Airborne imaging device and stack

Abstract

The present application provides an aerial imaging device 10a, 10b, which has a display part 1, a light-transmissive imaging part 2 and an antistatic layer 3, the display part 1 has a display surface and emits light from the display surface, the light-transmissive imaging part 2 is arranged on the display surface side of the display part 1 and transmits the light, and further images on the surface side opposite to the display part, the antistatic layer 3 is laminated on the surface side of the display part 1 of the light-transmissive imaging part 2 or the surface side opposite to the display part 1 of the light-transmissive imaging part 2, and contains an antistatic agent. The aerial imaging device 10a, 10b has excellent antistatic property and excellent visibility.

Description

Technical Field

[0001] The present invention relates to an aerial imaging device and a laminate for forming the aerial imaging device. Background Technology

[0002] Aerial images are formed by reflecting and refracting light emitted from a light source using optical elements, thus creating an image at any location in space. Since no screen or monitor is placed at the location where the aerial image is displayed, the observer experiences an incredible sensation. Therefore, in recent years, aerial images have been fully utilized in various applications, such as virtual reality.

[0003] For example, Patent Document 1 discloses an aerial imaging device having at least a display section and a light-transmitting imaging section, wherein the image (real image) displayed on the display section is displayed as an aerial image mainly through the function of the light-transmitting imaging section. Existing technical documents Patent documents

[0004] Patent Document 1: Japanese Patent Application Publication No. 2020-060752 Summary of the Invention (a) Technical problems to be solved

[0005] Aerial imaging devices can sometimes generate static electricity due to surrounding conditions or user contact, becoming charged. If an aerial imaging device is charged, it may cause discomfort to the user or lead to damage or malfunction. Furthermore, when dust or other contaminants adhere to the exposed surface of the aerial imaging device (especially the side opposite the display section of the light-transmitting imaging unit), the visibility of the aerial image may deteriorate.

[0006] The present invention was implemented in view of the above-mentioned actual situation, with the primary objective of providing an aerial imaging device having excellent antistatic properties and excellent visibility, and a laminate for forming the aerial imaging device.

[0007] Furthermore, aerial imaging devices typically house both the display unit and the light-transmitting imaging unit within a frame. In this case, one side of the light-transmitting imaging unit is exposed outside the aerial imaging device, making it visible to the user. Therefore, if the frame and the light-transmitting imaging unit have different appearances, the user may get the impression of an appearance mismatch.

[0008] The present invention was implemented in view of the above-mentioned actual situation, with the second objective of providing an aerial imaging device with excellent appearance coordination and a laminate for forming the aerial imaging device.

[0009] Furthermore, when the aerial imaging device is activated, unexpected images known as ghosting sometimes appear alongside the aerial images. Ghosting is unintentional and does not accurately reflect the real image. Moreover, ghosting can sometimes overlap with the aerial images, making it difficult to observe them properly.

[0010] From the perspective of suppressing the occurrence of ghosting, the inventors of this application have discovered that by providing a light diffusion control unit in an aerial imaging device that diffuses or transmits light according to the incident angle of the light, the occurrence of ghosting can be effectively suppressed. Specifically, it has been found that by providing the aforementioned light diffusion control unit on the display side surface of the light-transmitting imaging unit, the occurrence of ghosting can be effectively suppressed.

[0011] Furthermore, for aerial imaging devices, while viewing the aerial images, viewers may sometimes see interference light caused by external light sources. For example, when an aerial imaging device is placed under a fluorescent lamp, viewers will see interference light corresponding to that fluorescent lamp, thus hindering their viewing of the aerial images.

[0012] Here, the interfering light is not merely surface reflection from the translucent imaging element, but rather light that penetrates into the translucent imaging element and returns to the observer's side. Because diffraction is accompanied by color cracking, visibility is significantly reduced compared to the reflection from a typical external light source.

[0013] Since the aerial imaging device is designed for use in places with many external light sources, such as convenience stores, supermarkets, and cars, it is necessary to suppress the influence of the aforementioned interfering light.

[0014] The inventors of this application have discovered that the aforementioned light diffusion control unit is effective from the perspective of suppressing the generation of interfering light. Specifically, it has been found that by providing the aforementioned light diffusion control unit on the surface of the light-transmitting imaging section opposite to the display section, the generation of interfering light can be effectively suppressed.

[0015] Generally, aerial imaging devices are shaped to house the aforementioned display unit, light-transmitting imaging unit, etc., within a frame. In this case, parts of the light-transmitting imaging unit and the laminated body composed of the light-transmitting imaging unit are exposed to the outside of the aerial imaging device, making them susceptible to external influences. In particular, when the aerial imaging device is placed outdoors, the aforementioned laminated body is exposed to sunlight.

[0016] The inventors of this application have discovered that the light diffusion control unit is prone to yellowing and other degradation when exposed to sunlight or other light sources for extended periods. This light degradation is a major cause of impaired visibility in aerial images.

[0017] The present invention was implemented in view of the above-mentioned actual situation, with the third objective of providing an aerial imaging device with excellent weather resistance and capable of viewing aerial images well, and a laminate for forming the aerial imaging device. (II) Technical Solution

[0018] To achieve the above objectives, firstly, the present invention provides an aerial imaging device comprising: a display unit, a light-transmitting imaging unit, and a functional layer. The display unit has a display surface and emits light from the display surface. The light-transmitting imaging unit is disposed on the display surface side of the display unit and transmits the light, thereby forming an image at a position opposite to the display unit. The functional layer is stacked on the display surface side of the light-transmitting imaging unit or on the opposite surface side of the light-transmitting imaging unit. The aerial imaging device is characterized in that the functional layer is any one of an antistatic layer containing an antistatic agent, a coloring layer containing a coloring component, and a light diffusion control unit. When the functional layer is the coloring layer, the stack of the light-transmitting imaging unit and the coloring layer relative to a black plate is determined by CIE1976L. a b The color difference ΔE specified by the color system When the light transmittance of the laminate is 20% or less and the total light transmittance of the laminate is 10% or more and 100% or less, and the functional layer is the light diffusion control unit, the light diffusion control unit diffuses or transmits light incident into the light diffusion control unit according to its incident angle, and has a regular internal structure in the shape of louvers. The regular internal structure in the shape of louvers has multiple plate-shaped regions with relatively high refractive indices in regions with relatively low refractive indices, and the aerial imaging device further has a weather-resistant layer containing an ultraviolet absorber, or the light diffusion control unit contains an ultraviolet absorber (Invention 1).

[0019] In the above invention (Invention 1), preferably, the functional layer is the antistatic layer, and the antistatic layer is at least one of the following: a coating containing the antistatic agent, an adhesive layer containing the antistatic agent, a substrate containing the antistatic agent, and a light diffusion control section containing the antistatic agent. The light diffusion control section diffuses or transmits light incident on the light diffusion control section according to its incident angle, and has a regular internal structure in the shape of louvers. The regular internal structure in the shape of louvers has a plurality of plate-shaped regions with relatively high refractive index in regions with relatively low refractive index (Invention 2).

[0020] In the above inventions (Inventions 1 and 2), preferably, the functional layer is the antistatic layer, and the display unit is arranged with the light-transmitting imaging unit and the antistatic layer in such a way that the display surface and the light-transmitting imaging unit are not parallel on one side (Invention 3).

[0021] In the above invention (Invention 2), preferably: the functional layer is the antistatic layer, the antistatic layer is the light diffusion control part, and when the direction perpendicular to the long side direction of the plate-shaped region and existing in the plane of the light diffusion control part opposite to the light-transmitting imaging part is set as the first direction, each of the plate-shaped regions is inclined in the first direction within the light diffusion control part (Invention 4).

[0022] In the above invention (Invention 1), preferably, the functional layer is the coloring layer, and the coloring layer is an adhesive layer containing the coloring component (Invention 5).

[0023] In the above invention (Invention 1), preferably: the functional layer is the coloring layer, the aerial imaging device includes a light diffusion control unit, the light diffusion control unit is stacked on the side opposite to the display unit of the light-transmitting imaging unit or on the side of the display unit of the light-transmitting imaging unit, the light diffusion control unit causes light incident into the light diffusion control unit to diffuse or transmit according to its incident angle, and has a regular internal structure in the shape of louvers, the regular internal structure in the shape of louvers having a plurality of plate-shaped regions with relatively high refractive index in the region with relatively low refractive index (Invention 6).

[0024] In the above invention (Invention 6), it is preferable that the light diffusion control unit contains a coloring component, and the aerial imaging device includes the light diffusion control unit as the coloring layer (Invention 7).

[0025] In the above invention (Invention 1), preferably, the functional layer is the coloring layer, and the display unit is arranged on the light-transmitting imaging unit in such a way that the display surface and the light-transmitting imaging unit are not parallel on one side (Invention 8).

[0026] In the above invention (Invention 6), it is preferable that when the direction perpendicular to the long side direction of the plate-shaped region and existing in the plane opposite to the light-transmitting imaging region of the light diffusion control section is set as the first direction, each of the plate-shaped regions is inclined in the first direction within the light diffusion control section (Invention 9).

[0027] In the above invention (Invention 1), preferably, the functional layer is the light diffusion control unit, and the weather-resistant layer is disposed at at least one position on the surface of the light-transmitting imaging unit opposite to the light diffusion control unit, the surface of the light diffusion control unit opposite to the light-transmitting imaging unit, and between the light-transmitting imaging unit and the light diffusion control unit (Invention 10).

[0028] In the above invention (Invention 1), preferably, the functional layer is the light diffusion control part, and the weather-resistant layer is at least one of the following: a coating containing the ultraviolet absorber, an adhesive layer containing the ultraviolet absorber, an adhesive layer containing the ultraviolet absorber, and a substrate containing the ultraviolet absorber (Invention 11).

[0029] In the above invention (Invention 1), preferably, the functional layer is the light diffusion control unit, and the display unit is arranged with the light diffusion control unit and the light transmission imaging unit in such a way that the display surface and the surface of the light diffusion control unit opposite to the light transmission imaging unit are not parallel (Invention 12).

[0030] In the above invention (Invention 1), preferably, the functional layer is the light diffusion control unit, and when the direction perpendicular to the long side direction of the plate-shaped region and existing in the plane of the light diffusion control unit opposite to the light-transmitting imaging unit is set as the first direction, each of the plate-shaped regions is inclined in the first direction within the light diffusion control unit (Invention 13).

[0031] In the above inventions (Inventions 1 to 13), it is preferable that the light-transmitting imaging unit includes a retrotransmission optical element that allows incident light to be transmitted in reverse (Invention 14).

[0032] In the above invention (Invention 14), preferably, the retrotransmission optical element is an element formed by stacking two layers having multiple reflective surfaces, wherein in each of the two layers, the multiple reflective surfaces are perpendicular to one side of the retrotransmission optical element and arranged at a predetermined interval from each other, and the two layers are stacked in such a way that the reflective surface of one layer is orthogonal to the reflective surface of the other layer (Invention 15).

[0033] Secondly, the present invention provides a laminate comprising a light-transmitting imaging portion and a functional layer. The light-transmitting imaging portion images light incident from one side onto a position on the other side. The functional layer is laminated on one side of the light-transmitting imaging portion. The laminate is characterized in that the functional layer is any one of an antistatic layer containing an antistatic agent, a coloring layer containing a coloring component, and a light diffusion control portion. When the functional layer is the coloring layer, the laminate of the light-transmitting imaging portion and the coloring layer relative to a black plate is defined by CIE1976L. a b The color difference ΔE specified by the color system When the light transmittance of the laminate is 20% or less and the total light transmittance of the laminate is 10% or more and 100% or less, and the functional layer is the light diffusion control unit, the light diffusion control unit diffuses or transmits light incident on the light diffusion control unit according to its incident angle, and has a regular internal structure in the shape of louvers. The regular internal structure in the shape of louvers has multiple plate-shaped regions with relatively high refractive indices in regions with relatively low refractive indices, and the laminate further has a weather-resistant layer containing an ultraviolet absorber, or the light diffusion control unit contains an ultraviolet absorber (Invention 16).

[0034] In the above invention (Invention 16), preferably, the functional layer is the antistatic layer, and the antistatic layer is at least one of the following: a coating containing the antistatic agent, an adhesive layer containing the antistatic agent, a substrate containing the antistatic agent, and a light diffusion control section containing the antistatic agent. The light diffusion control section diffuses or transmits light incident on the light diffusion control section according to its incident angle, and has a regular internal structure in the shape of louvers. The regular internal structure in the shape of louvers has a plurality of plate-shaped regions with relatively high refractive index in regions with relatively low refractive index (Invention 17).

[0035] In the above invention (Invention 16), preferably, the functional layer is the coloring layer, and the coloring layer is an adhesive layer containing the coloring component (Invention 18).

[0036] In the above invention (Invention 16), preferably: the functional layer is the coloring layer, the laminate has a light diffusion control part, the light diffusion control part is laminated on any side of the light-transmitting imaging part, the light diffusion control part causes light incident into the light diffusion control part to diffuse or transmit according to its incident angle, and has a regular internal structure in the shape of louvers, the regular internal structure in the shape of louvers has a plurality of plate-shaped regions with relatively high refractive index in the region with relatively low refractive index (Invention 19).

[0037] In the above invention (Invention 19), preferably: the functional layer is the coloring layer, the light diffusion control part contains a coloring component, and the laminate has the light diffusion control part as the coloring layer (Invention 20). (III) Beneficial Effects

[0038] First, the aerial imaging device of the present invention has excellent antistatic properties and excellent visibility. Furthermore, the above-mentioned aerial imaging device can be formed using the laminated body according to the present invention.

[0039] Second, the aerial imaging device of the present invention has excellent aesthetic harmony. Furthermore, the above-described aerial imaging device can be formed using the laminated body according to the present invention.

[0040] Third, the aerial imaging device of the present invention has excellent weather resistance and can effectively view aerial images. Furthermore, the above-described aerial imaging device can be formed using the laminated body according to the present invention. Attached Figure Description

[0041] Figure 1 A cross-sectional view illustrating an example of an aerial imaging apparatus according to a first embodiment of the present invention is shown for illustrative purposes. Figure 2 A cross-sectional view illustrating other examples of the aerial imaging apparatus of the first embodiment of the present invention. Figure 3 A perspective view illustrating the internal structure of the light diffusion control unit in the first embodiment is shown. Figure 4 A cross-sectional view illustrating an example of an aerial imaging apparatus according to a second embodiment of the present invention is shown for illustrative purposes. Figure 5 A cross-sectional view illustrating other examples of an aerial imaging apparatus according to a second embodiment of the present invention is shown for illustrative purposes. Figure 6 A perspective view illustrating the internal structure of the light diffusion control unit in the second embodiment is shown. Figure 7 A cross-sectional view illustrating an example of an aerial imaging apparatus according to a third embodiment of the present invention is shown for illustrative purposes. Figure 8 A cross-sectional view illustrating other examples of an aerial imaging apparatus according to a third embodiment of the present invention. Figure 9 A cross-sectional view is shown for illustrative purposes of another example of an aerial imaging device according to a third embodiment of the present invention. Figure 10 A perspective view illustrating the internal structure of the light diffusion control unit in the third embodiment is shown. Figure 11 A diagram illustrating the relationship between the optical characteristics of the light diffusion control unit in the third embodiment and the light that forms aerial images and ghosting. Figure 12 A diagram illustrating the layer structure of a laminate fabricated according to an embodiment of the third implementation. Detailed Implementation

[0042] The following describes an embodiment of the present invention. The aerial imaging device of this embodiment includes: a display unit, a light-transmitting imaging unit, and a functional layer. The display unit has a display surface and emits light from the display surface. The light-transmitting imaging unit is disposed on the display surface side of the display unit and transmits the light, thereby forming an image at a position on the side opposite to the display unit. The functional layer is stacked on the side of the light-transmitting imaging unit on the display surface side or on the side of the light-transmitting imaging unit opposite to the display unit.

[0043] Furthermore, the aforementioned functional layer is any one of an antistatic layer containing an antistatic agent, a coloring layer containing a coloring component, and a light diffusion control section.

[0044] Furthermore, when the aforementioned functional layer is the coloring layer, the laminate of the aforementioned light-transmitting imaging portion and the aforementioned coloring layer relative to the black plate is determined by CIE1976L. a b The color difference ΔE specified by the color system The transmittance is 20 or less, and the total transmittance of the above-mentioned laminate is 10% or more and 100% or less.

[0045] Furthermore, when the aforementioned functional layer is the aforementioned light diffusion control unit, the aforementioned light diffusion control unit causes light incident into the aforementioned light diffusion control unit to diffuse or transmit according to its incident angle, and has a regular internal structure in the shape of louvers. The regular internal structure in the shape of louvers has multiple plate-shaped regions with relatively high refractive indices in regions with relatively low refractive indices, and the aforementioned aerial imaging device further has a weather-resistant layer containing an ultraviolet absorber, or the aforementioned light diffusion control unit contains an ultraviolet absorber.

[0046] Furthermore, the stacked body of this embodiment is a structure that omits the display section from the aforementioned aerial imaging device.

[0047] In this specification, the first embodiment is described as having an antistatic layer as the functional layer, the second embodiment as having a coloring layer as the functional layer, and the third embodiment as having a light diffusion control unit as the functional layer. The descriptions are as follows.

[0048] [Aerial Imaging Device of the First Implementation Scheme] Figure 1 and Figure 2 A cross-sectional view is shown to schematically illustrate an example of an aerial imaging device according to the first embodiment. For example... Figure 1 and Figure 2As shown, the aerial imaging devices 10a and 10b of the first embodiment include: a display unit 1 having a display surface and emitting light from the display surface; a light-transmitting imaging unit 2 disposed on the display surface side of the display unit 1 and transmitting the light therefrom, thereby forming an image at a position on the surface side opposite to the display unit 1; and an antistatic layer 3 containing an antistatic agent.

[0049] In particular, for Figure 1 The aerial imaging device 10a shown has an antistatic layer 3 laminated on the side of the light-transmitting imaging section 2 opposite to the display section 1. Furthermore, for Figure 2 The aerial imaging device 10b shown has an antistatic layer 3 stacked on the side of the display section 1 of the light-transmitting imaging section 2.

[0050] The aerial imaging devices 10a and 10b of the first embodiment exhibit excellent antistatic properties by having an antistatic layer 3 containing an antistatic agent, as described above. As a result, the aerial imaging devices 10a and 10b are less prone to becoming charged, which can suppress discomfort to the user and reduce the risk of misoperation and malfunction due to charging. Furthermore, the aerial imaging devices 10a and 10b (especially the side opposite to the display section of the light-transmitting imaging section) are less prone to attracting dust, which ensures a clear light path from the display surface, resulting in good display of aerial images.

[0051] 1. Display section The display unit 1 of the aerial imaging devices 10a and 10b constituting the first embodiment is not particularly limited as long as it has a display surface that can display images and emit light to the light-transmitting imaging unit 2 and the antistatic layer 3. For example, liquid crystal display (LCD), light-emitting diode display (LED), organic electroluminescent display (organic EL), etc., can be used as the display unit 1.

[0052] Furthermore, the positional relationship between the display unit 1, the light-transmitting imaging unit 2, and the antistatic layer 3 is not particularly limited. Preferably, as follows... Figure 1 and Figure 2 As shown, the display unit 1 and the light-transmitting imaging unit 2 are sufficiently separated, with a space between them. Furthermore, it is preferable to arrange the display unit 1 such that the display surface of the display unit 1 is not parallel to one side of the light-transmitting imaging unit 2. This positional relationship allows for better display of aerial images.

[0053] 2. Light-transmitting imaging unit The light-transmitting imaging unit 2 constituting the aerial imaging devices 10a and 10b of the first embodiment is not particularly limited as long as it can transmit light from the display unit 1 and image the aerial image on a predetermined aerial image observation surface. Examples of the aforementioned light-transmitting imaging unit 2 include retro-transmission optical elements that transmit incident light backwards. Furthermore, "aerial image observation surface" refers to... Figures 1-2 , Figures 4-5 and Figures 7-9 The face at the location indicated by mark "4" in the diagram. Furthermore, Figures 1-2 , Figures 4-5 and Figures 7-9 In the diagram, the point marked "5" is the "observation point".

[0054] While conventionally known retrotransmission optical elements can be used as the aforementioned retrotransmission optical elements, from the perspective of easily achieving good imaging of aerial images, retrotransmission optical elements having a two-sided orthogonal reflector array or a dihedral reflector array structure are preferred, and retrotransmission optical elements having a two-sided orthogonal reflector array are more preferred. For example, the retrotransmission optical element with a two-sided orthogonal reflector array described in Patent No. 5085631 can be cited as an example of a retrotransmission optical element with a two-sided orthogonal reflector array. That is, as a retrotransmission optical element with a two-sided orthogonal reflector array, it is preferable to use a retrotransmission optical element composed of two layers having multiple reflective surfaces stacked together. In particular, in this retrotransmission optical element, it is preferable that in each of the two layers, the multiple reflective surfaces are arranged perpendicular to one surface of the retrotransmission optical element and spaced apart from each other by a predetermined interval, and that the two layers are stacked such that the reflective surface of one layer is orthogonal to the reflective surface of the other layer. As a retrotransmission optical element with a dihedral reflector array structure, the retrotransmission optical element with a dihedral reflector array structure described in international publication WO2007 / 116639 can be used.

[0055] The thickness of the light-transmitting imaging portion 2 is preferably 0.1 to 20 mm, more preferably 0.5 to 15 mm, particularly preferably 1 to 12 mm, further preferably 2 to 10 mm, and especially preferably 4 to 8 mm. By keeping the thickness of the light-transmitting imaging portion 2 within the above range, the aerial imaging devices 10a and 10b of the first embodiment can more easily display aerial images more brightly.

[0056] 3. Antistatic layer In the first embodiment, the antistatic layer 3 is not limited in material or composition as long as it contains an antistatic agent. For example, the antistatic layer 3 is preferably at least one of a coating containing an antistatic agent, an adhesive layer containing an antistatic agent, a substrate containing an antistatic agent, and a light diffusion control section containing an antistatic agent. In addition, from the perspective of SDGs (Sustainable Development Goals), materials with high bio-based content, recyclable or reusable materials, or recycled or reusable materials can be used as the materials constituting the antistatic layer 3.

[0057] (1) Antistatic agent Examples of antistatic agents include conductive polymers, conductive fillers, anionic or cationic compounds, and compounds whose main chain or side chain has quaternary ammonium salt groups.

[0058] Examples of conductive polymers include polythiophene-based, polyaniline-based, and polypyrrole-based conductive polymers. Examples of polythiophene-based conductive polymers include polythiophene, poly(3-alkylthiophene), poly(3-thiophene-β-ethanesulfonic acid), mixtures of polyalkylene dioxythiophene and polystyrene sulfonate, etc. Examples of polyalkylene dioxythiophene include polyethylene dioxythiophene, polypropylene dioxythiophene, poly(ethylene / propylene) dioxythiophene, etc. Examples of polyaniline-based conductive polymers include polyaniline, polymethylaniline, polymethoxyaniline, etc. Examples of polypyrrole-based conductive polymers include polypyrrole, poly3-methylpyrrole, poly3-octylpyrrole, etc. These conductive polymer compounds can be used alone or in combination of two or more. Furthermore, these conductive polymers are preferably used in aqueous solution form, dispersed in water.

[0059] Examples of conductive fillers include particles of gold, silver, copper, nickel, aluminum, stainless steel, carbon, conductive ceramics, tin oxide, antimony tin oxide (ATO), indium tin oxide (ITO), zinc oxide, and antimony pentoxide. These conductive fillers can be used alone or in combination of two or more.

[0060] The average particle size of the conductive filler is preferably 1 to 1000 nm, more preferably 10 to 500 nm, particularly more preferably 20 to 200 nm, and even more preferably 30 to 100 nm, from the perspective of facilitating the formation of the desired antistatic layer.

[0061] Examples of anionic and cationic compounds include ionic liquids, ionic solids, anionic surfactants, alkali metal salts, cationic surfactants, and nonionic surfactants. Examples of ionic liquids and ionic solids include nitrogen-containing onium salts, sulfur-containing onium salts, and phosphorus-containing onium salts. Furthermore, examples of alkali metal salts include lithium salts and potassium salts. These compounds can be used alone or in combination of two or more.

[0062] Examples of compounds containing quaternary ammonium salt groups include pyrrolidine rings, quaternary ammonium compounds of alkylamines and their copolymers with acrylic acid or methacrylic acid, quaternary ammonium compounds of N-alkylaminoacrylamide, vinylbenzyltrimethylammonium salt, and 2-hydroxy-3-methacryloyloxypropyltrimethylammonium salt. These compounds containing quaternary ammonium salt groups can be used alone or in combination of two or more.

[0063] It is desirable that the compounds containing quaternary ammonium salt groups described above are polymeric compounds. The number-average molecular weight of the compounds containing quaternary ammonium salt groups is preferably 1000 or more, particularly preferably 2000 or more, and even more preferably 5000 or more. Furthermore, regarding the upper limit of this number-average molecular weight, from the perspective of preventing the viscosity of the coating liquid containing conductive materials from becoming excessively high, the number-average molecular weight is preferably 500,000 or less. Additionally, the number-average molecular weight in this specification is a value converted from standard polystyrene determined by gel permeation chromatography (GPC).

[0064] (2) Coating When the antistatic layer 3 is a coating, the coating is preferably as follows: Figure 1 As shown, the coating is stacked on the side of the light-transmitting imaging section 2 opposite to the display section 1, and serves to protect the surface of the light-transmitting imaging section 2. Furthermore, the coating can be formed on a substrate; in this case, it can be a coating film having the coating and the substrate stacked on the light-transmitting imaging section 2. The coating serving as the antistatic layer 3 can also be composed of multiple layers.

[0065] The coating is preferably formed by curing a coating composition containing active energy ray curable components, antistatic agents and other additives.

[0066] (2-1) Active energy ray solidification components As a component for active energy radiation curing, preferably include multifunctional (meth)acrylate monomers, (meth)acrylate prepolymers, and active energy radiation curable polymers. Among these, multifunctional (meth)acrylate monomers or (meth)acrylate prepolymers are more preferred. Multifunctional (meth)acrylate monomers and (meth)acrylate prepolymers can be used individually or simultaneously. Furthermore, in this specification, (meth)acrylate refers to both acrylates and methacrylates. Other similar terms also apply. Furthermore, "polymer" also includes the concept of "copolymer." Other similar terms also apply.

[0067] Examples of multifunctional (meth)acrylate monomers include, for example, 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate with hydroxypentanoic acid, dicyclopentyl di(meth)acrylate, caprolactone-modified dicyclopentenyl di(meth)acrylate, ethylene oxide-modified di(meth)acrylate phosphate, allylated cyclohexyl di(meth)acrylate, and isocyanurate di(meth)acrylate. Multifunctional (meth)acrylates include trimethylolpropane tri(meth)acrylate, dipentaerythritol tri(meth)acrylate, propionic acid-modified dipentaerythritol tri(meth)acrylate, pentaerythritol tri(meth)acrylate, propylene oxide-modified trimethylolpropane tri(meth)acrylate, tris(acryloyloxyethyl)isocyanurate, propionic acid-modified dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, ethylene oxide-modified dipentaerythritol hexa(meth)acrylate, and caprolactone-modified dipentaerythritol hexa(meth)acrylate. These multifunctional (meth)acrylate monomers can be used alone or in combination of two or more.

[0068] Examples of (meth)acrylate prepolymers include, for example, polyester acrylate prepolymers, epoxy acrylate prepolymers, urethane acrylate prepolymers, and polyol acrylate prepolymers.

[0069] As a polyester acrylate prepolymer, it can be obtained, for example, by esterifying the hydroxyl groups of a polyester oligomer with hydroxyl groups at both ends obtained by condensation of a polycarboxylic acid and a polyol with (meth)acrylic acid, or by esterifying the terminal hydroxyl groups of an oligomer obtained by adding an epoxide to a polycarboxylic acid with (meth)acrylic acid.

[0070] As an epoxy acrylate prepolymer, it can be obtained, for example, by reacting (meth)acrylic acid with the epoxy ring of a low molecular weight bisphenol type epoxy resin or phenolic varnish type epoxy resin to carry out esterification.

[0071] As a urethane acrylate prepolymer, it can be obtained, for example, by esterifying a polyurethane oligomer obtained by reacting a polyether polyol, a polyester polyol, and a polyisocyanate with (meth)acrylic acid.

[0072] As a polyol acrylate prepolymer, it can be obtained, for example, by esterifying the hydroxyl groups of a polyether polyol with (meth)acrylic acid.

[0073] Furthermore, an organic-inorganic mixed resin is preferably used as the active energy ray curing component. Examples of preferred organic-inorganic mixed resins include substances formed by bonding organic compounds with polymerizable unsaturated groups to inorganic particles such as silica via a silane coupling agent. This organic-inorganic mixed resin is preferably in the form of an organic sol (colloidal) (e.g., silica sol), and is preferably used in combination with the aforementioned active energy ray curing components such as multifunctional (meth)acrylate monomers. Additionally, the inorganic particles contained in the organic-inorganic mixed resin are not fillers as described later; they function as binders and can improve the hardness of the formed coating.

[0074] (2-2) Antistatic agent When the antistatic layer 3 is a coating, the aforementioned substances can be appropriately selected as the antistatic agent. The content of the antistatic agent in the coating composition is preferably 1 to 1000 parts by mass relative to 100 parts by mass of the active energy ray curing component, more preferably 10 to 800 parts by mass, particularly more preferably 15 to 600 parts by mass, and even more preferably 20 to 400 parts by mass. This makes it easier to achieve superior antistatic properties.

[0075] (2-3) Other additives In addition to the components described above, the coating composition in the first embodiment may also contain various additives. Examples of such additives include photopolymerization initiators, fillers, hollow silica microparticles, dispersants, surface conditioners, leveling agents, ultraviolet absorbers, antioxidants, light stabilizers, silane coupling agents, anti-aging agents, thermoplasticizers, colorants, infrared absorbers, surfactants, preservation stabilizers, plasticizers, lubricants, defoamers, organic fillers, wetting modifiers, coating modifiers, dispersants, etc.

[0076] In particular, from the perspective of efficiently carrying out the crosslinking reaction of the active energy ray curable components, the coating composition preferably contains a photopolymerization initiator. Examples of photopolymerization initiators include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropane-1-one, 1-hydroxycyclohexylphenyl ketone, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholino-propane-1-one, etc. 4-(2-hydroxyethoxy)phenyl-2-(hydroxy-2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4'-diethylaminobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tert-butylanthraquinone, 2-aminoanthraquinone, 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyl dimethyl ketal, acetophenone dimethyl ketal, p-dimethylaminobenzoate, etc. These photopolymerization initiators can be used alone or in combination of two or more.

[0077] The content of photopolymerization initiator in the coating composition is preferably 0.1 to 20 parts by mass relative to 100 parts by mass of the active energy ray curable component, more preferably 0.3 to 15 parts by mass, particularly preferably 0.5 to 10 parts by mass, and even more preferably 1 to 5 parts by mass. This allows for the acquisition of a coating with the desired hardness.

[0078] (2-4) Physical properties of the coating, etc. When the antistatic layer 3 is a coating, the surface resistivity of the side of the antistatic layer 3 opposite to the light-transmitting imaging part 2 is preferably 1.00 × 10⁻⁶. 13 Ω·□ -1 Hereinafter, 1.00 × 10 is preferred. 12 Ω·□ -1 The following is particularly preferred: 1.00 × 10 11 Ω·□ -1 Hereinafter, 6.00×10 is further preferred. 10 Ω·□ -1 The following is particularly preferred: 3.00 × 10 10 Ω·□ -1 Therefore, it is easy to achieve superior antistatic properties. Furthermore, the lower limit of the surface resistivity value mentioned above is not particularly limited; for example, it can be 1.0 × 10⁻⁶. 3 Ω·□ -1 The above, especially for 1.0×10 4 Ω·□ -1 The above can also be further expressed as 1.0 × 10. 5 Ω·□-1 The above details the method for determining the surface resistivity, as described in the experimental examples below.

[0079] When the antistatic layer 3 is a coating, the thickness of the coating is preferably 0.001 to 100 μm, more preferably 0.01 to 75 μm, particularly preferably 0.1 to 50 μm, further preferably 1 to 20 μm, and especially preferably 2 to 10 μm. This facilitates the achievement of superior antistatic properties. Furthermore, when the coating is composed of multiple layers as described above, the thickness referred to here is the total thickness of the multiple layers.

[0080] (3)Adhesive layer When the antistatic layer 3 is an adhesive layer, it is preferably used to ensure that the components constituting the aerial imaging devices 10a and 10b are tightly bonded to each other. For example, when the aerial imaging devices 10a and 10b have a light diffusion control unit, the adhesive layer of the antistatic layer 3 is preferably laminated between the light diffusion control unit and the light-transmitting imaging unit 2 and the two are tightly bonded and fixed.

[0081] There are no particular limitations on the adhesive used to form the adhesive layer described above. From the perspective of easily and clearly viewing aerial images, the adhesive is preferably transparent. Specific examples of the adhesive include acrylic adhesives, rubber adhesives, silicone adhesives, polyester adhesives, and urethane adhesives, but from the perspective of easily achieving the desired adhesion and transparency, acrylic adhesives are preferred. Furthermore, the adhesive can be a solvent-based adhesive, a solvent-free adhesive, or an emulsion-based adhesive.

[0082] The aforementioned acrylic adhesive is preferably composed of an adhesive composition formed from a (meth)acrylate polymer, a crosslinking agent, and an adhesive containing an antistatic agent.

[0083] As the aforementioned (meth)acrylate polymer and crosslinking agent, conventional (meth)acrylate polymers can be used, such as the crosslinking agents described in the second embodiment described later. One type can be used alone, or two or more types can be used in combination. The content of the crosslinking agent in the adhesive composition is preferably 0.01 to 10 parts by mass relative to 100 parts by mass of the (meth)acrylate polymer, more preferably 0.05 to 5 parts by mass, and particularly preferably 0.1 to 1 part by mass. Thus, an adhesive with desired cohesive strength and coating strength can be obtained.

[0084] When the antistatic layer 3 is an adhesive layer, the aforementioned antistatic agent can be appropriately selected as the antistatic agent. The content of the antistatic agent in the adhesive composition is preferably 1 to 2000 parts by weight relative to 100 parts by weight of the (meth)acrylate polymer, more preferably 10 to 1500 parts by weight, particularly preferably 15 to 1000 parts by weight, and even more preferably 20 to 500 parts by weight. This makes it easier to achieve superior antistatic properties.

[0085] Various additives commonly used in acrylic adhesives can be added to the adhesive composition as needed, such as ultraviolet absorbers, infrared absorbers, silane coupling agents, photopolymerization initiators, tackifiers, antioxidants, light stabilizers, deoxidizers, colorants, surfactants, softeners, fillers, refractive index modifiers, etc.

[0086] When the antistatic layer 3 is an adhesive layer, the thickness of the adhesive layer is preferably 1~1000μm, more preferably 5~800μm, and even more preferably 10~600μm. This makes it easier to achieve superior antistatic properties.

[0087] In addition, the adhesive layer can be formed and the adhesive composition can be prepared in the same manner as the adhesive layer in the second embodiment described later.

[0088] (4) Substrate When the antistatic layer 3 is a substrate, the substrate may, for example, be disposed on the outermost surface of the viewer side of the laminate composed of the light-transmitting imaging part 2, etc., and have the function of protecting the laminate, or it may also have the function of forming other components constituting the aerial imaging devices 10a and 10b.

[0089] The aforementioned substrate can be formed from a material containing a main agent and an antistatic agent. The main agent is not particularly limited, but is preferably a resin, and particularly preferably a transparent resin.

[0090] Examples of the aforementioned resins include polyesters such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate; polyolefins such as polyethylene and polypropylene; cellophane; diacetyl cellulose; triacetyl cellulose; acetyl cellulose butyrate; polyvinyl chloride; polyvinylidene chloride; polyvinyl alcohol; ethylene-vinyl acetate copolymer; polystyrene; polycarbonate; polymethylpentene; polysulfone; polyetheretherketone; polyethersulfone; polyetherimide; fluoropolymers; polyamides; acrylic resins; polyurethane resins; norbornene polymers; cyclic olefin polymers; cyclic conjugated diene polymers; and vinyl alicyclic hydrocarbon polymers. These resins can be used individually or in combination of two or more.

[0091] When the antistatic layer 3 is the substrate, the aforementioned antistatic agent can be appropriately selected as the antistatic agent. The content of the antistatic agent in the substrate is preferably 0.1 to 90% by mass, particularly preferably 0.5 to 85% by mass, and even more preferably 1 to 80% by mass. This makes it easier to achieve superior antistatic properties.

[0092] The thickness of the above-mentioned substrate is preferably 15~300μm, particularly preferably 30~200μm, and even more preferably 90~150μm.

[0093] (5) Light diffusion control unit When the antistatic layer 3 is a light diffusion control section, the light diffusion control section diffuses or transmits light incident into the light diffusion control section according to its incident angle, and has a regular internal structure in the shape of louvers. The regular internal structure in the shape of louvers has multiple plate-shaped regions with relatively high refractive index in the region with relatively low refractive index.

[0094] Figure 3 A perspective view illustrating the internal structure of the light diffusion control unit 3' is provided. Figure 3 As shown, the light diffusion control unit 3' has a regular internal structure resembling louvers, and this internal structure has multiple plate-shaped regions 31 with relatively high refractive indices in the region 32 with relatively low refractive index. By having this regular internal structure, the light diffusion control unit 3' can strongly diffuse incident light that is incident on the surface of the light diffusion control unit 3' within a predetermined incident angle range while being emitted at a predetermined aperture angle. On the other hand, in the case of incident light outside the aforementioned incident angle range, it can transmit without diffusion, or it can be emitted with weaker diffusion than the case of incident light within the incident angle range. Furthermore, the direction perpendicular to the long side direction of the plate-shaped regions 31 and existing on the surface of the light diffusion control unit 3' opposite to the light-transmitting imaging unit 2 (… Figure 3 In the diagram, the direction indicated by "D1" is set as the "first direction".

[0095] The aforementioned light diffusion control unit 3' can be as follows: Figure 1 The light-transmitting imaging unit 2 is positioned on the side opposite to the display unit 1. In this case, the light diffusion control unit 3' functions to diffuse the light incident from the external light source onto the light-transmitting imaging unit 2, thereby suppressing the influence of interfering light and allowing for good viewing of aerial images.

[0096] Furthermore, the aforementioned light diffusion control unit 3' can be as follows: Figure 2The light is provided on the display unit 1 side of the light-transmitting imaging unit 2. In this case, the light diffusion control unit 3' diffuses the light that forms ghosting (an image reflecting a real image that is displayed around the aerial image on the aerial image viewing surface 4 even if it is not displayed on the display surface of the display unit 1), but transmits the light that forms the aerial image with almost no diffusion. As a result, the generation of ghosting can be suppressed, and the aerial image can be viewed well.

[0097] The light diffusion control section 3' described above is not particularly limited as long as it has the regular internal structure resembling louvers. From the perspective of easily forming the aforementioned regular internal structure, the light diffusion control section 3' is preferably formed by curing a light diffusion control section containing a high refractive index component, a low refractive index component having a refractive index lower than that high refractive index component, and an antistatic agent. In particular, the high refractive index component and the low refractive index component preferably each have one or two polymerizable functional groups.

[0098] Materials commonly used in forming light diffusion control sections can be used as both high-refractive-index and low-refractive-index components. For example, the same material as that used in the light diffusion control section 7 of the third embodiment can be used as the material for the light diffusion control section comprising both high-refractive-index and low-refractive-index components.

[0099] When the antistatic layer 3 is a light diffusion control section 3', the aforementioned antistatic agent can be appropriately selected as the antistatic agent. The content of the antistatic agent in the composition for the light diffusion control section is preferably 1 to 1000 parts by mass relative to 100 parts by mass of the high refractive index component, more preferably 10 to 800 parts by mass, particularly preferably 15 to 600 parts by mass, and even more preferably 20 to 400 parts by mass. This makes it easier to achieve superior antistatic properties.

[0100] The method for forming the light diffusion control unit 3' is not particularly limited, and it can be formed by methods known in the past. For example, it can be formed in the same manner as the method for forming the light diffusion control unit 7 in the third embodiment.

[0101] In the light diffusion control unit 3', such as Figure 3 As shown, the preferred plate-shaped regions 31 are each tilted in the first direction D1 within the light diffusion control unit 3'. Therefore, the aerial imaging devices 10a and 10b of the first embodiment can easily suppress ghosting or interference light and can easily display aerial images more brightly.

[0102] When the plate-shaped region 31 is tilted as described above, the tilt angle relative to the thickness direction of the light diffusion control section 3' is preferably 0° to 30°, more preferably 1° to 20°, particularly preferably 2° to 15°, and even more preferably 3° to 10°. As a result, the aerial imaging devices 10a and 10b of the first embodiment can easily suppress the occurrence of ghosting or interfering light and can easily display aerial images more brightly.

[0103] The light diffusion control unit 3' can also have the following functions: Figure 3 Structures other than the regular internal structure shown. For example, the plate-shaped region 31 may also be bent midway in the thickness direction of the light diffusion control section 3'. Furthermore, the light diffusion control section 3' may be stacked with two or more layers of a regular internal structure formed by arranging the plate-shaped regions 31.

[0104] The thickness of the light diffusion control section 3' is preferably 1 to 500 μm, more preferably 10 to 400 μm, particularly preferably 50 to 300 μm, further preferably 75 to 250 μm, and especially preferably 100 to 200 μm. Therefore, the aerial imaging devices 10a and 10b of the first embodiment can easily achieve superior antistatic properties, easily suppress ghosting or interference light, and easily display aerial images more brightly.

[0105] 4. Other constituent elements The aerial imaging devices 10a and 10b of the first embodiment may also have multiple layers of antistatic layer 3. For example, antistatic layer 3 may be stacked on both sides of the light-transmitting imaging section 2.

[0106] In addition, the aerial imaging devices 10a and 10b of the first embodiment may also include at least one of the following: a coating layer, an adhesive layer, a substrate, and a light diffusion control unit that is not the antistatic layer 3 (which does not contain an antistatic agent).

[0107] Furthermore, the aerial imaging devices 10a and 10b of the first embodiment preferably include a frame for fixing and storing the display unit 1, the light-transmitting imaging unit 2, and the antistatic layer 3 in a predetermined position.

[0108] The material, shape, and size of the frame can be appropriately selected according to the application and purpose. In particular, the frame is preferably made of a light-shielding material, which can prevent light from the display unit 1 from accidentally leaking to the outside, and at the same time prevent external light from unintentionally entering the light path from the display unit 1 to the light-transmitting imaging unit 2.

[0109] 5. The positional relationship of each element In the case where the aerial imaging devices 10a and 10b of the first embodiment are equipped with a light diffusion control unit 3' as an antistatic layer 3, when it is envisioned Figure 3When the first direction, indicated by "D1", is considered as the first direction, and the direction parallel to the plane perpendicular to both the display surface of the display unit 1 and the single surface of the light diffusion control unit 3', and existing within the single surface of the light diffusion control unit 3', is conceived as the second direction, the acute angle formed by the first direction and the second direction is preferably 0° or more and 90° or less. Regardless of the acute angle, by considering the incident angle with respect to the light diffusion control unit 3' within the plane including D1 and perpendicular to the light diffusion control unit 3', the aerial imaging devices 10a and 10b of the first embodiment can easily suppress the occurrence of ghosting or interfering light, and can easily display aerial images more brightly.

[0110] Furthermore, when the aerial imaging devices 10a and 10b of the first embodiment have a light diffusion control unit 3' as an antistatic layer 3, and have the aforementioned retrotransmission optical element with a dihedral reflector array structure, or a retrotransmission optical element consisting of two layers having multiple reflective surfaces stacked together as a light-transmitting imaging unit 2, the following conditions are preferably met.

[0111] First, as a premise, imagine a plane F that is perpendicular to the two surfaces of the light-transmitting imaging section 2 (opposite to the light diffusion control section 3') and the display surface of the display section 1, and passes through the center point of the light-transmitting imaging section 2. Furthermore, the width of the light-transmitting imaging section 2 in the cross-section formed by cutting through the light-transmitting imaging section 2 with this plane F is defined as width W.

[0112] Furthermore, imagine an observation point existing within the aforementioned plane F that satisfies the following two conditions, A and B. (Condition A) When the angle formed by the line segment connecting the observation point and the center point and the surface of the light-transmitting imaging unit 2 opposite to the light diffusion control unit 3' is set as angle α, and the angle formed by the plane containing the display surface of the display unit 1 and the plane containing the surface of the light-transmitting imaging unit 2 opposite to the light diffusion control unit 3' is set as angle β, the total of angle α and angle β is 90°. (Condition B) The distance between the above observation point and the above center point is 1 to 10 times the width W.

[0113] Furthermore, as a supplement, condition A above means that the position of the observation point is determined based on the positional relationship between the display unit 1 and the light-transmitting imaging unit 2 in the aerial imaging devices 10a and 10b. For example, for aerial imaging devices 10a and 10b where the display unit 1 and the light-transmitting imaging unit 2 are set at an angle β of 45°, it means that the angle α of the observation point is 45°; for aerial imaging devices 10a and 10b where the angle β is 60°, the angle α of the observation point is 30°.

[0114] Furthermore, regarding condition B above, the statement "1 to 10 times the width W" means that the observation point only needs to satisfy the condition of any point within this range. In particular, condition B is preferably "the distance between the observation point and the center point is 3.5 times the width W".

[0115] Furthermore, when observing the aerial imaging devices 10a and 10b from this observation point, it is preferable that the elements of the aerial imaging devices 10a and 10b are configured such that the light diffusion control unit 3' simultaneously satisfies the following two conditions. (Condition 1) For light that is reflected in the two layers constituting the retrotransmission optical element from any point on the display unit 1 and reaches the observation point, the haze value is 60% or less. (Condition 2) For light that is irradiated from any point on the display unit 1 and reaches the observation point, the haze value is 60% or higher, and the light that is reflected only in one of the two layers constituting the retrotransmission optical element is reflected.

[0116] The aerial imaging devices 10a and 10b of the first embodiment, by satisfying the above conditions, can easily suppress the occurrence of ghosting or interfering light and can easily display aerial images more brightly.

[0117] Here, "reflection occurs in both layers of the two-layer system" or "reflection occurs only in one of the two layers" refers to reflection that signifies a change in the direction of travel, not physical reflection. Because parallel mirrors are arranged in each layer of a retrotransmission optical element formed by stacking two layers of layers with multiple reflective surfaces, the direction of travel changes during odd-numbered reflections and remains unchanged during even-numbered reflections. Therefore, "reflection occurs" in the above statement can be translated as "odd-numbered reflections occur, and the direction of travel changes."

[0118] 6. Manufacturing method of aerial imaging device The manufacturing method of the aerial imaging devices 10a and 10b in the first embodiment is not particularly limited. For example, after preparing the display unit 1, the light-transmitting imaging unit 2 and the antistatic layer 3 respectively, the display unit 1 can be set at a predetermined position in the frame, and a laminate of the light-transmitting imaging unit 2 and the antistatic layer 3 can be set, thereby obtaining the aerial imaging devices 10a and 10b.

[0119] 7. How to use the aerial imaging device The aerial imaging devices 10a and 10b of the first embodiment can be used as display devices for displaying arbitrary images, videos, etc. in the air. Their specific usage is not limited, and they can be used in the same manner as conventionally known display devices.

[0120] [Laminated structure of the first implementation scheme] The laminated body of the first embodiment is a structure in which the display unit 1 is omitted from the aerial imaging devices 10a and 10b. That is, the laminated body of the first embodiment includes: a light-transmitting imaging unit 2 that images light incident from one side of the surface onto the other side of the surface; and an antistatic layer 3 laminated on one side of the light-transmitting imaging unit 2 and containing an antistatic agent. Here, the details of the composition and structure of the light-transmitting imaging unit 2 and the antistatic layer 3 are as described above.

[0121] The laminated body of the first embodiment can be obtained by laminating the light-transmitting imaging unit 2 and the antistatic layer 3 after preparing them separately. Furthermore, the laminated body of the first embodiment can be used to form the aerial imaging devices 10a and 10b of the first embodiment. That is, the aerial imaging devices 10a and 10b of the first embodiment can be obtained by placing the display unit 1 at a predetermined position on the laminated body of the first embodiment.

[0122] [Aerial Imaging Device of the Second Implementation Scheme] Figure 4 and Figure 5 These are cross-sectional views schematically illustrating an example of an aerial imaging device according to the second embodiment. Figure 4 and Figure 5 As shown, the aerial imaging devices 10c and 10d of the second embodiment include: a display unit 1 having a display surface and emitting light from the display surface; a light-transmitting imaging unit 2 disposed on the display surface side of the display unit 1, transmitting the light and thus forming an image at a position opposite to the display unit 1; and a coloring layer 6 containing coloring components.

[0123] in particular, Figure 4 The aerial imaging device 10c shown has a configuration in which a coloring layer 6 is stacked on the side of the light-transmitting imaging section 2 opposite to the display section 1. Furthermore, Figure 2 The aerial imaging device 10d shown has a configuration in which a coloring layer 6 is stacked on the side of the display section 1 of the light-transmitting imaging section 2.

[0124] Furthermore, for the aerial imaging devices 10c and 10d in the second embodiment, the laminate of the light-transmitting imaging unit 2 and the coloring layer 6 relative to the black plate is determined by CIE1976L. a b The color difference ΔE specified by the color system The transmittance is below 20, and the total transmittance of the laminate is above 10% and below 100%.

[0125] The aerial imaging devices 10c and 10d in the second embodiment, as described above, include a coloring layer 6 containing coloring components, and satisfy the aforementioned color difference ΔE. Under the condition of total light transmittance, the portions of the laminated body exposed from the frame and the adjacent frame portions become visually similar, making it difficult for viewers to see the boundaries of these portions. Therefore, the aerial imaging devices 10c and 10d of the second embodiment exhibit excellent visual harmony. Furthermore, from the perspective of easily displaying even better visual harmony, such as... Figure 4 As shown, the coloring layer 6 is preferably disposed on the side of the light-transmitting imaging section 2 opposite to the display section 1 (viewer side).

[0126] For the aerial imaging devices 10c and 10d in the second embodiment, as described above, the aforementioned chromatic difference ΔE The value is below 20, but from the perspective of easily achieving better aesthetic harmony, this ΔE Preferably, it is 18.5 or less, more preferably 16 or less, particularly preferably 15 or less, and even more preferably 14.5 or less. Furthermore, this ΔE... The lower limit value is not particularly limited; for example, it can be 0 or higher. However, from the perspective of excellent appearance harmony and easy and bright viewing of aerial images, it is preferably 0.01 or higher, more preferably 0.1 or higher, particularly preferably 1.0 or higher, further preferably 4.0 or higher, and especially preferably 7.0 or higher. The above ΔE The details of the calculation method and the determination methods of the values ​​required for the calculation are described in the experimental examples below.

[0127] For the aerial imaging devices 10c and 10d in the second embodiment, the laminate of the light-transmitting imaging unit 2 and the coloring layer 6 relative to the black plate is determined by CIE1976L. a b The lightness L specified by the color system Preferably 1 to 90, more preferably 3 to 60, particularly preferably 6 to 30, further preferably 8 to 22, and especially preferably 9 to 17. Furthermore, relative to the black plate, according to CIE 1976L... a b The color a specified by the color system The absolute value is preferably -30 to 30, more preferably -20 to 20, particularly preferably -10 to 10, further preferably -5 to 5, and especially preferably -2 to 2. Furthermore, relative to the black plate, according to CIE 1976L... a b The color b specified in the color system The absolute value of ΔE is preferably -30 to 30, more preferably -20 to 20, particularly preferably -10 to 10, further preferably -6 to 6, and especially preferably -3 to 3. Therefore, the aforementioned ΔE is easily satisfied. The conditions. Additionally, brightness L. chromaticity a and chromaticity b The details of the respective determination methods are as described in the experiments below.

[0128] Furthermore, in the aerial imaging devices 10c and 10d of the second embodiment, as described above, the total light transmittance is preferably 10% or more and 100% or less. From the perspective of easily achieving better aesthetic harmony, the total light transmittance is preferably 91% or less, more preferably 85% or less, particularly preferably 75% or less, further preferably 65% ​​or less, and especially preferably 55% or less. From the perspective of having excellent aesthetic harmony and easily and brightly viewing the aerial image, it is preferably 20% or more, more preferably 25% or more, particularly preferably 30% or more, further preferably 35% or more, and especially preferably 40% or more. Additionally, details of the method for measuring the total light transmittance are described in the experimental examples below.

[0129] Furthermore, for the aerial imaging devices 10c and 10d in the second embodiment, the haze value of the laminate of the light-transmitting imaging unit 2 and the coloring layer 6 is preferably 0 to 99, more preferably 20 to 97, particularly preferably 40 to 95, further preferably 50 to 92, and especially preferably 60 to 90. This easily satisfies the condition for the total light transmittance. In addition, the detailed method for measuring the haze value is as described in the experiment below.

[0130] 1. Display section As the display unit 1 constituting the aerial imaging devices 10c and 10d in the second embodiment, the same display unit as that in the first embodiment can be used. Furthermore, the preferred positional relationship between the display unit 1, the light-transmitting imaging unit 2, and the coloring layer 6 is also the same as the positional relationship between the display unit 1, the light-transmitting imaging unit 2, and the antistatic layer 3 in the first embodiment.

[0131] 2. Light-transmitting imaging unit As the light-transmitting imaging unit 2 constituting the aerial imaging devices 10c and 10d in the second embodiment, the same light-transmitting imaging unit as the light-transmitting imaging unit 2 in the first embodiment can be used.

[0132] 3. Coloring layer In the second embodiment, the coloring layer 6 only needs to contain coloring components and be able to achieve the aforementioned color difference ΔE. Regarding the conditions of total light transmittance, there are no limitations on its materials and composition. For example, the coloring layer 6 is preferably at least one of a coating containing coloring components, an adhesive layer containing coloring components, a substrate containing coloring components, and a light diffusion control section containing coloring components. Among them, the coloring layer 6 is preferably at least one of an adhesive layer containing coloring components and a light diffusion control section containing coloring components. In addition, from the perspective of SDGs, materials with high bio-based content, recyclable or reusable materials, or recycled or reusable materials can be used as the materials constituting the coloring layer 6.

[0133] (1) Coloring components The coloring components mentioned above are not particularly limited; for example, they can be pigments or dyes. Pigments can be inorganic or organic. From the perspective of the durability of the coloring layer 6, inorganic pigments are preferred. The color of the colorant can be appropriately selected to match the color of the surrounding components that create a sense of unity, but dark colors such as black, brown, navy blue, purple, and blue are generally preferred, with black being particularly preferred.

[0134] Inorganic pigments include, for example, carbon black, cobalt pigments, iron pigments, chromium pigments, titanium pigments, vanadium pigments, zirconium pigments, molybdenum pigments, ruthenium pigments, platinum pigments, ITO (indium tin oxide) pigments, and ATO (antimony tin oxide) pigments.

[0135] As organic pigments and dyes, examples include, for instance, aminium pigments, anthocyanin pigments, croconium pigments, squarylium pigments, azulenium pigments, polymethystylene pigments, naphthoquinone pigments, pyranium pigments, phthalocyanine pigments, naphthocyanin pigments, naphtholactam pigments, azo pigments, condensed azo pigments, and indigo pigments. Perinone pigments, perylene pigments, dioxazine pigments, quinacridone pigments, isoindolineone pigments, quinolineone pigments, pyrrole pigments, thioindole pigments, metal complex pigments (metal complex salt dyes), dithiol metal complex pigments, indolephenol pigments, triarylmethane pigments, anthraquinone pigments, dioxazine pigments, naphthol pigments, methylimino pigments, benzimidazole pigments, pinantrone pigments, and threne pigments, etc.

[0136] Examples of black pigments include carbon black, copper oxide, iron oxide, manganese dioxide, aniline black, and activated carbon. Examples of black dyes include high-concentration plant-based dyes and azo dyes.

[0137] The pigments and dyes mentioned above can be appropriately mixed and used to obtain the target physical properties of the colored layer 6.

[0138] Among the aforementioned colorants, the one that most easily satisfies the color difference ΔE is... From the perspective of total light transmittance, at least one of carbon black, Nigrosine-based black dyes, and chromate-based black dyes is preferred. Furthermore, the carbon black may or may not undergo a specified surface treatment (e.g., solvation treatment).

[0139] Regarding the aforementioned coloring component, the average haze value of the liquid obtained by diluting the coloring component with ethyl acetate 10,000 times at a wavelength of 780 nm and at a wavelength of 380 nm, i.e., the average haze value, is preferably 0-60%, more preferably 0.01-45%, particularly preferably 0.5-30%, further preferably 1-20%, and especially preferably 1-10%. By using the aforementioned coloring component, it is easy to obtain a solution that satisfies the aforementioned color difference ΔE. A coloring layer with conditions for total light transmittance.

[0140] Furthermore, regarding the aforementioned coloring component, the difference between the haze value at 780 nm and the haze value at 380 nm obtained by diluting the coloring component with ethyl acetate 10,000 times is preferably 0 to 30 percentage points, more preferably 1 to 24 percentage points, particularly preferably 2 to 18 percentage points, further preferably 3 to 12 percentage points, and especially preferably 4 to 8 percentage points. By using the aforementioned coloring component, it is easy to obtain a solution that satisfies the aforementioned color difference ΔE. A coloring layer with conditions for total light transmittance.

[0141] The haze value of the liquid obtained by diluting the above-mentioned colorant with ethyl acetate 10,000 times at a wavelength of 780 nm is preferably 0 to 50%, more preferably 0.1 to 30%, particularly preferably 0.5 to 20%, and even more preferably 1 to 10%. Furthermore, the haze value of the liquid obtained by diluting the above-mentioned colorant with ethyl acetate 10,000 times at a wavelength of 380 nm is preferably 0 to 60%, more preferably 0.1 to 40%, particularly preferably 0.5 to 25%, and even more preferably 1 to 15%. These haze values ​​serve as indicators for discovering coloring components that readily satisfy the aforementioned average haze value and difference.

[0142] Furthermore, the standard deviation of the haze values ​​of the liquid obtained by diluting the above-mentioned colorant with ethyl acetate 10,000 times at 5 nm intervals in the 380 nm to 780 nm wavelength range (i.e., 380 nm, 385 nm, 390 nm...775 nm, 780 nm) is preferably 0 to 10, more preferably 0.1 to 7, particularly preferably 0.2 to 4, and even more preferably 0.3 to 2. By using the above-mentioned coloring components, it is easy to obtain the color difference ΔE that is required to satisfy the above-mentioned color difference. A coloring layer with conditions for total light transmittance.

[0143] (2)Adhesive layer When the coloring layer 6 in the second embodiment is an adhesive layer, the adhesive layer is preferably used to tightly bond the components constituting the aerial imaging devices 10c and 10d together. For example, when the aerial imaging devices 10c and 10d are equipped with a light diffusion control unit, the adhesive layer as the coloring layer 6 is preferably stacked between the light diffusion control unit and the light-transmitting imaging unit 2 and the two are tightly bonded and fixed together.

[0144] The adhesive constituting the adhesive layer is not particularly limited. From the perspective of easy and clear viewing of aerial images, the adhesive is preferably transparent. As a specific example of the adhesive, the adhesive described in the first embodiment can be used, but from the perspective of easily achieving the desired adhesion and transparency, an acrylic adhesive is preferred. Furthermore, the adhesive can also be a solvent-based adhesive, a solvent-free adhesive, or an emulsion adhesive.

[0145] The aforementioned acrylic adhesive is preferably composed of an adhesive composition containing a (meth)acrylate polymer and a coloring agent, and is particularly preferably composed of an adhesive composition containing a (meth)acrylate polymer, a crosslinking agent and a coloring agent.

[0146] (2-1) (Meth)acrylate polymers From the perspective of easily achieving the desired adhesive force (especially the adhesiveness of the light diffusion control section and the light transmission imaging section), the (meth)acrylate polymer preferably contains an alkyl (meth)acrylate as a monomer unit constituting the polymer, and particularly preferably an alkyl (meth)acrylate containing 1 to 20 carbon atoms.

[0147] Examples of alkyl methacrylates with 1 to 20 carbon atoms in the alkyl group include methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, n-pentyl methacrylate, n-hexyl methacrylate, 2-ethylhexyl methacrylate, isooctyl methacrylate, n-decyl methacrylate, n-dodecyl methacrylate, myristyl methacrylate, palmitate methacrylate, stearate methacrylate, cyclohexyl methacrylate, isobornyl methacrylate, and adamantane methacrylate. From the perspective of further improving adhesion, alkyl methacrylates with 1 to 8 carbon atoms in the alkyl group are preferred, and at least one of methyl methacrylate, 2-ethylhexyl methacrylate, and isobornyl methacrylate is more preferred. These alkyl methacrylates can be used alone or in combination of two or more.

[0148] As the monomer unit constituting the polymer, the (meth)acrylate polymer preferably contains 50-99.9% by mass, more preferably 60-99% by mass, particularly preferably 70-96% by mass, further preferably 75-92% by mass, and especially preferably 80-88% by mass of an alkyl (meth)acrylate having 1-20 carbon atoms. This readily provides suitable adhesion, particularly excellent adhesion to light diffusion control sections and light-transmitting imaging sections. Furthermore, appropriate amounts of other monomer components, such as monomers containing reactive functional groups, can be introduced into the (meth)acrylate polymer.

[0149] As the monomer unit constituting the polymer, the (meth)acrylate polymer preferably comprises monomers containing reactive functional groups within the molecule. In particular, when the adhesive composition contains a crosslinking agent, the reactive functional groups of the monomers containing reactive functional groups react with the crosslinking agent, making it easier to control the cohesive force of the obtained adhesive. Therefore, the obtained adhesive layer readily exhibits the desired adhesive force.

[0150] Preferred monomers containing reactive functional groups include: monomers with an intramolecular hydroxyl group (hydroxyl-containing monomers), monomers with an intramolecular carboxyl group (carboxyl-containing monomers), and monomers with an intramolecular amino group (amino-containing monomers). Among these, monomers containing hydroxyl groups are preferred. These monomers containing reactive functional groups can be used alone or in combination of two or more.

[0151] Examples of hydroxyl-containing monomers include, for example, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, and other hydroxyalkyl (meth)acrylate esters. Among these, 2-hydroxyethyl (meth)acrylate is preferred. These hydroxyl-containing monomers can be used alone or in combination of two or more.

[0152] Examples of carboxyl-containing monomers include acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, citraconic acid, and other olefinic unsaturated carboxylic acids. These carboxyl-containing monomers can be used alone or in combination of two or more.

[0153] Examples of amino-containing monomers include aminoethyl (meth)acrylate and n-butylaminoethyl (meth)acrylate. These amino-containing monomers can be used alone or in combination of two or more.

[0154] As the monomer unit constituting the polymer, the (meth)acrylate polymer preferably contains 0.1 to 50% by mass, particularly more preferably 1 to 40% by mass, especially preferably 4 to 30% by mass, further preferably 8 to 25% by mass, and particularly preferably 12 to 20% by mass of a monomer containing reactive functional groups. This results in increased adhesiveness, allowing the adhesive layer to easily exert the desired adhesion, particularly exhibiting excellent adhesion to light diffusion control sections and light-transmitting imaging sections.

[0155] (Meth)acrylate polymers can be polymers formed by copolymerizing the aforementioned alkyl (meth)acrylates, monomers containing reactive functional groups, and other monomers. As other monomers, monomers without reactive functional groups are preferred to avoid hindering the aforementioned effects of the monomers containing reactive functional groups. Examples of such monomers include methoxyethyl (meth)acrylate, ethoxyethyl (meth)acrylate, alkoxyalkyl (meth)acrylates, vinyl acetate, and styrene. These other monomers can be used alone or in combination of two or more. Furthermore, the polymerization form of this polymer can be a random copolymer or a block copolymer. Additionally, this polymer can be used alone or in combination of two or more.

[0156] The weight-average molecular weight of the (meth)acrylate polymer is preferably 100,000 to 3,000,000, more preferably 200,000 to 2,400,000, particularly preferably 300,000 to 1,800,000, further preferably 400,000 to 1,200,000, and especially preferably 500,000 to 900,000. This results in an adhesive layer that readily exhibits the desired adhesion, particularly excellent adhesion to light diffusion control sections and light-transmitting imaging sections. Furthermore, the method for determining the weight-average molecular weight in this specification refers to the value converted from standard polystyrene determined by gel permeation chromatography (GPC).

[0157] (2-2) Crosslinking agent The crosslinking agent can be any crosslinking agent that reacts with the reactive functional groups of the (meth)acrylate polymer. Examples include isocyanate-based crosslinking agents, epoxy-based crosslinking agents, amine-based crosslinking agents, melamine-based crosslinking agents, aziridine-based crosslinking agents, hydrazine-based crosslinking agents, aldehyde-based crosslinking agents, oxazoline-based crosslinking agents, metal alkoxide-based crosslinking agents, metal chelate-based crosslinking agents, metal salt-based crosslinking agents, and ammonium salt-based crosslinking agents. Among these, isocyanate-based crosslinking agents with excellent reactivity with hydroxyl and carboxyl groups, or epoxy-based crosslinking agents with excellent reactivity with carboxyl groups, are preferred. Furthermore, one type of crosslinking agent can be used alone, or two or more can be used in combination.

[0158] Isocyanate-based crosslinking agents include at least polyisocyanate compounds. Examples of polyisocyanate compounds include, for instance, aromatic polyisocyanates such as toluene diisocyanate, diphenylmethane diisocyanate, and xylene diisocyanate; aliphatic polyisocyanates such as hexamethylene diisocyanate; alicyclic polyisocyanates such as isophorone diisocyanate and hydrogenated diphenylmethane diisocyanate; their biuret forms, isocyanurate forms, and adducts of their reactions with low-molecular-weight compounds containing active hydrogen, such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, and castor oil. From the perspective of reactivity with hydroxyl groups, trimethylolpropane-modified aromatic polyisocyanates are preferred, and trimethylolpropane-modified toluene diisocyanate and trimethylolpropane-modified xylene diisocyanate are particularly preferred.

[0159] Examples of epoxy-based crosslinking agents include 1,3-bis(N,N-diglycidylaminomethyl)cyclohexane, N,N,N',N'-tetra(epoxyethylenemethyl)-1,3-phenylenediamine, ethylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, trimethylolpropane diglycidyl ether, diglycidyl aniline, and diglycidylamine. Among these, 1,3-bis(N,N-diglycidylaminomethyl)cyclohexane is preferred from the perspective of its reactivity with carboxyl groups.

[0160] The crosslinking agent content in the adhesive composition is preferably 0.01 to 5 parts by weight relative to 100 parts by weight of the (meth)acrylate polymer, more preferably 0.05 to 3 parts by weight, particularly preferably 0.08 to 1 part by weight, further preferably 0.12 to 0.7 parts by weight, and most preferably 0.15 to 0.4 parts by weight. This makes it easier to obtain adhesives with suitable physical properties and adhesion, especially excellent adhesion to light diffusion control parts and light-transmitting imaging parts.

[0161] (2-3) Coloring components When the coloring layer 6 is an adhesive layer, the aforementioned coloring component can be appropriately selected as the coloring agent. The content of the coloring agent in the adhesive composition is preferably 0.01 to 20 parts by weight relative to 100 parts by weight of the (meth)acrylate polymer, particularly preferably 0.05 to 15 parts by weight, further preferably 0.10 to 10 parts by weight, and especially preferably 0.20 to 5 parts by weight. This facilitates the achievement of superior appearance harmony.

[0162] (2-4) Various additives Various additives commonly used in acrylic adhesives can be added to the adhesive composition as needed, such as ultraviolet absorbers, infrared absorbers, silane coupling agents, photopolymerization initiators, tackifiers, antioxidants, light stabilizers, deoxidizers, rust inhibitors, surfactants, softeners, fillers, refractive index modifiers, antistatic agents, etc.

[0163] (2-5) Preparation of adhesive compositions The adhesive composition can be prepared by mixing (meth)acrylate polymers, crosslinking agents, coloring agents, and other additives.

[0164] (Meth)acrylate polymers can be prepared by polymerizing a mixture of monomer units constituting the polymer using conventional free radical polymerization. The polymerization of (meth)acrylate polymers can be carried out using a polymerization initiator as needed, and by methods such as solution polymerization. Examples of polymerization solvents include ethyl acetate, n-butyl acetate, isobutyl acetate, toluene, acetone, hexane, and methyl ethyl ketone; two or more solvents may be used simultaneously. Examples of polymerization initiators include azo compounds and organic peroxides; two or more initiators may be used simultaneously. Furthermore, the weight-average molecular weight of the obtained polymer can be adjusted by incorporating chain transfer agents such as 2-mercaptoethanol during the above polymerization process.

[0165] After obtaining the (meth)acrylate polymer, a crosslinking agent, coloring agent, and other additives as needed are added to the solution of the (meth)acrylate polymer and mixed thoroughly to obtain an adhesive composition (coating solution) diluted with solvent.

[0166] As a diluent for preparing a coating solution by diluting the adhesive composition, for example, aliphatic hydrocarbons such as hexane, heptane, and cyclohexane, aromatic hydrocarbons such as toluene and xylene, halogenated hydrocarbons such as dichloromethane and dichloroethane, alcohols such as methanol, ethanol, propanol, butanol, and 1-methoxy-2-propanol, acetone, methyl ethyl ketone, 2-pentanone, isophorone, and cyclohexanone, esters such as ethyl acetate and butyl acetate, and cellosol solvents such as ethyl cellosol.

[0167] The concentration and viscosity of the coating solution prepared in the above manner are not particularly limited as long as they are within a range suitable for coating and can be appropriately selected according to the situation. For example, the adhesive composition can be diluted to a concentration of 10 to 40% by mass. In addition, the addition of diluents is not necessary when obtaining the coating solution; as long as the adhesive composition has a viscosity suitable for coating, diluents may not be added.

[0168] (2-6) Formation of adhesive layer The adhesive layer is preferably composed of an adhesive formed by crosslinking the aforementioned adhesive composition. Crosslinking of the adhesive composition can typically be achieved through heat treatment. Furthermore, this heat treatment can also serve as a drying process to allow diluents or other solvents to evaporate from the coating of the adhesive composition applied to the desired object.

[0169] The heating temperature for the heat treatment is preferably 50~150℃, and more preferably 70~120℃. Furthermore, the heating time is preferably 10 seconds~10 minutes, and more preferably 50 seconds~2 minutes.

[0170] After heat treatment, a curing period of approximately 1 to 2 weeks can be set at room temperature (e.g., 23°C, 50%RH) as needed. If this curing period is required, the adhesive will form after the curing period; otherwise, the adhesive will form immediately after the heat treatment is completed.

[0171] Through the above-mentioned heat treatment (and aging), the (meth)acrylate polymer is fully cross-linked by the cross-linking agent.

[0172] (2-7) Properties of the adhesive layer, etc. When the coloring layer 6 in the second embodiment is an adhesive layer, the total light transmittance of the adhesive layer is preferably 10-99%, particularly preferably 15-98%, and even more preferably 20-95%. By ensuring that the total light transmittance of the coloring layer 6 alone is within the above range, the aerial imaging devices 10c and 10d of the second embodiment constructed using the coloring layer 6 easily satisfy the aforementioned total light transmittance and color difference ΔE. The conditions are as follows. Furthermore, details of the method for determining the total transmittance described above are shown in the experimental examples described later.

[0173] When the coloring layer 6 is an adhesive layer, the thickness of the adhesive layer is preferably 1 to 500 μm, more preferably 2 to 300 μm, particularly preferably 4 to 200 μm, further preferably 8 to 100 μm, and especially preferably 12 to 50 μm. This facilitates achieving superior appearance harmony. In particular, it makes it easier to obtain the color difference ΔE required to satisfy the aforementioned requirements. The coloring layer meets the conditions of total light transmittance and has excellent adhesion to the light diffusion control section and the light transmission imaging section.

[0174] (3) Light diffusion control unit In the second embodiment, when the coloring layer 6 is a light diffusion control unit, the light diffusion control unit causes light incident into the light diffusion control unit to diffuse or transmit according to its incident angle, and has a regular internal structure in the shape of louvers. The regular internal structure in the shape of louvers has multiple plate-shaped regions with relatively high refractive indices in regions with relatively low refractive indices.

[0175] Figure 6 A perspective view illustrating the internal structure of the light diffusion control unit 6' is provided. Figure 6 As shown, the light diffusion control unit 6' has a regular internal structure in the shape of louvers. This regular internal structure has multiple plate-shaped regions 61 with relatively high refractive indices in the region 62 with relatively low refractive index. Furthermore, the direction perpendicular to the long side of the plate-shaped regions 61 and existing on the surface of the light diffusion control unit 6' opposite to the light-transmitting imaging unit 2 ( Figure 6 In the diagram, the direction indicated by "D1" is set as the "first direction". Additionally, the function of the light diffusion control unit 6' is related to... Figure 3 The light diffusion control unit 3' shown is the same.

[0176] The aforementioned light diffusion control unit 6' can also be as follows: Figure 4 The light-transmitting imaging unit 2 is shown to be positioned on the side opposite to the display unit 1. Furthermore, the aforementioned light diffusion control unit 6' can also be configured as follows: Figure 5 The light diffusion control unit 6' shown is disposed on one side of the display unit 1 of the light-transmitting imaging unit 2. The effect of the light diffusion control unit 6' produced when these positional relationships are met is the same as that of the light diffusion control unit 3' in the first embodiment.

[0177] The same material used for the light diffusion control unit 6' in the third embodiment as for the light diffusion control unit 7 can be used. Furthermore, the same method used for forming the light diffusion control unit 6' as for the light diffusion control unit 7 in the third embodiment can be used.

[0178] When the coloring layer 6 is a light diffusion control section 6', the aforementioned coloring component can be appropriately selected as the coloring component. The content of the coloring component in the composition for the light diffusion control section is preferably 0.001 to 10 parts by mass relative to 100 parts by mass of the high refractive index component, more preferably 0.004 to 6 parts by mass, particularly preferably 0.008 to 3 parts by mass, and even more preferably 0.01 to 2 parts by mass. This easily satisfies the aforementioned color difference ΔE. Given the conditions of total light transmittance, it is easy to achieve better aesthetic harmony.

[0179] In the light diffusion control unit 6', similar to the light diffusion control unit 3' in the first embodiment, the plate-shaped region 61 is preferably inclined. In this case, the angle of inclination relative to the thickness direction of the light diffusion control unit 6' is preferably 0° to 30°, more preferably 1° to 25°, particularly preferably 2° to 20°, and even more preferably 3° to 10°. Therefore, the aerial imaging devices 10c and 10d of the second embodiment can easily suppress ghosting or interference light and can easily display aerial images more brightly.

[0180] The light diffusion control unit 6' is the same as the light diffusion control unit 3' in the first embodiment. It can be bent along the thickness direction and can also be stacked with two or more layers of regular internal structure formed by plate-shaped regions 61.

[0181] The thickness of the light diffusion control section 6' is preferably 1 to 500 μm, more preferably 10 to 300 μm, particularly preferably 50 to 250 μm, and even more preferably 80 to 200 μm. Therefore, the aerial imaging devices 10c and 10d of the second embodiment can easily achieve better aesthetic coordination, furthermore, easily suppress ghosting or interference light, and easily display aerial images more brightly.

[0182] (4) Other components In the second embodiment, when the coloring layer 6 is a coating, the coating is preferably as follows: Figure 1 The coating is stacked on the side of the light-transmitting imaging section 2 opposite to the display section 1, thus protecting the surface of the light-transmitting imaging section 2. Furthermore, the coating can be formed on a substrate; in this case, it can be a coating film having the coating and the substrate stacked on the light-transmitting imaging section 2.

[0183] The coating is preferably formed by curing a coating composition containing, for example, an active energy ray curable component, the aforementioned coloring component, and other additives.

[0184] Furthermore, when the coloring layer 6 in the second embodiment is a substrate, the substrate can be disposed on the outermost surface of the viewer side of the laminate, such as the light-transmitting imaging section 2, and has the function of protecting the laminate, or it can have the function of forming other components constituting the aerial imaging devices 10c and 10d.

[0185] The aforementioned substrate can be formed from a material containing a main agent and a coloring component. While the main agent is not particularly limited, it is preferably a resin, and particularly preferably a transparent resin.

[0186] 4. Other constituent elements The aerial imaging devices 10c and 10d in the second embodiment may have multiple layers of coloring layers 6. For example, coloring layers 6 may be stacked on both sides of the light-transmitting imaging unit 2.

[0187] Furthermore, the aerial imaging devices 10c and 10d in the second embodiment may also include at least one of the following: a coating layer, an adhesive layer, a substrate, and a light diffusion control unit, which is not the coloring layer 6 (does not contain coloring components). In particular, when the coloring layer 6 is an adhesive layer, it is more suitable that the aerial imaging devices 10c and 10d include other components such as a light diffusion control unit, and the coloring layer 6, as an adhesive layer, serves to tightly adhere and fix these components to each other.

[0188] Furthermore, the aerial imaging devices 10c and 10d of the second embodiment preferably include a frame for fixing and storing the display unit 1, the light-transmitting imaging unit 2, and the coloring layer 6 in a predetermined position.

[0189] The material, shape, and size of the frame can be appropriately selected according to the application and purpose. In particular, the frame is preferably made of a light-shielding material, which can prevent light from the display unit 1 from accidentally leaking to the outside, and at the same time prevent external light from unintentionally entering the light path from the display unit 1 to the light-transmitting imaging unit 2, etc.

[0190] 5. The positional relationship of each element When the aerial imaging devices 10c and 10d in the second embodiment have a light diffusion control unit 6' as a coloring layer 6, the condition of "the angle of the acute angle formed by the first direction and the second direction" is preferably satisfied, similar to the first embodiment.

[0191] Furthermore, when the aerial imaging devices 10c and 10d in the second embodiment have a light diffusion control unit 6' as a coloring layer 6 and have a retrotransmitting optical element with a dihedral reflector array structure as described above, or a retrotransmitting optical element composed of two layers having multiple reflective surfaces as a light-transmitting imaging unit 2, similar to the first embodiment, it is preferable to construct each element of the aerial imaging devices 10c and 10d in a manner that simultaneously satisfies "(Condition 1)" and "(Condition 2)".

[0192] 6. Manufacturing method of aerial imaging device The manufacturing method of the aerial imaging devices 10c and 10d in the second embodiment is not particularly limited. For example, after preparing the display unit 1, the light-transmitting imaging unit 2 and the coloring layer 6 respectively, the display unit 1 can be set at a predetermined position in the frame, and a laminate of the light-transmitting imaging unit 2 and the coloring layer 6 can be set, thereby obtaining the aerial imaging devices 10c and 10d.

[0193] 7. How to use the aerial imaging device The aerial imaging devices 10c and 10d of the second embodiment can be used as display devices for displaying arbitrary images, videos, etc. in the air. Their specific usage is not limited, and they can be used in the same manner as conventionally known display devices.

[0194] [Laminated structure of the second implementation scheme] The laminate in the second embodiment is a structure in which the display unit 1 is omitted from the aerial imaging devices 10c and 10d. That is, the laminate in the second embodiment includes: a light-transmitting imaging unit 2 that images light incident from one side of the surface onto a position on the other side; and a coloring layer 6 laminated on one side of the light-transmitting imaging unit 2 and containing coloring components. Here, the details of the composition and structure of the light-transmitting imaging unit 2 and the coloring layer 6 are as described above.

[0195] The laminated body of the second embodiment can be obtained by laminating the light-transmitting imaging unit 2 and the coloring layer 6 after preparing them separately. Furthermore, the laminated body of the second embodiment can be used to form the aerial imaging devices 10c and 10d of the second embodiment. That is, the aerial imaging devices 10c and 10d of the second embodiment can be obtained by arranging the display unit 1 at a predetermined position on the laminated body of the second embodiment.

[0196] [Aerial Imaging Device of the Third Implementation Scheme] Figures 7-9 The following are cross-sectional views schematically illustrating an example of an aerial imaging device according to the third embodiment. Figures 7-9 As shown in the third embodiment, the aerial imaging devices 10e, 10f, and 10g include: a display unit 1 having a display surface and emitting light from the display surface; a light-transmitting imaging unit 2 disposed on the display surface side of the display unit 1; and a light diffusion control unit 7 superimposed on the surface side of the light-transmitting imaging unit 2 opposite to the display unit 1 or on the surface side of the display unit 1 of the light-transmitting imaging unit 2.

[0197] Here, the light-transmitting imaging unit 2 transmits light from the aforementioned display surface and images it at a position opposite to the display unit 1. Furthermore, the light diffusion control unit 7 diffuses or transmits light incident upon it according to its incident angle, and has a regular internal structure resembling louvers, which has multiple plate-like regions with relatively high refractive indices in regions with relatively low refractive indices.

[0198] Furthermore, the aerial imaging device in the third embodiment further includes a weather-resistant layer containing an ultraviolet absorber, or the light diffusion control unit 7 contains an ultraviolet absorber.

[0199] Figure 7 and Figure 8 The aerial imaging devices 10e and 10f shown do not have a weather-resistant layer, and the light diffusion control unit 7 contains an ultraviolet absorber.

[0200] on the other hand, Figure 9 The aerial imaging device 10g shown has a weather-resistant layer 8 on the surface of the light-transmitting imaging section 2 opposite to the light diffusion control section 7. Furthermore, when the aerial imaging device of the third embodiment has the weather-resistant layer 8, the position of the weather-resistant layer 8 is not limited to... Figure 3 The position shown can also exist in other positions. That is, the weather-resistant layer 8 can also be provided at least one position: the side of the light-transmitting imaging section 2 opposite to the light diffusion control section 7, the side of the light diffusion control section 7 opposite to the light-transmitting imaging section 2, and between the light-transmitting imaging section 2 and the light diffusion control section 7.

[0201] In addition, as examples of the weather-resistant layer 8, at least one of the following can be listed: a coating containing a UV absorber, an adhesive layer containing a UV absorber, an adhesive layer containing a UV absorber, and a substrate containing a UV absorber.

[0202] As described above, the aerial imaging devices 10e, 10f, and 10g of the third embodiment, by including an ultraviolet absorber in the light diffusion control unit 7 or having a weather-resistant layer containing an ultraviolet absorber, significantly reduce the effect of ultraviolet radiation on the light diffusion control unit 7 even when the laminate containing the light diffusion control unit 7 is exposed to ultraviolet light such as sunlight for a long time, due to the action of the ultraviolet absorber. This suppresses light degradation of the light diffusion control unit 7, preventing it from yellowing. As a result, the aerial imaging devices 10e, 10f, and 10g of the third embodiment exhibit excellent weather resistance and can provide good aerial image viewing.

[0203] Furthermore, for aerial imaging devices 10e and 10g, which are configured such that the light diffusion control unit 7 is stacked on the surface side of the display unit 1 of the light-transmitting imaging unit 2... Figure 7 and Figure 9This method can effectively suppress ghosting. The following explains this effect.

[0204] Figure 10 A perspective view illustrating the internal structure of the light diffusion control unit 7 is provided. Figure 10 As shown, the light diffusion control unit 7 has a regular internal structure in the shape of louvers. Within this regular internal structure, multiple plate-shaped regions 71 with relatively high refractive indices are present in the region 72 with relatively low refractive index. Furthermore, the direction perpendicular to the long side of the plate-shaped regions 71 and existing on the surface of the light diffusion control unit 7 opposite to the light-transmitting imaging unit 2 ( Figure 10 In the diagram, the direction indicated by "D1" is set as the "first direction". Additionally, the function of the light diffusion control unit 6' is related to... Figure 3 The light diffusion control unit 3' shown is the same.

[0205] For the aerial imaging devices 10e and 10g in the third embodiment, if the desired image (real image) is displayed on the display surface of the display unit 1, then when viewed from the designated observation point 5, it is possible to... Figure 7 At the location marked "4", you can see the image formed by the above real image in the air (aerial image). In addition, in this specification, the surface at the location marked "4" is called the "aerial image observation surface".

[0206] In conventional aerial imaging devices, an image known as ghosting sometimes appears alongside the aerial image. To suppress this ghosting, optical elements are sometimes used that only block the light that contributes to the formation of ghosting. However, since these optical elements block some of the light emanating from the display unit 1, they reduce the brightness of the aerial image, making it difficult for viewers to see the aerial image.

[0207] In response, the aerial imaging devices 10e and 10g in the third embodiment, by providing a light diffusion control unit 7, can effectively suppress ghosting while maintaining sufficient brightness in the aerial image. This effect, as described below, is presumed to be due to the function of the light diffusion control unit 7. However, it is not limited to this function, and the possibility of other functions cannot be ruled out.

[0208] Figure 11 The diagram illustrates the function of the light diffusion control unit 7, and in particular, the relationship between the optical characteristics of the light diffusion control unit 7 and the light that forms aerial images and ghosting.

[0209] As described above, the light diffusion control unit 7 diffuses light incident within a specified incident angle range and transmits light incident outside that incident angle range with substantially no diffusion. Figure 11The graph shows the relationship between the incident angle of light incident on the light diffusion control unit 7 and the haze value. Specifically, for light incident within an incident angle range of approximately -10° to approximately 10°, a haze value greater than 80% is displayed (i.e., the light is diffusely transmitted). On the other hand, for light incident within an incident angle range of approximately -70° to approximately -20°, a haze value of approximately 15% is displayed (i.e., the light is transmitted with almost no diffusion). Additionally, incident angles that sometimes cause significant changes in haze value ( Figure 11 In the meantime (around -15°), this is called the "threshold".

[0210] Here, the "haze value" mentioned above differs from the usual "haze." It refers to the measured value obtained by maintaining a specified distance between the integrating sphere opening and the sample and changing the incident angle on the sample. In the measurement of this specification, the specified distance is set to 20 mm, but this value is not particularly limited as long as the direct transmission / diffuse transmission value of the incident light can be confirmed.

[0211] The aerial imaging devices 10e and 10g in the third embodiment have a light diffusion control unit 7, which displays the aforementioned optical characteristics, located between the display unit 1 and the light-transmitting imaging unit 2. The light diffusion control unit 7 ensures that the light used to form the aerial image reaches the light-transmitting imaging unit 2 effectively, and that the light used to form ghosting reaches the light-transmitting imaging unit 2 in a diffused state. Therefore, the viewer can clearly see the aerial image and is less likely to see ghosting. Furthermore, since the light diffusion control unit 7 does not block light but controls its diffusion, it can display the aerial image with sufficient brightness while suppressing ghosting.

[0212] Furthermore, by appropriately adjusting the type of the light diffusion control unit 7, or its stacking state with the light-transmitting imaging unit 2, etc., as... Figure 5 The method shown, which places the threshold between the incident angle range of the light used to form the aerial image and the incident angle range of the light used to form the ghost image, can achieve better results.

[0213] Furthermore, for the aerial imaging device 10f, which is composed of a light diffusion control unit 7 stacked on the side opposite to the display unit 1 of the light-transmitting imaging unit 2... Figure 8 This can effectively suppress the influence of interfering light. The following explains this effect.

[0214] The inventors of this application have conducted various studies and have concluded that the aforementioned interference light is caused by the following phenomenon: light incident from an external light source onto the translucent imaging unit 2 returns to the viewer's direction (hereinafter sometimes referred to as "return light"). It is speculated that this return light, especially when the translucent imaging unit is a retrotransmission optical element described later, is light from an external light source incident into the interior of the retrotransmission optical element, whose emission direction changes drastically within the retrotransmission optical element, and is thus emitted from the viewer's side surface.

[0215] The aerial imaging device 10f of the third embodiment is configured with a light diffusion control unit 7 on the viewer-side surface of the light-transmitting imaging unit 2. Light incident on the light-transmitting imaging unit 2 from an external light source diffuses through the light diffusion control unit 7. This reduces backlighting while suppressing color distortion and improving visibility. On the other hand, light from the display unit 1 is directly transmitted through the light diffusion control unit 7, allowing for a clear display of the aerial image. As a result, the aerial imaging device 10f of the third embodiment allows for excellent viewing of aerial images because it suppresses backlighting and interference light.

[0216] 1. Display section As the display unit 1 constituting the aerial imaging devices 10e, 10f, and 10g in the third embodiment, the same display unit as that in the first embodiment can be used. Furthermore, the preferred positional relationship between the display unit 1 and the light diffusion control unit 7, the light-transmitting imaging unit 2, and the weather-resistant layer 8 is also the same as the positional relationship between the display unit 1 and the light-transmitting imaging unit 2 and the antistatic layer 3 in the first embodiment.

[0217] 2. Light-transmitting imaging unit The light-transmitting imaging unit 2, which constitutes the aerial imaging devices 10e, 10f, and 10g in the third embodiment, can be the same light-transmitting imaging unit as that in the first embodiment.

[0218] 3. Light diffusion control unit The light diffusion control unit 7 of the aerial imaging devices 10e, 10f, and 10g constituting the third embodiment can have any regular internal structure in the shape of louvers as long as it has the aforementioned structure, without any particular limitation.

[0219] From the perspective of easily forming the aforementioned internal structure, the light diffusion control section 7 is preferably a material formed by curing a light diffusion control section composition, which contains a high refractive index component and a low refractive index component having a lower refractive index than the high refractive index component. In particular, the high refractive index component and the low refractive index component preferably each have one or two polymerizable functional groups.

[0220] Furthermore, when the light diffusion control section 7 contains an ultraviolet absorber, the composition for the light diffusion control section preferably further contains an ultraviolet absorber.

[0221] In addition, from the perspective of SDGs, the materials constituting the light diffusion control unit 7 can be materials with high bio-based content, materials that can be recycled or reused, or materials that have been recycled or reused.

[0222] (1) High refractive index components As preferred examples of high refractive index, (meth)acrylates containing aromatic rings can be listed, and (meth)acrylates containing multiple aromatic rings are particularly preferred. Examples of (meth)acrylates containing multiple aromatic rings include biphenyl (meth)acrylate, naphthyl (meth)acrylate, anthracene (meth)acrylate, benzylidene (meth)acrylate, biphenyloxyalkyl (meth)acrylate, naphthoxyalkyl (meth)acrylate, anthraceneoxyalkyl (meth)acrylate, benzylidene (meth)acrylate, and compounds formed by substituting a portion of these compounds with halogens, alkyl groups, alkoxy groups, or haloalkyl groups. Among these, biphenyl (meth)acrylate is preferred from the perspective of easily forming a good regular internal structure, and more specifically, o-phenylphenoxyethyl acrylate and o-phenylphenoxyethoxyethyl acrylate are preferred.

[0223] The molecular weight of the high refractive index component is preferably 150 to 2500, particularly preferably 200 to 1500, and even more preferably 250 to 1000. This facilitates the formation of a light diffusion control section 7 with the desired regular internal structure. Furthermore, when the theoretical molecular weight of the high refractive index component can be determined based on its molecular structure, the molecular weight of the high refractive index component refers to that theoretical molecular weight. However, when the theoretical molecular weight is difficult to determine because the high refractive index component is, for example, a polymer, the molecular weight of the high refractive index component refers to the weight-average molecular weight obtained as a value converted from standard polystyrene determined by gel permeation chromatography (GPC). Additionally, the method for determining the weight-average molecular weight in this specification refers to the value converted from standard polystyrene determined by this GPC method.

[0224] The refractive index of the high-refractive-index component is preferably 1.45 to 1.70, more preferably 1.50 to 1.65, particularly preferably 1.54 to 1.62, and even more preferably 1.56 to 1.59. This facilitates the formation of the light diffusion control section 7 with the desired regular internal structure. Furthermore, the refractive index in this specification refers to the refractive index of a specified component before the light diffusion control section is cured with the composition, and this refractive index is a value measured based on JIS K0062:1992.

[0225] The content of the high refractive index component in the composition for the light diffusion control section is preferably 25 to 400 parts by mass relative to 100 parts by mass of the low refractive index component, more preferably 50 to 350 parts by mass, particularly preferably 75 to 300 parts by mass, and even more preferably 100 to 200 parts by mass. Thus, in the regular internal structure of the formed light diffusion control section 7, the regions from the high refractive index component and the regions from the low refractive index component exist in the desired proportion, making it easy to form the desired regular internal structure.

[0226] (2) Low refractive index components Preferred examples of low refractive index components include urethane (meth)acrylates, (meth)acrylic polymers having (meth)acryloyl groups in the side chains, silicone resins containing (meth)acryloyl groups, and unsaturated polyester resins. Among these, urethane (meth)acrylates are particularly preferred from the perspective of easily forming a good regular internal structure. More specifically, urethane (meth)acrylates formed from (a) a compound containing at least two isocyanate groups, (b) a polyalkylene glycol, and (c) a (meth)acrylate hydroxyalkyl ester are preferred.

[0227] Preferred examples of compounds containing at least two isocyanate groups as described in (a) above include aromatic polyisocyanates such as 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 1,3-phenylenedimethylene diisocyanate, and 1,4-phenylenedimethylene diisocyanate; aliphatic polyisocyanates such as hexamethylene diisocyanate; alicyclic polyisocyanates such as isophorone diisocyanate and hydrogenated diphenylmethane diisocyanate; biuret forms and isocyanurate forms of these compounds; and adducts as reaction products with low-molecular-weight compounds containing active hydrogen such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, and castor oil. Alicyclic polyisocyanates are preferred, and alicyclic diisocyanates are particularly preferred.

[0228] Preferred examples of the polyalkylene glycols in (b) above include polyethylene glycol, polypropylene glycol, polybutane glycol, and polyhexane glycol. Polypropylene glycol is preferred. Furthermore, the weight-average molecular weight of the polyalkylene glycols in (b) is preferably 2300 to 19500, particularly preferably 3000 to 14300, and even more preferably 4000 to 12300.

[0229] Preferred examples of (c)(meth)acrylate hydroxyalkyl esters include 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 3-hydroxypropyl methacrylate, 2-hydroxybutyl methacrylate, 3-hydroxybutyl methacrylate, and 4-hydroxybutyl methacrylate. Among these, 2-hydroxyethyl methacrylate is preferred.

[0230] The synthesis of urethane (meth)acrylates using the components (a) to (c) above as materials can be carried out by conventional methods. In this case, from the perspective of efficiently synthesizing urethane (meth)acrylates, the molar ratio of components (a) to (c) is preferably (a):(b):(c) = 1 to 5:1:1 to 5, and particularly preferably 1 to 3:1:1 to 3.

[0231] The weight-average molecular weight of the low-refractive-index component is preferably 3,000 to 20,000, particularly preferably 5,000 to 15,000, and even more preferably 7,000 to 13,000. This facilitates the formation of the light diffusion control section 7 with the desired regular internal structure.

[0232] The refractive index of the low-refractive-index component is preferably 1.30 to 1.59, more preferably 1.38 to 1.50, particularly preferably 1.42 to 1.49, and even more preferably 1.46 to 1.48 or less. This facilitates the formation of the light diffusion control section 7 with the desired regular internal structure.

[0233] (3) Ultraviolet absorbers Examples of UV absorbers include 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3'-tert-pentyl-5'-isobutylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3'-isobutyl-5'-methylphenyl)-5-chlorobenzotriazole, and 2-(2'-hydroxy-3'-isobutyl-5'-propylphenyl)-5-chlorobenzotriazole. 2'-hydroxyphenyl-5-chlorobenzotriazole and other 2'-hydroxyphenyl-5-chlorobenzotriazole UV absorbers; 2'-hydroxyphenylbenzotriazole and 2'-(2'-hydroxy-3',5'-di-tert-butylphenyl)benzotriazole and other 2'-hydroxyphenylbenzotriazole UV absorbers; 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone and other 2,2'-dihydroxyphenylbenzophenone Benzophenone-based UV absorbers; 2-hydroxy-4-methoxybenzophenone, 2,4-dihydroxybenzophenone, and other 2-hydroxybenzophenone-based UV absorbers; phenyl salicylate, 4-tert-butyl-phenyl-salicylate, and other salicylate-based UV absorbers; cyanoacrylate-based UV absorbers such as 2-ethyl-hexyl-2-cyano-3,3-diphenylacrylate, ethyl-2-cyano-3,3-diphenylacrylate, and octyl-2-cyano-3,3-diphenylacrylate; 2-(4,6 Triazine-based UV absorbers include bis(2,4-dimethylphenyl)-1,3,5-triazine-2-yl)-5-hydroxyphenyl, 2-(2,4-dihydroxyphenyl)-4,6-bis-(2,4-dimethylphenyl)-1,3,5-triazine, 2,4-bis[2-hydroxy-4-butoxyphenyl]-6-(2,4-dibutoxyphenyl)-1,3,5-triazine, and tris(hydroxyphenyl)triazine; reactive UV absorbers with acryloyl or methacryloyl groups introduced onto the benzotriazole skeleton. These UV absorbers can be used alone or in combination of two or more.

[0234] Relative to the total amount of 100 parts by mass of the high-refractive-index and low-refractive-index components, the content of the ultraviolet absorber in the composition for the light diffusion control section is preferably 0.001 to 10 parts by mass, more preferably 0.01 to 1 part by mass, particularly preferably 0.03 to 0.5 parts by mass, and even more preferably 0.06 to 0.2 parts by mass. This readily achieves excellent weather resistance.

[0235] (4) Other additives In addition to high-refractive-index and low-refractive-index components, the aforementioned composition for light diffusion control may also contain other additives. Examples of such additives include, for instance, multifunctional monomers, photopolymerization initiators, antioxidants, light stabilizers, antistatic agents, polymerization accelerators, plasticizers, infrared absorbers, plasticizers, diluents, and leveling agents.

[0236] Of the above, the composition for the light diffusion control section preferably contains a light stabilizer. Examples of light stabilizers include hindered amine light stabilizers, benzophenone light stabilizers, and benzotriazole light stabilizers. Among these, hindered amine light stabilizers are preferred from the perspective of easily achieving excellent weather resistance. Two or more of these light stabilizers can be used alone or in combination.

[0237] The content of the light stabilizer in the composition for light diffusion control is preferably 0.1 to 20 parts by mass relative to the total amount of high-refractive-index and low-refractive-index components (100 parts by mass), particularly preferably 0.5 to 10 parts by mass, and even more preferably 1 to 5 parts by mass. This readily achieves excellent weather resistance.

[0238] Furthermore, in the above-mentioned composition for light diffusion control, it is preferable to contain a multifunctional monomer. As a multifunctional monomer, a multifunctional (meth)acrylate monomer is particularly preferred. As an example of a multifunctional (meth)acrylate monomer, the multifunctional (meth)acrylate monomer used as a coating material in the first embodiment can be used.

[0239] The content of the multifunctional monomer in the composition for light diffusion control is preferably 0.1 to 20 parts by mass relative to the total amount of high-refractive-index and low-refractive-index components (100 parts by mass), particularly preferably 0.5 to 10 parts by mass, and even more preferably 1 to 5 parts by mass. This readily achieves excellent weather resistance.

[0240] Furthermore, the composition for the light diffusion control unit described above preferably contains an antioxidant. Examples of antioxidants include hindered phenolic antioxidants, phosphorus-based antioxidants, and sulfur-based antioxidants, among which hindered phenolic antioxidants are preferred.

[0241] Examples of hindered phenolic antioxidants include triethylene glycol-bis[3-(3-tert-butyl-5-methyl-4-hydroxyphenyl)propionate], 1,6-hexanediol-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], pentaerythritol-tetra[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2,2-thiodiethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, N,N'-hexamethylenebis(3,5-di-tert-butyl-4-hydroxy-hydroxycinnamate), and 1,3,5-trimethyl-2,4-dihydroxyphenyl-3-hydroxyphenyl)propionate. 6-Tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, Tris(3,5-di-tert-butyl-4-hydroxybenzyl)-isocyanurate, 6-(4-hydroxy-3,5-di-tert-butylphenylamino)-2,4-di-n-octylthio-1,3,5-triazine, 2,4-bis[(octylthio)methyl]-o-cresol, 2,6-di-tert-butyl-p-cresol, 4,4'-butylidenebis(6-tert-butyl-3-cresol), 2,2'-methylenebis(4-methyl-6-tert-butylphenol), 2,2'-methylenebis(4-ethyl-6-tert-butylphenol), 2,6-di-tert-butyl-4-acetol, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butyl) Phenylacetane, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-1,3,5-triazine-2,4,6(1H,3H,5H)trione, isooctyl(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 1,6-hexanediol-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], pentaerythritol-tetra[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2,2-thio-diethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, N,N'-hexamethylenebis(3, Examples of hindered phenolic antioxidants include 5-di-tert-butyl-4-hydroxy-hydroxycinnamoamide, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, tris(3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, 2,4-bis(n-octylthio)-6-(4-hydroxy-3,5-di-tert-butylphenylamino)1,3,5-triazine, 2,6-di-tert-butyl-p-cresol, 2,6-di-tert-butyl-4-acetol, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-1,3,5-triazine-2,4,6(1H,3H,5H)trione, and isooctyl(3,5-di-tert-butyl-4-hydroxyphenyl)propionate. These hindered phenolic antioxidants can be used alone or in combination of two or more.

[0242] Relative to the total amount of 100 parts by mass of the high-refractive-index and low-refractive-index components, the content of the antioxidant in the composition for the light diffusion control section is preferably 0.001 to 10 parts by mass, particularly preferably 0.005 to 1 part by mass, and even more preferably 0.01 to 0.1 parts by mass. This readily achieves excellent weather resistance.

[0243] Furthermore, in the above-described composition for the light diffusion control section, a photopolymerization initiator is preferably included. This facilitates the efficient formation of the light diffusion control section 7 with the desired regular internal structure. As an example of a photopolymerization initiator, the photopolymerization initiator used as a coating material in the first embodiment can be used.

[0244] When using a photopolymerization initiator, the content of the photopolymerization initiator in the composition for the light diffusion control section is preferably 0.2 to 20 parts by mass, more preferably 0.5 to 16 parts by mass, particularly preferably 0.8 to 13 parts by mass, and even more preferably 1 to 10 parts by mass, relative to the total amount of high-refractive-index and low-refractive-index components (100 parts by mass). This allows for the easy and effective formation of a light diffusion control section 7 with the desired regular internal structure.

[0245] (5) Preparation of the composition for the light diffusion control section The composition for light diffusion control can be prepared by uniformly mixing the aforementioned high refractive index component, low refractive index component, ultraviolet absorber, and other additives such as photopolymerization initiators as required.

[0246] During the above mixing process, the mixture can be heated to a temperature of 40°C to 80°C while stirring to obtain a uniform composition for light diffusion control. Furthermore, a diluent can be added and mixed to adjust the viscosity of the obtained composition for light diffusion control to the desired level.

[0247] (6) Internal structure of the rule As described above, the light diffusion control unit 7 preferably has a regular internal structure in the shape of louvers, which has a plurality of plate-shaped regions 71 with relatively high refractive index in the region 72 with relatively low refractive index.

[0248] In the light diffusion control unit 7, similar to the light diffusion control unit 3' in the first embodiment, the plate-shaped region 71 is preferably inclined. In this case, the angle of inclination relative to the thickness direction of the light diffusion control unit 2 is preferably 0° to 30°, more preferably 1° to 25°, particularly preferably 2° to 20°, further preferably 3° to 15°, and especially preferably 3° to 10°. As a result, the aerial imaging device 10 of the third embodiment can easily suppress the occurrence of ghosting or interfering light and can easily display aerial images more brightly.

[0249] Similar to the light diffusion control unit 3' in the first embodiment, the light diffusion control unit 7 can also be bent in the thickness direction, and can also be stacked in two or more layers of a regular internal structure formed by plate-shaped regions 71.

[0250] (7) Thickness of the light diffusion control section The thickness of the light diffusion control section 7 is preferably 1 to 500 μm, more preferably 10 to 300 μm, particularly preferably 50 to 250 μm, further preferably 80 to 200 μm, and especially preferably 100 to 160 μm. Therefore, the aerial imaging device 10 of the third embodiment easily suppresses ghosting or interfering light and easily displays aerial images more brightly.

[0251] (8) Method for forming the light diffusion control section There are no particular limitations on the method for forming the light diffusion control unit 7, and it can be formed by conventionally known methods.

[0252] For example, after coating one side of the aforementioned light diffusion control composition onto a process sheet and forming a coating film, a single side (particularly the release side) of a release sheet is attached to the side of the coating film opposite to the process sheet. Then, by irradiating the coating film with active energy rays through the process sheet or the release sheet to cure it, the light diffusion control section 7 can be formed. Thus, by stacking release sheets on the coating film, maintaining the gap between the release sheets and the process sheet, and preventing the coating film from being crushed, it is easy to form a light diffusion control section 7 with uniform thickness and a desired regular internal structure.

[0253] For example, polyethylene film, polypropylene film, polybutene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, vinyl chloride copolymer film, polyethylene terephthalate film, polyethylene naphthalate film, polybutylene terephthalate film, polyurethane film, ethylene vinyl acetate film, ionomer resin film, ethylene-(meth)acrylate copolymer film, ethylene-(meth)acrylate copolymer film, polystyrene film, polycarbonate film, polyimide film, fluoropolymer film, and other resin films can be used as the release film. Furthermore, cross-linked films of these films can also be used. Further, laminated films of these films can also be used. Additionally, from the perspective of SDGs, materials with high bio-based content, recyclable or reusable materials, or materials that have been recycled or reused can be used as the materials constituting the release sheet.

[0254] The release surface of the release sheet is preferably subjected to a release treatment. Preferably, the release agent used in the release treatment includes, for example, alkyd-based, silicone-based, fluorinated, unsaturated polyester-based, polyolefin-based, and paraffin-based release agents.

[0255] There is no particular limitation on the thickness of the release sheet, but from the perspective of excellent operability and good protection of the light diffusion control part before use, it is preferably 20~200μm, more preferably 30~100μm.

[0256] As the aforementioned process sheet, a resin film, cross-linked film, or laminated film thereof, which are used as the aforementioned release sheet, can be used. Alternatively, the aforementioned release sheet can also be used as a process sheet.

[0257] From the perspective of easily forming the required light diffusion control section and ensuring good protection of the light diffusion control section before use, the thickness of the process sheet is preferably 20~250μm, more preferably 30~200μm.

[0258] Examples of the coating methods described above include blade coating, roller coating, bar coating, doctor blade coating, die coating, and gravure coating. Furthermore, the composition for the light diffusion control section can be diluted with a solvent as needed.

[0259] The coating can be irradiated with active energy rays using conventionally known methods. For example, a linear light source can be used as the source of the active energy rays, irradiating the surface of the object with a strip-shaped (approximately linear) beam that is random in the width direction (TD direction) and slightly parallel in the transport direction (MD direction). Furthermore, by adjusting the irradiation angle of the aforementioned beam, the tilt angle of the plate-shaped region 71 can also be adjusted.

[0260] Furthermore, the aforementioned active energy rays refer to active energy rays containing energy quanta within electromagnetic waves or charged particle beams; specifically, examples include ultraviolet light and electron beams. Among active energy rays, ultraviolet light is particularly preferred as it is easy to manipulate and readily forms the desired regular internal structure.

[0261] When ultraviolet light is used as an active energy ray, the peak illuminance on the coating surface is preferably set to 0.1~200 mW / cm² as the irradiation condition. 2 Furthermore, it is preferable to set the cumulative light intensity on the coating surface to 5~300 mJ / cm. 2 Furthermore, the relative movement speed of the active energy ray source relative to the irradiated object is preferably 0.1 to 10 m / min.

[0262] Furthermore, from the perspective of achieving more reliable curing, it is preferable to irradiate with conventional active energy rays (active energy rays or scattered light that have not been converted into parallel light, ribbon light, etc.) after performing curing using the aforementioned ribbon light.

[0263] 4. Weather-resistant layer In the third embodiment, the weather-resistant layer 8 is not limited in material or composition as long as it contains an ultraviolet absorber. As described above, examples of the weather-resistant layer 8 include at least one of the following: a coating containing an ultraviolet absorber, an adhesive layer containing an ultraviolet absorber, an adhesive layer containing an ultraviolet absorber, and a substrate containing an ultraviolet absorber. Furthermore, from the perspective of SDGs, the materials constituting the weather-resistant layer 8 can be materials with high bio-based content, materials that are recyclable or reusable, or materials that have been recycled or reused.

[0264] (1) Coating In the third embodiment, when the weather-resistant layer 8 is a coating, the coating is preferably laminated on the side of the light-transmitting imaging section 2 opposite to the display section 1, and serves to protect the outermost surface of the laminate composed of the light-transmitting imaging section 2, etc. Specific examples of coatings include hard coatings, self-healing layers, etc.

[0265] The coating is preferably formed by curing a coating composition containing, for example, an active energy ray curable component, the aforementioned ultraviolet absorber, and other additives. The ultraviolet absorber described above can be used here.

[0266] (2)Adhesive layer When the weather-resistant layer 8 in the third embodiment is an adhesive layer, the adhesive layer is preferably used to ensure that the components constituting the aerial imaging devices 10e, 10f, and 10g are tightly bonded to each other. There are no particular limitations on the adhesive used to form the adhesive layer; for example, the adhesives described in the first and second embodiments can be used.

[0267] (3) Adhesive layer When the weather-resistant layer 8 in the third embodiment is an adhesive layer, the adhesive layer is preferably used to fix the components constituting the aerial imaging devices 10e, 10f, and 10g to each other.

[0268] The adhesive constituting the adhesive layer is not particularly limited. From the perspective of easy and clear viewing of aerial images, the adhesive is preferably transparent. The material constituting the adhesive layer is not particularly limited; for example, a material composed of a thermoplastic resin and a low molecular weight thermosetting adhesive component, or a material composed of a B-stage (semi-cured) thermosetting adhesive component, etc., can be used. Among these, materials containing both a thermoplastic resin and a thermosetting adhesive component are preferred as constituting the adhesive layer. Furthermore, the aforementioned ultraviolet absorber can be used as an ultraviolet absorber.

[0269] (4) Substrate When the weather-resistant layer 8 in the third embodiment is a substrate, the substrate may, for example, be disposed on the outermost surface of the laminate composed of the light-transmitting imaging part 2 and the like on the viewer side, and have the function of protecting the laminate, or it may also have the function of supporting other components constituting the aerial imaging devices 10e, 10f, 10g.

[0270] The aforementioned substrate can also be formed from a material containing a main agent and a UV absorber. While not particularly limited, the main agent is preferably a resin, and especially preferably a transparent resin. Furthermore, the aforementioned UV absorber can be used as the UV absorber.

[0271] 5. Other constituent elements The aerial imaging devices 10e, 10f, and 10g of the third embodiment may also include components other than the display unit 1, light diffusion control unit 7, light-transmitting imaging unit 2, and weather-resistant layer 8. In particular, the aerial imaging device 10 of the third embodiment preferably includes a frame for fixing and storing the display unit 1, light diffusion control unit 7, light-transmitting imaging unit 2, and weather-resistant layer 8 in a predetermined position.

[0272] The material, shape, and size of the frame can be appropriately selected according to the application and purpose. In particular, the frame is preferably made of a light-shielding material, which can prevent light from the display unit 1 from accidentally leaking to the outside, and at the same time prevent external light from unintentionally entering the light path from the display unit 1 to the light diffusion control unit 7, etc.

[0273] 6. The positional relationship of each element For the aerial imaging devices 10e, 10f, and 10g in the third embodiment, the same as in the first embodiment, it is preferred to satisfy the condition of "the angle of the acute angle formed by the first direction and the second direction".

[0274] Furthermore, when the aerial imaging devices 10e, 10f, and 10g of the third embodiment have the aforementioned retrotransmission optical element with a dihedral reflector array structure, or a retrotransmission optical element consisting of two layers having multiple reflective surfaces stacked together as a light-transmitting imaging unit 2, in the same manner as the first embodiment, it is preferable to configure the elements of the aerial imaging devices 10c and 10d in a manner that simultaneously satisfies "(Condition 1)" and "(Condition 2)".

[0275] 7. Physical properties of aerial imaging devices For the aerial imaging devices 10e, 10f, and 10g of the third embodiment, a laminate comprising a light-transmitting imaging unit 2, a light diffusion control unit 7, and a weather-resistant layer 8 is provided relative to a black plate according to CIE1976L. a b The color b specified in the color system (Initial b) The absolute value of ) is preferably 1.0 or less, more preferably 0.7 or less, particularly preferably 0.5 or less, and even more preferably 0.3 or less. This chromaticity b (Initial b) The lower limit of the absolute value of ) is preferably 0, but it can usually be 0.01 or higher, or 0.1 or higher.

[0276] Furthermore, after irradiating the above-mentioned laminate with ultraviolet light for 1000 hours at 63±3℃ and 50%RH, its performance relative to the black plate was determined by CIE1976L. a b The color b specified in the color system Compared with the initial b mentioned above The absolute value of the difference Δb The preferred value is 0.01 to 1.5, particularly preferred value is 0.05 to 1.0, and even more preferred value is 0.1 to 0.6.

[0277] Furthermore, after irradiating the above-mentioned laminate with ultraviolet light for 2000 hours at 63±3℃ and 50%RH, its performance relative to the black plate was determined by CIE1976L. a b The color b specified in the color system Compared with the initial b mentioned above The absolute value of the difference Δb The preferred value is 0.01 to 1.5, more preferably 0.05 to 1.2, particularly preferably 0.08 to 0.9, and even more preferably 0.1 to 0.6.

[0278] Furthermore, after irradiating the above-mentioned laminate with ultraviolet light for 3000 hours at 63±3℃ and 50%RH, its performance relative to the black plate was determined by CIE1976L. a b The color b specified in the color system Compared with the initial b mentioned above The absolute value of the difference Δb The preferred value is 0.01 to 1.5, more preferably 0.05 to 1.2, particularly preferably 0.08 to 1.0, further preferably 0.1 to 0.9, and especially preferably 0.2 to 0.8.

[0279] By meeting the above conditions, the aerial imaging devices 10e, 10f, and 10g in the third embodiment are more likely to possess superior weather resistance. Additionally, chromaticity b... and Δb The details of the respective determination methods are as described in the experiments below.

[0280] 8. Manufacturing method of aerial imaging device The manufacturing method of the aerial imaging devices 10e, 10f, and 10g in the third embodiment is not particularly limited. For example, after preparing the display unit 1, the light diffusion control unit 7, the light-transmitting imaging unit 2, and the weather-resistant layer 8 respectively, the display unit 1 can be set at a predetermined position in the frame, and a laminate of the light diffusion control unit 7, the light-transmitting imaging unit 2, and the weather-resistant layer 8 can be set to obtain the aerial imaging devices 10e, 10f, and 10g.

[0281] 9. How to use aerial imaging devices The aerial imaging devices 10e, 10f, and 10g of the third embodiment can be used as display devices for displaying arbitrary images, videos, etc., in the air. Their specific usage is not limited, and they can be used in the same manner as conventionally known display devices.

[0282] [Laminated structure of the third implementation scheme] The third embodiment of the laminate is a structure that omits the display unit 1 from the aforementioned aerial imaging devices 10e, 10f, and 10g. Specifically, the third embodiment's laminate comprises a light-transmitting imaging unit 2 that images light incident from one side of the surface onto the other side, and a single-sided light diffusion control unit 7 laminated within the light-transmitting imaging unit 2. Furthermore, the laminate includes a weather-resistant layer containing an ultraviolet absorber, or the light diffusion control unit 7 contains an ultraviolet absorber. Details regarding the composition and structure of the light diffusion control unit 7, the light-transmitting imaging unit 2, and the weather-resistant layer 8 are as described above.

[0283] The laminated body of the third embodiment can be obtained by laminating the light diffusion control unit 7, the light-transmitting imaging unit 2, and the weather-resistant layer 8 after preparing them separately. Furthermore, the laminated body of the third embodiment can be used to form the aerial imaging devices 10e, 10f, and 10g of the third embodiment. That is, by arranging the laminated body of the third embodiment at predetermined positions on the display unit 1, the aerial imaging devices 10e, 10f, and 10g of the third embodiment can be obtained.

[0284] Furthermore, in this specification, when denoted as "X~Y" (where X and Y are arbitrary numbers), unless otherwise specified, it includes the meaning of "X or more and Y or less," and also includes the meaning of "preferably greater than X" or "preferably less than Y." Additionally, when denoted as "X or more" (where X is any number), unless otherwise specified, it includes the meaning of "preferably greater than X," and when denoted as "Y or less" (where Y is any number), unless otherwise specified, it also includes the meaning of "preferably less than Y."

[0285] The embodiments described above are provided for the purpose of understanding the present invention and are not intended to limit the present invention. Therefore, the elements disclosed in the above embodiments are intended to include all design changes, equivalents, etc., that fall within the scope of the present invention. Example

[0286] The present invention will be further described in detail below through examples, etc., but the scope of the present invention is not limited to these examples, etc.

[0287] [Example of the first implementation scheme] [Example 1-1] A coating solution of an antistatic composition was prepared by mixing 100 parts by weight (solid content conversion value; the same below) of pentaerythritol triacrylate and pentaerythritol tetraacrylate (manufactured by SHIN-NAKAMURA CHEMICAL CO, LTD., product name "NK ESTER A-TMM-3L") as polyfunctional acrylate monomers, 25 parts by weight of dimethylaminoethyl methacrylate (quaternary ammonium salt, manufactured by Kyoisha Chemical Co., Ltd., product name "Light Ester DQ-100") as an antistatic agent, and 3 parts by weight of α-hydroxyalkylphenyl ketone as a photopolymerization initiator.

[0288] The antistatic composition obtained above was coated onto one side of a polyethylene terephthalate film (manufactured by TOYOBO CO., LTD., product name "COSMOSHINE A4360", thickness: 125 μm) as a substrate using a Mayer rod #14. The resulting coating was then heated and dried at 70°C for 1 minute, followed by curing under UV irradiation conditions 1 (manufactured by Yuasa International Ltd.) using a nitrogen-purged miniature UV irradiation device. This resulted in a coating film with a thickness of 5 μm formed on the substrate.

[0289] <Ultraviolet Irradiation Condition 1> • Light source: High-pressure mercury lamp • Lamp power: 2kW • Conveyor belt speed: 13.0 m / min Illuminance: 300mW / cm² 2 • Light intensity: 240 mJ / cm 2 Nitrogen purging: None

[0290] [Examples 1-2] Coating solution A was prepared by mixing 42 parts by mass of amorphous silica with an average particle size of 50 nm, 28 parts by mass of pentaerythritol tetraacrylate as a polyfunctional acrylate monomer, and 0.9 parts by mass of α-aminoalkyl phenyl ketone as a photopolymerization initiator using propylene glycol monomethyl ether (PGM).

[0291] The coating solution A obtained above was applied to one side of a triacetyl cellulose (TAC) membrane (manufactured by Konica Minolta, Inc., product name "KC8UAW", thickness: 80 μm) as the substrate using a Mayer rod #14. The resulting coating was then heated and dried at 70°C for 1 minute, followed by curing under UV irradiation conditions 1 using a nitrogen-purged miniature UV irradiation device (manufactured by Yuasa International Ltd.) to form a coating layer (Layer 1). This resulted in a coating film with a thickness of 5 μm (Layer 1) formed on the substrate.

[0292] The coating solution B of the antistatic composition was obtained by mixing 27 parts by weight of indium tin oxide with an average particle size of 50 nm as an antistatic agent, 7.7 parts by weight of pentaerythritol triacrylate and pentaerythritol tetraacrylate (manufactured by SHIN-NAKAMURA CHEMICAL CO, LTD., product name "NK Ester A-TMM-3L") as polyfunctional acrylate monomers and 0.2 parts by weight of α-aminoalkyl phenyl ketone as a photopolymerization initiator.

[0293] Next, the coating liquid B of the antistatic composition obtained above was applied to the coating (first layer) side of the coating film consisting of the substrate and the coating layer (first layer) using Mayer rod #4. The resulting coating film was heated and dried at 50°C for 1 minute, then cured by purging a small ultraviolet irradiation device (manufactured by Yuasa International Ltd.) with nitrogen and irradiating with ultraviolet light under the following ultraviolet irradiation conditions 2, thus forming the coating layer (second layer). Thus, a coating film consisting of the substrate, the coating layer (first layer), and a 0.1 μm thick coating layer (second layer) was obtained.

[0294] <Ultraviolet Irradiation Condition 2> • Light source: High-pressure mercury lamp • Lamp power: 2kW • Conveyor belt speed: 13.0 m / min Illuminance: 300mW / cm² 2 • Light intensity: 240 mJ / cm 2 • Nitrogen purging: Yes (Oxygen concentration: below 500 ppm)

[0295] Further, a 1:1 mixture of cyclohexane and MIBK was used to mix 10 parts by mass of a light-curable multifunctional urethane acrylate resin (manufactured by ARAKAWA CHEMICAL INDUSTRIES, LTD., product name "BEAMSET575CB"), 36.6 parts by mass of a hollow silica dispersion (manufactured by JGC Catalysts and Chemicals Ltd., product name "Thrulya 5320", solids concentration 20.5%), and 0.2 parts by mass of α-aminoalkyl phenyl ketone as a polymerization initiator to obtain coating solution C.

[0296] Next, the coating liquid C obtained above was applied to the coating (second layer) side of the coating film consisting of the substrate, the coating layer (first layer), and the coating layer (second layer) using Mayer rod #4. The resulting coating film was heated and dried at 90°C for 1 minute, then cured by purging a small ultraviolet irradiation device (manufactured by Yuasa International Ltd.) with nitrogen and irradiating it with ultraviolet light under the aforementioned ultraviolet irradiation conditions 2, thus forming the coating layer (third layer). Thus, a coating film consisting of a substrate, the coating layer (first layer), the coating layer (second layer), and a 0.1 μm thick coating layer (third layer) was obtained.

[0297] [Examples 1-3] A coating solution for the antistatic composition was prepared by mixing 27 parts by mass of indium tin oxide (with an average particle size of 50 nm) as an antistatic agent, 7.7 parts by mass of pentaerythritol tetraacrylate (PETA) as a polyfunctional acrylate monomer, and 0.2 parts by mass of α-aminoalkyl phenyl ketone as a photopolymerization initiator using a mixture of ethanol and IBA in a 7:5 ratio.

[0298] The antistatic composition obtained above was coated onto one side of a polyethylene terephthalate film (manufactured by TOYOBO CO., LTD., product name "COSMOSHINE A4360", thickness: 125 μm) as a substrate using Mayer rod #14. The resulting coating was then heated and dried at 50°C for 1 minute, followed by curing under UV irradiation conditions 2 described above using a nitrogen-purged miniature UV irradiation device (manufactured by Yuasa International Ltd.) to form a coating film. This resulted in a coating film with a thickness of 2 μm formed on the substrate.

[0299] [Comparative Example 1-1] A polyethylene terephthalate film (manufactured by LINTEC Corporation, product name "HA149-125G1C") with a surface coating was prepared as the coating of Comparative Example 1-1. Furthermore, this coating did not contain a layer containing an antistatic agent.

[0300] [Experimental Example 1-1] (Determination of Surface Resistivity) For the coatings obtained in the examples and comparative examples, the surface resistivity of the coatings was measured using a resistivity meter (manufactured by Nittoseiko Analytech Co., Ltd., product name "Hi-Resta-UX MCP-HT800") at an applied voltage of 100V, based on JIS C2139-3. The results are shown in Table 1.

[0301] [Experimental Examples 1-2] (Evaluation of Antistatic Properties) The coatings obtained in the examples and comparative examples were rubbed with flannel cloth for 10 seconds to induce triboelectric charging. Then, the triboelectrically charged coatings were brought close to granulated expanded polystyrene to evaluate whether expanded polystyrene would adhere to the coatings. The results are shown in Table 1.

[0302] [Experimental Examples 1-3] (Evaluation of the visibility of aerial images) The substrate film side of the coating film manufactured in the examples and comparative examples is stacked on a single side of a retrotransmission optical element (manufactured by Asukanet Co., Ltd., product name "ASKA3D-200NT", 200mm long × 200mm wide × 6.3mm thick) which serves as a light-transmitting imaging part and consists of two layers of layers with multiple reflective surfaces.

[0303] Next, the obtained laminate of the coating and the light-transmitting imaging section is placed in a predetermined frame with the main surface of the laminate horizontal and the side of the light-transmitting imaging section facing down. Furthermore, as a display unit, a laptop screen is placed in the frame with its surface facing the laminate of the coating and the light-transmitting imaging section.

[0304] When the above-mentioned display unit is installed, the angle formed between the display surface of the display unit and the main surface of the light-transmitting imaging unit is 45°. In addition, the above-mentioned frame is light-shielded so that the light irradiated by the display unit will not leak out to the outside from outside the coating and the light-transmitting imaging unit.

[0305] Thus, an aerial imaging device is obtained by arranging the coating, the light-transmitting imaging unit, and the display unit within a frame.

[0306] Next, rub the coating surface with flannel cloth for 10 seconds to tribocharge it. Then, bring the tribocharged coating close to the granulated expanded polystyrene foam.

[0307] Then, an image measuring 70mm in length and 100mm in width was displayed on the display unit to generate an aerial image, and the visibility of the aerial image was observed visually. The results are shown in Table 1. 〇…The expanded polystyrene was not attached, and the aerial images could be viewed very well. ×... is covered with expanded polystyrene, making it difficult to see aerial images.

[0308] [Table 1]

[0309] As shown in Table 1, the coating obtained in the embodiment has excellent antistatic properties, and when used to construct an aerial imaging device, it can effectively view aerial images.

[0310] [Example of the second implementation scheme] [Preparation Example 2-1] (Adhesive layer A, total transmittance ≥90% and <100%) 70 parts by mass of 2-ethylhexyl acrylate, 15 parts by mass of methyl methacrylate, and 15 parts by mass of 2-hydroxyethyl acrylate were copolymerized by solution polymerization to obtain a (meth)acrylate polymer. The weight-average molecular weight (Mw) of the (meth)acrylate polymer was determined by the method described below, and the result was 800,000.

[0311] 100 parts by weight of the obtained (meth)acrylate polymer, 0.2 parts by weight of the isocyanate-based crosslinking agent (manufactured by Mitsui Chemicals, Inc., product name "Takenate D-101E"), and 0.2 parts by weight of 3-epoxypropoxypropyltrimethoxysilane as a silane coupling agent were mixed and stirred thoroughly, and then diluted with methyl ethyl ketone to obtain a coating solution of the adhesive composition.

[0312] The obtained coating solution was applied to the peeling surface of a heavy-release sheet (thickness: 38 μm) that had been peeled on one side of a polyethylene terephthalate film using a silicone-based release agent using a doctor blade coater. The sheet was then dried in a drying oven at 90°C for 1 minute to obtain the coating.

[0313] Next, a light-release sheet (thickness: 38 μm) that has undergone single-sided release treatment of the polyethylene terephthalate film using a silicone-based release agent is attached to the side of the above coating opposite to the heavy release sheet. Then, the coating is cured at 23°C and 50%RH for 7 days to form adhesive layer A.

[0314] Thus, an adhesive sheet is obtained by sequentially stacking a heavy release sheet, a 25μm thick adhesive layer A, and a light release sheet.

[0315] For the adhesive layer A formed in the above manner, the total transmittance (%) was measured using a haze meter (manufactured by NIPPON DENSHOKU INDUSTRIES Co., Ltd., product name "SH-7000") based on JIS K7361-1:1997 and ASTM D 1003. The result was above 90% and less than 100%.

[0316] Furthermore, the aforementioned weight-average molecular weight (Mw) is the weight-average molecular weight converted from standard polystyrene determined using gel permeation chromatography (GPC) under the following conditions (GPC determination). <Measurement Conditions> • Measuring device: HLC-8320, manufactured by Tosoh Corporation • GPC column (passes through in the following order): Manufactured by Tosoh Corporation TSK gel superH-H TSK gel superHM-H TSK gel superH2000 • Solvent for determination: Tetrahydrofuran • Measurement temperature: 40℃

[0317] [Preparation Example 2-2] (Adhesive layer B, total transmittance 80%) 100 parts by weight of the (meth)acrylate polymer described in Preparation Example 1, 0.2 parts by weight of an isocyanate-based crosslinking agent (manufactured by Mitsui Chemicals, Inc., product name "Takenate D-101E") as a crosslinking agent, 0.30 parts by weight of a carbon black pigment (C1) as a coloring component, and 0.2 parts by weight of 3-epoxypropoxypropyltrimethoxysilane as a silane coupling agent were mixed and stirred thoroughly. The mixture was then diluted with methyl ethyl ketone to obtain a coating solution of the adhesive composition.

[0318] In addition to using the coating solution of the adhesive composition described above, an adhesive sheet was obtained by sequentially layering a heavy release sheet, an adhesive layer B with a thickness of 30 μm, and a light release sheet in the same manner as in Preparation Example 2-1.

[0319] In addition, for the carbon black pigment (C1) with the aforementioned coloring components, based on JIS K7136:2000, the haze value (%) of the solution obtained by diluting it 10,000 times with ethyl acetate was measured using a haze meter (manufactured by NIPPON DENSHOKU INDUSTRIES Co., Ltd., product name "SH-7000", optical path length 10mm). Based on these measurements, the difference between the haze value at 780nm and the haze value at 380nm was calculated; the average haze value, which is the average of the haze values ​​at 780nm and 380nm, was calculated; and the standard deviation of the haze values ​​at 5nm intervals within the 380nm~780nm wavelength region was calculated. The results are shown in Table 1.

[0320] In addition, using a haze meter (manufactured by NIPPON DENSHOKU INDUSTRIES Co., Ltd., product name "SH-7000"), the total transmittance (%) of the formed adhesive layer B was measured according to JIS K7361-1:1997 and ASTM D 1003, and the result was 80%.

[0321] [Preparation Examples 2-3] (Adhesive layer C, total transmittance 50%) Except that the amount of coloring component was set to 0.94 parts by mass, the coating solution of the adhesive composition was obtained in the same manner as in Preparation Example 2-2.

[0322] In addition to using the coating solution of the adhesive composition described above, an adhesive sheet was obtained by sequentially layering a heavy release sheet, an adhesive layer C with a thickness of 30 μm, and a light release sheet in the same manner as in Preparation Example 2-1.

[0323] In addition, using a haze meter (manufactured by NIPPON DENSHOKU INDUSTRIES Co., Ltd., product name "SH-7000"), the total transmittance (%) of the formed adhesive layer C was measured according to JIS K7361-1:1997 and ASTM D 1003, and the result was 50%.

[0324] [Preparation Examples 2-4] (Adhesive layer D, total transmittance 30%) Except that the amount of coloring component was set to 1.63 parts by mass, the coating solution of the adhesive composition was obtained in the same manner as in Preparation Example 2-2.

[0325] In addition to using the coating solution of the adhesive composition described above, an adhesive sheet was obtained by sequentially layering a heavy release sheet, an adhesive layer D with a thickness of 30 μm, and a light release sheet in the same manner as in Preparation Example 2-1.

[0326] In addition, using a haze meter (manufactured by NIPPON DENSHOKU INDUSTRIES Co., Ltd., product name "SH-7000"), the total transmittance (%) of the formed adhesive layer D was measured according to JIS K7361-1:1997 and ASTM D 1003, and the result was 30%.

[0327] [Preparation Examples 2-5] (Light Diffusion Control Unit) 1. Modulation of the composition used in the light diffusion control section A composition for light diffusion control was obtained by adding 60 parts by mass (conversion value of solid components; the same applies below) of polyether urethane methacrylate with a weight average molecular weight of 9,900 as a low refractive index component, 60 parts by mass of o-phenylphenoxyethoxyethyl acrylate with a molecular weight of 268 as a high refractive index component, and 8 parts by mass of 2-hydroxy-2-methyl-1-phenylpropane-1-one as a photopolymerization initiator, and heating and mixing at 80°C. The polyether urethane methacrylate was obtained by reacting polypropylene glycol, isophorone diisocyanate and 2-hydroxyethyl methacrylate.

[0328] 2. Formation of the light diffusion control section The obtained light diffusion control portion is coated with the composition onto a polyethylene terephthalate film process sheet A (thickness: 50 μm), which serves as a process sheet, thereby forming a coating film. Thus, a laminate consisting of the coating film and process sheet A is obtained.

[0329] Next, the obtained laminate is placed on a conveyor belt. At this time, the coated surface of the laminate is positioned upwards, and the long side of process sheet A is parallel to the conveyor belt's transport direction. Then, an ultraviolet irradiation device (manufactured by EYE GRAPHICS COMPANY, product name "ECS-4011GX") with a focusing mirror attached to a linear high-pressure mercury lamp is installed on the conveyor belt carrying the laminate. This device can irradiate a single point on the object with ultraviolet light scattered in a band (approximately linear) pattern. Furthermore, when installing the device, the ultraviolet irradiation device is positioned such that the long side of the high-pressure mercury lamp is orthogonal to the conveyor belt's transport direction.

[0330] Furthermore, when viewed from the long side of the high-pressure mercury lamp, the irradiation angle of the ultraviolet light irradiating the laminate, using the normal to the surface of the laminate as a reference, is set to -5°. Here, the irradiation angle refers to the acute angle formed by the ultraviolet light relative to the normal to the laminate surface and the ultraviolet light when irradiating the downstream side of the conveyor belt, with the position directly below the high-pressure mercury lamp in the laminate as a reference; when irradiating the upstream side of the conveyor belt, the acute angle formed by the ultraviolet light and the normal to the laminate surface is recorded as a negative sign.

[0331] Then, the conveyor belt is started, moving the laminate at a speed of 1.0 m / min while maintaining a peak illuminance of 2.5 mW / cm² on the coating surface. 2 The cumulative light intensity is 40.0 mJ / cm². 2 The coating is cured by irradiation with ultraviolet light under certain conditions (for convenience, this curing is sometimes referred to as "one-time curing").

[0332] Next, a polyethylene terephthalate film (thickness: 38 μm) is laminated onto the coating side of the laminate to obtain a laminate consisting of step sheet A, the aforementioned coating, and step sheet B. Then, while moving the laminate at a speed of 1.0 m / min, a peak illuminance of 190 mW / cm² is applied. 2 The cumulative light intensity is 180 mJ / cm². 2 Under the specified conditions, ultraviolet light (scattered light) is irradiated onto the coating film through the process sheet B, thereby curing the coating film in the laminate (for convenience, this curing is sometimes referred to as "secondary curing"). Furthermore, the aforementioned peak illuminance and cumulative light intensity are values ​​obtained by placing a UV illuminance meter (manufactured by EYE GRAPHICS COMPANY, product name "EYE UV cumulant illuminance meter UVPF-A1") equipped with a light receiver at the location of the coating film and measuring the values.

[0333] Through the above-mentioned primary and secondary curing processes, the coating film is fully cured, becoming the light diffusion control section. Thus, a laminate is obtained by sequentially stacking process sheet A, the 140μm thick light diffusion control section, and process sheet B.

[0334] Furthermore, when performing microscopic observation of the cross-section of the formed light diffusion control section, it was confirmed that... Figure 6 As shown, a louver structure is formed by multiple plate-shaped regions 61 arranged in parallel at predetermined intervals inside the light diffusion control unit. The acute angle formed by the main surface of the louver structure and the normal of the light diffusion control unit is 3.3°.

[0335] [Examples 2-1 to 2-7 and Comparative Examples 2-1 to 2-2] Using the adhesive sheets prepared in Examples 2-1 to 2-4, a laminate with the layered structure shown in Table 2 is manufactured. That is, a release sheet is appropriately peeled off from the manufactured adhesive sheet, and the components are bonded together using an adhesive layer, thereby forming the laminate shown in Table 2.

[0336] In addition, the details of the abbreviations and other symbols recorded in Table 2 are as follows. AR: Anti-reflective film (manufactured by NOF CORPORATION, product name "AirLike 1202UV-50", thickness: 75μm) Transmitting imaging section: Inverse transmission optical element (manufactured by Asukanet Co., Ltd., product name "ASKA3D-200NT", 200mm long × 200mm wide × 6.3mm thick) PET38: 38μm thick polyethylene terephthalate film Light diffusion control unit: The light diffusion control unit manufactured as shown in the aforementioned preparation example 5. PET50: 50μm thick polyethylene terephthalate film PET25: 25μm thick polyethylene terephthalate film

[0337] [Experimental Example 2-1] (Determination of Optical Properties) Using a haze meter (manufactured by NIPPON DENSHOKU INDUSTRIES Co., Ltd., product name "SH-7000"), the total transmittance (%) and haze value (%) of the laminates prepared in the examples and comparative examples were measured according to JIS K7361-1:1997 and ASTM D 1003. The results are shown in Table 3.

[0338] [Experimental Example 2-2] (Determination of Color Difference) For the laminates obtained in the examples and comparative examples, a spectrophotometer (manufactured by NIPPON DENSHOKUINDUSTRIES Co., Ltd., product name "SE6000") was used to measure the reflected light of incident light from the viewer's side of the laminate, according to CIE1976L. a b The lightness L specified by the color system chromaticity a and chromaticity b The results are shown in Table 3.

[0339] Furthermore, as a sample for the frame, the lightness L of the surface of a black board (manufactured by Mitsubishi Chemical Corporation, product name "Acrylite L502 Black") was measured in the same manner as described above. chromaticity a and chromaticity b As a result, the brightness L of the black panel... chromaticity a and chromaticity b The values ​​are 3.3, 0.1, and 0.1 respectively.

[0340] Next, based on the following calculation formula (1), the laminate obtained in the embodiments and comparative examples relative to the black plate is calculated according to CIE1976L. a b The color difference ΔE specified by the color system The results are shown in Table 3.

[0341] [Mathematical Expression 1]

[0342] In addition, in equation (1), L 2. a 2 and b 2 represents the lightness L of the layered body. chromaticity a and chromaticity b L 3. a 3 and b 3 represents the lightness (L) of the black panel. chromaticity a and chromaticity b .

[0343] [Experimental Example 2-3] (Evaluation of the visibility of aerial images) The laminated body obtained in the embodiments and comparative examples is disposed within a predetermined frame with its main surface horizontal and the viewer's side facing upward. Furthermore, a laptop screen is disposed within the frame as a display unit, facing the laminated body. Thus, an aerial imaging device is obtained.

[0344] Furthermore, when the display unit is installed, the angle between the display surface of the display unit and the main surface of the light-transmitting imaging unit is 45°. In addition, the frame is light-shielded to prevent light irradiated by the display unit from leaking out from outside the coating and the light-transmitting imaging unit.

[0345] Next, an image measuring 70mm in length and 100mm in width was displayed on the display unit to generate an aerial image, and the visibility of the aerial image was observed visually. The visibility of the aerial image was evaluated based on the following criteria. The results are shown in Table 3. ◎…The aerial images can be seen very brightly. …The aerial images can be seen clearly. …Aerial images can only be seen in the dark.

[0346] [Experimental Examples 2-4] (Evaluation of Appearance Compatibility) For the aerial imaging device fabricated in Test Examples 2-3, the appearance of the exposed surface of the laminate from the frame and the area surrounding the exposed surface of the frame were visually confirmed. The appearance compatibility was evaluated based on the following criteria. The results are shown in Table 2. ◎…The two parts are very close and harmonious. The two parts are similar and coordinated to a certain extent. The two parts are clearly dissimilar and uncoordinated.

[0347] [Table 2]

[0348] [Table 3]

[0349] As shown in Table 3, the aerial photography device obtained in the embodiments can display aerial images well and has excellent aesthetic harmony. Furthermore, a comparison of the embodiments shows that when the coloring layer is closer to the viewer's side than the light-transmitting imaging section, the aesthetic harmony tends to improve. Moreover, compared to embodiments 2-2 and 2-3, embodiment 2-1 has higher overall light transmittance and better visibility of aerial images. Furthermore, compared to embodiment 2-1, embodiment 2-7 also has a coloring layer on the display side, ΔE It becomes smaller, has lower total light transmittance, and poorer visibility, but has better appearance coordination.

[0350] [Example of the Third Implementation Scheme] [Example 3-1] 1. Modulation of the composition used in the light diffusion control section For 40 parts by weight (conversion value for solid content; the same applies below) of polyether urethane methacrylate with a weight average molecular weight of 9,900 as a low refractive index component, 60 parts by weight of o-phenylphenoxyethoxyethyl acrylate with a molecular weight of 268 as a high refractive index component, 8.0 parts by weight of 2-hydroxy-2-methyl-1-phenylpropane-1-one as a photopolymerization initiator, 0.05 parts by weight of an acrylic leveling agent (manufactured by BYK Japan KK, product name "BYK-361N") as a leveling agent, 0.08 parts by weight of a benzotriazole UV absorber (manufactured by BASF JAPAN, product name "Tinuvin 384-2") as a UV absorber, and 0.5 parts by weight of a hindered amine light stabilizer (manufactured by BASF JAPAN, product name "Tinuvin") as a light stabilizer, the following additives are used: After 292”), the mixture is heated and mixed at 80°C to obtain a composition for light diffusion control, wherein the polyether urethane methacrylate is obtained by reacting polypropylene glycol, isophorone diisocyanate and 2-hydroxyethyl methacrylate.

[0351] Here, the aforementioned weight-average molecular weight (Mw) is the weight-average molecular weight converted from standard polystyrene determined using gel permeation chromatography (GPC) under the following conditions (GPC determination). <Measurement Conditions> • Measuring device: HLC-8320, manufactured by Tosoh Corporation • GPC column (passes through in the following order): Manufactured by Tosoh Corporation TSK gel superH-H TSK gel superHM-H TSK gel superH2000 • Solvent for determination: Tetrahydrofuran • Measurement temperature: 40℃

[0352] 2. Formation of the light diffusion control section The obtained light diffusion control component is coated with the composition onto a polyethylene terephthalate film sheet A (manufactured by LINTEC Corporation, product name "SP-PET381130", thickness: 50 μm), which serves as the process sheet, thereby forming a coating film. This results in a laminate consisting of the coating film and the process sheet.

[0353] Next, the resulting laminate is placed on a conveyor belt. At this point, the coated side of the laminate is facing upwards, and the long side of the workpiece is parallel to the conveyor belt's transport direction. Then, an ultraviolet irradiation device (manufactured by EYE GRAPHICS COMPANY, product name "ECS-4011GX") with a focusing mirror attached to a linear high-pressure mercury lamp is installed on the conveyor belt carrying the laminate. This device can irradiate a single point on the object with ultraviolet light scattered in a band (approximately linear) pattern. Furthermore, when installing this device, the long side of the high-pressure mercury lamp is positioned orthogonally to the conveyor belt's transport direction.

[0354] Furthermore, when viewed from the long side of the high-pressure mercury lamp, the irradiation angle of the ultraviolet light irradiating the laminate, using the normal to the surface of the laminate as a reference, is set to -5°. Here, the irradiation angle refers to the acute angle formed by the ultraviolet light relative to the normal to the laminate surface and the ultraviolet light when irradiating the downstream side of the conveyor belt, with the position directly below the high-pressure mercury lamp in the laminate as a reference; when irradiating the upstream side of the conveyor belt, the acute angle formed by the ultraviolet light and the normal to the laminate surface is recorded as a negative sign.

[0355] Then, the conveyor belt is started, moving the laminate at a speed of 1.0 m / min while maintaining a peak illuminance of 2.5 mW / cm² on the coating surface. 2 The cumulative light intensity is 40.0 mJ / cm². 2 The coating is cured by irradiation with ultraviolet light under certain conditions (for convenience, this curing is sometimes referred to as "one-time curing").

[0356] Next, a polyethylene terephthalate film (thickness: 38 μm) is laminated onto the coating side of the laminate to form a process sheet B, thus obtaining a laminate formed by sequentially laminating process sheet A, the aforementioned coating, and process sheet B. Then, while moving the laminate at a speed of 1.0 m / min, a peak illuminance of 190 mW / cm² is applied. 2 The cumulative light intensity is 180 mJ / cm². 2 Under the specified conditions, ultraviolet light (scattered light) is irradiated onto the coating film through the process sheet B, thereby curing the coating film in the laminate (for convenience, this curing is sometimes referred to as "secondary curing"). Furthermore, the aforementioned peak illuminance and cumulative light intensity are values ​​obtained by placing a UV illuminance meter (manufactured by EYE GRAPHICS COMPANY, product name "EYE UV cumulant illuminance meter UVPF-A1") equipped with a light receiver at the location of the coating film and measuring the values.

[0357] Through the above-mentioned primary and secondary curing processes, the coating film is fully cured, becoming the light diffusion control section. Thus, a laminate is obtained by sequentially stacking process sheet A, the 165μm thick light diffusion control section, and process sheet B.

[0358] Furthermore, when performing microscopic observation of the cross-section of the formed light diffusion control section, it was confirmed that... Figure 10 As shown, a louver structure is formed by multiple plate-shaped regions 71 arranged in parallel at predetermined intervals. The acute angle formed by the main surface of the louver structure and the normal of the light diffusion control section is 5°.

[0359] 3. Formation of the adhesive layer A (meth)acrylate polymer was obtained by copolymerizing 67.2 parts by mass of 2-ethylhexyl acrylate, 5 parts by mass of methyl methacrylate, 8 parts by mass of methacrylic acid, 18 parts by mass of vinyl acetate, 0.4 parts by mass of acrylic acid, and 1.4 parts by mass of 4-hydroxybutyl acrylate using solution polymerization. The weight-average molecular weight (Mw) of the (meth)acrylate polymer was determined by the aforementioned method and found to be 820,000.

[0360] 100 parts by weight of the obtained (meth)acrylate polymer, 0.5 parts by weight of an isocyanate-based crosslinking agent (manufactured by Tosoh Corporation, product name "CoronateHX"), and 7.7 parts by weight of a triazine-based ultraviolet absorber (manufactured by BASF JAPAN, product name "Tinuvin 477") were mixed and stirred thoroughly, and then diluted with ethyl acetate to obtain a coating solution of the adhesive composition.

[0361] The obtained coating solution was applied to the peeling surface of a heavy-release sheet (thickness: 38 μm) that had been peeled on one side of a polyethylene terephthalate film using a silicone-based release agent using a doctor blade coater. The sheet was then dried in a drying oven at 90°C for 1 minute to obtain the coating.

[0362] Next, a light-release sheet (thickness: 38 μm) that has undergone single-sided release treatment of the polyethylene terephthalate film using a silicone-based release agent is attached to the side of the above coating opposite to the heavy release sheet. Then, the coating is cured at 23°C and 50%RH for 7 days to form an adhesive layer.

[0363] Thus, an adhesive sheet is obtained by sequentially stacking a heavy release sheet, a 13μm thick adhesive layer, and a light release sheet.

[0364] 4. Fabrication of Layered Bodies Using the light diffusion control unit manufactured in process 2, the adhesive sheet manufactured in process 3, and other components, manufacture... Figure 12 The laminated structure shown is a layered structure. Specifically, it is formed by appropriately peeling off release sheets from manufactured adhesive sheets and using adhesive layers to bond the components together. Figure 12 The layered structure shown.

[0365] in addition, Figure 12 The details of the abbreviations and other symbols recorded are as follows. AR: Anti-reflective film (manufactured by NOF CORPORATION, product name "AirLike 1202UV-50", thickness: 75μm) Adhesive layer: The adhesive layer obtained by removing the release liner from the adhesive sheet manufactured in step 3. Transmitting imaging section: Inverse transmission optical element (manufactured by Asukanet Co., Ltd., product name "ASKA3D-200NT", 200mm long × 200mm wide × 6.3mm thick) PET38: 38μm thick polyethylene terephthalate film Light diffusion control unit: The light diffusion control unit manufactured in process 2 PET50: 50μm thick polyethylene terephthalate film HC-PET: Hard coated film (manufactured by LINTEC Corporation, product name "OPTERIA H137-75", thickness: 78μm)

[0366] [Examples 3-2 to 3-6 and Comparative Example 3-1] Except for changing the composition of the light diffusion control unit to that shown in Table 4, it is formed in the same manner as in Example 3-1. Figure 12 The layered structure shown.

[0367] Furthermore, dipentaerythritol hexaacrylate (DPHA) was used as the multifunctional monomer in Examples 3-2. Additionally, "ADK STAB LA-81" used as a light stabilizer in Examples 3-3, etc., is a hindered amine light stabilizer (manufactured by ADEKA, product name "ADK STAB LA-81"). Further, octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (manufactured by ADEKA, product name "ADK STABAO-50") was used as the antioxidant in Examples 3-2, etc.

[0368] [Experimental Example 3-1](Δb) (determination) The laminations obtained in the examples and comparative examples were measured using a spectrophotometer (manufactured by NIPPON DENSHOKU INDUSTRIES Co., Ltd., product name "SH-7000"), in accordance with CIE 1976L. a b The color b specified in the color system Set this as "Initial Chromaticity b" ".

[0369] Furthermore, for the laminates of other embodiments and comparative examples, based on JIS A1439:2016, they were irradiated with ultraviolet light for 3000 hours using a Sunshine Weather Meter (SWOM) (manufactured by Suga Test Instruments Co., Ltd., product name "S80") at an atmosphere of 63±3℃ (blackboard temperature) and 50%RH. The colorimetric b was measured at 1000 hours, 2000 hours, and 3000 hours in the same manner as described above. For each of the three measured colorimetric values ​​b Subtract the initial chromaticity b The value of Δb The results are shown in Table 4.

[0370] [Experimental Example 3-2] (Evaluation of the visibility of aerial images) For the laminates obtained in the examples and comparative examples, in the same manner as in Test Example 3-1, based on JIS A1439:2016, they were irradiated with ultraviolet light for 3000 hours using a Sunlight Weathering Oven (SWOM) (manufactured by SugaTest Instruments Co., Ltd., product name "S80") in an atmosphere of 63±3℃ (blackboard temperature) and 50%RH, thereby preparing the ultraviolet-irradiated laminate. The main surface of this laminate was taken as horizontal and... Figure 12 The upper side of the device is positioned facing upwards within a defined frame. Furthermore, a laptop screen is mounted within the frame as a display unit, facing the aforementioned laminated structure. This results in an aerial imaging device.

[0371] Furthermore, when the display unit is installed, the angle between the display surface of the display unit and the main surface of the light-transmitting imaging unit is 45°. In addition, the frame is light-shielded to prevent light irradiated by the display unit from leaking out from outside the laminate.

[0372] Next, an image measuring 70mm in length and 100mm in width was displayed on the display unit to generate an aerial image, and the visibility of the aerial image was observed visually. The visibility of the aerial image was evaluated based on the following criteria. The results are shown in Table 4. Furthermore, for the laminates obtained in the embodiments and comparative examples, the laminates before ultraviolet irradiation all received an evaluation result of ◎. ◎…I couldn’t perceive any yellow tint in the aerial images at all. Although the aerial images appear slightly yellowish, it is not to the extent that it will cause problems in actual use. ×…It is obvious that there is a yellow tint in the aerial images.

[0373] [Table 4]

[0374] As shown in Table 4, the aerial photography device obtained in the embodiment does not produce a yellow tint even after the durability test, and the aerial images can be viewed well. Industrial applicability

[0375] The aerial imaging device of the present invention can be used as a display for showing aerial images, etc. Explanation of reference numerals in the attached figures

[0376] 10a, 10b, 10c, 10d, 10e, 10f, 10g: Aerial imaging device; 1: Display unit; 2: Light-transmitting imaging unit; 3: Antistatic layer; 3', 6', 7: Light diffusion control unit; 31, 61, 71: Plate-shaped area; 32, 62, 72: Area with relatively low refractive index; 4: Aerial image observation surface; 5: Observation point; 6: Coloring layer; 8: Weather-resistant layer.

Claims

1. An aerial imaging device comprising: a display unit, a light-transmitting imaging unit, and a functional layer. The display unit has a display surface, and light is emitted from the display surface. The light-transmitting imaging unit is disposed on the display surface side of the display unit and allows light to be transmitted, thereby forming an image at a position on the surface opposite to the display unit. The functional layer is stacked on the side of the display portion of the light-transmitting imaging portion or on the side of the light-transmitting imaging portion opposite to the display portion. The aerial imaging device is characterized in that... The functional layer is any one of the following: an antistatic layer containing an antistatic agent, a coloring layer containing a coloring component, and a light diffusion control unit. When the functional layer is the coloring layer, the laminate of the light-transmitting imaging part and the coloring layer relative to the black plate is determined by CIE1976L. a b The color difference ΔE specified by the color system The transmittance is 20 or less, and the total transmittance of the laminate is 10% or more and 100% or less. When the functional layer is the light diffusion control unit, the light diffusion control unit diffuses or transmits light incident into the light diffusion control unit according to its incident angle, and has a regular internal structure in the shape of louvers. The regular internal structure in the shape of louvers has multiple plate-shaped regions with relatively high refractive index in regions with relatively low refractive index, and the aerial imaging device further has a weather-resistant layer containing an ultraviolet absorber, or the light diffusion control unit contains an ultraviolet absorber.

2. The aerial imaging device according to claim 1, characterized in that, The functional layer is the antistatic layer. The antistatic layer is at least one of the following: a coating containing the antistatic agent, an adhesive layer containing the antistatic agent, a substrate containing the antistatic agent, and a light diffusion control part containing the antistatic agent. The light diffusion control unit diffuses or transmits light incident upon it according to its incident angle, and has a regular internal structure in the shape of louvers. This regular internal structure in the shape of louvers has multiple plate-like regions with relatively high refractive indices in regions with relatively low refractive indices.

3. The aerial imaging device according to claim 1, characterized in that, The functional layer is the antistatic layer. The display unit is configured such that the display surface is not parallel to one side of the light-transmitting imaging unit, and the antistatic layer are arranged together.

4. The aerial imaging device according to claim 2, characterized in that, The functional layer is the antistatic layer. The antistatic layer is the light diffusion control unit. When the direction perpendicular to the long side of the plate-shaped region and existing in the plane of the light diffusion control section opposite to the light-transmitting imaging section is defined as the first direction, Each of the plate-shaped regions is inclined in the first direction within the light diffusion control unit.

5. The aerial imaging device according to claim 1, characterized in that, The functional layer is the coloring layer. The coloring layer is an adhesive layer containing the coloring component.

6. The aerial imaging device according to claim 1, characterized in that, The functional layer is the coloring layer. The aerial imaging device includes a light diffusion control unit, which is stacked on the side of the light-transmitting imaging unit opposite to the display unit or on the side of the light-transmitting imaging unit opposite to the display unit. The light diffusion control unit diffuses or transmits light incident upon it according to its incident angle, and has a regular internal structure in the shape of louvers. This regular internal structure in the shape of louvers has multiple plate-like regions with relatively high refractive indices in regions with relatively low refractive indices.

7. The aerial imaging device according to claim 6, characterized in that, The light diffusion control unit contains coloring components. The aerial imaging device includes the light diffusion control unit as the coloring layer.

8. The aerial imaging device according to claim 1, characterized in that, The functional layer is the coloring layer. The display unit is configured such that the display surface is not parallel to one side of the light-transmitting imaging unit.

9. The aerial imaging device according to claim 6, characterized in that, When the direction perpendicular to the long side of the plate-shaped region and existing in the plane of the light diffusion control section opposite to the light-transmitting imaging section is defined as the first direction, Each of the plate-shaped regions is inclined in the first direction within the light diffusion control unit.

10. The aerial imaging device according to claim 1, characterized in that, The functional layer is the light diffusion control unit. The weather-resistant layer is disposed at at least one location: on the side of the light-transmitting imaging portion opposite to the light diffusion control portion, on the side of the light diffusion control portion opposite to the light-transmitting imaging portion, and between the light-transmitting imaging portion and the light diffusion control portion.

11. The aerial imaging device according to claim 1, characterized in that, The functional layer is the light diffusion control unit. The weather-resistant layer is at least one of the following: a coating containing the ultraviolet absorber, an adhesive layer containing the ultraviolet absorber, an adhesive layer containing the ultraviolet absorber, and a substrate containing the ultraviolet absorber.

12. The aerial imaging device according to claim 1, characterized in that, The functional layer is the light diffusion control unit. The display unit is arranged such that the display surface is not parallel to the surface of the light diffusion control unit that is opposite to the light-transmitting imaging unit.

13. The aerial imaging device according to claim 1, characterized in that, The functional layer is the light diffusion control unit. When the direction perpendicular to the long side of the plate-shaped region and existing in the plane of the light diffusion control section opposite to the light-transmitting imaging section is defined as the first direction, Each of the plate-shaped regions is inclined in the first direction within the light diffusion control unit.

14. The aerial imaging device according to claim 1, characterized in that, The light-transmitting imaging unit has a retrotransmission optical element that enables incident light to be transmitted in reverse.

15. The aerial imaging device according to claim 14, characterized in that, The retrotransmission optical element is a component formed by stacking two layers with multiple reflective surfaces. In each of the two layers, the plurality of reflective surfaces are perpendicular to one side of the retrotransmission optical element and arranged at predetermined intervals from each other. The two layers are stacked in such a manner that the reflective surface of one layer is orthogonal to the reflective surface of the other layer.

16. A laminate comprising a light-transmitting imaging portion and a functional layer, wherein the light-transmitting imaging portion images light incident from one side of the surface onto a position on the other side of the surface, and the functional layer is laminated on one side of the light-transmitting imaging portion. The laminate is characterized in that... The functional layer is any one of the following: an antistatic layer containing an antistatic agent, a coloring layer containing a coloring component, and a light diffusion control unit. When the functional layer is the coloring layer, the laminate of the light-transmitting imaging part and the coloring layer relative to the black plate is determined by CIE1976L. a b The color difference ΔE specified by the color system The transmittance is 20 or less, and the total transmittance of the laminate is 10% or more and 100% or less. When the functional layer is the light diffusion control unit, the light diffusion control unit diffuses or transmits light incident into the light diffusion control unit according to its incident angle, and has a regular internal structure in the shape of louvers. The regular internal structure in the shape of louvers has multiple plate-shaped regions with relatively high refractive index in regions with relatively low refractive index, and the laminate further has a weather-resistant layer containing an ultraviolet absorber, or the light diffusion control unit contains an ultraviolet absorber.

17. The laminate according to claim 16, characterized in that, The functional layer is the antistatic layer. The antistatic layer is at least one of the following: a coating containing the antistatic agent, an adhesive layer containing the antistatic agent, a substrate containing the antistatic agent, and a light diffusion control part containing the antistatic agent. The light diffusion control unit diffuses or transmits light incident upon it according to its incident angle, and has a regular internal structure in the shape of louvers. This regular internal structure in the shape of louvers has multiple plate-like regions with relatively high refractive indices in regions with relatively low refractive indices.

18. The laminate according to claim 16, characterized in that, The functional layer is the coloring layer. The coloring layer is an adhesive layer containing the coloring component.

19. The laminate according to claim 16, characterized in that, The functional layer is the coloring layer. The laminate includes a light diffusion control unit, which is stacked on any side of the light-transmitting imaging unit. The light diffusion control unit diffuses or transmits light incident upon it according to its incident angle, and has a regular internal structure in the shape of louvers. This regular internal structure in the shape of louvers has multiple plate-like regions with relatively high refractive indices in regions with relatively low refractive indices.

20. The laminate according to claim 19, characterized in that, The functional layer is the coloring layer. The light diffusion control unit contains coloring components. The laminate includes the light diffusion control unit as the coloring layer.

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