JP2024042599A - Low-reflection film, low-reflection film with support, book cover and book - Google Patents

Abstract

[Problem] The object is to provide a low-reflection film in which the vicinity of the outer edge is difficult to see, and a low-reflection film with a support, a book cover, and a book using the low-reflection film. [Solution] A low-reflection film 30 having a printed area 35 and a transparent area 34, and a visible light reflectance of 2% or less in the transparent area 34. The low-reflection film 30 includes an outer edge 30a. When the low-reflection film 30 is irradiated with light perpendicular to the surface of the low-reflection film 30, a continuous area in which the intensity of the reflected light is 1.2 times or more the intensity of the reflected light reflected from the central area 30e of the low-reflection film 30, the area extends in the direction in which the outer edge 30a extends, and is 100 μm or less away from the outer edge 30a. When the first outer edge area 30d is defined as an area that extends in the direction in which the outer edge 30a extends and is 100 μm or less away from the outer edge 30a, the width W1 of the first outer edge area 30d is smaller than 100 μm. [Selected Figure] Figure 3A

Description

The present disclosure relates to a low reflection film, a low reflection film with a support part, a cover for a book, and a book.

BACKGROUND ART Laminated films that have transparent portions and can suppress reflection of light on the surface of the film have been known (for example, see Patent Document 1). Patent Document 1 discloses a transparent laminated film including a front antireflection layer constituting the front surface and a back antireflection layer constituting the back surface. According to such a transparent laminated film, the front antireflection layer and the back antireflection layer suppress reflection of light on the front and back surfaces.

Japanese Patent Application Publication No. 2022-47477

By adding a printing area to such low-reflection film that suppresses light reflection on the surface of the film, and by fixing display objects on the low-reflection film, we have realized a variety of expressions that were not possible before. It is possible. For example, by adding a printed area to a part of a transparent low-reflection film and then supporting the low-reflection film so that the surface of the low-reflection film is perpendicular to the horizontal plane, the person who visually recognizes the low-reflection film can This gives the impression that the printed area is floating in the air. Here, the low reflection film was sometimes easily visible near the outer edge. In particular, when an outer edge is formed on the low-reflection film by cutting the low-reflection film, the function of suppressing light reflection by the low-reflection film may be impaired near the outer edge of the low-reflection film. For example, the surface of the low-reflection film may not be smooth near the outer edge of the low-reflection film. In this case, the function of suppressing light reflection by the low-reflection film may be impaired, and the vicinity of the outer edge of the low-reflection film may become easily visible. If the vicinity of the outer edge of the low-reflection film is easily visible, there is a risk that the realization of various expressions using the low-reflection film will be hindered. For example, even if a printed area is added to a part of a transparent low-reflection film, the vicinity of the outer edge of the low-reflection film will be visible, and there is a risk that the printed area will no longer give the impression that it is floating in the air. Ta.

The present disclosure has been made with these points in mind, and provides a low-reflection film in which the vicinity of the outer edge is difficult to see, a low-reflection film with a support portion, a book cover, and a book using the low-reflection film. The purpose is to provide.

A first aspect of the present disclosure is a low-reflection film that includes a printed area and a transparent area, and has a visible light reflectance of 2% or less in the transparent area,
The low reflection film includes an outer edge,
When the low reflection film is irradiated with light perpendicular to the surface of the low reflection film, the intensity of the specularly reflected light is 1.2 compared to the intensity of the specularly reflected light from the central area of the low reflection film. When defining a continuous area that is twice or more, extending in the direction in which the outer edge extends, and having a distance of 100 μm or less from the outer edge as a first outer edge area, the width W1 of the first outer edge area is It is a low reflection film smaller than 100 μm.

A second aspect of the present disclosure provides, in the low reflection film according to the first aspect described above, formed along the outer edge when the low reflection film is irradiated with light perpendicular to the surface of the low reflection film. When defining a continuous region in which the intensity of specularly reflected light is 0.8 times or less as compared to the intensity of specularly reflected light from the central region of the low reflection film as a second outer edge region, the second outer edge The sum of the width W2 of the region and the width W1 of the first outer edge region is less than 100 μm,
The intensity of the reflected light formed between the first outer edge area and the second outer edge area and specularly reflected is 0.8 times or more than the intensity of the reflected light specularly reflected from the central area of the low reflection film. The width of the first connection region, which is approximately 1.2 times or less, may be 5 μm or less.

A third aspect of the present disclosure is that in the low reflection film according to the first aspect or the second aspect described above, when the low reflection film is irradiated with light perpendicular to the surface of the low reflection film, the The intensity of the specularly reflected light formed on the side opposite to the outer edge side of the first outer edge region and extending in the direction in which the outer edge extends is greater than the intensity of the specularly reflected light from the central region of the low reflection film. When defining a continuous region where the width is 0.8 times or less as a third outer edge region, the sum of the width W3 of the third outer edge region and the width W1 of the first outer edge region is smaller than 100 μm;
The intensity of the reflected light formed between the first outer edge area and the third outer edge area and specularly reflected is 0.8 times or more than the intensity of the reflected light specularly reflected from the central area of the low reflection film. The width of the second connection portion, which is 1.2 times or less, may be 5 μm or less.

In a fourth aspect of the present disclosure, in a low reflection film according to each of the first to third aspects described above, the maximum intensity of reflected light in an environment where light is irradiated from multiple directions within a 5 mm band-like region along the outer edge may be 2.0 times or less than the average intensity of reflected light in an environment where light is irradiated from multiple directions within the band-like region.

In a fifth aspect of the present disclosure, the film thickness may be 500 μm or less in the low reflection film according to each of the first aspect to the fourth aspect described above.

In a sixth aspect of the present disclosure, in the low reflection films according to each of the first aspect to the fifth aspect described above, two of the low reflection films are attached to one surface of the two low reflection films. and the other surface are parallel to each other, and when the two low-reflection films are arranged so that the distance between one and the other is 30 cm or less, visible light passes through the two low-reflection films. The light transmittance may be 90% or more.

A seventh aspect of the present disclosure provides a low reflection film according to each of the first aspect to the sixth aspect described above,
A low reflection film with a support part, comprising a support part that supports the low reflection film.

An eighth aspect of the present disclosure is a cover for a book, which includes a low-reflection film according to each of the first aspect to the sixth aspect described above.

A ninth aspect of the present disclosure is a book comprising a low-reflection film according to each of the first to sixth aspects described above.

A tenth aspect of the present disclosure is a low reflection film comprising a transparent region and having a visible light reflectance of 2% or less in the transparent region,
The low reflection film includes an outer edge,
When the low reflection film is irradiated with light perpendicular to the surface of the low reflection film, the intensity of the specularly reflected light is 1.2 compared to the intensity of the specularly reflected light from the central area of the low reflection film. When defining a continuous area that is twice or more, extending in the direction in which the outer edge extends, and having a distance of 100 μm or less from the outer edge as a first outer edge area, the width W1 of the first outer edge area is It is a low reflection film smaller than 100 μm.

An eleventh aspect of the present disclosure is a low reflection film according to the tenth aspect described above,
and a display object fixed on the low reflection film.

In a twelfth aspect of the present disclosure, in the low-reflection film with display according to the eleventh aspect described above, when two low-reflection films with display are arranged such that the surface of one of the two low-reflection films with display is parallel to the surface of the other low-reflection film, and the distance between one of the two low-reflection films with display is 30 cm or less, the visible light transmittance of visible light passing through the portions of the two low-reflection films with display that do not have the display may be 90% or more.

According to the present disclosure, it is possible to provide a low-reflection film in which the vicinity of the outer edge is difficult to see, a low-reflection film with a support portion, a book cover, and a book using the low-reflection film.

FIG. 1 is a plan view showing the low reflection film 30. FIG. 2A is a cross-sectional view showing an example of a layer structure of a low reflection film according to an embodiment. FIG. 2B is a cross-sectional view showing an example of a layer structure of a low reflection film according to an embodiment. FIG. 2C is a cross-sectional view showing an example of a layer structure of a low reflection film according to an embodiment. FIG. 2D is a cross-sectional view showing an example of a layer structure of a low reflection film according to an embodiment. FIG. 2E is a cross-sectional view showing an example of a layer structure of a low reflection film according to an embodiment. FIG. 2F is a cross-sectional view showing an example of a layer structure of a low reflection film according to an embodiment. FIG. 2G is a cross-sectional view showing an example of a layer structure of a low reflection film according to an embodiment. FIG. 2H is a cross-sectional view showing an example of a layer structure of a low reflection film according to an embodiment. FIG. 2I is a cross-sectional view showing an example of a layer structure of a low reflection film according to an embodiment. FIG. 2J is a cross-sectional view showing an example of a layer structure of a low reflection film according to an embodiment. FIG. 2K is a cross-sectional view showing an example of a layer structure of a low reflection film according to an embodiment. FIG. 2L is a diagram for explaining a bending stress measurement test method. FIG. 3A is an enlarged plan view showing a portion surrounded by a dashed line labeled IIIA in FIG. 1. FIG. FIG. 3B is a perspective view showing an example of a low reflection film with a support portion according to an embodiment. FIG. 3C is a perspective view showing another example of a low reflection film with a support portion according to an embodiment. FIG. 4A is a plan view showing an enlarged part of the vicinity of the outer edge of the low reflection film according to the first modification. FIG. 4B is a diagram showing an example of a cross section of the low reflection film near the outer edge. FIG. 4C is a perspective view showing a low reflection film with a display object according to a second modification. FIG. 5 is a perspective view showing a book cover according to a third modification. FIG. 6 is a perspective view showing a book according to a fourth modification. FIG. 7A is a diagram showing a digital photograph of a region near the outer edge of the low reflection film in Example 1. FIG. 7B is a diagram showing a digital photograph of a region near the outer edge of the low-reflection film in Example 2. FIG. 7C is a diagram showing a digital photograph of a region near the outer edge of the low-reflection film in Example 3. FIG. 7D is a diagram showing a digital photograph of a region near the outer edge of the low-reflection film in Comparative Example 1. FIG. 7E is a diagram showing a digital photograph of a region near the outer edge of the low-reflection film in Comparative Example 2. FIG. 7F is a diagram showing a digital photograph of a region near the outer edge of the low-reflection film in Comparative Example 3.

The present embodiment will be described below with reference to the drawings. 1 to 3C are diagrams showing this embodiment. Each figure shown below is a schematic view. Therefore, the size and shape of each part are appropriately exaggerated to facilitate understanding. In addition, the present invention can be modified and implemented as appropriate without departing from the technical concept. In each figure shown below, the same parts are given the same reference numerals, and some detailed explanations may be omitted. Further, the numerical values such as the dimensions of each member and the material names described in this specification are examples as an embodiment, and can be appropriately selected and used without being limited thereto. In this specification, terms that specify shapes and geometric conditions, such as terms such as parallel, orthogonal, and perpendicular, are interpreted not only in their strict meanings but also to include substantially the same state.

(Low reflection film)
First, the low reflection film 30 will be explained. FIG. 1 is a plan view showing a low reflection film 30 according to this embodiment. The shape of the low-reflection film 30 is not particularly limited, and can be determined as appropriate depending on the application. In the example shown in FIG. 1, the low reflection film 30 has a rectangular shape. The low reflection film 30 has a first surface 301 and a second surface 302 located on the opposite side of the first surface 301. The first surface 301 and the second surface 302 are parallel to each other.

The low reflection film 30 shown in FIG. 1 includes a printed area 35 and a transparent area 34. The visible light reflectance in the transparent region 34 is 2% or less. Here, regarding the low reflection film 30, the visible light reflectance in the transparent region 34 means the regular reflectance of visible light, and in particular, the first surface It means the specular reflectance of visible light incident from the 301 side. That is, the visible light reflectance of 2% or less means that the regular reflectance of visible light that enters the transparent region 34 of the low reflection film 30 from the first surface 301 side is 2% or less. As a result, when an observer of the low-reflection film 30 views the transparent region 34 of the low-reflection film 30 from the first surface 301 side, an object, such as the observer's own figure, appears in the transparent region 34 of the low-reflection film 30. Reflection is suppressed. This makes it difficult for an observer to recognize the existence of the transparent region 34 of the low reflection film 30. The visible light reflectance is more preferably 1% or less. The regular reflectance of visible light that enters the transparent region 34 of the low-reflection film 30 from the first surface 301 side is 2% or less, and the visible light that enters the transparent region 34 of the low-reflection film 30 from the second surface 302 side. may have a regular reflectance of 2% or less. Thereby, even if the observer of the low reflection film 30 views the transparent area 34 of the low reflection film 30 from either the first surface 301 side or the second surface 302 side, the transparent area 34 of the low reflection film 30 This prevents objects, such as the viewer's own image, from being reflected in the image.

Furthermore, the low reflection film 30 includes an outer edge 30a. The rectangular low reflection film 30 shown in FIG. 1 has a pair of first sides 30c and a pair of second sides 30b as an outer edge 30a. One of the pair of second sides 30b is called an upper edge 30b1, and the other is called a lower edge 30b2. Further, the pair of first sides 30c are also referred to as a pair of side edges 30c.

The letter "A" is printed in the print area 35 of the low reflection film 30 shown in FIG. Although not shown, other characters may be printed in the print area 35, or information other than characters, a design, etc. may be printed thereon. In the example shown in FIG. 1, the print area 35 is surrounded by the transparent area 34. Further, the entire outer edge 30a of the low reflection film 30 is formed by the transparent region 34. Although not shown, a part of the outer edge 30a of the low reflection film 30 may be formed by the printing area 35.

Next, the low reflection film 30 according to this embodiment will be explained. The low reflection film 30 may be used for a low reflection film 100 with a support portion, a book cover 81, a book 82, etc., which will be described later. In the example shown in FIGS. 2A to 2I, a low reflection film 30 including a printed area 35 and a transparent area 34 includes a core layer 32 and a printed layer 33. Further, the low reflection film 30 is provided on one side of the core layer 32 and constitutes the first surface 301, and the low reflection film 30 is provided on the other side of the core layer 32 and constitutes the second surface 302. A second surface antireflection layer 50 is provided. Furthermore, the low reflection film 30 includes a first transparent adhesive layer 31a that adheres the first surface antireflection layer 40 and the core layer 32, and a second transparent adhesive layer that adheres the core layer 32 and the second surface antireflection layer 50. It may further include a layer 31b. In addition, in the description of the positional relationship of each layer constituting the first surface antireflection layer 40, the first surface 301 side is referred to as the "outside". Furthermore, in the description of the positional relationship between the layers constituting the second surface antireflection layer 50, the second surface 302 side will be referred to as the "outside".

The position of the printed layer 33 on the low reflection film 30 is not particularly limited as long as the printed area 35 is formed by the printed layer 33. In FIGS. 2A to 2H, the printed layer 33 covers a part of the surface of the core layer 32 on the first surface 301 side or a part of the surface on the second surface 302 side. In FIG. 2I, the low reflection film 30 includes a first printed layer 331 forming a part of the first surface 301 of the low reflection film 30 and a part of the second surface 302 of the low reflection film 30 as the printed layer 33. a second printed layer 332 to be formed. Particularly in FIG. 2I, the first printed layer 331 covers a part of the first surface antireflection layer 40, which will be described later, of the low reflection film 30. Further, the second printed layer 332 covers a part of the second surface antireflection layer 50 of the low reflection film 30, which will be described later. Although not illustrated, the low reflection film 30 may include either one of the first printed layer 331 and the second printed layer 332 as the printed layer 33.

In the examples shown in Figures 2A, 2C, and 2E, the low-reflection film 30 comprises, in this order from the first surface 301 to the second surface 302, a first-surface anti-reflection layer 40, a first transparent adhesive layer 31a, a printing layer 33, a core layer 32, a second transparent adhesive layer 31b, and a second-surface anti-reflection layer 50. In this case, in the low-reflection film 30, the first-surface anti-reflection layer 40 is exposed outward from the first surface 301 side. Also, in the low-reflection film 30, the second-surface anti-reflection layer 50 is exposed outward from the second surface 302 side.

In the examples shown in FIGS. 2B, 2D, and 2F, the low reflection film 30 has a first surface antireflection layer 40 and a first transparent adhesive layer 31a from the first surface 301 toward the second surface 302. , a core layer 32, a printed layer 33, a second transparent adhesive layer 31b, and a second surface antireflection layer 50 in this order. Also in this case, in the low reflection film 30, the first surface antireflection layer 40 is exposed outward from the first surface 301 side. Further, in the low reflection film 30, the second surface antireflection layer 50 is exposed outward from the second surface 302 side.

In the example shown in FIG. 2G, the low reflection film 30 includes, from the first surface 301 toward the second surface 302, a first surface antireflection layer 40, a printed layer 33, a first transparent adhesive layer 31a, The core layer 32, the second transparent adhesive layer 31b, and the second surface antireflection layer 50 are provided in this order. Also in this case, in the low reflection film 30, the first surface antireflection layer 40 is exposed outward from the first surface 301 side. Further, in the low reflection film 30, the second surface antireflection layer 50 is exposed outward from the second surface 302 side.

In the example shown in FIG. 2H, the low reflection film 30 includes, from the first surface 301 toward the second surface 302, a first surface antireflection layer 40, a first transparent adhesive layer 31a, a core layer 32, The second transparent adhesive layer 31b, the printing layer 33, and the second surface antireflection layer 50 are provided in this order. Also in this case, in the low reflection film 30, the first surface antireflection layer 40 is exposed outward from the first surface 301 side. Further, in the low reflection film 30, the second surface antireflection layer 50 is exposed outward from the second surface 302 side.

In the example shown in FIG. 2I, the low reflection film 30 includes, from the first surface 301 toward the second surface 302, a first printed layer 331, a first surface antireflection layer 40, and a first transparent adhesive layer 31a. , a core layer 32, a second transparent adhesive layer 31b, a second surface antireflection layer 50, and a second printed layer 332 in this order. In this case, in the low reflection film 30, the first printed layer 331 is exposed outward from the first surface 301 side. Further, a portion of the first surface antireflection layer 40 that is not covered with the first printed layer 331 is exposed outward from the first surface 301 side. Further, the second printed layer 332 is exposed outward from the second surface 302 side. Further, a portion of the second surface antireflection layer 50 that is not covered with the second printed layer 332 is exposed outward from the second surface 302 side.

Further, as shown in FIGS. 2A to 2I, the first surface antireflection layer 40 includes a first surface antireflection functional layer 41 disposed in order from the first surface 301 to the second surface 302, and It has a transparent base material layer 42. Further, the first surface antireflection functional layer 41 includes a first surface refractive layer 43 and a first surface hard coat layer 44, which are arranged in order from the first surface 301 to the second surface 302. Here, as shown in FIGS. 2C to 2F and 2I, the first surface refractive layer 43 includes a first surface low refractive index layer 45 arranged in order from the first surface 301 toward the second surface 302; The first surface high refractive index layer 46 may also be included. Further, as shown in FIGS. 2E and 2F, the first surface high refractive index layer 46 includes a first first surface high refractive index layer 47 arranged in order from the first surface 301 toward the second surface 302. , and a second first surface high refractive index layer 48. In the examples shown in FIGS. 2G and 2H, the first surface antireflection layer 40 includes a first surface antireflection functional layer 41 and a first surface transparent base material layer 42, and has a first surface antireflection function. Layer 41 includes a first surface refractive layer 43 and a first surface hard coat layer 44 . In this case, in the first surface antireflection layer 40 of the low reflection film 30 shown in FIGS. 2G and 2H, the first surface refractive layer 43 may be a first surface low refractive index layer 45 or a first surface high refractive index layer 46. May contain.

Further, as shown in FIGS. 2A to 2I, the second surface antireflection layer 50 includes a second surface antireflection functional layer 51 arranged in order from the second surface 302 toward the first surface 301, and a second surface antireflection functional layer 51 disposed in order from the second surface 302 toward the first surface 301. It has a transparent base material layer 52. Further, the second surface antireflection functional layer 51 includes a second surface refractive layer 53 and a second surface hard coat layer 54, which are arranged in order from the second surface 302 toward the first surface 301. Here, as shown in FIGS. 2C to 2F and 2I, the second surface refractive layer 53 includes a second surface low refractive index layer 55 arranged in order from the second surface 302 toward the first surface 301; The second surface high refractive index layer 56 may also be included. Further, as shown in FIGS. 2E and 2F, the second surface high refractive index layer 56 includes a first second surface high refractive index layer 57 arranged in order from the second surface 302 toward the first surface 301. , a second second surface high refractive index layer 58. In the examples shown in FIGS. 2G and 2H, the second surface antireflection layer 50 includes a second surface antireflection functional layer 51 and a second surface transparent base layer 52, and the second surface antireflection layer 50 has a second surface antireflection function. Layer 51 includes a second surface refractive layer 53 and a second surface hard coat layer 54 . In this case, in the second surface antireflection layer 50 of the low reflection film 30 shown in FIGS. 2G and 2H, the second surface refractive layer 53 is a second surface low refractive index layer 55, a second surface high refractive index layer 56, etc. May contain.

Further, as shown in FIGS. 2J and 2K, the low reflection film 30 does not need to include the core layer 32. Specifically, as shown in FIG. 2J, the low reflection film 30 includes, from the first surface 301 toward the second surface 302, a first surface antireflection layer 40, a printed layer 33, and a transparent adhesive layer 31. , and the second surface antireflection layer 50 may be provided in this order. Also in this case, in the low reflection film 30, the first surface antireflection layer 40 is exposed outward from the first surface 301 side. Further, in the low reflection film 30, the second surface antireflection layer 50 is exposed outward from the second surface 302 side.

Further, as shown in FIG. 2K, the low reflection film 30 includes, from the first surface 301 toward the second surface 302, a first surface antireflection layer 40, a transparent adhesive layer 31, a printed layer 33, and a second surface. The surface antireflection layer 50 may be provided in this order. Also in this case, in the low reflection film 30, the first surface antireflection layer 40 is exposed outward from the first surface 301 side. Further, in the low reflection film 30, the second surface antireflection layer 50 is exposed outward from the second surface 302 side.

In the examples shown in FIGS. 2J and 2K, the first surface antireflection layer 40 has a first surface antireflection function layer 41 and a first surface transparent base material layer 42, and has a first surface antireflection function. Layer 41 includes a first surface refractive layer 43 and a first surface hard coat layer 44 . Further, the second surface antireflection layer 50 has a second surface antireflection functional layer 51 and a second surface transparent base material layer 52, and the second surface antireflection functional layer 51 has a second surface refractive layer 53. A second surface hard coat layer 54 is included. In this case, in the first surface antireflection layer 40 of the low reflection film 30 shown in FIGS. 2J and 2K, the first surface refractive layer 43 may include a first surface low refractive index layer 45, etc., and FIG. In the second surface antireflection layer 50 of the low reflection film 30 shown in FIG. 2K, the second surface refractive layer 53 may include a second surface low refractive index layer 55 and the like.

As described above, the first-side anti-reflection layer 40 may have a basic configuration having a first-side high refractive index layer 46 and a first-side low refractive index layer 45 on the outside of the first-side transparent substrate layer 42. Also, as described above, the second-side anti-reflection layer 50 may have a basic configuration having a second-side high refractive index layer 56 and a second-side low refractive index layer 55 on the outside of the second-side transparent substrate layer 52. The first-side high refractive index layer 46 (second-side high refractive index layer 56) and the first-side low refractive index layer 45 (second-side low refractive index layer 55) play a role in providing an anti-reflection function by optical interference function.

The first-side anti-reflection layer 40 (second-side anti-reflection layer 50) may be provided with an anti-reflection function by optical interference of three or more layers by further providing a medium refractive index layer, but it is not preferable from the viewpoint of cost-effectiveness to have too many layers. Therefore, the first-side anti-reflection layer 40 (second-side anti-reflection layer 50) according to this embodiment is preferably provided with an anti-reflection function by optical interference in two layers, the first-side high refractive index layer 46 (second-side high refractive index layer 56) and the first-side low refractive index layer 45 (second-side low refractive index layer 55). The first-side anti-reflection layer 40 (second-side anti-reflection layer 50) may be provided with an anti-reflection function by optical interference in three layers, the medium refractive index layer, the high refractive index layer, and the low refractive index layer, by making the first-side hard coat layer 44 (second-side hard coat layer 54) a medium refractive index layer.

Although not shown, the low reflection film 30 may include the first surface antireflection layer 40 and may not include the second surface antireflection layer 50. Even in this case, the reflectance of light incident from the first surface 301 side can be kept low.

The area where the print layer 33 is located when the low reflection film 30 is observed from the thickness direction (direction perpendicular to the first surface 301) is the print area 35 of the low reflection film 30. Further, when the low reflection film 30 is observed from the thickness direction (direction perpendicular to the first surface 301), the area where the printed layer 33 is not located becomes the transparent area 34 of the low reflection film 30.

Each layer of the low reflection film 30 will be explained below.

<First-Side Antireflection Layer and Second-Side Antireflection Layer>
The first-side antireflection layer 40 is a layer for suppressing reflection of light incident from the first surface 301 side of the low-reflection film 30. By providing the low-reflection film 30 with the first-side antireflection layer 40, it is possible to suppress reflection of light on the first surface 301 of the low-reflection film 30. In addition, the first-side antireflection layer 40 plays a role in suppressing not only reflection of light incident from the first surface 301 side, but also reflection of light incident from the second surface 302 side. This makes it difficult for an observer of the low-reflection film 30 to recognize the presence of the transparent region 34 of the low-reflection film 30.

On the other hand, the second surface antireflection layer 50 is a layer mainly for suppressing reflection of light incident from the second surface 302 side of the low reflection film 30. Since the low reflection film 30 includes the second surface antireflection layer 50, reflection of light on the second surface 302 of the low reflection film 30 can be suppressed. Further, the second surface antireflection layer 50 plays a role of suppressing not only the reflection of light incident from the second surface 302 side but also the reflection of light incident from the first surface 301 side. This makes it difficult for an observer of the low reflection film 30 to recognize the existence of the transparent region 34 of the low reflection film 30.

As described above, the first surface antireflection layer 40 includes the first surface antireflection functional layer 41 and the first surface transparent base layer 42 . Moreover, the second surface antireflection layer 50 has the second surface antireflection functional layer 51 and the second surface transparent base material layer 52, as described above. Here, first, the first side transparent base material layer 42 and the second side transparent base material layer 52 will be explained. Note that the first surface antireflection layer 40 and the second surface antireflection layer 50 may have a structure other than the above-described layer structure, and may each be formed of a resin film. For example, the first antireflection layer 40 and the second antireflection layer 50 may each use a low reflection film (FG-10MR1, manufactured by Sharp Corporation). Further, the first surface antireflection layer 40 and the second surface antireflection layer 50 may have a structure in which irregularities are formed on the surface of a resin provided on a transparent base material, which is generally known as a moth eye. . In this case, there may be a primer layer between the transparent base material and the resin surface to improve adhesion. Note that the resin on which the unevenness is formed may be provided only on one side of the transparent base material, or may be provided on both sides.

[First side transparent base layer and second side transparent base layer]
The first surface transparent base material layer 42 and the second surface transparent base material layer 52 support the first surface antireflection functional layer 41 and the second surface antireflection functional layer 51, and also support the first surface antireflection layer 41 and the second surface antireflection functional layer 51, for example. and a layer for increasing the overall strength of the second surface antireflection layer 50. The materials for the first-side transparent base layer 42 and the second-side transparent base layer 52 are not particularly limited as long as they are transparent and are used as base materials for general films, but from the viewpoint of material cost, productivity, etc. From these, plastic films, plastic sheets, etc. can be selected as appropriate depending on the purpose.

Examples of the plastic film or sheet include those made of various synthetic resins. Examples of the synthetic resin include cellulose resins such as triacetyl cellulose resin (TAC), diacetyl cellulose, acetate butyrate cellulose, and cellophane; polyester resins such as polyethylene terephthalate resin (PET), polybutylene terephthalate resin, polyethylene naphthalate-isophthalate copolymer resin, and polyester-based thermoplastic elastomer; polyolefin resins such as low-density polyethylene resin (including linear low-density polyethylene resin), medium-density polyethylene resin, high-density polyethylene resin, ethylene-α-olefin copolymer, polypropylene resin, polymethylpentene resin, polybutene resin, ethylene-propylene copolymer, propylene-butene copolymer, olefin-based thermoplastic elastomer, and mixtures thereof; acrylic resins such as poly(methyl (meth)acrylate resin, poly(ethyl (meth)acrylate resin, and poly(butyl (meth)acrylate resin); polyamide resins such as nylon 6 or nylon 66; polystyrene resin; polycarbonate resin; polyarylate resin; and polyimide resin. Furthermore, the material of the first surface transparent substrate layer 42 and the second surface transparent substrate layer 52 may be a cycloolefin polymer (COP) resin or a cycloolefin copolymer (COC) resin.

As the first side transparent base material layer 42 and the second side transparent base material layer 52, the above-mentioned plastic films and plastic sheets can be used singly or as a mixture of two or more selected, but flexible From the viewpoints of toughness, transparency, etc., cellulose resin and polyester resin are more preferable as materials for the first side transparent base layer 42 and the second side transparent base layer 52. Further, from the viewpoints of flexibility, toughness, transparency, etc., it is preferable that the first side transparent base layer 42 and the second side transparent base layer 52 contain triacetyl cellulose and polyethylene terephthalate.

The thicknesses of the first-side transparent base layer 42 and the second-side transparent base layer 52 are not particularly limited and are appropriately selected depending on the application. The thickness of the first side transparent base layer 42 and the second side transparent base layer 52 may be approximately 5 μm or more and 130 μm or less, respectively, and in consideration of durability, handleability, etc., the thickness is 10 μm or more and 100 μm or less. is preferred. The thickness of each layer is determined by measuring the thickness at 20 locations from a cross-sectional image taken using, for example, a scanning electron microscope (SEM), a transmission electron microscope (TEM), or a scanning transmission electron microscope (STEM). However, it can be calculated from the average value of the values at 20 locations. When the film thickness to be measured is on the order of μm, it is preferable to use SEM, and when it is on the order of nm, it is preferable to use TEM or STEM. In the case of SEM, the accelerating voltage is preferably 1 kV or more and 10 kV or less, and the magnification is 1000 times or more and 7000 times or less, and in the case of TEM or STEM, the accelerating voltage is 10 kV or more and 30 kV or less, and the magnification is 50,000 times or more and 300,000 times or less. It is preferable that The thickness of each layer described below can be measured in the same manner as the thickness of the first transparent base layer 42 and the second transparent base layer 52.

[First surface anti-reflection functional layer and second surface anti-reflection functional layer]
Next, the first surface antireflection functional layer 41 and the second surface antireflection functional layer 51 will be explained. The first surface antireflection functional layer 41 and the second surface antireflection functional layer 51 serve to impart a function of suppressing light reflection to the first surface antireflection layer 40 and the second surface antireflection layer 50, respectively. fulfill.

Further, the first surface antireflection functional layer 41 may be a coating layer coated on the outside of the first surface transparent base material layer 42, and the second surface antireflection functional layer 51 may be a coating layer coated on the outside of the first surface transparent base material layer 42. It may also be a coating layer coated on the outside of layer 52. In this way, since the first surface antireflection functional layer 41 and the second surface antireflection functional layer 51 are coating layers, the thickness of the first surface antireflection functional layer 41 and the second surface antireflection functional layer 51 can be easily controlled. Therefore, desired functions such as the light reflectance and total light transmittance of the low reflection film 30 can be easily controlled.

It is preferable that the first surface antireflection functional layer 41 and the second surface antireflection functional layer 51 are each made of a cured product containing an acrylic monomer. Thereby, the first surface antireflection functional layer 41 and the second surface antireflection functional layer 51 can be formed with high uniformity even in a short processing time.

Here, the first surface antireflection functional layer 41 includes the first surface refractive layer 43 and the first surface hard coat layer 44, as described above. Further, the second surface antireflection functional layer 51 includes the second surface refractive layer 53 and the second surface hard coat layer 54, as described above. The first surface hard coat layer 44 may be a coating layer coated on the outside of the first surface transparent base layer 42, and the first surface refractive layer 43 may be a coating layer coated on the outside of the first surface hard coat layer 44. It may be a coated layer. Further, the second surface hard coat layer 54 may be a coating layer coated on the outside of the second surface transparent base layer 52, and the second surface refractive layer 53 may be a coating layer coated on the outside of the second surface hard coat layer 54. It may be a coating layer coated on. In this way, since the first surface refractive layer 43, the first surface hard coat layer 44, the second surface refractive layer 53, and the second surface hard coat layer 54 are coating layers, the thickness of each layer can be easily controlled. Therefore, desired functions such as the light reflectance, total light transmittance, and color tone of the low-reflection film 30 can be easily controlled.

Next, the first surface hard coat layer 44 and the second surface hard coat layer 54 will be explained.

{First side hard coat layer and second side hard coat layer}
The first surface hard coat layer 44 and the second surface hard coat layer 54 serve to improve the scratch resistance of the first surface antireflection layer 40 and the second surface antireflection layer 50. Here, the hard coat refers to a coat that exhibits a hardness of "H" or higher in the scratch hardness (pencil method) measurement test specified in JIS K5600-5-4:1999. The first side hard coat layer 44 and the second side hard coat layer 54 can be formed, for example, from a hard coat layer coating liquid containing a curable resin composition. Examples of the curable resin composition include thermosetting resin compositions and ionizing radiation-curable resin compositions, and ionizing radiation-curable resin compositions are preferred from the viewpoint of scratch resistance.

The thermosetting resin composition is a composition containing at least a thermosetting resin, and is a resin composition that is cured by heating. Examples of the thermosetting resin include acrylic resin, urethane resin, phenol resin, urea melamine resin, epoxy resin, unsaturated polyester resin, and silicone resin. In the thermosetting resin composition, a curing agent is added to these curable resins as necessary.

The ionizing radiation-curable resin composition is a composition containing a compound having an ionizing radiation-curable functional group (hereinafter also referred to as "ionizing radiation-curable compound"). Examples of the ionizing radiation-curable functional group include ethylenically unsaturated bond groups such as (meth)acryloyl group, vinyl group, and allyl group, as well as epoxy group and oxetanyl group. As the ionizing radiation-curable compound, a compound having an ethylenically unsaturated bond group is preferable, a compound having two or more ethylenically unsaturated bond groups is more preferable, and among them, a compound having two or more ethylenically unsaturated bond groups, More preferred are polyfunctional (meth)acrylate compounds. As the polyfunctional (meth)acrylate compound, both monomers and oligomers can be used. Note that ionizing radiation refers to electromagnetic waves or charged particle beams that have energy quantum that can polymerize or crosslink molecules, and ultraviolet rays (UV) or electron beams (EB) are usually used, but other Electromagnetic waves such as X-rays and γ-rays, and charged particle beams such as α-rays and ion beams can also be used.

Among polyfunctional (meth)acrylate compounds, examples of bifunctional (meth)acrylate monomers include ethylene glycol di(meth)acrylate, bisphenol A tetraethoxy diacrylate, bisphenol A tetrapropoxy diacrylate, and 1,6-hexane. Examples include diol diacrylate. Examples of trifunctional or higher-functional (meth)acrylate monomers include trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol hexa(meth)acrylate, and dipentaerythritol hexa(meth)acrylate. Examples include pentaerythritol tetra(meth)acrylate, isocyanuric acid-modified tri(meth)acrylate, and the like. Furthermore, the above (meth)acrylate monomers may have a part of their molecular skeleton modified, such as ethylene oxide, propylene oxide, caprolactone, isocyanuric acid, alkyl, cyclic alkyl, aromatic, bisphenol, etc. can also be used.

Examples of the polyfunctional (meth)acrylate oligomer include acrylate polymers such as urethane (meth)acrylate, epoxy (meth)acrylate, polyester (meth)acrylate, and polyether (meth)acrylate. Urethane (meth)acrylates are obtained, for example, by reacting polyhydric alcohols and organic diisocyanates with hydroxy (meth)acrylates. Preferred epoxy (meth)acrylates include (meth)acrylates obtained by reacting trifunctional or higher functional aromatic epoxy resins, alicyclic epoxy resins, aliphatic epoxy resins, etc. with (meth)acrylic acid, difunctional A (meth)acrylate obtained by reacting the above aromatic epoxy resin, alicyclic epoxy resin, aliphatic epoxy resin, etc. with a polybasic acid and (meth)acrylic acid, and a difunctional or more aromatic epoxy resin, It is a (meth)acrylate obtained by reacting an alicyclic epoxy resin, an aliphatic epoxy resin, etc., a phenol, and (meth)acrylic acid. The above-mentioned ionizing radiation-curable compounds can be used alone or in combination of two or more.

When the ionizing radiation curable compound is an ultraviolet curable compound, the ionizing radiation curable composition preferably contains additives such as a photopolymerization initiator and a photopolymerization accelerator. Examples of the photopolymerization initiator include one or more selected from acetophenone, benzophenone, α-hydroxyalkylphenone, Michler's ketone, benzoin, benzyl methyl ketal, benzoyl benzoate, α-acyloxime ester, thioxanthone, and the like. It is preferable that these photopolymerization initiators have a melting point of 100°C or higher. By setting the melting point of the photopolymerization initiator to 100°C or higher, the remaining photopolymerization initiator is sublimated by the heat of forming the transparent conductive film or during the crystallization process, and the low resistance of the transparent conductive film is prevented from being impaired. can do. The same applies when a photopolymerization initiator is used in a high refractive index layer and a low refractive index layer, which will be described later. In addition, the photopolymerization accelerator can reduce polymerization inhibition caused by air during curing and accelerate the curing speed, and includes, for example, p-dimethylaminobenzoic acid isoamyl ester, p-dimethylaminobenzoic acid ethyl ester, etc. One or more types may be selected.

The thickness of the first surface hard coat layer 44 and the second surface hard coat layer 54 is preferably in the range of 0.1 μm or more and 100 μm or less, and more preferably in the range of 0.8 μm or more and 20 μm or less. If the thickness of the first-side hard coat layer 44 and the second-side hard coat layer 54 are within the above ranges, sufficient hard coat performance can be obtained, and no cracks or the like will occur against external impact. It becomes difficult.

The refractive index of the first surface hard coat layer 44 and the second surface hard coat layer 54 is preferably smaller than the refractive index of the first surface high refractive index layer 46 and the second surface high refractive index layer 56, and is 1.45 or more. It is more preferably 1.70 or less, and even more preferably 1.45 or more and 1.60 or less. If the refractive index of the first surface hard coat layer 44 and the second surface hard coat layer 54 is within such a range, the first surface hard coat layer 44 and the second surface hard coat layer 54 serve as intermediate refractive index layers, respectively. has the role of As a result, the interference effect by the three layers of the first surface hard coat layer 44, the first surface high refractive index layer 46, and the first surface low refractive index layer 45, and the second surface hard coat layer 54, the second surface high refractive index layer An interference effect can be achieved by the three layers of the index layer 56 and the second surface low refractive index layer 55. Therefore, reflection of light can be effectively suppressed. In addition, from the viewpoint of suppressing interference fringes, the refractive index of the first surface hard coat layer 44 and the second surface hard coat layer 54 and the refractive index of the first surface transparent base material layer 42 and the second surface transparent base material layer 52 are It is preferable to reduce the difference with the rate.

As means for imparting the role of a medium refractive index layer to the first surface hard coat layer 44 and the second surface hard coat layer 54, there are two methods: a means of blending a resin with a high refractive index into the hard coat layer coating liquid; Examples include means of blending high particles. If particles with a high refractive index are blended, whitening or coating defects may occur due to aggregation of the particles, so the former method (blending a resin with a high refractive index) is preferable. Examples of the resin having a high refractive index include those obtained by introducing a group containing sulfur, phosphorus, or bromine, an aromatic ring, or the like into the above-mentioned thermosetting resin or ionizing radiation-curable compound. As the particles having a high refractive index, particles similar to those used for the first surface high refractive index layer 46 and the second surface high refractive index layer 56 described later can be used.

The refractive index of each layer such as the first surface hard coat layer 44 and the second surface hard coat layer 54 is determined by, for example, a reflection spectrum measured by a reflection photometer and a reflection spectrum calculated from an optical model of a multilayer thin film using Fresnel coefficients. It can be calculated by fitting with

The first side hard coat layer 44 and the second side hard coat layer 54 are made of the above-mentioned curable resin composition, additives such as an ultraviolet absorber and a leveling agent, and a diluting solvent, which are added as necessary to form a hard coat layer. It can be formed by preparing a coating liquid, applying the coating liquid onto a transparent substrate by a conventionally known coating method, drying, and, if necessary, curing by irradiating with ionizing radiation.

{First surface refractive layer and second surface refractive layer}
Next, the first surface refractive layer 43 and the second surface refractive layer 53 will be explained. The first surface refractive layer 43 and the second surface refractive layer 53 serve to reduce the light reflectance of the first surface antireflection layer 40 and the second surface antireflection layer 50. The first surface refractive layer 43 includes the first surface low refractive index layer 45 and the first surface high refractive index layer 46, as described above. Further, the second surface refractive layer 53 includes the second surface low refractive index layer 55 and the second surface high refractive index layer 56, as described above. Here, first, the first surface low refractive index layer 45 and the second surface low refractive index layer 55 will be explained. Note that, as shown in FIGS. 2A, 2B, etc., when the first surface refractive layer 43 and the second surface refractive layer 53 are each composed of a single layer, the first surface refractive layer 43 is a first surface low refractive layer. The second surface refractive layer 53 may be comprised only of the second surface low refractive index layer 55.

(First surface low refractive index layer and second surface low refractive index layer)
The first surface low refractive index layer 45 and the second surface low refractive index layer 55 are layers provided outside the first surface high refractive index layer 46 and the second surface high refractive index layer 56, respectively. The role of reducing the light reflectance of the first surface antireflection layer 40 and the second surface antireflection layer 50 by interference effect using the difference in refractive index between the refractive index layer 46 and the second surface high refractive index layer 56 fulfill. The first surface low refractive index layer 45 and the second surface low refractive index layer 55 have a refractive index of 1.26 in order to make the first surface antireflection layer 40 and the second surface antireflection layer 50 extremely low reflectance. It is preferably at least 1.40, more preferably at least 1.28 and at most 1.38, even more preferably at least 1.30 and at most 1.32. The lower the refractive index of the first surface low refractive index layer 45 and the second surface low refractive index layer 55, the lower the refractive index of the first surface high refractive index layer 46 and the second surface high refractive index layer 56. The refractive index of the first surface antireflection layer 40 and the second surface antireflection layer 50 can be lowered without increasing the refractive index. On the other hand, if the refractive index of the first surface low refractive index layer 45 and the second surface low refractive index layer 55 is made too low, the strength of the first surface low refractive index layer 45 and the second surface low refractive index layer 55 decreases. There is a tendency to Therefore, by setting the refractive indices of the first surface low refractive index layer 45 and the second surface low refractive index layer 55 to the above ranges, the first surface low refractive index layer 45 and the second surface low refractive index layer 55 are This is preferable in that it is possible to suppress the amount of high refractive index particles (described later) in the first surface high refractive index layer 46 and the second surface high refractive index layer 56 while maintaining strength, which leads to suppression of color tint and whitening. be. The thickness of the first surface low refractive index layer 45 and the second surface low refractive index layer 55 is preferably 80 nm or more and 120 nm, more preferably 85 nm or more and 110 nm, and preferably 90 nm or more and 105 nm. More preferred. In addition, the first surface low refractive index layer 45 and the second surface low refractive index layer 55 may each be formed from a plurality of layers satisfying the above refractive index range, but from the viewpoint of cost effectiveness, two or less layers may be formed. is preferable, and a single layer is more preferable.

The methods for forming the first surface low refractive index layer 45 and the second surface low refractive index layer 55 can be broadly divided into wet methods and dry methods. Wet methods include a method of forming the first surface low refractive index layer 45 and the second surface low refractive index layer 55 by a sol-gel method using metal alkoxides or the like, a method of forming the first surface low refractive index layer by applying a resin having a low refractive index such as fluororesin, and a method of forming the first surface low refractive index layer by applying a coating liquid for forming the first surface low refractive index layer in which low refractive index particles are contained in a resin composition. Dry methods include a method of selecting particles having a desired refractive index from the low refractive index particles described below and forming the first surface low refractive index layer by a physical vapor deposition method or a chemical vapor deposition method. The wet method is superior in terms of production efficiency, and in the present embodiment, it is preferable to form the first surface low refractive index layer by using a coating liquid for forming the first surface low refractive index layer in which low refractive index particles are contained in a resin composition among the wet methods.

Low refractive index particles are preferably used for the purpose of lowering the refractive index, that is, improving antireflection properties, and can be used without restriction, whether they are inorganic particles such as silica or magnesium fluoride, or organic particles. However, from the viewpoint of further improving antireflection properties and ensuring good surface hardness, particles having a structure in which they themselves have voids are preferably used.

Particles that have a structure in which they themselves have voids have minute voids inside, and are filled with a gas such as air with a refractive index of 1.0, so they have a low refractive index. It becomes. Examples of particles having such voids include inorganic or organic porous particles and hollow particles, such as porous silica, hollow silica particles, or porous polymer particles using acrylic resin. and hollow polymer particles. Preferred examples of the inorganic particles include silica particles having voids prepared using the technique disclosed in JP-A No. 2001-233611. A preferable example of the organic particles is hollow polymer particles prepared using the technique disclosed in JP-A-2002-80503. Silica having voids or porous silica as described above has a refractive index in the range of 1.18 to 1.44, and has a higher refraction than general silica particles, which have a refractive index of about 1.45. Since the index is low, it is preferable from the viewpoint of lowering the refractive index of the first surface low refractive index layer 45 and the second surface low refractive index layer 55.

The hollow silica particles are particles that have the function of lowering the refractive index of the first surface low refractive index layer 45 and the second surface low refractive index layer 55 while maintaining their coating strength. The hollow silica particles used in this embodiment are silica particles having a structure that has a cavity inside. Hollow silica particles are silica particles whose refractive index decreases in inverse proportion to the occupancy of internal cavities, compared to the silica particle's original refractive index (refractive index n = about 1.45). Therefore, the refractive index of the hollow silica particles as a whole becomes 1.18 or more and 1.44 or less.

Hollow silica particles are not particularly limited, and are, for example, particles that have an outer shell and are porous or hollow inside; , JP-A-7-133105, and JP-A-2001-233611.

The average particle diameter of the primary particles of the low refractive index particles is preferably 5 nm or more and 200 nm or less, more preferably 5 nm or more and 100 nm or less, and even more preferably 10 nm or more and 80 nm or less. If the average particle diameter of the primary particles is within the above range, a good particle dispersion state can be obtained without impairing the transparency of the first surface low refractive index layer 45 and the second surface low refractive index layer 55. In particular, when hollow particles are used as low refractive index particles and the average particle diameter of the hollow particles is 70 nm or more and 80 nm or less, the refractive index is increased by increasing the porosity while maintaining the thickness of the outer shell that does not cause insufficient strength. It is suitable because it has an excellent balance with the ideal thickness (approximately 100 nm) of the first surface low refractive index layer 45 and the second surface low refractive index layer 55 for reducing the reflectance. It is.

The low refractive index particles used in this embodiment are preferably surface-treated. As the surface treatment of the low refractive index particles, surface treatment using a silane coupling agent is more preferable, and among these, surface treatment using a silane coupling agent having a (meth)acryloyl group is preferable. Surface treatment of low refractive index particles improves their affinity with the binder resin described below, makes the particles uniformly dispersed, and makes it difficult for particles to aggregate with each other. A decrease in transparency of the surface low refractive index layer 45 and the second surface low refractive index layer 55, a decrease in coatability of the layer forming composition, and a decrease in coating film strength of the composition are suppressed.

In addition, when the silane coupling agent has a (meth)acryloyl group, since the silane coupling agent has ionizing radiation curability, it easily reacts with the binder resin described below. Therein, the low refractive index particles are well fixed to the binder resin. That is, the low refractive index particles have a function as a crosslinking agent in the binder resin. This provides a tightening effect on the entire coating film, and imparts excellent surface hardness to the first surface low refractive index layer 45 and the second surface low refractive index layer 55 while retaining the original flexibility of the binder resin. It becomes possible to do so. Therefore, by deforming the first surface low refractive index layer 45 and the second surface low refractive index layer 55 by utilizing their own flexibility, they have absorbing power and restoring force against external impact, so that scratches are prevented from occurring. This results in a high surface hardness with excellent scratch resistance.

Silane coupling agents preferably used in surface treatment of low refractive index particles include 3-(meth)acryloxypropyltrimethoxysilane, 3-(meth)acryloxypropyltriethoxysilane, and 3-(meth)acryloxypropyl. Examples include methyldimethoxysilane, 3-(meth)acryloxypropylmethyldiethoxysilane, 2-(meth)acryloxypropyltrimethoxysilane, and 2-(meth)acryloxypropyltriethoxysilane.

The content of the low refractive index particles in the first surface low refractive index layer 45 and the second surface low refractive index layer 55 is 100 parts by mass of the resin of the first surface low refractive index layer 45 and the second surface low refractive index layer 55, respectively. It is preferably 10 parts by mass or more and 250 parts by mass or less, more preferably 50 parts by mass or more and 200 parts by mass or less, and even more preferably 100 parts by mass or more and 180 parts by mass or less. If the content of the low refractive index particles is within the above range, good antireflection properties and surface hardness can be obtained. Further, the proportion of hollow particles and/or porous particles in the total low refractive index particles contained in the first surface low refractive index layer 45 and the second surface low refractive index layer 55 may be 70% by mass or more, respectively. The content is preferably 80% by mass or more, more preferably 80% by mass or more and 95% by mass or less.

As the resin composition contained in the layer-forming coating liquid, a curable resin composition is first mentioned. As the curable resin composition, those similar to those exemplified in the description of the first surface hard coat layer 44 and the second surface hard coat layer 54 can be used, and an ionizing radiation curable resin composition is suitable. . Furthermore, as the resin composition, fluorine-containing polymers and fluorine monomers that themselves exhibit low refractive index properties are also preferably used. The fluorine-containing polymer is a polymer of a polymerizable compound containing at least a fluorine atom in its molecule, and is suitable in that it can impart antifouling properties and slipperiness. The fluorine-containing polymer preferably has a reactive group in its molecule and functions as a curable resin composition, and a fluorine-containing polymer having an ionizing radiation-curable reactive group and functions as an ionizing radiation-curable resin composition is preferable. More preferred.

As the fluorine-containing polymer, one that contains silicon together with fluorine is preferred in order not only to repel dirt on the surface of the low refractive index layer, but also to impart wipeability to the repelled dirt. For example, a silicone-containing vinylidene fluoride copolymer in which a silicone component is contained in a copolymer is preferably mentioned. In this case, examples of the silicone component include (poly)dimethylsiloxane, (poly)diethylsiloxane, (poly)diphenylsiloxane, (poly)methylphenylsiloxane, alkyl-modified (poly)dimethylsiloxane, azo-group-containing (poly)dimethylsiloxane, dimethylsilicone, phenylmethylsilicone, alkyl-aralkyl-modified silicone, fluorosilicone, polyether-modified silicone, fatty acid ester-modified silicone, methyl hydrogen silicone, silanol-group-containing silicone, alkoxy-group-containing silicone, phenol-group-containing silicone, methacryl-modified silicone, acrylic-modified silicone, amino-modified silicone, carboxylic acid-modified silicone, carbinol-modified silicone, epoxy-modified silicone, mercapto-modified silicone, fluorine-modified silicone, polyether-modified silicone, etc. Among them, those having a dimethylsiloxane structure are preferred.

The first surface low refractive index layer 45 and the second surface low refractive index layer 55 are made of, for example, low refractive index particles, a resin composition, additives such as an ultraviolet absorber and a leveling agent, and a diluent solvent, which are blended as necessary. A coating solution for layer formation is prepared, and the coating solution is applied to the outside of the first surface high refractive index layer 46 or the second surface high refractive index layer 56 by a conventionally known coating method, dried, and ionizing radiation is applied as necessary. It can be formed by irradiating and curing.

(First surface high refractive index layer and second surface high refractive index layer)
The first surface high refractive index layer 46 and the second surface high refractive index layer 56 utilize the difference in refractive index between the first surface low refractive index layer 45 and the second surface low refractive index layer 55, respectively. It serves to reduce the light reflectance of the first antireflection layer 40 and the second antireflection layer 50. The first surface high refractive index layer 46 and the second surface high refractive index layer 56 can each be formed, for example, from a layer-forming coating liquid containing a curable resin composition and high refractive index particles.

The first surface high refractive index layer 46 and the second surface high refractive index layer 56 should have a high refractive index from the viewpoint of making the first surface antireflection layer 40 and the second surface antireflection layer 50 extremely low reflectance. However, increasing the refractive index requires a large amount of high refractive index particles, leading to aggregation of the high refractive index particles, which causes whitening. Therefore, the refractive index is preferably 1.55 or more and 1.85 or less, more preferably 1.56 or more and 1.70 or less. Further, the thickness of the first surface high refractive index layer 46 and the second surface high refractive index layer 56 is preferably 200 nm or less, more preferably 50 nm or more and 180 nm or less. In addition, when the first surface high refractive index layer 46 and the second surface high refractive index layer 56 each have a two-layer structure described below, it is preferable that the total thickness of the two layers satisfies the above value. Further, the first surface high refractive index layer 46 and the second surface high refractive index layer 56 may be formed from a plurality of layers satisfying the above refractive index range, but from the viewpoint of cost effectiveness, two or less layers are required. Preferably, a single layer is more preferable.

High refractive index particles include antimony pentoxide (1.79), zinc oxide (1.90), titanium oxide (2.3 or more and 2.7 or less), cerium oxide (1.95), tin-doped indium oxide (1 .95 or more and 2.00 or less), antimony-doped tin oxide (1.75 or more and 1.85 or less), yttrium oxide (1.87), and zirconium oxide (2.10). Note that the value in parentheses above indicates the refractive index of the material of each particle. Among these high refractive index particles, those having a refractive index of more than 2.0 are preferred from the viewpoint of achieving the above-mentioned suitable refractive index with a small amount of addition. Furthermore, conductive high refractive index particles such as antimony pentoxide, tin-doped indium oxide (ITO), and antimony-doped tin oxide (ATO) have free electrons whose plasma frequency is in the near-infrared region. Due to plasma oscillations, some of the light in the visible light range is also absorbed or reflected, making it difficult to suppress the color tone. For this reason, the high refractive index particles are preferably non-conductive. From the above, among the high refractive index particles exemplified above, titanium oxide and zirconium oxide are suitable, and zirconium oxide is most suitable from the viewpoint of high durability stability such as light resistance. In addition, when it is desired to impart antistatic properties to the first surface antireflection layer 40 and the second surface antireflection layer 50, the first surface high refractive index layer 46 and the second surface high refractive index layer 56 are coated with two layers as described below. As for the layer structure, it is preferable that one layer contains conductive high refractive index particles.

The average particle diameter of the primary particles of the high refractive index particles is preferably 5 nm or more and 200 nm or less, more preferably 5 nm or more and 100 nm or less, and even more preferably 10 nm or more and 80 nm or less. The average particle diameter of the primary particles of the high refractive index particles and the low refractive index particles described below can be calculated by the following operations (1) to (3).
(1) SEM, TEM, or STEM surface images are taken of the particles themselves or a dispersion of the particles coated and dried on a transparent substrate.
(2) Extract ten arbitrary particles from the surface image, measure the major axis and minor axis of each particle, and calculate the particle diameter of each particle from the average of the major axis and minor axis. The major axis is the longest axis on the screen, and the minor axis is the distance between two points where a line segment perpendicular to the midpoint of the line segment that makes up the major axis intersects with the particle. shall be taken as a thing.
(3) Perform the same operation five times to capture images of different screens of the same sample, and use the value obtained from the number average of the particle diameters of a total of 50 particles as the average particle diameter.
In addition, when calculating the average particle size of particles, when the average particle size to be calculated is on the order of μm, it is preferable to use SEM, and when the average particle size to be calculated is on the order of nm, it is preferable to use TEM or STEM. . In the case of SEM, the accelerating voltage is preferably 1 kV or more and 10 kV or less, and the magnification is 1000 times or more and 7000 times or less, and in the case of TEM or STEM, the accelerating voltage is 10 kV or more and 30 kV or less, and the magnification is 50,000 or more and 300,000 times or less. It is preferable to do so.

The content of the high refractive index particles is preferably 30 parts by mass or more and 400 parts by mass or less, based on 100 parts by mass of the curable resin composition, from the viewpoint of a balance between increasing the refractive index, suppressing color, and suppressing whitening. It is preferably 50 parts by mass or more and 200 parts by mass or less, and even more preferably 80 parts by mass or more and 150 parts by mass or less.

The first surface high refractive index layer 46 and the second surface high refractive index layer 56 are preferably dispersion-stabilized in order to suppress excessive aggregation of the high refractive particles. As a means for dispersion stabilization, for example, a means for adding another high refractive index particle having a smaller amount of surface charge than the high refractive index particle to the high refractive index particle serving as the base particle can be mentioned. According to this means, the base high refractive index particles gather appropriately around the other high refractive index particles, and it is possible to suppress excessive aggregation of the base high refractive index particles. Other means for stabilizing dispersion include using surface-treated high refractive index particles and adding a dispersant to the layer-forming coating solution.

The curable resin compositions forming the first surface high refractive index layer 46 and the second surface high refractive index layer 56 are those exemplified in the description of the first surface hard coat layer 44 and the second surface hard coat layer 54. Similar materials can be used, and ionizing radiation-curable resin compositions are preferred. Further, in order to obtain the above-mentioned refractive index without adding excessive amounts of high refractive index particles, it is preferable to use a curable resin composition with a high refractive index. The refractive index of the curable resin composition is preferably about 1.54 or more and 1.70 or less.

Here, as described above, the first surface high refractive index layer 46 may include the first first surface high refractive index layer 47 and the second first surface high refractive index layer 48. In this case, the refractive index of the first first surface high refractive index layer 47 is preferably higher than the refractive index of the second first surface high refractive index layer 48. Thereby, the difference in refractive index between the first surface high refractive index layer 46 and the first surface low refractive index layer 45 can be increased, the reflectance of the first surface antireflection layer 40 can be reduced, and the first surface height can be increased. The difference in refractive index between the refractive index layer 46 and the first surface hard coat layer 44 can be reduced, and the generation of interference fringes can be suppressed.

As described above, the second-side high refractive index layer 56 may include a first second-side high refractive index layer 57 and a second second-side high refractive index layer 58. In this case, similar to the first-side high refractive index layer 46, it is preferable that the refractive index of the first second-side high refractive index layer 57 is higher than that of the second second-side high refractive index layer 58. This makes it possible to increase the refractive index difference between the second-side high refractive index layer 56 and the second-side low refractive index layer 55, thereby lowering the reflectance of the second-side anti-reflection layer 50 and reducing the refractive index difference between the second-side high refractive index layer 56 and the second-side hard coat layer 54, thereby suppressing the occurrence of interference fringes.

In addition, when the first surface high refractive index layer 46 and the second surface high refractive index layer 56 each have a two-layer structure, the first first surface high refractive index layer 47 and the first second surface high refractive index layer The refractive index of the second first surface high refractive index layer 48 and the second second surface high refractive index layer 58 are preferably 1.60 or more and 1.85 or less, respectively. It is preferably 1.55 or more and 1.70 or less. Furthermore, in the above two-layer structure, one layer contains conductive high refractive index particles, the other layer contains non-conductive high refractive index particles, and [containing conductive high refractive index particles] It is preferable that the thickness of the layer <thickness of the layer containing non-conductive high refractive index particles]. With this configuration, antistatic properties can be imparted while suppressing the amount of conductive high refractive index particles added that may cause color tint. In addition, conductive high refractive index particles are preferable because they can impart antistatic properties with a small amount of addition by forming a network within the layer, and can further suppress discoloration and whitening.

The first surface high refractive index layer 46 and the second surface high refractive index layer 56 are made of high refractive index particles, a curable resin composition, additives such as an ultraviolet absorber and a leveling agent, and a diluent solvent, which are blended as necessary. A layer-forming coating solution is prepared, and the coating solution is applied to the outside of the first surface hard coat layer 44 or the second surface hard coat layer 54 by a conventionally known coating method, dried, and irradiated with ionizing radiation as necessary. It can be formed by curing.

[Transparent adhesive layer, first transparent adhesive layer, and second transparent adhesive layer]
The transparent adhesive layers such as the transparent adhesive layer 31, the first transparent adhesive layer 31a, and the second transparent adhesive layer 31b are used to bond the first antireflection layer 40, the second antireflection layer 50, the core layer 32, etc. to each other. It is a layer. Here, the "transparent adhesive layer" in this specification is a concept that includes a transparent adhesive layer. The transparent adhesive layer can be formed using various adhesives commonly used as adhesives. Examples include acrylic adhesives, urethane adhesives, olefin adhesives, rubber adhesives, silicone adhesives, and polyester adhesives. Acrylic pressure-sensitive adhesives are preferred because they have high transparency and can increase adhesive strength.

Each of the above-mentioned pressure-sensitive adhesives can contain various functionalizing agents, stabilizing agents, etc. within a range that does not impede transparency. Additionally, a tackifier can be added to increase the adhesive strength. Further, a crosslinked structure can be created using a crosslinking agent such as isocyanate, epoxy, or a double bond-containing compound depending on each resin.

The transparent adhesive layer can also be formed using an adhesive (OCA, Optical Clear Adhesive) that has a release film laminated on both sides. Commercially available products can also be used, such as the optically transparent adhesive sheet LUCIACS series (manufactured by Nitto Denko Corporation), highly transparent double-sided tape 5400A series (manufactured by Sekisui Chemical Co., Ltd.), optical adhesive sheet Opteria series (manufactured by Lintec Corporation), SANCUARY series (manufactured by San-A Kaken Co., Ltd.), optically transparent adhesive OAD series (manufactured by Toyo Packaging Co., Ltd.), optical coreless double-sided tape RA series (manufactured by Sumiron Co., Ltd.), and Panaclean series PD-S1 (manufactured by Panac Corporation). The adhesive strength of these adhesives is generally 10 N/25 mm or more.

The thickness of the transparent adhesive layer is not particularly limited, but is preferably, for example, 2 μm or more and 200 μm or less. When the thickness of the transparent adhesive layer is 2 μm or more, the first antireflection layer 40 and the second antireflection layer 50, etc. can be reliably bonded, and when the thickness of the transparent adhesive layer is 200 μm or less, If so, transparency (light transmittance) can be maintained. The lower limit of the thickness of the transparent adhesive layer is more preferably 5 μm or more, 10 μm or more, or 15 μm or more, and the upper limit is more preferably 150 μm or less, 160 μm or less, or 170 μm or less.

The method for forming the transparent adhesive layer is not particularly limited, and any known method used for manufacturing adhesive tapes and the like can be employed. Specifically, a method of applying a coating of an adhesive composition in which each component forming the transparent adhesive layer described above is dissolved or dispersed in a suitable organic solvent or water to the surface of a base material, and drying and curing. , any method such as a method of coating each component forming the above-mentioned transparent adhesive layer, a double bond-containing monomer, an oligomer, a crosslinking agent, etc. on a base material without a solvent, and then crosslinking with radiation, etc., an extrusion lamination method, etc. can be formed with.

When using OCA, the transparent adhesive layer can be formed by peeling off the release film on the easy-release side of OCA and bonding the adhesive surface to the base material.

[Core layer]
The core layer 32 serves to support the first antireflection layer 40 and the second antireflection layer 50 . Preferably, core layer 32 contains polyethylene terephthalate. Note that as the material of the core layer 32, the same materials as those of the first side transparent base layer 42 and the second side transparent base layer 52 described above can be used.

The thickness of the core layer 32 is not particularly limited and is appropriately selected depending on the application. The thickness of the core layer 32 may be approximately 5 μm or more and 130 μm or less, and is preferably 10 μm or more and 100 μm or less in consideration of durability, handleability, and the like.

[Printing layer]
The printed layer 33 is a layer on which letters, pictures, etc. are printed, and is a layer for forming a printed area 35 on the low-reflection film 30. The printing layer 33 mainly contains one or more of ordinary ink vehicles, and if necessary, a plasticizer, a stabilizer, an antioxidant, a light stabilizer, an ultraviolet absorber, a curing agent, a crosslinking agent, One or more of lubricants, antistatic agents, fillers, and other additives are optionally added, and colorants such as dyes and pigments are added, and thoroughly kneaded with solvents, diluents, etc. An ink composition obtained by adjusting an ink composition can be used. Such ink vehicles include, for example, linseed oil, tung oil, soybean oil, hydrocarbon oil, rosin, rosin ester, rosin modified resin, shellac, alkyd resin, phenolic resin, maleic resin, natural resin, carbonized Hydrogen resin, polyvinyl chloride resin, polyacetic acid resin, polystyrene resin, polyvinyl butyral resin, acrylic or methacrylic resin, polyamide resin, polyester resin, polyurethane resin, epoxy resin, urea resin, melamine resin, One or more of aminoalkyd resins, nitrocellulose, ethylcellulose, chlorinated rubber, cyclized rubber, and others may be used in combination. The printing method may be letterpress printing, screen printing, transfer printing, flexo printing, inkjet printing, or other printing methods in addition to gravure printing.

The above-described low reflection film 30 preferably has a thickness of 500 μm or less. Furthermore, the above-described low reflection film 30 may have a thickness of 60 μm or more. When the thickness of the low-reflection film 30 is 60 μm or more, stiffness and strength that can maintain the shape of the low-reflection film 30 can be obtained. Thereby, the low reflection film 30 can be used in various applications such as a low reflection film 100 with a support portion, a book cover 81, and a book 82, which will be described later. Further, since the thickness of the low reflection film 30 is 500 μm or less, the transparency of the transparent region 34 of the low reflection film 30 can be improved. The low reflection film 30 may have a thickness of 300 μm or less, or 250 μm or less.

Moreover, it is preferable that the low reflection film 30 described above has a restoring function. Thereby, when the low reflection film 30 is bent or rolled up, the low reflection film 30 can be restored to its flat shape. Here, the restorability function means that even after the object (low-reflection film 30) is bent for a certain period of time, no creases are formed on the bent object, and the object remains in a flat shape. means the ability to restore.

The above-described low reflection film 30 has a bending stress of, for example, 6 N/20 mm or less. Note that the bending stress of the low reflection film 30 is measured by the following method. First, a sample S with a size of 20 mm x 50 mm is cut out from the low reflection film 30. Also, a measuring device 73 is prepared. As the measuring device 73, a tensile compression tester (manufactured by A&D, MCT-2150) can be used. As shown in FIG. 2L, this measuring device 73 includes a pair of support stands 71 and an indenter 72. Then, a pair of support stands 71 are placed apart from each other, and the sample S is placed on the support stands 71. Next, the sample S is deformed by pressing the indenter 72 against the sample S. Then, when the distance D2 between the tip of the indenter 72 and the upper end of the support base 71 (that is, the amount of deformation of the sample S) becomes 2 mm, the load applied to the indenter 72 is Let it be bending stress. The distance between the pair of support stands 71 can be 10 mm. As the support stand 71, a support stand 71 having a semicircular upper end shape with a radius of 5 mm in a cross section taken in the direction in which the support stands 71 are spaced apart from each other and in the up-down direction can be used. Further, as the indenter 72, a member similar to the support base 71 can be used, the tip of which has a semicircular shape with a radius of 5 mm in a cross section taken in the direction in which the support bases 71 are separated from each other and in the vertical direction.

Here, the visible light reflectance can be measured by the following method in accordance with JISR3106:2019. First, light is irradiated onto the first surface 301 or the second surface 302 of the low reflection film 30 so that the incident angle is 5 degrees. Then, the visible light reflectance can be measured based on the specularly reflected light of the incident light. Here, in this specification, visible light reflectance refers to spectrum data obtained every 10 nm from wavelength 380 nm to 780 nm by irradiating light including wavelengths from 380 nm to 780 nm, in accordance with JISR3106:2019. It is calculated based on

The visible light reflectance in the transparent region 34 of the low reflection film 30 is 2% or less. That is, as described above, the regular reflectance of visible light that enters the central region 30e of the transparent region 34 of the low reflection film 30 from the first surface 301 side is 2% or less. The regular reflectance of visible light that enters the transparent region 34 of the low reflection film 30 from the first surface 301 side is measured as follows. First, a sample with a size of 30 mm x 30 mm is cut out from the transparent area 34 of the low reflection film 30. Next, the surface of the sample (the surface forming the first surface 301 of the low reflection film 30) is irradiated with light such that the incident angle is 5°. At this time, the surface of the sample is irradiated with light containing wavelengths from 380 nm to 780 nm. Then, using a spectrophotometer (manufactured by JASCO Corporation, V-7100), the reflection spectrum of light was measured every 10 nm from wavelength 380 nm to 780 nm, and based on the acquired spectrum data, the visible light reflectance was determined. Calculate.

Further, it is preferable that the visible light transmittance (JISR3106:2019) of the low reflection film 30 is 90% or more. The visible light transmittance of the low reflection film 30 is measured as follows. First, a sample with a size of 30 mm x 30 mm is cut out from the low reflection film 30. Next, the surface of the sample is irradiated with light containing wavelengths from 380 nm to 780 nm at an incident angle of 5°. Then, using a spectrophotometer (manufactured by JASCO Corporation, V-7100), the transmission spectrum of the light transmitted through the low reflection film 30 at an angle of 5°, that is, the same angle as the incident angle, is measured. The measurement of the light transmission spectrum is performed at all wavelengths from 380 nm to 780 nm that differ by 10 nm. Then, visible light transmittance is calculated based on the measured transmission spectrum. Since the visible light transmittance of the low-reflection film 30 is 90% or more, the visibility of the low-reflection film 30 when viewed from the first surface 301 side is further improved, and the low-reflection film 30 is Visibility when viewed from the side can be further improved. Further, the visible light transmittance of the low reflection film 30 is more preferably 92% or more, and even more preferably 95% or more. Moreover, the haze (JISK7136:2000) of the low reflection film 30 is preferably 3.0% or less, more preferably 2.0% or less, and even more preferably 1.5% or less.

According to the low reflection film 30 as described above, reflection of light in the transparent region 34 of the low reflection film 30 is suppressed. Moreover, according to the low reflection film 30 as described above, transparency in the transparent region 34 is ensured. This makes it difficult for an observer of the low-reflection film 30 to recognize the existence of the transparent region 34 of the low-reflection film 30. According to such a low reflection film 30, the design of the low reflection film 30 can be improved.

Here, there is a concern that the low-reflection film 30 may be particularly easily recognized near the outer edge 30a. For example, when the outer edge 30a is formed on the low-reflection film 30 by cutting the low-reflection film 30, the function of suppressing light reflection by the low-reflection film 30 may be impaired in the vicinity of the outer edge 30a. For example, the surface of the low reflection film 30 may not be smooth. In particular, the vicinity of the outer edge 30a may have a rough shape. Further, there is a possibility that a curved surface is formed near the outer edge 30a. In these cases, there is a concern that the low reflection film 30 may be easily recognized in the vicinity of the outer edge 30a due to diffuse reflection of light in the vicinity of the outer edge 30a. Furthermore, when the outer edge 30a is formed on the low-reflection film 30 by cutting the low-reflection film 30, the first surface antireflection layer 40 or the second surface antireflection layer 50 is damaged near the outer edge 30a. There is also a possibility that the function of suppressing light reflection by the low reflection film 30 may be impaired. If the low-reflection film 30 is easily visible near the outer edge 30a, there is a possibility that realizing various expressions using the low-reflection film 30 will be hindered. As an example, consider a case where the low reflection film 30 of this embodiment is used with the intention of giving the viewer the impression that characters, patterns, etc. formed in the print area 35 are floating in the air. In this case, the low reflection film 30 may be visually recognized near the outer edge 30a, which may prevent the viewer from receiving this impression.

The inventors of the present invention have conducted extensive research into the low-reflection film 30, and as a result have discovered a feature of the outer edge 30a that is difficult to see in the vicinity thereof. The following describes the feature of the low-reflection film 30 of the present embodiment, in the vicinity of the outer edge 30a.

FIG. 3A is an enlarged plan view showing a portion surrounded by a dashed line labeled IIIA in FIG. 1. FIG. When the low reflection film 30 is irradiated with light perpendicular to the surface of the low reflection film 30, the intensity of the reflected light becomes particularly large near the outer edge 30a, which can have a rough shape, and tends to decrease as it moves away from the outer edge 30a. Conceivable. Therefore, it is considered that a region where the intensity of reflected light is high is formed in the low reflection film 30 along the outer edge 30a. Here, when the low reflection film 30 is irradiated with light perpendicular to the surface of the low reflection film 30, the intensity of the specularly reflected light is compared to the intensity of the specularly reflected light from the central region 30e of the low reflection film 30. A continuous region in which the distance from the outer edge 30a is 1.2 times or more, extends in the direction in which the outer edge 30a extends, and is 100 μm or less from the outer edge 30a is defined as a first outer edge region 30d. In particular, in this embodiment, the first outer edge region 30d is defined as follows. The low reflection film 30 is irradiated with light perpendicular to the first surface 301 of the low reflection film 30, from the first surface 301 side of the low reflection film 30 and in the direction perpendicular to the first surface 301 of the low reflection film 30. Observe the low reflection film 30 from below. In this case, the intensity of the reflected light, which is visible light specularly reflected on the first surface 301 side, is the intensity of the reflected light, which is visible light specularly reflected on the first surface 301 side of the central region 30e of the low reflection film 30. A continuous region that is 1.2 times or more larger than the first outer edge region 30d, which extends in the direction in which the outer edge 30a extends, and whose distance from the outer edge 30a is 100 μm or less is defined as a first outer edge region 30d.

Note that the "continuous area where the intensity of the specularly reflected light is 1.2 times or more compared to the intensity of the specularly reflected light from the central area 30e of the low reflection film 30" referred to here is the area where the outer edge 30a extends. This is a region where the intensity of the reflected light that is specularly reflected continuously in the direction perpendicular to the direction is 1.2 times or more compared to the intensity of the reflected light that is specularly reflected from the central region 30e of the low reflection film 30. .

In addition, a region "100 μm or less away from the outer edge 30a" means that the distance from the outer edge 30a to the part of the region closest to the outer edge 30a is 100 μm or less. In FIG. 3A, the first outer edge region 30d is formed along the outer edge 30a. In FIG. 3A, the first outer edge region 30d is in contact with the outer edge 30a. In other words, the distance between the first outer edge region 30d and the outer edge 30a is 0.

In addition, when the printing area 35 is located near the outer edge 30a, such as when a part of the outer edge 30a of the low reflection film 30 is formed by the printing area 35, the first outer edge area 30d is defined as follows. . A continuous region in which the intensity of the specularly reflected light is 1.2 times or more as compared to the intensity of the specularly reflected light from the central region 30e of the low reflection film 30, extending in the direction in which the outer edge 30a extends, and A portion formed by the transparent region 34 and having a distance of 100 μm or less from the outer edge 30a is defined as a first outer edge region 30d.

When defining the first outer edge region 30d as described above, in the low reflection film 30 of this embodiment, the width W1 of the first outer edge region 30d is smaller than 100 μm. In the example shown in FIG. 3A, the width W1 of the first outer edge region 30d is constant in the direction in which the outer edge 30a extends. Although not shown, the width W1 of the first outer edge region 30d may not be constant in the direction in which the outer edge 30a extends. The width W1 of the first outer edge region 30d may be smaller than 100 μm over the entire outer edge 30a. As will be described later, when the low reflection film 30 is supported by the support section 70 so that a part of the outer edge 30a is exposed, the first outer edge region 30d formed along the exposed part of the outer edge 30a is The width W1 may be smaller than 100 μm. Note that the case where the width W1 is smaller than 100 μm also includes the case where the width W1 is 0, that is, the case where the first outer edge region 30d is not formed in the low reflection film 30. Since the width W1 of the first outer edge region 30d is smaller than 100 μm, the width W1 of the first outer edge region 30d, which is a region formed along the outer edge 30a and has a high intensity of reflected light, becomes sufficiently narrow.

Normally, the first outer edge region 30d, which is a continuous region where the intensity of the specularly reflected light is 1.2 times or more compared to the intensity of the specularly reflected light from the central region 30e, is observed from the outside. It looks white. If such a white-looking region appears with a large width near the outer edge 30a of the low-reflection film 30, the outer edge 30a of the low-reflection film 30 becomes conspicuous, making the presence of the low-reflection film 30 noticeable. . According to the present embodiment, the width W1 of the first outer edge region 30d is a continuous region in which the intensity of the specularly reflected light is 1.2 times or more as compared to the intensity of the specularly reflected light from the central region 30e. Since the outer edge 30a of the low-reflection film 30 and the presence of the low-reflection film 30 are suppressed to be less than 100 μm, the outer edge 30a of the low-reflection film 30 and the presence of the low-reflection film 30 are prevented from being noticeable. Therefore, without making the presence of the low-reflection film 30 noticeable, it is possible to give the viewer the impression that the characters, patterns, etc. formed in the print area 35 are floating in the air. As described above, according to the low reflection film 30 in which the width W1 of the first outer edge region 30d is smaller than 100 μm, the low reflection film 30 becomes difficult to be visually recognized near the outer edge 30a, and various expressions can be achieved using the low reflection film 30. realizable.

The central region 30e, whose intensity of reflected light is compared with the region near the outer edge 30a, is a region of the transparent region 34 of the low-reflection film 30 that is sufficiently far away from the outer edge 30a. As the central region 30e, for example, an area that is 1 cm or more away from the outer edge 30a and has no scratches on the low reflection film 30 can be selected.

The ratio of the intensity of the reflected light specularly reflected in the area near the outer edge 30a of the low reflection film 30 to the intensity of the reflected light specularly reflected from the central area 30e is calculated by the following method. First, while irradiating the first surface 301 side of the low reflection film 30 with light perpendicular to the first surface 301 of the low reflection film 30, a digital photograph of the area near the outer edge 30a and the central area 30e of the low reflection film 30 is taken. to photograph. A digital photograph is taken from the first surface 301 side of the low reflection film 30 and in a direction perpendicular to the first surface 301 of the low reflection film 30. A digital photograph can be taken by taking an enlarged image of the area near the outer edge 30a and the central area 30e using an optical microscope or the like. In this case, the light source included in the optical microscope may irradiate the first surface 301 side of the low reflection film 30 with light perpendicular to the first surface 301 of the low reflection film 30 . Thereafter, the digital photograph taken is analyzed to obtain the brightness values in the area near the outer edge 30a and the central area 30e of the low-reflection film 30. Acquisition of brightness values by analyzing digital photographs can be performed using image processing software ImageJ. Thereby, the ratio of the brightness value of the area near the outer edge 30a of the low reflection film 30 to the brightness value of the central area 30e can be obtained. The acquired brightness value can be regarded as the intensity of specularly reflected light. Further, the ratio of the obtained luminance values can be regarded as the ratio of the intensity of the reflected light specularly reflected in the area near the outer edge 30a of the low reflection film 30 to the intensity of the reflected light specularly reflected from the central area 30e. . That is, the first outer edge area 30d can be specified as an area where the ratio of the brightness values is 1.2 or more. Note that, more specifically, as a method for measuring the ratio of brightness values, the method for measuring the ratio of brightness values in "(1) Test for measuring the width of the first outer edge region" in Examples described later can be adopted. Further, as a method for measuring the width W1 of the first outer edge region 30d, a method for measuring the width W1 of the first outer edge region 30d in "(1) Width measurement test of the first outer edge region" of the embodiment described later can be adopted.

In addition, when the low reflection film 30 is irradiated with light perpendicular to the second surface 302 of the low reflection film 30, the intensity of the reflected light that is specularly reflected on the second surface 302 side that is formed along the outer edge 30a is low. A continuous region having an intensity of 1.2 times or more compared to the intensity of the reflected light specularly reflected on the second surface 302 side of the central region 30e of the film 30, extending in the direction in which the outer edge 30a extends, and extending from the outer edge 30a. The width of the region where the distance is 100 μm or less may be smaller than 100 μm. That is, by irradiating the low-reflection film 30 with light perpendicular to the second surface 302 of the low-reflection film 30, an area satisfying the conditions of the first outer edge region 30d was considered on the second surface 302 side of the low-reflection film 30. Sometimes the width of the region may be less than 100 μm.

Furthermore, the maximum value of the intensity of reflected light in an environment where light is irradiated from multiple directions within a strip-shaped region 30f having a width of 5 mm along the outer edge 30a is determined by It is more preferable that the intensity of the reflected light is 2.0 times or less as compared to the average value of the intensity of the reflected light in the environment. Here, the "environment in which light is irradiated from multiple directions" is not particularly limited as long as the direction in which the low reflection film 30 is irradiated with light is not limited to one direction. When measuring the intensity of reflected light in an environment where light is irradiated from multiple directions, the reference position for measuring the intensity of reflected light is set at the point where the incident light from the light source is specularly reflected on the surface of the low-reflection film 30. You can choose a location where you have nothing to do. For example, it is a normal room with lights on, especially a room with normal brightness including fluorescent lights lit on the ceiling. In addition, the “intensity of reflected light in an environment where light is irradiated from multiple directions within the band-shaped region 30f” is calculated from the first surface 301 side of the low-reflection film 30 and from the first surface 301 of the low-reflection film 30. This is the intensity of reflected visible light when the band-shaped region 30f is observed from the vertical direction. The band-shaped region 30f is a region that contacts the outer edge 30a, extends in the direction in which the outer edge 30a extends, and has a width of 5 mm in a direction perpendicular to the direction in which the outer edge 30a extends. More specifically, the maximum value of the intensity of reflected light in an environment where light is irradiated from multiple directions within the strip area 30f on the first surface 301 side is the same as the maximum value of the intensity of reflected light in an environment where light is irradiated from multiple directions within the strip area 30f. It is preferable that the intensity is 2.0 times or less as compared to the average value of the intensity of reflected light in the irradiated environment.

The maximum value of the intensity of reflected light in an environment where light is irradiated from multiple directions within a strip-shaped region 30f having a width of 5 mm along the outer edge 30a is an environment where light is irradiated from multiple directions within the strip-shaped region 30f. By making the intensity of the reflected light 2.0 times or less as compared to the average value of the reflected light intensity, the following effects can be obtained. At a position at a distance of 5 mm or less from the outer edge 30a, particularly in the vicinity of the outer edge 30a, not only the intensity of specularly reflected light but also the intensity of diffusely reflected light tends to increase. For example, when the vicinity of the outer edge 30a of the low reflection film 30 has a rough shape, light is diffusely reflected in the vicinity of the outer edge 30a, and the intensity of the diffusely reflected light increases in the vicinity of the outer edge 30a. is assumed. Here, the intensity of reflected light in an environment where light is irradiated from multiple directions is considered to be the sum of the intensity of specularly reflected light and the intensity of diffusely reflected light. Therefore, the maximum value of the intensity of reflected light in an environment where light is irradiated from multiple directions within the strip-shaped region 30f is the maximum value of the intensity of reflected light within the strip-shaped region 30f in an environment where light is irradiated from multiple directions. By being 2.0 times or less compared to the average value of is determined to be smaller. This makes it more difficult for the low reflection film 30 to be visually recognized near the outer edge 30a.

The maximum value of the intensity of reflected light in an environment where light is irradiated from multiple directions within the strip area 30f, and the average value of the intensity of reflected light within the strip area 30f in an environment where light is irradiated from multiple directions. As a method for measuring the ratio to A method of measuring the ratio of light intensities can be adopted.

In addition, the maximum value of the intensity of reflected light in an environment where light is irradiated from multiple directions within the strip-shaped region 30f on the second surface 302 side is the same as an environment where light is irradiated from multiple directions within the strip-shaped region 30f. It is preferable that the average value of the intensity of the reflected light is 2.0 times or less.

(Low reflection film with support part)
Next, a low reflection film 100 with a support portion in which the above-described low reflection film 30 is used will be explained. FIG. 3B is a perspective view showing an example of the low reflection film 100 with a support portion. FIG. 3C is a perspective view showing another example of the low reflection film 100 with a support portion. As shown in FIGS. 3B and 3C, the low-reflection film 100 with a support section includes a low-reflection film 30 and a support section 70 that supports the low-reflection film 30.

The support 70 supports the low-reflection film 30 so that at least a part of the outer edge 30a of the low-reflection film 30 is exposed. In the example shown in FIG. 3B and FIG. 3C, the support 70 supports the low-reflection film 30 so that at least one side forming the outer edge 30a of the low-reflection film 30 is exposed. In the example shown in FIG. 3B and FIG. 3C, the support 70 holds one side forming the outer edge 30a of the rectangular low-reflection film 30. In the example shown in FIG. 3B, the support 70 holds the lower edge 30b2 of the low-reflection film 30. In the example shown in FIG. 3C, the support 70 holds the upper edge 30b1 of the low-reflection film 30. As a result, the support 70 supports the low-reflection film 30 so that three sides forming the outer edge 30a of the low-reflection film 30 are exposed.

As described above, by increasing the thickness of the low reflection film 30, particularly by making the thickness 60 μm or more, stiffness and strength that can maintain the shape of the low reflection film 30 can be obtained. By using the low-reflection film 30 with firmness and strength ensured in this way, the low-reflection film 30 is can support.

In the example shown in FIG. 3B, the support portion 70 is a rod-shaped member in which a groove portion 79 is formed. The lower edge 30b2 of the low reflection film 30 is inserted into the groove 79 of the support portion 70. Furthermore, in the example shown in FIG. 3B, the low reflection film 30 is loosely held by the support section 70. In particular, the low reflection film 30 is supported by the support part 70 in a movable state relative to the support part 70.

In the example shown in FIG. 3B, the support portion 70 is curved. In particular, the support portion 70 is curved in an S-shape. In the example shown in FIG. 3B, the support section 70 is configured by a single member.

As shown in FIG. 3B, the support portion 70 is formed with a groove portion 79 into which the lower second side 30b (lower edge 30b2) of the pair of second sides 30b of the low-reflection film 30 is inserted. This groove portion 79 extends along the horizontal direction. Furthermore, the groove portion 79 is curved when observed from the direction in which the low-reflection film 30 is inserted. In the illustrated example, the groove portion 79 is curved in an S-shape.

Further, as shown in FIG. 3B, a gap is formed between the low reflection film 30 and the groove portion 79. Specifically, a gap is formed between the low reflection film 30 and the groove portion 79 in the thickness direction of the low reflection film 30. In this way, the low reflection film 30 is inserted into the groove 79 with some play. Thereby, the low reflection film 30 is supported by the support part 70 in a movable state with respect to the support part 70. In this case, the entire first side (side edge) 30c of the low reflection film 30 may be exposed to the outside.

In the example shown in FIG. 3B, the low reflection film 30 is inserted into the groove 79 in an elastically deformed state so as to be curved in an S-shape. In this case, the low reflection film 30 is deformed within the groove 79 so as to extend linearly in plan view. As a result, the low reflection film 30 is supported by the support section 70 in a curved state. In the example shown in FIG. 3B, the low reflection film 30 is supported by the support portion 70 in a curved S-shape. Since the low-reflection film 30 is curved, even if the low-reflection film 30 is supported only by the grooves 79, bending of the low-reflection film 30 in the vertical direction can be suppressed. Therefore, the low reflection film 30 can be made independent.

In the example shown in FIG. 3C, the support portion 70 is a rod-shaped member having a clamping portion 72a that holds the upper edge 30b1 of the low-reflection film 30 by clamping it. In the example shown in FIG. 3C, the support portion 70 has a base portion 72c and a clamping portion 72a that extends from the base portion 72c. The clamping portion 72a has a first clamping portion 72d and a second clamping portion 72e that each extend from the base portion 72c.

The base 72c is a plate-shaped member. The base portion 72c has a plate surface that is parallel to the vertical direction and parallel to the thickness direction of the low reflection film 30. The first holding portion 72d extends from one end of the base portion 72c toward the center of the low reflection film 30. The second holding portion 72e extends from the other end of the base portion 72c toward the center of the low reflection film 30. Note that one end and the other end of the base portion 72c mean ends of the low reflection film 30 in the thickness direction. In FIG. 3C, the upper edge 30b1 is sandwiched between the first clamping part 72d and the second clamping part 72e.

The support part 70 shown in FIG. 3C has a low reflection film 30 sandwiched between the first clamping part 72d and the second clamping part 72e. The reflective film 30 can be held. In the example shown in FIG. 3C, the support part 70 holds the upper edge 30b1 of the low reflection film 30 by sandwiching the upper edge 30b1 of the low reflection film 30 between the first clamping part 72d and the second clamping part 72e. are doing.

In the example shown in FIG. 3C, the support section 70 supports the low reflection film 30 in a flattened state. By supporting the low reflection film 30 in a flattened state by the support portion 70, reflection of light on the low reflection film 30 can be effectively suppressed. As an example, the base 72c of the support part 70 shown in FIG. 3C is fixed to the ceiling on the side opposite to the side from which the clamping part 72a extends. In this case, the base 72c may be fixed to the ceiling by being directly joined to the ceiling, or may be fixed to the ceiling via a member that is joined to both the base 72c and the ceiling. Thereby, the low-reflection film 30 can be suspended from the ceiling by the support portion 70, and the low-reflection film 30 can be supported in a flat state using the action of gravity.

According to the low-reflection film 100 with a support part as shown in FIGS. 3B and 3C, the characters, patterns, etc. formed in the print area 35 by the print layer 33 are visible in the air to an observer who visually recognizes the low-reflection film 30. It can give the impression of floating. Further, by arranging the plurality of low reflection films 30 so as to be lined up in the thickness direction of the low reflection films 30 using one or more support parts 70, the following effects can be further obtained. It is possible to give an impression to the observer that each of the characters, patterns, etc. formed in the printing area 35 of the plurality of low reflection films 30 is floating in the air at different positions in the thickness direction of the low reflection film 30. . This makes it possible to realize a three-dimensional representation that changes in appearance depending on the viewing direction of the observer.

Method for manufacturing low reflection film and low reflection film with support portion Next, a method for manufacturing the low reflection film 30 and the low reflection film 100 with support portion according to the present embodiment will be described. Here, first, a method for manufacturing the low reflection film 30 will be described. As an example, as shown in FIGS. 2A to 2H, a core layer 32, a printed layer 33 provided on one side of the core layer 32, a first surface antireflection layer 40, and a second surface antireflection layer 50 are shown. A method for manufacturing the low reflection film 30 will be described.

First, the first surface antireflection layer 40 is produced. At this time, for example, first, a resin film constituting the first side transparent base layer 42 is prepared. Next, a coating liquid for forming a hard coat layer is applied onto the resin film, dried, and irradiated with ultraviolet rays to form a hard coat layer 44 on the first side. Next, a coating liquid for forming a high refractive index layer is applied onto the first surface hard coat layer 44, dried, and irradiated with ultraviolet rays to form a first surface high refractive index layer 46. Next, a coating liquid for forming a low refractive index layer is applied onto the first surface high refractive index layer 46, dried, and irradiated with ultraviolet rays to form the first surface low refractive index layer 45. In this way, the first surface antireflection layer 40 is obtained.

Further, the second surface antireflection layer 50 is produced. At this time, for example, first, a resin film constituting the second surface transparent base layer 52 is prepared. Next, a coating liquid for forming a hard coat layer is applied onto the resin film, dried, and irradiated with ultraviolet rays to form a second surface hard coat layer 54. Next, a coating liquid for forming a high refractive index layer is applied onto the second surface hard coat layer 54, dried, and irradiated with ultraviolet rays to form a second surface high refractive index layer 56. Next, a coating liquid for forming a low refractive index layer is applied onto the second surface high refractive index layer 56, dried, and irradiated with ultraviolet rays to form the second surface low refractive index layer 55. In this way, the second surface antireflection layer 50 is obtained.

Furthermore, a core layer 32 provided with a printed layer 33 is produced. At this time, for example, first, a polyethylene terephthalate film is prepared as the core layer 32. Next, a printed layer 33 is formed on the core layer 32 by, for example, gravure printing.

Then, the first surface antireflection layer 40 and the core layer 32 are bonded to each other via the first transparent adhesive layer 31a, and the core layer 32 and the second surface antireflection layer 50 are bonded together via the second transparent adhesive layer 31b. laminate them by adhering them to each other.

Next, a cutting process is performed to form the outer edge 30a of the low reflection film 30. When producing the low reflection film 30 including the outer edge 30a shown in FIG. Cut out the shape. In this way, the low reflection film 30 including the outer edge 30a can be produced.

When cutting the low-reflection film 30, a cutting method is selected that can form the outer edge 30a that is difficult to see in the vicinity described above. That is, as the cutting process method, a method is selected in which the width W1 of the first outer edge region 30d is smaller than 100 μm. As a cutting processing method, the maximum value of the intensity of reflected light in an environment where light is irradiated from multiple directions within the strip-shaped region 30f is determined such that the maximum value of the intensity of reflected light within the strip-shaped region 30f is A method may be selected so that the intensity of the reflected light is 2.0 times or less as compared to the average value.

An example of a cutting method that can form the outer edge 30a that is difficult to visually recognize in the vicinity is a punching process in which the low-reflection film 30 is cut using a sharp blade and high pressure. Specifically, the punching process can be performed by Thomson punching using a Thomson blade using a digital electric servo press device (manufactured by Amada Press System Co., Ltd., product name "SDE-8013iIII").

As a cutting method that can form the outer edge 30a that is difficult to see in the vicinity, there is laser processing, in which the low-reflection film 30 is burned off with the heat of a laser. Specifically, the laser processing can be performed by cutting the film using a two-dimensional scan of a CO2 laser using a laser cutter device (manufactured by Comnet Co., Ltd., product name "GCC Laser Pro 180").

In particular, as a result of intensive research into the low reflection film 30 that is difficult to see in the vicinity of the outer edge 30a, the inventors of the present invention found that when the thickness of the low reflection film 30 is small, the low reflection film 30 in the vicinity of the outer edge 30a It was discovered that the function of suppressing light reflection by In particular, it has been found that when the thickness of the low reflection film 30 is small, the outer edge 30a formed by cutting tends to have a rough shape in the vicinity thereof. This is thought to be because when the thickness of the low-reflection film 30 is small, the low-reflection film 30 tends to stretch during cutting, making it difficult for the cut surface to become smooth. It is thought that when the vicinity of the outer edge 30a of the low reflection film 30 has a rough shape, light is diffusely reflected in the vicinity of the outer edge 30a, making the vicinity of the outer edge 30a easier to see. Here, according to the cutting process such as the above-mentioned punching process or laser process, even if the film thickness of the low reflection film 30 is small, especially 500 μm or less, further 300 μm or less, and even 250 μm or less, the outer edge In the vicinity of 30a, the function of suppressing light reflection by the low reflection film 30 is less likely to be impaired. In particular, it is possible to prevent the vicinity of the outer edge 30a of the low reflection film 30 from becoming rough. This makes it possible to form an outer edge 30a that is difficult to visually recognize in the vicinity. In particular, according to the above-mentioned cutting process such as punching or laser processing, even if the thickness of the low reflection film 30 is 500 μm or less, further 300 μm or less, and even 250 μm or less, the first outer edge region 30d The outer edge 30a may be formed so that the width W1 is smaller than 100 μm.

In addition, the inventors of the present invention have discovered that the low reflection film 30 of this embodiment, which is made up of a plurality of layers, has a function of suppressing light reflection by the low reflection film 30, compared to a film made of a single material. was found to be easily damaged. In particular, it has been found that the outer edge 30a formed by cutting of the low-reflection film 30 made of a plurality of layers tends to have a rough shape in the vicinity thereof, compared to a film made of a single material. This is considered to be because the low reflection film 30 consisting of a plurality of layers needs to be cut into a plurality of layers by a cutting process, and thus the cut surface is difficult to be smooth. Furthermore, the inventors of the present invention have found that the low reflection film 30 of the present embodiment, which includes adhesive layers such as the first transparent adhesive layer 31a and the second transparent adhesive layer 31b, is more effective than a film without an adhesive layer. It has been found that the function of suppressing light reflection by the low reflection film 30 is likely to be impaired. In particular, in the low-reflection film 30 that includes an adhesive layer such as the first transparent adhesive layer 31a and the second transparent adhesive layer 31b, the outer edge 30a formed by cutting is closer to the outer edge 30a than a film without an adhesive layer. It was found that the shape tends to be rough. This is thought to be because the adhesive layer is formed from a material that is relatively more stretchable than other layers, so the low-reflection film 30 tends to stretch in the adhesive layer when cutting, making it difficult for the cut surface to become smooth. It will be done. Here, according to the above-mentioned cutting process such as punching process or laser process, even when cutting the low reflection film 30 consisting of a plurality of layers, especially the low reflection film 30 having an adhesive layer, the vicinity of the outer edge 30a In this case, the function of suppressing light reflection by the low reflection film 30 is less likely to be impaired. In particular, it is possible to prevent the vicinity of the outer edge 30a of the low reflection film 30 from becoming rough. This makes it possible to form an outer edge 30a that is difficult to visually recognize in the vicinity. In particular, according to the above-mentioned cutting process such as punching or laser processing, even when cutting the low reflection film 30 consisting of a plurality of layers, especially the low reflection film 30 including an adhesive layer, the first outer edge region 30d The outer edge 30a may be formed such that the width W1 of the outer edge 30a is smaller than 100 μm. As a result, while using the low reflection film 30 in which the light reflectance in the transparent region 34 is suppressed to a low level by including the first surface antireflection layer 40 and the second surface antireflection layer 50, the outer edge 30a is difficult to be visually recognized in the vicinity. can be formed. As described above, various expressions can be realized using the low reflection film 30. In particular, it is possible to give the viewer the impression that the characters, patterns, etc. formed in the print area 35 are floating in the air.

Next, a low reflection film 100 with a support portion is produced. At this time, the low reflection film 30 is supported by the support section 70. When producing the low reflection film 100 with a support part shown in FIG. 3B, the lower edge 30b2 of the low reflection film 30 is inserted into the groove part 79 of the support part 70. When producing the low reflection film 100 with a support part shown in FIG. 3C, the upper edge 30b1 of the low reflection film 30 is sandwiched between the first holding part 72d and the second holding part 72e of the support part 70. Thereby, as shown in FIGS. 3B and 3C, a low reflection film 100 with a supporting portion can be manufactured.

As described above, according to this embodiment, the width W1 of the first outer edge region 30d of the low reflection film 30 is smaller than 100 μm. Thereby, the low reflection film 30 becomes difficult to be visually recognized near the outer edge 30a, and various expressions can be realized using the low reflection film 30. In particular, it is possible to give the viewer the impression that the characters, patterns, etc. formed in the print area 35 are floating in the air.

Further, according to the present embodiment, the maximum value of the intensity of reflected light in an environment where light is irradiated from multiple directions within the strip-shaped region 30f is the maximum value of the intensity of reflected light in an environment where light is irradiated from multiple directions within the strip-shaped region 30f. This is 2.0 times or less compared to the average intensity of reflected light in the environment. Thereby, the low reflection film 30 becomes more difficult to be visually recognized near the outer edge 30a.

Further, according to this embodiment, the thickness of the low reflection film 30 is 500 μm or less. Thereby, the transparency of the transparent region 34 can be improved.

Further, two low reflection films 30 of this embodiment are prepared, and the two low reflection films 30 are arranged such that one surface and the other surface of the two low reflection films 30 are parallel to each other, and When the two low-reflection films 30 are arranged such that the distance between one and the other is 30 cm or less, the visible light transmittance of visible light passing through the two low-reflection films 30 is 90% or more. Good too. Note that the visible light transmittance in this case is the visible light transmittance at which light passes through the transparent region 34 of the low reflection film 30.

In other words, the low reflection film 30 of this embodiment may satisfy the following conditions. Two low-reflection films 30 of this embodiment are prepared, one of which will be referred to as a first low-reflection film, and the other will be referred to as a second low-reflection film. Then, the first low-reflection film and the second low-reflection film are arranged so that the surface thereof is parallel to the surface and the distance between the first low-reflection film and the second low-reflection film is 30 cm or less. In this case, the visible light transmittance through which visible light passes through the first low reflection film and the second low reflection film may be 90% or more.

When the visible light transmittance through the two low reflection films 30 arranged as described above is 90% or more, the following effects can be obtained. As described above, it is also conceivable to arrange the plurality of low reflection films 30 so as to be lined up in the thickness direction of the low reflection films 30 using one or more support parts 70 as shown in FIGS. 3B and 3C. . This gives the observer the impression that each of the characters, patterns, etc. formed in the printing areas 35 of the plurality of low-reflection films 30 are floating in the air at different positions in the thickness direction of the low-reflection films 30. be able to. This makes it possible to realize a three-dimensional representation that changes in appearance depending on the viewing direction of the observer. Here, by having the above-mentioned visible light transmittance of 90% or more, the two low-reflection films 30 are arranged so that one surface and the other surface of the two low-reflection films 30 are parallel to each other, and the two low-reflection films 30 are When the distance between one low-reflection film 30 and the other is 30 cm or less, an observer can fully see the tips of the two low-reflection films 30 through the two low-reflection films 30. You will be able to see clearly. This allows the observer to visually recognize each of the characters, patterns, etc. formed in the printing areas 35 of the two low-reflection films 30, and at the same time allows the viewer to visually recognize the designs, etc., placed on the front of the two low-reflection films 30. It can be seen clearly enough. Therefore, more diverse three-dimensional expressions can be realized.

In addition, three or more low reflection films 30 of this embodiment are prepared, and all the surfaces of the three or more low reflection films 30 are parallel, and the three or more low reflection films 30 are When any two films selected from among the low reflection films 30 are arranged so that the distance between them is 30 cm or less, the visible light transmittance at which visible light passes through all three or more low reflection films 30 is: It may be 85% or more. In this case, the number of low reflection films 30 to be prepared may be three, four, or five. In this case, while allowing the observer to visually recognize each of the characters, patterns, etc. formed in the printing area 35 of the three or more low-reflection films 30, the characters and patterns placed ahead of the three or more low-reflection films 30 may be made visible to the viewer. The designed design etc. can be seen clearly enough.

In addition, as mentioned above, the method of measuring the visible light transmittance that passes through a plurality of, for example two, low reflection films 30 is, for example, as follows. The measurement of visible light transmittance is performed in accordance with JISR3106:2019. First, a sample with a size of 30 mm x 30 mm is cut out from the low reflection film 30. Prepare two of these. In addition, a resin frame with outer dimensions of 30 mm x 30 mm, inner diameter of 25 mm x 25 mm, and thickness of 1 mm is prepared. The resin frame is square, and has a shape corresponding to a 25 mm x 25 mm square area in the center of a 1 mm thick plate-shaped resin member. Next, two samples are placed on both sides of the resin frame in the thickness direction. The setting method is not particularly limited as long as the surface of the sample does not become distorted. Then, light is irradiated onto the surface of the sample (one of the surfaces of the sample set in the resin frame) at an incident angle of 5°. At this time, the surface of the sample is irradiated with light containing wavelengths from 380 nm to 780 nm. Then, using a spectrophotometer (manufactured by JASCO Corporation, V-7100), the transmission spectrum of the light transmitted at an angle of 5° was obtained for every 10 nm from wavelength 380 nm to 780 nm, and the obtained spectral data Based on this, calculate the visible light transmittance. Thereby, visible light reflectance can be measured by arranging two samples such that their surfaces are parallel to each other and the distance between one and the other is 1 mm. When measuring visible light transmittance by arranging three low-reflection films 30, the measurement is performed as follows. First, a frame made of the same resin as the resin frame described above is fixed to one of the two samples set on both sides of the resin frame in the thickness direction as described above. Next, a third sample is set on the opposite side of the fixed resin frame to the side fixed to the sample. Then, as in the case of measuring visible light transmittance by placing two low-reflection films 30, light is applied to the surface of the sample (either side of the sample set in the resin frame). The visible light transmittance is calculated based on the acquired spectrum data.

Modifications Next, modifications of the low reflection film 30 and the manner in which the low reflection film 30 is used will be described.

(First modification)
In the embodiment described above, an example has been described in which the first outer edge region 30d of the low reflection film 30 is in contact with the outer edge 30a. However, the form of the low reflection film 30 is not limited to this. FIG. 4A is an enlarged plan view showing a part of the low reflection film 30 near the outer edge 30a according to the first modification.

In the first modification, the first outer edge region 30d is separated from the outer edge 30a. The distance from the outer edge 30a of the first outer edge region 30d is 100 μm or less. In the low-reflection film 30 shown in FIG. 4B, the low-reflection film 30 has specularly reflected reflected light that is formed along the outer edge 30a when the low-reflection film 30 is irradiated with light perpendicular to the surface of the low-reflection film 30. It has a continuous region where the intensity of the reflected light is 0.8 times or less as compared to the intensity of the reflected light specularly reflected from the central region 30e of the low reflection film. The area is in contact with the outer edge 30a. Since the region is formed between the first outer edge region 30d and the outer edge 30a, the first outer edge region 30d is separated from the outer edge 30a.

Here, when the low-reflection film 30 is irradiated with light perpendicular to the surface of the low-reflection film 30, the intensity of specularly reflected light that is formed along the outer edge 30a changes from the central region 30e of the low-reflection film 30 to the normal direction. A continuous area where the intensity is 0.8 times or less as compared to the intensity of the reflected light is defined as the second outer edge area 30g. In particular, in the first modification, an area that satisfies the following conditions is defined as the second outer edge area 30g. The low reflection film 30 is irradiated with light perpendicular to the first surface 301 of the low reflection film 30, from the first surface 301 side of the low reflection film 30 and in the direction perpendicular to the first surface 301 of the low reflection film 30. Observe the low reflection film 30 from below. In this case, the intensity of the reflected light, which is visible light specularly reflected on the first surface 301 side, is the intensity of the reflected light, which is visible light specularly reflected on the first surface 301 side of the central region 30e of the low reflection film 30. A continuous area where the area is 0.8 times or less as compared to the area is defined as the second outer edge area 30g. At this time, in the first modification, the sum of the width W2 of the second outer edge region 30g and the width W1 of the first outer edge region 30d becomes smaller than 100 μm. Note that when the sum of the width W2 of the second outer edge region 30g and the width W1 of the first outer edge region 30d is smaller than 100 μm, when at least one of the width W1 and the width W2 is 0, that is, low reflection. A case may also be included in which at least one of the first outer edge region 30d and the second outer edge region 30g is not formed in the film 30.

Further, the intensity of the reflected light formed between the first outer edge region 30d and the second outer edge region 30g and specularly reflected is 0.0% compared to the intensity of the reflected light specularly reflected from the central region 30e of the low reflection film 30. The area where the area is greater than 8 times and less than 1.2 times is defined as the first connection area 30m. In particular, in the first modification, an area that satisfies the following conditions is defined as the first connection area 30m. The low reflection film 30 is irradiated with light perpendicular to the first surface 301 of the low reflection film 30, from the first surface 301 side of the low reflection film 30 and in the direction perpendicular to the first surface 301 of the low reflection film 30. Observe the low reflection film 30 from below. In this case, the intensity of the reflected light, which is visible light specularly reflected on the first surface 301 side, is the intensity of the reflected light, which is visible light specularly reflected on the first surface 301 side of the central region 30e of the low reflection film 30. A continuous area that is greater than 0.8 times and less than 1.2 times as large as the first connection area 30m is defined as the first connection area 30m. At this time, the width of the first connection region 30m (width W6 shown in FIG. 4A) is 5 μm or less. Note that the case where the width W6 of the first connection region 30m is 5 μm or less includes the case where the width W6 is 0, that is, the case where the first connection region 30m is not formed on the low reflection film 30.

In the first modification, when the low reflection film 30 is irradiated with light perpendicular to the surface of the low reflection film 30, the low reflection film 30 is formed on the side opposite to the outer edge 30a side of the first outer edge region 30d. It has a continuous region extending in the direction in which the outer edge 30a extends, where the intensity of the specularly reflected light is 0.8 times or less compared to the intensity of the specularly reflected light from the central region 30e of the low reflection film 30.

Here, when the low-reflection film 30 is irradiated with light perpendicular to the surface of the low-reflection film 30, a positive light formed on the side opposite to the outer edge 30a side of the first outer edge region 30d and extending in the direction in which the outer edge 30a extends. A continuous region where the intensity of the reflected light is 0.8 times or less as compared to the intensity of the reflected light specularly reflected from the central region 30e of the low reflection film 30 is defined as the third outer edge region 30h. In particular, in the first modification, an area that satisfies the following conditions is defined as the third outer edge area 30h. The low reflection film 30 is irradiated with light perpendicular to the first surface 301 of the low reflection film 30, from the first surface 301 side of the low reflection film 30 and in the direction perpendicular to the first surface 301 of the low reflection film 30. Observe the low reflection film 30 from below. In this case, the intensity of the reflected light, which is visible light specularly reflected on the first surface 301 side, is the intensity of the reflected light, which is visible light specularly reflected on the first surface 301 side of the central region 30e of the low reflection film 30. A continuous area where the area is 0.8 times or less as compared to the above is defined as the third outer edge area 30h. The distance W5 from the outer edge 30a of the third outer edge region 30h is determined to be, for example, 200 μm or less. Note that regarding a region, "the distance from the outer edge 30a is 200 μm or less" means that the distance from the outer edge 30a of the part closest to the outer edge 30a of the region is 200 μm or less. At this time, in the first modification, the sum of the width W3 of the third outer edge region 30h and the width W1 of the first outer edge region 30d becomes smaller than 100 μm. Note that when the sum of the width W3 of the third outer edge region 30h and the width W1 of the first outer edge region 30d is smaller than 100 μm, when at least one of the width W1 and the width W3 is 0, that is, low reflection A case may also be included in which at least one of the first outer edge region 30d and the third outer edge region 30h is not formed in the film 30.

Further, the intensity of the reflected light that is formed between the first outer edge region 30d and the third outer edge region 30h and that is specularly reflected is 0.0. An area that is greater than 8 times and less than 1.2 times is defined as the second connection area 30n. In particular, in the first modification, an area that satisfies the following conditions is defined as the second connection area 30n. The low reflection film 30 is irradiated with light perpendicular to the first surface 301 of the low reflection film 30, from the first surface 301 side of the low reflection film 30 and in the direction perpendicular to the first surface 301 of the low reflection film 30. Observe the low reflection film 30 from below. In this case, the intensity of the reflected light, which is visible light specularly reflected on the first surface 301 side, is the intensity of the reflected light, which is visible light specularly reflected on the first surface 301 side of the central region 30e of the low reflection film 30. A continuous region that is greater than 0.8 times and less than 1.2 times as large as the second connection region 30n is defined as the second connection region 30n. At this time, the width of the second connection region 30n (width W7 shown in FIG. 4A) is 5 μm or less. Note that the case where the width W7 of the second connection region 30n is 5 μm or less includes the case where the width W7 is 0, that is, the case where the second connection region 30n is not formed on the low reflection film 30.

Regarding the second outer edge region 30g and the third outer edge region 30h, "the intensity of the specularly reflected light is 0.8 times or less compared to the intensity of the specularly reflected light from the central region 30e of the low reflection film 30". In the "continuous region", the intensity of reflected light specularly reflected continuously in the direction perpendicular to the direction in which the outer edge 30a extends is 0.0% compared to the intensity of the reflected light specularly reflected from the central region 30e of the low-reflection film 30. This is an area where it is 8 times or less. Regarding the first connection area 30m and the second connection area 30n, "the intensity of the reflected light specularly reflected is greater than 0.8 times the intensity of the reflected light specularly reflected from the central area 30e of the low reflection film 30". .2 times or less'' means that the intensity of the reflected light that is specularly reflected continuously in the direction orthogonal to the direction in which the outer edge 30a extends is the same as that of the reflected light that was specularly reflected from the central area 30e of the low reflection film 30. This is a region where the intensity is greater than 0.8 times and 1.2 times or less.

Normally, the second outer edge region 30g and the third outer edge region 30h, which are continuous regions where the intensity of the specularly reflected light is 0.8 times or less compared to the intensity of the specularly reflected light from the central region 30e, are low. When the first surface 301 of the low reflection film 30 is observed from the front while the reflection film 30 is irradiated with light perpendicular to the surface of the low reflection film 30, it appears black.

Complete elucidation of the reason why the second outer edge region 30g and the third outer edge region 30h occur will require further research, but the following reasons can be considered, for example. FIG. 4B is a diagram showing an example of a cross section near the outer edge 30a of the low reflection film 30 having the second outer edge region 30g and the third outer edge region 30h. In the example shown in FIG. 4B, the low reflection film 30 has a shape that swells in the thickness direction of the low reflection film 30 near the outer edge 30a. Such a shape bulging in the thickness direction may be formed when the outer edge 30a is formed on the low reflection film 30 by cutting the low reflection film 30. In order to have this shape, the low reflection film 30 has a first region 30i that forms a relatively small angle with respect to the first surface 301 in the vicinity of the outer edge 30a, and a first region 30i that forms a relatively small angle with the first surface 301. It has a large second region 30j and a large third region 30k. The second region 30j is located on the outer edge 30a side of the first region 30i. The third region 30k is located on the opposite side of the outer edge 30a of the first region 30i. In the first region 30i, light perpendicular to the first surface 301, which is the surface of the low-reflection film 30, is likely to be reflected in a direction close to the direction perpendicular to the first surface 301. It is thought that the intensity of the specularly reflected light increases. In the second region 30j and the third region 30k, since light perpendicular to the first surface 301 is likely to be reflected in a direction close to the direction perpendicular to the first surface 301, the specular reflection measured by the above-mentioned measurement method It is thought that the intensity of the reflected light becomes smaller. In such a case, the first region 30i forms the first outer edge region 30d, the second region 30j forms the second outer edge region 30g, and the third region 30k forms the third outer edge region 30h. It is considered that a second outer edge region 30g and a third outer edge region 30h are generated.

Areas such as the second outer edge area 30g and the third outer edge area 30h that appear black when irradiated with light perpendicular to the first surface 301 have a large width near the outer edge 30a of the low reflection film 30. When it appears, the outer edge 30a of the low-reflection film 30 stands out, making the presence of the low-reflection film 30 noticeable. Further, the inventor of the present invention found that when observing the low reflection film 30 having such a second outer edge region 30g and a third outer edge region 30h in an environment where light is irradiated from multiple directions, the second outer edge region 30g It has also been found that the third outer edge region 30h appears white. Therefore, if the second outer edge area 30g and the third outer edge area 30h appear with a large width, even when observing the low reflection film 30 in an environment where light is irradiated from multiple directions, the second outer edge area 30g and the third outer edge region 30h are visually recognized as white parts, thereby making the outer edge 30a of the low reflection film 30 noticeable. In particular, the width W6 of the first connection area 30m or the width W7 of the second connection area 30n is 5 μm or less, and the distance between the first outer edge area 30d and the second outer edge area 30g or the first outer edge area 30d and the third outer edge area 30h, the outer edge 30a of the low reflection film 30 becomes more noticeable.

According to the low reflection film 30 of the first modification, in order to suppress the sum of the width W2 of the second outer edge region 30g and the width W1 of the first outer edge region 30d to less than 100 μm, the second outer edge region 30g and the first outer edge region 30d, the outer edge 30a of the low-reflection film 30 and the presence of the low-reflection film 30 are prevented from being noticeable. In addition, in order to suppress the sum of the width W3 of the third outer edge region 30h and the width W1 of the first outer edge region 30d to less than 100 μm, the outer edge of the low reflection film 30 is provided for the third outer edge region 30h and the first outer edge region 30d. 30a and the low reflection film 30 are prevented from being noticeable. In particular, even if the width W6 of the first connection area 30m or the width W7 of the second connection area 30n is 5 μm or less, the outer edge 30a of the low reflection film 30 and the presence of the low reflection film 30 itself are prevented from being noticeable. Ru. Therefore, without making the presence of the low-reflection film 30 noticeable, it is possible to give the viewer the impression that the characters, patterns, etc. formed in the print area 35 are floating in the air. This makes it difficult for the low reflection film 30 to be visually recognized near the outer edge 30a, making it possible to realize a variety of expressions using the low reflection film 30.

As a method for measuring the width W2 of the second outer edge region 30g, the width W3 of the third outer edge region 30h, the width W6 of the first connection region 30m, and the width W7 of the second connection region 30n, the method described in "(1) Adopt the method of measuring the width W2 of the second outer edge area 30g, the width W3 of the third outer edge area 30h, the width W6 of the first connection area 30m, and the width W7 of the second connection area 30n in ``Measurement test of the width of the second outer edge area 1''. can.

In the first modification, the low reflection film 30 is irradiated with light perpendicular to the second surface 302 of the low reflection film 30, and the first outer edge region 30d, the first outer edge region 30d and the When considering areas that satisfy the conditions of the second outer edge area 30g, the third outer edge area 30h, the first connection area 30m, and the second connection area 30n, the following relationship may be established. The total width of the region satisfying the conditions of the second outer edge region 30g and the width of the region satisfying the conditions of the first outer edge region 30d may be smaller than 100 μm. Further, the total width of the region satisfying the conditions of the third outer edge region 30h and the width of the region satisfying the conditions of the first outer edge region 30d may be smaller than 100 μm. Further, the width of the region satisfying the conditions of the first connection region 30m may be 5 μm or less. Further, the width of the region satisfying the conditions of the second connection region 30n may be 5 μm or less.

(Second modification)
In the embodiment described above, an example in which the low reflection film 30 includes the printing area 35 has been described. However, the form of the low reflection film 30 is not limited to this. FIG. 4C is a perspective view showing a low reflection film 30 according to a second modification and a low reflection film 60 with a display object including the low reflection film 30.

The low-reflection film 30 of the second modification does not include the printing area 35, as shown in FIG. 4C. The low reflection film 30 of the second modified example is the same as the low reflection film 30 of the above-described embodiment, except that it does not include the print area 35. The description given regarding the low reflection film 30 including the print area 35 described above in the above-described embodiment can be applied to the description of the low reflection film 30 without the print area 35 of the second modified example, as long as there is no contradiction.

The low reflection film with display object 60 shown in FIG. 4C includes the low reflection film 30 and the display object 61 fixed on the low reflection film 30. In the example shown in FIG. 4C, the display object 61 is fixed on the first surface 301 of the low reflection film 30. The display object 61 is not particularly limited as long as it can be fixed on the low reflection film 30. The display object 61 is, for example, a sticker pasted on the low reflection film 30. When the low-reflection film 60 with a display object is used as an advertisement for promoting a product, the actual product to be advertised may be fixed on the low-reflection film 30 as the display object 61. In this case, the actual product fixed on the low reflection film 30 as the display object 61 is, for example, confectionery such as gum or candy. The method of fixing the display object 61 on the low reflection film 30 is not particularly limited. For example, the display object 61 is fixed on the low-reflection film 30 by being adhered onto the low-reflection film 30 via an adhesive layer (not shown).

The display object-attached low reflection film 60 can be supported by a support section 70 similar to the support section 70 described above in the embodiment, and by a method similar to the method described above in the embodiment. In the example shown in FIG. 4C, the display object-attached low-reflection film 60 is supported by a support section 70 similar to the support section 70 shown in FIG. 3C in a manner similar to that shown in FIG. 3C.

The low reflection film 30 and the low reflection film with display object 60 of the second modification also make it difficult for the low reflection film 30 to be visually recognized in the vicinity of the outer edge 30a, making it possible to realize various expressions. In particular, it is possible to give the viewer the impression that the display object 61 fixed on the low-reflection film 30 is floating in the air.

In addition, two low-reflection films 60 with display objects of the second modification are prepared, and the two low-reflection films 60 with display objects are used as one of the low-reflection films 60 with display objects. 30 and the other surface of the low-reflection film 30 are parallel, and when the two low-reflection films 60 with display objects are arranged so that the distance between one and the other is 30 cm or less, visible light The transmittance of visible light passing through a portion of the two display object-attached low-reflection films 60 that does not include the display object 61 may be 90% or more. Note that the visible light transmittance in this case is the visible light transmittance at which light passes through a portion of the transparent region 34 of the low reflection film 30 of the display object-attached low reflection film 60 where the display object 61 does not overlap.

When the visible light transmittance through the part of the two low-reflection films 60 with display objects arranged as described above that does not include the display object 61 is 90% or more, the following effects can be obtained. The two low-reflection films 60 with display objects are arranged such that the surface of one low-reflection film 30 and the surface of the other low-reflection film 30 of the two low-reflection films 60 with display objects are parallel to each other, and the two low-reflection films 60 have display objects. When the distance between one low-reflection film 60 with an object and the other is 30 cm or less, an observer can cross the part of the two low-reflection films 60 with an object that does not include the display object 61. , it becomes possible to see clearly beyond the two low-reflection films 60 with display objects. This allows the observer to visually recognize each of the display objects 61 of the two low-reflection films 60 with display objects, and at the same time, clearly shows the design etc. placed ahead of the two low-reflection films 60 with display objects. can be visually recognized. Therefore, more diverse three-dimensional expressions can be realized.

Note that three or more low-reflection films 60 with display objects of this embodiment are prepared, and the three or more low-reflection films 60 with display objects are used as the low-reflection films 60 with display objects. When all the surfaces of the film 30 are parallel and the distance between any two films selected from three or more low-reflection films 60 with display objects is 30 cm or less, three visible light The transmittance of visible light that passes through all of the above low-reflection film with display object 60 may be 85% or more. In this case, the number of low reflection films 60 with display objects to be prepared may be three, four, or five. In this case, the observer is made to visually recognize each of the display objects 61 of the three or more display object-attached low-reflection films 60, and at the same time, the display object 61 placed in front of the three or more display object-attached low-reflection films 60 is Designs, etc. can be clearly recognized.

As a method for measuring the visible light transmittance passing through a plurality of low reflection films 60 with display objects, for example, two sheets, unless there is a contradiction, the visible light transmittance passing through a plurality of low reflection films 30 described above can be measured. This method can be adopted.

(Third modification)
The low reflection film 30 described above in the above embodiments and modifications may be used for the book cover 81. FIG. 5 is a perspective view showing a book cover 81 using the low reflection film 30 according to the third modification together with a book B covered by the book cover 81.

In the example shown in FIG. 5, the book cover 81 includes the low reflection film 30 described above in the embodiments and modifications described above. In particular, the book cover 81 is made of the low reflection film 30. The outer edge of the book cover 81 is formed by the outer edge 30a of the low reflection film 30. In the example shown in FIG. 5, the low reflection film 30 is folded to correspond to the shape of the book B, and covers the front cover B1 and the back cover B2 of the book B. In the example shown in FIG. 5, the low-reflection film 30 includes a printing area 35 on which the letter "A" is printed, located in a portion of the low-reflection film 30 that covers the cover B1. Further, on the cover B1 of the book B, the characters "bcd" are printed. In a state where the book cover 81 covers the book B, the letters "A" and the letters "bcd" are visible at the same time. In this way, according to the book cover 81 including the low-reflection film 30, the characters, patterns, etc. provided on the book B are overlapped with the characters, patterns, etc. formed in the print area 35 of the low-reflection film 30. By displaying, various expressions can be realized.

Further, according to the book cover 81 including the low reflection film 30, the width W1 of the first outer edge region 30d, which is assumed to have a relatively rough shape, is smaller than 100 μm, so that the outer edge 30a of the low reflection film 30 It can prevent those who touch it from feeling a prickly sensation. As a result, even when the outer edge of the book cover 81 is formed by the outer edge 30a of the low reflection film 30, it is possible to suppress a person who touches the outer edge of the book cover 81 from feeling a prickly sensation.

(Fourth modification)
The low reflection film 30 described above in the embodiments and modifications described above may be used for the book 82. FIG. 6 is a perspective view showing a book 82 using a low reflection film 30 according to a fourth modification.

In the example shown in FIG. 6, the book 82 includes the low reflection film 30 described above in the embodiments and modifications described above. In the example shown in FIG. 6, the book 82 is a so-called pop-up picture book, and the portion that pops out when the pages of the book 82 are turned is made of the low-reflection film 30. The low reflection film 30 includes a printing area 35 on which the letter "A" is printed. Therefore, when the pages of the book 82 are turned over, the letter "A" appears to pop out. As shown in FIG. 6, by forming the part of the book 82, which is a picture book that pops out, with a low reflection film 30 that pops out when the page is turned, the characters, pictures, etc. formed in the print area 35 appear to be floating in the air. It is possible to give a good impression to the person reading the book 82. In the example shown in FIG. 6, the outer edge of the portion that pops out when the page is turned is formed by the outer edge 30a of the low reflection film 30. In this case, a person who touches the outer edge of the part that pops out when the pages of the book 82 are turned over can be prevented from feeling a prickly sensation.

Although not shown, the low reflection film 30 may be used as a normal page of a normal book 82 that is not a pop-up picture book. Even in this case, various expressions can be realized using the low reflection film 30. When the low reflection film 30 is used as a normal page, the outer edge of the normal page may be formed by the outer edge 30a of the low reflection film 30. In this case, it is possible to prevent a person who touches the outer edge of a normal page from feeling a prickly sensation.

Next, specific examples of the above embodiment will be described.

(Example 1)
First, a low reflection film 30 shown in FIG. 2I was produced. At this time, first, the first surface antireflection layer 40 was produced. When producing the first surface antireflection layer 40, first, a 60 μm thick triacetyl cellulose film (refractive index 1.49) was prepared as the first surface transparent base layer 42. Next, a coating solution for forming a hard coat layer with the following formulation was applied onto the triacetyl cellulose film, dried and irradiated with ultraviolet rays to form a hard coat layer on the first side with a thickness of 7.3 μm, a refractive index of 1.54, and a pencil hardness of 2H. 44 was formed. Next, a coating liquid for forming a high refractive index layer having the following formulation is applied onto the first surface hard coat layer 44, dried and irradiated with ultraviolet rays to form a first surface high refractive index layer 46 with a thickness of 150 nm and a refractive index of 1.63. was formed. Next, on this first surface high refractive index layer 46, a coating liquid for forming a low refractive index layer having the following formulation is applied, dried and irradiated with ultraviolet rays to form a first surface low refractive index layer having a thickness of 100 nm and a refractive index of 1.30. 45 was formed to obtain a first surface antireflection layer 40.

<Preparation of coating liquid for forming hard coat layer>
Photopolymerization initiator (manufactured by BASF, Irgacure 127, 2-hydroxy-1-{4-[4-(2-hydroxy-2-methylpropionyl)benzyl]phenyl}-2-methylpropan-1-one) .6 parts by mass and 58.3 parts by mass of a diluting solvent (methyl isobutyl ketone/cyclohexanone = 8/2) were added, and the mixture was stirred until there was no undissolved residue. Add 20 parts by mass of a photocurable resin (manufactured by Arakawa Chemical Co., Ltd., Beam Set 577) and 20 parts by mass of a high refractive index resin (manufactured by DIC Corporation, Polylite RX-4800) and stir until there is no undissolved residue. did. Finally, 0.1 part by mass of a leveling agent (Seikabeam 10-28 (MB), manufactured by Dainichiseika Chemical Industry Co., Ltd.) was added and stirred to prepare a coating solution for forming a hard coat layer.

<Preparation of coating liquid for forming high refractive index layer>
0.1 parts by mass of a photopolymerization initiator (manufactured by BASF, Irgacure 127) and 92.6 parts by mass of a diluting solvent (methyl isobutyl ketone/cyclohexanone/methyl ethyl ketone = 4/2/4) were added, and the mixture was stirred until there was no undissolved residue. . 1.25 parts by mass of a photocurable resin (manufactured by Arakawa Chemical Co., Ltd., Beam Set 577) was added thereto, and the mixture was stirred until there was no undissolved residue. Furthermore, 6 parts by mass of zirconium oxide (manufactured by Sumitomo Osaka Cement Co., Ltd., MZ-230X, solid content 32.5% by mass, average primary particle size 15 to 50 nm) and a leveling agent (manufactured by Dainichiseika Kagyo Co., Ltd., Seikabeam 10-28 ( MB)) 0.05 parts by mass were added and stirred to prepare a coating solution for forming a high refractive index layer.

<Preparation of Coating Solution for Forming Low Refractive Index Layer>
0.2 parts by mass of photopolymerization initiator (manufactured by BASF, Irgacure 127) and 91.1 parts by mass of dilution solvent (MIBK/AN=7/3) were added and stirred until there was no residue left. 1.0 parts by mass of photocurable resin (manufactured by Nippon Kayaku Co., Ltd., KAYARAD-PET-30), 7.6 parts by mass of hollow silica particles (solid content 20% by mass, average primary particle diameter 60 nm), and 0.1 parts by mass of leveling agent (manufactured by Dainichiseika Chemicals Co., Ltd., Seikabeam 10-28 (MB)) were added and stirred to prepare a coating liquid for forming a low refractive index layer.

Next, the second surface antireflection layer 50 was produced. When producing the second surface antireflection layer 50, first, a 60 μm thick triacetylcellulose film (refractive index 1.49) was prepared as the second surface transparent base layer 52. Next, a coating solution for forming a hard coat layer having the above formulation was applied onto the triacetyl cellulose film, dried and irradiated with ultraviolet rays to form a hard coat layer on the second side with a thickness of 7.3 μm, a refractive index of 1.54, and a pencil hardness of 2H. 54 was formed. Next, on this second surface hard coat layer 54, a coating liquid for forming a high refractive index layer having the above prescription is applied, dried and irradiated with ultraviolet rays to form a second surface high refractive index layer 56 having a thickness of 150 nm and a refractive index of 1.63. was formed. Next, on the second surface high refractive index layer 56, a coating liquid for forming a low refractive index layer having the above formulation is applied, dried and irradiated with ultraviolet rays to form a second surface low refractive index layer having a thickness of 100 nm and a refractive index of 1.30. 55 was formed to obtain a second antireflection layer 50.

Next, the first surface antireflection layer 40 and the second surface antireflection layer 50 are coated with a transparent adhesive layer (manufactured by Panac Corporation, Panaclean Series PD-S1, thickness 25 μm) and a polyethylene terephthalate film with a thickness of 50 μm (Toray Industries, Inc.). Lumirror 50U483 (manufactured by Panac Corporation) and a transparent adhesive layer (manufactured by Panac Co., Ltd., Panaclean Series PD-S1, thickness 25 μm) were used to adhere to each other.

Next, a printed layer 33 was formed on the side of the first-side anti-reflection layer 40 opposite the side bonded to the polyethylene terephthalate film, and on the side of the second-side anti-reflection layer 50 opposite the side bonded to the polyethylene terephthalate film. The printed area 35 formed by the printed layer 33 was a "Gothic-type A with a line width of 1 cm" on the first side 301 of the low-reflection film 30, measuring a maximum of 20 cm in the vertical direction and a maximum of 20 cm in the horizontal direction.

Next, a cutting process was performed to form an outer edge 30a of the low reflection film 30. At this time, the low reflection film 30 was cut into a rectangular shape. Punching was used as the cutting process. Specifically, the punching process was performed using a digital electric servo press device (manufactured by Amada Press System Co., Ltd., product name "SDE-8013iIII") by Thomson punching process using a Thomson blade. The length of the upper edge 30b1 and lower edge 30b2 of the low reflection film 30 was 600 mm. The length of the side edge 30c of the low reflection film 30 was 400 mm.

The layer structure of the obtained low reflection film 30 is as follows.
Printing / Low refractive index / High refractive index / Hard coat / TAC / Viscous / PET / Viscous / TAC / Hard coat / High refractive index / Low refractive index / Printing In the above, "low refractive index" refers to the first surface low refractive index layer or the second surface low refractive index layer. It means a surface low refractive index layer (the same applies below). Moreover, "high refractive index" means a first surface high refractive index layer or a second surface high refractive index layer (the same applies hereinafter). Moreover, "hard coat" means a first surface hard coat layer or a second surface hard coat layer (the same applies hereinafter). Moreover, "TAC" means triacetyl cellulose film (the same applies hereinafter). Moreover, "sticky" means a transparent adhesive layer. "PET" stands for polyethylene terephthalate film. Furthermore, "printing" indicates a printed layer. The film thickness of the low reflection film 30 according to Example 1 was 245.1 μm.

Next, using the produced low reflection film 30, a low reflection film 100 with a support portion shown in FIG. 3C was produced. At this time, the low reflection film 30 was supported by the support part 70 to produce a low reflection film 100 with a support part.

(1) Test for measuring the width of the first outer edge region Next, a test for measuring the width W1 of the first outer edge region 30d was conducted on the low reflection film 30.

A test for measuring the width W1 of the first outer edge region 30d was conducted by the following method. The ratio of the brightness of the area near the outer edge 30a of the low reflection film 30 to the brightness of the central area 30e was calculated by the following method. First, the low reflection film 30 was placed. Then, while irradiating light from the first surface 301 side of the low reflection film 30, a digital photograph of the area near the outer edge 30a and the central area 30e of the low reflection film 30 was taken from the first surface 301 side. Irradiation of light to the first surface 301 side of the low reflection film 30 was performed so that the irradiated light was perpendicular to the first surface 301 of the low reflection film 30. The pixel size of the resulting photograph was 1260 x 960 pixels. When taking digital photographs, images of the area near the outer edge 30a and the central area 30e magnified 200 times were taken using an optical microscope (manufactured by AnMo Electronics Corporation, product name "Dino-Lite Premier"). Light was irradiated onto the first surface 301 side of the low reflection film 30 using an LED, which is a light source included in the optical microscope. Thereafter, the taken digital photographs were analyzed to obtain brightness values in the area near the outer edge 30a and the central area 30e of the low-reflection film 30. The brightness value in the area near the outer edge 30a was acquired by determining a straight line for acquiring the brightness value that extends in a direction perpendicular to the direction in which the outer edge 30a extends, and acquiring the brightness value along the straight line. Brightness values were acquired by analyzing digital photographs using image processing software ImageJ. Brightness values were acquired for each pixel included in the digital photograph. As the brightness value, the relative brightness of 255 gradations displayed by ImageJ was used. As the ratio of the brightness value of the area near the outer edge 30a of the low reflection film 30 to the brightness value of the central area 30e, the ratio of the brightness of the area near the outer edge 30a of the low reflection film 30 to the brightness of the center area 30e is Obtained. Then, the first outer edge area 30d was identified as an area where the ratio of the acquired luminance values was 1.2 or more. The dimensions on the photograph taken using the optical microscope, such as the width W1 of the first outer edge region 30d, were determined by the following method. It was calculated that 123 pixels correspond to 200 μm by comparing the 200 μm scale displayed on the acquired photo with the pixel size of the photo by the software used when taking the photo using an optical microscope. Then, based on the correspondence that 123 pixels correspond to 200 μm, dimensions on the photograph taken using an optical microscope, such as the width W1 of the first outer edge region 30d, were specified. In specifying the width W1 of the first outer edge region 30d, first, a region in which pixels having a ratio of luminance value to the luminance value of the central region 30e of 1.2 or more are lined up consecutively is identified. Next, the number of pixels lined up in the area was counted. Then, the width of the region was determined from the number of counted pixels arranged in a row, based on the correspondence relationship that 123 pixels corresponds to 200 μm. The width of the area was regarded as the width of a continuous area where the intensity of the specularly reflected light was 1.2 times or more compared to the intensity of the specularly reflected light from the central area 30e of the low reflection film 30. .

In addition, the width W2 of the second outer edge region 30g and the width W3 of the third outer edge region 30h were also measured. Specifically, the brightness value of the central region 30e of the brightness value is based on the ratio of the brightness value of the region near the outer edge 30a of the low reflection film 30 to the brightness value of the central region 30e, which is obtained as described above. We identified an area where pixels with a ratio of 0.8 or less to 0.8 are consecutively arranged. Next, the number of pixels lined up in the area was counted. Then, the width of the region was determined from the number of counted pixels arranged in a row, based on the correspondence relationship that 123 pixels corresponds to 200 μm. The width of the area was regarded as the width of a continuous area where the intensity of the specularly reflected light was 0.8 times or less compared to the intensity of the specularly reflected light from the central area 30e of the low reflection film 30. . Based on the width of the continuous region identified in this way, where the intensity of the specularly reflected light is 0.8 times or less compared to the intensity of the specularly reflected light from the central region 30e of the low reflection film 30, The width W2 of the second outer edge region 30g and the width W3 of the third outer edge region 30h were measured.

Additionally, the width W6 of the first connection region 30m and the width W7 of the second connection region 30n were measured. Specifically, the brightness value of the central region 30e of the brightness value is based on the ratio of the brightness value of the region near the outer edge 30a of the low reflection film 30 to the brightness value of the central region 30e, which is obtained as described above. An area where pixels having a ratio of 0.8 to 1.2 are consecutively arranged was identified. Next, the number of pixels lined up in the area was counted. Then, the width of the region was determined from the number of counted pixels arranged in a row, based on the correspondence relationship that 123 pixels corresponds to 200 μm. Then, the width of the area is set to a continuous area in which the intensity of the specularly reflected light is greater than 0.8 times and 1.2 times or less as compared to the intensity of the specularly reflected light from the central area 30e of the low reflection film 30. It was considered as the width of the area. Continuous areas identified in this manner where the intensity of the specularly reflected light is greater than 0.8 times and 1.2 times or less as compared to the intensity of the specularly reflected light from the central region 30e of the low reflection film 30. Based on the width, the width W6 of the first connection area 30m and the width W7 of the second connection area 30n were measured.

The measurement results of the width W1 of the first outer edge region 30d, the width W2 of the second outer edge region 30g, and the width W3 of the third outer edge region 30h are measured values measured at five or more different positions near the outer edge 30a. The average value was taken. As a result of the measurement test of the width W1 of the first outer edge region 30d, it was confirmed that in the low reflection film 30 of Example 1, the width W1 of the first outer edge region 30d was smaller than 100 μm. Further, in the low reflection film 30 of Example 1, the sum of the width W2 of the second outer edge region 30g and the width W1 of the first outer edge region 30d is smaller than 100 μm, and the width W3 of the third outer edge region 30h and the width W1 of the first outer edge region It was confirmed that the total of 30d and width W1 was smaller than 100 μm. Furthermore, in the low reflection film 30 of Example 1, it was confirmed that the width W6 of the first connection region 30m was 5 μm or less, and the width W7 of the second connection region 30n was 5 μm or less.

(2) Sensory evaluation test of visibility of outer edge Next, a sensory evaluation test of visibility of outer edge 30a was conducted on the low-reflection film 30.

In a sensory evaluation test of the visibility of the outer edge 30a, the low-reflection film 100 with a support was placed in a bright room with fluorescent lighting on the ceiling, so that the low-reflection film 30 was positioned at eye level of the subject. It was hung on the. Next, 10 subjects were made to stand at a position 2 m away from the low-reflection film 30 in a direction perpendicular to the plane on which the low-reflection film 30 is located. Then, the subject was allowed to freely move back and forth between a position 1 m away from the low reflection film 30 and a position 3 m away from the low reflection film 30. Under these conditions, a hearing was conducted to determine whether the outer edge 30a of the low-reflection film 30 was visible.

At this time, if two or fewer subjects answered that the outer edge 30a of the low-reflection film 30 was visible, it was determined that the outer edge 30a was particularly difficult to see. When the number of subjects who answered that the outer edge 30a of the low-reflection film 30 was visually recognized was 3 or more and 4 or less, it was determined that the outer edge 30a was difficult to be visually recognized. When the number of subjects who answered that the outer edge 30a of the low-reflection film 30 was visible was five or more and six or less, it was determined that the outer edge 30a was somewhat easily visible. When the number of subjects who answered that the outer edge 30a of the low-reflection film 30 was visible was 7 or more and 8 or less, it was determined that the outer edge 30a was easily visible. When nine or more subjects answered that the outer edge 30a of the low-reflection film 30 was visible, it was determined that the outer edge 30a was particularly easily visible.

(3) Sensory evaluation test to determine whether the display of the printed area 35 gives the impression that it is floating in the air. A sensory evaluation test was conducted.

In a sensory evaluation test of the visibility of the outer edge 30a, the low-reflection film 100 with a support was placed in a bright room with fluorescent lighting on the ceiling, so that the low-reflection film 30 was positioned at eye level of the subject. It was hung on the. Next, 10 subjects were made to stand at a position 2 m away from the low-reflection film 30 in a direction perpendicular to the plane on which the low-reflection film 30 is located. In this state, a hearing was conducted to determine whether the display of the print area 35 gave the impression that it was floating in the air.

At this time, if 8 or more subjects answered that they had the impression that the display of the print area 35 was floating in the air, it was determined that the display of the print area 35 by the low reflection film 30 was floating in the air. It was determined that the effect of giving such an impression was sufficiently exerted. If seven or fewer subjects answered that they had the impression that the display of the print area 35 was floating in the air, the impression that the display of the print area 35 by the low-reflection film 30 was floating in the air. It was determined that the effect of providing

(4) Visible light reflectance measurement test Next, a visible light reflectance measurement test was conducted on the low reflection film 30.

At this time, first, a sample with a size of 30 mm x 30 mm was cut out from a portion of the obtained low reflection film 30 corresponding to the central area 30e of the transparent area 34. Next, light was irradiated onto the surface of the sample at an incident angle of 5°. At this time, the surface of the sample was irradiated with light containing wavelengths from 380 nm to 780 nm. Then, using a spectrophotometer (manufactured by JASCO Corporation, V-7100), the reflection spectrum of light was measured every 10 nm from wavelength 380 nm to 780 nm, and based on the acquired spectrum data, the visible light reflectance was determined. was calculated. At this time, spectral data was obtained using a calculation formula similar to the calculation formula for obtaining spectral data for plate glass, which is described in JISR3106:2019, and visible light reflectance was calculated from the obtained spectral data.

(5) Test to measure the intensity of reflected light in an environment where light is irradiated from multiple directions Next, a test to measure the intensity of reflected light in an environment where the low reflection film 30 is irradiated with light from multiple directions. was carried out.

In a test to measure the intensity of reflected light in an environment where light is irradiated from multiple directions, the intensity of reflected light in an environment where light is irradiated from multiple directions is measured within a strip-shaped region 30f having a width of 5 mm along the outer edge 30a. The ratio of the maximum value to the average value of the intensity of reflected light in an environment where light is irradiated from a plurality of directions within the band-shaped region 30f was calculated. A test to measure the intensity of reflected light in an environment where light is irradiated from multiple directions was conducted as follows. A piece of black paper was placed on a desk in a bright laboratory with fluorescent lighting on the ceiling. The height of the surface of the desk on which the black paper was placed was 80 cm from the floor. As the black paper, colored drawing paper cut into four pieces manufactured by Kaunet Co., Ltd., black size 542 x 392 mm was used. In addition, no objects other than objects related to the measurement test of the intensity of reflected light in an environment where light is irradiated from multiple directions were placed within 2 m around the black paper. The ceiling height of the laboratory was 300 cm from the floor. One direction in which the short sides of the installed black paper extend is called the front, and the other is called the back. In this case, in the laboratory, the black paper is placed diagonally at 45 degrees forward left, diagonally 45 degrees forward right, diagonally backward 45 degrees to the left, and diagonally backward 45 degrees to the right, based on the position where the black paper is placed. Two 32W fluorescent lights were installed on the ceiling at a distance of 2 m horizontally from the location where they were placed and were lit. Due to this arrangement of fluorescent lamps, the low reflection film 30 is placed in an environment where light is irradiated from multiple directions. In addition, a digital camera (D5600 digital camera manufactured by Nikon Corporation) was set up on a tripod so that the lens surface was located directly above the black paper and 35 cm away from the black paper. As the lens attached to the digital camera, AF-P DX NIKKOR 18-55mmf/3.5-5.6G VR manufactured by Nikon Corporation was used. Then, the low reflection film 30 was placed on the black paper so that the second surface 302 side faced the black paper. The low reflection film 30 was placed on black paper so that the outer edge 30a was located directly below the lens of the digital camera. Then, a digital photograph of the low reflection film 30 was taken from the first surface 301 side. Since the digital camera was installed as described above, a digital photograph was taken from the first surface 301 side of the low reflection film 30 and from a direction perpendicular to the first surface 301 of the low reflection film 30. The photograph was taken in manual mode, without flash, self-timer 10 seconds, ISO sensitivity 100, aperture F14, shutter time 1/2 second, image quality mode High, and the area near the outer edge 30a of the low reflection film 30 was taken. and the central region 30e were included. Note that the illuminance at the location where the low reflection film 30 was placed and the photo was taken was 100 lx. For illuminance measurement, QUAPIX Lite (manufactured by Iwasaki Electric Co., Ltd.), a brightness evaluation application installed on iPhone (registered trademark) 7, was used. Next, part of the obtained photographic data was trimmed to 400 x 1000 pixels. The trimming was performed so that the long side direction of the trimmed area was the direction in which the outer edge 30a extended. The trimmed area corresponded to a band-shaped area 30f having a width of 5 mm along the outer edge 30a. The trimming was performed so that the trimmed area included the area near the outer edge 30a, particularly the area where the first outer edge area 30d was expected to be formed. Thereafter, the trimmed area was analyzed using imageJ, and the brightness value was obtained for each pixel included in the trimmed area. As the brightness value, the brightness of each pixel was converted into a numerical data matrix using imageJ in 255 gray scales of black and white, and the numerical values of these 255 gray scales were used. Then, from the trimmed area, one row of pixels arranged in a row of 400 pixels in the short side direction is selected, and the brightness value of the pixel with the largest brightness value included in the pixel row is changed to the brightness of all pixels included in the pixel row. The ratio of the values to the average value was calculated. The ratio was calculated for 500 or more pixel columns, and the average value of the ratio for the 500 or more pixel columns was calculated. The average value of the calculated ratio is calculated as the maximum value of the intensity of reflected light in the strip region 30f having a length of 5 mm along the outer edge 30a in an environment where light is irradiated from multiple directions. It is defined as the ratio of the intensity of reflected light to the average value in an environment where light is irradiated from multiple directions.

(6) Tactile test of the outer edge of the low-reflection film Next, a tactile test of the outer edge 30a of the low-reflection film 30 was conducted.

In the tactile test of the outer edge 30a of the low-reflection film 30, the low-reflection film 100 with a support portion was suspended so that the low-reflection film 30 was located at the eye level of the subject. Next, Parafilm (registered trademark) was wrapped around the index finger. Next, the side edge 30c of the low reflection film 30 was traced over 20 cm with the index finger wrapped around the film. In this manner, the operation of wrapping the film around the index finger and tracing the side of the low reflection film 30 was repeated five times. Here, Parafilm (registered trademark) is a plastic paraffin film manufactured by Bemis Flexible Packaging. Parafilm® is a soft, stretchable film. If a cut occurs in the Parafilm (registered trademark) by tracing the side of the low-reflection film 30 with a finger wrapped in Parafilm (registered trademark), the user of the low-reflection film 30 can directly trace the side of the low-reflection film 30 with a finger. It is thought that when touching the side, the user tends to feel a prickly sensation.

In the tactile test of the outer edge 30a of the low-reflection film 30, if the above operation is repeated five times and the film is cut less than once, it is sufficient for the user to feel a prickly tactile sensation. It was determined that this was suppressed. If the number of cuts in the film was 2 or more and 3 or less, it was determined that the user's sensation of prickly touch was not sufficiently suppressed. If cuts occurred in the film four or more times, it was determined that the sensation of a prickly touch to the user was not particularly sufficiently suppressed.

(Example 2)
In the cutting process for forming the outer edge 30a of the low reflection film 30, laser processing was used as the cutting process method. Specifically, the laser processing is performed using a laser cutter device (manufactured by Comnet Co., Ltd., product name "GCCLaser Pro 180"), and a bubble buffer material air cushion TK-0642 manufactured by TRUSCO is placed under the low-reflection film 30. The film was cut with a CO2 laser under the following conditions: S setting = extra fine line, mode = Black & White, resolution = 500 dpi, speed 10, power 15. Except for the above, the same procedures as in Example 1 were carried out, including a measurement test for the width W1 of the first outer edge area 30d, a sensory evaluation test for the visibility of the outer edge 30a, and an impression that the display of the printed area 35 was floating in the air. A sensory evaluation test of whether the film was exposed to light, a measurement test of visible light reflectance, a measurement test of the intensity of reflected light in an environment where light is irradiated from multiple directions, and a tactile test of the outer edge 30a of the low reflection film 30 were conducted. As a result of the measurement test of the width W1 of the first outer edge region 30d, it was confirmed that in the low reflection film 30 of Example 2, the width W1 of the first outer edge region 30d was smaller than 100 μm. Further, in the low reflection film 30 of Example 2, the sum of the width W2 of the second outer edge region 30g and the width W1 of the first outer edge region 30d is smaller than 100 μm, and the width W3 of the third outer edge region 30h and the width W1 of the first outer edge region It was confirmed that the total of 30d and width W1 was smaller than 100 μm. Furthermore, in the low reflection film 30 of Example 2, it was confirmed that the width W6 of the first connection region 30m was 5 μm or less, and the width W7 of the second connection region 30n was 5 μm or less.

(Example 3)
In the process of producing the low reflection film 30, E5100 (thickness: 12 μm) manufactured by Toyobo Co., Ltd. was used as a polyethylene terephthalate film instead of Lumirror 50U483 manufactured by Toray Industries, Inc. Except for the above, the same procedures as in Example 1 were carried out, including a measurement test for the width W1 of the first outer edge area 30d, a sensory evaluation test for the visibility of the outer edge 30a, and an impression that the display of the printed area 35 was floating in the air. A sensory evaluation test of whether the film was exposed to light, a measurement test of visible light reflectance, a measurement test of the intensity of reflected light in an environment where light is irradiated from multiple directions, and a tactile test of the outer edge 30a of the low reflection film 30 were conducted. In addition, as a result of the measurement test of the width W1 of the first outer edge region 30d, it was confirmed that in the low reflection film 30 of Example 3, the width W1 of the first outer edge region 30d was smaller than 100 μm. Further, in the low reflection film 30 of Example 3, the sum of the width W2 of the second outer edge region 30g and the width W1 of the first outer edge region 30d is smaller than 100 μm, and the width W3 of the third outer edge region 30h and the width W1 of the first outer edge region It was confirmed that the total of 30d and width W1 was smaller than 100 μm. Further, in the low reflection film 30 of Example 3, it was confirmed that the width W6 of the first connection region 30m was 5 μm or less, and the width W7 of the second connection region 30n was 5 μm or less.

(Comparative example 1)
In the cutting process for forming the outer edge 30a of the low reflection film 30, a process using scissors was used as the cutting process method. Specifically, the scissor processing was performed by using commercially available general scissors and cutting the low reflection film 30 using the scissor blade as a single blade like a cutter. Except for the above, the same procedures as in Example 3 were carried out, including a measurement test for the width W1 of the first outer edge area 30d, a sensory evaluation test for the visibility of the outer edge 30a, and an impression that the display of the printed area 35 was floating in the air. A sensory evaluation test of whether the film was exposed to light, a measurement test of visible light reflectance, a measurement test of the intensity of reflected light in an environment where light is irradiated from multiple directions, and a tactile test of the outer edge 30a of the low reflection film 30 were conducted. As a result of the width measurement test of the first outer edge region, it was confirmed that in the low reflection film 30 of Comparative Example 1, the width W1 of the first outer edge region 30d was 100 μm or more. Further, as a result of the measurement test of the width W1 of the first outer edge region 30d, in the low reflection film 30 of Comparative Example 1, the sum of the width W2 of the second outer edge region 30g and the width W1 of the first outer edge region 30d is 100 μm or more. It was confirmed that the total width W3 of the third outer edge region 30h and the width W1 of the first outer edge region 30d was 100 μm or more.

(Comparative example 2)
In the cutting process for forming the outer edge 30a of the low reflection film 30, a process using scissors was used as the cutting process method. Specifically, the processing with scissors was performed by using commercially available general scissors and cutting the low-reflection film 30 by sandwiching it between two blades in the same manner as how to use scissors normally. Except for the above, the same procedures as in Comparative Example 1 were carried out, including a measurement test for the width W1 of the first outer edge region 30d, a sensory evaluation test for the visibility of the outer edge 30a, and an impression that the display of the printed region 35 was floating in the air. A sensory evaluation test of whether the film was exposed to light, a measurement test of visible light reflectance, a measurement test of the intensity of reflected light in an environment where light is irradiated from multiple directions, and a tactile test of the outer edge 30a of the low reflection film 30 were conducted. As a result of the measurement test for the width of the first outer edge region, it was confirmed that in the low reflection film 30 of Comparative Example 2, the width W1 of the first outer edge region 30d was 100 μm or more. Further, as a result of the measurement test of the width W1 of the first outer edge region 30d, in the low reflection film 30 of Comparative Example 2, the sum of the width W2 of the second outer edge region 30g and the width W1 of the first outer edge region 30d is 100 μm or more. It was confirmed that the total width W3 of the third outer edge region 30h and the width W1 of the first outer edge region 30d was 100 μm or more.

(Comparative example 3)
In the cutting process for forming the outer edge 30a of the low reflection film 30, laser processing was used as the cutting process method. In the settings of the laser cutter device used for laser processing, the speed was set to 15 and the power was set to 20. Except for the above, the same procedures as in Example 2 were carried out, including a measurement test for the width W1 of the first outer edge region 30d, a sensory evaluation test for the visibility of the outer edge 30a, and an impression that the display of the printed region 35 was floating in the air. A sensory evaluation test of whether the film was exposed to light, a measurement test of visible light reflectance, a measurement test of the intensity of reflected light in an environment where light is irradiated from multiple directions, and a tactile test of the outer edge 30a of the low reflection film 30 were conducted. As a result of the width measurement test of the first outer edge region, it was confirmed that in the low reflection film 30 of Comparative Example 3, the width W1 of the first outer edge region 30d was 100 μm or more. Further, as a result of the measurement test of the width W1 of the first outer edge region 30d, in the low reflection film 30 of Comparative Example 3, the sum of the width W2 of the second outer edge region 30g and the width W1 of the first outer edge region 30d is 100 μm or more. It was confirmed that the total width W3 of the third outer edge region 30h and the width W1 of the first outer edge region 30d was 100 μm or more.

The above results are shown in Table 1. Further, the outer edge 30a of the low reflection film 30 in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, and Comparative Example 3 photographed in the measurement test of the width W1 of the first outer edge region 30d. Digital photographs of nearby areas are shown as FIGS. 7A-7F, respectively.

The column “Measurement test of width of first outer edge region” in Table 1 above indicates the width W1 (μm) of the first outer edge region 30d measured in the measurement test of the width W1 of the first outer edge region 30d.

In the column of "Sensory evaluation test of the visibility of the outer edge" in Table 1 above, "1" indicates that the outer edge 30a is particularly difficult to be recognized as a result of the sensory evaluation test of the visibility of the outer edge 30a. It means that. That is, it means that two or less subjects answered that the outer edge 30a of the low-reflection film 30 was visible. "2" means that it has been determined that the outer edge 30a is difficult to visually recognize. That is, it means that the number of subjects who answered that the outer edge 30a of the low reflection film 30 was visually recognized was 3 or more and 4 or less. "4" means that it has been determined that the outer edge 30a is easily visible. That is, it means that the number of subjects who answered that the outer edge 30a of the low reflection film 30 was visually recognized was 7 or more and 8 or less. "5" means that it has been determined that the outer edge 30a is particularly easily recognized. That is, this means that nine or more subjects answered that the outer edge 30a of the low-reflection film 30 was visible.

In the column of "Sensory evaluation test to determine whether the display of the printed area 35 gives the impression that it is floating in the air" in Table 1 above, "〇" means that the display of the printed area 35 gives the impression that it is floating in the air. This means that, as a result of the sensory evaluation test, it was determined that the display of the printed area 35 by the low-reflection film 30 was sufficiently effective in giving the impression that it was floating in the air. In other words, this means that eight or more subjects answered that they received the impression that the display of the print area 35 was floating in the air. "X" indicates that the display of the print area 35 by the low-reflection film 30 gives the impression of floating in the air as a result of a sensory evaluation test to determine whether the display of the print area 35 gives the impression that it is floating in the air. This means that the effect was determined to be insufficient. That is, this means that seven or fewer subjects answered that they had the impression that the display of the print area 35 was floating in the air.

The column "Visible light reflectance measurement test" in Table 1 above shows the visible light reflectance (%) measured in the visible light reflectance measurement test.

The column "Measurement test of the intensity of reflected light in an environment where light is irradiated from multiple directions" in Table 1 above shows the outer edge 30a in the measurement test of the intensity of reflected light in an environment where light is irradiated from multiple directions. Reflection of the maximum intensity of reflected light in an environment where light is irradiated from multiple directions within the strip area 30f with a width of 5 mm along It shows the calculation result of the ratio of light intensity to the average value.

In the column of "tactile test of the outer edge of the low-reflection film" in Table 1 above, "〇" means that the result of the tactile test of the outer edge 30a of the low-reflection film 30 sufficiently suppresses the user's feeling of prickly touch. This means that it has been determined that the That is, it means that in the five repetitions of the operation of wrapping the film around the index finger and tracing the side edge 30c of the low-reflection film 30, the film was cut less than once. "Δ" means that as a result of the tactile test of the outer edge 30a of the low-reflection film 30, it was determined that the sensation of a prickly tactile sensation to the user was not sufficiently suppressed. That is, it means that in the five repetitions of the operation of wrapping the film around the index finger and tracing the side edge 30c of the low-reflection film 30, cuts occurred in the film no less than two times and no more than three times. "X" means that as a result of the tactile test of the outer edge 30a of the low-reflection film 30, it was determined that the sensation of a prickly tactile sensation to the user was not particularly sufficiently suppressed. That is, it means that in the five repetitions of the operation of wrapping the film around the index finger and tracing the side edge 30c of the low-reflection film 30, cuts occurred in the film four or more times.

As a result, as shown in Table 1, in Example 1, Example 2, and Example 3, the width W1 of the first outer edge region 30d was smaller than 100 μm. On the other hand, in Comparative Example 1, Comparative Example 2, and Comparative Example 3, the width W1 of the first outer edge region 30d was 100 μm or more. In addition, in Examples 1, 2, and 3, as shown in FIGS. 7A, 7B, and 7C, even when observing digital photographs taken, the vicinity of the outer edge 30a of the low-reflection film 30 It was found that the width W4 of the visually recognized white area formed in the image was reduced. On the other hand, in Comparative Example 1, Comparative Example 2, and Comparative Example 3, as shown in FIGS. 7D, 7E, and 7F, when observing the taken digital photographs, it is found that It was found that the width W4 of the visually recognized white area formed in the sample was larger than that in Example 1, Example 2, and Example 3. Therefore, as in Example 1, Example 2, and Example 3, the outer edge 30a of the low-reflection film 30 is formed by punching or laser processing, and by particularly adjusting the processing conditions, the first outer edge region It was found that the width W1 of 30d could be made smaller than 100 μm. Furthermore, as in Examples 1, 2, and 3, the outer edge 30a of the low-reflection film 30 is formed by punching or laser processing, and the outer edge 30a of the low-reflection film 30 is formed by particularly adjusting the processing conditions. It has been found that the width W4 of the visually recognized white area formed near 30a can be reduced. Moreover, by referring to FIGS. 7A to 7F, in each of FIGS. 7A to 7F, the width W4 of the visible white area formed near the outer edge 30a of the low reflection film 30 is determined in the direction in which the outer edge 30a extends. was found to be approximately constant.

Further, in Example 1, Example 2, and Example 3, as described above, the sum of the width W2 of the second outer edge region 30g and the width W1 of the first outer edge region 30d is smaller than 100 μm, and the third outer edge region The sum of the width W3 of 30h and the width W1 of the first outer edge region 30d was less than 100 μm. On the other hand, in Comparative Example 1, Comparative Example 2, and Comparative Example 3, as described above, the sum of the width W2 of the second outer edge region 30g and the width W1 of the first outer edge region 30d is 100 μm or more, The total width W3 of the third outer edge region 30h and width W1 of the first outer edge region 30d was 100 μm or more. In addition, in Examples 1, 2, and 3, as shown in FIGS. 7A, 7B, and 7C, even when observing digital photographs taken, the vicinity of the outer edge 30a of the low-reflection film 30 It was found that the width of the visible black area formed in the image became smaller. On the other hand, in Comparative Example 1, Comparative Example 2, and Comparative Example 3, as shown in FIG. It was found that the width of the area covered was increased. Therefore, as in Examples 1, 2, and 3, the outer edge 30a of the low-reflection film 30 is formed by punching or laser processing, and the second outer edge region is formed by particularly adjusting the processing conditions. It was found that the sum of the width W2 of 30g and the width W1 of the first outer edge region 30d can be made smaller than 100 μm, and the sum of the width W3 of the third outer edge region 30h and the width W1 of the first outer edge region 30d can be made smaller than 100 μm. . Furthermore, as in Examples 1, 2, and 3, the outer edge 30a of the low-reflection film 30 is formed by punching or laser processing, and the outer edge 30a of the low-reflection film 30 is formed by particularly adjusting the processing conditions. It has been found that the width of the visually recognized black area formed near 30a can be reduced.

Further, as shown in Table 1, in the sensory evaluation test of the visibility of the outer edge 30a, in Example 1, it was determined that the outer edge 30a was difficult to see. Furthermore, in Examples 2 and 3, it was determined that the outer edge 30a was particularly difficult to visually recognize. On the other hand, in Comparative Example 1, it was determined that the outer edge 30a was particularly easily recognized. Furthermore, in Comparative Examples 2 and 3, it was determined that the outer edge 30a was easily visible. In this way, in Example 1, Example 2, and Example 3, the outer edge 30a was able to be made difficult to be visually recognized.

In addition, as shown in Table 1, in the sensory evaluation test to determine whether the display of the printed area 35 gives the impression that it is floating in the air, in Examples 1, 2, and 3, the low reflection film 30 It was determined that the display of the printed area 35 was sufficiently effective in giving the impression that it was floating in the air. On the other hand, in Comparative Example 1, Comparative Example 2, and Comparative Example 3, it was determined that the effect of giving the impression that the display of the printed area 35 by the low reflection film 30 was floating in the air was insufficient. . In this way, in Examples 1, 2, and 3, the printing area 35 displayed by the low-reflection film 30 was able to give the impression that it was floating in the air.

In addition, as shown in Table 1, in the visible light reflectance measurement test, all of Example 1, Example 2, and Example 3, Comparative Example 1, Comparative Example 2, and Comparative Example 3 showed that the visible light reflectance was was found to be less than 2%.

Further, as shown in Table 1, in the measurement test of the intensity of reflected light in an environment where light is irradiated from multiple directions, in Example 1, Example 2, and Example 3, multiple The ratio of the maximum value of the intensity of reflected light in an environment where light is irradiated from a plurality of directions to the average value of the intensity of reflected light in an environment where light is irradiated from a plurality of directions within the band-shaped region 30f is 1. They were 3, 1.3, and 1.4. On the other hand, in Comparative Example 1, Comparative Example 2, and Comparative Example 3, the ratios were 3.4, 2.2, and 2.3, respectively. In this way, in Example 1, Example 2, and Example 3, the maximum value of the intensity of reflected light in an environment where light is irradiated from multiple directions within the band-shaped region 30f is determined as follows. The average intensity of reflected light in an environment where light is irradiated from multiple directions was reduced by 2.0 times or less.

Furthermore, as shown in Table 1, in the tactile test of the outer edge 30a of the low-reflection film 30, in Examples 1, 2, and 3, the user was sufficiently prevented from feeling a prickly tactile sensation. was. On the other hand, in Comparative Example 1 and Comparative Example 2, the sensation of a prickly touch to the user was not particularly sufficiently suppressed. Furthermore, in Comparative Example 3, the user's sensation of prickly touch was not sufficiently suppressed. In this way, in Examples 1, 2, and 3, it was possible to sufficiently prevent the user from feeling a prickly sensation.

It is also possible to appropriately combine the plurality of components disclosed in each of the above embodiments and modifications as necessary. Alternatively, some components may be deleted from all the components shown in each of the above embodiments and modifications.

30 Low-reflection film 30a Outer edge 30d First outer edge region 30e Central region 30f Belt-shaped region 30g Second outer edge region 30h Third outer edge region 30m First connection region 30n Second connection region 34 Transparent region 35 Printed region 60 Low-reflection film with indicia 61 Indicia 70 Support portion 81 Book cover 82 Book 100 Low-reflection film with support portion

Claims (12)

A low reflection film comprising a printed area and a transparent area, the visible light reflectance in the transparent area being 2% or less,
The low reflection film includes an outer edge,
When the low reflection film is irradiated with light perpendicular to the surface of the low reflection film, the intensity of the specularly reflected light is 1.2 compared to the intensity of the specularly reflected light from the central area of the low reflection film. When defining a continuous area that is twice or more, extending in the direction in which the outer edge extends, and having a distance of 100 μm or less from the outer edge as a first outer edge area, the width W1 of the first outer edge area is Low reflection film smaller than 100μm. When the low-reflection film is irradiated with light perpendicular to the surface of the low-reflection film, the intensity of the specularly reflected light that is formed along the outer edge is the reflected light that is specularly reflected from the central region of the low-reflection film. When defining a continuous region where the intensity is 0.8 times or less as the second outer edge region, the sum of the width W2 of the second outer edge region and the width W1 of the first outer edge region is less than 100 μm,
The intensity of the reflected light formed between the first outer edge area and the second outer edge area and specularly reflected is 0.8 times or more than the intensity of the reflected light specularly reflected from the central area of the low reflection film. The low reflection film according to claim 1, wherein the width of the first connection region is 5 μm or less, which is approximately 1.2 times or less. When the low-reflection film is irradiated with light perpendicular to the surface of the low-reflection film, specular reflection is formed on the side opposite to the outer edge side of the first outer edge region and extends in the direction in which the outer edge extends. When defining a continuous area where the intensity of light is 0.8 times or less as compared to the intensity of the reflected light specularly reflected from the central area of the low reflection film as the third outer edge area, the width W3 of the third outer edge area. and the width W1 of the first outer edge region is less than 100 μm,
The intensity of the reflected light formed between the first outer edge area and the third outer edge area and specularly reflected is 0.8 times or more than the intensity of the reflected light specularly reflected from the central area of the low reflection film. The low-reflection film according to claim 1, wherein the width of the second connecting portion is 5 μm or less, which is approximately 1.2 times or less. The maximum value of the intensity of reflected light in an environment where light is irradiated from multiple directions within a 5 mm strip-shaped area along the outer edge is the maximum value of the intensity of reflected light in an environment where light is irradiated from multiple directions within the strip-shaped area The low reflection film according to claim 1, wherein the intensity of the reflected light is 2.0 times or less as compared to the average value of the intensity of the reflected light. The low reflection film according to claim 1, having a film thickness of 500 μm or less. The two low-reflection films are arranged so that one surface and the other surface of the two low-reflection films are parallel, and the distance between one of the two low-reflection films is 30 cm or less. The low-reflection film according to any one of claims 1 to 5, wherein the visible light transmittance through which visible light passes through the two low-reflection films is 90% or more when the low-reflection film is placed in the low-reflection film. The low reflection film according to any one of claims 1 to 6,
A low reflection film with a support part, comprising: a support part that supports the low reflection film. A book cover comprising the low reflection film according to any one of claims 1 to 6. A book comprising the low reflection film according to any one of claims 1 to 6. A low reflection film comprising a transparent region and having a visible light reflectance of 2% or less in the transparent region,
The low reflection film includes an outer edge,
When the low reflection film is irradiated with light perpendicular to the surface of the low reflection film, the intensity of the specularly reflected light is 1.2 compared to the intensity of the specularly reflected light from the central area of the low reflection film. When defining a continuous area that is twice or more, extending in the direction in which the outer edge extends, and having a distance of 100 μm or less from the outer edge as a first outer edge area, the width W1 of the first outer edge area is Low reflection film smaller than 100μm. The low reflection film according to claim 10,
A low reflection film with a display object, comprising: a display object fixed on the low reflection film. The two low-reflection films with display objects are arranged such that the surface of one of the low-reflection films and the surface of the other low-reflection film of the two low-reflection films with display objects are parallel to each other, and Visible light that passes through the part of the two low-reflection films with display objects that does not have the display object when the distance between one of the low-reflection films with display objects and the other is 30 cm or less The low reflection film with a display object according to claim 11, having a light transmittance of 90% or more.