Aerial input device, aerial input display device, and hologram sheet

Abstract

To provide an aerial input device that enables a user to recognize a position that can be detected by a non-contact position detection sensor in an existing display device.SOLUTION: An aerial input device 20 includes a light source 31, a hologram sheet 40, and a position detection sensor 21. The hologram sheet 40 forms an image, which is recorded by light from the light source 31, at an image formation position 38. The position detection sensor 21 has sensitivity at a position corresponding to the image formation position 38. A position 21s where the position detection sensor 21 has sensitivity is apart from the hologram sheet 40. The light source 31 exists on the same side as the image formation position 38 with respect to the hologram sheet 40. A distance D1 between the image formation position 38 and the hologram sheet 40 is 10 mm or more.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an aerial input device and an aerial input display device having the aerial input device.The present invention also relates to a hologram sheet. [Background technology]

[0002] There is known an input device that inputs information based on information displayed on a display surface of a display device. For example, a contact-type position detection sensor, a so-called touch panel sensor, provided on the display surface is used as such an input device. The touch panel sensor detects the position of contact, and inputs information based on the detected position. In this way, a user can input information by touching the display surface based on the information displayed on the display surface.

[0003] Currently, there is a demand for non-contact position detection sensors to prevent contact infection of viruses and the like. Infrared sensors and the like are known as sensors that can detect a position without touching a display surface or the like. With a non-contact position detection sensor, the position of an object, such as a finger, can be detected by placing the object at a detectable position. By placing such a non-contact position detection sensor at a position away from the display surface of a display device so as to be able to detect the object, information based on the detected position can be input. Therefore, a user can input information displayed on the display surface without touching the display surface.

[0004] It has been considered to install such a non-contact type position detection sensor in an existing display device. By utilizing an existing display device, an input device that allows contactless input of information based on information displayed on the display surface can be realized at low cost. However, users of such devices may not be able to properly recognize the positions where the contactless type position detection sensor is sensitive because they are invisible. This can result in inability to properly input information or the user unintentionally touching the display surface.

[0005] In addition to such a non-contact type position detection sensor, it has also been considered to provide an aerial imaging device that forms an image in the air, as described in Patent Document 1, for example. In the combination of the aerial imaging device and the non-contact type position detection sensor, the position of the image formed by the aerial imaging device corresponds to the position to which the non-contact type position detection sensor is sensitive. By observing the image formed by the aerial imaging device, the user can recognize the position to which the non-contact type position detection sensor is sensitive. This makes it possible to input information appropriately without touching the display surface. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. 2009 / 131128 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the aerial imaging device described in Patent Document 1 has optical layout constraints due to the positional relationship between the light source and optical elements used for imaging, the user's observation position, and other factors. For this reason, it is difficult to install such an aerial imaging device in an existing display device. In other words, it is difficult to realize, at low cost, a device that allows users to appropriately input information without touching the display surface using an existing display device. The present invention has been made in consideration of these issues, and aims to easily install an aerial imaging device in an existing display device that allows users to recognize positions that can be detected by a non-contact position detection sensor. [Means for solving the problem]

[0008] The aerial input device of the present invention comprises: A light source and a hologram sheet that forms an image recorded by the light from the light source at an imaging position; a position detection sensor having sensitivity at a position corresponding to the imaging position, a position where the position detection sensor is sensitive is spaced apart from the hologram sheet; the light source is located on the same side as the imaging position with respect to the hologram sheet, The distance between the imaging position and the hologram sheet is 10 mm or more.

[0009] According to such an aerial input device, an aerial imaging device that allows a user to recognize positions that can be detected by a non-contact position detection sensor can be easily provided on an existing display device.

[0010] In the air input device of the present invention, the light source may be a point light source.

[0011] With such an air input device, the image formed by the hologram sheet can be made clear, and the air input device can be made smaller.

[0012] In the air input device of the present invention, the light source may emit parallel light.

[0013] With such an aerial input device, the image formed by the hologram sheet can be made clearer.

[0014] In the air input device of the present invention, the hologram sheet may include a volume hologram.

[0015] According to such an air input device, light incident on the hologram sheet can be efficiently focused at the focusing position.

[0016] In the air input device of the present invention, the hologram sheet may have a visible light transmittance of 50% or more.

[0017] With such an aerial input device, visibility through the hologram sheet is less likely to be impaired.

[0018] In the air input device of the present invention, the image may indicate a plurality of detection positions that can be distinguishably recognized by the position detection sensor at the imaging position.

[0019] With such an aerial input device, the user can recognize a plurality of detection positions that can be distinguished and recognized by the position detection sensor by observing the image formed at the image formation position.

[0020] The air input device of the present invention may further comprise a notification means for making a notification corresponding to the detected position.

[0021] Such an air input device allows the user to confirm whether the information he or she has input is the information he or she intended.

[0022] In the air input device of the present invention, the light source includes at least a first light source and a second light source located at a position different from the first light source, The hologram sheet may form a first image recorded by light from the first light source, and form a second image recorded by light from the second light source.

[0023] In the air input device of the present invention, the position detection sensor may include a motion sensor.

[0024] In the aerial input device of the present invention, the hologram sheet may include a hologram layer, and a surface layer that is laminated on the hologram layer to form a surface of the hologram sheet and protects the hologram layer from the outside.

[0025] In the aerial input device of the present invention, the light source emits light having a pattern; The image at the imaging position may include a dot.

[0026] In the air input device of the present invention, the light source may emit light while moving the pattern.

[0027] In the aerial input device of the present invention, the size X1 [mm] of the light source, the distance X2 [mm] between the light source and the hologram sheet, and the diameter X3 [mm] of the dots included in the image recorded on the hologram sheet may satisfy the following relationship: X1 / (X2×X3)≧1 / 75

[0028] In the air input device of the present invention, the light source may have an optical member that controls the direction in which light is emitted.

[0029] The aerial input display device of the present invention comprises: a display device having a display surface for displaying an image; and any one of the above-mentioned air input devices, in which the hologram sheet is provided on the display surface.

[0030] The aerial input display device of the present invention comprises: a display device having a display surface for displaying an image; any one of the aerial input devices described above, in which the hologram sheet is provided on the display surface; the image at the imaging position is made up of any one of a dot, a grid, and a design pattern, or a combination thereof; The sum of the areas of the images observed in a direction perpendicular to the display surface may be 0.1% or more and 60% or less of the area of ​​the display surface.

[0031] With this aerial input device, the user can easily recognize the image position, and can observe the display surface through the image. Furthermore, the image can be observed as if it were located at a distance from the hologram sheet.

[0032] The hologram sheet of the present invention forms a recorded image at a position corresponding to the position to which the position detection sensor is sensitive. [Effects of the Invention]

[0033] According to the present invention, an aerial imaging device that allows a user to recognize a position that can be detected by a non-contact position detection sensor can be easily provided on an existing display device. [Brief explanation of the drawings]

[0034] [Figure 1] FIG. 1 is an exploded perspective view schematically showing the configuration of the aerial input display device according to the first embodiment. [Figure 2] FIG. 2 is a top view illustrating an example of an image displayed on the display device according to the first embodiment. [Figure 3] FIG. 3 is a top view showing an example of an image formed by the aerial imaging device according to the first embodiment. [Figure 4] FIG. 4 is a top view showing another example of an image formed by the aerial imaging device according to the first embodiment. [Figure 5] FIG. 5 is a top view showing still another example of an image formed by the aerial imaging device according to the first embodiment. [Figure 6] FIG. 6 is a top view showing still another example of an image formed by the aerial imaging device according to the first embodiment. [Figure 7] FIG. 7 is a cross-sectional view showing an example of the configuration of a hologram sheet. [Figure 8] FIG. 8 is a top view of the aerial input display device according to the first embodiment. [Figure 9] FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. [Figure 10] FIG. 10 is a diagram illustrating an example of a method for manufacturing a hologram. [Figure 11] FIG. 11 is a diagram illustrating an example of a method for manufacturing a hologram. [Figure 12] FIG. 12 is a diagram illustrating an example of a method for manufacturing a hologram. [Figure 13] FIG. 13 is an exploded perspective view schematically showing the configuration of the aerial input display device according to the second embodiment. [Figure 14]FIG. 14 is a top view illustrating an example of an image displayed on the display device according to the second embodiment. [Figure 15a] FIG. 15a is a top view showing an example of an image formed by the aerial imaging device of the second embodiment. [Figure 15b] FIG. 15b is a top view showing an example of an image formed by the aerial imaging device of the second embodiment. [Figure 16] FIG. 16 is a top view of the aerial input display device according to the second embodiment. [Figure 17] FIG. 17 is a cross-sectional view taken along line XVII-XVII in FIG. [Figure 18] FIG. 18 is an exploded perspective view schematically showing the configuration of the aerial input display device according to the third embodiment. [Figure 19] FIG. 19 is a cross-sectional view taken along line XIX-XIX in FIG. [Figure 20] FIG. 20 is an exploded perspective view schematically showing the configuration of the aerial input display device according to the fourth embodiment. [Figure 21] FIG. 21 is a cross-sectional view taken along line XXI-XXI in FIG. [Figure 22] FIG. 22 is a top view of the aerial input display device according to the fourth embodiment. [Figure 23] FIG. 23 is an exploded perspective view schematically showing the configuration of the aerial input display device according to the fifth embodiment. [Figure 24] FIG. 24 is an exploded perspective view schematically showing the configuration of the aerial input display device according to the fifth embodiment. [Figure 25] FIG. 25 is a top view of the aerial input display device according to the fifth embodiment. [Figure 26] FIG. 26 is a diagram showing the aerial input display device of the first modification as viewed from the side. [Figure 27] FIG. 27 is a diagram showing the aerial input display device of the first modification as viewed from above. [Figure 28] FIG. 28 is a diagram showing the aerial input display device of the second modification as viewed from the side. [Figure 29]FIG. 29 is a diagram showing the aerial input display device of the second modification as viewed from above. [Figure 30] FIG. 30 is a diagram showing the aerial input display device of the third modification as viewed from above. [Figure 31] FIG. 31 is a diagram showing an example of a graphic displayed on the display device of the aerial input display device of the third modification. [Figure 32] FIG. 32 is a diagram showing an example of a graphic displayed on the display device of the aerial input display device of the third modification. [Figure 33] FIG. 33 is a diagram showing the aerial input display device of the fourth modification as viewed from above. [Figure 34] FIG. 34 is an exploded perspective view schematically showing the configuration of the aerial input display device of the fifth modification. [Figure 35] FIG. 35 is a cross-sectional view of the aerial input display device of the sixth modification. [Figure 36] FIG. 36 is a cross-sectional view of the aerial input display device of the sixth modification. [Figure 37] FIG. 37 is a top view of the aerial input display device of the sixth modification. [Figure 38] FIG. 38 is a cross-sectional view of the aerial input display device of the seventh modification. [Figure 39] FIG. 39 is a cross-sectional view of the aerial input display device of the eighth modification. [Figure 40] FIG. 40 is a cross-sectional view of the aerial input display device of the eighth modification. [Figure 41] FIG. 41 is a cross-sectional view of the aerial input display device of the ninth modification. [Figure 42] FIG. 42 is a cross-sectional view of the aerial input display device of the ninth modification. [Figure 43] FIG. 43 is a cross-sectional view of the aerial input display device of the eleventh modification. [Figure 44] FIG. 44 is a cross-sectional view of the aerial input display device of the eleventh modification. [Figure 45] FIG. 45 is a top view of a hologram sheet according to the twelfth modification. [Figure 46] FIG. 46 is a perspective view of an example of a light source according to the thirteenth modification. [Figure 47] FIG. 47 is a top view showing an example of an image formed by the aerial imaging device of the thirteenth modification. [Figure 48] FIG. 48 is a top view showing an example of an image formed by the aerial imaging device of the thirteenth modification. [Figure 49] FIG. 49 is a perspective view of an example of a light source according to the fourteenth modification. DETAILED DESCRIPTION OF THE INVENTION

[0035] An embodiment of the present invention 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.

[0036] In addition, terms used in this specification that specify shapes, geometric conditions, and their degrees, such as "parallel," "orthogonal," and "identical," as well as values ​​of lengths and angles, are not to be bound by strict meanings but are to be interpreted to include a range within which similar functions can be expected.

[0037] The aerial input display device 10 according to the first embodiment and the aerial input display device 10 according to the second embodiment will be described below.

[0038] First Embodiment First, an aerial input display device 10 and an aerial input device 20 according to the first embodiment will be described.

[0039] FIG. 1 shows an exploded perspective view of an aerial input display device 10 according to a first embodiment. As shown in FIG. 1, the aerial input display device 10 of the first embodiment includes a display device 11 and an aerial input device 20. The aerial input display device 10 displays an image using the display device 11 and forms an image in the air using the aerial input device 20. That is, a user of the aerial input display device 10 can visually recognize an image displayed on the display surface 12 of the display device 11 and an image formed at a position spaced apart from the display surface 12. The aerial input device 20 also allows the user to input information into the aerial input display device 10. Typically, a user of the aerial input display device 10 can input information into the aerial input display device 10 without touching the display surface 12 or the like by placing an object such as a finger at the position of the image formed in the air. For example, a user of the aerial input display device 10 can input information that they have selected one of multiple options, such as "yes," "no," "A," "B," "C," or "D."

[0040] The display device 11 has a display surface 12. The display device 11 can display an image on the display surface 12. The image displayed on the display surface 12 can be observed by a user of the aerial input display device 10 via the aerial input device 20. The display device 11 can be any display device such as a liquid crystal display, a plasma display, or an organic EL display. The display surface 12 of such a display device 11 is typically a glass surface.

[0041] Alternatively, the display device 11 may be one that displays an image by transmitting light through a printed transparent film or the like, or one that displays an image using light and dark by blocking part of the light with a light-blocking material. In this case, the display device 11 includes a light source that emits light and a predetermined pattern portion, such as a transparent film printed with a pattern corresponding to the image to be displayed or a light-blocking material having a shape corresponding to the image to be displayed. The surface of the transparent film or the non-formed portion of the light-blocking material serves as the display surface 12. As the light source, it is preferable to use, for example, a surface light source device that emits light in a planar manner in order to make the intensity of light transmitted through the predetermined pattern portion uniform.

[0042] Fig. 2 shows an example of an image displayed on the display surface 12 by the display device 11. In the example shown in Fig. 2, the letters A, B, C, and D are displayed in four rectangular frames on the display surface 12, respectively.

[0043] As shown in Fig. 1, the aerial input device 20 has a position detection sensor 21 and an aerial imaging device 30. The aerial input device 20 forms an image in the air using the aerial imaging device 30, and detects the presence of an object at a position 21s where the position detection sensor 21 is sensitive. By detecting the presence of an object, information on the detected position can be input. Furthermore, the position 21s where the position detection sensor 21 is sensitive corresponds to the position where the aerial imaging device 30 forms an image.

[0044] 1, each component of the aerial input device 20 is arranged on the side of the display surface 12 of the display device 11. Therefore, the aerial input device 20 can be installed as an afterthought to an existing display device 11. In other words, by providing the aerial input device 20 to an existing display device 11, it can function as the aerial input display device 10.

[0045] As shown in FIG. 1, aerial imaging device 30 includes light source 31 that emits light and hologram sheet 40. When irradiated with light, hologram sheet 40 forms a recorded image 37 at imaging position 38. Imaging position 38 is the position where image 37 is observed by a user. In particular, hologram sheet 40 forms image 37 using light from light source 31. The formed image 37 is observed by the user. In the example shown in FIG. 1, when irradiated with light, hologram sheet 40 forms image 37 on imaging plane 39. That is, image 37 formed by hologram sheet 40 is located on imaging plane 39. Imaging plane 39 is the plane closest to display surface 12 among planes that are parallel to display surface 12 of display device 11 and pass through imaging position 38.

[0046] Light source 31 irradiates hologram sheet 40 with light that forms the basis of image 37 formed by aerial imaging device 30. Light source 31 is preferably a point light source. That is, light source 31 preferably emits light that spreads from a single point. It is more preferable that light source 31 emits parallel light. An LED light, for example, can be used as such a light source 31. It is also preferable that light source 31 be a single light source. The light emitted by light source 31 contains a wavelength that reproduces image 37 recorded on hologram sheet 40.

[0047] When irradiated with light, hologram sheet 40 forms image 37 at imaging position 38. That is, hologram sheet 40 can form image 37 at a position spaced apart from hologram sheet 40. More specifically, hologram sheet 40 diffracts light to direct incident light toward a predetermined position, thereby forming image 37 at imaging position 38. In particular, in the illustrated example, imaging position 38 where hologram sheet 40 forms image 37 is located in the normal direction of display surface 12 of display device 11. In other words, imaging position 38 is located directly in front of display surface 12. Also, in the illustrated example, hologram sheet 40 forms an image on the side where light from light source 31 is incident. Therefore, hologram sheet 40 forms an image by reflecting light.

[0048] As shown in FIG. 1, hologram sheet 40 is provided on display surface 12 of display device 11. It is preferable that hologram sheet 40 have a high visible light transmittance so that display surface 12 of display device 11 can be observed through hologram sheet 40. Specifically, the visible light transmittance of hologram sheet 40 is preferably 50% or more, and more preferably 80% or more. The visible light transmittance can be determined as the average value of the transmittance at each wavelength measured using a spectrophotometer (Shimadzu Corporation's "UV-3100PC," compliant with JIS K 0115) within the measurement wavelength range of 380 nm to 780 nm.

[0049] As described above, hologram sheet 40 forms an image on the side where light from light source 31 is incident. In other words, light source 31 is located on the same side of hologram sheet 40 as imaging position 38. In the illustrated example, imaging position 38, where hologram sheet 40 forms an image, is located between light source 31 and hologram sheet 40. Distance D1 between imaging position 38 and hologram sheet 40 is preferably 10 mm or more and 100 mm or less, and more preferably 20 mm or more and 50 mm or less. Distance D1 between imaging position 38 and hologram sheet 40 is the distance between hologram sheet 40 and the portion of image 37 closest to hologram sheet 40.

[0050] 3 to 6 show specific examples of images 37 formed at imaging position 38 by hologram sheet 40. Each example of image 37 shown in FIGS. 3 to 6 will be described below.

[0051] In the example shown in FIG. 3, image 37 includes a plurality of dots regularly arranged at imaging position 38. Image 37 as shown in FIG. 3 allows a user to easily recognize imaging position 38 where image 37 is formed. Furthermore, when an image is formed by a light source other than light source 31, for example, ambient light such as surrounding lighting, the image is formed as a plurality of dots regularly arranged at positions shifted from image 37 formed by light source 31 on imaging plane 39. Images of a plurality of dots caused by light sources other than light source 31 are observed almost indistinguishable from image 37 of a plurality of dots caused by light source 31. Therefore, the visibility of imaging position 38 is unlikely to be impaired by images of light sources other than light source 31.

[0052] In the example shown in Fig. 4, the image 37 includes a plurality of lines regularly arranged two-dimensionally at the imaging position 38. According to the image 37 shown in Fig. 4, the imaging position 38 is defined by the plurality of lines. The imaging position 38 defined by the image 37 is easily recognized by the user. Therefore, the imaging position 38 at which the image 37 is formed can be easily recognized.

[0053] In the example shown in Fig. 5, image 37 includes a plurality of points irregularly arranged at image position 38. According to image 37 shown in Fig. 5, when an image is formed by a light source other than light source 31, for example, ambient light such as surrounding lighting, the image is formed as a plurality of points irregularly arranged at positions shifted from image 37 formed by light source 31 on image plane 39. Images of a plurality of points caused by light sources other than light source 31 are observed indistinguishable from image 37 of a plurality of points caused by light source 31. Therefore, the visibility of image position 38 is not particularly likely to be impaired by images of light sources other than light source 31.

[0054] In the example shown in FIG. 6, the image 37 includes multiple designs regularly arranged at the imaging position 38. In the illustrated example, the image 37 includes multiple XYZ character strings as the design. However, the image 37 is not limited to the illustrated example, and may include marks such as figures and symbols, or a combination of letters and figures, symbols, etc. The image 37 shown in FIG. 6 can be given a design. Furthermore, by observing the designs, the imaging position 38 can be easily recognized. Therefore, the imaging position 38 where the image 37 is formed can be easily recognized.

[0055] The image 37 at the imaging position 38 is formed of any one of dots, a grid, and a design pattern, as exemplified in Figures 3 to 6, or a combination thereof. The sum of the areas of the images 37 observed in a direction perpendicular to the display surface 12 (the vertical direction DA shown in Figure 1) is preferably 0.1% to 60% of the area of ​​the display surface 12, and more preferably 1% to 30%. When the sum of the areas of the images 37 is sufficient, the user can properly observe the images 37. Furthermore, when the sum of the areas of the images 37 is not too large compared to the display surface 12, the user can properly observe the image displayed on the display surface 12.

[0056] Also, as shown in Figure 7, hologram sheet 40 includes a base layer 41, a hologram layer 45 supported by base layer 41, a bonding layer 43 that bonds base layer 41 and hologram layer 45, a surface layer 47 that is laminated on hologram layer 45 and forms the surface of hologram sheet 40, and an adhesive layer 49 for bonding hologram sheet 40 to display surface 12 of display device 11.

[0057] Base layer 41 supports hologram layer 45. Base layer 41 is what is generally called a transparent film that transmits wavelengths in the visible light wavelength band (380 nm to 780 nm). Base layer 41 may be made of any material that is transparent and can appropriately support hologram layer 45, and examples of such materials include polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polystyrene, and cyclic polyolefin. Furthermore, in consideration of transparency, appropriate support and durability of hologram layer 45, base layer 41 preferably has a thickness of 10 μm or more and 100 μm or less.

[0058] The bonding layer 43 bonds the base layer 41 and the hologram layer 45. The bonding layer 43 can be made of a material having various adhesive or sticky properties. The bonding layer 43 preferably has a high visible light transmittance. A typical example of the material for the bonding layer 43 is an acrylic adhesive material. The thickness of the bonding layer 43 is, for example, 5 μm or more and 50 μm or less.

[0059] The hologram layer 45 functions to focus incident light at the imaging position 38 in the hologram sheet 40. The hologram layer 45 is preferably a volume hologram (also known as a Lippmann hologram). In the illustrated example, the hologram sheet 40 focuses an image on the side where light from the light source 31 is incident. Therefore, the hologram layer 45 is a reflection hologram that focuses an image by reflecting light. The hologram layer 45 can be made of, for example, a hardened silver halide photosensitive material, dichromated gelatin, a crosslinked polymer, a photopolymer, or the like. The thickness of the hologram layer 45 is, for example, 1 μm to 100 μm, more preferably 5 μm to 40 μm.

[0060] The surface layer 47 forms the surface of the hologram sheet 40 and functions as a protective layer that protects the hologram layer 45 from the outside. The surface layer 47 is transparent and may be made of any material that can adequately protect the hologram layer 45, such as polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polystyrene, and cyclic polyolefin. The thickness of the surface layer 47 is, for example, 10 μm to 100 μm. Furthermore, the surface layer 47 may be imparted with a certain function. Examples of functions that can be imparted to the surface layer 47 include an antibacterial function, an antiviral function, an alcohol-resistant function, a low-reflection (LR) function, a hard coat (HC) function with scratch resistance, an infrared shielding (reflective) function, an ultraviolet shielding (reflective) function, an antifouling function, and a bonding function. The surface layer 47 may be imparted with two or more functions. In particular, imparting the surface layer 47 with an antibacterial or antiviral function can prevent contact infection with bacteria, viruses, and the like even if a user comes into contact with the hologram sheet 40. Furthermore, since surface layer 47 is provided with an alcohol resistance function, the surface of hologram sheet 40 can be disinfected with alcohol. Disinfecting the surface with alcohol can prevent contact infection with bacteria, viruses, etc., even if a user accidentally comes into contact with hologram sheet 40.

[0061] The adhesive layer 49 is a layer for adhering the hologram sheet 40 to the display surface 12 of the display device 11. The adhesive layer 49 can be peeled off from a member to which it has been adhered, and is preferably re-adherable after being peeled off. Furthermore, it is preferable that the adhesive layer 49 has a high visible light transmittance. Examples of such adhesive layers 49 include urethane-based adhesives, silicone-based adhesives, and acrylic-based adhesives. The thickness of the adhesive layer 49 is, for example, 5 μm or more and 50 μm or less.

[0062] The position detection sensor 21 detects the position of an object in a sensitive region, particularly a surface. The position detection sensor 21 may detect not only the position but also the movement of an object. The position detection sensor 21 detects the position of an object using, for example, infrared light. The position detection sensor 21 is configured and arranged so that it is sensitive to a position corresponding to an imaging position 38 where an image 37 is formed. In other words, the position 21s where the position detection sensor 21 is sensitive is indicated by the imaging position 38 where the image 37 is formed. The position 21s where the position detection sensor 21 is sensitive may coincide with an imaging plane 39, which is the closest plane to the display surface 12 of the display device 11 and passes through the imaging position 38. However, the position 21s where the position detection sensor 21 is sensitive may be located at a distance D1 from the hologram sheet 40 relative to the imaging position 38. In other words, the distance D1 between the imaging position 38 and the hologram sheet 40 is shorter than the distance D2 between the position 21s where the position detection sensor 21 is sensitive and the hologram sheet 40. Specifically, the distance D1 between the imaging position 38 and the hologram sheet 40 is preferably 1 mm or more and 20 mm or less shorter than the distance D2 between the position 21s at which the position detection sensor 21 is sensitive and the hologram sheet 40, and more preferably 5 mm or more and 10 mm or less shorter.

[0063] FIG. 8 shows a top view of the air input device 20. In the example shown in FIG. 8, the letters A, B, C, and D are displayed in four rectangular frames on the display surface 12 of the display device 11, and an image 37 is formed at an imaging position 38 on the display surface 12. FIG. 9 shows a cross-sectional view taken along line IX-IX in FIG. 8. In the examples shown in FIGS. 8 and 9, the position detection sensor 21 detects the presence of an object at a position overlapping the letters A, B, C, and D displayed on the display surface 12. In this air input device 20, when a user points with a finger F at a character drawn on the display surface 12 at a position 21s where the position detection sensor 21 is sensitive, the position detection sensor 21 detects the pointed position. The character pointed to by the user is identified from the position on the display surface 12 corresponding to the detected position. By identifying the pointed character, information about the character pointed to by the user can be input.

[0064] Next, a method for manufacturing the hologram layer 45 and the hologram sheet 40 will be described with reference to FIGS.

[0065] First, as shown in FIG. 10 , a hologram-sensitive material 57a and a pattern mask 53 are provided on a glass substrate 51. Examples of the hologram-sensitive material 57a include silver halide-sensitive materials, dichromated gelatin, cross-linked polymers, and photopolymers. Photopolymers are particularly preferred as the material for the hologram-sensitive material 57a because they are dry materials that harden when irradiated with ultraviolet light and are suitable for mass production. The photopolymer contains at least one photopolymerizable compound and a photopolymerization initiator. The pattern mask 53 has openings 53a. The openings 53a block light in areas where the openings 53a are not provided, but allow light to pass through in areas where the openings 53a are provided. The openings 53a form a pattern shape in the pattern mask 53 corresponding to the position of the image 37 formed by the hologram sheet 40. For example, the pattern mask 53 does not have openings 53a at a position that overlaps the image 37 formed by the hologram sheet 40.

[0066] Next, ultraviolet light is irradiated through pattern mask 53, as shown by the arrows in FIG. 10. The ultraviolet light is blocked in areas of pattern mask 53 where openings 53a are not formed. On the other hand, in areas where openings 53a are formed, the ultraviolet light passes through pattern mask 53 and is irradiated onto hologram sensitive material 57a. The hologram sensitive material 57a irradiated with ultraviolet light is hardened. That is, the hologram sensitive material 57a is hardened in areas other than the pattern shape corresponding to pattern mask 53. The hardened areas of hologram sensitive material 57a become insensitive areas 57b where no hologram is recorded. That is, even if light for imaging a hologram is irradiated later, no hologram will be formed in insensitive areas 57b.

[0067] Thereafter, as shown in FIG. 11, the pattern mask 53 is removed. A first hologram master 55 is placed on the opposite side of the glass substrate 51 from the side on which the hologram-sensitive material 57a is provided. A hologram is recorded entirely on the first hologram master 55. In this state, light, particularly a parallel beam of light, is irradiated onto the hologram-sensitive material 57a, as indicated by the arrows in FIG. 11. The light directly irradiating the hologram-sensitive material 57a serves as reference light, while the diffracted light that passes through the hologram-sensitive material 57a and is diffracted by the first hologram master 55 serves as object light. The object light and the reference light interfere with each other, generating interference fringes, which are light-dark patterns, in the hologram-sensitive material 57a. These interference fringes are then recorded on the photosensitive hologram-sensitive material 57a. On the other hand, no interference fringes are recorded on the insensitive portions 57b. Interference fringes are recorded at a position overlapping with the image 37 formed by the hologram sheet 40, and a second hologram master 57 is produced from the hologram sensitive material 57a.

[0068] The light irradiated onto the hologram sensitive material 57a, i.e., the object light and reference light, may be, for example, an argon ion laser (wavelengths 457.9 nm, 476.5 nm, 488.0 nm, 514.5 nm), a krypton ion laser (wavelength 647.1 nm), a helium-neon laser (wavelength 632.8 nm), or a YAG laser (wavelength 532 nm). The light irradiated here has a wavelength included in the light irradiated from the light source 31.

[0069] 12, hologram sensitive material 45a forming hologram layer 45 and second hologram master 57 manufactured by the above-described process are disposed apart from each other. The distance between hologram sensitive material 45a and second hologram master 57 is the distance between hologram layer 45 and imaging position 38 where image 37 recorded in hologram layer 45 to be manufactured is formed. In other words, by adjusting the distance between hologram sensitive material 45a and second hologram master 57, the distance between hologram layer 45 and imaging position 38 where image 37 recorded in hologram layer 45 is formed can be adjusted. In the example shown in FIG. 12, a substrate 52 made of glass, transparent resin, or the like is provided between hologram sensitive material 45a and second hologram master 57 to separate hologram sensitive material 45a and second hologram master 57 by a desired distance. Alternatively, the space between the hologram sensitive material 45a and the second hologram master 57 may be air or the like, provided that they are spaced a desired distance apart. Thereafter, as indicated by the arrows in FIG. 12 , light is irradiated onto the hologram sensitive material 45a, thereby generating interference fringes, which are light and dark patterns, in the hologram sensitive material 45a, similar to the manufacturing process of the second hologram master 57 described above. The interference fringes are generated at positions where the interference fringes are generated in the second hologram master 57, i.e., positions that overlap with the image 37 formed by the hologram sheet 40. In this manner, the hologram layer 45 is manufactured.

[0070] The manufactured hologram layer 45 is bonded to base layer 41 via bonding layer 43, and an adhesive layer 49 is provided on the side of base layer 41 opposite to the side on which hologram layer 45 is provided. In addition, a surface layer 47 is provided on the side of hologram layer 45 opposite to the side on which base layer 41 is provided. In this manner, hologram sheet 40 as shown in FIG. 7 is manufactured. Note that a peelable separator may be provided on adhesive layer 49 to prevent adhesive layer 49 from unintentionally adhering to other members.

[0071] Next, the operation of the aerial imaging device 30 and the aerial input device 20 according to the first embodiment will be described.

[0072] As shown in FIG. 9, first, light is emitted from light source 31 onto hologram sheet 40. The light emitted onto hologram sheet 40 is diffracted at the portion of hologram sheet 40 where interference fringes are generated in hologram layer 45. That is, hologram layer 45 diffracts light based on the recorded pattern. The light diffracted by hologram layer 45 is focused at imaging position 38, forming image 37 based on the recorded pattern. In this way, an image is formed in the air by the light from light source 31. That is, the light emitted from light source 31 becomes reproduction light that reproduces the hologram.

[0073] A position detection sensor 21 having detection sensitivity is disposed at a position corresponding to the imaging position 38. When an object, for example, a user's finger F, is placed at a position 21s at which the position detection sensor 21 is sensitive, the position detection sensor 21 detects the position of the finger F. The position detection sensor 21 enables the air input device 20 to identify the position pointed to by the finger F and input information about that position. In particular, the position 21s at which the position detection sensor 21 is sensitive can be easily recognized by the image 37 formed at the imaging position 38.

[0074] However, there is a demand for providing existing display devices with equipment that allows users to input information appropriately without touching the display surface. In particular, there is a demand for such equipment to be installed easily and at low cost in order to take early measures against contact infection. However, simply installing a non-contact position detection sensor may not be able to properly recognize the position to which the position detection sensor is sensitive. For this reason, installing such a sensor on an existing display device makes it difficult to properly input information and may result in unintentional contact with the display surface. Meanwhile, equipment that combines an aerial imaging device and a non-contact position detection sensor is difficult to install on existing display devices due to optical layout constraints.

[0075] On the other hand, the air input device 20 of the first embodiment has a position detection sensor 21. A position 21s at which the position detection sensor 21 is sensitive is separated from the hologram sheet 40. That is, the position detection sensor 21 can detect positions in a non-contact manner. The air input device 20 also has a light source 31 and a hologram sheet 40 that forms an image 37 at an imaging position 38 using light from the light source 31. The position detection sensor 21, the light source 31, and the hologram sheet 40 are disposed on the side of the display surface 12 of the display device 11. Therefore, the position detection sensor 21, the light source 31, and the hologram sheet 40 can be easily provided in an existing display device 11 to form the air input display device 10. Furthermore, the hologram sheet 40 makes it easy to recognize the imaging position 38 at which the image 37 is formed. The position 21s at which the position detection sensor 21 is sensitive corresponds to the imaging position 38. By recognizing the imaging position 38, the user of the aerial input device 20 can recognize the position 21s at which the position detection sensor 21 is sensitive. In other words, the aerial imaging device 30, which allows the user to recognize the position that can be detected by the non-contact position detection sensor 21, can be easily installed in an existing display device 11 to form the aerial input device 20.

[0076] Furthermore, the distance between imaging position 38 and hologram sheet 40 is 10 mm or more. Because imaging position 38 and hologram sheet 40 are sufficiently spaced apart, for example, if position detection sensor 21 has detection sensitivity aligned with imaging position 38, finger F is unlikely to touch hologram sheet 40 when pointing at image 37. This makes it possible to prevent contact infection of viruses and the like on hologram sheet 40. It also prevents fingerprints and other dirt from adhering to hologram sheet 40, which can make it difficult to form an image.

[0077] The distance between imaging position 38 and hologram sheet 40 is preferably 100 mm or less. Since imaging position 38 and hologram sheet 40 are not too far apart, it becomes easy to simultaneously recognize image 37 formed at imaging position 38 and display surface 12 of display device 11 on which hologram sheet 40 is provided.

[0078] Furthermore, light source 31 is a point light source. That is, light source 31 emits light that diverges from a single point. The light from light source 31 is diffracted by hologram sheet 40 and forms an image at imaging position 38 at a position corresponding to light source 31. If light source 31 were to diffuse linearly or planarly, the light diffracted by hologram sheet 40 would also diffuse linearly or planarly, and the formed image would also diffuse linearly or planarly. In other words, image 37 formed by hologram sheet 40 would be blurred. Because light source 31 is a point light source, the light from light source 31 is less likely to diffuse, thereby making image 37 formed by hologram sheet 40 clearer. This makes it easier to identify imaging position 38. In other words, it makes it easier to identify position 21s to which position detection sensor 21 is sensitive. Furthermore, because light source 31 is a point light source, the entire hologram sheet 40 can be illuminated with light from light source 31 even if the distance between light source 31 and hologram sheet 40 is small. Therefore, the aerial input device 20 can be made smaller.

[0079] Alternatively, light source 31 emits parallel light. The light from light source 31 is diffracted by hologram sheet 40 and forms an image at imaging position 38 at a position corresponding to light source 31. In hologram sheet 40, image 37 is irradiated with parallel light as reference light. Therefore, since the light from light source 31, which serves as reconstruction light, is parallel light, image 37 formed by hologram sheet 40 can be made clearer. This makes it easier to recognize imaging position 38. In other words, it becomes easier to recognize position 21s to which position detection sensor 21 is sensitive.

[0080] Hologram sheet 40 includes hologram layer 45, which is a volume hologram. Volume holograms make it difficult for second-order or higher diffracted light to occur. This allows light incident on hologram sheet 40 to be efficiently focused at imaging position 38. In other words, imaging position 38 becomes easier to recognize, and therefore position 21s, to which position detection sensor 21 is sensitive, becomes easier to recognize.

[0081] The visible light transmittance of hologram sheet 40 is 50% or more. Since the visible light transmittance of hologram sheet 40 is sufficiently high, visibility through hologram sheet 40 is unlikely to be impaired. For example, display surface 12 of display device 11 to which hologram sheet 40 is attached can be clearly observed through hologram sheet 40.

[0082] The image 37 at the imaging position 38 is composed of a dot, a grid, a design pattern, or a combination thereof. The sum of the areas of the images 37 observed from a direction perpendicular to the display surface 12 is 0.1% to 60% of the area of ​​the display surface 12. Because the images 37 are formed to have a sufficient sum of areas, the user can easily recognize the imaging position 38 by observing the images 37. This makes it easier to recognize the position 21s to which the position detection sensor 21 is sensitive. Furthermore, because the sum of the areas of the images 37 is not excessive, the display surface 12 can be observed through the images 37. Furthermore, because an appropriate proportion of the image 37 is not present in the imaging position 38, parallax is generated between the user's eyes, allowing the image 37 to be observed three-dimensionally. In other words, the image 37 is observed as if it were located at a distance from the hologram sheet 40.

[0083] <Second embodiment> Next, an aerial input display device 10 and an aerial input device 20 according to a second embodiment will be described. Note that, in the aerial input display device 10 of the second embodiment, parts that can be configured in the same way as the aerial input display device 10 of the first embodiment described above will be denoted by the same reference numerals as those used for the corresponding parts in the first embodiment described above, and duplicated explanations will be omitted.

[0084] Fig. 13 shows an exploded perspective view of an aerial input display device 10 according to the second embodiment. As shown in Fig. 13, the aerial input display device 10 of the second embodiment includes a display device 11 and an aerial input device 20. As in the first embodiment, a user of the aerial input display device 10 can input information to the aerial input display device 10 without touching the display surface 12 of the display device 11 by placing an object such as a finger at the position of an image formed in the air.

[0085] The display device 11 can function as a notification means 25 of the aerial input device 20, which will be described later. FIG. 14 shows an example of an image displayed on the display surface 12 by the display device 11, which functions as the notification means 25. In the example shown in FIG. 14, the peripheries of four rectangular frames can be displayed on the display surface 12, corresponding to an image 37 formed at an imaging position 38, which will be described later. In the example shown, the periphery of only one frame is displayed. Note that the display device 11 may be capable of displaying information other than that displayed as the notification means 25. Alternatively, if a member other than the display device 11 functions as the notification means 25, the display device 11 does not need to have the function of the notification means 25.

[0086] As shown in FIG. 13 , the aerial input device 20 has a position detection sensor 21, an aerial imaging device 30, and a notification means 25. The aerial input device 20 forms an image in the air using the aerial imaging device 30, and detects the presence of an object at a position 21s where the position detection sensor 21 is sensitive. By detecting the presence of an object, the position detection sensor 21 can input information about the detected position. Furthermore, the aerial input device 20 outputs information about the detected position using the notification means 25 to notify the user. The position 21s where the position detection sensor 21 is sensitive corresponds to the position where the aerial imaging device 30 forms an image 37.

[0087] 13, the components of the aerial input device 20 other than the notification means 25 are arranged on the side of the display surface 12 of the display device 11. In addition, the display device 11 functions as the notification means 25. Therefore, the aerial input device 20 can be installed as an afterthought to an existing display device 11. In other words, by providing the aerial input device 20 to an existing display device 11, it can be made to function as the aerial input display device 10.

[0088] 13, aerial imaging device 30 includes light source 31 that emits light and hologram sheet 40. Hologram sheet 40 forms image 37 at imaging position 38 using light from light source 31. Image 37 formed by hologram sheet 40 indicates a plurality of detection positions that can be distinguished and recognized by position detection sensor 21 at imaging position 38. In particular, hologram sheet 40 forms image 37 at imaging position 38, indicating the position where a finger or the like should be placed.

[0089] FIG. 15a shows a specific example of an image 37 formed at imaging position 38 by hologram sheet 40. In the example shown in FIG. 15a, image 37 includes four rectangular frames at imaging position 38, with the letters A, B, C, and D positioned within each frame. These frames indicate positions where an object, such as a finger, should be placed at imaging position 38. Position detection sensor 21 can detect the presence of an object at a position corresponding to each frame. That is, each frame indicates a plurality of detection positions that position detection sensor 21 can distinguish and recognize. Note that image 37 formed at imaging position 38 may be any type of image as long as it can correspond to a plurality of detection positions that position detection sensor 21 can distinguish and recognize. For example, image 37 may be a numeric keypad, keyboard, etc.

[0090] FIG. 15b shows an example of image 37 formed by hologram sheet 40 at imaging position 38, different from that shown in FIG. 15a. The example shown in FIG. 15b is image 37 formed by hologram sheet 40 when, for example, display device 11 is an automobile navigation device. In the example shown in FIG. 15b, image 37 shows a display similar to a selection screen for functions, etc., displayed on the screen of a typical automobile navigation device. In the example shown in FIG. 15b, image 37 includes six rectangular frames at imaging position 38 and icons indicating navigation device functions arranged within each frame. In this case, position detection sensor 21 can also detect the presence of an object at a position corresponding to each frame.

[0091] Similarly to the first embodiment, the hologram sheet 40 includes a base layer 41, a hologram layer 45, a bonding layer 43, a surface layer 47, and an adhesive layer 49.

[0092] The notification means 25 provides a notification corresponding to the detected position. More specifically, when the position detection sensor 21 detects the presence of an object, the notification means 25 notifies the user of information based on the detected position of the object. In the illustrated example, the notification means 25 is a rectangular frame displayed on the display surface 12 of the display device 11. In this example, when the position detection sensor 21 detects the presence of an object such as a finger, the notification means 25 displays a rectangular frame on the display surface 12 of the display device 11 at a position corresponding to the position where the object was detected. Note that the notification means 25 is not limited to the illustrated example, and may be a display means separate from the display device 11. Alternatively, the notification means 25 may be a means other than a display means, for example, a sound emitted from a speaker or the like.

[0093] Fig. 16 shows a top view of the air input device 20. In the example shown in Fig. 16, four rectangular frames and the letters A, B, C, and D arranged within each frame are formed as an image 37 at an imaging position 38 on the display surface 12. In addition, the periphery of one rectangular frame is displayed on the display surface 12 of the display device 11 as the notification means 25. The example shown shows a state in which information on the letter A is being input in the air input device 20. In other words, the periphery of the rectangular frame displayed on the display surface 12 overlaps with the frame of the letter A in the image 37.

[0094] The hologram sheet 40 according to the second embodiment can be manufactured by the same process as that for the hologram sheet 40 according to the first embodiment.

[0095] Next, the operation of the aerial imaging device 30 and the aerial input device 20 according to the second embodiment will be described with reference to Fig. 17. Fig. 17 is a cross-sectional view taken along line XVII-XVII in Fig. 16.

[0096] As shown in FIG. 17, first, light is emitted from light source 31 onto hologram sheet 40. The light emitted onto hologram sheet 40 is diffracted at the portion of hologram sheet 40 where interference fringes are generated in hologram layer 45. That is, hologram layer 45 diffracts light based on the recorded pattern. The light diffracted by hologram layer 45 is focused at imaging position 38, forming image 37 based on the recorded pattern. In this way, an image is formed in the air by the light from light source 31. That is, the light emitted from light source 31 becomes reproduction light that reproduces the hologram.

[0097] A position detection sensor 21 having detection sensitivity is disposed at a position corresponding to the imaging position 38. Therefore, the position 21s at which the position detection sensor 21 is sensitive can be easily recognized by the image 37 formed at the imaging position 38. When an object, such as a user's finger F, is placed at the position 21s at which the position detection sensor 21 is sensitive, the position detection sensor 21 detects the position of the finger F. The position detection sensor 21 enables the air input device 20 to identify the position pointed at by the finger F and input information about the position. In the example shown in FIGS. 16 and 17 , the position detection sensor 21 detects the presence of an object by distinguishing positions in a frame in which the letters A, B, C, and D imaged at the imaging position 38 are arranged. In such an air input device 20, when the user points at the letter imaged at the imaging position 38 with the finger F at the position 21s at which the position detection sensor 21 is sensitive, the position detection sensor 21 detects the pointed position. The letter pointed at by the user is identified from the position on the display surface 12 corresponding to the detected position. By identifying the character being pointed at, the user can input information about the character being pointed at. Furthermore, notification means 25 notifies the user of the information being input. Specifically, a rectangular frame corresponding to the information being input is displayed on display surface 12 as notification means 25. The frame displayed on display surface 12 as notification means 25 can be observed by the user, allowing the user to confirm the information input with a finger or the like.

[0098] The air input device 20 of the second embodiment has a position detection sensor 21. A position 21s at which the position detection sensor 21 is sensitive is separated from the hologram sheet 40. That is, the position detection sensor 21 can detect positions in a non-contact manner. The air input device 20 also has a light source 31 and a hologram sheet 40 that forms an image 37 at an imaging position 38 using light from the light source 31. The light source 31 and the hologram sheet 40 are disposed on the side of the display surface 12 of the display device 11. Therefore, the light source 31 and the hologram sheet 40 can be easily installed in an existing display device 11. Furthermore, the hologram sheet 40 forms an image 37 at the imaging position 38, indicating the position at which a finger or the like should be placed. The position 21s at which the position detection sensor 21 is sensitive corresponds to the imaging position 38. A user of the air input device 20 can recognize the position 21s at which the position detection sensor 21 is sensitive by observing the image 37 formed at the imaging position 38. That is, the aerial imaging device 30 that allows the user to recognize the position that can be detected by the non-contact position detection sensor 21 can be easily provided on an existing display device.

[0099] In particular, the aerial input device 20 of the second embodiment indicates a plurality of detection positions that can be distinguished and recognized by the position detection sensor 21 at the imaging position 38. The user can recognize the plurality of detection positions that can be distinguished and recognized by the position detection sensor 21 by observing the image 37 formed at the imaging position 38. This allows the user to select and input information based on the image 37 formed at the imaging position 38.

[0100] The aerial input device 20 of the second embodiment also has a notification means 25 that issues a notification corresponding to the detected position. The notification by the notification means 25 allows the user to confirm whether the information they input is the information they intended.

[0101] <Third embodiment> Next, an aerial input display device 10 and an aerial input device 20 according to a third embodiment will be described. Note that, in the aerial input display device 10 of the third embodiment, parts that can be configured in the same way as the aerial input display device 10 of the first and second embodiments described above will be denoted by the same reference numerals as those used for the corresponding parts in the first and second embodiments described above, and duplicated explanations will be omitted.

[0102] Fig. 18 is an exploded perspective view of the aerial input display device 10 according to the third embodiment. Fig. 19 is a cross-sectional view taken along line XIX-XIX in Fig. 18. As shown in Figs. 18 and 19, the aerial input display device 10 according to the third embodiment includes a display device 11 and an aerial input device 20. The aerial imaging device 30 includes a light source 31 that emits light, and a hologram sheet 40. The hologram sheet 40 forms an image 37 at an imaging position 38 using light from the light source 31.

[0103] 18 and 19, image 37 has a plurality of portions that are different in distance from hologram sheet 40. In the example shown in Figures 18 and 19, image 37 formed by hologram sheet 40 has sensor corresponding portion 37a and mark portion 37b as a plurality of portions that are different in distance from hologram sheet 40.

[0104] The sensor corresponding portion 37a is imaged at a sensor corresponding position 38a, which is a position corresponding to the position 21s to which the position detection sensor 21 is sensitive. This allows a user of the aerial input display device 10 to input information to the aerial input display device 10 without touching the display surface 12 of the display device 11, by placing an object such as a finger at the sensor corresponding position 38a.

[0105] 19, the sensor corresponding portion 37a indicates a plurality of detection positions that can be distinguishably recognized by the position detection sensor 21 at the sensor corresponding position 38a, similar to the image 37 of the aerial input display device 10 according to the second embodiment. In particular, in the example shown in Fig. 19, the sensor corresponding portion 37a is four rectangular frames and the letters A, B, C, and D arranged within each frame.

[0106] The image 37 has a sensor corresponding portion 37a and a mark portion 37b. The mark portion 37b is imaged at a mark position 38b that is spaced apart from the hologram sheet 40 by a distance D1-2 that is different from the distance D1-1 between the sensor corresponding portion 37a and the hologram sheet 40.

[0107] Mark portion 37b is formed of, for example, any one of dots, grids, and design patterns, or a combination thereof, as illustrated in Figures 3 to 6 described in the first embodiment, which allows the user to easily recognize mark position 38b where mark portion 37b is imaged.

[0108] The following effect is obtained by forming an image of mark portion 37b at a position spaced apart from hologram sheet 40 by a distance different from distance D1-1 between sensor corresponding portion 37a and hologram sheet 40. By allowing the user to view mark portion 37b, which is spaced apart from hologram sheet 40 by a distance different from that of sensor corresponding portion 37a, along with sensor corresponding portion 37a, the three-dimensional effect of sensor corresponding portion 37a as seen by the user can be emphasized. In particular, the user can be made to clearly recognize that sensor corresponding portion 37a is spaced apart from hologram sheet 40. From the viewpoint of clearly recognizing that sensor corresponding portion 37a is spaced apart from hologram sheet 40, it is preferable that distance D1-2 between mark portion 37b and hologram sheet 40 be smaller than distance D1-1 between sensor corresponding portion 37a and hologram sheet 40.

[0109] <Fourth embodiment> Next, an aerial input display device 10 and an aerial input device 20 according to a fourth embodiment will be described. Note that, in the aerial input display device 10 of the fourth embodiment, parts that can be configured in the same way as the aerial input display device 10 of the first to third embodiments described above will be denoted by the same reference numerals as those used for the corresponding parts in the first to third embodiments described above, and duplicated explanations will be omitted.

[0110] Fig. 20 is an exploded perspective view of the aerial input display device 10 according to the fourth embodiment. Fig. 21 is a cross-sectional view taken along line XXI-XXI in Fig. 20. As shown in Figs. 20 and 21, the aerial input display device 10 according to the fourth embodiment includes a display device 11 and an aerial input device 20. The aerial imaging device 30 includes a light source 31 that emits light, and a hologram sheet 40. The hologram sheet 40 forms an image 37 at an imaging position 38 using light from the light source 31.

[0111] In the fourth embodiment, similarly to the third embodiment, image 37 has a plurality of portions that are at different distances from hologram sheet 40. In the example shown in Figures 20 and 21, image 37 formed by hologram sheet 40 has guide portion 37c as a plurality of portions that are at different distances from hologram sheet 40, in addition to sensor corresponding portion 37a described in the third embodiment. Guide portion 37c is formed at a position that is spaced apart from hologram sheet 40 by distance D1-3, which is longer than distance D1-1 between sensor corresponding portion 37a and hologram sheet 40.

[0112] 22 is a diagram showing the aerial input display device 10 according to the fourth embodiment as observed from a direction perpendicular to the display surface 12 (vertical direction DA shown in FIG. 20), particularly as observed from above in FIG. 20. The guide portion 37c has an opening 37c1. The opening 37c1 of the guide portion 37c overlaps with the sensor corresponding portion 37a when observed from a direction perpendicular to the display surface 12 (vertical direction DA shown in FIG. 20).

[0113] 22, the sensor corresponding portion 37a is four rectangular frames and the letters A, B, C, and D arranged within each frame. When the aerial input display device 10 is observed from a direction perpendicular to the display surface 12, the periphery of the guide portion 37c overlaps with the four rectangular frames of the sensor corresponding portion 37a. The opening 37c1 overlaps with the letter portions of the sensor corresponding portion 37a.

[0114] The following effect is obtained by imaging the guide portion 37c. By prompting the user to pass a finger or the like through the opening 37c1 when placing the finger or the like at the sensor corresponding position 38a, the user's finger or the like entering the sensor corresponding position 38a and the position 21s where the position detection sensor 21 is sensitive can be made to be at an angle close to perpendicular to the display surface 12. This makes it possible to prevent erroneous detection by the position detection sensor 21 caused by the user's finger or the like being tilted with respect to the display surface 12. For example, it is possible to prevent the position detection sensor 21 from erroneously detecting that the letter B has been pointed to, even though the user actually points to the letter A on the sensor corresponding portion 37a, because the user's finger is tilted significantly with respect to the display surface 12.

[0115] <Fifth embodiment> Next, an aerial input display device 10 and an aerial input device 20 according to a fifth embodiment will be described. Note that, in the aerial input display device 10 of the fifth embodiment, parts that can be configured in the same way as the aerial input display device 10 of the first to fourth embodiments described above will be denoted by the same reference numerals as those used for the corresponding parts in the first to fourth embodiments described above, and duplicated explanations will be omitted.

[0116] Fig. 23 is an exploded perspective view of an aerial input display device 10 according to a fifth embodiment. As shown in Fig. 23, the aerial input display device 10 of the fifth embodiment includes a display device 11 and an aerial input device 20. The aerial imaging device 30 includes a light source 31 that emits light, and a hologram sheet 40. The hologram sheet 40 forms an image 37 at an imaging position 38 using light from the light source 31.

[0117] In the air input device 20 according to the fifth embodiment, the hologram sheet 40 can separately form a plurality of different images 37. As an example, the hologram sheet 40 records a plurality of different images 37. Furthermore, the light source 31 of the air input display device 10 includes a plurality of portions at different positions. In particular, the plurality of portions are arranged in positions with different directions relative to the hologram sheet 40. The hologram sheet 40 forms one of the plurality of recorded images 37 using light from one of the plurality of portions of the light source 31. Furthermore, the hologram sheet 40 forms another of the plurality of recorded images 37 using light from another one of the plurality of portions of the light source 31. This allows the hologram sheet 40 to form a plurality of different images 37.

[0118] FIG. 24 is an exploded perspective view of the aerial input display device 10 according to the fifth embodiment, in which the hologram sheet 40 forms an image 37 different from the image 37 formed in FIG. 23. In the example shown in FIGS. 23 and 24, the light source 31 of the aerial input device 20 includes a first light source 311 and a second light source 312. The hologram sheet 40 also records a first image 371 and a second image 372. As an example, the hologram sheet 40 forms the first image 371 as shown in FIG. 23 using light from the first light source 311. The hologram sheet 40 also forms the second image 372 as shown in FIG. 24 using light from the second light source 312.

[0119] A first image 371 shown in Fig. 23 includes four rectangular frames and the letters A, B, C, and D arranged within each frame. A second image 372 shown in Fig. 24 differs from the first image 371 only in the frame where the letter A was arranged in the first image 371. The second image 372 has a shape such that an image is formed within the frame where the letter A was arranged in the first image 371, excluding the area where the letter A was formed.

[0120] The following effect can be obtained by allowing hologram sheet 40 to form first image 371 using light from first light source 311 and second image 372 using light from second light source 312. By switching first light source 311 and second light source 312 on and off, it is possible to change image 37 formed by hologram sheet 40. For example, as shown in FIG. 23 , a state in which first image 371 is formed can be changed to a state in which second image 372 is formed by turning first light source 311 off and second light source 312 on.

[0121] The aerial input display device 10 changes the formed image 37 in accordance with the result of object detection by the position detection sensor 21. By changing the formed image 37, for example, it is possible to notify the user of the aerial input display device 10 of the result of object detection by the position detection sensor 21. For example, when the position detection sensor 21 detects the presence of an object such as a finger and information of the letter A is input, it is possible to notify the user that information of the letter A has been input by changing the formed image 37 from a first image 371 to a second image 372.

[0122] When the result of object detection by position detection sensor 21 is notified to the user by changing formed image 37 from first image 371 to second image 372, the shape of second image 372 is not particularly limited as long as the user can recognize the result of object detection by position detection sensor 21. For example, when the user is notified that information of the letter A has been input by changing formed image 37 from first image 371 to second image 372, second image 372 may have a shape in which the color of the letter A in first image 371 has changed. Furthermore, second image 372 may have a shape in which the frame in which the letter A is located in first image 371 has become thicker. Furthermore, second image 372 may have a shape in which the letter A and the frame in which the letter A is located in first image 371 have moved toward hologram sheet 40.

[0123] Hologram sheet 40 may further be capable of forming images different from first image 371 and second image 372. In the example shown in FIGS. 23 to 25 , light source 31 includes first light source 311 and second light source 312, as well as third light source 313 and fourth light source 314 located at positions different from first light source 311 and second light source 312. In particular, each light source is located at a position different in direction relative to hologram sheet 40. Hologram sheet 40 also records third and fourth images different from first and second images 371 and 372. Hologram sheet 40 forms the third image using light from third light source 313 and forms the fourth image using light from fourth light source 314. The third and fourth images notify the user that information of the letters B, C, or D has been input, for example, when position detection sensor 21 detects the presence of an object such as a finger.

[0124] The positions of the multiple light sources 31 relative to the hologram sheet 40 are not particularly limited as long as the hologram sheet 40 can form the multiple images 37 recorded thereon by turning the multiple light sources 31 on and off. The multiple light sources 31 may be arranged to surround the hologram sheet 40 when the aerial input display device 10 is observed from a direction perpendicular to the display surface 12, as shown in FIG. 25 . When the aerial input device 20 has four light sources 31 as shown in FIG. 25 , the four light sources 31 may be arranged at 90° intervals around a single point on the hologram sheet 40 (for example, the center of gravity of the hologram sheet 40). Furthermore, when the aerial input device 20 has eight light sources 31, the eight light sources 31 may be arranged at 45° intervals around a single point on the hologram sheet 40 (for example, the center of gravity of the hologram sheet 40).

[0125] As an example, hologram sheet 40 can record multiple images 37 by having multiple hologram layers 45 on which different images 37 are recorded. For example, hologram sheet 40 can record first image 371 and second image 372 by having a first hologram layer on which first image 371 is recorded and a second hologram layer on which second image 372 is recorded. Hologram sheet 40 may also record multiple images 37 by multiplex recording. From the viewpoint of ensuring the amount of light of formed image 37, it is preferable that hologram sheet 40 record multiple images 37 by having multiple hologram layers on which different images 37 are recorded.

[0126] It should be noted that the method of using the aerial input display device 10, which changes the image 37 formed in accordance with the object detection result by the position detection sensor 21, is not limited to notifying the user of the input result of information such as input characters, as described above. For example, when the first image 371 is formed and information input by the user is read from the object detection result by the position detection sensor 21, an input display different from the first image 371 may be formed as the second image 372.

[0127] As described above, the air input device 20 according to the first to fifth embodiments includes the light source 31, the hologram sheet 40 that forms the image 37 recorded by the light from the light source 31 at the imaging position 38, and the position detection sensor 21 that is sensitive at a position corresponding to the imaging position 38, and the position 21s at which the position detection sensor 21 is sensitive is spaced apart from the hologram sheet 40. With this air input device 20, the light source 31 and the hologram sheet 40 can be easily installed in an existing display device 11. Furthermore, by observing the image 37 formed at the imaging position 38, the position 21s at which the position detection sensor 21 is sensitive can be recognized. Therefore, the air input device 20 that allows the user to recognize positions that can be detected by the non-contact position detection sensor 21 can be easily installed in an existing display device 11.

[0128] It should be noted that various modifications can be made to the first to fifth embodiments described above.

[0129] For example, the components of the air input device 20 according to the first to fifth embodiments may be combined as appropriate. As a specific example, in the air input device 20 according to the first embodiment, the image 37 formed at the imaging position 38 by the hologram sheet 40 may include a plurality of regularly arranged dots, a plurality of rectangular frames, and characters arranged within each frame.

[0130] The aerial input display device 10 and the aerial input display device 20 may be installed in an automated teller machine (ATM), a ticket vending machine, an ordering machine, a vending machine, an image or photo printer, an amusement machine installed in a game center, or the like. Alternatively, they may be installed in a mobile object such as an automobile. They may also be installed in a numeric keypad used for entering a PIN code for a credit card, or in a numeric keypad for a lock that is unlocked by entering a personal identification number in a hotel or residence. The aerial input device 20 and the aerial input display device 10 equipped with the hologram sheet 40 can prevent the image 37 from being viewed by persons other than the user by controlling the viewing angle of the image 37 formed by the hologram sheet 40. Furthermore, with a conventional numeric keypad, there is a concern that information entered by a user may be revealed to persons other than the user by checking the user's fingerprint. In contrast, the aerial input device 20 and the aerial input display device 10 equipped with the hologram sheet 40 can prevent information entered by a user from being revealed to persons other than the user by checking the user's fingerprint. As described above, information entered by a user can also be prevented from being revealed to persons other than the user.

[0131] (Variation 1) The aerial input display device 10 and the aerial input device 20 will be further described as Variation 1 from the viewpoint of the relationship with the object on which the aerial input display device 10 and the aerial input device 20 are provided. Fig. 26 is a diagram showing a side view of a display device 11 installed so that the display surface 12 is non-parallel to a horizontal plane G, and an aerial input device 20 installed on the display surface 12 of the display device 11. In other words, Fig. 26 is a diagram showing a side view of an aerial input display device 10 including a display device 11 installed so that the display surface 12 is non-parallel to the horizontal plane G. In the example shown in Fig. 26, the display surface 12 is perpendicular to the horizontal plane G.

[0132] Examples of the case where display device 11 is installed so that display surface 12 is not parallel to horizontal plane G include the case where display device 11 is installed in an automated teller machine (ATM), a ticket vending machine, an ordering machine, a vending machine, an image or photo printer, an amusement cabinet installed in a game center, etc. Another example is the case where display device 11 is installed in a numeric keypad of a type that is installed on the wall or door of a building and that can be unlocked by entering a PIN number.

[0133] FIG. 27 is a diagram showing the aerial input display device 10 shown in FIG. 26 as viewed from above. The light source 31 and the position detection sensor 21 are omitted from FIG. 27 . The direction DB parallel to the display surface 12 and extending from the upper end to the lower end of the display surface 12 is referred to as the up-down direction DB of the display device 11, or simply as the up-down direction DB. The direction DC parallel to the display surface 12 and extending from one lateral end of the display surface 12 to the other is referred to as the left-right direction DC of the display device 11, or simply as the left-right direction DC. The angle θ1 shown in FIG. 26 represents the viewing angle of the image 37 in the up-down direction DB. The viewing angle θ1 of the image 37 in the up-down direction DB is an angle based on a plane SA perpendicular to the up-down direction DB. The angle θ2 shown in FIG. 27 represents the viewing angle of the image 37 in the left-right direction DC. The viewing angle θ2 of the image 37 in the left-right direction DC is an angle based on a plane SB perpendicular to the left-right direction DC. 26 and 27, the viewing angle θ2 in the horizontal direction DC is preferably small from the viewpoint of preventing peeping. On the other hand, since the angle θ3 of the line of sight L6 of the user U with respect to the display surface 12 changes depending on the height of the user U, it is preferable that the viewing angle θ1 in the vertical direction DB be larger than a certain value in order to make it easier for the user U to view the image 37 regardless of the height of the user U. As an example, it is preferable that the viewing angle θ1 in the vertical direction DB be larger than the viewing angle θ2 in the horizontal direction DC.

[0134] From the above perspective, the aerial input device 20 and the aerial input display device 10 equipped with the hologram sheet 40 can adjust the viewing angle θ1 in the up-down direction DB and the viewing angle θ2 in the left-right direction DC. In the aerial input device 20 provided on the display surface 12 of the display device 11 installed so that the display surface 12 is not parallel to the horizontal plane G, the viewing angle θ1 in the up-down direction DB is, for example, 20° or less. The viewing angle θ2 in the left-right direction DC is, for example, 10° or less.

[0135] (Variation 2) The aerial input display device 10 and the aerial input device 20 can also be applied to a display device 11 provided in the cabin of the automobile 90. In particular, the aerial input display device 10 and the aerial input device 20 can be applied to a display device 11 provided in the cabin of the automobile 90, in front of the automobile 90 and below the front window 91 of the automobile 90, and visible to the driver D or the like. Examples of such a display device 11 include a navigation device and a meter display device of the automobile 90.

[0136] Fig. 28 is a diagram showing the aerial input display device 10 and the aerial input device 20 applied to a display device 11 that is installed in the cabin of an automobile 90, in front of the automobile 90 and below the front windshield 91 of the automobile 90, and is visible to the driver D and the person sitting in the passenger seat, as viewed from the side of the automobile 90. Angle θ4a shown in Fig. 28 represents the viewing angle of an image 37 on the upper end side of the display surface 12 in the vertical direction DB (first side SB1 in the vertical direction DB shown in Fig. 28). Angle θ4b shown in Fig. 28 represents the viewing angle of an image 37 on the lower end side of the display surface 12 in the vertical direction DB (second side SB2 in the vertical direction DB shown in Fig. 28).

[0137] In the aerial input display device 10 shown in FIG. 28 , it is conceivable that light from the hologram sheet 40 may be reflected on the front windshield 91 and reach the driver D's eyes E, as indicated by the path of line L1, thereby blocking the driver D's field of vision. From the viewpoint of preventing such a situation, it is preferable that the viewing angle θ4a of the upper end side of the display surface 12 in the vertical direction DB is small. On the other hand, even if the viewing angle θ4b of the lower end side of the display surface 12 in the vertical direction DB is large, there is no concern that the driver D's field of vision will be blocked. From the viewpoint of making it easier for the driver D to view the image 37 regardless of the driver D's posture or height, it is preferable that the viewing angle θ4b of the lower end side of the display surface 12 in the vertical direction DB is large. As an example, it is preferable that the viewing angle θ4b of the lower end side of the display surface 12 in the vertical direction DB is larger than the viewing angle θ4a of the upper end side of the display surface 12 in the vertical direction DB.

[0138] When the air input device 20 and the air input display device 10 equipped with the hologram sheet 40 are applied to a display device 11 of an automobile 90 as shown in FIG. 28 , the viewing angle θ4a of the upper end of the display surface 12 in the vertical direction DB and the viewing angle θ4b of the lower end of the display surface 12 in the vertical direction DB can be adjusted from the above viewpoint. The viewing angle θ4a of the upper end of the display surface 12 in the vertical direction DB and the viewing angle θ4b of the lower end of the display surface 12 in the vertical direction DB can be determined according to the inclination of the display surface 12 with respect to the horizontal plane. As an example, the viewing angle θ4a of the upper end of the display surface 12 in the vertical direction DB is 10° or less. The viewing angle θ4b of the lower end of the display surface 12 in the vertical direction DB is 20° or less.

[0139] 28, it is conceivable that light from the light source 31 reflected on the display surface 12 of the display device 11 will be reflected on the windshield 91 as shown by the path indicated by line L2 and reach the eyes of the driver D, thereby blocking the field of vision of the driver D. It is also conceivable that zero-order light from the hologram sheet 40 will be reflected on the windshield 91 and reach the eyes of the driver D, thereby blocking the field of vision of the driver D. It is preferable that the light source 31 be disposed in a position where such a situation is unlikely to occur. As an example, the light source 31 is disposed above the display surface 12.

[0140] FIG. 29 is a top view of the aerial input display device 10 shown in FIG. 28. The light source 31 and the position detection sensor 21 are omitted from FIG. 29. In the example shown in FIG. 29, the display device 11 is located directly in front of the driver D when viewed from above. The angle θ5 shown in FIG. 29 represents the viewing angle of the image 37 in the left-right direction DC. In the aerial input display device 10 shown in FIGS. 28 and 29, the viewing angle θ5 in the left-right direction DC is preferably small from the perspective of preventing peeping. Furthermore, it is considered that the position of the driver D's viewpoint in the left-right direction DC does not change significantly depending on the driver D's posture. Therefore, even if the viewing angle θ5 in the left-right direction DC is small, the ease of visibility from the driver D's viewpoint is unlikely to be impaired. From the above perspectives, it is preferable to make the viewing angle θ5 in the left-right direction DC relatively small. As an example, the viewing angle θ5 in the left-right direction DC is, for example, 10° or less.

[0141] 29, it is conceivable that light from light source 31 reflected by display surface 12 of display device 11 will be reflected by side window 92 of automobile 90 as shown by line L3 and reach eye E of driver D, blocking the field of view of driver D. It is also conceivable that zero-order light from hologram sheet 40 will be reflected by side window 92 and reach eye E of driver D, blocking the field of view of driver D. It is preferable that light source 31 be disposed in a position where such a situation is unlikely to occur.

[0142] (Variation 3) In the second modification, an example has been shown in which the aerial input display device 10 and the aerial input device 20 are applied to a display device 11 that is provided in the cabin of the automobile 90 and is located in front of the driver D when viewed from above. However, the display device 11 to which the aerial input display device 10 and the aerial input device 20 are applied is not limited to being located in front of the driver D when viewed from above. In the example shown in FIG. 30 , the display device 11 is located at the center of the automobile 90 in the left-right direction DC. Therefore, the display device 11 is located on the left side of the driver D in the left-right direction DC. The position of the display device 11 when viewed from the side of the automobile 90 is the same as the position of the display device 11 shown in FIG. 28 . In other words, the display device 11 is provided in front of the driver D and below the driver D's viewpoint.

[0143] Here, imaging position 38 where hologram sheet 40 forms image 37 can be determined taking into consideration the position of the user's viewpoint. In the example shown in FIG. 30 , imaging position 38 can be determined at a position where driver D can easily view image 37, taking into consideration the position of driver D's viewpoint. For example, as shown in FIG. 30 , imaging position 38 can be determined on the driver D side of the center of display surface 12 in the left-right direction DC. Furthermore, if image 37 is flat, imaging position 38 may be determined so that flat image 37 faces a position expected to be the position of driver D's eyes E.

[0144] Furthermore, the shape of image 37 formed by hologram sheet 40 can be determined taking into consideration the position of the user's viewpoint. In particular, the shape of image 37 formed by hologram sheet 40 can be determined taking into consideration how display surface 12 appears from the user's viewpoint. As an example, consider a case where rectangle 6 as shown in FIG. 31 is displayed on display surface 12 of display device 11 shown in FIG. 30, and hologram sheet 40 is used to form an image of a figure that appears to have the same shape as rectangle 6 displayed on display surface 12 from the viewpoint of driver D. Note that, as shown in FIG. 30, image 37 is formed so that the surface of rectangle 6 faces a position assumed to be the position of driver D's eyes E.

[0145] As shown in FIG. 30, the display surface 12 is located diagonally forward and to the left of the driver D's viewpoint. Also, as shown in FIG. 28, the display surface 12 is located below the driver D's viewpoint. In this case, from the driver D's viewpoint, the rectangle 6 displayed on the display surface 12 appears to have the shape shown in FIG. 32. That is, the right side 6a of the rectangle 6 is closer to the driver D's eye than the left side 6b, and therefore, from the driver D's viewpoint, the right side 6a appears longer than the left side 6b. Also, since the display surface 12 is located diagonally forward and below the driver D's viewpoint, the right side 6a appears to be located lower than the left side 6b from the driver D's viewpoint. Therefore, by forming an image 37 having the same shape as the figure shown in FIG. 32, the rectangle 6 displayed on the display surface 12 and the image 37 can be made to appear to have the same shape from the driver D's viewpoint. Also, the position 21s to which the position detection sensor 21 is sensitive can be determined to correspond to the position at which the image 37 is recognized to be formed from the viewpoint of the driver D, who is the user.

[0146] (Variation 4) When it is assumed that the image 37 will be visible from a plurality of different directions, the image 37 may include a portion that is easily visible from one of the plurality of directions and a portion that is easily visible from another of the plurality of directions. For example, as shown in FIG. 33 , the aerial input display device 10 and the aerial input device 20 may be applied to a display device 11 that is installed in the front of an automobile 90 within the cabin of the automobile 90 and is visible to a driver D sitting in the driver's seat S1 and a person P sitting in the passenger seat S2. In this case, the image 37 may include a driver's seat-facing portion 37e that is easily visible from the driver's seat S1 and a passenger seat-facing portion 37d that is easily visible from the passenger seat S2. In this case, the shape of the driver's seat-facing portion 37e of the image 37 and its positional relationship with respect to the viewpoint of the driver D can be the same as those of the image 37 described above in Modifications 2 and 3, as long as there is no contradiction. Furthermore, the shape of the portion 37d of the image 37 facing the passenger seat and its positional relationship with respect to the viewpoint of the person P sitting in the passenger seat S2 can be applied to the shape of the image 37 and its positional relationship with respect to the viewpoint of the driver D described above in variants 2 and 3, as long as there is no contradiction.

[0147] 33 , when image 37 includes a portion 37e toward the driver's seat and a portion 37d toward the passenger's seat, it may be possible to form an image of only portion 37e toward the driver's seat or only portion 37d toward the passenger's seat by the method described above as the fifth embodiment. That is, light source 31 may include a first light source 311 and a second light source 312 located at a different position from first light source 311. Hologram sheet 40 may be capable of forming an image of portion 37e toward the driver's seat using light from first light source 311 and forming an image of portion 37d toward the passenger's seat using light from second light source 312.

[0148] (Variation 5) In the above-described first to fifth embodiments and each modified example, an example has been described in which a sensor having a planar sensitive area is used as the position detection sensor 21. However, examples of the position detection sensor 21 are not limited to this, and a wide variety of sensors that can detect an operation by a user to input information can be used. Also, a combination of multiple sensors can be used.

[0149] For example, the position detection sensor 21 may include a motion sensor. The motion sensor captures an image of the user and analyzes the captured image to detect the user's movements, thereby detecting an operation of the user to input information.

[0150] The effect of using a motion sensor as the position detection sensor 21 will be described. When a sensor having a planar sensitive area is used as the position detection sensor 21, the position detection sensor 21 needs to be disposed to the side of the imaging position 38, as shown in FIG. 9 . This increases the dimensions of the aerial input device 20 in the direction parallel to the display surface 12. In contrast, when a motion sensor is used as the position detection sensor 21, the position at which the position detection sensor 21 is disposed is not particularly limited as long as it is a position at which an image of the user's operation to input information can be captured. This allows the position of the position detection sensor 21 to be determined depending on the environment in which the aerial input device 20 is installed. Furthermore, since it is not necessarily required to dispose the position detection sensor 21 to the side of the imaging position 38, the dimensions of the aerial input device 20 in the direction parallel to the display surface 12 can be reduced.

[0151] Furthermore, the motion sensor can detect operations for inputting information not only with a finger but also with an input pen, a prosthetic hand, or the like.

[0152] Furthermore, compared to using a sensor with a planar sensitive area as the position detection sensor 21, the motion sensor can detect an operation of inputting information by a user not only in a planar area but also in three-dimensional space. Therefore, the motion sensor can reduce false detections by taking into account information in three-dimensional space.

[0153] Using a motion sensor as the position detection sensor 21 is considered to be particularly effective in the following cases. There are cases where it is necessary to increase the distance between the imaging position 38 of the image 37 and the hologram sheet 40, i.e., the distance D1 shown in FIG. 9 . For example, if a user wants to be able to place a finger or the like at the imaging position 38 without extending their hand close to the display surface 12, the distance D1 needs to be increased. Furthermore, the imaging position 38 perceived by the user changes depending on the position of the user's viewpoint. Increasing the distance D1 increases the change in the imaging position 38 perceived by the user in response to changes in the user's viewpoint. In this case, the position of a finger or the like when the user places a finger or the like at the imaging position 38 with the intention of inputting information also changes significantly depending on the user's viewpoint. Using a motion sensor as the position detection sensor 21 allows for consideration of information in three-dimensional space, thereby reducing false detections even when the position where the user places a finger or the like changes depending on the user's viewpoint, as described above.

[0154] Furthermore, the motion sensor can accurately detect various operations that a user performs on the image 37 with the intention of inputting information. For example, it is conceivable that the operations that a user performs on the image 37 with the intention of inputting information can include, in addition to an operation of pointing at a part of the image 37 with a finger or the like, various operations such as swiping, pinching in, pinching out, pulling the image 37, and rotating the image 37. In such cases, by using a motion sensor as the position detection sensor 21, the user's operations can be accurately detected taking into account information about the three-dimensional space.

[0155] An example of using a motion sensor as the position detection sensor 21 will be described below. FIG. 34 shows an exploded perspective view of the aerial input display device 10 using a motion sensor as the position detection sensor 21. In the example shown in FIG. 34, image 37 indicates a dial-type input switch. In this case, a user rotates the input switch indicated by image 37 at the position where image 37 is formed. Because the position detection sensor 21 is a motion sensor, the position detection sensor 21 can be used to detect the user's operation of rotating the input switch. Therefore, the user can input information to the aerial input display device 10 by rotating the input switch.

[0156] Furthermore, by using a motion sensor as the position detection sensor 21 and grasping the user's viewpoint by eye tracking, false detections can be further reduced. In this case, the aerial input device 20 may further include an eye tracking execution means. In particular, when the distance D1 shown in FIG. 9 is increased, false detections can be further reduced by combining a motion sensor and eye tracking. When eye tracking is performed, the light source 31 can be turned on / off or the image 37 formed by the hologram sheet 40 can be changed depending on the results of the eye tracking. For example, if the eye tracking results indicate that the user is not looking at the display surface 12, the light source 31 can be turned off, and if the eye tracking results indicate that the user is looking at the display surface 12, the light source 31 can be turned on. Furthermore, as described above in the fifth embodiment, if the hologram sheet 40 can form multiple different images 37, the following can also be done. First, the position of the user's viewpoint is grasped by eye tracking. Then, from among the images 37 that the hologram sheet 40 can form, an image 37 that is easily visible from the grasped viewpoint position is selected and formed.

[0157] (Variation 6) The air input device 20 may further include a decorative sheet 60 overlaid on the hologram sheet 40. FIG. 35 is a diagram illustrating the decorative sheet 60, the display device 11, and the hologram sheet 40 of the air input device 20 including the decorative sheet 60. In the example illustrated in FIG. 35 , the surface layer 47, the bonding layer 43, and the adhesive layer 49 of the hologram sheet 40 are not illustrated, and only the hologram layer 45 and the base material layer 41 are illustrated. The decorative sheet 60 has a design displayed by a decorative member 70. The decorative sheet 60 is sheet-shaped. The decorative sheet 60 is overlaid on the sheet-shaped hologram sheet 40 in the vertical direction DA perpendicular to the display surface 12. In the example illustrated in FIG. 35 , the decorative sheet 60 is located between the hologram sheet 40 and the display device 11. The decorative sheet 60 may be attached to the display device 11 via an adhesive layer or the like. Alternatively, the hologram sheet 40 may be attached to the decorative sheet 60 via an adhesive layer or the like. For example, the hologram sheet 40 may be attached to the decorative sheet 60 by an adhesive layer 49 shown in Fig. 7. The hologram sheet 40 and the decorative sheet 60 are collectively referred to as a decorative member 70.

[0158] The visible light transmittance of the decorative member 70 may be 50% or less, 45% or less, or 40% or less. By setting an upper limit on the total light transmittance of the decorative member 70, it is possible to express a wide range of designs with the decorative member 70, and particularly to display designs in deep black. In the illustrated example, the display device 11 can be concealed by the decorative member 70.

[0159] The decorative member 70 used in combination with the display device 11 transmits image light emitted from the display surface 12. A user can view an image displayed on the display surface 12 through the decorative member 70. The visible light transmittance of the decorative member 70 may be 10% or more, 15% or more, or 20% or more. By setting a lower limit for the visible light transmittance of the decorative member 70, sufficient visibility of the image displayed by the display device 11 can be ensured. The range of the visible light transmittance of the decorative member 70 can be set by arbitrarily combining any upper limit value of the visible light transmittance with any lower limit value of the visible light transmittance.

[0160] As used herein, the terms "transparent" and "visible light transmissive" mean that the visible light transmittance is 50% or more, and preferably 80% or more.

[0161] 35 to 37, the decorative sheet 60 has a decorative layer 64 that displays a design. The design expressed by the decorative member 70 is formed in the decorative layer 64. The decorative sheet 60 is overlaid on the display device 11 so that the decorative layer 64 covers the display surface 12 when observed from the vertical direction DA. When the display device 11 is in a non-display state, the decorative sheet 60 conceals the display device 11 and displays the design.

[0162] The decorative layer 64 may be provided with a design such as a figure, pattern, design, color, picture, photograph, character, mark, pictogram, letter, or number. The decorative layer 64 may also have a design expression that displays a background. For example, the decorative layer 64 may display 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 grain pattern, a geometric pattern, or the like, as a design that can harmonize the decorative sheet with the surrounding environment in which the aerial input device 20 is installed. The decorative layer 64 may be formed by printing. The decorative layer 64 may also be formed by transfer printing.

[0163] As shown in Figures 35 and 36, the decorative sheet 60 may further include a substrate 62 laminated with the decorative layer 64. The substrate 62 supports the decorative layer 64. The substrate 62 is in a sheet form. A resin film can be used as the substrate 62. Examples of materials for the substrate 62 include acrylic resins such as polymethyl methacrylate, polyethylene terephthalate, vinyl chloride, ABS (acrylonitrile butadiene styrene copolymer), polycarbonate, polyethylene naphthalate, polystyrene, and cyclic polyolefin. The thickness of the substrate 62 in the vertical direction DA may be 20 µm or more and 250 µm or less.

[0164] The decorative sheet 60 may further include a functional layer (not shown) that covers the decorative layer 64. The functional layer can be expected to have various functions. Examples of the various functions include a hard coat function, an anti-reflection function, an anti-glare function, an anti-static function, and an anti-fouling function. The functional layer may be the outermost layer of the decorative sheet 60. The outermost functional layer may be a hard coat layer that has scratch resistance, etc.

[0165] Fig. 35 shows an example of a decorative sheet 60. The decorative sheet 60 shown in Fig. 35 has a base material 62 and a decorative layer 64. The decorative layer 64 includes a first design layer 67A and a second design layer 67B. The second design layer 67B is located between the first design layer 67A and a user who observes the decorative member 70.

[0166] The first design layer 67A may be a dark color such as black or dark brown. * a * b * L in color space * The value of L is 30 or less. * The color of the first design layer 67A may be adjusted so that the value of L is 10 or less. * a * b * a in color system * The color of the first design layer 67A may be adjusted so that the value of L is between −1 and 1. * a * b * b in color space * The color of the first design layer 67A may be adjusted so that the value of is between −1 and 1.

[0167] L of the design displayed by the decorative sheet 60 * a * b * L in color space * The value of a * The value of b *The value of L is determined as follows. First, an evaluation sample is prepared by attaching a black sheet to the surface of the decorative sheet 60 opposite to the surface facing the user 100 in the vertical direction DA. Light is irradiated onto the evaluation sample from the surface facing the user in the vertical direction DA, and the reflected light from the evaluation sample is measured to determine the L value. * The value of a * The value of b * Identify the value of L * The value of a * The value of b * A spectrophotometer (Konica Minolta "CM-700d") is used to determine the value of L. * The value of a * The value of b * The black sheet was measured using a spectrophotometer (Konica Minolta "CM-700d") in the same way as the evaluation sample. * a * b * Lightness L in the color system * Use a value of 30.

[0168] The first design layer 67A contains a color material. Various color materials, such as pigments and dyes, may be used as the color material. The first design layer 67A may contain cyan, magenta, and yellow pigments to display a black design. The first design layer 67A may contain a carbon block, which is a black pigment, and a cyan pigment to display a black design.

[0169] Examples of the base material in which the colorant of the first design layer 67A is dispersed include acrylic resins such as polymethyl methacrylate, polyurethane resins, vinyl chloride-vinyl acetate copolymers, vinyl chloride-vinyl acetate-acrylic copolymers, chlorinated polypropylene resins, polyester resins, polyamide resins, butyral resins, polystyrene resins, nitrocellulose resins, and cellulose acetate resins. These materials may be used alone or in combination. The first design layer 67A may be formed by printing a resin composition containing the base material and the colorant. The thickness of the first design layer 67A along the vertical direction DA may be 1 μm or more and 10 μm or less.

[0170] The first design layer 67A, which is made as a print layer, may have a design expression that displays a background. For example, designs that can harmonize the decorative sheet 60 with the surrounding environment in which the aerial input device 20 is installed are as described above. As an example, the first design layer 67A may express a wood-grain or stone-grain pattern, texture, or geometric design using a black shading pattern or the like.

[0171] The first design layer 67A may function as a base material. The first design layer 67A may be composed of a resin sheet with a coloring material kneaded into it. In this example, the base material 62 may be omitted from the decorative sheet 60. In this example, the thickness of the first design layer 67A in the vertical direction DA may be 20 μm or more and 250 μm or less.

[0172] The second design layer 67B is disposed on the observer side of the first design layer 67A, i.e., on the user side of the air input device 20. As described above, the first design layer 67A can express colors such as black. The second design layer 67B, used in combination with the first design layer 67A, can display figures, patterns, designs, pictures, characters, marks, pictograms, letters, numbers, and other images. Like the first design layer 67A, the second design layer 67B includes a base material and a colorant. Various pigments and dyes may be used as the colorant. The second design layer 67B can be formed on the first design layer 67A by transfer, printing, or the like. The thickness of the first design layer 67A along the vertical direction DA may be 0.5 μm or more and 10 μm or less. The second design layer 67B may be omitted from the decorative sheet 60.

[0173] 36 and 37 disclose another example of the decorative sheet 60. The decorative sheet 60 shown in Fig. 36 and 37 has a base material 62 and a decorative layer 64. The decorative layer 64 includes a design layer 67 and a light-shielding layer 69. The design layer 67 may be configured in the same manner as the first design layer 67A and the second design layer 67B described above.

[0174] The light-shielding layer 69 is disposed on the rear side of the design layer 67. The rear side refers to the side opposite to the user of the air input device 20, who is the observer, in the vertical direction DA. The light-shielding layer 69 covers the design layer 67 from the display device 11 side. The light-shielding layer 69 may have a light-absorbing function to prevent image light from the display device 11 from entering the design layer 67. The light-shielding layer 69 may include a base material and light-absorbing particles. Examples of light-absorbing particles include black pigments such as carbon black and titanium black.

[0175] Examples of the base material of the light-shielding layer 69 include acrylic resins such as polymethyl methacrylate, polyurethane resins, vinyl chloride-vinyl acetate copolymers, vinyl chloride-vinyl acetate-acrylic copolymers, chlorinated polypropylene resins, polyester resins, polyamide resins, butyral resins, polystyrene resins, nitrocellulose resins, and cellulose acetate resins. These materials may be used alone or in combination of two or more. The thickness of the light-shielding layer 69 is, for example, 1 μm or more and 20 μm or less.

[0176] In the examples shown in Figures 36 and 37, openings 65 are formed in the decorative layer 64. Image light from the display device 11 passes through the openings 65 and is transmitted through the decorative sheet 60. The image light can be absorbed when it enters the light-shielding layer 69. This can suppress color changes in the image displayed by the display device 11. In addition, the design formed by the design layer 67 can be displayed thickly and clearly.

[0177] 36 and 37, the decorative layer 64 includes a decorative portion 64A that forms a design and a transmissive portion 64B that is a non-forming portion of the decorative portion 64A. The decorative portion 64A is formed by an area of ​​the decorative layer 64 where no openings 65 are provided. The transmissive portion 64B is formed by an area of ​​the decorative layer 64 where the openings 65 are provided. The decorative portion 64A is a portion where the decorative layer 64 is formed. The transmissive portion 64B is a portion of the decorative sheet 60 through which image light from the display device 11 passes. The transmissive portion 64B is transmissive to visible light.

[0178] FIG. 37 is a partial plan view showing the decorative sheet 60 of FIG. 36. As shown in FIG. 37, the decorative sheet 60 in plan view can be divided into a decorative portion 64A and a transmissive portion 64B. In the illustrated example, the position, shape, and area of ​​the opening 65 determine the position, shape, and area of ​​the transmissive portion 64B, respectively. The shape of the opening 65 in plan view is not particularly limited. Examples of the shape of the opening 65 in plan view include a shape with a curved outline, such as a circle or ellipse, a polygonal shape, such as a triangle, a rectangle, a pentagon, a hexagon, or an octagon, and a polygonal shape with chamfered corners. However, to ensure isotropy of the optical properties, the shape of the hole in plan view is preferably circular. In the example shown in FIG. 37, the shape of the opening 65 in plan view is circular.

[0179] The ratio of the area occupied by the openings 65 to the area of ​​the decorative layer 64 in a planar view is defined as the aperture ratio of the decorative layer 64. The area of ​​each opening 65 is the area of ​​the portion penetrating the decorative layer 64 when projected in the vertical direction DA. That is, the area of ​​each opening 65 is the area of ​​the region penetrating the decorative layer 64 over the entire thickness in the vertical direction DA, where light traveling in the vertical direction DA can pass through the decorative layer 64 without entering the decorative portion 64A. The upper limit of the aperture ratio of the decorative layer 64 is preferably determined so that the design of the decorative layer 64 can be observed clearly enough when the display device 11 is not displaying an image. The aperture ratio of the decorative layer 64 may be 50% or less, 40% or less, or 30% or less. The lower limit of the aperture ratio of the decorative layer 64 is preferably determined so that the image can be observed clearly enough when the display device 11 is displaying an image. The aperture ratio of the decorative layer 64 may be preferably 3% or more, 5% or more, or 10% or more. The range of the aperture ratio of the decorative layer 64 can be set by arbitrarily combining any upper limit value of the aperture ratio with any lower limit value of the aperture ratio.

[0180] The openings 65 of the decorative sheet 60 shown in FIGS. 36 and 37 can be formed by irradiation with laser light or patterning using photolithography technology.

[0181] The effects of the air input device 20 equipped with the decorative sheet 60 will be described. When no input is being performed by the user, the display device 11 can be in a non-display state in which no image is displayed. At this time, as shown in FIG. 1 , the design of the decorative sheet 60 is observed on the decorative member 70 of the air input device 20 through the transparent hologram sheet 40. In the illustrated example, the user observes the design displayed by the decorative layer 64 of the decorative sheet 60. The decorative sheet 60 can form an excellent design through the rich expressive power of printing, etc. The design expression of the decorative sheet 60 ensures harmony and unity with the surrounding environment, and further imparts excellent design to the environment in which the decorative member 70 is installed. In addition, the display device 11 is concealed by the decorative sheet 60. In other words, the decorative member 70 allows the display device 11 to be installed while ensuring harmony and unity with the surrounding environment. The range of applications of the air input device 20 has expanded rapidly in recent years, and by using the decorative member 70, the air input device 20 can be applied to automobile interiors, building interiors, furniture, home appliances, and the like, where design is important.

[0182] (Variation 7) In the illustrated example, a point light source is used as the light source 31. However, the light source 31 is not limited to this example. As shown in FIG. 38, a surface light source device 32 having a planar light-emitting surface 31c may be used as the light source 31. The surface light source device 32 mainly includes a light guide plate 31a and a light emitter 31b. Light emitted from the light emitter 31b enters the light guide plate 31a. The light travels through the light guide plate 31a while gradually emitting from the light guide plate 31a. The light emitted from the light guide plate 31a may be focused using an optical member or the like. This allows a clearly observable image 37 to be generated. In the air input device 20 shown in FIG. 38, the display device 11, the hologram sheet 40, and the surface light source device 32 are stacked in this order in the vertical direction DA. The aerial input device 20 shown in FIG. 38 is particularly effective when the space for arranging a point light source as the light source 31 is limited, such as when the aerial input device 20 is installed inside the cabin of an automobile 90.

[0183] (Variation 8) As shown in FIGS. 39 and 40 , the air input device 20 may further include a light control sheet 81 that controls the direction of light travel. The light control sheet 81 controls the direction of light travel by transmitting only light traveling within a narrow angular range centered on a predetermined direction. The light control sheet 81 is sheet-shaped. As an example, the light control sheet 81 has a number of light-shielding sections arranged in a direction along the sheet surface. The cross-sectional shape of the light-shielding sections has a high aspect ratio. In this case, light other than light passing between the light-shielding sections is blocked by the light-shielding sections, so that only light traveling within a narrow angular range is transmitted through the light control sheet 81. In the air input device 20 shown in FIG. 39 , the display device 11, the hologram sheet 40, and the light control sheet 81 are stacked in this order in the vertical direction DA. In the air input device 20 shown in FIG. 40 , the display device 11, the light control sheet 81, and the hologram sheet 40 are stacked in this order in the vertical direction DA.

[0184] By providing the air input device 20 with the light control sheet 81, it is possible to prevent light from the light source 31 or external light from being reflected on the display surface 12 of the display device 11 and reaching the user's eyes, making it difficult to see the image 37 or the display surface 12. In addition, by narrowing the emission angle range of the light emitted from the display surface 12 of the display device 11, it is possible to obtain the effect of preventing peeping at the display surface 12.

[0185] (Variation 9) As shown in FIGS. 41 and 42 , the air input device 20 may further include an antireflection layer 82 that prevents light from the light source 31 and external light from being reflected on the display surface 12 of the display device 11 or the surface of the hologram sheet 40. The antireflection layer 82 shown in FIG. 41 is provided on the surface 40 a of the hologram sheet 40 that faces the display surface 12. The antireflection layer 82 shown in FIG. 41 prevents light from the light source 31 and external light from being reflected on the surface 40 a of the hologram sheet 40. The antireflection layer 82 shown in FIG. 42 is provided on the display surface 12 of the display device 11. The antireflection layer 82 shown in FIG. 42 prevents light from the light source 31 and external light from being reflected on the display surface 12. The antireflection layer 82 can prevent light from the light source 31 and external light from being reflected on the display surface 12 of the display device 11 or the surface of the hologram sheet 40 and reaching the user's eyes, making it difficult to view the image 37 or the display surface 12. The anti-reflection layer 82 shown in FIGS. 41 and 42 is provided particularly when a gap is provided between the hologram sheet 40 and the display device 11.

[0186] (Variation 10) A colored substrate may be used as substrate layer 41 of hologram sheet 40 shown in FIG. 7 . Using a colored substrate as substrate layer 41 allows the visible light transmittance of substrate layer 41 to be kept low. In this case, light emitted by display device 11 reaches the user's eyes after passing through substrate layer 41 once. On the other hand, when light from light source 31 or external light is reflected on display surface 12 of display device 11 and reaches the user's eyes, the light must pass through substrate layer 41 twice. Therefore, by using a substrate with a low visible light transmittance as substrate layer 41, the light emitted by display device 11 can reach the user's eyes while effectively reducing the amount of light reflected on display surface 12 of display device 11.

[0187] (Variation 11) A typical display device 11 may have a frame 83 on its display surface 12 that covers the periphery of the display surface 12 and a cover panel 84 that covers the display surface 12 and the frame 83 to protect the display surface 12. The frame 83 is, for example, a bezel that protects the periphery of the display surface 12. The cover panel 84 is a plate-shaped member made of, for example, resin or glass. An example of a display device 11 having the frame 83 and cover panel 84 on its display surface 12 is a navigation device for an automobile 90. When the frame 83 and cover panel 84 are provided on the display surface 12, the hologram sheet 40 can be disposed between the display surface 12 and the frame 83 as shown in FIG. 43. The hologram sheet 40 may also be disposed between the cover panel 84 and the frame 83 as shown in FIG. 44.

[0188] (Variation 12) The hologram sheet 40 used in the air input device 20 may be provided with an alignment mark 85. As an example, as shown in FIG. 45 , a hologram sheet 40 provided in one of the air input devices 20 and a hologram sheet 40 provided in another of the air input devices 20 are formed in a continuous state. The multiple hologram sheets 40 formed in a continuous state are separated from each other and then incorporated into the air input device 20. A dashed dotted line L5 shown in FIG. 45 indicates the position where the hologram sheet 40 is separated. In the example shown in FIG. 45 , the hologram sheet 40 provided in one of the air input devices 20 has a rectangular shape. In the example shown in FIG. 45 , an alignment mark 85 is provided at a corner of the rectangular hologram sheet 40. The alignment mark 85 is a cross-shaped symbol. The alignment mark 85 can be used as a guide for determining the cutting position when separating the multiple hologram sheets 40 from each other or for aligning the hologram sheet 40 when incorporating it into the air input device 20.

[0189] (Variation 13) In each of the above-described embodiments, the light source 31 is a point light source. Therefore, the light emitted by the light source 31 is circular. In other words, the light emitted by the light source 31 does not have a pattern. However, the light source 31 may emit light having any pattern. For example, the light source 31 may emit light having a pattern that resembles a star shape such as a six-pointed star or the shape of a vehicle such as an airplane. FIG. 46 shows an example of a light source 31 that emits light having a six-pointed star pattern. In the example shown in FIG. 46, the light source 31 has a patterned portion 31x provided on the side from which the light is emitted. The patterned portion 31x has a transmissive portion 31y having a shape corresponding to the pattern of the light emitted from the light source 31. A portion of the light emitted from the light source 31 is blocked by portions of the patterned portion 31x other than the transmissive portion 31y, and another portion is transmitted through the transmissive portion 31y. As a result, the light source 31 emits light having a light-dark pattern. The light source 31 is not limited to the illustrated example, and may be a dot matrix display in which a plurality of pixels are regularly arranged two-dimensionally, and a pattern may be formed by the brightness of each pixel. An example of a dot matrix display is a display in which each pixel uses an LED.

[0190] When light emitted by such a light source 31 is irradiated onto a hologram sheet 40 on which an image 37 including a plurality of points (dots) as shown in FIGS. 3 and 5 is recorded, the hologram sheet 40 forms an image 37 having a shape corresponding to the pattern of the light emitted by the light source 31 at an imaging position 38 where points are imaged. When the light source 31 emits light having a hexagram star pattern as in the example shown in FIG. 46, the hologram sheet 40 forms an image 37 having a hexagram star shape at the imaging position 38 as shown in FIG. 47. In this way, by emitting light having a pattern and the image 37 at the imaging position 38 including dots, the image 37 can be formed having a pattern corresponding to the pattern of the light emitted by the light source 31, rather than a dot. This allows the image 37 to have a design feature. A sufficiently large distance between the imaging position 38 and the hologram sheet 40 allows a user to easily visually recognize the pattern of the image 37. In particular, it is preferable that the distance between the imaging position 38 and the hologram sheet 40 is 10 mm or more, and more preferably 20 mm or more.

[0191] Light source 31 may emit light while moving the pattern. For example, if light source 31 includes patterned portion 31x, the pattern contained in the emitted light can be moved by moving patterned portion 31x. Alternatively, if light source 31 is a dot matrix display, the pattern contained in the emitted light can be moved by appropriately switching the brightness of each pixel. When light source 31 emits light while moving the pattern, the pattern of image 37 formed on hologram sheet 40 illuminated with the light can be moved. As an example, if light source 31 irradiates light onto hologram sheet 40 that forms hexagram-shaped image 37 shown in FIG. 47 while rotating patterned portion 31x, the shape of the hexagram star contained in image 37 also rotates in response to the rotation of patterned portion 31x, as shown by the arrow in FIG. 48. In this way, by light source 31 emitting light while moving the pattern, the design of image 37 can be improved.

[0192] The light source 31 can switch the pattern of the light it emits. For example, if the light source 31 has a patterned portion 31x, the light source 31 can switch the pattern of the light it emits by replacing the patterned portion 31x with another patterned portion. Alternatively, if the light source 31 is a dot matrix display, the pattern of the light it emits can be switched by appropriately switching the brightness of multiple pixels. For example, by switching the pattern of the light emitted by the light source 31 based on information input by a user to the air input device 20, the user can visually recognize that information has been input.

[0193] When hologram sheet 40 forms image 37 having a pattern, it is desirable to make the pattern more easily recognizable to the user. The inventors' research has revealed that when hologram sheet 40 forms image 37 at a position displaced from the intended position, the pattern of image 37 is more easily recognized. The "intended position" refers to the position at which hologram sheet 40 forms an image when hologram sheet 40 is irradiated with light at the wavelength and angle of reference light irradiated onto the hologram sensitive material during manufacturing of hologram sheet 40. Further research by the inventors has revealed that the larger the size X1 [mm] of light source 31 shown in FIG. 46 is, the smaller the distance X2 [mm] between light source 31 and hologram sheet 40 is, and the smaller the diameter X3 [mm] of the dots included in the image recorded on hologram sheet 40 is, the more easily the image is formed at a position displaced from the intended position. After extensive investigation, the inventors of the present invention have found that the pattern of the image 37 is easily recognized when these values ​​satisfy the following relationship: X1 / (X2×X3)≧1 / 75

[0194] X1 / X2 refers to the apparent size of the light source 31 relative to the hologram sheet 40. If the size X1 of the light source 31 is large and / or the distance X2 between the light source 31 and the hologram sheet 40 is small, the apparent size of the light source 31 relative to the hologram sheet 40 is large, and the light irradiated from the light source 31 onto the hologram sheet 40 is likely to spread widely. Light is likely to be irradiated onto the hologram sheet 40 at an angle that is different from the angle at which the reference light is irradiated onto the hologram sensitive material when manufacturing the hologram sheet 40. Irradiating the hologram sheet 40 with light in this manner makes it more likely that the image 37 will be formed at a position different from the intended position on the hologram sheet 40. The size of the light source 31 refers to the maximum length of the light source 31 when observed from the direction in which the light is emitted. For example, if the light source 31 is circular, the size of the light source 31 is the diameter of the circle. The distance between the light source 31 and the hologram sheet 40 refers to the length of the line connecting the center of the light source 31 and the center of gravity of the hologram sheet 40. Specifically, the size X1 of the light source 31 is preferably 20 mm or more, and more preferably 40 mm or more. Specifically, the distance X2 between the light source 31 and the hologram sheet 40 is preferably 300 mm or less, and more preferably 100 mm or less.

[0195] If the diameter of the dots included in the image recorded on the hologram sheet 40 is small relative to the apparent size of the light source 31, the size of the image 37 formed at a position shifted from the intended position will have a large ratio to the dot diameter. This makes it easier for the hologram sheet 40 to form the image 37 at a position shifted from the intended position. The diameter of the dots included in the image recorded on the hologram sheet 40 refers to the diameter of the dots included in the image formed on the hologram sheet 40 when the hologram sheet 40 is irradiated with light at the wavelength and angle of the reference light irradiated onto the hologram sensitive material when manufacturing the hologram sheet 40. In other words, the dot diameter is the diameter of the dots that emit the object light irradiated onto the hologram sensitive material when manufacturing the hologram sheet 40. Specifically, the diameter X3 of the dots included in the image recorded on the hologram sheet 40 is preferably 5 mm or less, more preferably 3 mm or less, and even more preferably 1 mm or less.

[0196] (Variation 14) FIG. 49 shows a perspective view of a light source 31 according to Modification 14. In the example shown in FIG. 49, the light source 31 includes an optical element 35 that controls the direction of light emission. The optical element 35 controls the direction of light emitted from the light source 31 by transmitting only light traveling within a narrow angular range centered on a predetermined direction. The optical element 35 is, for example, a louver film that has a large number of light-shielding portions arranged in a direction along the sheet surface. The light emitted from the light source 31 in a diffused manner is light that is not intended to be observed by the user and impairs the user's field of vision when the user observes such light. By including such an optical element 35 in the light source 31, light that impairs the user's field of vision can be suppressed.

[0197] The above-described embodiments and modifications can be combined as appropriate. [Explanation of symbols]

[0198] 10. Air-to-air input display device 11 Display device 12 Display surface 20. Aerial Input Device 21 Position detection sensor 25 Means of Notification 30 Aerial imaging device 31 Light source 37 statue 38 Imaging position 39 Image plane 40 Hologram Sheet 41 Base material layer 43 Bonding layer 45 hologram layers 47 Surface layer 49 Adhesive layer

Claims

1. A light source and a hologram sheet that forms an image recorded by the light from the light source at an imaging position; a position detection sensor having sensitivity at a position corresponding to the imaging position, a position where the position detection sensor is sensitive is spaced apart from the hologram sheet; the light source is located on the same side as the imaging position with respect to the hologram sheet, the distance between the imaging position and the hologram sheet is 10 mm or more; the light source emits light having a pattern; The image at the imaging position includes a dot.

2. A light source; a hologram sheet that forms an image recorded by the light from the light source at an imaging position; a position detection sensor having sensitivity at a position corresponding to the imaging position; a display device having a display surface for displaying an image, a position where the position detection sensor is sensitive is spaced apart from the hologram sheet; the light source is located on the same side as the imaging position with respect to the hologram sheet, the distance between the imaging position and the hologram sheet is 10 mm or more; An aerial input device, wherein the hologram sheet is provided on the display surface.

3. The air input device according to claim 1 or 2, wherein the light source is a point light source.

4. The air input device according to claim 1 , wherein the light source emits parallel light.

5. The air input device according to claim 1 , wherein the hologram sheet includes a volume hologram.

6. The aerial input device according to claim 1 , wherein the hologram sheet has a visible light transmittance of 50% or more.

7. The aerial input device according to claim 1 , wherein the image indicates a plurality of detection positions that can be distinguishably recognized by the position detection sensor at the imaging position.

8. The air input device according to claim 7 , further comprising a notification unit that provides a notification corresponding to the detected position.

9. the light source includes at least a first light source and a second light source located at a position different from the first light source, 9. The aerial input device according to claim 1, wherein the hologram sheet forms a first image recorded by light from the first light source and forms a second image recorded by light from the second light source.

10. The air input device according to claim 1 , wherein the position detection sensor includes a motion sensor.

11. 11. The aerial input device according to claim 1, wherein the hologram sheet comprises a hologram layer and a surface layer that is laminated on the hologram layer to form a surface of the hologram sheet and protects the hologram layer from the outside.

12. The air input device of claim 1 , wherein the light source emits light while moving the pattern.

13. 13. The aerial input device according to claim 1 or 12, wherein a size X1 [mm] of the light source, a distance X2 [mm] between the light source and the hologram sheet, and a diameter X3 [mm] of a dot included in the image recorded on the hologram sheet satisfy the following relationship: X1 / (X2×X3)≧1 / 75

14. The air input device according to claim 1 , wherein the light source has an optical member that controls the direction in which light is emitted.

15. a display device having a display surface for displaying an image; an aerial input display device comprising: the aerial input device according to claim 2, wherein the hologram sheet is provided on the display surface; the image at the imaging position is made up of any one of a dot, a grid, and a design pattern, or a combination thereof; An aerial input display device, wherein the sum of the areas of the images observed from a direction perpendicular to the display surface is 0.1% or more and 60% or less of the area of ​​the display surface.

Images