JP7216925B2 - Aerial imaging device, aerial input device, display device with aerial imaging device, moving body and hologram imaging lens - Google Patents

Description

The present invention relates to an aerial imaging device, an aerial input device having an aerial imaging device, a display device with an aerial imaging device or an aerial imaging device having an aerial input device, an aerial imaging device, an aerial input device or an aerial imaging device The present invention relates to a mobile body having a display device with the attached display device. The invention also relates to a holographic imaging lens.

2. Description of the Related Art As a device for displaying a display object in the air by forming an image of image light from an image light emitting device that emits image light in the air without using a screen or the like, for example, an aerial imaging device described in Patent Document 1 is known. there is An aerial imaging device described in Patent Document 1 has an imaging element for forming an image in the air with image light from an image light emitting device. In Patent Document 1, the image forming element is formed by arranging the reflecting surfaces of two reflecting members at regular intervals and laminating the respective reflecting members so that the reflecting surfaces are perpendicular to each other.

WO2009/131128

The imaging element described in Patent Document 1 has a complicated configuration in which the reflecting members are arranged accurately. Such imaging elements are not easy to manufacture and are costly. SUMMARY OF THE INVENTION The present invention has been made in consideration of such points, and an object of the present invention is to form an image in the air with a simple structure.

The aerial imaging device of the present invention comprises:
a display device that emits image light;
and a hologram imaging lens that forms an image of the image light emitted from the display device at an imaging position.

In the aerial imaging device of the present invention, the image light may be divergent light.

In the aerial imaging device of the present invention, the hologram imaging lens may be a volume hologram.

In the aerial imaging device of the present invention, the hologram imaging lens may be a reflection hologram.

In the aerial imaging device of the present invention, the hologram imaging lens may image red wavelength light, green wavelength light, and blue wavelength light, respectively.

In the aerial imaging device of the present invention, the display device comprises light of red wavelength, light of green wavelength, and light of blue wavelength so that the image formed by the hologram imaging lens has a desired color. Image light including light may be emitted.

The aerial imaging device of the present invention may further include an optical member including a second reflection hologram between the display device and the hologram imaging lens.

In the aerial imaging device of the present invention, the image light may enter the hologram imaging lens at an incident angle forming Brewster's angle.

In the aerial imaging device of the present invention, the imaging position may be observed from a direction different from a direction in which the image light enters the hologram imaging lens.

In the aerial imaging device of the present invention, the imaging position may be between the display device and the hologram imaging lens.

In the aerial imaging device of the present invention, the distance between the imaging position and the hologram imaging lens may be 15 mm or more.

The aerial imaging device of the present invention may further have an imaging mark indicating the imaging position.

In the aerial imaging device of the present invention, the hologram imaging lens may be transparent.

In the aerial imaging apparatus of the present invention, the hologram imaging lens may include a plurality of element hologram forming portions provided with interference fringes and element hologram non-forming portions between the element hologram forming portions.

The aerial input device of the present invention is
Any aerial imaging device as described above;
and a position detection sensor having sensitivity at a position corresponding to the imaging position.

The aerial input device of the present invention may further include a sensor mark indicating an area detectable by the position detection sensor.

The display device with an aerial imaging device of the present invention includes:
a second display device having a display surface;
Any of the above-described aerial imaging devices or any of the above-described aerial input devices having the hologram imaging lens provided on the display surface.

A moving body of the present invention includes any of the above-described aerial imaging devices, any of the above-described aerial input devices, or the above-described display device with an aerial imaging device.

The hologram imaging lens of the present invention forms an image of incident image light at an imaging position.

According to the present invention, an image can be formed in the air with a simple configuration.

FIG. 1 is a diagram showing a moving body provided with a display device with an aerial imaging device. FIG. 2 is an exploded perspective view schematically showing the configuration of the display device with an aerial imaging device. FIG. 3 is a top view of the airborne input device. FIG. 4 is an enlarged view of a part of the hologram imaging lens. FIG. 5 is a cross-sectional view taken along line VV of FIG. 3 and is a cross-sectional view of the aerial imaging device for explaining the action of the aerial imaging device. FIG. 6 is a diagram showing the relationship between the direction in which the imaging position is observed and the direction in which the image light is incident. FIG. 7 is a diagram showing the manufacturing process of the hologram imaging lens. FIG. 8A is a diagram showing an example of an image forming process by a hologram imaging lens. FIG. 8B is a diagram showing another example of the image forming process by the hologram imaging lens. FIG. 9 is a cross-sectional view showing a modification of the aerial imaging device corresponding to FIG.

An embodiment of the present invention will be described below with reference to the drawings. In the drawings attached to this specification, for the convenience of illustration and ease of understanding, the scale and the ratio of vertical and horizontal dimensions are changed and exaggerated from those of the real thing.

It should be noted that the terms such as "parallel", "perpendicular", "same" and the like, length and angle values, etc. that specify shapes and geometric conditions and their degrees used in this specification are strictly It shall be interpreted to include the extent to which similar functions can be expected without being bound by the meaning.

FIG. 1 is a diagram showing part of the interior of an automobile as an example of a mobile object. As shown in FIG. 1, an automobile 1 has an instrument panel and a center console. In the illustrated example, the center console 5 of the motor vehicle 1 comprises a display device 10 with an aerial imaging device. In particular, the display device 10 with an aerial imaging device is provided in place of the operation switches and the display device with a touch panel function provided on the center console of the conventional automobile.

The display device 10 with an aerial imaging device displays an image and forms an image in the air separately from the image. That is, an observer of the display device 10 with an aerial imaging device can visually recognize an image displayed on the display surface and an image formed at a position spaced apart from the display surface. Moreover, the display device 10 with an aerial imaging device preferably has an aerial input device 20, which will be described later. The aerial input device 20 allows the observer to input information to the display device 10 with an aerial imaging device. Typically, an observer of the display device 10 with the aerial imaging device moves a finger or the like to the position of the image formed in the air, thereby viewing the display device with the aerial imaging device without touching the display surface or the like. 10 can be entered.

FIG. 2 shows an exploded perspective view of the display device 10 with an aerial imaging device. As shown in FIG. 2 , the display device 10 with an aerial imaging device has a second display device 11 and an aerial input device 20 .

The second display device 11 has a display surface 12 . The second display device 11 can display an image on the display surface 12 . The image displayed on the display surface 12 can be observed by an observer of the display device 10 with an aerial imaging device. Any display device such as a liquid crystal display, a plasma display, or an organic EL display can be used as the second display device 11 . The display surface 12 of such a second display device 11 is typically a glass surface.

Alternatively, the second display device 11 displays an image by transmitting light through a printed transparent film or the like, or displays a bright and dark image by blocking part of the light with a light blocking material. may be In this case, the second display device 11 includes a light source that emits light, and a predetermined pattern portion such as a transparent film on which printing corresponding to the image to be displayed is applied, or a light shielding material having a shape corresponding to the image to be displayed. contains. The display surface 12 is the surface of the transparent film or the non-shading portion. 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 uniform the intensity of light that passes through a predetermined pattern portion.

A top view of the airborne input device 20 is shown in FIG. The aerial input device 20 forms images in the air and detects the presence of objects at detectable locations. Location information can be input by detecting the presence of an object. Information on the position to be detected can be made to correspond to the formed image. For example, in the aerial input device 20 shown in FIG. 3, projected shapes in which four characters A, B, C, and D are drawn are imaged in the air, and the presence of an object at a position corresponding to each projected shape can be detected. and In such an aerial input device 20, when an observer points a protruding shape on which a character is drawn with a finger F, the aerial input device 20 detects the pointed position and displays a protruding shape corresponding to the detected position. Identify. Information on the character pointed by the observer can be input by specifying the protruding shape being pointed.

As shown in FIG. 2, the aerial input device 20 is arranged on the display surface 12 side of the second display device 11 . Therefore, the aerial input device 20 can be retrofitted to the second display device 11 . Further, as shown in FIG. 2, the aerial input device 20 has a position detection sensor 21, a sensor mark 25, and an aerial imaging device 30. As shown in FIG.

A position detection sensor 21 detects the position of an object in a predetermined area R. FIG. The position detection sensor 21 may detect not only the position of an object but also its motion. The position detection sensor 21 is set and arranged so as to have detection sensitivity at a position corresponding to a position where an image is formed. In the example shown in FIGS. 2 and 3, the position detection sensor 21 includes a first sensor 21a that detects the position in the first direction d1 and a position in the second direction d2 that is non-parallel to the first direction d1. and a second sensor 21b. The position of the object in the first direction d1 and the second direction d2 can be detected by the first sensor 21a and the second sensor 21b. Further, by detecting the speed of the object in the first direction d1 and the second direction d2, it is possible to detect the movement of the object in the first direction d1 and the second direction d2. Note that the position detection sensor 21 is not limited to the illustrated example, and may be capable of detecting the position of an object only in the first direction d1, or in addition to the first direction d1 and the second direction d2. It may also be possible to detect a position in a third direction that is non-parallel to the direction d1 and the second direction d2.

The sensor mark 25 allows the observer to visually recognize the area where the position detection sensor 21 can detect the position. In the examples shown in FIGS. 2 and 3, the sensor mark 25 surrounds the area R so that the position detection sensor 21 detects the position of the object. In the illustrated example, the sensor mark 25 is a rectangular frame-shaped member, and the position detection sensor 21 is provided on the sensor mark 25 . However, sensor indicia 25 may be of any shape.

The aerial imaging device 30 forms a desired image. The formed image is observed by an observer. The aerial imaging device 30 has a display device 31 that emits image light, and a hologram imaging lens 40 that forms an image of the image light emitted from the display device 31 at an imaging position 45 . The aerial imaging device 30 also has an imaging mark 35 that indicates the imaging position 45 .

The display device 31 emits light, which forms the basis of an image formed by the aerial imaging device 30, to the hologram imaging lens 40 as image light. The image light emitted by the display device 31 is preferably divergent light. Any display device such as a liquid crystal display, a plasma display, an organic EL display, or the like can be used as such a display device 31 . Alternatively, the display device 31 may be a projector or the like that emits parallel light. When the image light emitted by the display device 31 is parallel light, divergent light can be obtained by transmitting the image light while diffusing it on the screen 32 as shown in FIG. 8B described later. If the display device 31 is a projector or the like that emits parallel light, and the screen 32 transmits the image light while diffusing it, it is preferable to provide at least one mirror between the display device 31 and the screen 32 . Since the image light from the display device 31 reaches the screen 32 while being reflected by the mirror, the configuration composed of the display device 31 and the screen 32 can be miniaturized.

The image light emitted by the display device 31 preferably includes red wavelength light, green wavelength light, and blue wavelength light. That is, the display device 31 preferably emits full-color image light. The light of each wavelength contained in the image light emitted by the display device 31 is adjusted in intensity so that the image formed by the hologram imaging lens 40 has a desired color. In other words, the display device 31 emits image light including red wavelength light, green wavelength light, and blue wavelength light so that the image formed by the hologram imaging lens 40 has a desired color. emit. In other words, the display device 31 emits light of each wavelength according to the characteristics of the hologram imaging lens 40 . For example, in the hologram imaging lens 40, light with a red wavelength is less diffracted than light with a blue wavelength. If the ratio of blue wavelength light to red wavelength light is greater than the ratio of light of blue wavelengths to light of red wavelengths, display device 31 will produce more light of red wavelengths than light of blue wavelengths for the desired color that the image is to exhibit. image light is emitted to the hologram imaging lens 40 . Conversely, for example, when the display device 31 emits image light in which red wavelength light is greater than blue wavelength light to the hologram imaging lens 40, the hologram imaging lens 40 emits red wavelength light. It is designed to be less diffracted than blue wavelength light.

The image light emitted by the display device 31 is preferably incident on the hologram imaging lens 40 at an incident angle forming the Brewster's angle. Here, the Brewster angle is an incident angle at which the reflectance of a polarized component (p-polarized component) parallel to the plane of incidence at the interface becomes zero. That is, when the image light enters the hologram imaging lens 40 at an angle forming the Brewster's angle, only one polarization component (s-polarized component) is reflected on the surface of the hologram imaging lens 40 . As a specific example, when the hologram imaging lens 40 is made of general glass, the incident angle that is Brewster's angle is about 56°.

The imaging mark 35 is provided around an imaging position 45 where the hologram imaging lens 40 forms an image, and indicates the imaging position 45 where the hologram imaging lens 40 forms an image. The imaging mark 35 indicates the approximate position of the imaging position 45 to the observer, thereby making it easier for the observer to recognize the image formed at the imaging position 45 . In the example shown in FIGS. 2 and 3, the imaging mark 35 is the same member as the sensor mark 25. In the example shown in FIGS. Therefore, the imaging mark 35 is a rectangular frame-shaped member. However, not limited to the illustrated example, the imaging mark 35 may be a member different from the sensor mark 25 . Also, the imaging mark 35 may have any shape.

The hologram imaging lens 40 functions as an imaging element, and forms an image at an imaging position 45 with image light emitted from the display device 31 . That is, the hologram imaging lens 40 can form an image in the air. The hologram imaging lens 40 realizes the function of a lens that diffracts light to direct incident light to a desired position and form an image at an imaging position. Hologram imaging lens 40 is preferably a volume hologram. In the illustrated example, the hologram imaging lens 40 forms an image on the side on which the image light from the display device 31 is incident. Therefore, the hologram imaging lens 40 forms an image while reflecting the image light. In this example, the hologram imaging lens 40 is a reflection hologram. Further, the hologram imaging lens 40 forms images of red wavelength light, green wavelength light, and blue wavelength light, respectively.

As shown in FIG. 2 , the hologram imaging lens 40 is provided on the display surface 12 of the second display device 11 . The hologram imaging lens 40 is preferably transparent so that the display surface 12 of the second display device 11 can be observed through the hologram imaging lens 40 . The term “transparent” means having transparency to the extent that one side of the hologram imaging lens can be seen through the other side of the hologram imaging lens. , means that it has a visible light transmittance of 30% or more, more preferably 70% or more. The visible light transmittance is the transmittance at each wavelength when measured within the measurement wavelength range of 380 nm to 780 nm using a spectrophotometer ("UV-3100PC" manufactured by Shimadzu Corporation, compliant with JIS K 0115). can be specified as the average value of

FIG. 4 shows an enlarged part of an example of the hologram imaging lens 40 . In the example shown in FIG. 4, the hologram imaging lens 40 includes a plurality of element hologram forming portions 41 provided with interference fringes forming holograms. Moreover, as in the example shown in FIG. 4, the hologram imaging lens 40 preferably includes an element hologram non-forming portion 42 between the element hologram forming portions 41 . No interference fringes are provided in the elemental hologram non-forming portion 42 . In the example shown in FIG. 4, the element hologram forming portions 41 are formed in a square shape, and a plurality of element hologram forming portions 41 are arranged in a square lattice. The light incident on the element hologram formed portion 41 is diffracted, while the light incident on the element hologram non-formed portion 42 is transmitted without being diffracted. However, without being limited to the example shown in FIG. 4, the hologram imaging lens 40 may not include the element hologram non-forming portion 42 and may be provided with interference fringes over the entire surface.

As described above, the hologram imaging lens 40 forms an image on the side on which the image light from the display device 31 is incident. Therefore, an imaging position 45 where the hologram imaging lens 40 forms an image is between the display device 31 and the hologram imaging lens 40 . Also, the distance D between the imaging position 45 and the hologram imaging lens 40 is preferably 15 mm or more, more preferably 30 mm or more.

5 is a cross-sectional view taken along line VV of FIG. 3. FIG. As shown in FIG. 5, the observer observes the image formed on the imaging position 45 from a direction different from the direction in which the image light is projected from the display device 31 and points the image with a finger F. That is, the imaging position 45 where the image is formed is observed from a direction different from the direction in which the image light enters the hologram imaging lens 40 . FIG. 6 shows the relationship between the direction in which an observer observes an image and the direction in which image light is incident. Of the angles formed by the direction in which the imaging position 45 is observed and the direction in which the image light is incident on the hologram imaging lens 40, the smaller angle θ is preferably 90° or more, more preferably 130° or more. is more preferable, and 170° or more is even more preferable.

Next, a method for manufacturing the hologram imaging lens 40 will be described with reference to FIG. FIG. 7 shows a state in which the hologram recording material is irradiated with object light and reference light when recording a hologram.

As shown in FIG. 7, the hologram recording material 40a is irradiated with object light from a position that will be the imaging position 45 of the hologram imaging lens 40 to be manufactured. At the same time, the hologram recording material 40a is irradiated with reference light, which is parallel light, through the condenser lens 50. As shown in FIG. The condensing lens 50 functions to condense the incident parallel light to a position where the hologram imaging lens 40 is irradiated with the diverging image light, ie, the position where the display device 31 is arranged. Interference fringes are recorded in the hologram recording material 40a by being irradiated with the object light and the reference light. Thus, the hologram imaging lens 40 is manufactured.

Materials used for the hologram recording material 40a include, for example, silver salt sensitive materials, gelatin dichromate, crosslinkable polymers, and photopolymers. In particular, photopolymer is preferable as a material for the hologram recording material 40a because of its excellent mass productivity. A photopolymer includes at least one photopolymerizable compound and a photoinitiator. The thickness of the layer containing the photopolymer is, for example, 5 μm or more and 100 μm or less, preferably 10 μm or more and 50 μm or less. The photopolymer is formed on a substrate made of polycarbonate (PC) or polyethylene terephthalate (PET), for example.

Examples of the object light and reference light with which the hologram recording material 40a is irradiated include argon ion lasers (wavelengths of 457.9 nm, 476.5 nm, 488.0 nm and 514.5 nm), krypton ion lasers (wavelength of 647.1 nm), Helium-neon laser (wavelength 632.8 nm) and YAG laser (wavelength 532 nm) are used.

Alternatively, hologram imaging lens 40 may be manufactured by a hologram printer. According to the hologram printer, the hologram imaging lens 40 can be manufactured by calculating the interference fringes at each position of the manufactured hologram imaging lens 40 and then recording the pattern of the interference fringes. In particular, when manufacturing a large-sized hologram imaging lens 40 , the hologram imaging lens 40 can be manufactured without using a large-sized condenser lens 50 .

The hologram imaging lens 40 can be mass-produced by manufacturing one hologram imaging lens 40 by any of the above-described methods or other methods and optically replicating the hologram imaging lens 40. .

Next, the operation of the aerial imaging device 30 and the aerial input device 20 will be described with reference to FIGS. 8A and 8B. 8A and 8B show an example and another example of a state in which an image is reproduced when light is emitted from the display device 31. FIG.

In the example shown in FIG. 8A, the hologram imaging lens 40 is irradiated with image light that is divergent light from the display device 31 . On the other hand, in the example shown in FIG. 8B, the screen 32 is irradiated with parallel image light from the display device 31, and the hologram imaging lens 40 is irradiated with the image light that is diffused by the screen 32 and becomes divergent light. be. The image light applied to the hologram imaging lens 40 is diffracted by the hologram imaging lens 40 . The image light diffracted at each position of the hologram imaging lens 40 is condensed and imaged at the imaging position 45 . Thus, an image is formed in the air by image light from the display device 31 . That is, the image light emitted from the display device 31 becomes the reproduction light for reproducing the hologram.

An imaging mark 35 is provided at an imaging position 45 where an image is formed by the aerial imaging device 30 . The observer can easily observe the formed image by using the imaging mark 35 as a guide.

A position detection sensor 21 having detection sensitivity is arranged at a position corresponding to the imaging position 45 . The position detection sensor 21 detects the position of the finger F by moving an object, for example, the observer's finger F to the imaging position 45 where the position detection sensor 21 is sensitive. With the position detection sensor 21, the aerial input device 20 can specify the position pointed by the finger F in the image formed in the air, and can input the information of the position.

By the way, the conventional image forming element as described in Patent Document 1 has a complicated structure, so it is not easy to manufacture and costs much. For this reason, it is difficult to mass-produce an aerial imaging device having a conventional imaging element, and it is difficult to sufficiently supply it to meet the increasing demand these days.

On the other hand, the aerial imaging device 30 of the present embodiment includes a display device 31 that emits image light, and a hologram imaging lens 40 that forms an image of the image light emitted from the display device 31 at an imaging position 45. ing. That is, a hologram imaging lens 40 is used as an imaging element. The hologram imaging lens 40 has a simple structure in which only interference fringes are recorded. With the hologram imaging lens 40 having such a simple configuration, the aerial imaging device 30 can form an image in the air. The hologram imaging lens 40 can be easily manufactured by recording interference fringes on the hologram recording material 40a or by recording a pattern of interference fringes with a hologram printer. Alternatively, by optically duplicating the manufactured hologram imaging lens 40, mass production can be easily achieved. The hologram imaging lens 40 with a simple configuration can thus be easily manufactured and mass-produced. Therefore, the hologram imaging lens 40 and the aerial imaging device 30 can be sufficiently supplied for the growing demand.

The image light emitted by the display device 31 is divergent light. By emitting the diverging image light to the hologram imaging lens 40, it becomes possible to visually recognize the formed image from a wide range of angles. Therefore, it is possible to make it easier for the observer to recognize the formed image.

Hologram imaging lens 40 is a volume hologram. A volume hologram is less likely to generate diffracted light of second or higher order. Therefore, the image light incident on the hologram imaging lens 40 can be efficiently imaged at the imaging position 45 . That is, the image becomes clearer and can be easily observed by the observer.

The hologram imaging lens 40 is a reflective hologram. In this case, the hologram imaging lens 40 forms an image on the side on which the image light serving as the reproduction light is incident. That is, the display device 31 and the imaging position 45 are positioned on the same side with respect to the hologram imaging lens 40 . When such an aerial imaging device 30 is provided in the existing second display device 11 , all constituent elements of the aerial imaging device 30 can be provided on the display surface 12 side of the second display device 11 . Therefore, the aerial imaging device 30 and the aerial input device 20 can be easily provided to the existing second display device 11 to form the display device 10 with the aerial imaging device.

The hologram imaging lens 40 forms images of red wavelength light, green wavelength light, and blue wavelength light, respectively. That is, the hologram imaging lens 40 can form a full-color image.

In the present embodiment, the display device 31 includes red wavelength light, green wavelength light, and blue wavelength light so that the image formed by the hologram imaging lens 40 has a desired color. Image light is emitted. In other words, the display device 31 emits light of each wavelength according to the characteristics of the hologram imaging lens 40 . Even if the hologram imaging lens 40 has a different diffraction efficiency for each wavelength, by adjusting the amount of light of each wavelength included in the image light of the display device 31, the image formed by the hologram imaging lens 40 can be obtained. It can be any desired color, ie, the color that it is intended to exhibit. Alternatively, the diffraction efficiency of each wavelength of the hologram imaging lens 40 is designed so as to correspond to the proportion of light of each wavelength emitted by the display device 31 . Again, the image formed by the hologram imaging lens 40 can be the desired color, ie, the color intended to appear.

The image light enters the hologram imaging lens 40 at an incident angle forming the Brewster's angle. In this case, only one polarization component of the incident light is reflected by the surface of hologram imaging lens 40 . The image light reflected by the surface of the hologram imaging lens 40 can deteriorate the visibility of the image. Light containing only one polarization component can be easily made invisible by, for example, providing an additional polarizing plate. For this reason, the image light reflected by the surface of the hologram imaging lens 40 is made invisible, and deterioration of the visibility of the formed image can be suppressed.

The imaging position 45 is observed from a direction different from the direction in which the image light enters the hologram imaging lens 40 . Therefore, when the observer inputs information by the position detection sensor 21 of the aerial input device 20 with the finger F or the like, the image light from the display device 31 is less likely to be blocked by the finger F. That is, even when information is input by the position detection sensor 21, the image can be clearly displayed.

The imaging position 45 is between the display device 31 and the hologram imaging lens 40 . That is, the display device 31 and the imaging position 45 are positioned on the same side with respect to the hologram imaging lens 40 . When such an aerial imaging device 30 is provided in the existing second display device 11 , all constituent elements of the aerial imaging device 30 can be provided on the display surface 12 side of the second display device 11 . Therefore, the aerial imaging device 30 can be easily installed in the existing second display device 11 .

The imaging position 45 is separated from the hologram imaging lens 40 by 15 mm or more. Since the imaging position 45 and the hologram imaging lens 40 are sufficiently separated, for example, if the position detection sensor 21 has detection sensitivity in accordance with the imaging position 45, when the finger F points to the image, In addition, it is difficult for the finger F to touch the hologram imaging lens 40 . Therefore, it is possible to suppress contact infection such as virus in the hologram imaging lens 40 . In addition, it is possible to prevent the hologram imaging lens 40 from being stained with fingerprints or the like, which makes it difficult to form an image.

Aerial imaging device 30 further includes imaging landmarks 35 that indicate imaging positions 45 . Since such an imaging mark 35 serves as a guideline for the imaging position 45 , the image formed at the imaging position 45 can be easily observed by the observer.

Hologram imaging lens 40 is transparent. Therefore, the display surface 12 of the second display device 11 can be observed through the hologram imaging lens 40 in the display device 10 having the aerial imaging device 30 . Therefore, the image displayed on the display surface 12 and the image formed by the aerial imaging device 30 can be observed simultaneously.

The hologram imaging lens 40 includes a plurality of element hologram forming portions 41 provided with interference fringes and element hologram non-forming portions 42 between the element hologram forming portions 41 . Since the hologram imaging lens 40 has the element hologram non-forming portion 42 where no interference fringes are provided, the light can pass through this portion without being diffracted. Therefore, the image displayed on the display surface 12 of the second display device 11 can be clearly observed through the hologram imaging lens 40 in the display device 10 with the aerial imaging device 30. can.

The aerial input device 20 has a sensor mark 25 indicating an area in which the position detection sensor 21 can detect the position. According to such a sensor mark 25, it is possible to make it easier for the position detection sensor 21 to recognize the area in which the position can be detected. This allows the observer to easily input the position information. Also, contact with the hologram imaging lens 40 or the like is suppressed.

As described above, the aerial imaging device 30 of the present embodiment includes the display device 31 that emits image light, and the hologram imaging lens 40 that forms an image of the image light emitted from the display device 31 at the imaging position 45. , provided. Such an aerial imaging device 30 can form an image in the air with a simple configuration including a hologram imaging lens 40 in which interference fringes are recorded.

Various modifications can be made to this embodiment.

For example, as shown in FIG. 9, the aerial imaging device 30 further has an optical member 37 including a second reflective hologram between the display device 31 and the hologram imaging lens 40. good too. In the illustrated example, the optical member 37 is spaced apart from the hologram imaging lens 40 . Also, the optical member 37 is provided at an angle with respect to the hologram imaging lens 40 . In this case, image light emitted from the display device 31 first enters the optical member 37 . In the optical member 37, the image light is reflected while being diffracted by the second reflection hologram. After that, the image light is diffracted and reflected again at the hologram imaging lens 40 to form an image at the imaging position 45 .

By diffracting the image light not only at the hologram imaging lens 40 but also at the optical member 37 , wavelength dispersion of the image light due to diffraction at the optical member 37 can be reduced by wavelength dispersion due to diffraction at the hologram imaging lens 40 . . That is, it is possible to reduce wavelength dispersion in an image to be formed. Therefore, an image can be clearly displayed with a desired color.

Note that the positional relationship between the optical member 37 and the hologram imaging lens 40 is not limited to the illustrated example. For example, the optical member 37 may be provided so as to be laminated on the hologram imaging lens 40 . In this case, the hologram imaging lens 40 and the optical member 37 are substantially parallel.

In the above-described embodiment, the automobile 1 as a moving object has the center console 5 configured by the display device 10 with an aerial image forming device, but is not limited to this, and other members such as an instrument panel may be included. It may be composed of the display device 10 with an aerial imaging device. Also, the automobile 1 may have only the aerial input device 20 without the second display device 11 . Alternatively, the automobile 1 may have only the aerial imaging device 30 without the position detection sensor 21 of the aerial input device 20 .

The aerial imaging device 30 may be combined with a contact-type position detection sensor along a normal plane, a so-called touch panel sensor, or the like, instead of the position detection sensor 21 having sensitivity at the position corresponding to the imaging position 45 .

Further, the display device 10 with an aerial imaging device, the aerial input device 20, and the aerial imaging device 30 may be provided on a moving body other than the automobile 1, or may be provided on a device or member other than the moving body. may For example, the display device 10 with an aerial imaging device, the aerial input device 20, and the aerial imaging device 30 can be used in automatic teller machines (ATMs), ticket vending machines, ordering machines, vending machines, image and photo printers, game arcades, etc. You may provide in the housing|casing etc. for amusement installed in etc.

1 automobile 5 center console 10 display device 11 with aerial imaging device 2nd display device 12 display surface 20 aerial input device 21 position detection sensor 25 sensor mark 30 aerial imaging device 31 display device 35 imaging mark 37 optical member 40 hologram Image lens 41 Elemental hologram forming portion 42 Elemental hologram non-forming portion 45 Imaging position

Claims (17)

a second display device having a display surface;
An aerial imaging device comprising: a display device that emits image light; and a hologram imaging lens that forms an image of the image light emitted from the display device at an imaging position , wherein the hologram is formed on the display surface. and an aerial imaging device provided with an image lens . 2. The display device with an aerial imaging device according to claim 1, wherein said image light is divergent light. 3. The display device with an aerial imaging device according to claim 1, wherein said hologram imaging lens is a volume hologram. 4. The display device with an aerial imaging device according to claim 1, wherein said hologram imaging lens is a reflective hologram. 5. The display device with an aerial imaging device according to claim 1, wherein said hologram imaging lens forms images of light of red wavelength, light of green wavelength, and light of blue wavelength, respectively. . The display device emits image light including red wavelength light, green wavelength light, and blue wavelength light so that the image formed by the hologram imaging lens has a desired color. 6. The display device with an aerial imaging device according to claim 5. 7. The display device with an aerial imaging device according to claim 1, further comprising an optical member including a second reflective hologram between said display device and said hologram imaging lens. 8. The display device with an aerial imaging device according to claim 1, wherein said image light is incident on said hologram imaging lens at an incident angle forming Brewster's angle. 9. The display device with an aerial imaging device according to claim 1, wherein said imaging position is observed from a direction different from a direction in which said image light enters said hologram imaging lens. 10. The display device with an aerial imaging device according to claim 1, wherein said imaging position is between said display device and said hologram imaging lens. 11. The display device with an aerial imaging device according to claim 1, wherein the distance between said imaging position and said hologram imaging lens is 15 mm or more. 12. The display device with an aerial imaging device according to any one of claims 1 to 11, further comprising an imaging mark indicating said imaging position. 13. The display device with an aerial imaging device according to any one of claims 1 to 12, wherein said hologram imaging lens is transparent. 14. The hologram imaging lens according to any one of claims 1 to 13, wherein the hologram imaging lens includes a plurality of element hologram forming portions provided with interference fringes and element hologram non-forming portions between the element hologram forming portions. A display device with an aerial imaging device as described. 15. The display device with an aerial imaging device according to claim 1 , further comprising a position detection sensor having sensitivity at a position corresponding to said imaging position. 16. The display device with an aerial imaging device according to claim 15, further comprising a sensor mark indicating an area in which said position detection sensor can detect a position. A moving object comprising the display device with an aerial imaging device according to any one of claims 1 to 16 .

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