufficiently protected by the protective film. Accordingly, Patent Literature 2 proposes the use of a protective film using a specific adhesive. 
     CITATION LIST 
     Patent Literature 
     Patent Literature 1: JP 2011-053496A 
     Patent Literature 2: JP 2011-088356A 
     SUMMARY OF INVENTION 
     Technical Problem 
     Meanwhile, to ensure the handling properties of the anti-reflective film, some degree of thickness in the anti-reflective film has been necessary. However, if the anti-reflective film is too thick, there is a problem in that the adhesive body of the anti-reflective film becomes thick. Furthermore, if the anti-reflective film is applied to an adherend with large concavities and convexities on the surface thereof, there is a problem in that the anti-reflective film cannot sufficiently follow the concavities and convexities on the surface of the adherend. 
     For example, as illustrated in  FIG. 11 , when using an adhesive layer  53  with a thickness of 25 μm to apply an anti-reflective film  52  with a thickness of 50 μm to a touch panel  50  having a frame body  51  with a height s of 50 μm, in some cases the anti-reflective film  52  is unable to conform to the height s of the frame body  51 . In this case, after the adhesion of the anti-reflective film  52 , an air gap  54  is formed at the perimeter of the frame body  51 , thereby degrading the appearance of the touch panel  50 . 
     Furthermore, when applying an anti-reflective film to an adherend with an adhesive agent, the refractive index of the anti-reflective film and the refractive index of the adhesive layer do not match in some cases. In such cases, there is a possibility that the reflectivity of the anti-reflective film may be degraded (that is, the reflectivity may increase). Furthermore, there is also a possibility that ripples may form and produce flaws in appearance, such as interference patterns. 
     A conceivable method of addressing the above issue is to form a concave-convex structure directly on the surface of the adherend. This method is somewhat effective if the surface of the adherend is flat and elements such as a frame body and wiring do not exist around the adherend, or alternatively, if the adherend is formed from a flexible member. However, in cases other than the above (such as if the surface of the adherend is curved, or if elements such as a frame body and wiring exist around the adherend, for example), there is a problem in that the quality of the concave-convex structure becomes inconsistent. Furthermore, forming the concave-convex structure directly on the surface of the adherend may interfere with subsequent processing steps in some cases. Consequently, the above issue cannot be solved fundamentally with this method. 
     Also, another conceivable method of addressing the above issue is to make the protective film thicker disclosed by Patent Literature 2. According to this method, the anti-reflective film is transported or the like as an optical body integrated with the protective film, thereby improving the handling properties of the optical body, and by extension, also improving the handling properties of the anti-reflective film. However, since this method requires a protective film, the demand to protect the concave-convex structure without the use of a protective film cannot be met. 
     Also, with the technology disclosed in Patent Literature 2, the protective film is peeled away from the anti-reflective film after the optical body integrated with the protective film and the anti-reflective film is applied to the adherend. At this point, there is another problem in that the anti-reflective film may possibly disengage from the adherend. 
     Accordingly, the present invention has been devised in light of the above issues, and an objective of the present invention is to provide a new and improved optical body, an optical film adhesive body, and a method for manufacturing an optical body, in which the concave-convex structure of the optical film can be protected without the use of a protective film, the optical film can be made thinner, the handling properties can be improved, the occurrence of defects caused by a difference in the refractive index between the adhesive layer and the optical film can be minimized, and the optical film can be applied more firmly to the adherend. 
     Solution to Problem 
     The inventor discovered the following matters, and as a result, conceived the present invention. Namely, (i) in the case where a master film is produced by using as a transfer mold a master (first master) on which a concave-convex structure (fourth concave-convex structure) is formed, an optical film may be produced by using the master film as a transfer mold. Furthermore, such a master film may be used as a protective film for the optical film. A concave-convex structure (first concave-convex structure) is formed on one surface of the optical film, namely the surface on the master film side. 
     (ii) An optical body that includes an optical film and a master film is able to gain thickness due to the master film. For this reason, the optical film may be made thinner while still improving the handling properties of the optical film. 
     (iii) By using the master film as a protective film for the optical film, it becomes unnecessary to prepare a separate protective film. 
     (iv) In the case of forming a concave-convex structure (second concave-convex structure) on the other surface of optical film, and additionally providing an adhesive layer on top of the second concave-convex structure, the adhesive strength between the optical film and the adhesive layer increases due to the anchor effect provided by the second concave-convex structure. Consequently, when applying the optical film to the adherend, the optical film is applied more firmly to the adherend. As a result, for example, when the master film is peeled away from the optical film after applying the optical film to the adherend, the optical film becomes less likely to disengage from the adherend. 
     (v) The second concave-convex structure reduces optical reflection caused by a difference in the refractive index between the adhesive layer and the optical film. As a result, the production of defects caused by such a difference in the refractive index (degraded reflectivity, ripple formation) is minimized. 
     (vi) The master film may also be used as an optical film (for example, an anti-reflective film). 
     According to an aspect of the present invention, there is provided an optical body, including: an optical film provided with a first concave-convex structure formed on one surface of the optical film, and a second concave-convex structure formed on an other surface of the optical film; and a master film that covers the first concave-convex structure, in which an average period of concavities and convexities of the first concave-convex structure is less than or equal to visible light wavelengths, and the master film is provided with a third concave-convex structure which is formed on a surface that faces the first concave-convex structure, and which has a reverse shape of the first concave-convex structure. 
     Here, an aspect ratio of the second concave-convex structure may be smaller than an aspect ratio of the first concave-convex structure, the aspect ratio of the first concave-convex structure may be a ratio of a height of convexities constituting the first concave-convex structure and a diameter of a bottom face of concavities constituting the first concave-convex structure, and the aspect ratio of the second concave-convex structure may be a ratio of a height of convexities constituting the second concave-convex structure and a diameter of a bottom face of concavities constituting the second concave-convex structure. 
     Further, a density of concavities and convexities of the second concave-convex structure may be smaller than a density of concavities and convexities of the first concave-convex structure. 
     Further, a thickness of the optical film may be from 1 μm to 60 μm. 
     Further, an average period of concavities and convexities of the second concave-convex structure may be less than or equal to visible light wavelengths. 
     Further, the master film may be provided with a base material film, and a concave-convex resin layer formed on one surface of the base material film, and the third concave-convex structure may be formed on the concave-convex resin layer. 
     Further, the master film may be provided with an inorganic film that covers the third concave-convex structure. 
     Further, a release agent may be added to at least one of the master film and the optical film. 
     Further, the master film and the optical film may have a mutually different elastic modulus. 
     Further, at least one from among the first to third concave-convex structures may be formed by a cured light-curing resin. 
     Further, a spectral reflectance (for wavelengths from 350 nm to 800 nm) of the surface on which is formed the first concave-convex structure may be from 0.1% to 1.8%, and a spectral reflectance (for wavelengths from 350 nm to 800 nm) of the surface on which is formed the third concave-convex structure may be from 0.1% to 1.5%. 
     Further, the optical film may be formed in a solid cast. 
     Further, an adhesive layer that coverts the second concave-convex structure may further be included. 
     Further, a thickness of the adhesive layer may be from 1 μm to 50 μm. 
     According to another aspect of the present invention, there is provided an optical film adhesive body, including: an adherend; and the above-mentioned optical film applied to the adherend via an adhesive layer. 
     According to another aspect of the present invention, there is provided a method for manufacturing the above-mentioned optical body, the method including: a step of preparing a first master, on a surface of which is formed a fourth concave-convex structure having a reverse shape of the third concave-convex structure; a step of preparing a second master, on a surface of which is formed a fifth concave-convex structure having a reverse shape of the second concave-convex structure; a step of producing the master film, using the first master as a transfer mold; and a step of forming the optical film on the master film, using the master film and the second master as a transfer mold. 
     Here, the method may include a step of transferring the fourth concave-convex structure of the first master to an uncured resin layer for the master film, thereby forming the third concave-convex structure on a surface of the uncured resin layer for the master film; a step of producing the master film by curing the uncured resin layer for the master film; a step of transferring the third concave-convex structure formed on the surface of the master film to one surface of an uncured resin layer for the optical film, thereby forming the first concave-convex structure on the one surface of the uncured resin layer for the optical film; a step of transferring the fifth concave-convex structure of the second master to an other surface of the uncured resin layer for the optical film, thereby forming the second concave-convex structure on the other surface of the uncured resin layer for the optical film; and a step of producing the optical film by curing the uncured resin layer for the optical film. 
     Further, a release agent may be added to at least one of the uncured resin layer for the master film and the uncured resin layer for the optical film. 
     Further, the uncured resin layer for the master film may be formed on a base material film. 
     Further, the method may further include a step of forming an inorganic film on the third concave-convex structure of the master film, and the third concave-convex structure on which is formed the inorganic film may be transferred to the one surface of the uncured resin layer for the optical film. 
     Further, at least one of the uncured resin layer for the master film and the uncured resin layer for the optical film may be made up of an uncured light-curing resin. 
     Further, an aspect ratio of the second concave-convex structure may be smaller than an aspect ratio of the first concave-convex structure, the aspect ratio of the first concave-convex structure may be a ratio of a height of the convexities constituting the first concave-convex structure and a diameter of a bottom face of the concavities constituting the first concave-convex structure, and the aspect ratio of the second concave-convex structure may be a ratio of a height of the convexities constituting the second concave-convex structure and a diameter of a bottom face of the concavities constituting the second concave-convex structure. 
     Further, a density of the concavities and convexities of the second concave-convex structure may be made smaller than a density of the concavities and convexities of the first concave-convex structure. 
     Further, a thickness of the optical film may be made to be from 1 μm to 60 μm. 
     Further, an average period of concavities and convexities of the fifth concave-convex structure may be less than or equal to visible light wavelengths. 
     Further, the master film and the optical film may be made to have mutually different values of elastic modulus. 
     Further, the method may further include a step of forming an adhesive layer on the second concave-convex structure formed on the optical film. 
     Further, a thickness of the adhesive layer may be made to be from 1 μm to 50 μm. 
     Advantageous Effects of Invention 
     According to the present invention, a master film may be used as a protective film for an optical film. For this reason, a concave-convex structure of the optical film (first concave-convex structure) may be protected without using a protective film. Furthermore, thickness may be gained due to the master film. For this reason, the optical film may be made thinner while still improving the handling properties of the optical film. Furthermore, the optical film includes a second concave-convex structure. For this reason, the adhesive strength between the optical film and the adhesive layer increases due to the anchor effect provided by the second concave-convex structure. Consequently, the optical film may be applied more firmly to the adherend. Furthermore, the second concave-convex structure reduces optical reflection caused by a difference in the refractive index between the adhesive layer and the optical film. As a result, the production of defects caused by such a difference in the refractive index (degraded reflectivity, ripple formation) is minimized. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a cross-sectional view illustrating an example of an optical body according to the present embodiment. 
         FIG. 2A  is a plan view illustrating an example of a concave-convex structure (third concave-convex structure) formed on a surface of a master film. 
         FIG. 2B  is an XX cross-sectional view illustrating an example of a concave-convex structure formed on a surface of a master film. 
         FIG. 3A  is a perspective view illustrating an example appearance of a master (first master) on the circumferential face of which is formed a concave-convex structure (fourth concave-convex structure). 
         FIG. 3B  is a perspective view illustrating an example appearance of a master (second master) on the circumferential face of which is formed a concave-convex structure (fifth concave-convex structure). 
         FIG. 3C  is a cross-sectional view for explaining an optical body manufacturing process. 
         FIG. 3D  is a cross-sectional view for explaining an optical body manufacturing process. 
         FIG. 3E  is a cross-sectional view for explaining an optical body manufacturing process. 
         FIG. 3F  is a cross-sectional view for explaining an optical body manufacturing process. 
         FIG. 3G  is a cross-sectional view for explaining an optical body manufacturing process. 
         FIG. 3H  is a cross-sectional view for explaining an optical body manufacturing process. 
         FIG. 3I  is a block diagram illustrating an example configuration of a photolithography device. 
         FIG. 3J  is a schematic depiction illustrating an example of a transfer device that manufactures a master film roll-to-roll. 
         FIG. 3K  is a schematic depiction illustrating an example of a transfer device that manufactures an optical film roll-to-roll. 
         FIG. 3L  is a cross-sectional view for explaining an optical body manufacturing process. 
         FIG. 4A  is a cross-sectional view illustrating an example of an optical body usage method. 
         FIG. 4B  is a cross-sectional view illustrating an example of an optical body usage method. 
         FIG. 5A  is a cross-sectional view illustrating another example of an optical body usage method. 
         FIG. 5B  is a cross-sectional view illustrating another example of an optical body usage method. 
         FIG. 5C  is a cross-sectional view illustrating another example of an optical body usage method. 
         FIG. 6A  is a cross-sectional view for explaining a method of measuring a spectral reflectance of a master film. 
         FIG. 6B  is a cross-sectional view for explaining a method of measuring a spectral reflectance of an optical film. 
         FIG. 7A  is spectral reflection spectra of Example 1 and Comparative Examples 1a and 1b. 
         FIG. 7B  is spectral reflection spectra of Example 2 and Comparative Examples 2a and 2b. 
         FIG. 7C  is spectral reflection spectra of optical films of Example 3 and Comparative Examples 3a and 3b. 
         FIG. 8  is spectral reflection spectra of optical films of Examples 4 and 5, and Comparative Examples 1b and 4. 
         FIG. 9  is spectral transmittance curves indicating results of a light resistance test. 
         FIG. 10A  is a cross-sectional view of a touch panel to which is applied an optical film according to the present embodiment. 
         FIG. 10B  is a cross-sectional view illustrating a state after performing an autoclaving process on the optical film illustrated in  FIG. 10A . 
         FIG. 11  is a cross-sectional view of a touch panel to which is applied an anti-reflective film of the related art. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, (a) preferred embodiment(s) of the present invention will be described in detail with reference to the appended drawings. In this specification and the appended drawings, structural elements that have substantially the same function and structure are denoted with the same reference numerals, and repeated explanation of these structural elements is omitted. 
     &lt;1. Overall Configuration of Optical Body&gt; 
     First, an overall configuration of an optical body  1  according to the present embodiment will be described on the basis of  FIG. 1 . The optical body  1  is provided with a master film  10 , an optical film  21 , and an adhesive layer  23 . Note that the adhesive layer  23  may also be absent (see the second usage method described later). 
     The master film  10  is a film that protects the optical film  21 . Also, by making the master film  10  thick, it is possible to improve the handling properties of the optical body  1  while also making the optical film  21  thinner. Furthermore, the master film  10  is usable as a protective film, and thus it is not necessary to prepare a separate protective film to protect the optical film  21 . The master film  10  is provided with a third concave-convex structure  15  formed on the surface thereof that faces the optical film  21 . The average period of the concavities and convexities of the third concave-convex structure  15  is less than or equal to the visible light wavelengths. 
     Meanwhile, the optical film  21  is provided with a first concave-convex structure  25  formed on the surface (one surface) thereof that faces the master film  10 . The first concave-convex structure  25  has the reverse shape of the third concave-convex structure  15 , and engages with the third concave-convex structure  15 . In other words, first convexities  25   a  constituting the first concave-convex structure  25  fit into third concavities  15   b  constituting the third concave-convex structure  15 . Likewise, third convexities  15   a  constituting the third concave-convex structure  15  fits into first concavities  25   b  constituting the first concave-convex structure  25 . Also, the average period of the concavities and convexities of the first concave-convex structure  25  is less than or equal to the visible light wavelengths. Consequently, not only the optical film  21  but also the master film  10  becomes usable as an anti-reflective film. Also, the master film  10  and the optical film  21  are separable from each other. 
     In addition, the optical film  21  is provided with a second concave-convex structure  26  formed on the surface (other surface) thereof on the opposite side of the surface that faces the master film  10 . The average period of the concavities and convexities of the second concave-convex structure  26  is not necessarily required to be less than or equal to the visible light wavelengths, but is preferably less than or equal to the visible light wavelengths. The adhesive layer  23  is provided on top of the second concave-convex structure  26 , and covers the second concave-convex structure  26 . The adhesive layer  23  is used to apply the optical film  21  to the adherend. In the present embodiment, the adhesive strength between the adhesive layer  23  and the optical film  21  may be increased due to the anchor effect provided by the second concave-convex structure  26 . Consequently, the optical film  21  may be applied more firmly to the adherend. Furthermore, the second concave-convex structure  26  reduces optical reflection caused by a difference in the refractive index between the adhesive layer and the optical film  21 . As a result, the production of defects caused by such a difference in the refractive index (degraded reflectivity, ripple formation) are minimized. 
     &lt;2. Configuration of Master Film&gt; 
     Next, the configuration of the master film  10  will be described on the basis of  FIGS. 1 to 2B . The master film  10  is provided with a base material film  12 , and a concave-convex resin layer  11  formed on one surface of the base material film  12 . Note that the base material film  12  and the concave-convex resin layer  11  may also be made into a solid cast. For example, by making the base material film  12  be a thermoplastic resin film, the base material film  12  and the concave-convex resin layer  11  may be made into a solid cast. Details will be described later. 
     The third concave-convex structure  15  is formed on the surface of the concave-convex resin layer  11  (that is, the surface of the master film  10 ). The third concave-convex structure  15  includes multiple third convexities  15   a , which are convex in the film-thickness direction of the master film  10 , and multiple third concavities  15   b , which are concave in the film-thickness direction of the master film  10 . The third convexities  15   a  and the third concavities  15   b  are arranged periodically on the master film  10 . For example, in the example of  FIG. 2A , the third convexities  15   a  and the third concavities  15   b  are arranged in a staggered lattice. Obviously, the third convexities  15   a  and the third concavities  15   b  may also be arranged in a different arrangement pattern. For example, the third convexities  15   a  and the third concavities  15   b  may also be arranged in a square lattice. Additionally, the third convexities  15   a  and the third concavities  15   b  may also be arranged randomly. The shapes of the third convexities  15   a  and the third concavities  15   b  are not particularly limited. The shapes of the third convexities  15   a  and the third concavities  15   b  may also be bullet-shaped, conical, columnar, or needle-shaped. Note that the shape of the third concavities  15   b  means the shape formed by the inner wall faces of the third concavities  15   b.    
     The average period of the concavities and convexities of the third concave-convex structure  15  is less than or equal to the visible light wavelengths (for example, less than or equal to 830 nm), preferably more than or equal to 100 nm and less than or equal to 350 nm, more preferably more than or equal to 150 nm and less than or equal to 280 nm, and further more preferably more than or equal to 153 nm and less than or equal to 270 nm. Consequently, the third concave-convex structure  15  has what is called a moth-eye structure. Herein, if the average period is less than 100 nm, there is a possibility that the formation of the third concave-convex structure  15  may become difficult, which is not preferable. Also, if the average period exceeds 350 nm, there is a possibility that a diffraction phenomenon of visible light may occur, which is not preferable. 
     The average period of the third concave-convex structure  15  is the arithmetic mean value of the distance between adjacent third convexities  15   a  and between adjacent third concavities  15   b . Note that the third concave-convex structure  15  is observable with a device such as a scanning electronic microscope (SEM) or a cross-section tunneling electronic microscope (cross-section TEM), for example. Also, a method of calculating the average period is as follows, for example. Namely, multiple pairs of adjacent third concavities  15   b  and pairs of adjacent third convexities  15   a  are picked up, and the distance therebetween (pitch) is measured. Note that the distance between the third convexities  15   a  is the distance between the apices of the third convexities  15   a , for example. Also, the distance between the third concavities  15   b  is the distance between the center points of the third concavities  15   b , for example. Subsequently, the average period may be calculated by taking the arithmetic mean of the measured values. The average period of other concave-convex structures is measurable by a similar method. 
     Note that when the third convexities  15   a  and the third concavities  15   b  are arranged periodically on the master film  10 , the pitch between the third convexities  15   a  (or the third concavities  15   b ) is categorized as the dot pitch L 2  and the track pitch L 3 , for example. In other words, when the third convexities  15   a  and the third concavities  15   b  are arranged periodically on the master film  10 , the third concave-convex structure  15  may be considered to be an arrangement of parallel tracks (rows) made up of multiple third convexities  15   a  and third concavities  15   b . In the example of  FIG. 2A , the tracks extend in the horizontal direction, and are lined up in the vertical direction. Also, the third convexities  15   a  (or the third concavities  15   b ) arranged between adjacent tracks are offset from each other in the track length direction by half the length of the third convexities  15   a  (or the third concavities  15   b ). The dot pitch L 2  is the pitch between the third convexities  15   a  (or the third concavities  15   b ) arranged in the track length direction. The track pitch L 3  is the pitch between the third convexities  15   a  (or the third concavities  15   b ) arranged in the track arrangement direction (the vertical direction in  FIG. 2A ). The pitch of other concave-convex structures is categorized by a similar method. 
     Also, the height of the third convexities  15   a  (depth of the third concavities  15   b ) L 1  illustrated in  FIG. 2B  is not particularly limited, being preferably more than or equal to 150 nm and less than or equal to 300 nm, more preferably more than or equal to 190 nm and less than or equal to 300 nm, and still more preferably more than or equal to 190 nm and less than or equal to 230 nm. 
     By having the average period and the height of the third concave-convex structure  15  take values in the above ranges, the anti-reflective properties of the master film  10  may be improved further. Specifically, the spectral reflectance of the third concave-convex structure  15  (spectral specular reflectance for wavelengths from 350 nm to 800 nm) may be set from 0.1% to 1.8%, preferably from 0.1% to 1.5%. Also, in the case of forming the third concave-convex structure  15  by a transfer method as described later, the master film  10  may be released easily from the first master  30  after the transfer. Note that the height of the third convexities  15   a  may also differ among the individual third convexities  15   a.    
     The concave-convex resin layer  11  is made up of a cured curing resin. The cured curing resin is preferably transparent. The curing resin includes a polymerizable compound and a curing initiator. The polymerizable compound is a resin that is cured by the curing initiator. The polymerizable compound may be a compound such as a polymerizable epoxy compound or a polymerizable acrylic compound, for example. A polymerizable epoxy compound is a monomer, oligomer, or prepolymer having one or multiple epoxy groups in the molecule. Examples of polymerizable epoxy compounds include various bisphenol epoxy resins (such as bisphenol A and F), novolac epoxy resin, various modified epoxy resins such as rubber and urethane, naphthalene epoxy resin, biphenyl epoxy resin, phenol novolac epoxy resin, stilbene epoxy resin, triphenol methane epoxy resin, dicyclopentadiene epoxy resin, triphenyl methane epoxy resin, and prepolymers of the above. 
     A polymerizable acrylic compound is a monomer, oligomer, or prepolymer having one or multiple acrylic groups in the molecule. Herein, monomers are further classified into monofunctional monomers having one acrylic group in the molecule, bifunctional monomers having two acrylic groups in the molecule, and multifunctional monomers having three or more acrylic groups in the molecule. 
     Examples of “monofunctional monomers” include carboxylic acids (acrylic acids), hydroxy monomers (2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 4-hydroxybutyl acrylate), alkyl or alicyclic monomers (isobutyl acrylate, t-butyl acrylate, isooctyl acrylate, lauryl acrylate, stearyl acrylate, isobornyl acrylate, cyclohexyl acrylate), other functional monomers (2-methoxyethyl acrylate, methoxyethylene glycol acrylate, 2-ethoxyethyl acrylate, tetrahydrofurfuryl acrylate, benzyl acrylate, ethyl carbitol acrylate, phenoxyethyl acrylate, N,N-dimethylamino ethyl acrylate, N,N-dimethylamino propyl acrylamide, N,N-dimethyl acrylamide, acryloyl morpholine, N-isopropyl acrylamide, N,N-diethyl acrylamide, N-vinyl pyrrolidone, 2-(perfluorooctyl)ethyl acrylate, 3-perfluorohexyl-2-hydroxypropyl acrylate, 3-perfluorooctyl-2-hydroxypropyl-acrylate, 2-(perfluorodecyl)ethyl-acrylate, 2-(perfluoro-3-methylbutyl)ethyl acrylate), 2,4,6-tribromophenol acrylate, 2,4,6-tribromophenol methacrylate, 2-(2,4,6-tribromophenoxy)ethyl acrylate), and 2-ethylhexyl acrylate. 
     Examples of “bifunctional monomers” include tri(propylene glycol) di-acrylate, trimethylolpropane-diaryl ether, and urethane acrylate. 
     Examples of “multifunctional monomers” include trimethylolpropane tri-acrylate, dipentaerythritol penta- and hexa-acrylate, and ditrimethylolpropane tetra-acylate. 
     Examples other than the polymerizable acrylic compounds listed above include acrylmorpholine, glycerol acrylate, polyether acrylates, N-vinylformamide, N-vinylcaprolactone, ethoxy diethylene glycol acrylate, methoxy triethylene glycol acrylate, polyethylene glycol acrylate, ethoxylated trimethylolpropane tri-acrylate, ethoxylated bisphenol A di-acrylate, aliphatic urethane oligomers, and polyester oligomers. From the perspective of transparency and separability from the optical film  21  of the master film  10 , the polymerizable compound preferably is a polymerizable acrylic compound. 
     The curing initiator is a material that cures the curing resin. Examples of the curing initiator include thermal curing initiators and light-curing initiators, for example. The curing initiator may also be one that cures by some kind of energy beam other than heat or light (for example, an electron beam) or the like. In the case in which the curing initiator is a thermal curing initiator, the curing resin is a thermosetting resin, whereas in the case in which the curing initiator is a light-curing initiator, the curing resin is a light-curing resin. 
     Herein, from the perspective of transparency and separability from the optical film  21  of the master film  10 , the curing initiator preferably is an ultraviolet-curing initiator. Consequently, the curing resin preferably is an ultraviolet-curing acrylic resin. An ultraviolet-curing initiator is a type of light-curing initiator. Examples of ultraviolet-curing initiators include 2,2-dimethoxy-1,2-diphenylethane-1-one, 1-hydroxy-cyclohexyl phenyl ketone, and 2-hydroxy-2-methyl-1-phenyl propane-1-one. 
     Additionally, additives may also be added to the concave-convex resin layer  11  depending on the purpose of the optical body  1 . Examples of additives include inorganic fillers, organic fillers, leveling agents, surface conditioners, and antifoaming agents. Note that examples of types of inorganic fillers include metallic oxide particles such as SiO 2 , TiO 2 , ZrO 2 , SnO 2 , and Al 2 O 3 . Furthermore, a release agent or the like may also be added to the concave-convex resin layer  11  to enable easy separation of the master film  10  and the optical film  21 . Details will be described later. 
     The thickness of the concave-convex resin layer  11  (in other words, the distance D 3  from the surface on the base material film  12  side of the concave-convex resin layer  11  to the apices of the third convexities  15   a ) is preferably from 1 μm to 60 μm from the perspective of manufacturing consistency of the third concave-convex structure  15 . Note that the thickness of the concave-convex resin layer  11  is measurable with the Mitutoyo Litematic VL-50S thickness measuring unit, for example. Specifically, the thickness of the base material film  12  before the formation of the concave-convex resin layer  11 , and the thickness of the base material film  12  after the formation of the concave-convex resin layer  11 , or in other words the master film  10 , are measured, and the difference between the two is treated as the thickness of the concave-convex resin layer  11 . Note that the thickness of the concave-convex resin layer  11  may vary in some cases depending on the measurement point. In this case, it is sufficient to take the arithmetic mean of the values at multiple measurement points as the thickness D 3  of the concave-convex resin layer  11 . 
     The type of the base material film  12  is not particularly limited, but in the case of using the master film  10  as an anti-reflective film, a transparent and tear-resistant film is preferable. Examples of the base material film  12  include polyethylene terephthalate (PET) film and triacetyl cellulose (TAC) film. In the case of using the master film  10  as an anti-reflective film, the base material film  12  is preferably made of a highly transparent material. 
     In the present embodiment, the master film  10  is able to protect the first concave-convex structure  25  of the optical film  21 . Furthermore, by making the master film  10  thick, it is possible to improve the handling properties of the optical body  1 . In other words, in the present embodiment, since the handling properties of the optical body  1  may be ensured by the master film  10 , the optical film  21  may be made thinner. Making the master film  10  thicker is achieved by making the base material film  12  thicker, for example. It is sufficient to adjust the thickness of the base material film  12  as appropriate according to the purpose of the optical body  1 , or in other words the handling properties demanded of the optical body  1 . The thickness of the base material film  12  may be from 50 μm to 125 μm, for example. 
     &lt;3. Configuration of Optical Film&gt; 
     Next, the configuration of the optical film  21  will be described on the basis of  FIG. 1 . The optical film  21  is provided with the first concave-convex structure  25  formed on one surface thereof (the surface on the side that faces the master film  10 ), and the second concave-convex structure  26  formed on another surface thereof (the surface on the side that faces the adhesive layer  23 ). 
     The first concave-convex structure  25  includes multiple first convexities  25   a , which are convex in the film-thickness direction of the optical film  21 , and multiple first concavities  25   b , which are concave in the film-thickness direction of the optical film  21 . The first concave-convex structure  25  has the reverse shape of the third concave-convex structure  15 . Consequently, the average period of the first concave-convex structure  25  approximately matches the average period of the third concave-convex structure  15 . In other words, in the first concave-convex structure  25 , the average period of the concavities and convexities likewise is less than or equal to the visible light wavelengths. 
     Specifically, the average period of the concavities and convexities of the first concave-convex structure  25  is less than or equal to the visible light wavelengths (for example, less than or equal to 830 nm), preferably more than or equal to 100 nm and less than or equal to 350 nm, more preferably more than or equal to 150 nm and less than or equal to 280 nm, and more preferably more than or equal to 153 nm and less than or equal to 270 nm. The method of computing the average period is similar to that of the third concave-convex structure  15  described earlier. Consequently, the first concave-convex structure  25  has what is called a moth-eye structure. Also, the height of the first convexities  25   a  is not particularly limited, being preferably more than or equal to 150 nm and less than or equal to 300 nm, more preferably more than or equal to 190 nm and less than or equal to 300 nm, and still more preferably more than or equal to 190 nm and less than or equal to 230 nm. 
     By having the average period and the height of the first concave-convex structure  25  take values in the above ranges, the anti-reflective properties of the optical film  21  may be improved further. Specifically, the spectral reflectance (for wavelengths from 350 nm to 800 nm) of the first concave-convex structure  25  may be set from 0.1% to 1.8%. Furthermore, oscillations in the spectral reflection spectrum are reduced. In other words, ripples are reduced. 
     The second concave-convex structure  26  includes multiple second convexities  26   a , which are convex in the film-thickness direction of the optical film  21 , and multiple second concavities  26   b , which are concave in the film-thickness direction of the optical film  21 . The second concave-convex structure  26  is able to increase the adhesive strength between the optical film  21  and the adhesive layer  23  due to an anchor effect. Note that the average period of the concavities and convexities of the second concave-convex structure  26  is not necessarily required to be less than or equal to the visible light wavelengths. However, from the perspective of improved anti-reflective properties of the optical film  21 , the average period of the concavities and convexities of the second concave-convex structure  26  is preferably less than or equal to the visible light wavelengths. Furthermore, from the perspective of suppressing unwanted diffracted light, the average period of the concavities and convexities of the second concave-convex structure  26  is preferably comparable with the average period of the concavities and convexities of the first concave-convex structure  25 . Also, the height of the second convexities  26   a  is preferably comparable with the height of the first convexities  25   a . In other words, the second concave-convex structure  26  preferably has a shape that is comparable with the first concave-convex structure  25 . 
     Herein, the second concave-convex structure  26  is formed by using a second master  40  described later as a transfer mold. Consequently, if the peeling strength of the second master  40  (in other words, the anchor effect on the second master  40 ) is excessively higher than the peeling strength of the master film  10  (in other words, the anchor effect on the master film  10 ), the following problem may occur. Namely, when peeling the optical film  21  away from the second master  40 , there is a possibility that instead of the second master  40  peeling away from the optical film  21 , the master film  10  may peel away from the optical film  21 . For this reason, the peeling strength of the second master  40  is preferably not set excessively high. Specifically, the aspect ratio of the second concave-convex structure  26  is preferably smaller than the aspect ratio of the first concave-convex structure  25 . Herein, the aspect ratio of the first concave-convex structure  25  is the ratio (height/diameter) of the height of the first convexities  25   a  and the diameter of the bottom face of the first concavities  25   b . Herein, the diameter of the first concavities  25   b  specifically may be taken to be the pitch between the first concavities  25   b . Herein, the pitch of the first concavities  25   b  is categorized as a track pitch and a dot pitch, as described earlier. Consequently, the diameter of the first concavities  25   b  may be taken to be the arithmetic mean value of the track pitch and the dot pitch. Meanwhile, the aspect ratio of the second concave-convex structure  26  is the ratio (height/diameter) of the height of the second convexities  25   a  and the diameter of the bottom face of the second concavities  26   b . Note that in the case of measuring the aspect ratio at multiple measurement points, there is a possibility that the measured values may vary. In this case, it is sufficient to use the arithmetic mean of the measured values. 
     Note that another method for making the master film  10  less likely to peel away from the optical film  21  is to make the density of the concavities and convexities of the second concave-convex structure  26  less than the density of the concavities and convexities of the first concave-convex structure  25 . Herein, the density of the concavities and convexities of the first concave-convex structure  25  means the number of first convexities  25   a  (or first concavities  25   b ) formed per unit area. Also, the density of the second concave-convex structure  26  means the number of second convexities  26   a  (or second concavities  26   b ) formed per unit area. It is sufficient to carry out at least one of the above method of adjusting the aspect ratios and the method of adjusting the densities of the concavities and convexities. 
     The thickness of the optical film  21  (specifically, the distance D 1  from the apices of the first convexities  25   a  to the apices of the second convexities  26   a ) is not particularly limited, but is preferably from 1 μm to 60 μm from the perspective of manufacturing consistency of the first concave-convex structure  25  and the second concave-convex structure  26 . Note that the thickness of the optical film  21  is measurable with the Mitutoyo Litematic VL-50S thickness measuring unit, for example. The thickness of the optical film  21  may vary in some cases depending on the measurement point. In this case, it is sufficient to take the arithmetic mean of the values at multiple measurement points as the thickness of the optical film  21 . 
     However, in the present embodiment, the optical body  1  is able to gain thickness due to the master film  10 . Consequently, the optical film  21  may be made thinner while also ensuring the handling properties of the optical body  1 . For example, the thickness of the optical film  21  may be from 1 μm to 10 μm, and more preferably from 1 μm to 6 μm. Thus, in the present embodiment, the optical film  21  may be made thinner. Consequently, when manufacturing the optical film  21 , it is not necessary to prepare a separate base material film for the optical film. In other words, the optical film  21  is preferably made in a solid cast. Obviously, a base material film for the optical film may also be prepared, and the first concave-convex structure  25  and the second concave-convex structure  26  may be formed on this base material film. Note that even in this case, the first concave-convex structure  25  may be formed using the master film  10 , and the second concave-convex structure  26  may be formed using the second master  40 . Alternatively, the first concave-convex structure  25  may be formed on one surface of the optical film  21  using the master film  10 . Subsequently, a concave-convex resin layer having the second concave-convex structure  26  may be prepared and applied onto the optical film  21 . In this case, the adjustment of the aspect ratios described above is not strictly necessary. However, from the perspective of making the optical film  21  thinner and simplifying the manufacturing steps, the optical film  21  is preferably made in a solid cast. It is sufficient for the optical film  21  to be made of a curing resin or the like similar to the concave-convex resin layer  11 . 
     &lt;3-1. Configuration for Enabling Separability of Master Film and Optical Film&gt; 
     The master film  10  is separable from the optical film  21 . In more detail, the concave-convex resin layer  11  of the master film  10  and the optical film  21  are separable from each other. 
     The method by which the concave-convex resin layer  11  of the master film  10  and the optical film  21  are separable is not particularly limited, and may be the following methods, for example. The following methods may be conducted alone, or multiple methods may be used jointly. For example, a release agent may be added to at least one of the concave-convex resin layer  11  and the optical film  21 . Herein, the type of release agent is not particularly limited, and may be a silicone-type or fluorine-type release agent or the like. 
     Additionally, the elastic modulus (Young&#39;s modulus) of the concave-convex resin layer  11  may be set to a different value than the elastic modulus of the optical film  21 . Note that the difference between the elastic modulus of the concave-convex resin layer  11  and the elastic modulus of the optical film  21  is preferably from 400 MPa to 1200 MPa. For example, the elastic modulus of the optical film  21  may be set from 300 MPa to 700 MPa, while the elastic modulus of the concave-convex resin layer  11  may be set from 700 MPa to 1500 MPa. At this point, the method of adjusting the elastic modulus of the concave-convex resin layer  11  and the optical film  21  may be, for example, mixing into the uncured curing resin a modified diacrylate with few functional groups, or a glycol resin or the like having a low modulus after curing. Herein, the glycol resin having a low modulus after curing may be polyethylene glycol diacrylate or the like, for example. 
     In addition, an inorganic film (for example, an inorganic film  16  illustrated in  FIG. 3L ) may be formed on the surface of the third concave-convex structure  15 . Herein, the material constituting the inorganic film may be silicon oxide, silicon, tungsten oxide, ITO, or the like. The thickness of the inorganic film is not particularly limited, and may be approximately from several nanometers to 20 nm, for example. The inorganic film is formed on the surface of the third concave-convex structure  15  by sputtering or the like, for example. If an inorganic film is formed on the surface of the third concave-convex structure  15 , the processes described above may also be omitted. 
     &lt;4. Configuration of Adhesive Layer&gt; 
     The adhesive layer  23  is formed on top of the second concave-convex structure  26 . For this reason, in the present embodiment, the adhesive strength between the optical film  21  and the adhesive layer  23  may be increased due to the anchor effect provided by the second concave-convex structure  26 . As a result, the optical film  21  may be applied firmly to the adherend. 
     The material constituting the adhesive layer  23  is not particularly limited, and may be selected appropriately according to factors such as the purpose of the optical body  1 . For example, the adhesive layer  23  is made up of a curing adhesive agent such as a light-curing adhesive agent or a thermosetting adhesive agent, or a pressure-sensitive adhesive agent (adhesive agent). More specifically, the adhesive layer  23  is preferably formed from an optically clear adhesive agent with high total light transmittance and low haze. For example, the adhesive layer  23  is preferably made up of optically clear adhesive (OCA) tape such as a non-carrier acrylic adhesive film or the like. Additionally, the adhesive layer  23  may also be made up of a light-resistant and heat-resistant curing adhesive agent. In this case, the light resistance and heat resistance of the optical body  1  may be improved. Also, preferably, the refractive index of the adhesive layer  23  approximately matches the refractive index of the adherend. Consequently, when the optical film  21  is made to adhere to the adherend, the reflectance on the optical film side may be reduced significantly. Also, before applying the optical film  21  to the adherend, it is preferable to cover the adhesive layer  23  with a protective film, from the perspective of protecting the adhesive layer  23 . 
     The thickness of the adhesive layer  23  (that is, the distance D 2  from the bottom face of the second concavities  26   b  to the surface of the adhesive layer  23 ) is not particularly limited, but is preferably from 1 μm to 50 μm, from the perspective of the handling properties of the optical body  1  during application work, and the conformability of the optical body  1  to the surface shape of the adherend (the object to which the optical body  1  is applied). 
     Therefore, in the present embodiment, the thickness of the optical film  21  may be set from 1 μm to 60 μm, more preferably from 1 μm to 10 μm, and the thickness of the adhesive layer  23  may be set from 1 μm to 50 μm. Consequently, the total thickness of the optical film  21  and the adhesive layer  23  may be set from 2 μm to 110 μm, more preferably from 2 μm to 60 μm. 
     Consequently, the optical film adhesive body with the optical film  21  applied thereto may be made thinner. Also, the optical film  21  is able to adequately conform to the surface shape of the adherend. For example, as illustrated in  FIG. 10A , in the case of using the adhesive layer  23  with a thickness of 20 μm to apply the optical film  21  with a thickness of 5 μm to a touch panel  50  having a frame body  51  with a height s of 50 μm, the optical film  21  may be applied to the surface of the touch panel  50  and the frame body  51 , while forming almost no air gap  54  at the perimeter of the frame body  51 . Furthermore, after applying the optical film  21 , an autoclaving process or the like may also be performed. In this case, as illustrated in  FIG. 10B , the air gap  54  may be reduced even further. Consequently, the optical film  21  may be applied favorably to adherends having a variety of surface shapes. In other words, in addition to a flat, planar object such as a liquid crystal display, the optical film  21  may also be applied favorably to a transparent substrate having a step, such as a touch panel having a bezel part, for example, a wearable terminal, a head-mounted display, a protective plate for an in-vehicle display having a curved surface, a show window, or the like. 
     &lt;5. Configuration of First Master&gt; 
     The third concave-convex structure  15  is produced using the first master  30  illustrated in  FIG. 3A , for example. Accordingly, the configuration of the first master  30  will be described next. The first master  30  is a master used in a nanoimprint method, and has a hollow round cylindrical shape, for example. The first master  30  may also have a round columnar shape, or another shape (for example, a planar shape). However, if the first master  30  has a round columnar or hollow round cylindrical shape, a fourth concave-convex structure  32  of the first master  30  may be transferred seamlessly to a resin base material or the like with a roll-to-roll method. Consequently, the master film  10  with the fourth concave-convex structure  32  of the first master  30  transferred thereonto may be produced with high production efficiency. From such a perspective, the shape of the first master  30  is preferably a hollow round cylindrical shape or a round columnar shape. 
     The first master  30  is provided with a master base material  31 , and a fourth concave-convex structure  32  formed on the surface of the master base material  31 . The master base material  31  is a glass body, for example, and specifically is formed from quartz glass. However, the master base material  31  is not particularly limited insofar as the SiO 2  purity is high, and may also be formed from a material such as fused quartz glass or synthetic quartz glass. The shape of the master base material  31  is a hollow round cylindrical shape, but may also be a round columnar shape, or some other shape. However, as described above, the master base material  31  preferably has a hollow round cylindrical shape or a round columnar shape. The fourth concave-convex structure  32  has the reverse shape of the third concave-convex structure  15 . 
     &lt;6. Configuration of Second Master&gt; 
     The second concave-convex structure  26  is produced using the second master  40  illustrated in  FIG. 3B , for example. Accordingly, the configuration of the second master  40  will be described next. The second master  40  is a master used in a nanoimprint method, and has a hollow round cylindrical shape, for example. The second master  40  may also have a round columnar shape, or another shape (for example, a planar shape). However, if the second master  40  has a round columnar or hollow round cylindrical shape, a fifth concave-convex structure  42  of the second master  40  may be transferred seamlessly to a resin base material or the like with a roll-to-roll method. Consequently, the optical film  21  with the fifth concave-convex structure  42  of the second master  40  transferred thereonto may be produced with high production efficiency. From such a perspective, the shape of the second master  40  is preferably a hollow round cylindrical shape or a round columnar shape. 
     The second master  40  is provided with a master base material  41 , and a fifth concave-convex structure  42  formed on the surface of the master base material  41 . The master base material  41  is a glass body, for example, and specifically is formed from quartz glass. However, the master base material  41  is not particularly limited insofar as the SiO 2  purity is high, and may also be formed from a material such as fused quartz glass or synthetic quartz glass. The shape of the master base material  41  is a hollow round cylindrical shape, but may also be a round columnar shape, or some other shape. However, as described above, the master base material  41  preferably has a hollow round cylindrical shape or a round columnar shape. The fifth concave-convex structure  42  has the reverse shape of the second concave-convex structure  26 . 
     &lt;6. Method of Manufacturing Master&gt; 
     Next, a method of manufacturing the first master  30  will be described. Note that the second master  40  may also be manufactured by a process similar to the first master  30 . First, a base material resist layer is formed (deposited) on the master base material  31 . At this point, the resist constituting the base material resist layer is not particularly limited, and may be either an organic resist or an inorganic resist. Examples of organic resists include novolac-type resist and chemically-amplified resist. Also, examples of inorganic resists include metallic oxides including one or multiple types of transition metals such as tungsten (W) or molybdenum (Mo). However, in order to conduct thermal reaction lithography, the base material resist layer preferably is formed with a thermo-reactive resist including a metallic oxide. 
     In the case of using an organic resist, the base material resist layer may be formed on the master base material  31  by using a process such as spin coating, slit coating, dip coating, spray coating, or screen printing. Also, in the case of using an inorganic resist for the base material resist layer, the base material resist layer may be formed by sputtering. 
     Next, by exposing part of the base material resist layer with an exposure device  200  (see  FIG. 3I ), a latent image is formed on the base material resist layer. Specifically, the exposure device  200  modulates laser light  200 A, and irradiates the base material resist layer with the laser light  200 A. Consequently, part of the base material resist layer irradiated by the laser light  200 A denatures, and thus a latent image corresponding to the fourth concave-convex structure  32  may be formed in the base material resist layer. The latent image is formed in the base material resist layer at an average period less than or equal to the visible light wavelengths. 
     Next, by dripping a developing solution onto the base material resist layer in which is formed the latent image, the base material resist layer is developed. As a result, a concave-convex structure is formed in the base material resist layer. Subsequently, by etching the master base material  31  and the base material resist layer using the base material resist layer as a mask, the fourth concave-convex structure  32  is formed on the master base material  31 . Note that although the etching method is not particularly limited, dry etching that is vertically anisotropic is preferable. For example, reactive ion etching (RIE) is preferable. By the above steps, the first master  30  is produced. Note that anodic porous alumina obtained by the anodic oxidation of aluminum may also be used as the master. Anodic porous alumina is disclosed in WO 2006/059686, for example. 
     &lt;7. Configuration of Exposure Device&gt; 
     Next, the configuration of the exposure device  200  will be described on the basis of  FIG. 3I . The exposure device  200  is a device that exposes the base material resist layer. The exposure device  200  is provided with a laser light source  201 , a first mirror  203 , a photodiode (PD)  205 , a deflecting optical system, a control mechanism  230 , a second mirror  213 , a movable optical table  220 , a spindle motor  225 , and a turntable  227 . Also, the master base material  31  is placed on the turntable  227  and able to be rotated. 
     The laser light source  201  is a light source that emits laser light  200 A, and is a device such as a solid-state laser or a semiconductor laser, for example. The wavelength of the laser light  200 A emitted by the laser light source  201  is not particularly limited, but may be a wavelength in the blue light band from 400 nm to 500 nm, for example. Also, it is sufficient for the spot diameter of the laser light  200 A (the diameter of the spot radiated onto the resist layer) to be smaller than the diameter of the open face of a concavity of the fourth concave-convex structure  32 , such as approximately 200 nm, for example. The laser light  200 A emitted from the laser light source  201  is controlled by the control mechanism  230 . 
     The laser light  200 A emitted from the laser light source  201  advances directly in a collimated beam, reflects off the first mirror  203 , and is guided to the deflecting optical system. 
     The first mirror  203  is made up of a polarizing beam splitter, and has a function of reflecting one polarized component, and transmitting the other polarized component. The polarized component transmitted through the first mirror  203  is sensed by the photodiode  205  and photoelectrically converted. Also, the photodetection signal photoelectrically converted by the photodiode  205  is input into the laser light source  201 , and the laser light source  201  conducts phase modulation of the laser light  200 A on the basis of the input photodetection signal. 
     In addition, the deflecting optical system is provided with a condenser lens  207 , an electro-optic deflector (EOD)  209 , and a collimator lens  211 . 
     In the deflecting optical system, the laser light  200 A is condensed onto the electro-optic deflector  209  by the condenser lens  207 . The electro-optic deflector  209  is an element capable of controlling the radiation position of the laser light  200 A. With the electro-optic deflector  209 , the exposure device  200  is also able to vary the radiation position of the laser light  200 A guided onto the movable optical table  220 . After the radiation position is adjusted by the electro-optic deflector  209 , the laser light  200 A is converted back into a collimated beam by the collimator lens  211 . The laser light  200 A exiting the deflecting optical system is reflected by the second mirror  213 , and guided level with and parallel to the movable optical table  220 . 
     The movable optical table  220  is provided with a beam expander (BEX)  221  and an objective lens  223 . The laser light  200 A guided to the movable optical table  220  is shaped into a desired beam shape by the beam expander  221 , and then radiated via the objective lens  223  onto the base material resist layer formed on the master base material  31 . In addition, the movable optical table  220  moves by one feed pitch (track pitch) in the direction of the arrow R (feed pitch direction) every time the master base material  31  undergoes one rotation. The master base material  31  is placed on the turntable  227 . The spindle motor  225  causes the turntable  227  to rotate, thereby causing the master base material  31  to rotate. 
     In addition, the control mechanism  230  is provided with a formatter  231  and a driver  233 , and controls the radiation of the laser light  200 A. The formatter  231  generates a modulation signal that controls the radiation of the laser light  200 A, and the driver  233  controls the laser light source  201  on the basis of the modulation signal generated by the formatter  231 . As a result, the irradiation of the master base material  31  by the laser light  200 A is controlled. 
     The formatter  231  generates a control signal for irradiating the base material resist layer with the laser light  200 A, on the basis of an input image depicting an arbitrary pattern to draw on the base material resist layer. Specifically, first, the formatter  231  acquires an input image depicting an arbitrary pattern to draw on the base material resist layer. The input image is an image corresponding to a development of the outer circumferential surface of the base material resist layer, in which the outer circumferential surface of the base material resist layer is cut in the axial direction and expanded in a single plane. Next, the formatter  231  partitions the input image into sub-regions of a certain size (for example, partitions the input image into a lattice), and determines whether or not the draw pattern is included in each of the sub-regions. Subsequently, the formatter  231  generates a control signal to perform control to irradiate with the laser light  200 A each sub-region determined to include the draw pattern. Furthermore, the driver  233  controls the output of the laser light source  201  on the basis of the control signal generated by the formatter  231 . As a result, the irradiation of the base material resist layer by the laser light  200 A is controlled. 
     &lt;8. Method of Manufacturing Master Film and Optical Film&gt; 
     Next, a method of manufacturing the master film  10  and the optical film  21  will be described. 
     (Step  1 ) 
     In Step  1 , as illustrated in  FIG. 3C , an uncured resin layer  11   p  for the master film is formed on the base material film  12 . At this point, the uncured resin layer  11   p  for the master film is made of an uncured curing resin or the like. Herein, the curing resin is as described earlier. The release agent or the like described earlier may also be added to the uncured resin layer  11   p  for the master film. Next, the uncured resin layer  11   p  for the master film is put in close contact with the fourth concave-convex structure  32  of the first master  30 . As a result, the fourth concave-convex structure  32  is transferred to the uncured resin layer  11   p  for the master film. 
     (Step  2 ) 
     In Step  2 , as illustrated in  FIG. 3D , the uncured resin layer  11   p  for the master film is cured. As a result, the concave-convex resin layer  11  is formed on the base material film  12 . In other words, the master film  10  is produced. In the example of  FIG. 3D , the uncured resin layer  11   p  for the master film is cured by irradiating the uncured resin layer  11   p  for the master film with ultraviolet rays (UV light). Consequently, in this example, the uncured resin layer  11   p  for the master film is made of an ultraviolet-curing resin or the like. Next, as illustrated in  FIG. 3E , the master film  10  is separated from the first master  30 . On the surface of the third concave-convex structure  15 , an inorganic film  16  as illustrated in  FIG. 3L  may be formed. 
     Note that Step  1  and Step  2  may also be conducted continuously by what is called a roll-to-roll transfer device. Hereinafter, a detailed configuration of a transfer device  300  will be described on the basis of  FIG. 3J . The transfer device  300  illustrated in  FIG. 3J  is a roll-to-roll transfer device using the first master  30 . The master film  10  may be produced by using such a transfer device  300 . Note that in the transfer device  300 , the master film  10  is produced using a light-curing resin. Obviously, the master film  10  may also be produced using another type of curing resin. 
     The transfer device  300  is provided with the first master  30 , a base material supply roll  301 , a take-up roll  302 , guide rolls  303  and  304 , a nip roll  305 , a separation roll  306 , an applicator device  307 , and an energy source  309 . 
     The base material supply roll  301  is an elongated roll around which the base material film  12  is wound in a roll, while the take-up roll  302  is a roll that takes up the master film  10 . Also, the guide rolls  303  and  304  are rolls that transport the base material film  12 . The nip roll  305  is a roll that puts the base material film  12  laminated with uncured resin layer  11   p  for the master film, or in other words a transfer film  100 , in close contact with the first master  30 . The separation roll  306  is a roll that separates the base material film  12  on which is formed the concave-convex resin layer  11 , or in other words the master film  10 , from the first master  30 . 
     The applicator device  307  is provided with an applicating means such as a coater, and applies an uncured light-curing resin to the base material film  12 , and forms the uncured resin layer  11   p  for the master film. The applicator device  307  may be a device such as a gravure coater, a wire bar coater, or a die coater, for example. Also, the energy source  309  is a light source that emits light of a wavelength able to cure the light-curing resin, and may be a device such as an ultraviolet lamp, for example. 
     In the transfer device  300 , first, the base material film  12  is sent continuously from the base material supply roll  301  via the guide roll  303 . Note that partway through the delivery, the base material supply roll  301  may also be changed to a base material supply roll  301  of a separate lot. The uncured light-curing resin is applied by the applicator device  307  to the delivered base material film  12 , and the uncured resin layer  11   p  for the master film is laminated onto the base material film  12 . As a result, the transfer film  100  is produced. The transfer film  100  is put into close contact with the first master  30  by the nip roll  305 . As a result, the fourth concave-convex structure  32  of the first master  30  is transferred to the uncured resin layer  11   p  for the master film. The energy source  309  is provided on the outside of the first master  30 . Subsequently, the energy source  309  irradiates with light the uncured resin layer  11   p  for the master film put in close contact with the first master  30 , thereby curing the uncured resin layer  11   p  for the master film. As a result, the concave-convex resin layer  11  is formed on the base material film  12 . Next, the base material film  12  on which is formed the concave-convex resin layer  11 , or in other words the master film  10 , is separated from the first master  30  by the separation roll  306 . Next, the master film  10  is taken up by the take-up roll  302  via the guide roll  304 . 
     In this way, in the transfer device  300 , the circumferential shape of the first master  30  is transferred to the transfer film  100  while transporting the transfer film  100  roll-to-roll. As a result, the master film  10  is produced. 
     Note that in the case of preparing the master film  10  with a thermosetting resin, the applicator device  307  and the energy source  309  become unnecessary. Also, the base material film  12  is taken to be a thermoplastic resin film, and a heater device is disposed farther upstream than the first master  30 . The base material film  12  is heated and softened by the heater device, and after that, the base material film  12  is pressed against the first master  30 . As a result, the fourth concave-convex structure  32  formed on the circumferential face of the first master  30  is transferred to the base material film  12 . In this case, the base material film  12  and the concave-convex resin layer  11  become a solid cast. Note that the base material film  12  may also be taken to be a film made up of a resin other than a thermoplastic resin, in which the base material film  12  and a thermoplastic resin film are laminated. In this case, the laminated film is pressed against the first master  30  after being heated by the heater device. 
     Consequently, the transfer device  300  is able to continuously produce a transfer product to which has been transferred the fourth concave-convex structure  32  of the first master  30 , in other words, the master film  10 . Herein, the fourth concave-convex structure  32  formed on the circumferential face of the first master  30  has the desired average period. Consequently, the third concave-convex structure  15  formed on the master film  10  has the desired average period. 
     (Step  3 ) 
     In Step  3 , as illustrated in  FIG. 3F , an uncured resin layer  21   p  for the optical film is formed on the third concave-convex structure  15 . As a result, the third concave-convex structure  15  is transferred to the uncured resin layer  21   p  for the optical film. 
     At this point, it is sufficient for the uncured resin layer  21   p  for the optical film to be made of a similar material as the uncured resin layer  11   p  for the master film. However, the specific material of the uncured resin layers  11   p  for the master film and the uncured resin layers  21   p  for the optical film is selected so that the concave-convex resin layer  11  and the optical film  21  are separable. Additionally, the method of forming the uncured resin layer  21   p  for the optical film on the third concave-convex structure  15  is not particularly limited, and may be, for example, a method of dripping an uncured curing resin onto the third concave-convex structure  15  with a dropper, or as described later, a method using a device such as a gravure coater, a wire bar coater, or a die coater. Next, the uncured resin layer  21   p  for the optical film is put in close contact with the fifth concave-convex structure  42  of the second master  40 . As a result, the fifth concave-convex structure  42  is transferred to the uncured resin layer  21   p  for the optical film. 
     (Step  4 ) 
     Next, in Step  4 , as illustrated in  FIG. 3G , the uncured resin layer  21   p  for the optical film is cured. As a result, the second concave-convex structure  26  is formed on the optical film  21 . In the example of  FIG. 3G , the uncured resin layer  21   p  for the optical film is cured by irradiating the uncured resin layer  21   p  for the optical film with ultraviolet rays (UV light). Consequently, in this example, the uncured resin layer  21   p  for the optical film is made of an ultraviolet-curing resin or the like. Next, as illustrated in  FIG. 3H , the optical film  21  is separated from the second master  40 . 
     Note that in the present embodiment, a concave-convex structure is formed on both the front and back sides of the optical film  21 . For this reason, both an anchor effect on the master film  10  and an anchor effect on the second master  40  are produced. Additionally, in the case where the anchor effect on the second master  40  is excessively greater than the anchor effect on the master film  10 , the following problem may occur. Namely, when peeling the optical film  21  away from the second master  40 , there is a possibility that instead of the second master  40  peeling away from the optical film  21 , the master film  10  may peel away from the optical film  21 . For this reason, as described earlier, the aspect ratio of the second concave-convex structure  26  is preferably smaller than the aspect ratio of the first concave-convex structure  25 . 
     (Step  5 ) 
     Next, as illustrated in  FIG. 1 , the adhesive layer  23  is formed on top of the second concave-convex structure  26 . For example, an adhesive tape is applied on top of the second concave-convex structure  26 . As a result, the optical body  1  is produced. 
     Note that Step  3  and Step  4  may also be conducted continuously by what is called a roll-to-roll transfer device. Hereinafter, a detailed configuration of a transfer device  400  will be described on the basis of  FIG. 3K . Note that since the transfer device  400  has a configuration mostly similar to the transfer device  300 , only the different points will be described herein. 
     The transfer device  400  transports the master film  10  instead of the base material film  12 . In other words, the base material supply roll  301  is a roll around which the master film  10  is wound in a roll, while the take-up roll  302  is a roll that takes up the master film  10  on which the optical film  21  is formed. The guide rolls  303  and  304  are rolls that transport the master film  10 . The nip roll  305  is a roll that puts the master film  10  laminated with uncured resin layer  21   p  for the optical film, or in other words a transfer film  100 , in close contact with the second master  40 . The separation roll  306  is a roll that separates the optical film  21  on which is formed the second concave-convex structure  26  from the second master  40 . The applicator device  307  applies an uncured light-curing resin to the master film  10 , and forms the uncured resin layer  21   p  for the optical film. 
     In the transfer device  400 , first, the master film  10  is sent continuously from the base material supply roll  301  via the guide roll  303 . Note that partway through the delivery, the base material supply roll  301  may also be changed to a base material supply roll  301  of a separate lot. The uncured light-curing resin is applied by the applicator device  307  to the delivered master film  10 , and the uncured resin layer  21   p  for the optical film is laminated onto the master film  10 . As a result, the transfer film  100  is produced. The transfer film  100  is put into close contact with the second master  40  by the nip roll  305 . As a result, the fifth concave-convex structure  42  of the second master  40  is transferred to the uncured resin layer  21   p  for the optical film. The energy source  309  is provided on the outside of the second master  40 . Subsequently, the energy source  309  irradiates with light the uncured resin layer  21   p  for the optical film put in close contact with the second master  40 , thereby curing the uncured resin layer  21   p  for the optical film. As a result, the second concave-convex structure  26  is formed on the optical film  21 . Next, the optical film  21  on which is formed the second concave-convex structure  26 , is separated from the second master  40  by the separation roll  306 . Next, the master film  10  and the optical film  21  are taken up by the take-up roll  302  via the guide roll  304 . 
     In this way, in the transfer device  400 , the circumferential shape of the second master  40  is transferred to the transfer film  100  while transporting the transfer film  100  roll-to-roll. As a result, the second concave-convex structure  26  is formed on the optical film  21 . In the transfer device  400 , the optical film  21  likewise may be manufactured using a thermoplastic resin. 
     &lt;9. Optical Body Usage Method&gt; 
     (First Usage Method) 
     Next, a first usage method of the optical body  1  will be described on the basis of  FIGS. 4A and 4B . In this usage method, the adhesive layer  23  is applied to the optical body  1 . As illustrated in  FIG. 4A , first, the adhesive layer  23  of the optical body  1  is applied to the surface of an adherend  500 . The master film  10  is able to protect the first concave-convex structure  25  of the optical film  21 . For example, the master film  10  is able to prevent contact, friction, and the like between the first concave-convex structure  25  and another object. Next, as illustrated in  FIG. 4B , only the master film  10  is peeled away from the optical body  1 . At this point, since the master film  10  is formed from a cured curing resin, residual debris or the like from the master film  10  is unlikely to remain on the first concave-convex structure  25  of the optical film  21 . Furthermore, since the optical film  21  may be made thinner, after the master film  10  is peeled away from the optical body  1 , the optical film  21  is able to conform to surface concavities and convexities easily. Also, the master film  10  is usable as an anti-reflective film or the like. Note that the type of the adherend  500  is not particularly limited. For example, the adherend  500  may be any of various types of optical devices (optical components), display elements, and input elements. The adherend  500  may be an object such as a camera, a display, a projector, a telescope, a touch panel, a wearable terminal, a head-mounted display, an in-vehicle display, or a show window, for example. 
     Particularly, the optical film  21  is able to conform to the surface shape of the adherend  500  even if the surface shape of the adherend  500  is distorted (having concavities and convexities or having a curved face, for example). The optical body  1  may be used as an anti-reflective film for these optical devices. Obviously, the optical body  1  may also be applied to another adherend  500 . 
     (Second Usage Method) 
     Next, a second usage method of the optical body  1  will be described on the basis of  FIGS. 5A to 5C . In this usage method, the adhesive layer  23  is not applied to the optical body  1 . As illustrated in  FIG. 5A , first, an uncured adhesive layer  23   b  is formed on the surface of the adherend  500 . The type of adhesive agent constituting the adhesive layer  23   b  does not particularly matter, and may be similar to the adhesive agent constituting the adhesive layer  23 , for example. Next, as illustrated in  FIG. 5B , the optical body  1  is applied to the adhesive layer  23   b . Next, by curing the adhesive layer  23   b , the adhesive layer  23   b  becomes a cured layer  23 B. For example, the adhesive layer  23   b  may be cured by irradiating the adhesive layer  23   b  with ultraviolet rays. In this case, the adhesive layer  23   b  is made of a light-curing resin. Next, as illustrated in  FIG. 5C , only the master film  10  is peeled away from the optical body  1 . 
     As above, according to the present embodiment, the first concave-convex structure  25  of the optical film  21  is protected by the master film  10 , and thus a protective film becomes unnecessary. Furthermore, the master film  10  is made up of a cured curing resin. For this reason, when the master film  10  is peeled away from the optical film  21 , residual debris or the like from the master film  10  is unlikely to remain on the first concave-convex structure  25  of the optical film  21 . Furthermore, since the optical body  1  is able to gain thickness due to the master film  10 , the handling properties of the optical body  1  may be improved while also making the optical film  21  thinner. Furthermore, the optical film includes a second concave-convex structure. For this reason, the adhesive strength between the optical film and the adhesive layer increases due to the anchor effect provided by the second concave-convex structure. Consequently, the optical film may be applied more firmly to the adherend. 
     EXAMPLES 
     Hereinafter, the present invention will be described more specifically using Examples. 
     Example 1 
     In Example 1, the optical body  1  was produced according to the following steps. As the base material film  12 , a PET film with a thickness of 50 μm was prepared. Additionally, as the light-curing resin, an ultraviolet-curing acrylic resin (Dexerials Corp., SK1100 series) to which a silicone-based release agent (BYK, silicone lubricant BYK-333) was added was prepared. Subsequently, by coating the base material film  12  with the light-curing resin, the uncured resin layer  11   p  for the master film was formed on the base material film  12 . Meanwhile, the first master  30  was produced using the exposure device  200  described earlier. Next, by pressing the uncured resin layer  11   p  for the master film against the circumferential surface of the first master  30 , the fourth concave-convex structure  32  formed on the circumferential surface of the first master  30  was transferred to the uncured resin layer  11   p  for the master film. Next, by curing the uncured resin layer  11   p  for the master film, the concave-convex resin layer  11  was produced. In other words, the master film  10  was produced. 
     At this point, the thickness of the concave-convex resin layer  11  was taken to be approximately 3 μm. Also, the third convexities  15   a  and the third concavities  15   b  of the third concave-convex structure  15  were arranged in a staggered lattice. Also, the shapes of the third convexities  15   a  were taken to be bullet-shaped, the height L 1  of the third convexities  15   a  was taken to be approximately 200 nm, the dot pitch L 2  was taken to be approximately 270 nm, and the track pitch L 3  was taken to be approximately 153 nm. Note that the surface shape of the third concave-convex structure  15  was confirmed with a scanning electronic microscope (SEM). 
     Meanwhile, as the light-curing resin used for the optical film  21 , an ultraviolet-curing resin was prepared in which a modified diacrylate with few functional groups (Toagosei Co., M260) was added to a multifunctional special acrylate (Dexerials Corp., SK1100 series). In other words, in Example 1, a modified diacrylate with few functional groups was added to an ultraviolet-curing resin to make the elastic modulus of the optical film  21  lower than the elastic modulus of the concave-convex resin layer  11 . Furthermore, in consideration of the separability of the optical film  21  and the master film  10 , a silicone-based release agent (BYK, product name: Silicone Lubricant BYK-333) was also added to the light-curing resin that forms the optical film  21 . 
     Subsequently, by coating the third concave-convex structure  15  of the master film  10  with the light-curing resin, the uncured resin layer  21   p  for the optical film was formed on the third concave-convex structure  15 . As a result of this step, the third concave-convex structure  15  was transferred to the uncured resin layer  21   p  for the optical film. In other words, the first concave-convex structure  25  was formed on the optical film  21 . The first concave-convex structure  25  had the reverse shape of the third concave-convex structure  15 . The aspect ratio of the first concave-convex structure  25  was taken to be 1.3. Meanwhile, the second master  40  was produced using the exposure device  200  described earlier. Next, by pressing the uncured resin layer  21   p  for the optical film against the circumferential surface of the second master  40 , the fifth concave-convex structure  42  formed on the circumferential surface of the second master  40  was transferred to the uncured resin layer  21   p  for the optical film. Next, by curing the uncured resin layer  21   p  for the optical film, the second concave-convex structure  26  was formed on the optical film  21 . Note that the second convexities  26   a  and the second concavities  26   b  of the second concave-convex structure  26  were arranged in a staggered lattice. Also, the shapes of the second convexities  26   a  were taken to be bullet-shaped, the height L 1  of the second convexities  26   a  was taken to be approximately 130 nm, and the dot pitch L 2  and the track pitch L 3  were taken to be similar to the first concave-convex structure  25  and the third concave-convex structure  15 . Also, the aspect ratio of the second concave-convex structure  26  was taken to be 0.62. Consequently, the aspect ratio of the second concave-convex structure  26  was made smaller than the aspect ratio of the first concave-convex structure  25 . Note that the surface shape of the second concave-convex structure  26  was confirmed with a scanning electronic microscope (SEM). 
     At this point, the thickness of the optical film  21  was taken to be approximately 3 μm. Also, the elastic modulus of the master film  10  (specifically, the elastic modulus of the concave-convex resin layer  11 ) and the elastic modulus of the optical film  21  were measured by a dynamic viscoelasticity measuring apparatus (DMA) (TA Instruments Rheometrics System Analyzer-3 (RSA-3)). The result was that the elastic modulus of the master film  10  was 2710 MPa, while the elastic modulus of the optical film  21  was 1300 MPa. Next, as the adhesive layer  23 , an optically clear adhesive tape (OCA tape) with a thickness of 25 μm (acrylic adhesive material, product name: FW25, Nichiei Kakoh Co., Ltd.) was applied to the optical film  21 . By the above steps, the optical body  1  was produced. 
     The spectral reflection spectrum of the master film  10  was measured according to the following steps. Namely, as illustrated in  FIG. 6A , a black polyethylene terephthalate (PET) plate  501  was applied by OCA tape to the other surface of the master film  10  (the surface on the side on which the concave-convex structure  11  was not formed). In other words, reflections from the other surface of the master film  10  could be cancelled. Subsequently, the spectral specular reflection spectrum at the third concave-convex structure  15  was measured. The spectral specular reflection spectrum was measured using a spectrophotometer (model number V-550 with absolute reflectance measuring unit attached, JASCO Corporation). Also, the angle of incidence and the angle of reflection were both taken to be 5°, the wavelength range was taken to be from 350 nm to 800 nm, and the wavelength resolution was taken to be 1 nm. As a result, the spectral reflectance was confirmed to take a value from 0.1% to 1.5%. 
     The spectral reflection spectrum of the optical film  21  was measured according to the following steps. Namely, as illustrated in  FIG. 6B , the optical body  1  is applied to a glass adherend  502  by the adhesive layer  23 , and only the master film  10  is peeled away. At this point, the optical film  21  did not separate from the adherend  502 . Furthermore, on the other surface of the adherend  502  (the surface on the side on which the optical film  21  was not applied), the black PET plate  503  was applied by OCA tape. Consequently, reflections from the other surface of the adherend  502  could be cancelled. By the above steps, an optical film adhesive body was produced. Subsequently, the spectral specular reflection spectrum at the first concave-convex structure  25  was measured. The specific measuring method was taken to be similar to that of the master film  10 . 
     Additionally, simulation software (TFCalc, HULINKS Inc.) was used to calculate the spectral reflection spectrum of the optical film  21 . Specifically, the parameters of the optical film  21  were input into the simulation software. At this point, the refractive index of the optical film  21  was taken to be 1.53, the refractive index of the adhesive layer  23  was taken to be 1.65, and the refractive index of the adherend  502  was taken to be 1.65. Additionally, the first concave-convex structure  25  was taken to be bullet-shaped in the depth direction as obtained by a second-order function, and to be provided with a pitch less than or equal to the visible light wavelengths. Also, the first concave-convex structure  25  of the optical film  21  was modeled as a multilayer film with 10 layers. Each layer was approximated by dividing the height of the concavities and convexities by 10. Also, the angle of incidence and the angle of reflection were both taken to be 5°, and the wavelength range was taken to be from 350 nm to 800 nm. 
     The results of the simulation are illustrated in  FIG. 7A . As  FIG. 7A  clearly demonstrates, the spectral reflectance of the optical film  21  (for wavelengths from 350 nm to 800 nm) is from 0.1% to 1.8%. Note that the spectral reflectance actually measured using a spectrophotometer yielded mostly similar results. Note that in  FIGS. 7A to 7C , the horizontal axis represents the wavelength, while the vertical axis represents the spectral reflectance (specular reflectance). 
     Comparative Example 1a 
     An optical body was produced by following similar steps as Example 1, except that the surface on the adhesive layer side of the optical film  21  was made flat. Additionally, an optical film adhesive body was produced by following similar steps as Example 1. Next, simulation software (TFCalc, HULINKS Inc.) was used to calculate the spectral reflection spectrum of the optical film adhesive body. The measurement conditions were similar to Example 1. The results are illustrated in  FIG. 7A . In Comparative Example 1a, to the extent that the second concave-convex structure  26  was not formed, the spectral reflectance rose slightly, and ripples were observed. Consequently, it was concluded that the second concave-convex structure  26  in which the average period of the concavities and convexities is less than or equal to the visible light wavelengths is preferably formed on the optical film  21 . 
     Comparative Example 1b 
     An optical body was produced by following similar steps as Example 1, except that the surface on both sides of the optical film  21  was made flat. Additionally, an optical film adhesive body was produced by following similar steps as Example 1. Next, simulation software (TFCalc, HULINKS Inc.) was used to calculate the spectral reflection spectrum of the optical film adhesive body. The measurement conditions were similar to Example 1. The results are illustrated in  FIG. 7A . In Comparative Example 1b, since neither the first concave-convex structure  25  nor the second concave-convex structure  26  was formed on the optical film  21 , the spectral reflectance rose greatly. Specifically, the spectral reflectance became a value of approximately 6%. 
     Example 2 
     The spectral reflection spectrum of the optical film adhesive body was calculated by conducting a process similar to Example 1, except that the refractive index of the adhesive layer  23  was taken to be 1.7 and the refractive index of the adherend  502  was taken to be 1.7. The results are illustrated in  FIG. 7B . In Example 2, results mostly similar to Example 1 are likewise obtained. 
     Comparative Example 2a 
     The spectral reflection spectrum of the optical film adhesive body was calculated by conducting a process similar to Example 2, except that the surface on the adhesive layer side of the optical film  21  was made flat. The results are illustrated in  FIG. 7B . In Comparative Example 2a, results mostly similar to Comparative Example 1a are obtained. 
     Comparative Example 2b 
     The spectral reflection spectrum of the optical film adhesive body was calculated by conducting a process similar to Example 2, except that the surface on both sides of the optical film  21  was made flat. The results are illustrated in  FIG. 7B . In Comparative Example 2b, results mostly similar to Comparative Example 1b are obtained. However, the spectral reflectance rose further to become a value close to 7%. 
     Example 3 
     The spectral reflection spectrum of the optical film adhesive body was calculated by conducting a process similar to Example 1, except that the refractive index of the adhesive layer  23  was taken to be 1.75 and the refractive index of the adherend  502  was taken to be 1.75. The results are illustrated in  FIG. 7C . In Example 3, results mostly similar to Example 1 are likewise obtained. 
     Comparative Example 3a 
     The spectral reflection spectrum of the optical film adhesive body was calculated by conducting a process similar to Example 3, except that the surface on the adhesive layer side of the optical film  21  was made flat. The results are illustrated in  FIG. 7C . In Comparative Example 3a, results mostly similar to Comparative Example 1a are obtained. 
     Comparative Example 3b 
     The spectral reflection spectrum of the optical film adhesive body was calculated by conducting a process similar to Example 3, except that the surface on both sides of the optical film  21  was made flat. The results are illustrated in  FIG. 7C . In Comparative Example 3a, results mostly similar to Comparative Example 1a are obtained. However, the spectral reflectance rose further, and exceeded 7%. Consequently, in Comparative Examples 1b, 2b, and 3b, the spectral reflectance became approximately from 6% to 8%. 
     Example 4 
     The spectral reflection spectrum of the film adhesive body was calculated by conducting a process similar to Example 1, except that the height of the first convexities  25   a  of the optical film  21  was taken to be 220 nm, and the height of the second convexities  26   a  was taken to be 200 nm. The results are illustrated in  FIG. 8 . As illustrated in  FIG. 8 , in Example 4, results mostly similar to Example 1 are likewise obtained. 
     Comparative Example 4 
     The spectral reflection spectrum of the film adhesive body was calculated by conducting a process similar to Example 1, except that the height of the first convexities  25   a  of the optical film  21  was taken to be 220 nm, and the surface of the adhesive layer side was made flat. The results are illustrated in  FIG. 8 . In Comparative Example 4, to the extent that the second concave-convex structure  26  was not formed, the spectral reflectance rose slightly, and ripples were observed. Note that  FIG. 8  also illustrates the calculation results from Comparative Example 1b. 
     Example 5 
     The spectral reflection spectrum of the film adhesive body was calculated by conducting a process similar to Example 1, except that the height of the first convexities  25   a  of the optical film  21  was taken to be 220 nm, and the height of the second convexities  26   a  was taken to be 100 nm. The results are illustrated in  FIG. 8 . As illustrated in  FIG. 8 , in Example 5, slight ripples were observed, but the ripples were smaller than the ripples of Comparative Example 4. 
     Consequently, it was concluded that the second concave-convex structure  26  in which the average period of the concavities and convexities is less than or equal to the visible light wavelengths is preferably formed on the optical film  21 . It was also concluded that the second concave-convex structure  26  preferably has a shape that is comparable with the first concave-convex structure  25 . 
     Example 6 
     In Example 6, the optical body  1  similar to Example 1 was produced. Next, a silicon adhesive agent that acted as a light-curing adhesive agent (Shin-Etsu Chemical Co., KER2500) was used to coat a white plate glass (coat thickness from 0.005 mm to 0.01 mm). Next, the optical film  21  of the optical body  1  was applied to the silicone adhesive layer. Next, the silicone adhesive layer was cured. Next, the master film  10  was peeled away. As a result, a white plate glass with the optical film applied thereto was obtained. 
     In Example 6, the light-resistance of the white plate glass with the optical film applied thereto was examined. Specifically, light was radiated under the following conditions from the optical film  21  side of the white plate glass with the optical film applied thereto. Additionally, before and after the light radiation, the spectral transmittance of the white plate glass with the optical film applied thereto was measured with a V-560 spectrophotometer and an absolute reflectance measuring unit ARV-474S from JASCO Corporation. 
     Light Radiation Conditions
         Light source: ultraviolet LED lamp (wavelength 385 nm)   Intensity: 1000 mW/cm 2      Distance between light source and white plate glass with optical film applied thereto: 2 cm   Radiation time: 2 hours       

     Additionally, as an optical film according to a control (I), a cyclo-olefin polymer (COP) film (Zeon Corporation, ZF14) (thickness 100 μm) was prepared. Furthermore, the silicone adhesive agent used in Example 6 was used to coat the surface of a white plate glass with at a coat thickness of 0.01 mm and then light-cured, thereby preparing an optical film according to a control (II). Subsequently, the spectral transmittance of these optical films was measured similarly. 
     The results are illustrated in  FIG. 9 . In  FIG. 9 , the horizontal axis represents the wavelength, while the vertical axis represents the diffuse transmittance (spectral transmittance). According to  FIG. 9 , the optical body  1  does not undergo great variations in transmittance before and after being irradiated with ultraviolet rays, and maintains a high transmittance, thus demonstrating better light resistance than the COP film (control (I)) and the optical film with a cured silicone adhesive agent (control (II)), which are typically considered to have excellent optical properties. 
     (Application Test) 
     A frame body with a height of 50 μm was attached to the surface of a glass substrate to thereby produce the adherend. Subsequently, the optical body  1  produced in Example 1 was attached to the adherend, and after that, the master film  10  was peeled away. Also, a similar adherend was produced, and the master film  10  was attached to the adherend by OCA tape. In other words, a film adhesive body to which was applied the optical film  21 , and a film adhesive body to which was applied the master film  10 , were produced. Subsequently, these film adhesive bodies were observed visually. As a result, in the film adhesive body to which was applied the optical film  21 , almost no air gap  54  was observed at the perimeter of the frame body. However, in the film adhesive body to which was applied the master film  10 , a large air gap  54  was observed in numerous places at the perimeter of the frame body. 
     Furthermore, an autoclaving process (conditions: 50° C. and +0.5 atm, maintained for 0.5 h) was conducted on each film adhesive body. Subsequently, the film adhesive bodies after the autoclaving process were observed visually. As a result, in the film adhesive body to which was applied the optical film  21 , it was confirmed that the air gap  54  had disappeared. On the other hand, in the film adhesive body to which was applied the master film  10 , there was no change in the distribution of the air gap  54 . In other words, a large air gap  54  was still observed in numerous places. 
     The preferred embodiment(s) of the present invention has/have been described above with reference to the accompanying drawings, whilst the present invention is not limited to the above examples. A person skilled in the art may find various alterations and modifications within the scope of the appended claims, and it should be understood that they will naturally come under the technical scope of the present invention. 
     INDUSTRIAL APPLICABILITY 
     The optical film of the present invention is useful as a film that imparts an anti-reflective function in optical devices such as cameras, displays, projectors, and telescopes. 
     REFERENCE SIGNS LIST 
     
         
           1  optical body 
           10  master film 
           11  concave-convex resin layer 
         12 base material film 
           15  third concave-convex structure 
           15   a  third convexity 
           15   b  third concavity 
           21  optical film 
           23  adhesive layer 
           25  first concave-convex structure 
           25   a  first convexity 
           25   b  first concavity 
           26  second concave-convex structure 
           26   a  second convexity 
           26   b  second concavity