Low reflection transparent film apparatus with acoustic function

Abstract

To efficiently produce balanced and uniform sound from a transparent film.SOLUTION: A peripheral edge of a transparent film 30 is attached to a film support part 70 via a vibration absorption material 86. A vibrator 85 is attached to the transparent film 30.SELECTED DRAWING: Figure 1D

Description

[Technical Field]

[0001] The present disclosure relates to a low-reflection transparent film device with acoustic functionality. [Background technology]

[0002] Conventionally, when partitions are used to divide spaces, technologies have been developed to reduce noise by using partitions. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-190599 Summary of the Invention [Problem to be solved by the invention]

[0004] As mentioned above, techniques have been developed to reduce noise by using partitions.

[0005] On the other hand, it is also being considered to install partitions to prevent the transfer of droplets such as saliva caused by sneezing or coughing between people facing each other.

[0006] In such cases, if the partition installed between the people facing each other has the function of reducing noise between the spaces separated by the partition, or if the partition itself can emit sounds such as music, the partition's usefulness will increase. There is also a demand for the partition to efficiently emit uniform sound without any bias.

[0007] The present disclosure has been made in consideration of these points, and aims to provide a low-reflection transparent film with an acoustic function that can reduce noise between partitioned spaces, emit sound from itself, emit uniform sound without bias, and emit sound efficiently. [Means for solving the problem]

[0008] The present disclosure relates to a low-reflection transparent film device with an acoustic function, comprising a transparent film having a first surface and a second surface, and a film support frame that supports the periphery of the transparent film, wherein the transparent film includes a first anti-reflection surface that constitutes the first surface and a second anti-reflection surface that constitutes the second surface, a vibrator is provided on the film, and sound is generated from the transparent film by the vibrator, and the periphery of the transparent film is attached to the film support frame via a vibration-absorbing material.

[0009] The present disclosure is a low-reflection transparent film device with an acoustic function, in which the film support frame and the transparent film do not overlap when the transparent film is viewed from a direction perpendicular to the first surface of the transparent film.

[0010] The present disclosure is a low-reflection transparent film device with acoustic function, in which, when the transparent film is viewed from a direction perpendicular to the first surface of the transparent film, the transparent film and the vibration absorbing material overlap, and the vibration absorbing material and the film support frame overlap.

[0011] The present disclosure is a low-reflection transparent film device with acoustic function, in which the vibration absorbing material extends continuously around the entire periphery of the transparent film.

[0012] The present disclosure is a low-reflection transparent film device with acoustic function, in which the vibration absorbing material is attached intermittently around the entire periphery of the transparent film.

[0013] The present disclosure is a low-reflection transparent film device with an acoustic function, in which the vibration transmissibility of the vibration absorbing material is 0.2 or more and 0.5 or less. [Effects of the Invention]

[0014] According to the present disclosure, it is possible to reduce noise between spaces partitioned by an acoustically functional low-reflection transparent film, and to emit sound from the transparent film. In addition, it is possible to efficiently emit uniform sound without bias from the transparent film. [Brief explanation of the drawings]

[0015] [Figure 1A] FIG. 1A is a perspective view showing a partition according to a first embodiment. [Figure 1B] FIG. 1B is a view of the partition shown in FIG. 1A viewed from the horizontal direction (direction B). [Figure 1C] FIG. 1C is a cross-sectional view taken along line CC in FIG. 1B. [Figure 1D] FIG. 1D is a cross-sectional view taken along line DD in FIG. 1B. [Figure 1E] FIG. 1E is a schematic diagram showing the noise reduction effect of the partition. [Figure 2A] FIG. 2A is a cross-sectional view showing an example of a layer structure of the protective film-attached transparent laminate film according to the first embodiment. [Figure 2B] FIG. 2B is a cross-sectional view showing another example of the layer structure of the protective film-attached transparent laminate film according to the first embodiment. [Figure 2C] FIG. 2C is a cross-sectional view showing another example of the layer structure of the protective film-attached transparent laminate film according to the first embodiment. [Figure 2D] FIG. 2D is a cross-sectional view showing another example of the layer structure of the protective film-attached transparent laminate film according to the first embodiment. [Figure 2E] FIG. 2E is a cross-sectional view showing another example of the layer structure of the protective film-attached transparent laminate film according to the first embodiment. [Figure 2F]FIG. 2F is a cross-sectional view showing another example of the layer structure of the protective film-attached transparent laminate film according to the first embodiment. [Figure 3A] FIG. 3A is a plan view showing the state of the phase plane of a sound wave generated from a film speaker. [Figure 3B] FIG. 3B is a plan view showing the state of the phase front of the sound waves of noise passing through the partition. [Figure 3C] FIG. 3C is a plan view showing the state of the phase plane of a sound wave generated from a normal speaker. [Figure 4A] FIG. 4A is a front view showing a method for measuring the sound pressure of sound generated from a transparent laminate film. [Figure 4B] FIG. 4B is a side view showing a method for measuring the sound pressure of the sound generated from the transparent laminate film. [Figure 5] FIG. 5 is a chart showing the results of measuring the sound pressure of the sound generated from the transparent laminated film. [Figure 6] FIG. 6 is a diagram illustrating the vibration transmissibility. [Figure 7] FIG. 7 is a front view showing a partition according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] First Embodiment The first embodiment will be described below with reference to the drawings. FIGS. 1A to 6 are diagrams illustrating the first embodiment. The following figures are schematic diagrams. Therefore, the size and shape of each part are appropriately exaggerated for ease of understanding. Furthermore, appropriate modifications can be made without departing from the technical concept. In the following figures, identical parts are denoted by the same reference numerals, and some detailed descriptions may be omitted. Furthermore, the numerical values, such as dimensions, and material names of each member described in this specification are examples of an embodiment, and are not limited to these and can be selected and used as appropriate. In this specification, terms specifying shapes or geometric conditions, such as parallel, orthogonal, and perpendicular, are interpreted not only strictly but also to include substantially the same state. <partition> First, a partition 10 will be described as an example of an acoustic-function-equipped low-reflection transparent film device according to the present disclosure. Figures 1A to 1E show an example of partition 10 according to a first embodiment. Figure 1B is a view of partition 10 shown in Figure 1A from direction B, Figure 1C is a cross-sectional view taken along line CC in Figure 1B, Figure 1D is a cross-sectional view taken along line DD in Figure 1B, and Figure 1E is a schematic diagram showing the noise-reducing effect of the partition. In this specification, "upper" and "lower" refer to the upper and lower sides, respectively, of partition 10 in its upright position (Figure 1A).

[0017] The partition 10 is placed in a room R, such as a conference room or meeting space. The partition 10 can be used to divide the space of the room R into spaces R1 and R2. The partition 10 can be placed on a desk T placed in the room R. In this case, the top surface of the desk T can be parallel to a horizontal plane G. The partition 10 can also be placed on the desk T, for example, between a user H1 and a user H2 facing the user H1. The partition 10 serves to prevent droplets of saliva and the like from traveling between the users H1 and H2. In FIG. 1A, the users H1 and H2 on the partition 10 can correspond to speakers who speak in the room R. In the example shown in FIGS. 1A and 1B, the partition 10 is placed on the desk T placed inside the room R so as to block the front of the users H1 and H2 facing each other.

[0018] 1A to 1E, the partition 10 includes a transparent laminate film (hereinafter also referred to as a transparent film) 30 and a film support portion 70 consisting of a film support frame that supports the periphery of the transparent laminate film 30. The partition 10 may further include a pair of plate-shaped stand portions 90.

[0019] The shape of the transparent laminate film 30 is not particularly limited and may be determined appropriately depending on the shape of the space partitioned by the partition 10. In the example shown in FIG. 1A, the transparent laminate film 30 has a rectangular shape. The transparent laminate 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 transparent laminate film 30 also has a pair of first sides (side edges) 30a and a pair of second sides (upper and lower edges) 30b that are perpendicular to the first sides 30a. The first sides 30a are perpendicular to a horizontal plane G (see FIG. 1E). The second sides 30b are parallel to the horizontal plane G. The pair of first sides (side edges) 30a extend between the pair of second sides (upper and lower edges) 30b. Other configurations of the transparent laminate film 30 will be described later.

[0020] As described above, the transparent laminate film 30 has a rectangular shape, and a sound-generating vibrator 85 is attached to the periphery of the transparent laminate film 30, for example, approximately in the vertical center of each of a pair of first sides (side edges) 30a, 30a. This vibrator 85 contains a piezoelectric element and a diaphragm, and applying a voltage to the piezoelectric element causes the diaphragm to vibrate. The vibration from the vibrator 85 then causes the transparent laminate film 30 to vibrate, generating sound from the entire transparent film 30. For this reason, the partition 10 having the sound-emitting transparent laminate film 30 can also be called a transparent film device with an acoustic function.

[0021] A voltage is applied to the vibrator 85 from a power source through an amplifier and an electric wire 85a. In this embodiment, the power source and the amplifier are placed in a box 95 attached to one of the stands 90. The box 95 also houses a control unit 96, which will be described later.

[0022] Next, the film support section 70 will be described.

[0023] (film support part) As described above, the film support portion 70 supports the peripheral edges of the transparent laminate film 30, i.e., the pair of first sides 30a and the pair of second sides 30b. The film support portion 70 preferably supports the transparent laminate film 30 in a flattened state. This effectively suppresses light reflection on the transparent laminate film 30.

[0024] 1A, the film support section 70 has an overall rectangular frame shape. Therefore, the film support section 70 can also be referred to as a film support frame. The film support section 70 has a pair of first portions 71 and a pair of second portions 72 extending between the pair of first portions 71. The pair of first portions 71 extend linearly and perpendicular to the horizontal plane G. The pair of second portions 72 extend linearly and parallel to the horizontal plane G. The pair of first portions 71 and the pair of second portions 72 are connected to each other. Note that the manner in which the first portions 71 and the second portions 72 are connected to each other is not particularly limited. For example, the first portions 71 and the second portions 72 may be connected to each other by screwing. Furthermore, the first portions 71 and the second portions 72 may be connected to each other by welding or the like.

[0025] In this embodiment, first portion 71 and second portion 72 of film support portion 70, which is made up of a film support frame, have the same cross-sectional structure over the entire length of first portion 71 and second portion 72 (see FIG. 1C). Here, FIG. 1C shows the cross-sectional structure of first portion 71, and FIG. 1D shows the cross-sectional structure of second portion 72.

[0026] Next, we will describe the attachment structure between the transparent laminate film 30 and the film support part 70. The transparent laminate film 30 is attached to the film support part 70 at its periphery. In this case, the transparent laminate film 30 is attached to the film support part 70 at its periphery via a vibration absorbing material 86 (see FIGS. 1C and 1D).

[0027] As described above, the vibrator 85 that generates sound is attached to the center in the up-down direction of each of the pair of first sides 30a, 30a of the transparent laminate film 30. In this embodiment, the transparent laminate film 30 is attached to the film support part 70 via a vibration absorbing material 86. Furthermore, vibrations generated by the vibrator 85 are transmitted to the transparent laminate film 30, generating sound. In this case, the vibrations transmitted to the transparent laminate film 30 are less likely to be transmitted further from the transparent laminate film 30 to the film support part 70 side because the vibration absorbing material 86 is provided.

[0028] In this way, the energy of the vibrations generated by the vibrator 85 does not leak outward from the transparent laminate film 30, and the vibrations from the vibrator 85 can be efficiently transmitted to the entire transparent laminate film 30. As a result, the vibrations from the vibrator 85 can effectively generate loud sounds uniformly from the transparent laminate film 30.

[0029] The vibration-absorbing material 86 in this embodiment will now be described in further detail. The transparent laminate film 30 is attached to the film support part 70 at its periphery via the vibration-absorbing material 86, which in this case extends continuously in a strip shape around the entire periphery of the transparent laminate film 30.

[0030] The vibration absorbing material 86 may be made of synthetic rubber such as natural rubber, nitrile rubber, butadiene rubber, or butyl rubber, or may be made of silicone or urethane.

[0031] The vibration absorbing material 86 may be made of a material having a foam structure or a material having a gel structure.

[0032] 1A is viewed from direction B, i.e., from a direction perpendicular to the transparent laminate film 30. As shown in FIG. 1B, when the transparent laminate film 30 is viewed from a direction perpendicular to the transparent laminate film 30, the transparent laminate film 30 and the vibration absorbing material 86 partially overlap, and the vibration absorbing material 86 and the film support portion 70 partially overlap (see FIGS. 1B to 1D).

[0033] However, when viewed from a direction perpendicular to the transparent laminate film 30, the film support portion 70 and the transparent laminate film 30 do not overlap each other (see FIGS. 1B to 1D). Preferably, the film support portion 70 and the transparent laminate film 30 are separated by 2 mm or more and 10 mm or less when viewed from a direction perpendicular to the first surface of the transparent laminate film 30. This is because the vibration-absorbing material 86 is tape-like and therefore has a finite thickness. If the separation is less than 2 mm, the film support portion 70 and the transparent laminate film 30 become too close, causing vibrations to be transmitted through the vibration-absorbing material 86. This makes it impossible to prevent vibration transmission by utilizing the width W (described later) of the vibration-absorbing material 86 (which can be much longer than its thickness). On the other hand, if this separation exceeds 10 mm, the transparent laminate film 30 cannot be stably attached to the film support portion 70.

[0034] In this embodiment, the vibration absorbing material 86 provided around the entire circumference of the transparent laminated film 30 has a substantially uniform cross-sectional shape, a thickness T of 0.5 mm or more and 3 mm or less, and a width W of 5 mm or more and 20 mm or less.

[0035] In this case, it is preferable that the width W of the vibration absorbing material 86 is larger than the thickness T. Because the width W of the vibration absorbing material 86 is larger than the thickness T in this manner, the vibrations generated in the transparent laminate film 30 by the vibrator 85 can be effectively absorbed not only in the thickness direction of the vibration absorbing material 86 but also in both width directions.

[0036] Furthermore, when the transparent laminate film 30 is viewed from a direction perpendicular to the transparent laminate film 30, the film support portion 70 and the transparent laminate film 30 do not overlap each other. Therefore, vibrations occurring in the transparent laminate film 30 can be effectively absorbed by the vibration absorbing material 86 along the width direction thereof.

[0037] As the material for the vibration absorbing material 86, in addition to the above, specifically, for example, "3M Flame Retardant VHB Structural Bonding Tape Y-4545-07" manufactured by 3M Japan Ltd. can be used.

[0038] The 3M Flame-Retardant VHB Structural Bonding Tape Y-4545-07 includes a double-sided tape with an acrylic foam substrate and adhesive on both surfaces of the substrate. The acrylic foam substrate provides sufficient vibration absorption.

[0039] In this embodiment, the vibration absorbing material 86 preferably has a vibration transmissibility of 0.2 or more and 0.5 or less.

[0040] Here, the vibration transmissibility refers to the ratio of the vibration generated by the machine 1 to the vibration transmitted to the base 3 when the machine 1 is placed on the base 3 via the vibration absorbing material 2 (see Figure 6).

[0041] Here, if the vibration force generated by the machine is F0(N) and the vibration force transmitted to the table is F(N), then Vibration transmissibility = F / F0.

[0042] In this embodiment, the vibration transmissibility of the vibration absorbing material 86 is 0.2 or more and 0.5 or less. In this case, if the vibration transmissibility of the vibration absorbing material 86 exceeds 0.5, the vibration from the transparent laminate film 30 cannot be reliably absorbed, and the vibration from the transparent laminate film 30 is transmitted to the film support portion 70.

[0043] On the other hand, vibration absorbing material 86 with a vibration transmissibility of less than 0.2 can effectively absorb vibrations from transparent laminate film 30, but it is becoming difficult to obtain materials with such a vibration transmissibility at low cost on the market.

[0044] For this reason, the vibration absorbing material 86 has a vibration transmissibility of 0.2 or more and 0.5 or less.

[0045] As shown in FIG. 1E, as described above, an electric wire 85a extending from the amplifier inside the box 95 is connected to the vibrator 85, but this electric wire 85a extends inside the film support portion 70 and is protected and hidden by this film support portion 70.

[0046] The material of the film support portion 70 is not particularly limited as long as the transparent laminate film 30 is supported in a flattened state by the film support portion 70. The material of the film support portion 70 may be, for example, a metal such as aluminum, iron, or titanium, or an alloy such as stainless steel, or may be a polyolefin resin such as acrylic resin, PET (polyethylene terephthalate) resin, vinyl chloride, or polyethylene polypropylene, or may even be made of wood or paper.

[0047] The configuration of the film support portion 70 is not particularly limited as long as the film support portion 70 can support the transparent laminate film 30. The configuration of the film support portion 70 may be selected depending on the bending stress of the transparent laminate film 30, etc.

[0048] The effect of the partition 10 having the film support portion 70 will be described. As will be described later, by using the transparent laminate film 30 in the partition 10, light reflection in the partition is suppressed compared to a partition panel made of a general acrylic plate. Furthermore, by using the transparent laminate film 30 in the partition 10, the transparency of the partition is improved compared to a partition panel made of a general acrylic plate. On the other hand, the transparent laminate film 30 as described above is more easily bent than the acrylic plates used in general partitions. When the transparent laminate film 30 bends, wrinkles (wavy shapes) may occur on the surface of the transparent laminate film 30, as will be described later, which may make it difficult for users H1 and H2 to see each other.

[0049] In contrast, by supporting the transparent laminate film 30 with the film support portion 70, it is possible to suppress the bending of the transparent laminate film 30 while suppressing light reflection and improving transparency.

[0050] (Stand) Next, the stand unit 90 will be described. The stand unit 90 supports the film support unit 70 so that the first surface 301 of the transparent laminate film 30 is perpendicular to the horizontal plane G. The term "perpendicular" to the horizontal plane G of the first surface 301 of the transparent laminate film 30 is to be interpreted as including the case where the first surface 301 is substantially perpendicular to the horizontal plane G, in addition to the case where the first surface 301 is perpendicular to the horizontal plane G in the strict sense. "Substantially perpendicular" means, for example, that the angle between the first surface 301 and the horizontal plane G is 5° or less, or 3° or less.

[0051] 1A, a pair of stand units 90 are attached to the outside of a pair of first portions 71, 71 of a film support unit 70 that extends linearly and perpendicular to a horizontal plane G. Each stand unit 90 is made of a rectangular plate-like body, and is placed on a desk T with the pair of first portions 71, 71 fixed thereto. In this way, the film support unit 70 is supported on the desk T by the stand units 90.

[0052] The configuration of the stand unit 90 is not particularly limited as long as it can support the film support unit 70. For example, the material of the stand unit 90 is not particularly limited as long as it can support the film support unit 70. The material of the film support unit 70 may be, for example, a metal such as aluminum, iron, or titanium, or an alloy such as stainless steel, or may be an acrylic resin, a PET (polyethylene terephthalate) resin, a polyolefin resin such as vinyl chloride or polyethylene polypropylene, or may even be made of wood or paper. The method of connecting the stand unit 90 to the film support unit 70 is not particularly limited as long as it can support the film support unit 70. For example, the stand unit 90 may be connected to the film support unit 70 by screws. Furthermore, the stand unit 90 may be integrated with the film support unit 70 by welding or the like.

[0053] (Transparent laminated film) Next, the transparent laminate film 30 will be described in detail. As described above, the transparent laminate film 30 is used to constitute the partition 10. The transparent laminate film 30 may have a protective film attached to the first surface 301 or the second surface 302. In this embodiment, a protective film-attached transparent laminate film 60 in which a protective film is attached to the transparent laminate film 30 is described. However, a transparent laminate film 30 without a protective film can also be used as is. FIGS. 2A to 2F show an example of the layer structure of the protective film-attached transparent laminate film 60. As shown in FIGS. 2A to 2F, the protective film-attached transparent laminate film 60 includes the transparent laminate film 30 according to this embodiment, a first-surface protective film 61 that protects the first surface 301 of the transparent laminate film 30, and a second-surface protective film 62 that protects the second surface 302 of the transparent laminate film 30.

[0054] The first-side protective film 61 and the second-side protective film 62 serve to prevent scratches on the first side 301 and the second side 302 of the transparent laminate film 30, respectively, and to prevent contamination of the first side 301 and the second side 302 by foreign matter, etc. The first-side protective film 61 and the second-side protective film 62 are each detachably attached to the transparent laminate film 30. The first-side protective film 61 and the second-side protective film 62 may each include an adhesive layer (not shown) and be attached to the transparent laminate film 30 via this adhesive layer. The adhesive strength of the adhesive layer may be, for example, approximately 0.05 N / 25 mm or more and 5 N / 25 mm or less. When using the partition 10, the first-side protective film 61 and the second-side protective film 62 are each peeled off from the transparent laminate film 30. The first-side protective film 61 and the second-side protective film 62 may be made of, for example, a polyester resin or a polyolefin such as polyethylene or polypropylene.

[0055] Next, the layer structure of the transparent laminate film 30 according to this embodiment will be described. As shown in Figures 2A to 2F, the transparent laminate film 30 includes a first-side antireflection layer 40 that forms the first surface 301, and a second-side antireflection layer 50 that forms the second surface 302. As shown in Figures 2A and 2B, the transparent laminate film 30 may further include a transparent adhesive layer 31 that bonds the first-side antireflection layer 40 and the second-side antireflection layer 50 together.

[0056] 2A and 2B, the transparent laminate film 30 includes, in this order from the first surface 301 to the second surface 302, a first-surface antireflection layer 40, a transparent adhesive layer 31, and a second-surface antireflection layer 50. In this case, in the transparent laminate film 30, the first-surface antireflection layer 40 is exposed outward from the first surface 301 side. In addition, in the transparent laminate film 30, the second-surface antireflection layer 50 is exposed outward from the second surface 302 side.

[0057] 2A and 2B, the first-side antireflection layer 40 includes a first-side antireflection functional layer 41 and a first-side transparent substrate layer 42, which are arranged in this order from the first surface 301 to the second surface 302. The first-side antireflection functional layer 41 also includes a first-side refractive layer 43 and a first-side hard coat layer 44, which are arranged in this order from the first surface 301 to the second surface 302. The first-side refractive layer 43 further includes a first-side low-refractive index layer 45 and a first-side high-refractive index layer 46, which are arranged in this order from the first surface 301 to the second surface 302. Here, the first-side high-refractive index layer 46 may include a first first-side high-refractive index layer 47 and a second first-side high-refractive index layer 48, which are arranged in this order from the first surface 301 to the second surface 302, as shown in FIG. 2B.

[0058] 2A and 2B, the second-side antireflection layer 50 includes a second-side antireflection functional layer 51 and a second-side transparent substrate layer 52, which are arranged in this order from the second surface 302 to the first surface 301. The second-side antireflection functional layer 51 also includes a second-side refractive layer 53 and a second-side hard coat layer 54, which are arranged in this order from the second surface 302 to the first surface 301. The second-side refractive layer 53 further includes a second-side low-refractive index layer 55 and a second-side high-refractive index layer 56, which are arranged in this order from the second surface 302 to the first surface 301. Here, as shown in FIG. 2B, 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, which are arranged in this order from the second surface 302 to the first surface 301.

[0059] 2C and 2D, the transparent laminate film 30 may further include a core layer 32 located between the first-side antireflection layer 40 and the second-side antireflection layer 50. In this case, the transparent laminate film 30 may further include a first transparent adhesive layer 31a that bonds the first-side antireflection layer 40 and the core layer 32 to each other, and a second transparent adhesive layer 31b that bonds the core layer 32 and the second-side antireflection layer 50 to each other.

[0060] 2C and 2D, the transparent laminate film 30 includes, in this order from the first surface 301 to the second surface 302, a first-surface antireflection layer 40, a first transparent adhesive layer 31a, a core layer 32, a second transparent adhesive layer 31b, and a second-surface antireflection layer 50. In this case, too, the first-surface antireflection layer 40 is exposed outward from the first surface 301 side of the transparent laminate film 30. Furthermore, the second-surface antireflection layer 50 is exposed outward from the second surface 302 side of the transparent laminate film 30.

[0061] 2C and 2D, the first-side antireflection layer 40 includes a first-side antireflection functional layer 41 and a first-side transparent substrate layer 42, which are arranged in this order from the first surface 301 to the second surface 302. The first-side antireflection functional layer 41 also includes a first-side refractive layer 43 and a first-side hard coat layer 44, which are arranged in this order from the first surface 301 to the second surface 302. The first-side refractive layer 43 also includes a first-side low-refractive index layer 45 and a first-side high-refractive index layer 46, which are arranged in this order from the first surface 301 to the second surface 302. Here, the first-side high-refractive index layer 46 may include a first first-side high-refractive index layer 47 and a second first-side high-refractive index layer 48, which are arranged in this order from the first surface 301 to the second surface 302, as shown in FIG. 2D.

[0062] 2C and 2D, the second-side antireflection layer 50 includes a second-side antireflection functional layer 51 and a second-side transparent substrate layer 52, which are arranged in this order from the second surface 302 to the first surface 301. The second-side antireflection functional layer 51 also includes a second-side refractive layer 53 and a second-side hard coat layer 54, which are arranged in this order from the second surface 302 to the first surface 301. The second-side refractive layer 53 further includes a second-side low-refractive index layer 55 and a second-side high-refractive index layer 56, which are arranged in this order from the second surface 302 to the first surface 301. Here, as shown in FIG. 2D, 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, which are arranged in this order from the second surface 302 to the first surface 301.

[0063] 2A to 2D, the first-side anti-reflection layer 40 has a basic configuration including a first-side high-refractive index layer 46 and a first-side low-refractive index layer 45 on a first-side transparent substrate layer 42. Also, as described above, the second-side anti-reflection layer 50 has a basic configuration including a second-side high-refractive index layer 56 and a second-side low-refractive index layer 55 on a 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) serve to provide an anti-reflection function through optical interference.

[0064] The first-side antireflection layer 40 (second-side antireflection layer 50) may be provided with an optical interference function of three or more layers by further providing a medium-refractive index layer, but an excessively multi-layer structure is undesirable from a cost-effectiveness perspective. Therefore, the first-side antireflection layer 40 (second-side antireflection layer 50) according to this embodiment is preferably configured to provide antireflection function through optical interference with two layers: a first-side high-refractive index layer 46 (second-side high-refractive index layer 56) and a first-side low-refractive index layer 45 (second-side low-refractive index layer 55). The first-side antireflection layer 40 (second-side antireflection layer 50) may be configured with a first-side hard coat layer 44 (second-side hard coat layer 54) having a medium refractive index, and provide antireflection function through optical interference with three layers: a medium-refractive index layer, a high-refractive index layer, and a low-refractive index layer.

[0065] 2E and 2F, the first-surface refractive layer 43 may not include the first-surface high-refractive-index layer 46. Also, as shown in Figures 2E and 2F, the second-surface refractive layer 53 may not include the second-surface high-refractive-index layer 56.

[0066] Each layer of the transparent laminate film 30 will be described below.

[0067] <First-Side Antireflection Layer and Second-Side Antireflection Layer> The first-side anti-reflection layer 40 is a layer for suppressing reflection of light incident from the first surface 301 of the transparent laminate film 30. By providing the first-side anti-reflection layer 40 to the transparent laminate film 30, light reflection on the first surface 301 of the transparent laminate film 30 can be suppressed. This improves the visibility of user H2's figure, for example, when user H1, who is on the first surface 301 side of the transparent laminate film 30, visually recognizes user H2, who is on the second surface 302 side of the transparent laminate film 30. More specifically, when user H1 visually recognizes user H2, it is possible to prevent user H1's own face, etc., from being reflected on the first surface 301 of the transparent laminate film 30. This prevents user H1 from having difficulty visually recognizing user H2's figure. This improves the visibility of user H2's facial expressions and lip movements, for example, from user H1. This allows for smooth communication between user H1 and user H2. Furthermore, the user H1 can be prevented from feeling discomfort or fatigue due to light reflected on the first surface 301 of the transparent laminate film 30.

[0068] On the other hand, the second-side anti-reflection layer 50 is a layer for suppressing reflection of light incident from the second surface 302 of the transparent laminate film 30. By providing the transparent laminate film 30 with the second-side anti-reflection layer 50, light reflection on the second surface 302 of the transparent laminate film 30 can be suppressed. This improves the visibility of the figure of user H1, for example, when user H2, who is on the second surface 302 side of the transparent laminate film 30, visually recognizes user H1, who is on the first surface 301 side of the transparent laminate film 30. More specifically, when user H2 visually recognizes user H1, reflection of user H2's own face, etc., on the second surface 302 of the transparent laminate film 30 can be suppressed. This prevents user H2 from having difficulty visually recognizing user H1. This improves the visibility of user H1's facial expressions and lip movements, for example, from user H2. This allows for smooth communication between user H1 and user H2. It is also possible to prevent user H2 from feeling discomfort or fatigue due to light reflected on the second surface 302 of the transparent laminate film 30. As described above, the first-side antireflection layer 40 and the second-side antireflection layer 50 are both made of layers for suppressing reflection, and therefore the transparent laminate film 30 having such a first-side antireflection layer 40 and second-side antireflection layer 50 can also be called a low-reflection transparent laminate film.

[0069] As described above, the first-side antireflection layer 40 has a first-side antireflection functional layer 41 and a first-side transparent substrate layer 42. As described above, the second-side antireflection layer 50 has a second-side antireflection functional layer 51 and a second-side transparent substrate layer 52. Here, the first-side transparent substrate layer 42 and the second-side transparent substrate layer 52 will first be described.

[0070] [First surface transparent substrate layer and second surface transparent substrate layer] The first-side transparent substrate layer 42 and the second-side transparent substrate layer 52 are layers that support the first-side antireflection functional layer 41 and the second-side antireflection functional layer 51, for example, and also serve to increase the overall strength of the first-side antireflection layer 40 and the second-side antireflection layer 50. There are no particular restrictions on the material for the first-side transparent substrate layer 42 and the second-side transparent substrate layer 52, as long as they are transparent materials that are commonly used as substrates for films; however, from the standpoints of material cost, productivity, etc., plastic films, plastic sheets, etc. are preferably used, and these can be selected appropriately depending on the application.

[0071] Examples of materials for plastic films or sheets include various synthetic resins. Preferred examples of synthetic resins include cellulose resins such as triacetyl cellulose (TAC), diacetyl cellulose, acetate butyrate cellulose, and cellophane; polyester resins such as polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate-isophthalate copolymer, and polyester-based thermoplastic elastomers; polyolefin resins such as low-density polyethylene (including linear low-density polyethylene), medium-density polyethylene, high-density polyethylene, ethylene-α-olefin copolymer, polypropylene, polymethylpentene, polybutene, ethylene-propylene copolymer, propylene-butene copolymer, olefin-based thermoplastic elastomers, and mixtures thereof; acrylic resins such as polymethyl(meth)acrylate, polyethyl(meth)acrylate, and polybutyl(meth)acrylate; polyamide resins such as nylon 6 and nylon 66; polystyrene resin; polycarbonate resin; polyarylate resin; and polyimide resin. Furthermore, the material of the first-side transparent substrate layer 42 and the second-side transparent substrate layer 52 may be a cycloolefin polymer (COP) resin or a cycloolefin copolymer (COC) resin.

[0072] The first-side transparent substrate layer 42 and the second-side transparent substrate layer 52 can be made of the above-mentioned plastic films and plastic sheets, either alone or as a mixture of two or more of them, but from the viewpoints of flexibility, toughness, transparency, etc., cellulose resin and polyester resin are more preferred as the materials for the first-side transparent substrate layer 42 and the second-side transparent substrate layer 52. Furthermore, from the viewpoints of flexibility, toughness, transparency, etc., the first-side transparent substrate layer 42 and the second-side transparent substrate layer 52 preferably contain triacetyl cellulose and polyethylene terephthalate.

[0073] The thicknesses of the first-side transparent substrate layer 42 and the second-side transparent substrate layer 52 are not particularly limited and can be appropriately selected depending on the application. The thicknesses of the first-side transparent substrate layer 42 and the second-side transparent substrate layer 52 may each be approximately 5 μm to 130 μm, and preferably 10 μm to 100 μm in consideration of durability, handleability, and the like. The thickness of each layer can be calculated by measuring the thickness at three locations on a cross-sectional image taken using, for example, a scanning electron microscope (SEM) or a scanning transmission electron microscope (STEM) and averaging the values ​​at the three locations. When the film thickness to be measured is on the order of μm, it is preferable to use an SEM. When the film thickness is on the order of nm, it is preferable to use an STEM. When using an SEM, the acceleration voltage is preferably 1 kV to 10 kV, and when using an STEM, the acceleration voltage is preferably 10 kV to 30 kV. The film thickness of each layer described below can also be measured using the same method as for the film thickness of the first-side transparent substrate layer 42 and the second-side transparent substrate layer 52.

[0074] [First-side anti-reflection functional layer and second-side anti-reflection functional layer] Next, we will explain the first-side antireflection functional layer 41 and the second-side antireflection functional layer 51. The first-side antireflection functional layer 41 and the second-side antireflection functional layer 51 serve to impart the function of suppressing light reflection to the first-side antireflection layer 40 and the second-side antireflection layer 50, respectively.

[0075] Furthermore, the first-side antireflection functional layer 41 may be a coating layer coated on the first-side transparent substrate layer 42, and the second-side antireflection functional layer 51 may be a coating layer coated on the second-side transparent substrate layer 52. In this way, by having the first-side antireflection functional layer 41 and the second-side antireflection functional layer 51 be coating layers, the thicknesses of the first-side antireflection functional layer 41 and the second-side antireflection functional layer 51 can be easily controlled, and desired functions such as the light reflectance and total light transmittance of the transparent laminate film 30 can be easily controlled.

[0076] The first-side antireflection functional layer 41 and the second-side antireflection functional layer 51 are preferably made of a cured product containing an acrylic monomer, which allows the first-side antireflection functional layer 41 and the second-side antireflection functional layer 51 to be formed with high uniformity even with short processing times.

[0077] Here, as described above, the first-side antireflection functional layer 41 includes the first-side refractive layer 43 and the first-side hard coat layer 44. Also, as described above, the second-side antireflection functional layer 51 includes the second-side refractive layer 53 and the second-side hard coat layer 54. The first-side hard coat layer 44 may be a coating layer coated on the first-side transparent substrate layer 42, and the first-side refractive layer 43 may be a coating layer coated on the first-side hard coat layer 44. Also, the second-side hard coat layer 54 may be a coating layer coated on the second-side transparent substrate layer 52, and the second-side refractive layer 53 may be a coating layer coated on the second-side hard coat layer 54. In this way, since the first surface refraction layer 43, the first surface hard coat layer 44, the second surface refraction layer 53 and the second surface hard coat layer 54 are coating layers, the thickness of each layer can be easily controlled, and desired functions such as the light reflectance, total light transmittance and, in some cases, color of the transparent laminate film 30 can be easily controlled.

[0078] Next, the first-side hard coat layer 44 and the second-side hard coat layer 54 will be described.

[0079] {First-side hard coat layer and second-side hard coat layer} The first-side hard coat layer 44 and the second-side hard coat layer 54 serve to improve the scratch resistance of the first-side antireflection layer 40 and the second-side antireflection layer 50. Here, "hard coat" refers to a property that exhibits a hardness of "H" or higher in the pencil hardness 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 curable resin compositions include thermosetting resin compositions and ionizing radiation-curable resin compositions, with ionizing radiation-curable resin compositions being preferred from the viewpoint of scratch resistance.

[0080] A thermosetting resin composition is a composition containing at least a thermosetting resin, and is a resin composition that cures when heated. Examples of thermosetting resins include acrylic resins, urethane resins, phenolic resins, urea-melamine resins, epoxy resins, unsaturated polyester resins, and silicone resins. In a thermosetting resin composition, a curing agent is added to the curable resin as needed.

[0081] 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 groups, vinyl groups, and allyl groups, as well as epoxy groups and oxetanyl groups. The ionizing radiation-curable compound is preferably a compound having an ethylenically unsaturated bond group, more preferably a compound having two or more ethylenically unsaturated bond groups, and even more preferably a polyfunctional (meth)acrylate compound having two or more ethylenically unsaturated bond groups. Both monomers and oligomers can be used as the polyfunctional (meth)acrylate compound. Ionizing radiation refers to electromagnetic waves or charged particle beams that have an energy quantum capable of polymerizing or crosslinking molecules, among electromagnetic waves or charged particle beams. Ultraviolet (UV) rays or electron beams (EB) are typically used, but other types of electromagnetic waves such as X-rays and gamma rays, as well as charged particle beams such as alpha rays and ion beams, can also be used.

[0082] Among the polyfunctional (meth)acrylate compounds, examples of bifunctional (meth)acrylate monomers include ethylene glycol di(meth)acrylate, bisphenol A tetraethoxydiacrylate, bisphenol A tetrapropoxydiacrylate, and 1,6-hexanediol 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, dipentaerythritol tetra(meth)acrylate, and isocyanuric acid-modified tri(meth)acrylate. The (meth)acrylate monomers may be monomers whose molecular skeletons are partially modified, or may be monomers modified with ethylene oxide, propylene oxide, caprolactone, isocyanuric acid, alkyl, cyclic alkyl, aromatic, bisphenol, or the like.

[0083] Examples of polyfunctional (meth)acrylate oligomers include acrylate polymers such as urethane (meth)acrylate, epoxy (meth)acrylate, polyester (meth)acrylate, and polyether (meth)acrylate. Urethane (meth)acrylates can be obtained, for example, by reacting a polyhydric alcohol and an organic diisocyanate with a hydroxy (meth)acrylate. Preferred epoxy (meth)acrylates include (meth)acrylates obtained by reacting a trifunctional or higher aromatic epoxy resin, alicyclic epoxy resin, aliphatic epoxy resin, or the like with (meth)acrylic acid; (meth)acrylates obtained by reacting a difunctional or higher aromatic epoxy resin, alicyclic epoxy resin, aliphatic epoxy resin, or the like with a polybasic acid and (meth)acrylic acid; and (meth)acrylates obtained by reacting a difunctional or higher aromatic epoxy resin, alicyclic epoxy resin, aliphatic epoxy resin, or the like with a phenol and (meth)acrylic acid. The above ionizing radiation-curable compounds can be used alone or in combination of two or more.

[0084] 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, thioxanthones, and the like. These photopolymerization initiators preferably have a melting point of 100°C or higher. By adjusting the melting point of the photopolymerization initiator to 100°C or higher, it is possible to prevent the residual photopolymerization initiator from sublimating due to the heat generated during the transparent conductive film formation or crystallization process, thereby preventing the reduction in resistance of the transparent conductive film from being impaired. The same applies when using photopolymerization initiators in the high refractive index layer and low refractive index layer described below. The photopolymerization accelerator is a material that can reduce polymerization inhibition caused by air during curing and increase the curing speed, and examples thereof include one or more types selected from p-dimethylaminobenzoic acid isoamyl ester, p-dimethylaminobenzoic acid ethyl ester, etc.

[0085] The thickness of each of the first-side hard coat layer 44 and the second-side hard coat layer 54 is preferably in the range of 0.1 μm to 100 μm, and more preferably in the range of 0.8 μm to 20 μm. If the thicknesses 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 is obtained, and the layer is resistant to cracks and breakage due to external impacts.

[0086] The refractive index of the first-side hard coat layer 44 and the second-side hard coat layer 54 is preferably smaller than the refractive index of the first-side high refractive index layer 46 and the second-side high refractive index layer 56, more preferably 1.45 to 1.70, and even more preferably 1.45 to 1.60. When the refractive index of the first-side hard coat layer 44 and the second-side hard coat layer 54 falls within this range, the first-side hard coat layer 44 and the second-side hard coat layer 54 each function as a medium refractive index layer. This enables interference between the three layers of the first-side hard coat layer 44, first-side high refractive index layer 46, and first-side low refractive index layer 45, as well as interference between the three layers of the second-side hard coat layer 54, second-side high refractive index layer 56, and second-side low refractive index layer 55. This effectively suppresses light reflection. Furthermore, from the viewpoint of suppressing interference fringes, it is preferable to reduce the difference between the refractive index of the first-side hard coat layer 44 and the second-side hard coat layer 54 and the refractive index of the first-side transparent substrate layer 42 and the second-side transparent substrate layer 52.

[0087] Methods for imparting the first-side hard coat layer 44 and the second-side hard coat layer 54 with the function of a medium refractive index layer include blending a high-refractive index resin into the hard coat layer coating solution and blending high-refractive index particles. Blending high-refractive index particles can cause whitening or coating defects due to particle aggregation, so the former method (blending a high-refractive index resin) is preferred. Examples of high-refractive index resins include the above-mentioned thermosetting resins or ionizing radiation-curable compounds into which sulfur-, phosphorus-, or bromine-containing groups or aromatic rings have been introduced. The high-refractive index particles can be similar to those used in the first-side high-refractive index layer 46 and the second-side high-refractive index layer 56 described below.

[0088] The refractive index of each layer, such as the first-side hard coat layer 44 and the second-side hard coat layer 54, can be calculated, for example, by fitting a reflection spectrum measured with a reflectance photometer to a reflection spectrum calculated from an optical model of a multilayer thin film using Fresnel coefficients.

[0089] The first-side hard coat layer 44 and the second-side hard coat layer 54 can be formed by preparing a coating liquid for forming a hard coat layer using the above-mentioned curable resin composition, additives such as an ultraviolet absorber and a leveling agent which are blended as necessary, and a dilution solvent, applying the coating liquid onto a transparent substrate by a conventionally known coating method, drying the coating liquid, and curing it by irradiation with ionizing radiation as necessary.

[0090] {First surface refractive layer and second surface refractive layer} Next, the first-side refractive layer 43 and the second-side refractive layer 53 will be described. The first-side refractive layer 43 and the second-side refractive layer 53 serve to reduce the light reflectance of the first-side antireflection layer 40 and the second-side antireflection layer 50. As described above, the first-side refractive layer 43 includes a first-side low-refractive index layer 45 and a first-side high-refractive index layer 46. As described above, the second-side refractive layer 53 includes a second-side low-refractive index layer 55 and a second-side high-refractive index layer 56. Here, the first-side low-refractive index layer 45 and the second-side low-refractive index layer 55 will first be described.

[0091] (First surface low refractive index layer and second surface low refractive index layer) The first-side low-refractive-index layer 45 and the second-side low-refractive-index layer 55 are layers provided on the first-side high-refractive-index layer 46 and the second-side high-refractive-index layer 56, and use the difference in refractive index between them to reduce the light reflectance of the first-side anti-reflection layer 40 and the second-side anti-reflection layer 50 through interference. In order to provide the first-side anti-reflection layer 40 and the second-side anti-reflection layer 50 with ultra-low reflectance, the first-side low-refractive-index layer 45 and the second-side low-refractive-index layer 55 preferably have a refractive index of 1.26 or more and 1.40 or less, more preferably 1.28 or more and 1.38 or less, and even more preferably 1.30 or more and 1.32 or less. The lower the refractive index of the first-side low refractive index layer 45 and the second-side low refractive index layer 55, the lower the refractive index of the first-side antireflection layer 40 and the second-side antireflection layer 50 can be without significantly increasing the refractive index of the first-side high refractive index layer 46 and the second-side high refractive index layer 56. On the other hand, if the refractive index of the first-side low refractive index layer 45 and the second-side low refractive index layer 55 is made too low, the strength of the first-side low refractive index layer 45 and the second-side low refractive index layer 55 tends to decrease. Therefore, by setting the refractive index of the first-side low refractive index layer 45 and the second-side low refractive index layer 55 within the above ranges, the amount of high refractive index particles (described below) added to the first-side high refractive index layer 46 and the second-side high refractive index layer 56 can be reduced while maintaining the strength of the first-side low refractive index layer 45 and the second-side low refractive index layer 55, which is advantageous in that it leads to suppression of color and whitening. The thickness of each of the first-side low refractive index layer 45 and the second-side low refractive index layer 55 is preferably 80 nm to 120 nm, more preferably 85 nm to 110 nm, and even more preferably 90 nm to 105 nm. The first-side low refractive index layer 45 and the second-side low refractive index layer 55 may each be formed from multiple layers satisfying the above-mentioned refractive index ranges, but from the viewpoint of cost-effectiveness, two or less layers are preferred, and a single layer is more preferred.

[0092] Methods for forming the first-side low refractive index layer 45 and the second-side low refractive index layer 55 can be broadly divided into wet methods and dry methods. Wet methods include a sol-gel method using a metal alkoxide or the like, a method of applying a low refractive index resin such as a fluororesin, and a method of applying a low refractive index layer-forming coating liquid in which low refractive index particles are incorporated into 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 layers by physical vapor deposition or chemical vapor deposition. Wet methods are superior in terms of production efficiency, and in this embodiment, among wet methods, it is preferable to form the layers using a low refractive index layer-forming coating liquid in which low refractive index particles are incorporated into a resin composition.

[0093] Low refractive index particles are preferably used to reduce the refractive index, i.e., to improve antireflection properties. Either inorganic particles such as silica or magnesium fluoride, or organic particles can be used without any restrictions. However, from the viewpoint of further improving antireflection properties and ensuring good surface hardness, particles having a structure in which the particles themselves have voids are preferably used.

[0094] Particles with a porous structure have microscopic voids inside, which are filled with a gas such as air with a refractive index of 1.0, resulting in a low refractive index. Examples of such porous particles include inorganic or organic porous particles and hollow particles, such as porous silica, hollow silica particles, and porous polymer particles or hollow polymer particles made from acrylic resins. Preferred examples of inorganic particles include porous silica particles prepared using the technology disclosed in JP-A-2001-233611. Preferred examples of organic particles include hollow polymer particles prepared using the technology disclosed in JP-A-2002-80503. The refractive index of the porous silica or porous silica described above is in the range of 1.18 to 1.44, which is lower than that of typical silica particles, which have a refractive index of around 1.45. Therefore, these silica particles are preferred from the perspective of achieving a low refractive index for the first-side low-refractive-index layer 45 and the second-side low-refractive-index layer 55.

[0095] 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 with a structure having internal cavities. The hollow silica particles are silica particles whose refractive index decreases in inverse proportion to the occupancy rate of the internal cavities compared to the inherent refractive index of the silica particles (refractive index n = approximately 1.45). Therefore, the refractive index of the hollow silica particles as a whole is 1.18 or more and 1.44 or less.

[0096] The hollow silica particles are not particularly limited, and examples thereof include particles having an outer shell and a porous or hollow interior, such as silica particles prepared using the techniques disclosed in JP-A-6-330606, JP-A-7-013137, JP-A-7-133105, and JP-A-2001-233611.

[0097] The average particle diameter of the primary particles of the low-refractive-index particles is preferably 5 nm to 200 nm, more preferably 5 nm to 100 nm, and even more preferably 10 nm to 80 nm. When the average particle diameter of the primary particles is within the above range, the transparency of the first-side low-refractive-index layer 45 and the second-side low-refractive-index layer 55 is not impaired and a good particle dispersion state is obtained. In particular, hollow particles having an average particle diameter of 70 nm to 80 nm are preferred because they can increase the porosity and reduce the refractive index while maintaining a shell thickness that does not result in insufficient strength, and also provide an excellent balance with the ideal thickness (approximately 100 nm) of the first-side low-refractive-index layer 45 and the second-side low-refractive-index layer 55 for reducing reflectance.

[0098] The low-refractive-index particles used in this embodiment are preferably surface-treated particles. Surface treatment of the low-refractive-index particles is more preferably performed using a silane coupling agent, and among these, surface treatment using a silane coupling agent having a (meth)acryloyl group is preferred. By performing a surface treatment on the low-refractive-index particles, the affinity with the binder resin described below is improved, the particles are uniformly dispersed, and aggregation of particles is less likely to occur. This prevents a decrease in the transparency of the first-side low-refractive-index layer 45 and the second-side low-refractive-index layer 55 due to particle size increase caused by aggregation, as well as a decrease in the applicability of the layer-forming composition and the coating strength of the composition.

[0099] Furthermore, when the silane coupling agent has a (meth)acryloyl group, the silane coupling agent is ionizing radiation-curable and therefore readily reacts with the binder resin described below, thereby effectively fixing the low-refractive index particles to the binder resin in the coating film of the layer-forming composition. In other words, the low-refractive index particles function as a crosslinker in the binder resin. This provides a tightening effect for the entire coating film, imparting excellent surface hardness to the first-side low-refractive index layer 45 and the second-side low-refractive index layer 55 while retaining the inherent flexibility of the binder resin. Therefore, the first-side low-refractive index layer 45 and the second-side low-refractive index layer 55 utilize their own flexibility to deform, providing them with the ability to absorb and restore external impacts, thereby reducing the occurrence of scratches and resulting in a layer with high surface hardness and excellent scratch resistance.

[0100] Examples of silane coupling agents that are preferably used in the surface treatment of low refractive index particles include 3-(meth)acryloxypropyltrimethoxysilane, 3-(meth)acryloxypropyltriethoxysilane, 3-(meth)acryloxypropylmethyldimethoxysilane, 3-(meth)acryloxypropylmethyldiethoxysilane, 2-(meth)acryloxypropyltrimethoxysilane, and 2-(meth)acryloxypropyltriethoxysilane.

[0101] The content of low-refractive-index particles in the first-side low-refractive-index layer 45 and the second-side low-refractive-index layer 55 is preferably 10 to 250 parts by mass, more preferably 50 to 200 parts by mass, and even more preferably 100 to 180 parts by mass, per 100 parts by mass of the resin in the first-side low-refractive-index layer 45 and the second-side low-refractive-index layer 55. When the content of low-refractive-index particles falls within the above range, good anti-reflection properties and surface hardness are obtained. Furthermore, the proportion of hollow particles and / or porous particles in the total low-refractive-index particles contained in the first-side low-refractive-index layer 45 and the second-side low-refractive-index layer 55 is preferably 70% by mass or more, more preferably 80% by mass or more, and even more preferably 80% by mass or more and 95% by mass or less.

[0102] Resin compositions contained in the layer-forming coating liquid include, first, curable resin compositions. The curable resin compositions can be similar to the materials exemplified in the description of the first-side hard coat layer 44 and the second-side hard coat layer 54, with ionizing radiation-curable resin compositions being preferred. Furthermore, fluorine-containing polymers and fluorine monomers that themselves exhibit a low refractive index are also preferred resin compositions. Fluorine-containing polymers are polymers of polymerizable compounds that contain at least fluorine atoms in the molecule, and are suitable for imparting antifouling properties and slip properties. The fluorine-containing polymer is preferably a polymer that has reactive groups in the molecule and functions as a curable resin composition, and more preferably a polymer that has ionizing radiation-curable reactive groups and functions as an ionizing radiation-curable resin composition.

[0103] The fluorine-containing polymer is preferably a polymer containing silicon as well as fluorine, in order to not only repel dirt from the surface of the low refractive index layer but also to provide the repelled dirt with easy wiping properties. For example, a silicone-containing vinylidene fluoride copolymer, in which a silicone component is incorporated into the copolymer, is preferred. Examples of silicone components in this case 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, methylhydrogen silicone, silanol-group-containing silicone, alkoxy-group-containing silicone, phenol-group-containing silicone, methacrylic-modified silicone, acrylic-modified silicone, amino-modified silicone, carboxylic acid-modified silicone, carbinol-modified silicone, epoxy-modified silicone, mercapto-modified silicone, fluorine-modified silicone, and polyether-modified silicone. Among these, components having a dimethylsiloxane structure are preferred as the silicone component.

[0104] The first-side low refractive index layer 45 and the second-side low refractive index layer 55 can be formed, for example, by preparing a layer-forming coating liquid using low refractive index particles, a resin composition, additives such as an ultraviolet absorber and a leveling agent, which are blended as necessary, and a dilution solvent, and then applying the coating liquid onto the first-side high refractive index layer 46 or the second-side high refractive index layer 56 by a conventionally known coating method, drying, and, if necessary, curing by exposure to ionizing radiation.

[0105] (First surface high refractive index layer and second surface high refractive index layer) The first-side high refractive index layer 46 and the second-side high refractive index layer 56 serve to reduce the light reflectance of the first-side antireflection layer 40 and the second-side antireflection layer 50 through interference, utilizing the difference in refractive index between them and the first-side low refractive index layer 45 and the second-side low refractive index layer 55. The first-side high refractive index layer 46 and the second-side high refractive index layer 56 can each be formed from a layer-forming coating liquid containing, for example, a curable resin composition and high refractive index particles.

[0106] The first-side high-refractive-index layer 46 and the second-side high-refractive-index layer 56 preferably have a high refractive index from the viewpoint of achieving ultra-low reflectance for the first-side anti-reflection layer 40 and the second-side anti-reflection layer 50. However, a high refractive index requires a large amount of high-refractive-index particles, which can lead to aggregation of the high-refractive-index particles and cause whitening. For this reason, the refractive index is preferably 1.55 to 1.85, and more preferably 1.56 to 1.70. The thickness of the first-side high-refractive-index layer 46 and the second-side high-refractive-index layer 56 is preferably 200 nm or less, and more preferably 50 nm to 180 nm. When the first-side high-refractive-index layer 46 and the second-side high-refractive-index layer 56 each have a two-layer structure as described below, the total thickness of the two layers preferably satisfies the above-mentioned value. The first-side high-refractive-index layer 46 and the second-side high-refractive-index layer 56 may be formed from multiple layers satisfying the above-mentioned refractive index range. However, from the viewpoint of cost-effectiveness, two or fewer layers are preferred, and a single layer is more preferred.

[0107] Examples of high-refractive-index particles include antimony pentoxide (1.79), zinc oxide (1.90), titanium oxide (2.3 to 2.7), cerium oxide (1.95), tin-doped indium oxide (1.95 to 2.00), antimony-doped tin oxide (1.75 to 1.85), yttrium oxide (1.87), and zirconium oxide (2.10). The parentheses indicate the refractive index of the material of each particle. Among these high-refractive-index particles, particles with a refractive index exceeding 2.0 are preferred, as they can achieve the desired 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 the plasma oscillation of these free electrons, some light in the visible light region is absorbed or reflected, making it difficult to suppress color. For this reason, the high-refractive index particles are preferably non-conductive particles. For these reasons, among the high-refractive index particles exemplified above, titanium oxide and zirconium oxide are preferred, with zirconium oxide being the most suitable from the viewpoint of high durability and stability, such as light resistance. If it is desired to impart antistatic properties to the first-side antireflection layer 40 and the second-side antireflection layer 50, it is preferred that the first-side high-refractive index layer 46 and the second-side high-refractive index layer 56 have a two-layer structure, as described below, with conductive high-refractive index particles contained in one of the layers.

[0108] The average particle size 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 size of the primary particles of the high refractive index particles and the low refractive index particles described later can be calculated by the following steps (1) to (3).

[0109] (1) Surface images of the particles themselves or of a material prepared by coating and drying a particle dispersion on a transparent substrate are taken using SEM, TEM, or STEM.

[0110] (2) Randomly extract 10 particles from the surface image, measure the long and short diameters of each particle, and calculate the particle diameter of each particle from the average of the long and short diameters. The long diameter is the longest diameter on the screen, and the short diameter is the distance between the two points where a line segment perpendicular to the midpoint of the line segment that constitutes the long diameter intersects with the particle.

[0111] (3) Repeat the same procedure five times on separate images of the same sample, and use the number average of the particle diameters of a total of 50 particles as the average particle diameter.

[0112] When calculating the average particle size of particles, if the calculated average particle size is on the order of μm, it is preferable to use an SEM, and if the calculated average particle size is on the order of nm, it is preferable to use a transmission electron microscope (TEM) or STEM. In the case of an SEM, the acceleration voltage is preferably 1 kV or more and 10 kV or less, and in the case of a TEM or STEM, the acceleration voltage is preferably 10 kV or more and 30 kV or less.

[0113] From the viewpoint of a balance between increasing the refractive index, suppressing color tone, and suppressing whitening, the content of the high refractive index particles is preferably 30 parts by mass or more and 400 parts by mass or less, more 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, relative to 100 parts by mass of the curable resin composition.

[0114] The first-surface high-refractive-index layer 46 and the second-surface high-refractive-index layer 56 are preferably dispersion-stabilized to prevent excessive aggregation of the high-refractive-index particles. One example of a dispersion-stabilizing method is to add another high-refractive-index particle with a lower surface charge than the base high-refractive-index particle. This method allows the base high-refractive-index particles to moderately gather around the other high-refractive-index particle, thereby preventing excessive aggregation of the base high-refractive-index particles. Other dispersion-stabilizing methods include using surface-treated high-refractive-index particles or adding a dispersant to the layer-forming coating solution.

[0115] The curable resin compositions forming the first-side high refractive index layer 46 and the second-side high refractive index layer 56 can be similar to the materials exemplified in the description of the first-side hard coat layer 44 and the second-side hard coat layer 54, and an ionizing radiation-curable resin composition is preferred. Furthermore, to achieve the above-mentioned refractive index without adding an excessive amount 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 approximately 1.54 or more and 1.70 or less.

[0116] As described above, the first-side high refractive index layer 46 may include a first first-side high refractive index layer 47 and a second first-side high refractive index layer 48. In this case, the refractive index of the first first-side high refractive index layer 47 is preferably higher than the refractive index of the second first-side high refractive index layer 48. This increases the difference in refractive index between the first-side high refractive index layer 46 and the first-side low refractive index layer 45, thereby reducing the reflectance of the first-side antireflection layer 40 and reducing the difference in refractive index between the first-side high refractive index layer 46 and the first-side hard coat layer 44, thereby suppressing the occurrence of interference fringes.

[0117] 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, as with 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 be higher than the refractive index of the second second-side high refractive index layer 58. This increases the refractive index difference between the second-side high refractive index layer 56 and the second-side low refractive index layer 55, thereby reducing 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.

[0118] Furthermore, when the first-side high-refractive-index layer 46 and the second-side high-refractive-index layer 56 each have a two-layer structure, the refractive index of the first first-side high-refractive-index layer 47 and the first second-side high-refractive-index layer 57 is preferably 1.60 or more and 1.85 or less, and the refractive index of the second first-side high-refractive-index layer 48 and the second second-side high-refractive-index layer 58 is preferably 1.55 or more and 1.70 or less. Furthermore, in the two-layer structure, it is preferable that one layer contains conductive high-refractive-index particles and the other layer contains non-conductive high-refractive-index particles, and that the thickness of the layer containing the conductive high-refractive-index particles is less than the thickness of the layer containing the non-conductive high-refractive-index particles. This structure can impart antistatic properties while minimizing the amount of conductive high-refractive-index particles, which can cause color tint. Furthermore, conductive high-refractive-index particles are preferably networked within the layer to impart antistatic properties with a small amount, thereby suppressing color tint and whitening.

[0119] The first-side high refractive index layer 46 and the second-side high refractive index layer 56 can be formed by preparing a layer-forming coating liquid using high refractive index particles, a curable resin composition, and additives such as an ultraviolet absorber and a leveling agent, which are blended as necessary, and a dilution solvent, and then applying the coating liquid onto the first-side hard coat layer 44 or the second-side hard coat layer 54 by a conventionally known coating method, drying the coating liquid, and curing it by irradiation with ionizing radiation as necessary.

[0120] [Transparent adhesive layer, first transparent adhesive layer, and second transparent adhesive layer] Transparent adhesive layers such as the transparent adhesive layer 31, the first transparent adhesive layer 31a, and the second transparent adhesive layer 31b are layers for bonding the first-side antireflection layer 40, the second-side antireflection layer 50, the core layer 32, and the like to one another. Here, the term "transparent adhesive layer" in this specification encompasses a transparent adhesive layer. Transparent adhesive layers can be formed using various materials commonly used as adhesives. Examples include acrylic adhesives, urethane adhesives, olefin adhesives, rubber adhesives, silicone adhesives, and polyester adhesives. Acrylic adhesives, which have high transparency and can increase adhesive strength, are preferred.

[0121] Each of the above adhesives can contain various functionalizing agents, stabilizers, etc., as long as transparency is not impaired. Tackifiers can also be added to enhance adhesive strength. Crosslinking agents, such as isocyanates, epoxies, and double-bond-containing compounds, can be used to form crosslinked structures depending on the resin.

[0122] The transparent adhesive layer can also be formed using a type of adhesive (OCA, Optical Clear Adhesive) laminated on both sides with a release film. Commercially available products can also be used as the transparent adhesive layer. Examples of commercially available products that can be used as the transparent adhesive layer include the LUCIACS series of optically transparent adhesive sheets (manufactured by Nitto Denko Corporation), the 5400A series of highly transparent double-sided tapes (manufactured by Sekisui Chemical Co., Ltd.), the Opteria series of optical adhesive sheets (manufactured by Lintec Corporation), the SANCUARY series (manufactured by San-A Kaken Co., Ltd.), the OAD series of optically transparent adhesives (manufactured by Toyo Packaging Co., Ltd.), the RA series of optical coreless double-sided tapes (manufactured by Sumiron Co., Ltd.), and the PD-S1 series of Panaclean adhesives (manufactured by Panac Corporation). The adhesive strength of these adhesives is generally 10 N / 25 mm or more.

[0123] 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. If the thickness of the transparent adhesive layer is 2 μm or more, the first-side antireflection layer 40, the second-side antireflection layer 50, etc. can be reliably bonded, and if the thickness of the transparent adhesive layer is 200 μm or less, 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.

[0124] The method for forming the transparent adhesive layer is not particularly limited, and can employ known methods used in the production of pressure-sensitive adhesive tapes, etc. Specifically, the transparent adhesive layer can be formed by any method, such as a method in which a coating of a pressure-sensitive adhesive composition prepared by dissolving or dispersing the components forming the transparent adhesive layer in an appropriate organic solvent or water is applied to the surface of a substrate, followed by drying and curing, a method in which the components forming the transparent adhesive layer, a double bond-containing monomer, an oligomer, a crosslinking agent, etc. are applied to a substrate without a solvent, and then crosslinked by radiation or the like, or an extrusion lamination method.

[0125] When using OCA, a transparent adhesive layer can be formed by peeling off the release film on the light release side of the OCA and bonding the adhesive surface to the substrate.

[0126] [Core layer] The core layer 32 serves to support the first-side antireflection layer 40 and the second-side antireflection layer 50. As the material for the core layer 32, the same materials as those for the first-side transparent substrate layer 42 and the second-side transparent substrate layer 52 described above can be used.

[0127] There are no particular limitations on the thickness of the core layer 32 and it is selected appropriately depending on the application. The thickness of the core layer 32 may be approximately 5 μm or more and 130 μm or less, and considering durability, handling, etc., it is preferably 10 μm or more and 100 μm or less.

[0128] The thickness of the transparent laminate film 30 described above is preferably 300 μm or less. By making the thickness of the transparent laminate film 30 300 μm or less, it is possible to improve the transparency of the transparent laminate film 30. From the viewpoint of improving transparency and making conversations easier to hear, the thickness of the transparent laminate film 30 is more preferably 260 μm or less, and even more preferably 200 μm or less.

[0129] From the viewpoint of reducing the thickness of the transparent laminate film 30, the transparent laminate film 30 not including the core layer 32 as shown in Figures 2A and 2B is preferable to the transparent laminate film 30 including the core layer 32 as shown in Figures 2C and 2D. The transparent laminate film 30 not including the core layer 32 as shown in Figures 2A and 2B makes it particularly easy to reduce the thickness of the transparent laminate film 30 to 200 μm or less.

[0130] Note that if the upper limit of the thickness of the transparent laminate film 30 is limited as described above, the transparent laminate film 30 will be easily bent. On the other hand, from the viewpoint of preventing the occurrence of wrinkles (wavy shapes) on the surface of the transparent laminate film 30 due to wind or the like, it is preferable that the transparent laminate film 30 be less likely to bend beyond a certain level. By preventing the occurrence of wrinkles (wavy shapes) on the surfaces (first surface 301, second surface 302) of the transparent laminate film 30, it is possible to prevent the users H1 and H2 from having difficulty in seeing each other due to the wrinkles (wavy shapes).

[0131] The thickness of the transparent laminate film 30 may be, for example, 60 μm or more and 300 μm or less. When the thickness of the transparent laminate film 30 is 60 μm or more, the transparent laminate film 30 becomes less likely to bend, to the extent that the occurrence of wrinkles (wavy shapes) on the surface of the transparent laminate film 30 is suppressed. Furthermore, when the thickness of the transparent laminate film 30 is 60 μm or more, the movement of droplets such as saliva between users H1 and H2 facing each other across the partition 10 can be effectively suppressed. Furthermore, when the thickness of the transparent laminate film 30 is 300 μm or less, it becomes easier to hear what the other person is saying when conversing through the partition 10.

[0132] The height (vertical distance) of the transparent laminate film 30 may be, for example, 300 mm to 900 mm, and preferably 450 mm to 700 mm. The width (horizontal distance) of the transparent laminate film 30 may be, for example, 300 mm to 1800 mm, and preferably 450 mm to 1200 mm.

[0133] The above-described transparent laminate film 30 has a bending stress of, for example, 6 N / 20 mm or less.

[0134] By using the above-described transparent laminate film 30 in the partition 10, light reflection in the partition 10 is suppressed. For example, light reflection is suppressed more than in a partition that uses a partition panel made of a general acrylic plate. Furthermore, by using the above-described transparent laminate film 30 in the partition 10, the transparency of the partition 10 is improved. For example, the transparency of the partition 10 is improved more than in a partition that uses a partition panel made of a general acrylic plate.

[0135] The light reflectance of the transparent laminate film 30 described above is preferably 3.0% or less. Here, the light reflectance of the transparent laminate film 30 refers to both the reflectance of light incident from the first surface 301 side of the transparent laminate film 30 and the reflectance of light incident from the second surface 302 side of the transparent laminate film 30. In other words, a light reflectance of 3.0% or less means that the reflectance of light incident from the first surface 301 side of the transparent laminate film 30 is 3.0% or less, and the reflectance of light incident from the second surface 302 side of the transparent laminate film 30 is 3.0% or less. This further improves the visibility of the transparent laminate film 30 when viewed from the first surface 301 side and when viewed from the second surface 302 side. The light reflectance is more preferably 1.0% or less.

[0136] The transparent laminate film 30 preferably has a total light transmittance (JIS K7361-1:1997) of 90% or more. This further improves the visibility of the transparent laminate film 30 when viewed from the first surface 301 side, while also further improving the visibility of the transparent laminate film 30 when viewed from the second surface 302 side. The transparent laminate film 30 more preferably has a total light transmittance of 92% or more, and even more preferably 95% or more. The transparent laminate film 30 preferably has a haze (JIS K7136:2000) of 3.0% or less, more preferably 2.0% or less, and even more preferably 1.5% or less.

[0137] In the above-described transparent laminate film 30, the arithmetic mean roughness Ra (JIS B0601:1994) of each of the first surface 301 and the second surface 302 is preferably 10 nm or less, and more preferably 1 nm or more and 8 nm or less. Furthermore, the ten-point mean roughness Rz (JIS B0601:1994) of each of the first surface 301 and the second surface 302 is preferably 160 nm or less, and more preferably 50 nm or more and 155 nm or less. When Ra and Rz are within the above ranges, the first surface 301 and the second surface 302 have smoothness and improved scratch resistance.

[0138] The puncture strength of the above-described transparent laminate film 30 is preferably 10.0 N or more. A sufficiently high puncture strength ensures sufficient strength to prevent breakage of the transparent laminate film 30 when the transparent laminate film 30 is used for the partition 10. A method for measuring the puncture strength will be described in Example 1 below.

[0139] As described above, such a partition 10 can be placed in a room R, such as a conference room or meeting space, and used to divide the space of the room R (see FIGS. 1A and 1B). In this embodiment, a building B equipped with such a partition 10 is also provided. <Method of manufacturing transparent laminated film and partition> Next, a method for manufacturing the transparent laminate film 30 and the partition 10 according to this embodiment will be described. First, a method for manufacturing the transparent laminate film 30 will be described.

[0140] First, first-side antireflection layer 40 is prepared. In this process, for example, a resin film constituting first-side transparent substrate layer 42 is first prepared. Next, a hard coat layer-forming coating liquid is applied to the resin film, dried, and irradiated with ultraviolet light to form first-side hard coat layer 44. Next, a high refractive index layer-forming coating liquid is applied to first-side hard coat layer 44, dried, and irradiated with ultraviolet light to form first-side high refractive index layer 46. Next, a low refractive index layer-forming coating liquid is applied to first-side high refractive index layer 46, dried, and irradiated with ultraviolet light to form first-side low refractive index layer 45. In this manner, first-side antireflection layer 40 is obtained.

[0141] Second-side antireflection layer 50 is also prepared. In this process, for example, first, a resin film constituting second-side transparent substrate layer 52 is prepared. Next, a hard coat layer-forming coating liquid is applied to the resin film, dried, and irradiated with ultraviolet light to form second-side hard coat layer 54. Next, a high refractive index layer-forming coating liquid is applied to second-side hard coat layer 54, dried, and irradiated with ultraviolet light to form second-side high refractive index layer 56. Next, a low refractive index layer-forming coating liquid is applied to second-side high refractive index layer 56, dried, and irradiated with ultraviolet light to form second-side low refractive index layer 55. In this manner, second-side antireflection layer 50 is obtained.

[0142] Then, the first-side antireflection layer 40 and the second-side antireflection layer 50 are bonded to each other via the transparent adhesive layer 31 to produce the transparent laminate film 30. In this manner, the transparent laminate film 30 can be produced.

[0143] Next, a first-side protective film 61 is attached to the first side 301 of the obtained transparent laminate film 30, and a second-side protective film 62 is attached to the second side 302. At this time, the first-side protective film 61 and the second-side protective film 62 may each include an adhesive layer (not shown) and be attached to the transparent laminate film 30 by this adhesive layer. In this manner, the transparent laminate film 60 with protective films can be produced. Note that the first-side protective film 61 and the second-side protective film 62 may be attached separately to the first-side antireflection layer 40 and the second-side antireflection layer 50, respectively, before the first-side antireflection layer 40 and the second-side antireflection layer 50 are bonded to each other via the transparent adhesive layer 31.

[0144] Next, the partition 10 is created.

[0145] In this process, first, the protective film-attached transparent laminate film 60 is processed into a predetermined shape. When producing the partition 10 shown in Figures 1A to 1E, the protective film-attached transparent laminate film 60 is cut into a rectangular shape having a pair of first sides 30a and a pair of second sides 30b.

[0146] Next, the first surface protective film 61 and the second surface protective film 62 are removed from the protective film-attached transparent laminate film 60 that has been processed into a predetermined shape, thereby obtaining the transparent laminate film 30 that has been processed into a predetermined shape.

[0147] Thereafter, the transparent laminate film 30 is supported by the film support part 70. At this time, the transparent laminate film 30 is supported by the film support part 70 in a state in which the first surface 301 and the second surface 302 are flattened. In addition, the stand part 90 is connected to the film support part 70. In this way, the partition 10 is produced.

[0148] A method for manufacturing the partition 10 will now be described in detail.

[0149] First, the vibrator 85 is attached to the periphery of the transparent laminate film 30, for example, at a desired position on the pair of first sides (side edges) 30a, 30a, specifically at approximately the center in the vertical direction of the pair of first sides 30a, 30a.

[0150] Next, a vibration absorbing material 86 in the form of a double-sided tape, for example, having a base material and adhesive provided on one surface of the base material, is attached around the entire periphery of the transparent laminate film 30. Next, the transparent laminate film 30 is attached to the film support part 70 via the vibration absorbing material 86.

[0151] Thereafter, a box 95 containing a power supply and an amplifier and accommodating a control unit 96 is attached to the outer surface of one of the stand units 90 .

[0152] In this case, an electric wire 85a extends between the vibrator 85 attached to the transparent laminated film 30 and the box 95, and this electric wire 85a is arranged between the vibrator 85 and the box 95 along the film support portion 70.

[0153] As shown in FIGS. 1A and 1B, the vibrator 85 attached to the transparent laminated film 30 and the electric wire 85a extending from the vibrator 85 both extend along the first portions 71, 71 of the film support portion .

[0154] The partition 10 thus fabricated is placed on the desk T, thereby dividing the room R into spaces R1 and R2.

[0155] In using the partition 10, for example, consider a case where a user H1 in the space R1 is a customer and a user H2 in the space R2 is a store staff member.

[0156] In this case, user H2, who is a store staff member, can operate the partition 10 to prevent noise from leaking into the space R2 toward user H1, who is a customer, and thereby activate the noise reduction function of the partition 10 to reduce the noise in the space R2. On the other hand, user H2 can also turn off the noise reduction function of the partition 10 as needed to have a conversation with user H1, who is a customer.

[0157] Next, the noise reduction function of the partition 10 operated by the user H2 will be described.

[0158] As shown in Fig. 1A, user H2 operates operating device 98 as needed to drive vibrator 85 via control unit 96. In this case, as shown in Fig. 1E, there is a noise source 100 within space R2, and noise from noise source 100 can be received by reference microphone 97. The sound (noise) from reference microphone 97 is then input to control unit 96. Control unit 96 vibrates vibrator 85 so that a sound that cancels out the sound sent from reference microphone 97 is generated from transparent laminate film 30.

[0159] The noise reduction effect of the transparent laminate film 30 of the partition 10 will be further described with reference to FIGS. 3A to 3C.

[0160] 3A to 3C are plan views showing the state of the phase front of the sound wave when the partition 10 is provided.

[0161] When a normal solid speaker 10A is provided in the partition 10, sound waves are transmitted from the partition 10 as concentric dome waves (see FIG. 3C).

[0162] Furthermore, sound waves of noise from noise source 100 in space R2 are diffracted by partition 10, becoming plateau-shaped plane waves and propagating toward space R1 (see FIG. 3B).

[0163] On the other hand, when the transparent laminate film 30 functions as a film speaker as in this embodiment, sound waves from the transparent laminate film 30 are also transmitted as plateau-shaped plane waves (see FIG. 3A).

[0164] As shown in Fig. 3B, noise from noise source 100 in space R2 propagates from transparent laminate film 30 of partition 10 toward space R1 as a plateau-like plane wave, and as shown in Fig. 3A, sound waves from transparent laminate film 30 also propagate toward space R1 as plateau-like plane waves, similar to the noise from noise source 100. This allows the noise propagating from space R2 toward space R1 to be effectively canceled out by the sound from transparent laminate film 30. This ensures that noise propagating from space R2 toward space R1 is reduced.

[0165] In this embodiment, as described above, the transparent laminate film 30 can be made to actuate to reduce noise within the space R2, but this is not limited to this, and the control unit 96 can also be operated to activate the vibrator 85 and play a predetermined piece of music from the transparent laminate film 30.

[0166] As described above, according to this embodiment, by activating the vibrator 85, sound is generated by the transparent laminate film 30 of the partition 10, which makes it possible to prevent noise from space R2 from being transmitted to space R1 by the transparent laminate film 30. Alternatively, by playing desired music from the transparent laminate film 30, a comfortable environment can be provided for users H1 and H2 in spaces R1 and R2.

[0167] Furthermore, since the sound waves of noise that are diffracted and transmitted through the transparent laminate film 30 of the partition 10 and the sound waves of sound from the transparent laminate film 30 are approximately the same plateau-shaped plane waves, the sound from the transparent laminate film 30 can be diffracted through the transparent laminate film 30 of the partition 10, effectively reducing noise (see Figures 3A and 3B).

[0168] Additionally, the transparent laminate film 30 is attached to the film support part 70 along its entire periphery via a vibration absorbing material 86. In this case, the transparent laminate film 30 is attached to the film support part 70 along its entire periphery via the vibration absorbing material 86 so that it has a predetermined tension. This allows the film support part 70 to apply a desired tension to the transparent laminate film 30. This allows sound to be generated accurately from the entire transparent laminate film 30, and the transparent laminate film 30 can function as a highly accurate film speaker.

[0169] Furthermore, a pair of vibrators 85 are attached to the transparent laminate film 30, and each vibrator 85 is located at the center of each of the pair of first sides (side edges) 30a, 30a of the transparent laminate film 30 in the up-down direction.

[0170] Therefore, the pair of vibrators 85 are arranged in point-symmetric positions with respect to the center of the rectangular transparent laminated film 30 on the plane.

[0171] Therefore, when the sound waves transmitted from the pair of vibrators 85 to the transparent laminate film 30 are superimposed, a substantially uniform vibration can be generated throughout the transparent laminate film 30, thereby generating a uniform sound from the entire transparent laminate film 30.

[0172] The partition 10 also includes a transparent laminate film 30 having a first surface 301 and a second surface 302, and a film support portion 70 that supports the transparent laminate film 30. The transparent laminate film 30 includes a first-surface antireflection layer 40 that forms the first surface 301 and a second-surface antireflection layer 50 that forms the second surface 302. This structure suppresses reflection of light incident from the first surface 301 side of the transparent laminate film 30 and reflection of light incident from the second surface 302 side of the transparent laminate film 30. This improves visibility of the transparent laminate film 30 when viewed from the first surface 301 side and the second surface 302 side. This allows users H1 and H2, who are facing each other across the partition 10, to easily see each other. This allows for smooth communication between users H1 and H2. Furthermore, the users H1 and H2 can be prevented from feeling discomfort or fatigue due to light reflected on the first surface 301 or the second surface 302 of the transparent laminate film 30.

[0173] Furthermore, since the partition 10 is provided with the transparent laminate film 30, it is possible to make it easier to hear what the other person is saying when conversing through the partition 10. This allows for smooth communication between the users H1 and H2. The fact that the above-mentioned effects can be achieved will be explained in the examples below.

[0174] Furthermore, according to the present embodiment, the transparent laminate film 30 further includes a core layer 32 located between the first-side antireflection layer 40 and the second-side antireflection layer 50. This improves the durability and handleability of the transparent laminate film 30.

[0175] Furthermore, according to this embodiment, the transparent laminate film 30 includes a first transparent adhesive layer 31a that bonds the first-side antireflection layer 40 and the core layer 32, and a second transparent adhesive layer 31b that bonds the core layer 32 and the second-side antireflection layer 50. This makes it possible to easily produce a transparent laminate film 30 that includes the core layer 32 located between the first-side antireflection layer 40 and the second-side antireflection layer 50.

[0176] Furthermore, according to the present embodiment, the transparent laminate film 30 further includes a transparent adhesive layer 31 that bonds the first-side antireflection layer 40 and the second-side antireflection layer 50 together. This makes it possible to easily produce a transparent laminate film 30 that includes the first-side antireflection layer 40 and the second-side antireflection layer 50.

[0177] Furthermore, according to the present embodiment, the film support portion 70 supports the transparent laminate film 30 in a flattened state. This makes it possible to prevent bending of the transparent laminate film 30. As a result, it is possible to effectively prevent light reflection from the transparent laminate film 30.

[0178] Furthermore, according to this embodiment, the partition 10 further includes a stand portion 90 that supports the film support portion 70 so that the first surface 301 of the transparent laminate film 30 is perpendicular to the horizontal plane G. This allows the film support portion 70 to be supported so that the first surface 301 of the transparent laminate film 30 is perpendicular to the horizontal plane G.

[0179] Furthermore, according to this embodiment, the transparent laminate film 30 is attached to the film support part 70 around the entire periphery via vibration absorbing material 86. Because the vibrator 85 is attached to the transparent laminate film 30, vibrations generated from the vibrator 85 are transmitted to the transparent laminate film 30, but because the transparent laminate film 30 is attached to the film support part 70 via the vibration absorbing material 86, the vibration energy of the transparent laminate film 30 does not leak to the film support part 70 side.

[0180] Therefore, the vibration generated by the vibrator 85 can be transmitted to the entire transparent laminated film 30 without leakage to the film support part 70 side, and as a result, the vibration from the vibrator 85 can effectively generate a loud sound from the transparent laminated film 30 in a uniform state. [Example]

[0181] Next, a specific example of this embodiment will be described.

[0182] This example corresponds to the first embodiment shown in Figures 1A to 3C. In this example, first, a rectangular transparent laminate film (600 mm x 900 mm) 30 was prepared.

[0183] Next, a total of two vibrators 85 were attached to a pair of side edges 30 a, 30 a of the transparent laminated film 30 .

[0184] Next, the transparent laminate film 30 was attached to the film support portion 70 via a vibration absorbing material 86 that extended in a strip shape along the entire periphery of the transparent laminate film 30 .

[0185] Thereafter, the vibrator 85 was activated, and vibrations generated from the vibrator 85 were transmitted throughout the entire transparent laminate film 30, causing sounds to be generated from the transparent laminate film 30. In this case, sounds of 250 Hz and 1000 Hz were generated from the transparent laminate film 30.

[0186] Next, the volume of the sound (sound pressure) generated from the transparent laminate film 30 was measured using a sound level meter 110. The measurement locations were a position abutting the transparent laminate film 30 (position 0 cm) and a position 50 cm away from the transparent laminate film 30, as shown in Figures 4A and 4B, and measurements were taken at 15 positions (1) to (15) at each position, i.e., a total of 30 positions.

[0187] Each of the points (1) to (15) is located on the periphery and the center of the transparent laminate film 30 (see FIG. 4A).

[0188] As the sound level meter 110, a digital sound level meter manufactured by Sanwa Supply Co., Ltd. was used.

[0189] The sound pressure measurement results obtained using this sound level meter are shown in Figure 5. The unit of sound pressure measured in Figure 5 is decibels (db).

[0190] Next, as a comparative example, a transparent laminate film 30 was prepared which was attached directly to the film support portion 70 without using the vibration absorbing material 86 .

[0191] The sound volume (sound pressure) generated from the transparent laminate film 30 was measured using a sound level meter 110 under the same measurement conditions except that the transparent laminate film 30 was attached directly to the film support part 70 without using the vibration absorbing material 86.

[0192] The measurement results of the comparative example are shown in FIG.

[0193] 5, when the transparent laminate film 30 is attached to the film support part 70 via vibration absorbing material 86 around the entire periphery and a sound of 250 Hz is generated from the transparent laminate film 30 (in the case of this embodiment), the average value of the sound pressure (db) at 15 points is higher when the distance from the transparent laminate film 30 to the sound level meter is 0 cm than when the transparent laminate film 30 is attached directly to the film support part 70 without using the vibration absorbing material 86 (in the case of the comparative example).It can also be seen that the standard deviation of the sound pressure (db) is smaller, indicating less variation.

[0194] Furthermore, when a sound of 250 Hz is generated from the transparent laminate film 30 and the distance from the transparent laminate film 30 to the sound level meter is 50 cm, in the present embodiment, the average value of the sound pressure (db) at 15 points is higher than in the comparative example, and the standard deviation of the sound pressure (db) is smaller, resulting in less variation.

[0195] Furthermore, when a sound of 1000 Hz is generated from the transparent laminate film 30 and the distance from the transparent laminate film 30 to the sound level meter is 0 cm, in the present embodiment, the average value of the sound pressure (db) at 15 points is higher than in the comparative example, and the standard deviation of the sound pressure (db) is smaller, resulting in less variation.

[0196] Furthermore, when a sound of 1000 Hz is generated from the transparent laminate film 30 and the distance from the transparent laminate film 30 to the sound level meter 110 is 50 cm, in the present embodiment, the average value of the sound pressure (db) at 15 points is higher than in the comparative example, and the standard deviation of the sound pressure (db) is smaller, resulting in less variation.

[0197] As described above, according to this embodiment, the transparent laminate film 30 is attached to the film support part 70 via the vibration absorbing material 86 provided along the entire periphery of the film, so that it is possible to increase the average sound pressure (db) of the entire transparent laminate film 30. In addition, it is possible to reduce the standard deviation of the sound pressure (db), thereby minimizing the variation in sound pressure. <Second embodiment> Next, a second embodiment will be described with reference to Fig. 7. The second embodiment shown in Fig. 7 differs only in the attachment structure between the transparent laminate film 30 and the film support portion 70, and other configurations are substantially the same as those of the first embodiment shown in Figs. 1A to 6.

[0198] In the second embodiment shown in FIG. 7, the same parts as those in the first embodiment shown in FIGS. 1A to 6 are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0199] The attachment structure between the transparent laminate film 30 and the film support part 70 will be described with reference to Figure 7. The transparent laminate film 30 is attached to the film support part 70 at its periphery. In this case, the transparent laminate film 30 is attached to the film support part 70 at its periphery via a vibration absorbing material 86 (see Figures 1C and 1D).

[0200] As described above, the vibrator 85 that generates sound is attached to the center in the up-down direction of each of the pair of first sides 30a, 30a of the transparent laminate film 30. In this embodiment, the transparent laminate film 30 is attached to the film support part 70 via a vibration absorbing material 86. Furthermore, vibrations generated by the vibrator 85 are transmitted to the transparent laminate film 30, generating sound. In this case, the vibrations transmitted to the transparent laminate film 30 are less likely to be transmitted further from the transparent laminate film 30 to the film support part 70 side because the vibration absorbing material 86 is provided.

[0201] In this way, the energy of the vibrations generated by the vibrator 85 does not leak outward from the transparent laminate film 30, and the vibrations from the vibrator 85 can be efficiently transmitted to the entire transparent laminate film 30. As a result, the vibrations from the vibrator 85 can effectively generate loud sounds uniformly from the transparent laminate film 30.

[0202] The vibration-absorbing material 86 in this embodiment will now be described in further detail. The transparent laminate film 30 is attached to the film support part 70 at its periphery via the vibration-absorbing material 86. In this case, the vibration-absorbing material 86 is provided intermittently along the entire periphery of the transparent laminate film 30.

[0203] The vibration absorbing material 86 may be made of synthetic rubber such as natural rubber, nitrile rubber, butadiene rubber, or butyl rubber, or may be made of silicone or urethane.

[0204] The vibration absorbing material 86 may be made of a material having a foam structure or a material having a gel structure.

[0205] 7 is a front view of the partition 10, i.e., a view of the transparent laminate film 30 viewed from a direction perpendicular to the transparent laminate film 30. As shown in FIG. 7, when the transparent laminate film 30 is viewed from a direction perpendicular to the transparent laminate film 30, the transparent laminate film 30 and the vibration absorbing material 86 partially overlap, and the vibration absorbing material 86 and the film support portion 70 partially overlap.

[0206] However, when viewed from a direction perpendicular to the transparent laminate film 30, the film support portion 70 and the transparent laminate film 30 do not overlap. Preferably, the film support portion 70 and the transparent laminate film 30 are separated by 2 mm or more and 10 mm or less when viewed from a direction perpendicular to the transparent laminate film 30. The reason for this is that even the vibration absorbing material 86 is tape-like and therefore has a finite thickness. If the separation is less than 2 mm, the film support portion 70 and the transparent laminate film 30 become too close, causing vibrations to be transmitted through the vibration absorbing material 86, making it impossible to prevent vibration transmission using the length L of the vibration absorbing material 86 (which can be much longer than the thickness, as described below). On the other hand, if this separation length exceeds 10 mm, the transparent laminate film 30 cannot be stably attached to the film support portion 70.

[0207] In this embodiment, a plurality of vibration absorbing materials 86, for example, 20 pieces, are provided along the entire periphery of the transparent laminate film 30. Each vibration absorbing material 86 has a substantially identical cross-sectional shape, and its thickness T is 0.5 mm or more and 3 mm or less. Furthermore, the length L of each vibration absorbing material 86 from the inside to the outside of the transparent laminate film 30 is 5 mm or more and 20 mm or less.

[0208] In this case, it is preferable that the length L of the vibration absorbing material 86 is greater than the thickness T. Since the length L of the vibration absorbing material 86 is greater than the thickness T in this manner, the vibrations generated in the transparent laminate film 30 by the vibrator 85 can be effectively absorbed not only in the thickness direction of the vibration absorbing material 86 but also in both the length directions.

[0209] Furthermore, when the transparent laminate film 30 is viewed from a direction perpendicular to the transparent laminate film 30, the film support portion 70 and the transparent laminate film 30 do not overlap each other. Therefore, vibrations occurring in the transparent laminate film 30 can be effectively absorbed by the vibration absorbing material 86 along the length direction thereof.

[0210] As the material for the vibration absorbing material 86, in addition to the above, specifically, for example, "3M Flame Retardant VHB Structural Bonding Tape Y-4545-07" manufactured by 3M Japan Ltd. can be used.

[0211] The 3M Flame-Retardant VHB Structural Bonding Tape Y-4545-07 includes a double-sided tape with an acrylic foam substrate and adhesive on both surfaces of the substrate. The acrylic foam substrate provides sufficient vibration absorption.

[0212] In this embodiment, the vibration absorbing material 86 preferably has a vibration transmissibility of 0.2 or more and 0.5 or less.

[0213] Here, the vibration transmissibility refers to the ratio of the vibration generated by the machine 1 to the vibration transmitted to the table 3 when the machine 1 is placed on the table 3 via the vibration absorbing material 2 (see Figure 6).

[0214] Here, if the vibration force generated by the machine is F0(N) and the vibration force transmitted to the table is F(N), then Vibration transmissibility = F / F0.

[0215] In this embodiment, the vibration transmissibility of the vibration absorbing material 86 is 0.2 or more and 0.5 or less. In this case, if the vibration transmissibility of the vibration absorbing material 86 exceeds 0.5, the vibrations from the transparent laminate film 30 cannot be reliably absorbed, and the vibrations from the transparent laminate film 30 will be transmitted to the film support portion 70.

[0216] On the other hand, vibration absorbing material 86 with a vibration transmissibility of less than 0.2 can effectively absorb vibrations from transparent laminate film 30, but it is becoming difficult to obtain materials with such good vibration transmissibility on the market.

[0217] For this reason, the vibration absorbing material 86 has a vibration transmissibility of 0.2 or more and 0.5 or less. [Explanation of symbols]

[0218] 10 Partitions 30 Transparent laminated film 30a 1 side 30b 2 sides 301 page 1 302 2 sides 40 1 side anti-reflection layer 50 2-sided anti-reflection layer 61 1-sided protective film 62 2-sided protective film 70 Film support part 71 Part 1 72 Part 2 86 Vibration absorber 90 Stand 95 Box 96 Control Unit 97 Reference Microphone 98 Operating equipment 100 Noise Sources 110 Sound Level Meter G horizontal plane T desk

Claims

1. In the low-reflection transparent film device with acoustic function, a transparent film having a first surface and a second surface; a film support frame that supports a peripheral edge of the transparent film, the transparent film includes a first anti-reflection surface constituting the first surface and a second anti-reflection surface constituting the second surface, a vibrator is provided on the transparent film, and the vibrator generates sound from the transparent film; The transparent film has a peripheral edge attached to the film support frame via a vibration absorbing material.

2. 2. The acoustic function-equipped low-reflection transparent film device according to claim 1, wherein the film support frame and the transparent film do not overlap when the transparent film is viewed in a direction perpendicular to the first surface of the transparent film.

3. 3. A low-reflection transparent film device with acoustic function as described in claim 2, wherein when the transparent film is viewed from a direction perpendicular to the first surface of the transparent film, the transparent film and the vibration absorbing material overlap, and the vibration absorbing material and the film support frame overlap.

4. 2. The acoustically-equipped low-reflection transparent film device according to claim 1, wherein the vibration-absorbing material extends continuously around the entire periphery of the transparent film.

5. 2. The acoustically-equipped low-reflection transparent film device according to claim 1, wherein the vibration-absorbing material is attached intermittently around the entire periphery of the transparent film.

6. 2. The acoustically-equipped low-reflection transparent film device according to claim 1, wherein the vibration absorbing material has a vibration transmissibility of 0.2 or more and 0.5 or less.

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