Decorative hologram sheet, decorative display device, mobile body component, external information display system

Abstract

To display information to easily attract attention.SOLUTION: A decorative hologram sheet 10 includes a decorative sheet 20 configured to transmit part of light and a hologram sheet 30 laminated on the decorative sheet 20. The hologram sheet 30 forms an image 35 at a location distanced from the decorative sheet 20.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a decorated hologram sheet, a decorated display device having a decorated hologram sheet, a mobile body member having a decorated hologram sheet, and an external information display system having a mobile body member. [Background technology]

[0002] Display devices that display information are widely used. When not displaying anything, such display devices are usually observed to be black. Meanwhile, for surface components of mobile objects, for example, it is extremely important that the design harmonize with the surrounding environment. Display devices that are currently used in various fields, such as mobile objects, furniture, and housing materials, are not only expected to simply display information, but also to harmonize with the surrounding environment.

[0003] In order to achieve harmony in design between a display device in a non-display state and devices arranged around the display device, it has been considered to provide a decorative sheet facing the display surface of the display device and the devices arranged around the display device. For example, the decorative sheet described in Patent Document 1 displays a design that harmonizes with the surrounding environment by forming a design with a design portion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2020 / 196906 Summary of the Invention [Problem to be solved by the invention]

[0005] A display device displays information on a display surface of the display device. The information displayed on the display surface is observed at approximately the same position as the design displayed by the decorative sheet, and is therefore unlikely to be noticed by an observer. The present disclosure aims to display information in a manner that is easily noticed.

[0006] The decorated hologram sheet of the present disclosure is A decorative sheet that transmits part of the light; a hologram sheet laminated on the decorative sheet, The hologram sheet projects an image at a position away from the decorative sheet.

[0007] In the decorated hologram sheet of the present disclosure, the hologram sheet may have a plurality of images recorded thereon.

[0008] In the decorated hologram sheet of the present disclosure, the hologram sheet may diffract light incident from a direction at an angle of 60° or less with respect to the normal direction of the sheet surface.

[0009] In the decorated hologram sheet of the present disclosure, the hologram sheet may diffract light in a direction at an angle of 60° or less relative to the normal direction of the sheet surface.

[0010] In the decorated hologram sheet of the present disclosure, the decorative sheet may include a picture portion that forms a design, and a transparent portion that is a portion where the picture portion is not formed.

[0011] In the decorated hologram sheet of the present disclosure, the decorative sheet may include a pattern layer that transmits at least a portion of light incident at each position.

[0012] In the decorated hologram sheet of the present disclosure, the decorative sheet may have a visible light transmittance of 10% or more.

[0013] The decorated hologram sheet of the present disclosure further includes a surface layer laminated on the decorative sheet on the side opposite to the side on which the hologram sheet is laminated, The surface layer may have an uneven shape.

[0014] The decorated display device of the present disclosure includes: A light source and any one of the above-described decorated hologram sheets that is irradiated with light from the light source, The hologram sheet forms the image using light from the light source.

[0015] The moving body member of the present disclosure includes: A hologram sheet having any one of the above-described decorative hologram sheets is provided. The decorated hologram sheet is provided so that the side of the decorative sheet on which the hologram sheet is laminated is attached to a part of the moving body.

[0016] The external information display system of the present disclosure comprises: A light source and the moving body member described above that is irradiated with light from the light source; a sensor for detecting information outside the moving body, the light source irradiates the decorated hologram sheet with light based on the information detected by the sensor; The hologram sheet forms the image using light from the light source. [Effects of the Invention]

[0017] According to the present disclosure, information can be displayed in a way that is easy to notice. [Brief explanation of the drawings]

[0018] [Figure 1] Fig. 1 is a diagram for explaining one embodiment, and is a perspective view that schematically shows a mobile object equipped with an external information display system. In particular, Fig. 1 shows an automobile as an example of the mobile object. [Figure 2] FIG. 2 is a diagram showing the interior of the automobile of FIG. 1, illustrating an example of an external information display system. [Figure 3] FIG. 3 is a perspective view showing an example of a decorated hologram sheet. [Figure 4] FIG. 4 is a cross-sectional view showing an example of a decorated hologram sheet. [Figure 5]FIG. 5 is an enlarged front view of the decorative sheet in the decorated hologram sheet of the example of FIG. [Figure 6] FIG. 6 is a cross-sectional view showing another example of a decorated hologram sheet. [Figure 7] FIG. 7 is a diagram showing a state in which the external information display system is not displaying information. [Figure 8] FIG. 8 is a diagram showing a state in which the external information display system displays information. [Figure 9] FIG. 9 is a side view showing an example of an external information display system. DETAILED DESCRIPTION OF THE INVENTION

[0019] An embodiment of the present disclosure will be described below with reference to the drawings. In the drawings accompanying this specification, the scale and aspect ratios have been appropriately changed and exaggerated from those of the actual objects for the sake of ease of illustration and understanding. Configurations shown in some drawings may be omitted in other drawings.

[0020] In this specification, terms that specify shapes, geometric conditions, and their degrees, such as "parallel," "orthogonal," and "identical," as well as values ​​of lengths and angles, are not limited to their strict meanings, but are interpreted to include a range within which similar functions can be expected.

[0021] In this specification, terms such as "sheet," "film," and "plate" are not distinguished from one another solely on the basis of differences in name. For example, a "decorative sheet" cannot be distinguished from a member called a decorative film or a decorative plate solely on the basis of differences in name.

[0022] In this specification, the normal direction of a sheet-like (film-like, plate-like) member refers to the normal direction to the sheet surface of the target sheet-like (film-like, plate-like) member. The "sheet surface (film surface, plate surface)" refers to the surface that coincides with the planar direction of the target sheet-like (film-like, plate-like) member when the target sheet-like (film-like, plate-like) member is viewed overall and globally.

[0023] FIG. 1 schematically shows a moving body equipped with an external information display system 3. In particular, FIG. 1 shows an automobile 1 as an example of a moving body. As shown in FIG. 1, the automobile 1 has a side mirror. A sensor 5 of the external information display system 3 is provided on the side of the side mirror opposite to the side that is observed from inside the automobile 1. The sensor 5 is not limited to the example shown in the figure, and may be provided at any position on the automobile 1. For example, the sensor 5 may be provided inside the automobile 1.

[0024] The external information display system 3 displays information outside the automobile 1. In particular, the external information display system 3 displays information inside the automobile 1 that cannot be observed from inside the automobile 1. FIG. 2 shows an example of the interior of the automobile 1. The external information display system 3 has a sensor 5, a control unit 6, a light source 8, and a mobile body member 9.

[0025] The sensor 5 detects information outside the automobile 1. The sensor 5 detects, for example, visible light. The sensor 5 may also detect light other than visible light, such as infrared light, or something other than light. The information detected by the sensor 5 is sent to the control unit 6.

[0026] The control unit 6 is electrically connected to the sensor 5 and the light source 8. The control unit 6 controls the light source 8 based on information detected by the sensor 5. The control unit 6 may include a processor such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit). The control unit 6 may further include a memory such as a ROM (Read Only Memory) or a RAM (Random Access Memory). The control unit 6 may control the light source 8 based on information detected by the sensor 5 by executing a program recorded in the memory. As shown in FIG. 1 , the control unit 6 is built into, for example, an automobile 1.

[0027] The light source 8 is provided, for example, inside the automobile 1. The light source 8 irradiates light onto the movable body member 9. In particular, the light source 8 is connected to the control unit 6 and irradiates light onto the movable body member 9 based on information detected by the sensor 5 via the control unit 6. The light irradiated by the light source 8 includes a wavelength at which a hologram sheet 30 (described later) of the movable body member 9 forms an image. The light source 8 may be capable of irradiating light of different wavelengths onto the hologram sheet 30 of the movable body member 9. The light source 8 is provided at a position where it can irradiate light at an angle at which the hologram sheet 30 of the movable body member 9 forms an image. The light source 8 may be capable of irradiating light onto the hologram sheet 30 of the movable body member 9 at different angles. The light source 8 may be capable of irradiating light onto different positions on the hologram sheet 30 of the movable body member 9.

[0028] The mobile body member 9 is provided inside the automobile 1, for example, on the center console, door console, dashboard, pillar, etc. The mobile body member 9 is provided inside the automobile 1, for example, by an adhesive layer (not shown). The mobile body member 9 is, for example, a film-like member. The mobile body member 9 has a decorated hologram sheet 10. The decorated hologram sheet 10 has a decorative sheet 20 and a hologram sheet 30. In the mobile body member 9, the decorated hologram sheet 10 is provided so that the side of the decorative sheet 20 on which the hologram sheet 30 is laminated faces a part of the automobile 1. In other words, in the mobile body member 9 observed from inside the automobile 1, the hologram sheet 30 is covered by the decorative sheet 20.

[0029] FIG. 3 is a perspective view of a decorated hologram sheet 10. As shown in FIG. 3, the decorated hologram sheet 10 has a surface layer 15, a decorative sheet 20, a hologram sheet 30, and a bonding layer 17. The surface layer 15 may be omitted. The decorated hologram sheet 10 displays the design of the decorative sheet 20. When the decorated hologram sheet 10 is irradiated with light from a light source 8, the hologram sheet 30 displays an image 35 corresponding to the irradiated light. In the example shown in FIG. 3, the decorated hologram sheet 10 displays an image 35 of the letters "ABCD." The image 35 may be not only letters, but also figures, patterns, etc. The image 35 is observed to stand out toward the viewer relative to the design displayed by the decorative sheet 20. Alternatively, the image 35 is observed to be recessed on the opposite side of the viewer from the design displayed by the decorative sheet 20.

[0030] In the illustrated example, the decorated hologram sheet 10 is shown as a flat plate. The decorated hologram sheet 10 may be curved by curving or bending. For example, at least one of the surface layer 15, the decorative sheet 20, and the hologram sheet 30 of the decorated hologram sheet 10 may be curved.

[0031] 4 and 6 show cross-sectional views of an example and another example of the decorated hologram sheet 10. In the examples shown in Fig. 4 and Fig. 6, the configuration of the decorative sheet 20 is different, but the other configurations are the same. Each component of the decorated hologram sheet 10 will be described below.

[0032] The surface layer 15 forms the surface of the movable body member 9 and the decorated hologram sheet 10. The surface layer 15 is laminated on the side of the decorative sheet 20 opposite to the side on which the hologram sheet 30 is laminated. The surface layer 15 has an uneven shape 16. The uneven shape 16 causes the surface layer 15 to change the diffusion of light that passes through it. The surface layer 15 changes the design displayed by the decorated hologram sheet 10 to, for example, a matte finish.

[0033] The uneven shape 16 may be arranged regularly or irregularly. The surface roughness Ra of the uneven shape 16 is, for example, 0.5 μm or more and 10 μm or less. The surface roughness Ra of the uneven shape 16 refers to the arithmetic mean roughness defined in JIS B 0601:1982. The surface roughness can be measured using a stylus-type surface roughness measuring instrument (for example, the Surfcorder "ET4000L" manufactured by Kosaka Laboratory). The measurement conditions are a cutoff wavelength of 0.8 mm, a cutoff type of phase compensation, a measurement speed of 0.1 mm / sec, a reference length of 0.8 mm, and an evaluation length (measurement length) of 4 mm. Such uneven shape 16 allows the image displayed by the decorated hologram sheet 10 to be displayed appropriately while changing the design displayed by the decorated hologram sheet 10.

[0034] The surface layer 15 is transparent. The surface layer 15 is a film-like member. The thickness of the surface layer 15 is, for example, 10 μm or more and 100 μm or less. Examples of materials that can be used for the surface layer 15 include polyethylene terephthalate, polyethylene naphthalate, polycarbonate, acrylic, triacetyl cellulose (TAC), polystyrene, and cyclic polyolefin. The surface layer 15 may be provided with some function. Examples of functions that can be provided to the surface layer 15 include an antibacterial function, an antiviral function, an alcohol-resistant function, a low-reflection (LR) function, a hard coat (HC) function with scratch resistance, and an antifouling function. The surface layer 15 may be provided with two or more functions.

[0035] In this specification, "transparent" means that the visible light transmittance is 50% or more, preferably 80% or more. The visible light transmittance is specified as the average value of the total light transmittance at each wavelength when measured in 1-nm increments within the measurement wavelength range of 380 nm to 780 nm using a spectrophotometer (Shimadzu Corporation's "UV-3100PC", JIS K 0115 compliant).

[0036] The decorative sheet 20 displays a design. The decorative sheet 20 is located between the surface layer 15 and the hologram sheet 30. The decorative sheet 20 transmits a portion of the incident light. The visible light transmittance of the decorative sheet 20 is preferably 50% or less, and more preferably 40% or less. If the visible light transmittance of the decorative sheet 20 is not too high, the decorative sheet 20 can display a rich design, and particularly a dark design. The visible light transmittance of the decorative sheet 20 is preferably 10% or more, and more preferably 20% or more. If the visible light transmittance of the decorative sheet 20 is not too low, light from the light source 8 can pass through the decorative sheet 20 and enter the hologram sheet 30. Light diffracted by the hologram sheet 30 passes through the decorative sheet 20, allowing the hologram sheet 30 to form a clear image 35. The range of the visible light transmittance of the decorative sheet 20 can be set by arbitrarily combining any of the upper limit values ​​of the visible light transmittance and any of the lower limit values ​​of the visible light transmittance described above.

[0037] 4, the decorative sheet 20 has a base material 21, a pattern portion 22, a dark color portion 23, and a transmissive portion 24. The decorative sheet 20 is arranged so that the side of the pattern portion 22 on which the dark color portion 23 is provided is the side on which the hologram sheet 30 is provided. The decorative sheet 20 may also be arranged so that the side of the dark color portion 23 on which the pattern portion 22 is provided is the side on which the hologram sheet 30 is provided.

[0038] The substrate 21 is a support that properly supports the picture portion 22 and the dark color portion 23. The substrate 21 allows the decorative sheet 20 to have an appropriate thickness. The substrate 21 is a transparent film-like member. In consideration of transparency and proper support for the picture portion 22 and the dark color portion 23, the substrate 21 preferably has a thickness of 10 μm or more and 500 μm or less. The substrate 21 is made of, for example, polyethylene terephthalate, polycarbonate, acrylic, triacetyl cellulose (TAC), etc.

[0039] The picture portion 22 forms the design displayed by the decorative sheet 20. More specifically, the picture portion 22 reflects a portion of light incident from the outside, thereby forming a design that can be observed from the outside. The picture portion 22 can form a design such as a figure, pattern, design, color, picture, photograph, character, mark, pictogram, letter, or number. The picture portion 22 may also express a design that displays a background. For example, the picture portion 22 may form a wood grain pattern, a leather (grained) pattern, a stone grain pattern of a stone surface such as marble, granite, or sandstone, a sand grain pattern, a tiled pattern, a brickwork pattern, a fabric pattern, a geometric pattern, or the like, as a design that can harmonize the decorated hologram sheet 10 with the surrounding environment in which the decorated hologram sheet 10 is installed, such as the interior of a vehicle. The picture portion 22 may be formed by printing. The picture portion 22 may also be formed by transfer printing.

[0040] The thickness of the pattern portion 22 is preferably 1 μm or more and 20 μm or less. When the pattern portion 22 is sufficiently thick, the pattern formed by the pattern portion 22 can be thick and clear.

[0041] The dark color portions 23 have the function of absorbing light so that light from the hologram sheet 30 does not enter the pattern portion 22. The dark color portions 23 may contain, for example, light-absorbing particles in a binder resin. Examples of light-absorbing particles include black pigments such as carbon black and titanium black. The dark color portions 23 are preferably provided only in positions that overlap the pattern portion 22. In this case, the dark color portions 23 are less likely to inhibit light entering the hologram sheet 30 and light diffracted by the hologram sheet 30 from passing through the transparent portions 24. If the dark color portions 23 are sufficiently thick to cover the pattern portion 22, the pattern formed by the pattern portion 22 can be made dark and clear. As a specific example, the thickness of the dark color portions 23 is 1 μm or more and 20 μm or less.

[0042] 4, the cross-sectional shapes of the pattern portion 22 and the dark color portion 23 are rectangular, but are not limited to this and may be trapezoidal, for example. The cross-sectional shape of the transparent portion 24, which is a non-forming portion of the pattern portion 22 and the dark color portion 23, may also change according to the cross-sectional shapes of the pattern portion 22 and the dark color portion 23.

[0043] The transparent portions 24 are portions where the pattern portions 22 and the dark portions 23 are not formed. The transparent portions 24 are provided to transmit light incident on the decorative sheet 20 and light diffracted by the hologram sheet 30. In order to transmit light sufficiently, the proportion of the area occupied by the transparent portions 24 in the decorative sheet 20 in a plan view (also called the aperture ratio) is preferably 10% or more. On the other hand, in order to make the design displayed by the decorative sheet 20 easier to observe, the proportion of the area occupied by the transparent portions 24 in the decorative sheet 20 is preferably 60% or less.

[0044] FIG. 5 shows an enlarged portion of a front view of the decorative sheet 20. In the example shown in FIG. 5, multiple transmissive portions 24 are spaced apart from one another. A pattern portion 22 is formed between each of the transmissive portions 24. In the illustrated example, each transmissive portion 24 is circular in front view, and the multiple transmissive portions 24 are arranged in a square lattice pattern. When the transmissive portions 24 are arranged in a lattice pattern, particularly a square lattice pattern, light from the hologram sheet 30 can be uniformly transmitted, reducing the likelihood of unevenness in the image 35 formed by the hologram sheet 30. The transmissive portions 24 are not limited to the illustrated example and may have any shape or be arranged in any position. To ensure isotropy of the optical properties, the transmissive portions 24 preferably have a circular shape in a plan view and are preferably arranged regularly. The diameter of each transmissive portion 24 is, for example, 30 μm or more and 150 μm or less.

[0045] 4, the transmission portion 24 is filled with the material that forms the surface layer 15. However, the transmission portion 24 may be a void such as a hole. When the transmission portion 24 is a void, the transmission portion 24 may be filled with a transparent gas such as air, or may be a vacuum.

[0046] The transparent portion 24 can be formed, for example, by irradiating a laser onto the pattern portion 22 and dark portion 23 provided on the entire surface of the substrate 21 at the position where the transparent portion 24 is to be formed, and removing the pattern portion 22 and dark portion 23 at the position irradiated with the laser.

[0047] 6, the decorative sheet 20 has a base material 21, a pattern layer 26, and a dark color layer 27. The decorative sheet 20 is arranged so that the side of the pattern layer 26 on which the dark color layer 27 is provided is the side on which the hologram sheet 30 is provided. The decorative sheet 20 may also be arranged so that the side of the dark color layer 27 on which the pattern layer 26 is provided is the side on which the hologram sheet 30 is provided. The base material 21 is the same as the decorative sheet 20 in the example shown in FIG.

[0048] The picture layer 26 forms the design displayed by the decorative sheet 20, similar to the picture portion 22 in the example of Figure 4. The picture layer 26 can transmit at least a portion of the light incident at each position. This allows the picture layer 26 to transmit light incident on the decorative sheet 20 and light diffracted by the hologram sheet 30 at each position. The picture layer 26 may have a portion that transmits all of the incident light. In other words, a portion of the picture layer 26 may be transparent. The thickness of the picture layer 26 is preferably 1 μm or more and 20 μm or less. By making the picture layer 26 sufficiently thick, the picture formed by the picture layer 26 can be made dark and clear.

[0049] The dark layer 27 makes the hologram sheet 30 difficult to observe from the outside. The dark layer 27 also covers the picture layer 26 from the side of the hologram sheet 30, making the design formed by the picture layer 26 appear dark and clear. When the dark layer 27 is thick enough to cover the picture layer 26, the picture formed by the picture layer 26 can appear dark and clear. As a specific example, the thickness of the dark layer 27 is 1 μm or more and 20 μm or less. The dark layer 27 absorbs part of the incident light at each position while transmitting the other part. The dark layer 27 typically contains a black pigment to make it black.

[0050] The hologram sheet 30 has an image 35 recorded thereon. When irradiated with light, the hologram sheet 30 projects the recorded image 35 at a predetermined position 37. The position 37 where the hologram sheet 30 projects the image 35 is a position away from the decorative sheet 20. The distance D between the position 37 where the image 35 is to be projected and the decorative sheet 20 is preferably 10 mm or more and 2000 mm or less. The hologram sheet 30 may project the image 35 on the side where light from the light source 8 is incident, or may project the image 35 on the side opposite to the side where light from the light source 8 is incident.

[0051] Hologram sheet 30 may have multiple images 35 recorded on it. Hologram sheet 30 can independently form the multiple recorded images 35 based on the incident light. Hologram sheet 30 can form different images 35 depending on, for example, the wavelength of light from light source 8, the position at which light from light source 8 enters hologram sheet 30, and the angle of incidence. Light source 8 may be capable of irradiating hologram sheet 30 with light of different wavelengths, or may be capable of irradiating hologram sheet 30 with light at different positions, or may be capable of irradiating hologram sheet 30 with light at different angles.

[0052] In the example shown in FIGS. 4 and 6, the hologram sheet 30 has a base layer 31 and a hologram layer 33.

[0053] The substrate layer 31 supports the hologram layer 33. The substrate layer 31 is transparent. Examples of materials for the substrate layer 31 include polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polystyrene, and cyclic polyolefin. The thickness of the substrate layer 31 is, for example, 10 μm or more and 100 μm or less.

[0054] Information about interference fringes for forming an image 35 is recorded as a hologram in the hologram layer 33. When irradiated with reconstruction illumination light of a specific wavelength from a specific direction, the hologram layer 33 diffracts the reconstruction illumination light in a predetermined direction. The reconstruction illumination light diffracted by the hologram layer 33 forms a predetermined image 35 at a predetermined position as reconstruction light.

[0055] Information about the interference fringes can be recorded in the hologram layer 33 in various forms. The hologram layer 33 may be a phase hologram or an amplitude hologram. The hologram layer 33 may be a reflection hologram or a transmission hologram. The hologram layer 33 may be a relief hologram or a relief hologram as a computer-generated hologram (CGH). The hologram layer 33 may be a volume hologram in that it is capable of forming a large image 35. Examples of materials for the hologram layer 33 as a volume hologram include silver halide photosensitive materials, dichromated gelatin, crosslinkable polymers, and hardened materials such as photopolymers. The thickness of the hologram layer 33 may be 1 μm or more and 100 μm or less, or 5 μm or more and 40 μm or less.

[0056] The hologram layer 33 serving as a volume hologram can be easily replicated using a hologram master. The hologram master can be fabricated by exposing a photosensitive material to object light, which is light reflected from an actual object, and reference light, which is coherent with the object light. The relationship between the photosensitive material and the reference light during this exposure may be determined based on the relationship between the hologram layer 33 and the light source 8. Similarly, the relative position between the hologram master and the actual object may be determined based on the relationship between the hologram layer 33 and the position 37 where the image 35 is to be formed. Furthermore, the wavelength of the light used for exposure may be determined based on the wavelength of the light emitted by the light source 8. The hologram layer 33 serving as a volume hologram fabricated in this manner can diffract light of a specific wavelength incident from a specific direction and form the image 35 at a predetermined relative position relative to the hologram layer 33.

[0057] Hologram sheet 30, which has hologram layer 33, diffracts light incident from a specific direction. This direction preferably forms a small angle with respect to the normal direction to the sheet surface of hologram sheet 30. Specifically, the angle θ1 with respect to the normal direction to the sheet surface of hologram sheet 30 is preferably 60° or less, and more preferably 30° or less. In other words, the angle θ1 that light L1 incident on hologram sheet 30 (shown in FIGS. 4 and 6) makes with respect to the normal direction nd to the sheet surface of hologram sheet 30 is preferably 60° or less, and more preferably 30° or less. Light source 8 irradiates light onto hologram sheet 30 so as to satisfy this angle condition.

[0058] Hologram sheet 30, which has hologram layer 33, diffracts light to form an image 35 at a predetermined position 37. This position 37 is preferably in a direction that forms a small angle with respect to the normal to the sheet surface of hologram sheet 30. Specifically, it is preferably in a direction that is 60° or less, and more preferably 30° or less, with respect to the normal to the sheet surface of hologram sheet 30. In other words, the angle θ2 that light L2 diffracted by hologram sheet 30 (shown in FIGS. 4 and 6) makes with the normal nd to the sheet surface of hologram sheet 30 is preferably 60° or less, and more preferably 30° or less.

[0059] The bonding layer 17 bonds the decorative sheet 20 and the hologram sheet 30. The bonding layer 17 can be made of a variety of layers made of materials with adhesive or tackiness. The bonding layer 17 is transparent. A typical example of the material for the bonding layer 17 is a layer made of an acrylic adhesive. The thickness of the bonding layer 17 is, for example, 0.15 mm or more and 1 mm or less.

[0060] If distortion occurs between the decorative sheet 20 and the hologram sheet 30, it may happen that light transmitted through the decorative sheet 20 does not properly enter the hologram sheet 30, or that light diffracted by the hologram sheet 30 does not properly transmit through the decorative sheet 20. As a result, the hologram sheet 30 may not properly form an image 35. In order to suppress distortion between the decorative sheet 20 and the hologram sheet 30, it is preferable that the bonding layer 17 is resistant to deformation. Specifically, the elastic modulus of the bonding layer 17 is 1.0×10 5 It is preferable that the viscosity is 1 Pa or more.

[0061] 7 shows the decorated hologram sheet 10 in a state where the external information display system 3 is not displaying any information. At this time, the light source 8 is not irradiating the decorated hologram sheet 10 with light. The decorated hologram sheet 10 displays the design of the decorative sheet 20. This allows the mobile body member 9 to have an appearance that is integrated with its surroundings.

[0062] 8 shows the decorated hologram sheet 10 when information is displayed by the external information display system 3. The decorated hologram sheet 10 displays the design of the decorative sheet 20, and also displays an image 35 formed by the hologram sheet 30 at a position away from the decorative sheet 20, superimposed on the design.

[0063] The operation of the external information display system 3 to display information will now be described. FIG. 9 shows a schematic side view of the external information display system 3 displaying information. The sensor 5 detects information, for example, from the outside of the automobile 1. The information detected by the sensor 5 is sent to the control unit 6. The control unit 6 controls the light source 8 based on the information detected by the sensor 5. For example, based on information received from the sensor 5 that an obstacle is present in the vicinity, the control unit 6 controls the light source 8 so that the decorated hologram sheet 10 displays information calling attention to the obstacle as an image 35. Alternatively, based on information received from the sensor 5 that a passerby is approaching, the control unit 6 controls the light source 8 so that the decorated hologram sheet 10 displays information calling attention to the passerby as an image 35. The decorated hologram sheet 10 may display both information calling attention to the obstacle and information calling attention to the passerby as separate images 35. The light source 8 irradiates the decorated hologram sheet 10 with light under the control of the control unit 6. Light emitted by the light source 8 is irradiated onto the decorated hologram sheet 10 so that the hologram sheet 30 forms a desired image 35. In the illustrated example, the hologram sheet 30 includes a reflective hologram. The light source 8 is disposed on the decorative sheet 20 side relative to the hologram sheet 30.

[0064] Light emitted from the light source 8 passes through the surface layer 15 of the decorated hologram sheet 10 and the decorative sheet 20. If the decorative sheet 20 has a transmissive portion 24 as in the example shown in FIG. 4, the light passes through the transmissive portion 24. If the decorative sheet 20 has a picture layer 26 and a dark layer 27 as in the example shown in FIG. 6, the light passes through the picture layer 26 and the dark layer 27. The light then enters the hologram layer 33 of the hologram sheet 30. The light that enters the hologram layer 33 is diffracted based on the interference fringe information recorded in the hologram layer 33. The light diffracted by the hologram layer 33 is focused at a predetermined position 37 and forms an image 35 based on the interference fringe information. In other words, the light emitted from the light source 8 becomes reproduction light that reproduces the hologram recorded in the hologram sheet 30.

[0065] Conventional display devices display information on a display surface of the display device. For example, information is displayed by light from the rear passing through a transparent portion of a predetermined shape. When a decorative sheet is provided on a display device, the design displayed by the decorative sheet and the information displayed on the display surface are observed in approximately the same position. This makes it difficult for an observer to notice the information. In particular, it is desirable for information intended to draw attention to be displayed in a way that is easy to notice.

[0066] In the decorated hologram sheet 10 of this embodiment, the hologram sheet 30 connects the recorded image 35 to a position 37 that is distant from the decorative sheet. In other words, the design displayed by the decorative sheet 20 and the information displayed as the image 35 are observed at different positions. For example, the image 35 is observed to stand out from the decorative sheet 20 toward the viewer. Alternatively, the image 35 is observed to be recessed from the decorative sheet 20 on the opposite side from the viewer. Such an image 35 is likely to attract attention. By displaying information using the image 35, the information can be displayed in a manner that attracts attention.

[0067] Hologram sheet 30 records multiple images 35. Hologram sheet 30 independently forms the multiple recorded images 35 based on the incident light. By controlling the light that light source 8 irradiates hologram sheet 30, hologram sheet 30 can select and form a desired image 35 from the multiple images 35 recorded on hologram sheet 30. This allows decorated hologram sheet 10 to independently display multiple pieces of information.

[0068] The hologram sheet 30 diffracts light incident from a direction of 60° or less relative to the normal to the sheet surface. By making a small angle between the incident light and the normal to the sheet surface of the hologram sheet 30, the hologram sheet 30 can diffract more light. In particular, when the decorative sheet 20 has transmissive portions 24 as in the example shown in FIG. 4, the light diffracted by the hologram sheet 30 is more likely to pass through the transmissive portions 24. The more light that is incident on and diffracted by the hologram sheet 30, the clearer the image 35 becomes.

[0069] The hologram sheet 30 diffracts light in a direction of 60° or less relative to the normal to the sheet surface. The light diffracted by the hologram sheet 30 forms a small angle with the normal to the sheet surface of the hologram sheet 30, so that more light can be diffracted by the hologram sheet 30. In particular, when the decorative sheet 20 has transmissive portions 24 as in the example shown in FIG. 4, the light diffracted by the hologram sheet 30 is more likely to pass through the transmissive portions 24. More light is diffracted by the hologram sheet 30 to form an image 35, making the image 35 clearer.

[0070] The visible light transmittance of the decorative sheet 20 is 10% or more. If the visible light transmittance of the decorative sheet 20 is not too low, light can pass through the decorative sheet 20 and enter the hologram sheet 30, and light diffracted by the hologram sheet 30 can pass through the decorative sheet 20 to form a clear image 35. In particular, when at least a portion of the incident light is transmitted at each position on the pattern layer 26 of the decorative sheet 20, as in the example shown in FIG. 6 , by making the visible light transmittance of the decorative sheet 20 sufficiently high, the light diffracted by the hologram sheet 30 and the light diffracted by the hologram sheet 30 can be sufficiently transmitted through the decorative sheet 20. More light is diffracted by the hologram sheet 30 to form the image 35, making the image 35 clearer.

[0071] Surface layer 15 has an uneven shape 16. Surface layer 15 having uneven shape 16 can change the design displayed by decorated hologram sheet 10. The design displayed by decorated hologram sheet 10 can be made to blend in with the surrounding environment.

[0072] As described above, the decorated hologram sheet 10 of this embodiment comprises the decorative sheet 20, which transmits a portion of light, and the hologram sheet 30 laminated on the decorative sheet 20, and the hologram sheet 30 projects the recorded image 35 at a position 37 away from the decorative sheet 20. With this decorated hologram sheet 10, the design displayed by the decorative sheet 20 and the information displayed by the image 35 are observed at different positions. This image 35 is easily noticed. By displaying information using the image 35, the information can be displayed in a way that is easily noticed.

[0073] Various modifications can be made to the above-described embodiment.

[0074] The decorated hologram sheet 10 may be applied to other than the mobile body member 9. For example, the decorated hologram sheet 10 may be applied to surface members of furniture, housing construction materials, and the like.

[0075] As shown in FIGS. 2 and 9, a decorated display device 7 may be configured with a light source 8 and a decorated hologram sheet 10. In other words, the decorated display device 7 has a light source 8 and a decorated hologram sheet 10. The decorated hologram sheet 10 is irradiated with light from the light source 8. The hologram sheet 30 forms an image 35 by the light from the light source 8. The decorated display device 7 can decorate the surfaces of mobile objects, furniture, housing materials, etc., and display the image 35.

[0076] In the above-described embodiment, the hologram sheet 30 forms a recorded image 35 based on light from the light source 8. The hologram sheet 30 may not record an image to be displayed, but may instead form an image from the light from the light source 8. In this case, the hologram sheet 30 functions as a lens that diffracts light to direct the incident light to a desired position and form an image. The information displayed by the decorated hologram sheet 10 is formed by light from the light source 8. The light source 8 is an image display device, and the image light from the light source 8 is formed by the hologram sheet 30 as an image 35 that displays the information. The light source 8 as an image display device can be any display device, such as a liquid crystal display, a plasma display, or an organic EL display.

[0077] In the above-described embodiment, the hologram layer 33 of the hologram sheet 30 is a reflective hologram. The hologram layer 33 may be a transmissive hologram. When the hologram layer 33 is a transmissive hologram, the light source 8 is disposed on the opposite side of the hologram sheet 30 from the decorative sheet 20. [Explanation of symbols]

[0078] 1. Automobiles 3. External Information Display System 5 sensors 6 Control Unit 7 Decorative display devices 8 light source 9. Mobile body components 10 Decorative hologram sheet 15 Surface layer 16 Uneven shape 17 Bonding layer 20 Decorative sheet 21 Base material 22 Picture section 23 Dark area 24 Transparent part 26 Picture layer 27 Dark layer 30 Hologram Sheet 31 Base material layer 33 Hologram Layer 35 statues 37 position

Claims

1. A decorative sheet that transmits part of the light; a hologram sheet laminated on the decorative sheet, the hologram sheet projects an image at a position separated from the decorative sheet; the hologram sheet records a plurality of images; The hologram sheet forms different images depending on the incident position or incident angle of light, The decorative sheet is a decorated hologram sheet including a picture portion that forms a design and a transparent portion that is a non-formation portion of the picture portion.

2. A decorative sheet that transmits part of the light; a hologram sheet laminated on the decorative sheet, the hologram sheet projects an image at a position separated from the decorative sheet; the hologram sheet records a plurality of images; The hologram sheet forms different images depending on the incident position or incident angle of light, The decorative sheet is a decorated hologram sheet including a pattern layer that transmits at least a part of the light incident at each position.

3. 3. The decorated hologram sheet according to claim 1, wherein the hologram sheet diffracts light incident from a direction at an angle of 60 degrees or less with respect to the normal direction of the sheet surface.

4. 4. The decorated hologram sheet according to claim 1, wherein the hologram sheet diffracts light in a direction at an angle of 60 degrees or less relative to a normal direction of the sheet surface.

5. 5. The decorated hologram sheet according to claim 1, wherein the decorative sheet has a visible light transmittance of 10% or more.

6. a surface layer laminated on the decorative sheet on the side opposite to the side on which the hologram sheet is laminated, The decorated hologram sheet according to claim 1 , wherein the surface layer has an uneven shape.

7. A light source and and a decorated hologram sheet according to any one of claims 1 to 6, which is irradiated with light from the light source, The hologram sheet forms the image using light from the light source, and is a decorated display device.

8. A decorated hologram sheet according to any one of claims 1 to 6, The decorated hologram sheet is provided as a member for a moving body such that the side of the decorative sheet on which the hologram sheet is laminated faces a part of the moving body.

9. A light source and The moving body member according to claim 8 , which is irradiated with light from the light source; a sensor for detecting information outside the moving body, the light source irradiates the decorated hologram sheet with light based on the information detected by the sensor; The hologram sheet forms the image using light from the light source, thereby forming an external information display system.

Images