JP5352410B2 - Spatial image display device - Google Patents

Description

  The present invention relates to a spatial video display device that displays video in a space.

  Patent Document 1 discloses a system that uses a reflective surface-symmetric imaging element to form an image of an object, which is a projection object, placed on one side of the element at a position that is plane-symmetrical on the opposite side of the element. Has been. The reflection-type plane-symmetric imaging element used in this system includes a plurality of holes that penetrate a predetermined base in the thickness direction, and is a unit optical element that is composed of two mirror surface elements orthogonal to the inner wall of each hole When the light is transmitted through the hole from one surface direction of the base to the other surface direction, the light is reflected once by each of the two mirror surface 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.

  As shown in FIG. 1, the reflection-type plane-symmetric imaging element 1 has a flat plate shape, and the object 2 is disposed on one surface side of the reflection-type plane-symmetric imaging element 1. The light from the object 2 is incident obliquely. The observer's eye E is positioned on the other surface side of the reflective surface-symmetric imaging element 1, and a real image 3, that is, a spatial image is formed at a spatial position that is plane-symmetric with the object 2 with respect to the reflective surface-symmetric imaging element 1. Is done.

JP 2008-158114 A

  However, in the above-described conventional technology, as shown in FIG. 1, when a three-dimensional structure is used for the object 2, the problem is that the obtained spatial image has its unevenness reversed from the three-dimensional structure of the object 2. There was a point.

  The problems to be solved by the present invention include the above-mentioned problems as an example. To provide a spatial image display device that can form an image in a space while maintaining the three-dimensional shape of the object. It is an object of the invention.

The spatial image display device according to an aspect of the present invention includes a flat structure in which micromirror units having first and second light reflecting surfaces that are orthogonal to each other are arranged in a matrix, and incident light is incident on the first and first light beams. A spatial image display device including first and second reflection-type plane-symmetric imaging elements that are reflected twice by a two-light reflecting surface, wherein the first reflection-type plane-symmetric imaging element is incident light from an object. Is reflected twice by the first and second light reflecting surfaces to form a first real image of the object so as to be plane-symmetric with the object with respect to the first reflective surface-symmetric imaging element, The second reflection-type plane-symmetric imaging element reflects incident light from the first real image twice by the first and second light-reflection surfaces, and the second reflection-type plane-symmetric imaging element Forming a second real image of the object so as to be plane-symmetric with one real image; To have.

According to the spatial image display device of one aspect of the present invention, the incident light from the object is reflected twice by the first and second light reflecting surfaces of the first reflective surface-symmetric imaging element, and the first reflective type. A first real image is formed on the plane-symmetric imaging element so as to be plane-symmetric with the object, and incident light from the first real image is reflected by the first and second light-reflecting plane-symmetric imaging elements. The second real image is formed so that the second reflection type plane-symmetric imaging element is plane-symmetric with the first real image after being reflected twice by the surface. As a result, the second real image becomes an image obtained by inverting the unevenness of the first real image, and is thus displayed as an aerial image having the same unevenness as the object.

  In addition, in the past, it was necessary to produce an object with an inverted concave / convex for a stereoscopic image that was actually desired to be displayed. This makes it possible to set the object itself that is actually desired to be converted into a spatial image.

It is a figure which shows the optical system of the conventional spatial image display apparatus. It is a figure which shows the optical system of the spatial image display apparatus of this invention. It is a figure which shows the reflection type plane-symmetric image formation element in the apparatus of FIG. It is a figure which shows 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 sheet | seat parts which form the reflection type plane-symmetric image formation element of FIG. It is a figure which shows reflection of the display light twice in the reflection type plane-symmetric image formation element of FIG. It is a figure which shows the optical system of the spatial image display apparatus as another Example of this invention. It is a figure which shows the optical system of the spatial image display apparatus as another Example of this invention. It is a figure which shows the optical system of the spatial image display apparatus as another Example of this invention. It is a figure which shows the real image and background on the same eyes | visual_axis of an observer at the time of providing a half mirror. It is a figure which shows the example of an external appearance of the spatial video display apparatus of this invention. It is a figure which shows the internal structure of the apparatus of FIG.

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

  FIG. 2 shows an optical system of the spatial image display device of the present invention. This spatial image display device includes two reflection-type plane-symmetric imaging elements 11 and 12. The reflection-type plane-symmetric imaging elements 11 and 12 have a flat plate shape and are arranged so that the flat plate surfaces are substantially perpendicular to each other. An object 13 of a three-dimensional structure is disposed on one surface side of the reflective surface-symmetric imaging element 11. Light from the object 13 is incident from one surface of the reflective surface-symmetric imaging element 11, reflected by one of the two light reflecting surfaces in the reflective surface-symmetric imaging element 11, and further reflected by the other reflective surface. And output from the other surface of the reflective surface-symmetric imaging element 11. A real image 13 </ b> A of the object 13 is formed on the other surface side of the reflective surface-symmetric imaging element 11, that is, at a spatial position that is plane-symmetric with the object 13.

  The real image 13A is located on one surface side of the reflective surface-symmetric imaging element 12. An observer's eye E is positioned on the other surface side of the reflective surface-symmetric imaging element 12. The light from the real image 13A is incident from one surface of the reflective surface-symmetric imaging element 12, reflected by one of the two light reflecting surfaces in the reflective surface-symmetric imaging element 12, and further reflected by the other reflective surface. And output from the other surface of the reflective surface-symmetric imaging element 12. The real image 13B is formed on the other surface side of the reflective surface-symmetric imaging element 12, that is, at a spatial position that is plane-symmetric with the real image 13A.

  As shown by the arrows in FIG. 2, the light straight line from the object 13 to the reflective plane-symmetric imaging element 11 and the light straight line from the reflective plane-symmetric imaging element 11 to the real image 13A are reflected. The reflection-type plane-symmetric imaging element 11 is arranged at an angular position that intersects approximately at the center of the line 11 and bisects the angle formed by the two light straight lines.

  Similarly, an optical straight line from the real image 13A to the reflective plane-symmetric imaging element 12 and an optical straight line from the reflective plane-symmetric imaging element 12 to the real image 13B intersect at substantially the center of the reflective plane-symmetric imaging element 12. The reflection-type plane-symmetric imaging element 12 is disposed at an angular position that bisects the angle formed by the two light straight lines.

  The real image 13 </ b> A formed by two reflections of the reflective plane-symmetric imaging element 11 has the unevenness of the object 13 reversed. The real image 13B formed by the two reflections of the reflective plane-symmetric imaging element 12 has the concavities and convexities of the real image 13A reversed. Therefore, the observer can observe the real image 13 </ b> B with the same unevenness as the object 13.

  The reflection-type plane-symmetric imaging elements 11 and 12 are formed as shown in FIG. The reflective surface-symmetric imaging element of FIG. The reflection-type plane-symmetric imaging element 19 has two sheet portions (first aggregate and second aggregate) 21 and 22 formed by bringing the same number of rod-shaped rectangular parallelepiped materials 20 into close contact in parallel. Both end portions A and B of the reflection type plane symmetric imaging elements 11 and 12 in FIG. 2 correspond to the opposing angles A and B of the reflection type plane symmetric imaging element 19 in FIG.

  The rectangular parallelepiped material 20 is a long member, and is made of a plastic or glass rod typified by transparent acrylic having a side of a rectangular cross section in a direction perpendicular to the longitudinal direction, that is, a short side, of several hundred μm to several cm. . The length varies depending on the size of the projected image, but is about several tens mm to several m. In addition, 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 sheet portions 21 and 22.

  As shown in FIG. 4, a light reflecting film 23 is formed on one surface of the rectangular parallelepiped material 20 extending in the longitudinal direction. The light reflecting film 23 is formed by vapor deposition or sputtering of aluminum or silver.

  For such a plurality of rectangular parallelepiped materials 20, the sheet portion 21 is brought into close contact with the surface 24 opposite to the surface on which the light absorbing film surface 23 of one rectangular parallelepiped material 20 is formed and the light reflecting film surface of another rectangular parallelepiped material 20. , 22 are formed. As shown in FIG. 5, the sheet portions 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 intersect with each other. Is formed. A portion where each rectangular parallelepiped material 20 of the sheet portion 21 and each rectangular parallelepiped material 20 of the sheet portion 22 intersect constitutes a minute mirror unit (unit optical element), and the light reflecting film surface of the sheet portion 21 of each minute mirror unit is the first. It is the first light reflecting surface of one aggregate, and the light reflecting film surface of the sheet portion 22 is the second light reflecting surface of the second aggregate.

  In addition, a metal film such as tin, silver, chromium, and aluminum is formed on the surface 24 opposite to the surface on which the light reflecting film surface is formed, and the respective rectangular parallelepiped materials 20 are soldered together, and a joining technique such as brazing. An underlayer for planar bonding may be formed using

  Alternatively, on the surface 24 opposite to the surface on which the light reflecting film surface is formed, a film that absorbs light for the purpose of reducing stray light in an element unnecessary as a reflection type plane-symmetric imaging element is formed. May be. In this case, when the sheet portions 21 and 22 are formed, the surface 24 opposite to the surface on which the light reflecting film surface of one rectangular parallelepiped material 20 is formed and the light reflecting film surface 23 of another rectangular parallelepiped material 20 are brought into close contact with each other. Therefore, the film formed on the surface 24 opposite to the surface on which the light reflecting film surface is formed may be laminated on the light reflecting film 23.

  In the reflection-type plane-symmetric imaging element 19 having such a configuration, as shown in FIG. 6, incident light is reflected on the light reflecting film surface 23 of the sheet portion 22 in the direction of arrow Y1, and the reflected light is in the direction of arrow Y2. Thus, the light is reflected on the light reflecting film surface 23 of the sheet portion 21, and the reflected light travels toward the observer in the direction of the arrow Y3, and is thus reflected twice to create a mirror image.

The angle of the observation direction with respect to the normal line of the reflective surface-symmetric imaging element 19 is θ, and the interval between the parallel mirrors (light reflecting film surfaces) formed on the sheet portions 21 and 22 (= width in the short direction of the rectangular parallelepiped material 20). ) Is W, and when the optical refractive index of the rectangular parallelepiped material 20 constituting each of the sheet portions 21 and 22 is n, the thickness D per sheet portion (that is, the length in the longitudinal direction of the rectangular parallelepiped material 20) is D. Is



It can be expressed as follows. X is the tilt angle of the ray axis with respect to the normal line in the reflective surface-symmetric imaging element 19.

  FIG. 7 shows an optical system of a spatial image display device as another embodiment of the present invention. In this spatial image display device, two flat reflection-type plane-symmetric imaging elements 11 and 12 are arranged substantially in parallel. In this way, even when the reflection type plane symmetric imaging elements 11 and 12 are arranged in parallel, the reflection type plane symmetric imaging element 11 is spatially symmetric with the object 13 in the same manner as in the embodiment of FIG. The reflective image symmetric imaging element 12 forms a real image 13B at a spatial position that is plane-symmetric with the real image 13A. Therefore, the observer can observe the real image 13 </ b> B with the same unevenness as the object 13.

  An optical straight line from the object 13 to the reflective plane-symmetric imaging element 11 and an optical straight line from the reflective plane-symmetric imaging element 11 to the real image 13A intersect at approximately the center of the reflective plane-symmetric imaging element 11, part 2 The reflection-type plane-symmetric imaging element 11 is disposed at an angular position that bisects the angle formed by the two light straight lines.

  Similarly, an optical straight line from the real image 13A to the reflective plane-symmetric imaging element 12 and an optical straight line from the reflective plane-symmetric imaging element 12 to the real image 13B intersect at substantially the center of the reflective plane-symmetric imaging element 12. The reflection-type plane-symmetric imaging element 12 is disposed at an angular position that bisects the angle formed by the two light straight lines.

  FIG. 8 shows an optical system of a spatial image display device as still another embodiment of the present invention. In this spatial image display device, a half mirror 15 is provided in addition to the reflection-type plane-symmetric imaging elements 11 and 12. As shown in FIG. 2, the reflection-type plane-symmetric imaging elements 11 and 12 are arranged so that their flat surfaces are substantially perpendicular to each other. The half mirror 15 passes a part of the output light from the reflective plane-symmetric imaging element 12 and reflects the rest. The light intensity of the reflected light and transmitted light is set by the reflectance of the half mirror, but generally has a relationship of 3: 7 or 1: 1. A real image 13B is formed by the transmitted light of the half mirror 15, and a real image 13C is formed as a reflected image of the real image by the reflected light. The real image 13B and the real image 13C are formed at positions that are symmetric with respect to the half mirror 15. The observer can observe the real image 13C from the position of the eye E shown in FIG. 8 with the same unevenness as the object 13 and at the same time the scenery (background) ahead through the half mirror 15.

  Further, as shown in FIG. 9, a half mirror 15 can be similarly provided in an apparatus in which the reflection-type plane-symmetric imaging elements 11 and 12 are arranged substantially in parallel as shown in FIG. Even in this case, the real image 13C is formed by the reflected light of the half mirror 15, and can be observed on the same line of sight as the background through the half mirror 15.

  When the half mirror 15 is provided as shown in FIGS. 8 and 9, for example, as shown in FIG. 10, the real image 13 </ b> C and the background 16 through the half mirror 15 are viewed on the same line of sight from the eyes E of the observer. can do.

  FIG. 11 shows an example of the appearance of a spatial video display device according to the present invention, and FIG. 12 shows an internal cross section of the device in the front-rear direction. This spatial image display apparatus is an apparatus in which reflection-type plane-symmetric imaging elements 11 and 12 are arranged in parallel. As shown in FIGS. 11 and 12, the housing 31 includes an optical system storage unit 31a on the observer side, An object storage unit 31b connected to the rear part of the optical system storage unit 31a. The optical system storage part 31a has a box shape having an inclined part 32 on the upper surface. The inclined portion 32 is at an angle of approximately 45 degrees with respect to the bottom surface. The reflective plane-symmetric imaging element 12 is exposed and attached to the center of the inclined portion 32. The reflection-type plane-symmetric imaging element 11 is mounted at an angle of approximately 45 degrees in the optical system housing 31a, and the reflection-type plane-symmetric imaging element 11 and the reflection-type plane-symmetric imaging element 12 are parallel to each other. Has been. The object storage unit 31b has a space communicating with the lower part of the optical system storage unit 31a, and an object 13 of a three-dimensional structure is mounted on the table 34. In addition, a lighting device 35 is provided in the object storage unit 31b. The illumination device 35 is made of, for example, an LED, and is provided for illuminating the object 13 on the cradle 34.

  With such a configuration, the real images 13A and 13B about the object 13 are generated, so that the observer observes the real image 13B with the same unevenness as the object 13 from the observation direction shown in FIG. It will be. Note that at least the surface of the inclined portion 32 of the optical system storage portion 31a is dark, including black, so that the viewer can easily see the real image.

  In each of the embodiments described above, the reflection-type plane-symmetric imaging elements 11 and 12 are not limited to the reflection-type plane-symmetric imaging element 19 including the sheet portions 21 and 22 shown in FIG. You may use the thing of the structure comprised.

11, 12, 19 Reflective plane-symmetric imaging element 13 Objects 13A to 13C Real image 15 Half mirrors 21, 22 Sheet portion 31 Housing

Claims (6)

The first and second reflection units are formed of a plate-like structure in which micromirror units having orthogonal first and second light reflecting surfaces are arranged in a matrix, and the incident light is reflected twice by the first and second light reflecting surfaces. A spatial image display device comprising a second reflective plane-symmetric imaging element,
The first reflective plane-symmetric imaging element reflects incident light from an object twice by the first and second light reflecting surfaces, and the first reflective plane-symmetric imaging element is plane-symmetric with the object. Forming a first real image of the object so that
The second reflection-type plane-symmetric imaging element reflects the incident light from the first real image twice by the first and second light-reflection surfaces, and the second reflection-type plane-symmetric imaging element Forming a second real image of the object so as to be plane-symmetric with the first real image ;
Each of the first reflection-type plane-symmetric imaging element and the second reflection-type plane-symmetric imaging element has a plurality of longitudinal members having one light reflection surface so that the light reflection surfaces are on the same direction side. The first aggregate and the second aggregate arranged in parallel to each other are overlapped so that their light reflection surfaces intersect, and the light reflection surface of the first aggregate is the first mirror of the micromirror unit. A spatial image display device comprising a light reflecting surface and a light reflecting surface of the second aggregate constituting the second light reflecting surface of the minute mirror unit . 2. The spatial image display device according to claim 1, wherein the first and second reflection type plane-symmetric imaging elements are arranged substantially perpendicularly or parallel to each other. A half mirror that reflects the reflected light of the second reflective surface-symmetric imaging element and forms a third real image of the object so as to be plane-symmetric with the second real image about itself; The spatial image display device according to claim 1 or 2 . The spatial image display device according to claim 1, further comprising an illumination device that illuminates the object. A housing for fixing the first reflection type plane-symmetric imaging element inside, and exposing and fixing the second reflection type plane-symmetric imaging element to the outside;
5. The spatial image display device according to claim 1 , wherein a surface of the exposed portion of the second reflective surface-symmetric imaging element of the housing is darkened. 6. The spatial image display device according to claim 1 , wherein the object is a three-dimensional object.