JP2013142841A - Spatial video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spatial video display device that allows a user to view continuously bright spatial video if a visual line is moved in lateral direction from a visual line direction on design.SOLUTION: A spatial video display device 100 includes a flat plate-like reflection type plane-symmetric imaging element 2 for reflecting light from a substantial section 1 toward an observer, and a driving device 4 for moving the reflection type plane-symmetric imaging element 2 in the flat plate plane. The driving device 4 causes the reflection type plane-symmetric imaging element 2 to perform periodic movement including at least rotation or turning.

Description

  The present invention relates to a spatial image display apparatus that displays an image in a space, and more particularly to a spatial image display apparatus that uses a reflection-type plane-symmetric imaging element that focuses light at a plane-symmetrical position.

  Conventionally, various optical elements have been developed in order to realize a realistic three-dimensional aerial image. For example, in Patent Document 1, an image of an object that is a projection object placed on one side of an element is formed at a position that is plane-symmetrical on the opposite side of the element by using a reflective surface-symmetric imaging element. A spatial video display device is disclosed. The reflection-type plane-symmetric imaging element used in this spatial image display device has a plurality of holes that penetrate a predetermined base in the thickness direction, and is a unit optical system that is composed of two mirror surface elements orthogonal to the inner wall of each hole An element is formed, and when light is transmitted from one surface direction of the substrate to the other surface direction through the hole, the light is reflected once by each of the two mirror elements. The light emitted from the projection is reflected by one of the two mirror elements when passing through the unit optical element of the reflective surface-symmetric imaging element, and then reflected by the mirror surface to become reflected light. The light is reflected by the other of the two specular elements of the unit optical element, and the projection object is imaged at a position reflected on the virtual mirror.

  However, since the above-described optical element requires a very fine processing technique, a spatial image display device using such an optical element has a problem that manufacturing costs are high. In view of this, the present applicant has proposed a reflection-type plane-symmetric imaging element that does not require manufacturing costs in Patent Document 2.

  1 to 3 are diagrams showing the configuration of a reflection-type plane-symmetric imaging element proposed in Patent Document 2. FIG. FIG. 1 is an external view of a reflective plane-symmetric imaging element, FIG. 2 is an external view of a rectangular parallelepiped material constituting the reflective plane-symmetric imaging element, and FIG. 3 is two mirror sheets forming the reflective plane-symmetric imaging element It is an external view which shows these combinations.

  As shown in FIGS. 1 and 3, the reflection-type plane-symmetric imaging element 2 includes two mirror sheets 21 and 22 each formed by closely contacting a large number of rod-shaped rectangular parallelepiped materials 20 in parallel.

  As shown in FIG. 2, the rectangular parallelepiped material 20 is a long member, and is represented by transparent acrylic whose one side of a rectangular cross section in the direction perpendicular to the longitudinal direction, that is, in the short direction, is several hundred μm to several cm. Made of plastic or glass rod. The length varies depending on the size of the projected image, but is about several tens mm to several m. Note that three of the four surfaces extending in the longitudinal direction are surfaces used for light transmission or reflection, and thus are in a smooth state. About 100 to 20000 rectangular parallelepiped materials 20 are used for each of the mirror sheets 21 and 22.

  As shown in FIG. 2, a light reflecting film 23 is formed on one surface of the rectangular parallelepiped material 20 extending in the longitudinal direction, thereby forming the light reflecting surface 23. The light reflecting film 23 is formed by vapor deposition or sputtering of aluminum or silver.

  With respect to such a plurality of rectangular parallelepiped materials 20, the opposite surface 24 opposite to the surface on which the light reflecting surface 23 of one rectangular parallelepiped material 20 is formed and the light reflecting surface 23 of another rectangular parallelepiped material 20 are brought into close contact with each other. , 22 are formed. As shown in FIG. 3, the mirror sheets 21 and 22 are bonded together in a state in which one of the rectangular parallelepiped materials 20 is rotated by 90 degrees so that the parallel directions of the rectangular parallelepiped materials 20 cross each other. 2 is formed. A portion where each rectangular parallelepiped material 20 of the mirror sheet 21 and each rectangular parallelepiped material 20 of the mirror sheet 22 intersect constitutes a minute mirror unit (unit optical element), and the light reflecting surface 23 of the mirror sheet 21 of each minute mirror unit is the first. The light reflecting surface 23 of the mirror sheet 22 becomes the second light reflecting surface.

  In the spatial image display apparatus using such a reflective plane-symmetric imaging element 2, as shown in FIG. 4, an object (display unit) 1 is disposed on one surface side of the reflective plane-symmetric imaging element 2, Light from the object 1 is incident on the reflective surface-symmetric imaging element 2 obliquely. The observer's eye E is located on the other surface side of the reflective surface-symmetric imaging element 2, and the real image 3, that is, the spatial image 3, is located at a spatial position that is plane-symmetric with the object 1 with respect to the reflective surface-symmetric imaging element 2. Is formed. Note that the lower end A and the upper end A ′, which are both ends of the reflective plane-symmetric imaging element 2 in FIG. 4, correspond to the opposing angles A and A ′ of the reflective plane-symmetric imaging element 2 in FIG. 1. More specifically, as shown in FIG. 5, the light from the object 1 is reflected on the light reflecting surface 23 (second light reflecting surface) of the mirror sheet 22 in the direction of the arrow Y1, and the reflected light is reflected in the direction of the arrow Y2. Since the light is reflected on the light reflecting surface 23 (first light reflecting surface) of the mirror sheet 21 and the reflected light travels toward the viewer in the direction of the arrow Y3, each light reflecting surface 23 of the reflective surface-symmetric imaging element 2 is reflected. Each of them is reflected once, that is, twice to create a mirror image.

JP 2008-158114 A International Publication No. WO2009 / 136578 Pamphlet

  However, in the spatial video display device disclosed in Patent Document 2, when the line of sight is shifted from the design line-of-sight direction in the left-right direction (left-right direction shown in FIG. 1; the direction perpendicular to the paper surface in FIG. 4), the mirror sheet 21 22, the light that is transmitted without being reflected and the light that is reflected twice or more are increased, that is, the light that is reflected only once is reduced in each of the mirror sheets 21 and 22, and the spatial image There was a problem that the brightness became dark. As described above, conventionally, there is a problem that the brightness of the spatial image differs depending on the image forming position.

  The present invention has been made in view of the above circumstances, and as an example of the problem, a spatial video display device capable of visually recognizing bright spatial images continuously even when the visual line is moved in the horizontal direction from the designed visual line direction. Is to provide.

  In order to achieve the above object, the invention according to claim 1 includes a flat plate-like reflective surface-symmetric imaging element that reflects light from the substantial part toward an observer, and the reflective surface-symmetric imaging element. A spatial image display device including a driving device that moves in a plane of the flat plate, wherein the reflective surface-symmetric imaging element includes a first light reflection surface and the first light reflection surface in a plate thickness direction. The entity is provided with one or a plurality of unit optical elements each including a second light reflecting surface orthogonal to the first light reflecting surface and the first light reflecting surface and the second light reflecting surface. The light incident from the portion is reflected once each on the first light reflecting surface and the second reflecting surface in the predetermined unit optical element, and the position of the substantial portion on the other side of the plate surface A mirror image with respect to the light from the substantial part at a position symmetrical to the plane, and the driving device , With respect to the reflective surface symmetric imaging element, characterized in that to perform the periodic motion including at least rotation or rotation.

It is an external view of a reflection type plane-symmetric image formation element. It is an external view of the rectangular parallelepiped material which comprises the reflection type plane-symmetric image formation element of FIG. It is a figure which shows the combination of two mirror sheets which form the reflection type plane-symmetric image formation element of FIG. It is the schematic of the optical system of the spatial image display apparatus using the reflection type plane-symmetric image formation element of FIG. It is a schematic diagram which shows a mode that light reflects twice in the reflection type plane-symmetric image formation element of FIG. 1 is a schematic configuration diagram of a spatial video display device according to a first embodiment of the present invention. FIG. 9 is a diagram for explaining the relationship between the operation of the reflective surface-symmetric imaging element and the brightness of the spatial image in the spatial image display device according to the embodiment of the present invention, together with FIG. FIG. 8 is a diagram for explaining the relationship between the operation of the reflective surface-symmetric imaging element and the brightness of the spatial image in the spatial image display device according to the embodiment of the present invention, together with FIG. FIG. 11 is a graph comparing the brightness of the reflective surface-symmetric imaging element in the spatial image display device according to the embodiment of the present invention with and without an arc motion, along with FIG. 10. FIG. 10 is a graph comparing the brightness of the reflective surface-symmetric imaging element in the spatial image display device according to the embodiment of the present invention with and without an arc motion, together with FIG. 9. It is a schematic block diagram of the spatial video display apparatus which concerns on the 2nd Embodiment of this invention. It is a schematic block diagram of the spatial image display apparatus which concerns on the 3rd Embodiment of this invention. It is a schematic block diagram of the modification of the spatial video display apparatus concerning the 3rd Embodiment of this invention. It is a schematic block diagram of the spatial image display apparatus which concerns on the 4th Embodiment of this invention. It is a schematic block diagram of the modification of the spatial video display apparatus concerning the 4th Embodiment of this invention. It is an external view of another example of a reflection type plane-symmetric image formation element. It is an external view of another example of a reflection type plane-symmetric image formation element.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>
FIG. 6 is a schematic configuration diagram of the spatial video display device 100 according to the first embodiment of the present invention. The spatial image display device 100 displays a spatial image with little change in brightness in the left-right direction, that is, with a wide viewing angle in the left-right direction, by rotating the reflective plane-symmetric imaging element in the left-right direction. This is a spatial video display device. The spatial image display device 100 includes, for example, a substantial part 1 composed of, for example, an object, a display, etc., a planar plate-like reflection-type plane-symmetric imaging element 2, and a reflection-type plane-symmetric imaging element 2 in the plane. And a drive device 4 that periodically rotates in the left-right direction. In this embodiment, directions are described using the directions defined in FIG.

  The reflection type plane symmetric imaging element 2 is the same as the reflection type plane symmetric imaging element 2 shown in FIGS. The direction shown in FIG. 6 in the reflective plane-symmetric imaging element 2 is associated with the direction shown in FIG.

  Specifically, the drive device 4 is an arc drive device using an eccentric cam, a spring, and a motor, and causes the reflection type plane-symmetric imaging element 2 to draw an arc in the horizontal direction (direction parallel to the plate surface). Perform reciprocal motion. As a result, the reflection-type plane-symmetric imaging element 2 periodically performs an arc motion in the left-right direction within an angle of ± 20 degrees around the fulcrum portion 101 attached to one end of the reflection-type plane-symmetric imaging element 2. Do.

  Here, with reference to FIGS. 7 and 8, the rotation operation of the reflective plane-symmetric imaging element 2 and the brightness of the spatial image 3 will be described. 7 and 8 are external views of the reflective plane-symmetric imaging element 2 in the spatial image display device 100 as viewed from above.

  FIGS. 7A and 7B are top views when one reflection type plane-symmetric imaging element 2 is not moved. FIG. 7A is a diagram showing the direction of the brightest light beam output from the reflective plane-symmetric imaging element 2 by an arrow. FIG. 7B is a diagram showing the light intensity of the spatial image 3 seen from the observer's viewpoint position E in the case of FIG. 7A with an arrow, and the light intensity is represented by the thickness of the arrow. ing. As shown in FIG. 7B, the spatial image 3 has the brightest central portion, and the peripheral portion becomes darker as the line of sight is shifted in the left-right direction. Further, the region where the spatial image 3 can be seen (the viewing angle in the left-right direction) is narrow.

  FIGS. 8A and 8B are top views when the three reflection-type plane-symmetric imaging elements 2 are not moved. The three reflection-type plane-symmetric imaging elements 2 are arranged in a fan shape around the viewpoint position. FIG. 8A is a diagram showing the direction of the brightest light beam output from the reflective plane-symmetric imaging element 2 by an arrow. FIG. 8B is a diagram showing the light intensity of the spatial image 3 seen from the viewpoint position E of the observer in the case of FIG. 8A with an arrow, and the light intensity is represented by the thickness of the arrow. ing. In this case, since light arrives not only from the reflection-type plane-symmetric imaging element 2 arranged at the center but also from the reflection-type plane-symmetric imaging element 2 arranged at the left and right, an area where the spatial image 3 can be seen (left and right) (The viewing angle of the direction) is wider than in the case of a single sheet (FIGS. 7A and 7B), but the direction of the brightest ray by design does not coincide with the line of sight of the observer. As the line of sight is shifted, the spatial image 3 becomes darker. That is, in this case, as shown in FIG. 8B, the area where the spatial image 3 can be seen (the viewing angle in the left-right direction) is widened, but the center portion of the spatial image 3 is the brightest and the horizontal direction As you shift your line of sight, the surrounding area becomes extremely dark.

  On the other hand, FIGS. 7C and 7D are top views in the case where one reflection type plane-symmetric imaging element 2 is moved in a circular arc in the left-right direction. FIG. 7C is a diagram showing the direction of the brightest light beam, which is output from the reflection-type plane-symmetric imaging element 2, by design with an arrow. FIG. 7D is a diagram showing the light intensity of the spatial image 3 seen from the viewpoint position E of the observer in the case of FIG. 7C with an arrow, and the light intensity is represented by the thickness of the arrow. ing. In this case, as in the case of three images (FIGS. 8A and 8B), the area in which the spatial image 3 can be seen (the viewing angle in the left-right direction) is widened, and the direction of the brightest light beam is designed. Since scanning is performed, the change in brightness in the left-right direction is reduced. That is, in this case, as shown in FIG. 7D, the area where the spatial image 3 can be seen (the viewing angle in the left-right direction) is widened, and the brightness difference between the central portion and the peripheral portion of the spatial image 3 is large. Since it becomes small, the observer can visually recognize the bright spatial image 3 continuously.

  This is because, by causing the reflection-type plane-symmetric imaging element 2 to perform a circular arc motion periodically, the emission angle of the brightest light beam in design is not uniform, but changes within a predetermined angle in time. This is because the direction of the brightest light beam by design matches the viewing direction of the observer. Therefore, in this case, even if the observer moves and the observer's viewpoint position E shifts back and forth and right and left, the observer can visually recognize the bright spatial image 3 continuously.

  In this case, the central portion of the spatial image 3 is the brightest, but the reflective plane-symmetric imaging element 2 is not moved (FIGS. 7A and 7B, FIGS. 8A and 8B). Compared with, the central part becomes darker.

  9 and 10 show a case where one reflection type plane-symmetric imaging element 2 is not moved (in the case of FIGS. 7A and 7B), and one reflection type plane-symmetric imaging element 2. 8 is a graph showing the brightness of the spatial image when arc is moved in a circular arc in the left-right direction (in the case of FIGS. 7C and 7D). 9 and 10, when one reflection-type plane-symmetric imaging element 2 is not moved, a dotted line, and when one reflection-type plane-symmetric imaging element 2 is moved in an arc in the left-right direction, It is represented by a solid line.

  FIG. 9 is a graph in which the vertical axis represents absolute luminance, and the horizontal axis represents the viewing angle from the designed viewing direction (angle 0 degrees), that is, the viewing angle, that is, the viewing angle. It is a graph when the luminance is normalized on the axis (normalized with brightness of 100 when the angle is 0 degree) and the viewing angle is on the horizontal axis. As shown in FIG. 9, when one reflection-type plane-symmetric imaging element 2 is moved in a circular arc in the left-right direction, compared with a case where one reflection-type plane-symmetric imaging element 2 is not moved. Although the spatial image 3 at the center (angle 0 degree) is dark, as shown in FIGS. 9 and 10, even if the line of sight is changed in the left-right direction, the decrease in brightness of the spatial image 3 is small. On the other hand, when one reflection-type plane-symmetric imaging element 2 is not moved, the brightness of the spatial image 3 decreases rapidly when the line of sight is changed in the left-right direction. Here, when the effective viewing angle range is defined as a viewing angle range in which the brightness of the imaged spatial image 3 is a value that is half or more of the maximum brightness (the brightness when the angle is 0 degrees), one reflection type plane symmetry The effective viewing angle range when the imaging element 2 is moved in a circular arc in the left-right direction is about ± 24 degrees, and the effective viewing angle range when one reflection type plane-symmetric imaging element 2 is not moved is about Since the angle is ± 12 degrees, the former can obtain an effective viewing angle range approximately twice that of the latter.

  As described above, according to the present embodiment, even in the peripheral portion of the spatial image 3, the luminance decrease is smaller than that in the central portion, so that the spatial image 3 having a wide viewing angle can be provided. As a result, the observer can continuously observe a bright spatial image even if he / she moves his / her line of sight from the designed line-of-sight direction.

  In the present embodiment, as the periodic motion of the reflective surface-symmetric imaging element 2, an arc motion, that is, a rotational motion that rotates in both forward and reverse directions within a restricted angle range is used. The periodic motion of the imaging element 2 is not limited to the arc motion. Circular motion or elliptical motion, that is, rotational motion that rotates in one direction without restricting the angle range may be used. Moreover, any motion including at least such a rotational motion or a rotational motion may be used, and a motion combining a rotational motion or a rotational motion with a translational motion may be used. Similarly, the drive device 4 is not limited to the configuration shown in FIG. 6 as long as it is a device that can execute at least a rotational motion or a motion including a rotational motion.

  By the way, it is preferable that the period of the arc motion of the reflection-type plane-symmetric imaging element 2 described above is at least 1 cycle 1/25 seconds or less, that is, the arc motion is performed at 25 Hz or more, and more preferably 1 cycle 1/1 / It is preferable to perform the arc motion at 50 seconds or less, that is, at 50 Hz or more. This numerical value is based on a numerical value of a frame rate suitable for a human to recognize a moving image.

  In addition, in the present embodiment, the reflective surface-symmetric imaging element 2 may observe the interval (pitch) between the adjacent light reflecting surfaces 23 of the mirror sheets 21 and 22 due to its configuration. Since the reflective surface-symmetric imaging element 2 is moved in a circular arc at a predetermined speed, the pitch is not observed. That is, the spatial video display device 100 of the present embodiment also has an effect of eliminating the rough feeling of the spatial video 3 due to the pitch.

  Further, in the spatial image display device 100 of the present embodiment, the single reflection-type plane-symmetric imaging element 2 is moved in a circular arc, but the present invention is not limited to this. For example, as shown in FIGS. As shown, a plurality of reflection type plane-symmetric imaging elements 2 arranged on a sector may be moved in an arc.

  In this case, a spatial image 3 with a wide viewing angle can be provided, and the joint of the reflection-type plane-symmetric imaging element 2 (between the reflection-type plane-symmetric imaging element 2 and the reflection-type plane-symmetric imaging element 2). ) Is also not observed.

<Second Embodiment>
FIG. 11 is a schematic configuration diagram of a spatial video display apparatus 200 according to the second embodiment. In the spatial image display device 200, a plurality (eight in FIG. 11) of reflection type plane-symmetric imaging elements 2 are attached to the disc 8 so as to be even in the circumferential direction. The drive device 4 is rotationally driven. Specifically, the disc 8 is an opaque plate and is formed in a disc shape, and a rectangular hole is formed at a portion to which the reflective surface-symmetric imaging element 2 is attached. Therefore, when the reflective plane-symmetric imaging element 2 is attached to the disk 8, the observer does not see unnecessary light, and the space in which the light transmitted through the reflective plane-symmetric imaging element 2 forms an image. Only video 3 can be observed.

  According to the present embodiment, since the reflection-type plane-symmetric imaging element 2 is rotated, a spatial image 3 with a wide viewing angle can be provided. As shown in FIG. 11, in the case of the eight reflection-type plane-symmetric imaging elements, the rotational speed is 6 or more rotations per second in view of the cycle of the circular motion described in the first embodiment. Is preferred.

  Further, in the present embodiment, the case of eight reflection type plane symmetric imaging elements 2 has been described, but the number of reflection type plane symmetric imaging elements 2 attached to the disk 8 is limited to this. is not. For example, you may increase / decrease to about 1-12 sheets according to a use.

  In order to use the light emitted from the substantial part 1 more effectively, the reflection-type plane-symmetric imaging element 2 is formed in a fan shape or a trapezoidal shape, and the adjacent reflection-type plane-symmetric imaging element 2 is formed. You may make small the space | interval (opaque part) between.

<Third Embodiment>
FIG. 12 is a schematic configuration diagram of a spatial image display device 300 in which the entire outer peripheral portion of the disk 8 is configured with a reflection-type plane-symmetric imaging element in order to more effectively use the light emitted from the entity unit 1. It is. Specifically, the disk 8 is an outer periphery formed by adjoining an inner peripheral portion formed of an opaque plate and a plurality (eight in FIG. 12) of fan-shaped reflection-type surface-symmetric imaging elements 2A without any gaps. And have a part.

  According to the present embodiment, since the entire outer peripheral portion of the disk 8 is composed of the reflective plane-symmetric imaging element 2A, a spatial image with a wide viewing angle can be obtained wherever the observer is 360 degrees around the disk 8. 3 can be provided.

  The spatial image 3 is observed in the depth direction when viewed from the position of the observer, but unnecessary light may be observed in the left-right direction separately from this. This unnecessary light is light that is reflected only once in the reflection-type plane-symmetric imaging element 2. For this reason, the spatial image display apparatus 300 may be devised so as not to observe such unnecessary light.

  FIG. 13 is a schematic configuration diagram of a spatial video display device 301 that adopts a configuration that blocks unnecessary light. In the spatial image display device 301, a plurality of human sensors 6 are provided on the periphery of the disk 8, and the partially transmissive liquid crystal 7 is placed on the disk 8 so as to cover the entire disk. In other words, the spatial image display device 301 detects the position of the observer by the human sensors 6 provided on the periphery of the disk 8 and causes the partially transmissive liquid crystal 7 in a predetermined region to act according to the detected position. Thus, a region through which unnecessary light is transmitted is shielded. For example, as shown in FIG. 14, only the reflection-type surface-symmetric imaging element 2 in the back direction is transmitted with respect to the position of the observer detected by the human sensor 6, and others (front and near to the position of the observer). The reflection-type plane-symmetric imaging element 2A (left and right direction) may be shielded so that unnecessary light is not observed.

<Fourth embodiment>
FIG. 14 is a main part configuration diagram of a spatial video display apparatus 400 according to the fourth embodiment. The spatial video display device 400 is provided with a plurality of the entity units 1 (four display units 1 in FIG. 13) compared to the spatial video display device 300 according to the third embodiment. In this case, a clearer spatial image 3 can be observed wherever the observer is around the disc 8.

  In the present embodiment, a configuration that blocks unnecessary light may be adopted as in the case of the third embodiment.

  FIG. 15 is a schematic configuration diagram of a spatial video display device 401 incorporating a configuration for blocking unnecessary light. The spatial image display device 401 detects the position of the observer with the human sensors 6 provided on the periphery of the disk 8, and determines one display unit 1 to be lit according to the detected position. Only the determined display unit 1 is lit. For example, only the display unit 1 that forms the spatial image 3 observed in the depth direction with respect to the position of the observer detected by the human sensor 6 may be turned on.

<Other embodiments>
Further, the configuration of the reflection-type plane-symmetric imaging element is not limited to the configuration in which the two mirror sheets are formed using the rectangular parallelepiped material that is the longitudinal member shown in FIGS. Any configuration may be used as long as it is an optical element that forms a real image at a position that is plane-symmetric with respect to the reflective plane-symmetric imaging element.

  For example, the configuration of a reflection-type plane-symmetric imaging element disclosed in Japanese Patent Application Laid-Open No. 2008-158114 may be used. FIG. 16 is an external perspective view of such a reflective surface-symmetric imaging element 5. More specifically, the reflection-type plane-symmetric imaging element 5 includes a plurality of holes 52 penetrating a predetermined base 51 in the thickness direction, and includes two mirror surface elements 54 a and 54 b orthogonal to the inner wall of each hole 52. The unit optical element 53 is formed, and when light is transmitted from one surface direction of the base 51 to the other surface direction through the hole, the light is reflected once by the two mirror surface elements 54a and 54b. You may do it. In addition, as shown in FIG. 17, a large number of transparent cylindrical bodies 55 projecting in the thickness direction of a predetermined base 51 are formed on the grid, and two orthogonal walls among the inner wall surfaces of each cylindrical body 55 are formed. The reflective surface-symmetric imaging element 5A may be a mirror surface element 54a or 54b.

  According to the above-described embodiment, a flat reflective surface-symmetric imaging element (for example, a reflective surface-symmetric connection) that reflects light from the substantial part (for example, the substantial part 1) toward the observer. An image element 2, 5, 5A) and a driving device (for example, driving device 4) that moves the reflection-type plane-symmetric imaging element in the plane of the flat plate (for example, a space). The reflection type plane-symmetric imaging element is a first light reflection surface (for example, a light reflection surface 23 of the mirror sheet 21) in the plate thickness direction, which is an image display device 100, 200, 300, 301, 400, 401). A mirror surface element 54a) and a second light reflection surface orthogonal to the first light reflection surface (for example, the light reflection surface 23 of the mirror sheet 22, the mirror surface element 54b), and the first light reflection surface and the second light reflection surface. One or more unit optical elements composed of The light incident from the substance part arranged on one side of the plate surface is reflected once each on the first light reflecting surface and the second reflecting surface in the predetermined unit optical element, On the other side of the plate surface, a mirror image with respect to the light from the substantial part is created at a position symmetrical to the position of the substantial part. The basic configuration is to execute a periodic motion including at least rotation or rotation.

  In the above basic configuration, since the emission angle of the brightest light beam is not uniform and changes within a predetermined time with respect to time, the direction of the brightest light beam periodically coincides with the observer's line of sight. Even if the line of sight is moved in the left-right direction from the line-of-sight direction, a bright spatial image can be viewed continuously.

  A plurality of the reflection-type plane-symmetric imaging elements; and the flat surfaces of the plurality of reflection-type plane-symmetric imaging elements are arranged on the same plane and at substantially equal intervals in the circumferential direction. An arranged circular table (for example, a disk 8) may be provided, and the driving device may rotate the circular table.

  In this case, since a plurality of reflection type plane-symmetric imaging elements are rotated, a spatial image with a wide viewing angle can be viewed.

  The circular table may be made of an opaque material between the adjacent reflection-type plane-symmetric imaging elements.

  In this case, the observer can observe only the spatial image formed by the light transmitted through the reflective plane-symmetric imaging element without seeing unnecessary light.

  On the other hand, the circular table may be provided with a plurality of the reflection-type plane-symmetric imaging elements adjacent to each other without a gap.

  In this case, a spatial image with a wide viewing angle can be viewed wherever the observer is 360 degrees around the circular table.

  In addition, when a plurality of reflection-type plane-symmetric imaging elements are arranged on the circular table so as to be adjacent to each other without any gap, they are arranged on the entire table surface of the circular table, and the light transmission state can be controlled. Liquid crystal panel (for example, partially transmissive liquid crystal 7), a sensor unit (for example, human sensor 6) for detecting the position of an observer near the periphery of the circular table, and the position of the observer detected by the sensor unit And a control unit that determines a light shielding region and sets the determined region in the liquid crystal panel to a light shielding state.

  In this case, the observer can visually recognize a spatial image formed at a suitable position without seeing unnecessary light.

  Further, when the plurality of reflection-type plane-symmetric imaging elements are arranged adjacent to each other on the circular table without gaps, the substantial part includes a plurality of display parts having different light emission directions (for example, A sensor unit (for example, human sensor 6) configured by a plurality of substance units 1) that detects the position of an observer in the vicinity of the periphery of the circular table, and the position of the observer detected by the sensor unit And a control unit that switches the display unit to be lit.

  In this case, the observer can visually recognize a spatial image formed at a suitable position without seeing unnecessary light.

  Moreover, it is preferable that the period of the said periodic motion is 1/25 second or less.

  In this case, since the motion is in accordance with a suitable frame rate, the moving image can be recognized correctly.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made to the embodiments of the present invention without departing from the gist of the present invention. Such modifications and changes can be made, and those accompanying such modifications and changes are also included in the technical scope of the present invention.

1 Real part (object, display part)
2,2A, 5 Reflective plane-symmetric imaging element 3 Spatial image (real image)
DESCRIPTION OF SYMBOLS 4 Drive device 6 Human sensor 7 Partially transmissive liquid crystal 20 Rectangular material 21, 22 Mirror sheet 23 Light reflection surface 54a, 54b Mirror surface element 100,200,300,301,400,401 Spatial image display device

Claims (7)

A plate-like reflective surface-symmetric imaging element that reflects light from the entity part toward the observer;
A spatial image display device comprising: a drive device that moves the reflection-type plane-symmetric imaging element in a plane of the flat plate;
The reflective surface-symmetric imaging element is:
One or a plurality of unit optical elements each including a first light reflecting surface and a second light reflecting surface orthogonal to the first light reflecting surface in the plate thickness direction are configured by the first light reflecting surface and the second light reflecting surface. The light incident from the substantial part arranged on one side of the plate surface is reflected once each on the first light reflecting surface and the second reflecting surface in the predetermined unit optical element. Then, on the other side of the plate surface, a mirror image with respect to the light from the substantial part is created at a position symmetrical to the position of the substantial part,
The driving device includes:
A spatial image display device characterized in that a periodic motion including at least rotation or rotation is executed on the reflection-type plane-symmetric imaging element. A plurality of the reflection-type plane-symmetric imaging elements;
Each flat plate surface of the plurality of reflection-type plane-symmetric imaging elements includes a circular table disposed on the same plane and at substantially equal intervals in the circumferential direction,
The spatial image display device according to claim 1, wherein the driving device rotates the circular table. The circular table is
3. The spatial image display device according to claim 2, wherein an opaque material is used between adjacent reflection type plane symmetric imaging elements. The circular table is
3. The spatial image display device according to claim 2, wherein a plurality of the reflection-type plane-symmetric imaging elements are arranged adjacent to each other without a gap. A liquid crystal panel disposed on the entire table surface of the circular table and capable of controlling a light transmission state;
A sensor unit for detecting the position of an observer in the vicinity of the periphery of the circular table;
The control unit according to claim 4, further comprising: a control unit that determines an area to be shielded according to an observer position detected by the sensor unit, and sets the determined area on the liquid crystal panel to a light shielding state. Spatial image display device. The substantial part is composed of a plurality of display parts each having different light emission directions,
A sensor unit for detecting the position of an observer in the vicinity of the periphery of the circular table;
The spatial video display device according to claim 4, further comprising a control unit that switches the display unit to be lit according to the position of the observer detected by the sensor unit.   The spatial image display device according to claim 1, wherein the period of the periodic motion is 1/25 seconds or less.

Images