JP2006085135A - Stereoscopic display system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To view high-resolution, sharp stereoscopic images in any direction, without having to take into account the projecting timing of a two-dimensional image. <P>SOLUTION: In the stereoscopic display system, two polygon mirrors 4a and 4b, each of which is composed of mirrors arranged in a ring shape, are disposed around the rotary shaft of a screen 2. An electronic projector 5 is disposed opposite the mirror faces of the polygon mirrors 4a and 4b and on a line extended from the rotary shaft of the screen 2. The electronic projector 5 emits an image, comprising concentric two frame-image groups G and H, each of which is composed of frame images arranged in a ring shape. The one frame-image group G is reflected by the polygon mirror 4a and projected onto a rotating screen 2. The other frame-image group H is reflected by the polygon mirror 4b and projected onto the rotating screen 2. According to the rotation of the screen 2 rotates, the frame-image groups G and H are projected and displayed onto the screen 2, one frame at a time, in sequence. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a stereoscopic display device that enables a stereoscopic view by allowing different sides of a display target to be viewed when the displayed video is viewed around the periphery.

  A stereoscopic display device has been proposed that displays a stereoscopic image using a rotating screen. As an example, two-dimensional image data of this object is created from three-dimensional image data representing the three-dimensional object when the object is viewed from each direction around the object. When creating the dimensional image data, a hidden surface erasing process that erases the data of the invisible part is performed), which is projected in turn on the rotating screen, but with the change in the orientation of the screen due to the rotation, The two-dimensional image projected on this is sequentially changed. According to this, when the screen is viewed from a certain point, the image displayed on the screen gradually changes by increasing the rotation of the screen. By performing the image display in this way, the projected image on the screen can be seen as a three-dimensional image with a visual afterimage effect (see, for example, Patent Document 1).

  In addition, as in the technique described in Patent Document 1, when a two-dimensional image is projected by rotating a screen so that a three-dimensional image is obtained, if the illuminance distribution of the projected two-dimensional image is uniform, In the image projected on the screen, the illuminance decreases with distance from the rotation axis compared to the rotation axis side of the screen, and the illuminance distribution becomes non-uniform. To prevent this, the illuminance of the projected two-dimensional image A technique has also been proposed in which the distribution is non-uniform and the illuminance distribution of the image projected on the screen is uniform (see, for example, Patent Document 2).

Furthermore, a configuration is used in which a slide image is created by shooting a display target from different viewpoints, and a slide image obtained by shooting from the corresponding viewpoint is projected each time the rotating screen sequentially faces these viewpoints. By increasing the screen rotation speed to about 300 to 600 rotations / minute, an afterimage of the naked eye is induced to form a pseudo three-dimensional image on the screen, or the display object is moved around the periphery. A cylindrical film of the captured image is created by continuously capturing images with a camera that reads the images of the cylindrical film sequentially, and the position of the space is passed through a mirror that rotates in synchronization with the reading of the cylindrical film. This is a technique that creates a three-dimensional space floating image by the afterimage of the naked eye by sufficiently increasing the rotation speed of this mirror. It has also been proposed (e.g., see Patent Document 3).
JP2001-103515 JP 2002-27504 A JP 2002-271820 A

  By the way, since the techniques described in Patent Documents 1 and 2 enable stereoscopic viewing using an afterimage, it is necessary to display slightly different images almost simultaneously. For this purpose, a sufficiently large number of two-dimensional images are required, and it takes a lot of labor and time to create them, and a memory for storing the data of such two-dimensional images is also required. In addition, since it is necessary to rotate the screen at high speed, it is necessary to accurately project a two-dimensional image corresponding to the orientation of the screen onto the screen. Therefore, it is necessary to maintain synchronization with the projection timing with high accuracy.

  Further, the technique described in Patent Document 3 also projects a two-dimensional image read from a cylindrical film at a peripheral spatial position by projecting a two-dimensional slide image on a high-speed rotating screen or by a high-speed rotating mirror. By forming an image, an afterimage of the naked eye acts to make it appear as a three-dimensional image. When projecting this slide image on the screen, as in the techniques described in Patent Documents 1 and 2 above, when the screen faces the above viewpoint, the corresponding slide image can be projected on this screen. Although necessary, since the screen rotates at a high speed, a very high accuracy is required for the timing of projecting the slide image onto the screen.

  In the technique described in Patent Document 3, when a three-dimensional image is displayed using the two-dimensional image read from the cylindrical film, complicated means for the cylindrical film to sequentially read the images is required. In addition, since the image read from the cylindrical film is imaged in space, a clear three-dimensional image can be seen only at this imaging position, and the viewing position is very limited. It will be a thing.

  The present invention has been made in view of the above points, and its purpose is to allow a high-resolution clear stereoscopic image to be viewed from any direction without considering the projection timing of the two-dimensional image. Another object of the present invention is to provide a stereoscopic display device.

  To achieve the above object, the present invention comprises a rotatable screen and a plurality of mirrors arranged in a ring shape along a conical surface having the rotation axis of the screen as a central axis. The first and second mirror groups arranged concentrically about the rotation axis of the screen and the mirror surfaces of the mirrors constituting the first and second mirror groups and representing different side surfaces of the object And an electronic projector disposed at a position where the first and second frame image groups composed of different frame images are separately projected onto the mirror surfaces of the first and second mirrors. , The second mirror group is arranged to project a frame image onto the respective mirror, and the mirrors of the first and second mirror groups are respectively projected from the electronic projector. The group is the mirror surface of the mirror Isa is to be intended to be disposed on the optical path of the optical system is projected on the screen.

  A second mirror group is arranged inside the first mirror group, and each mirror of the first mirror group rotates the respective frame images of the first frame image group emitted from the electronic projector. Projecting onto the same first area of the screen surface, each mirror of the second mirror group rotates the first frame image of the second frame image group emitted from the electronic projector. Is projected onto the same second area different from the above area.

  A second mirror group is arranged inside the first mirror group, and each mirror of the first mirror group displays each frame image of the first frame image group emitted from the electronic projector. Each of the mirrors of the second mirror group projects the respective frame images of the second frame image group emitted from the electronic projector onto the same area of the screen surface, and as the screen rotates, The frame image of the first frame image group by the mirror of the first mirror group and the frame image of the second frame image group by the mirror of the second mirror group are alternately projected on the screen.

  In order to achieve the above object, the present invention is provided with a viewing angle control means, a rotatable screen, and a plurality of mirrors arranged in a ring shape along a conical surface having the rotation axis of the screen as a central axis. The first and second mirror groups arranged concentrically about the rotation axis of the screen and the mirror surfaces of the mirrors constituting the first mirror group, and representing different side surfaces of the object A first electronic projector disposed at a position for projecting a first frame image group composed of frame images onto the mirror surface of the first mirror for each frame image, and a mirror surface of a mirror constituting the second mirror group And a second electronic projector disposed at a position where a second frame image group consisting of different frame images representing different side surfaces of the object is projected onto the mirror surface of the second mirror for each frame image. Have The first mirror group and the second mirror group are arranged separately on the upper and lower sides of the screen so that the mirror surfaces face each other, and the first and second electronic projectors are respectively the first and second mirrors. The first mirror group mirrors are arranged separately above and below the group, and the first frame image group projected from the first electronic projector is reflected on the mirror surface of the mirror and projected onto the screen. The mirrors of the second mirror group are respectively arranged on the optical path of the optical system, and the second frame image group projected from the second electronic projector is reflected on the mirror surface of the mirror and projected onto the screen. It is arranged on the optical path of the optical system.

  Then, each mirror of the first mirror group projects each frame image of the first frame image group emitted from the first electronic projector onto the same first region on the surface of the rotating screen, and Each mirror of the two mirror groups projects each frame image of the second frame image group emitted from the second electronic projector onto the same second area different from the first area on the screen surface. Is.

  Further, the display of the frame image of the first frame image group and the display of the frame image of the second frame image group on the screen can be switched.

  In addition, each mirror of the first mirror group displays each frame image of the first frame image group emitted from the first electronic projector, and each mirror of the second mirror group includes the second mirror Each frame image of the second frame image group emitted from the electronic projector is projected onto the same area of the screen surface, and the first mirror mirror of the first mirror group is rotated as the screen rotates. The frame image of the frame image group and the frame image of the second frame image group by the mirror of the second mirror group are alternately projected onto the screen.

  In order to achieve the above object, the present invention includes a viewing angle control means, a rotatable screen, and a plurality of halves arranged in a ring shape along a conical surface with the rotation axis of the screen as a central axis. Projecting frame images of a frame image group composed of different frame images that are opposed to the half mirror group composed of mirrors and the surfaces of the half mirrors constituting the half mirror group and represent different side surfaces of the object onto the surfaces of the separate half mirrors An electronic projector disposed at a position, and the electronic projector is disposed so as to project a frame image of the frame image group onto each half mirror of the half mirror group, and each of the half mirrors from the electronic projector The frame image of the projected frame image group is arranged on the optical path of the optical system that is reflected by the surface of the half mirror and projected onto the screen. Those configured to be able to see the frame image projected on the screen by.

  In order to achieve the above object, the present invention is provided with a viewing angle control means, a rotatable screen, and a plurality of mirrors arranged in a ring shape along a conical surface having the rotation axis of the screen as a central axis. The first and second half mirror groups arranged concentrically and vertically with respect to the rotation axis of the screen, and facing the surfaces of the half mirrors constituting the first and second half mirror groups, and An electronic projector disposed at a position for separately projecting the first and second frame image groups composed of different frame images representing different side surfaces of the object onto the mirror surfaces of the first and second half mirror groups; The electronic projectors are arranged so that the first and second half mirror groups respectively project the frame images onto the respective half mirrors, and the half mirrors of the first and second half mirror groups are respectively electronic projectors. First, in which the second frame GOP is reflected by the surface of the half mirror disposed on the optical path of the optical system is projected on a screen projected from.

  Then, each her mirror of the first half mirror group displays each frame image of the first frame image group emitted from the electronic projector, and each half mirror of the second half mirror group includes the electronic projector. Each frame image of the second frame image group emitted from the first frame is projected onto the same area of the screen surface, and the first frame by the half mirrors of the first half mirror group as the screen rotates. The frame image of the image group and the frame image of the second frame image group by the half mirror of the second half mirror group are alternately projected on the screen.

  Further, the screen has retroreflectivity, and the frame image projected on the screen of the first frame image group can be seen only through the first half mirror group, and is projected on the screen of the second frame image group. The frame image is configured so that it can be viewed only through the second half mirror group.

  In order to achieve the above object, the present invention is provided with a viewing angle control means, facing a rotatable screen, a concave half mirror centering on the rotation axis of the screen, and a surface of the half mirror. And an electronic projector arranged at a position for projecting the first and second frame image groups composed of different frame images representing different side surfaces of the object onto the surface of the half mirror. , Each of the second half mirror groups is arranged so as to project a frame image onto each half mirror, and the half mirror is configured such that the first and second frame image groups projected from the electronic projector are on the surface of the half mirror. It is arranged on the optical path of the optical system that is reflected and projected onto the screen.

  The screen has retroreflectivity, and the frame image projected on the screen of the first frame image group is viewed through the half mirror only from the direction in which the frame image of the first frame image group is projected on the screen. The frame image projected onto the screen of the second frame image group can be viewed through the half mirror only from the direction in which the frame image of the second frame image group is projected onto the screen. It is.

  The half mirror has a shape of a part of a spheroid, a screen is disposed at one focal position of the spheroid formed by the half mirror, and an electronic projector is disposed at the other focal position.

  According to the present invention, it is not necessary to consider the projection timing of each frame image on the screen, and a plurality of clear stereoscopic images with improved resolution can be obtained simultaneously, and the angular resolution is improved. 3D images can be obtained.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an external perspective view showing the whole of a first embodiment of a stereoscopic display device according to the present invention, wherein 1 is a housing, 1a is a see-through unit, 2 is a screen with viewing angle limiting means, and 3 is a rotation mechanism unit. (Rotation drive source) 4 is a polygon mirror (mirror group).

  In this figure, at least a part of a cylindrical housing 1, that is, a portion of the height of the eyes of the viewer is provided with a see-through portion 1a so that the inside can be seen. In this portion of the body 1, a screen 2 with viewing angle limiting means, a rotating mechanism 3 for rotating the screen, and a polygon mirror 4 are provided. The screen 2 with viewing angle limiting means is rotationally driven by the rotation mechanism unit 3 continuously or stepwise with the central axis of the cylindrical housing 1 as the rotation axis. The polygonal mirror 4 is a conical surface formed of a plurality of mirrors arranged in a ring shape on a circular orbit having the same radius from the central axis of the conical surface with the central axis of the cylindrical housing 1 as the central axis. This is a group of mirrors.

  FIG. 2 is a perspective view showing the internal structure of the embodiment shown in FIG. 1. 4a and 4b are polygon mirrors, 5 is an electronic projector, and parts corresponding to those in FIG. Description to be omitted is omitted.

  In the figure, the polygon mirror 4 is composed of two different polygon mirrors 4a and 4b. The polygon mirror 4a and the polygon mirror 4b are the center of the casing 1 (FIG. 1) of the stereoscopic display device. This is a group of conical surface mirrors composed of a plurality of mirrors arranged in a ring shape on the conical surface centering on the axis as described above. An electronic projector 5 is provided above the screen 2 with viewing angle limiting means in the housing 1 (FIG. 1). The electronic projector 5 uses liquid crystal or the like, and projects an image on the polygonal mirrors 4a and 4b. This image is reflected by the polygon mirrors 4a and 4b and then projected onto the screen 2 with viewing angle limiting means. As shown in FIG. 1, the viewer can see the image projected on the screen 2 with the viewing angle limiting means.

  FIG. 3 shows a specific example of an image projected by the electronic projector 5, and a group of frame images Ga to Gp having the same number as the number of mirrors in the polygonal mirror 4a arranged in a ring shape ( Hereinafter, such a group is referred to as a frame image group G), and one group of frame images Ha to Hh equal in number to the number of mirrors in the polygonal mirror 4b arranged concentrically with the frame image groups Ga to Gp inside. (Hereinafter, such a group is referred to as a frame image group H). These frame images Ga to Gp are images when the same object is viewed from different positions around it. For example, if the frame image Ga is a frame image viewed from the front of this object, the frame image Gi is the image of the same object viewed from directly behind, and the positions of these frame images Ga to Gp on the projection image plane are Corresponds to the position to see the object. These frame images Ga to Gp are respectively reflected by separate mirrors of the polygon mirror 4a and projected onto the screen 2 with viewing angle limiting means. The frame images Ha to Hh are also images when the same object is viewed from different positions around it. Here, these images Ha to Hh are images obtained by viewing the same direction display device from different directions. For example, the frame image Ha shows the display content “west” of the direction display device when the direction display device is viewed from the west direction. In the same manner, the frame image He indicates “east”.

  FIG. 4 is a diagram showing a projection state of the frame image groups G and H shown in FIG. 3 in the embodiment shown in FIG. 2, and the same reference numerals are given to the portions corresponding to the previous drawings, and the duplicated explanation is omitted. .

  In the figure, the frame image group G emitted from the electronic projector 5 is reflected by the polygon mirror 4a and projected onto the screen 2 with viewing angle limiting means, and the frame image group H emitted from the electronic projector 5 is The light is reflected by the polygon mirror 4b and projected onto the screen 2 with viewing angle limiting means. As a result, when the viewer views the screen 2 with viewing angle limiting means, two projected images of the frame image group G and the frame image group H can be viewed.

  FIG. 5 is a diagram schematically showing the system configuration of the first embodiment shown in FIG. 1, wherein 6 is a control unit, 7 is a drive circuit, and 8 is a storage unit. Are given the same reference numerals.

  In the figure, the storage unit 8 stores video data representing the frame image group G of the frame images Ga to Gp and the frame image group H of the frame images Ha to Hh shown in FIG. The control unit 6 controls the drive circuit 7 to drive the rotation mechanism unit 3 to rotate the screen 2 with viewing angle limiting means, and to read out video data from the storage unit 8 and supply it to the electronic projector 5 Then, the image shown in FIG. 3 is projected. The projection image composed of the frame image groups G and H may be arbitrarily created by computer graphics or the like, or may be created by imaging with a CCD camera. Further, when the image is created by imaging with a CCD camera, the creation may be performed at a remote place, and the created video data may be received and stored in the storage unit 8.

  With the above configuration, the control unit 6 reads the video data from the storage unit 8 and supplies it to the electronic projector 5. The electronic projector 5 emits an image shown in FIG. 3 based on the received image data. The emitted frame image group G of this image is reflected by a different mirror of the polygon mirror 4a for each of the frame images Ga to Gp, and is projected onto the screen 2 with viewing angle limiting means. The image group H is reflected by a different mirror of the polygonal mirror 4b for each of the frame images Ha to Hh and projected onto the screen 2 with viewing angle limiting means. Accordingly, as shown in FIG. 6, if the directions of viewing the screen 2 with the viewing angle limiting means from the periphery of the screen 2 with the viewing angle limiting means are a to p, these a (west), b (west northwest), c (Northwest), d (northwest north), e (north), f (northeast north), g (northeast), h (east northeast), i (east), j (east southeast), k (southeast), l (southeast south) ), M (south), n (south-south-west), o (south-south-west), and p (west-south-west) directions are respectively projected onto the screen 2 with viewing angle limiting means, and a, c, e , G, i, l, m, o, respectively, the frame images Ha to Hh are projected onto the screen 2 with viewing angle limiting means.

  As a result, different frame images Ga to Gp and frame images Ha to Hh are displayed on the screen 2 with viewing angle limiting means depending on the direction in which the screen 2 with viewing angle limiting means is viewed from the surroundings, as shown in FIG. Will be displayed. Here, the frame images Ga to Gp are images projected on the screen 2 with viewing angle limiting means when viewed from the directions a to p shown in FIG. 6, for example, viewing angle limiting means from the a (west) direction. When the screen 2 with the viewing angle is viewed, when the surface of the screen 2 with the viewing angle limiting means faces in the direction a, the frame image Ga can be displayed on the screen 2 with the viewing angle limiting means. At the same time, when the surface of the screen 2 with viewing angle limiting means faces in the directions a, c, e, g, i, l, m, and o, the frame images Ha to Hh appear on the surface of the screen 2 with viewing angle limiting means. In these a, c, e, g, i, l, m, and o directions, the frame images Ga and Ha, the frame image groups Gc and Hb, the frame image groups Ge and Hc, and the frame images can be displayed. The group Gg and Hd, the frame image group Gi and He, the frame image group Gk and Hf, the frame image group Gm and Hg, and the frame image group Go and Hh are displayed simultaneously. However, these frame image groups G and H are not only visible when the surface of the screen 2 with viewing angle limiting means faces directly in front, but even if the surface of the screen 2 with viewing angle limiting means is slightly inclined from the front, These frame image groups G and H are visible.

  According to such a configuration, if the screen 2 with viewing angle limiting means is continuously viewed from one direction, for example, the a direction in FIG. 6, when the surface of the screen 2 with viewing angle limiting means faces this a direction, the frame image Ga And Ha are projected onto the screen 2 with the viewing angle limiting means at the same time. For this reason, these frame images can be seen from the a direction. That is, the frame images Ga and Ha are displayed once every time the projection surface of the screen 2 with viewing angle limiting means faces the front. Therefore, in order to make this frame image group G and H, which is one side of the stereoscopic image, not flickering and to be seen as a continuous image, it is left visually by the afterimage of the eye after starting to see the frame image groups G and H. In such a state, the rotation speed of the screen 2 with viewing angle limiting means must be set so that the projection surface of the screen 2 with viewing angle limiting means faces the front and displays the next frame image. In this way, the minimum rotation speed of the screen 2 with viewing angle limiting means is determined.

  8A is a cross-sectional view showing a part of one specific example of the screen 2 with viewing angle limiting means in FIG. 1, FIG. 8B is a perspective view thereof, 9a is a screen plate member, and 9b is Viewing angle limiting filter 10 is a fin.

  In FIGS. 2A and 2B, the screen 2 with viewing angle limiting means is provided with a viewing angle limiting filter 9b composed of a plurality of light-shielding fins 10 on both surfaces of the screen plate member 9a. These fins 10 have, for example, a thickness of about 100 to 200 μm, and are provided with a pixel size on the screen 2 with viewing angle limiting means, for example, with a pitch of about 0.5 to 2 mm. When the screen shown in (2) is projected, the frame image (adjacent frame image) projected by the mirror adjacent to each of the polygonal mirrors 4a and 4b, regardless of which direction the screen 2 with viewing angle limiting means is viewed from. It is shielded so that only the frame image projected by the corresponding mirror in each direction can be seen.

  The viewing angle restriction filter 9b restricts the viewing angle by the fin 10 so that the adjacent frame image cannot be seen. The height of the fin 10 is set according to the viewing restriction angle (visible range). Is done. In addition, a configuration in which a cylindrical lens that condenses light in the viewing angle limiting direction may be arranged.

  As another specific example of the screen 2 with viewing angle limiting means in FIG. 1, a directional reflective screen material as described in JP-A-11-258697 may be used. FIG. 9A is a cross-sectional view showing a screen 2 with viewing angle limiting means using such a directional reflecting screen material, in which 11 is a directional reflecting material screen, and 12 is a viewing angle limiting filter. FIG. 9B is a perspective view showing the configuration of the directional reflector screen 11 in FIG. 9A, in which 11a is a corner mirror sheet and 11b is a lenticular sheet.

  In FIG. 9A, this specific example has a configuration in which a viewing angle limiting filter 12 is provided on the directional reflector screen 11. As shown in FIG. 9B, the directional reflector screen 11 is composed of a corner mirror sheet 11a and a lenticular sheet 11b. Has the characteristic of diffuse reflection, and reflects the incident light in the direction in which the incident angle in the horizontal direction is within ± 45 °. That is, the viewer can view the same image while the directional reflector screen 11 rotates within a range of ± 45 ° to the left and right from the state of facing the viewer watching the screen. Therefore, the screen 2 with viewing angle limiting means using the directional reflector screen 11 has a range of input angles that can be reflected in a predetermined direction as compared with the screen 2 with viewing angle limiting means having the configuration shown in FIG. Since it is wide, the amount of reflected light is large. As a result, a brighter image can be obtained as compared with the case where the screen 2 with viewing angle limiting means having the configuration shown in FIG. 8 is used.

  However, when only the directional reflector screen 11 is used, depending on the incident angle of light, the light may be reflected in a direction different from the incident direction. Frame images from the direction may appear to overlap each other. Therefore, in order to prevent such reflected light from other directions and allow the viewer to see only the frame image corresponding to the direction, as shown in FIG. A limiting filter 12 is also provided. This viewing angle limiting filter 12 has a structure in which fins are arranged at a fine pitch, similarly to the viewing angle limiting filter 9b shown in FIG. For example, by attaching a viewing angle limiting filter (viewing angle limiting optical system) 12 having a viewing angle limit (visible range) of ± about 24 degrees with respect to the normal to the surface of the directional reflector screen 11, As shown in FIG. 10, only the frame image from the correct direction is displayed from the ap direction (FIG. 6) so that only the frame image can be seen from the ap direction (FIG. 6). Become. As a result, if the direction of viewing around the screen 2 with viewing angle limiting means is changed to a, b, c,..., P, the frame images Ga to Gp corresponding to the viewing direction for each viewing direction. And only the frame images Ha to Hh (FIG. 7) can be viewed, and an effect that a plurality of people can enjoy the image simultaneously from an arbitrary direction is obtained. Also, two directional reflector screens 11 are bonded back to back, and a viewing angle limiting filter 12 is bonded to the surface of each directional reflector screen 11 to make a double-sided screen 2 with viewing angle limiting means. be able to. When using the double-sided type screen 2 with viewing angle limiting means, unlike the single-sided type screen 2 with viewing angle limiting means, the image projected from the mirror in two directions during one rotation of the screen is viewed. And you can see a brighter image.

  FIG. 11 is a main part configuration diagram showing a modification of the first embodiment of the stereoscopic display device shown in FIG. 1, and parts corresponding to those in FIG. The system configuration of this modification is as shown in FIG.

  In this figure, in this modification, a frame image of the same object is projected from the electronic projector 5 onto the polygon mirrors 4a and 4b. However, the frame image projected onto the polygon mirror 4a and the frame image projected onto the polygon mirror 4b are slightly different in the viewing direction in the horizontal direction.

  FIG. 12 is a diagram showing a specific example of an image sent from the electronic projector 5 in FIG.

  In FIG. 11, a group of frame images Ga to Gp equal to the number of mirrors in the polygonal mirror 4a arranged in a ring shape in FIG. 11 (hereinafter these are collectively referred to as a frame image group G1), One group of frame images Gab to Gpa equal to the number of mirrors in the polygon mirror 4b in FIG. 11 arranged concentrically with the frame images Ga to Gp on the inside (hereinafter these are collectively referred to as a frame image group G2). ). Here, it is assumed that the polygon mirrors 4a and 4b are composed of the same number (here, 16) of mirrors.

  These frame images Ga to Gp are images when the same object is viewed from different directions around it, like the frame image group G in the image shown in FIG. For example, when the frame image Ga is a frame image viewed from the front of this object, the frame image group Gi is an image of the same object viewed from directly behind, and the positions of these frame images Ga to Gp on the projection image plane are Corresponds to the position to see the object. These frame images Ga to Gp are respectively reflected by separate mirrors of the polygon mirror 4a and projected onto the screen 2 with viewing angle limiting means.

  The frame image group G2 is an image viewed from a direction between viewing directions for two adjacent frame image groups G1. For example, the image of the object viewed from the a direction is the frame image Ga, and the image of the object viewed from the b direction is the frame image group Gb. The image viewed from the direction between the directions a and b is the frame image. Gab. For example, if the frame image Ga of the frame image group G1 is an image viewed from the west direction and the frame image group Gb is an image viewed from the west northwest direction, the frame image Gab is an image from the direction between the west and west northwest. (This is hereinafter referred to as the frame image group G2 is referred to as an image between the frame image groups G1, and conversely, the frame image group G1 is also an image between the frame images).

  In FIG. 11, among the images emitted from the electronic projector 5, the frame image group G1 in FIG. 12 is reflected by different mirrors of the polygonal mirror 4a and projected onto the screen 2 with viewing angle limiting means. The group G2 is reflected by separate mirrors of the polygon mirror 4b and projected onto the screen 2 with viewing angle limiting means. In this case, when the screen 2 with viewing angle limiting means faces the front of the mirror of the polygon mirror 4a, the display position on the screen 2 with viewing angle limiting means of the frame image group G1 onto which this mirror is projected, and the viewing angle When the screen 2 with limiting means faces the front of the mirror of the polygonal mirror 4b, the viewing angle of the frame image group G2 projected by the mirror matches the display position on the screen 2 with viewing angle limiting means. The inclination angles of the polygonal mirrors 4a and 4b with respect to the screen 2 with limiting means are set. Further, the viewing angle of the screen 2 with viewing angle limiting means is also shown in FIGS. 2 and 4 so that the frame image from the polygon mirror 4a and the frame image from the polygon mirror 4b are not overlapped and displayed simultaneously. Compared to the narrower limit.

  For this reason, in this modified example, since the images viewed from different directions of the same object are displayed using the double mirror group, the viewing angle is compared with the embodiment using the images shown in FIG. Just by slightly changing the viewing direction of the screen 2 with the restricting means to the horizontal direction, it changes to the image viewed from that direction, and it becomes possible to view a three-dimensional image with a fine angular resolution in the horizontal direction. .

  FIG. 13 is a diagram showing the horizontal angular resolution of an image by a polygon mirror. FIG. 13A shows the polygon mirror 4a of the screen 2 with viewing angle limiting means when displaying the frame image group G shown in FIG. The viewing angle for each mirror, that is, the horizontal angle resolution when viewed as one full rotation of the screen 2 with viewing angle limiting means is shown. FIG. 12B shows the frame image groups G1 and G2 of the image shown in FIG. The same shows the horizontal angular resolution when displaying. In FIGS. 4A and 4B, the horizontal axis represents the angle in the direction (horizontal direction) of the screen 2 with viewing angle limiting means, and the vertical axis represents the brightness of the projected image.

  Here, compared to the polygon mirror 4a shown in FIG. 13 (a), the mirror of the polygon mirror 4a shown in FIG. 13 (b) is shown narrower, but at each angle of the screen 2 with viewing angle limiting means. On the other hand, in order to represent the range where the projected image can be seen, it is illustrated in this way. Actually, the mirrors of the polygonal mirror 4a shown in FIGS. 13A and 13B can have the same size.

  As described above, in the modification described with reference to FIGS. 11 and 12, compared to the first embodiment described with reference to FIGS. 2 to 4, a three-dimensional image can be displayed in detail when viewed from the horizontal direction. it can.

  As described above, in the first embodiment, a plurality of people can enjoy a stereoscopic image from any direction at the same time, and it is not necessary to adjust each mirror of the polygonal mirror 4, and the position and orientation of the mirror can be adjusted. Errors due to subtle deviations can also be reduced. In addition, since the polygon mirror 4 can be arranged close to the screen 2 with viewing angle limiting means, the entire apparatus can be reduced in size, and a stereoscopic image can be viewed near the screen 2 with viewing angle limiting means.

  Further, since the projected image including all the frame images as shown in FIG. 3 and FIG. 12 can be always emitted from the electronic projector 5, it is not necessary to consider the emission timing for each frame image. The frame image emitted from the projector 5 is projected onto the screen 2 with viewing angle limiting means, and the viewer views the projected frame image, so that a clear stereoscopic image can be viewed from any direction and position. Can do.

  In the above description, the electronic projector 5 is installed above the rotation axis of the screen 2 with viewing angle limiting means to project downward, but the definition of these vertical positions is easy to understand. Therefore, it is used in relation to the rotation axis and the position where the image is formed, and is not limited to the positional relation with the floor or ceiling of the installation location of the stereoscopic display device, for example, May be reversed.

  FIG. 14 is a block diagram showing a second embodiment of the stereoscopic display device according to the present invention. Reference numerals 5a and 5b denote electronic projectors, and parts corresponding to those in the previous drawings are given the same reference numerals and overlapped. Is omitted.

  In the figure, the second embodiment is provided with a polygon mirror 4a on the upper side and a polygon mirror 4b on the lower side, with the screen 2 with viewing angle limiting means interposed therebetween, and this polygon mirror. The electronic projector 5b is provided above the 4a, and the electronic projector 5a is provided below the polygon mirror 4b. As described above, the polygon mirrors 4a and 4b have a ring shape, and are arranged so that the center axis thereof coincides with the rotation center axis of the screen 2 with viewing angle limiting means. Of course, the plurality of mirrors constituting the polygonal mirrors 4a and 4b are arranged on the conical surface as described above.

The image emitted from the lower electronic projector 5a is projected onto the respective mirrors of the polygon mirror 4a through the central opening of the polygon mirror 4b arranged on the lower side, and the image reflected by these images is limited in view angle. It is projected on the screen 2 with means. Similarly, the image emitted from the upper electronic projector 5b is projected onto the respective mirrors of the polygon mirror 4b through the central opening of the polygon mirror 4a disposed on the upper side, and the image reflected by these is projected into the field of view. It is projected on the screen 2 with the angle limiting means.
FIG. 15A shows a specific example of an image emitted from the lower electronic projector 5a in FIG. 14. Like the frame image group G in FIG. It is the image seen from the direction. FIG. 15B shows a specific example of an image emitted from the upper electronic projector 5b in FIG. 14 and, like the frame image group H in FIG. It is.

  FIG. 16 is a diagram showing a state in which the image shown in FIG. 15 is projected in the second embodiment shown in FIG. 14, and parts corresponding to those in FIG.

  In FIG. 15, the frame image group G shown in FIG. 15A emitted from the lower electronic projector 5a is reflected by each mirror of the upper polygonal mirror 4a and projected onto the screen 2 with viewing angle limiting means. Then, the frame image group H shown in FIG. 15B emitted from the upper electronic projector 5b is reflected by each mirror of the upper polygon mirror 4b and projected onto the screen 2 with viewing angle limiting means. Thereby, the frame image group G emitted from the electronic projector 5a above the surface of the screen 2 with viewing angle limiting means is emitted from the electronic projector 5b below the surface of the screen 2 with viewing angle limiting means. Each frame image group H is projected.

  Thus, as in the first embodiment, the 3D image of the object and the image of the direction display are displayed at the same time, and the different side surfaces and directions of the object are changed every time the screen 2 with the viewing angle limiting means is viewed. You can see the information you represent at the same time.

  The second embodiment also has the same external configuration as that shown in FIG. FIG. 17 is a diagram showing a system configuration of the second embodiment, and parts corresponding to those in FIGS. 16 and 5 are given the same reference numerals.

  In the figure, the storage unit 8 stores video data representing the frame video group G shown in FIG. 15A and the video data representing the frame video group H shown in FIG. The control unit 6 controls the drive circuit 7 to drive the rotation mechanism unit 3 to rotate the screen 2 with the viewing angle limiting means, and to read out these video data from the storage unit 8 to obtain the frame video group G. Is supplied to the electronic projector 5a, and video data representing the frame image group H is supplied to the electronic projector 5b. As shown in FIG. 16, the screen image group G, H is displayed on the screen 2 with viewing angle limiting means. Project. The video data representing the frame video group G and the video data representing the frame video group H may be arbitrarily generated by computer graphics or the like, or may be generated by imaging with a CCD camera. Further, when the image is created by imaging with a CCD camera, the creation may be performed at a remote place, and the created video data may be received and stored in the storage unit 8.

  FIG. 18 is a block diagram showing a modified example of the second embodiment shown in FIG. 14. Parts corresponding to those in FIG.

  In this modification, either one of the frame image groups G and H is selectively displayed.

  FIG. 18A shows a case where the frame image group G is displayed. In this case, a frame image group G shown in FIG. 15A is emitted from the electronic projector 5a, and the electronic projector 5b is stopped. The emitted frame image group G is reflected by each mirror of the polygonal mirror 4a and projected onto the screen 2 with viewing angle limiting means. As a result, a 3D image of the object by the frame image group G is displayed on the screen 2 with viewing angle limiting means.

  FIG. 18B shows a case where the frame image group H is displayed. In this case, the frame image group H shown in FIG. 15B is emitted from the electronic projector 5b, and the electronic projector 5a is stopped. The emitted frame image group H is reflected by each mirror of the polygonal mirror 4b and projected onto the screen 2 with viewing angle limiting means. As a result, an image representing the direction is displayed by the frame image group H on the screen 2 with viewing angle limiting means.

  The projection position of the frame image group G in the case of FIG. 18 (a) and the projection position of the frame image group H in the case of FIG. 18 (b) on the screen 2 with viewing angle limiting means may be the same. It may also be different.

  In this modification, the display state shown in FIG. 18A and the display state shown in FIG. 18B may be set according to the installation location of the stereoscopic display device. Regardless of the installation location, the display state shown in FIG. 18 (a) and the display state shown in FIG. 18 (b) may be properly used (for example, when the viewer is separated by a predetermined distance or more) It may function as a direction display device so as to display an image based on the frame image group H, and when approaching within the predetermined distance, a three-dimensional image of an object based on the frame image group G may be displayed.

  FIG. 19 is a block diagram showing another modification of the second embodiment shown in FIG. 14, and parts corresponding to those in FIG.

  In this modification, frame image groups G1 and G2 of the same object are displayed.

  19, the electronic projector 5a emits a frame image group G1 shown in FIG. 20A, and the electronic projector 5a emits a frame image group G2 shown in FIG. 20B. These frame image groups G1 and G2 are obtained from the same object and correspond to the frame image groups G1 and G2 in the image data shown in FIG. 12 used in the modification of the first embodiment. It is.

  The frame image group G1 emitted from the electronic projector 5a is reflected by each mirror of the polygon mirror 4a and projected onto the screen 2 with viewing angle limiting means. Similarly, the frame image group G2 emitted from the electronic projector 5b is reflected by each mirror of the polygonal mirror 4b and projected onto the screen 2 with viewing angle limiting means. The positions and inclinations of the polygon mirrors 4a and 4b are set so that the projection position and size of the frame image group G1 and the projection position of the frame image group G2 on the screen 2 with viewing angle limiting means are equal. Yes.

  The frame image group G1 and the frame image group G2 are polygon mirrors 4a and 4b so as to be alternately projected onto the surface of the screen 2 with the viewing angle limiting unit as the screen 2 with the viewing angle limiting unit rotates. The positional relationship between the mirrors is set, and the positional relationship between the frame image groups G1 and G2 in the video data emitted from the electronic projectors 5a and 5b is set. For example, when the frame image groups G1 and G2 in FIGS. 20A and 20B are projected onto the screen 2 with viewing angle limiting means, the total number of frame images is 16 × 2 = 32, and the viewing angle limiting means Each time the attached screen 2 rotates 360 ° ÷ 32 = 11.25 °, the frame image group G1 and the frame image group G2 are switched and displayed. Therefore, the screen 2 with viewing angle limiting means rotates by 11.25 °. Each time, the mirrors of the polygon mirrors 4a and 4b are arranged so that the surface of the screen 2 with viewing angle limiting means is alternately parallel to the mirror of the polygon mirror 4a and the mirror of the polygon mirror 4b. . In the mirror of the polygon mirror 4b, a frame image group G2 is displayed as an image of the same object viewed from a direction shifted by 11.25 ° with respect to the frame image group G1 reflected by the adjacent polygon mirror 4a. As described above, the electronic projectors 5a and 5b emit the frame image groups G1 and G2.

  In this way, a 3D image similar to the modification of the first embodiment described with reference to FIGS. 11 and 12 is displayed. In the modification shown in FIGS. 19 and 20, FIG. As shown, since the frame image groups G1 and G2 are emitted from the electronic projectors 5a and 5b with the same size, these frame image groups G1 and G2 can be displayed as images of the same resolution. When a 3D image displayed on the screen 2 with viewing angle limiting means is viewed while going around the display device, an image with uniform image quality as a whole can be viewed. In particular, the frame image group G1 is displayed on the entire screen of the electronic projector 5a with respect to the modification of the first embodiment described with reference to FIGS. 11 and 12, and the frame image group G2 is also electronic. By displaying the entire screen of the projector 5b, it is possible to obtain a 3D image with improved image quality as a whole.

  In the above-described second embodiment and its modifications, the electronic projector 5a that emits the frame image groups G and G1 and the electronic projector 5b that emits the frame image groups H and G2 are arranged upside down. You may do it.

  FIG. 21 is a block diagram showing the main part of the third embodiment of the stereoscopic display device according to the present invention, wherein 9 is a polygonal half mirror, and parts corresponding to those in the previous drawings are given the same reference numerals and overlapped. Description to be omitted is omitted.

  In the same figure, this 3rd Embodiment uses the polygon half mirror 9 which consists of the half mirror group of a some half mirror instead of the polygon mirror 4 of previous embodiment. A part of the frame image emitted from the electronic projector 5 is reflected by each half mirror of the polygon half mirror 9 and projected onto the screen 2 with viewing angle limiting means. In this way, as in the previous embodiment, a three-dimensional image based on a frame image is displayed on the surface of the screen 2 with viewing angle limiting means. The viewer can see this through the polygon half mirror 9. it can.

  Here, for example, the electronic projector 5 emits an image including the frame image groups G and H as shown in FIG. 3, and each half mirror of the polygonal half mirror 9 generates the frame image group G in the image. , H are reflected along the same circular locus on the same conical surface (not shown) so as to be reflected and projected onto the screen 2 with viewing angle limiting means.

  FIG. 22 is a diagram showing a system configuration of the third embodiment shown in FIG. 21, and parts corresponding to those in FIGS. 5 and 21 are given the same reference numerals.

  In the figure, the storage unit 8 stores video data representing the frame video groups G and H shown in FIG. The control unit 6 controls the drive circuit 7 to drive the rotation mechanism unit 3 to rotate the screen 2 with viewing angle limiting means, and to read out video data from the storage unit 8 and supply it to the electronic projector 5 Then, the frame image groups G and H are projected on the screen 2 with viewing angle limiting means. The video data representing the frame video groups G and H may be arbitrarily created by computer graphics or the like, or may be created by imaging with a CCD camera. Further, when the image is created by imaging with a CCD camera, the creation may be performed at a remote place, and the created video data may be received and stored in the storage unit 8.

  FIG. 23 is a diagram comparing the first and second embodiments using the previous polygon mirror with the third embodiment using the polygon half mirror shown in FIG. 21 and FIG. S1 and S2 are the line of sight, L is the optical axis, FIG. 23A shows a case where a polygon half mirror is used, and FIG. 23B shows a case where a polygon mirror is used.

  In the case of FIG. 23B using the polygon mirror 4, the image is displayed on the surface of the screen 2 with the viewing angle limiting means so that the viewer deviates the line of sight S 1 and S 2 from the polygon mirror 4. I see. For this reason, the lines of sight S1 and S2 do not coincide with the optical axis L of the light beam of the frame image reflected by the polygon mirror 4 and projected onto the screen 2 with viewing angle limiting means. That is, parallax occurs.

  On the other hand, in the case of the third embodiment shown in FIG. 23A using the polygon half mirror 9, the light of the frame image reflected by the screen 2 with viewing angle limiting means is reflected by the polygon half mirror 9. Therefore, the viewer can see a three-dimensional image displayed on the surface of the screen 2 with viewing angle limiting means through the polygonal half mirror 9. Therefore, when the viewer views this image, the line of sight S is reflected by the polygon half mirror 9 and substantially coincides with the optical axis L of the light beam of the frame image projected on the screen 2 with viewing angle limiting means. Can do. That is, almost no parallax occurs.

  In the case of FIG. 23A, the frame image from the electronic projector 5 is reflected by each half mirror of the polygon half mirror 9 and projected onto the screen 2 with viewing angle limiting means. A pseudo electronic projector 5 exists on an extended line outside the polygonal half mirror 9, and the frame image is emitted from the pseudo electronic projector and projected onto the screen 2 with viewing angle limiting means. However, the fact that the line of sight S of the viewer almost coincides with the light ray L and there is almost no parallax means that the viewer is directed from the direction of the pseudo electronic projector to the surface of the screen 2 with viewing angle limiting means. You are looking at the displayed frame image.

  FIG. 24 is a diagram showing a change in the frame image group G displayed on the surface of the screen 2 with viewing angle limiting means due to the rotation of the screen 2 with viewing angle limiting means.

  FIG. 24A shows the state before and after the state when the screen 2 with viewing angle limiting means rotating with respect to the line of sight S of the viewer faces the front, and viewing angle limiting means indicated by a solid line. The attached screen 2 shows a state before it faces the front, and the screen 2 with viewing angle limiting means shown by a broken line shows a state after it faces the front. The same applies to FIGS. 24B and 24C. FIG. 24 (b) shows changes in the frame image group G displayed on the surface of the screen 2 with viewing angle limiting means when there is almost no parallax as shown in FIG. 23 (a). (C), as shown in FIG. 23 (b), when looking down the surface of the screen 2 with viewing angle limiting means so as to look down with respect to the optical axis L (the line of sight is S1 with respect to the optical axis) The change of the frame image group G displayed on the surface of the screen 2 with viewing angle limiting means is shown.

  As shown in FIG. 23A, when the line of sight S substantially coincides with the optical axis L and there is almost no parallax, the screen 2 with viewing angle limiting means may rotate as shown in FIG. The frame image group G displayed on the surface of the screen 2 with viewing angle restriction means hardly changes in size, position, and shape, and hardly shakes due to the rotation of the screen 2 with viewing angle restriction means.

  On the other hand, as shown in FIG. 23 (b), a frame image group G displayed on the surface of the screen 2 with viewing angle limiting means so that the viewer looks down at the line of sight S1 downward with respect to the optical axis L. When viewing, as shown in FIG. 24 (c), the frame image group G displayed on the screen 2 with viewing angle limiting means appears to change in shape, and is due to the rotation of the screen 2 with viewing angle limiting means. Blur will appear.

  FIG. 25 is a diagram showing how the frame image is seen when there is no parallax and when the line of sight is shifted in the horizontal direction from the optical axis L. FIG. 25 (a) shows the screen 2 with viewing angle limiting means. Is shown when the screen faces the front of the pseudo electronic projector 5 ′, and FIG. 5B shows the screen 2 with viewing angle limiting means rotated more than that.

  When the viewer P has almost no parallax when viewing the surface of the screen 2 with viewing angle limiting means from the direction of the pseudo electronic projector 5 ′, as shown in FIGS. Even if the surface of the screen 2 with the limiting means faces the front of the observer P or rotates and becomes inclined, the frame image group G seen by the observer P does not change in size and shape, and the frame image No blurring occurs in group G. On the other hand, the screen 2 with the viewing angle limiting means in the same state can be seen even when the screen 2 is shifted in the horizontal direction within a certain range from the position of the supervisor P. Since the viewer P ′ has the line of sight S ′ tilted in the horizontal direction with respect to the optical axis L, the frame image group G ′ displayed on the surface of the screen 2 with viewing angle limiting means viewed by the monitor P ′ is The shape changes according to the rotation of the screen 2 with viewing angle limiting means, and blurring occurs with the rotation of the screen 2 with viewing angle limiting means.

  Thus, in the third embodiment, since the frame image displayed on the surface of the screen 2 with the viewing angle limiting means can be viewed through the polygon half mirror 9, the screen 2 with the viewing angle limiting means rotates. Even so, this frame image can be viewed so that no blurring occurs.

  The third embodiment also has the external configuration shown in FIG.

  FIG. 26 is a block diagram showing the main part of the fourth embodiment of the stereoscopic display device according to the present invention, wherein 9a and 9b are polygon half mirrors, and parts corresponding to the previous drawings are given the same reference numerals. Therefore, duplicate explanations are omitted.

  In the same figure, this 4th Embodiment arrange | positions two polygon half mirrors 9a and 9b up and down concentrically. Each of these polygonal half mirrors 9a and 9b is composed of a half mirror group of a plurality of half mirrors. The electronic projector 5 emits images including frame images for two sets of the same object, and one of the frame images is reflected by each half mirror of the polygonal half mirror 9a and projected onto the screen 2 with viewing angle limiting means. The other frame image is reflected by each half mirror of the polygon half mirror 9b and projected onto the screen 2 with viewing angle limiting means.

  FIG. 27 is a diagram showing the projected state and how to view the frame image of the viewer. As shown in FIG. 28, the electronic projector 5 emits an image including two sets of frame image groups G1 and G2. To do. Here, the frame image group G1 is an image when viewed from each direction around the object, and the frame image group G2 is an image when the upper side of the frame image group G1 of the same object is viewed from each direction around the object. It is a picture. The number of frames in the frame image groups G1 and G2 may be the same or different.

  In FIG. 27, the frame image group G1 emitted from the electronic projector 5 is reflected by each half mirror of the polygonal half mirror 9a, projected onto the screen 2 with viewing angle limiting means, and emitted from the electronic projector 5. The frame image group G2 is also reflected by the respective half mirrors of the polygon half mirror 9b and projected onto the same position as the projection position of the frame image group G1 on the screen 2 with viewing angle limiting means.

  Here, in the frame image group G1 reflected by the respective half mirrors of the polygon half mirror 9a and projected onto the screen 2 with viewing angle limiting means, the projection light La is reflected in the projection direction, and the polygon half mirror The projection light Lb is reflected in the projection direction of the frame image group G2 reflected by the half mirrors 9b and projected onto the screen 2 with viewing angle limiting means. For this reason, these frame image groups G1 and G2 are viewed through the polygon half mirrors 9a and 9b, respectively, but the frame image group G1 displayed on the surface of the screen 2 with viewing angle limiting means has a line of sight. When only the viewer Pa viewing from a direction substantially coincident with the projection light La of the group G1 can be seen, and the viewer Pb views the screen 2 with viewing angle limiting means through the polygon half mirror 9b. Since the line of sight of the viewer Pb is greatly deviated from the projection light La of the frame image group G1, the frame image group G1 cannot be seen. Further, the frame image group G2 displayed on the surface of the screen 2 with viewing angle limiting means can only be viewed by the viewer Pb viewing from a direction in which the line of sight substantially coincides with the projection light Lb of the frame image group G2, When the viewer Pa views the screen 2 with viewing angle limiting means via the polygon half mirror 9a, the line of sight of the viewer Pa is greatly deviated from the projection light Lb of the frame image group G2. The frame image group G2 cannot be seen.

  On the other hand, the viewer Pa can view a side image around the object in a three-dimensional manner in the frame image group G1 by viewing the screen 2 with viewing angle limiting means through the polygon half mirror 9a. However, when viewing the screen 2 with viewing angle limiting means through the polygonal half mirror 9a, the image of the same object viewed from above the side surface of the frame image group G1 is stereoscopically displayed in the frame image group G2. Can be seen in

  In this way, in the fourth embodiment, the side surface around the horizontal direction of the stereoscopic image can be seen, and a part of the side surface in the vertical direction can also be seen.

  FIG. 29 is a diagram showing a system configuration of the fourth embodiment shown in FIGS. 26 to 28, and the same reference numerals are given to portions corresponding to FIGS. 5 and 26 to 28.

  In the figure, the storage unit 8 stores video data representing the frame video groups G1 and G2 shown in FIG. The control unit 6 controls the drive circuit 7 to drive the rotation mechanism unit 3 to rotate the screen 2 with viewing angle limiting means, and also reads out this video data from the storage unit 8 to the electronic projector 5. Then, the frame image groups G1 and G2 are projected on the screen 2 with viewing angle limiting means. The video data representing the frame video groups G1 and G2 may be arbitrarily generated by computer graphics or the like, or may be generated by imaging with a CCD camera. Further, when the image is created by imaging with a CCD camera, the creation may be performed at a remote place, and the created video data may be received and stored in the storage unit 8.

  FIG. 30 is a block diagram showing a specific example of the screen 2 with viewing angle limiting means in FIGS. 26, 27, and 29. FIG. 30 (a) is a sectional view thereof, 2a is a screen structure, and 2b. Is a retroreflective mirror, and 2c is a diffusion angle control filter.

  In the screen 2 with viewing angle limiting means, as shown in FIG. 30A, a sheet-like retroreflective mirror 2b is laminated on the screen structure 2a, and a sheet-like diffusion angle limiting filter 2c is provided on the retroreflective mirror 2b. Are stacked. Here, the retroreflective mirror 2b and the diffusion angle limiting filter 2c are laminated on both surfaces of the screen structure 2a, but they may be laminated only on one surface.

  As shown in FIG. 30 (b), the retroreflective mirror 2b connects the cubes by sides, and at any place, each surface of the three cubes, that is, the upper surface of the lower cube and this It is a sheet-like shape in which a pair of reflective surfaces are formed on the three sides of the two cubes connected to the two upper sides of the cube, and the reflection of traffic signs and safety equipment. It is used for plates.

  In the retroreflective mirror 2b, as shown in FIG. 30 (c), incident light is reflected by the one set of reflecting surfaces, so that the incident angle is within a certain angle along the incident direction. Will be reflected. Thereby, in the screen 2 with a viewing angle limiting means, as demonstrated in FIG. 27, projection light La, Lb is each reflected along the incident direction.

  The diffusion angle limiting filter 2c in FIG. 30A is an aggregate of very fine lenses as shown in FIG. 30D, and limits the diffusion angle by the curvature of these lenses.

  FIG. 31 is a block diagram showing a main part of a fifth embodiment of the stereoscopic display device according to the present invention. Reference numeral 10 denotes a concave half mirror, and parts corresponding to those in the previous drawings are given the same reference numerals and overlapped. Description to be omitted is omitted.

  In the same figure, this 5th Embodiment arrange | positions the concave shape half mirror 10 which consists of one part, such as a spherical surface and an ellipse. The electronic projector 5 emits an image including a frame image group for two sets of the same object, and the frame image group is reflected by the concave half mirror 10 and projected onto the screen 2 with viewing angle limiting means.

  FIG. 32 is a diagram showing the projection state and how to view the frame image of the viewer. As shown in FIG. 33, the electronic projector 5 emits an image including two sets of frame image groups G1 and G2. To do. Here, similarly to the image shown in FIG. 28, the frame image group G1 is an image when viewed from various directions around the object, and the frame image group G2 is rotated around the upper side of the frame image group G1 of the same object. It is an image when viewed from each direction. The number of frames in the frame image groups G1 and G2 may be the same or different.

  In FIG. 32, a frame image group G1 emitted from the electronic projector 5 is reflected by the concave half mirror 10 and projected onto the screen 2 with viewing angle limiting means, and the frame image group G2 emitted from the electronic projector 5 is displayed. Also, it is reflected at a location different from the frame image of the concave half mirror 10 and is projected at substantially the same position as the projection position of the frame image group G1 of the screen 2 with viewing angle limiting means.

  Here, the screen 2 with viewing angle limiting means has retroreflectivity as described in FIG. Therefore, the frame image group G1 reflected by the concave half mirror and projected on the screen 2 with the viewing angle limiting means reflects the projection light La in the projection direction and reflects by the concave half mirror 10 and the viewing angle. The frame image group G2 projected on the screen 2 with the limiting means also reflects the projection light Lb in the projection direction. For this reason, these frame image groups G1 and G2 are viewed through the concave half mirror 10, respectively, but the frame image group G1 displayed on the surface of the screen 2 with viewing angle limiting means has a line of sight. When the viewer Pa can only see from a direction substantially coincident with the projection light La of the image, and the viewer Pb views the screen 2 with viewing angle limiting means via the concave half mirror 10, this Since the line of sight of the viewer Pb is greatly deviated from the projection light La of the frame image group G1, the frame image group G1 cannot be seen. Further, the frame image group G2 displayed on the surface of the screen 2 with viewing angle limiting means can only be viewed by the viewer Pb viewing from a direction in which the line of sight substantially coincides with the projection light Lb of the frame image group G2, When the viewer Pa views the screen 2 with viewing angle limiting means through the concave half mirror 10, the line of sight of the viewer Pa is greatly deviated from the projection light Lb of the frame image group G2. The frame image group G2 cannot be seen.

  On the other hand, the viewer Pa can view a side image around the object in a three-dimensional manner in the frame image group G1 by viewing the screen 2 with viewing angle limiting means through the concave half mirror 10. However, when the screen 2 with viewing angle limiting means is viewed from above through the concave half mirror 10, the image of the same object viewed from above the side surface by the frame image group G1 is stereoscopically displayed. Can be seen in the frame image group G2.

  In this way, in the fifth embodiment, as in the previous fourth embodiment, it is possible to see the side surface around the horizontal direction of the stereoscopic image, and it is possible to partially see the side surface in the vertical direction. Is.

  FIG. 34 is a diagram showing a system configuration of the fifth embodiment shown in FIGS. 31 and 32. Parts corresponding to those in FIGS. 5, 31 and 32 are denoted by the same reference numerals.

  In the figure, the storage unit 8 stores video data representing the frame video groups G1 and G2 shown in FIG. The control unit 6 controls the drive circuit 7 to drive the rotation mechanism unit 3 to rotate the screen 2 with viewing angle limiting means, and also reads out this video data from the storage unit 8 to the electronic projector 5. Then, the frame image groups G1 and G2 are projected on the screen 2 with viewing angle limiting means. The video data representing the frame video groups G1 and G2 may be arbitrarily generated by computer graphics or the like, or may be generated by imaging with a CCD camera. Further, when the image is created by imaging with a CCD camera, the creation may be performed at a remote place, and the created video data may be received and stored in the storage unit 8.

  It should be noted that the projection position of the frame image group G1 and the projection position of the frame image group G2 on the screen 2 with viewing angle limiting means are matched as much as possible. For this purpose, when the shape of the concave half mirror 10 forms a part of a spherical surface, the radius of the spherical surface and the positional relationship between the screen 2 with viewing angle limiting means and the concave half mirror 10, the concave half mirror 10 and The positional relationship with the electronic projector 5 is set so as to satisfy the projection position conditions of the frame image groups G1 and G2 as much as possible.

  Moreover, the shape of the concave half mirror 10 can be a part of the spheroid. Now, in FIG. 35, when the reflection surface composed of the spheroid 11 is viewed, the projection lens (projection) of the electronic projector 5 is projected to one of the two focal positions F1, F2 of the spheroid 11 at the focal position F1. The frame images G1 and G2 are focused on the screen 2 with viewing angle limiting means) and the center position of the surface of the screen 2 with viewing angle limiting means is positioned at the other focal position F2. Even if the image groups G1 and G2 are reflected at different locations on the spheroid 11, they are projected on the same location on the surface of the screen 2 with viewing angle limiting means. Therefore, in FIG. 32, the projection lens (not shown) of the electronic projector 5 is disposed at one focal position of the spheroid having the concave half mirror 10 as a part, and the viewing angle is disposed at the other focal position. By positioning the center position of the surface of the screen 2 with limiting means, the frame image groups G1 and G2 emitted from the electronic projector 5 can be projected onto the same place on the surface of the screen 2 with viewing angle limiting means.

  In this way, in the fifth embodiment as well, in the same way as in the previous fourth embodiment, it is possible to see the side surface around the horizontal direction of the stereoscopic image and to see a part of the side surface in the vertical direction. In addition, the concave-shaped half mirror 10 can be formed as an integral configuration, without combining the mirrors as in the previous embodiments.

  In addition, when this 5th Embodiment is compared with 4th Embodiment, in 5th Embodiment, as shown in FIG.36 (b) with respect to 4th Embodiment shown in FIG.36 (a), Since there is a light condensing effect, the focus adjustment of the electronic projector 5 is set to a long distance in order to focus the frame image groups G1 and G2 on the screen 2 with viewing angle limiting means.

1 is an external perspective view showing an entire first embodiment of a stereoscopic display device according to the present invention. It is a perspective view which shows the internal structure of 1st Embodiment shown in FIG. 3 is a diagram illustrating a specific example of an image projected by the electronic projector in FIG. 2. It is a figure which shows the projection state of the frame images G and H shown in FIG. 3 in 1st Embodiment shown in FIG. It is a figure which shows schematically the system configuration | structure of 1st Embodiment shown in FIG. It is a figure for demonstrating the direction with respect to the screen with a viewing angle restriction | limiting means in FIG. It is a figure which shows the frame | video for every direction displayed on the screen with a viewing angle restriction | limiting means in FIG. It is explanatory drawing of a specific example of the screen with a viewing angle limiting means in FIG. It is a block diagram which shows the other specific example of the screen with a viewing angle restriction | limiting means in FIG. It is explanatory drawing of a visual field restriction | limiting angle. It is a principal part block diagram which shows the modification of 1st Embodiment shown in FIG. It is a figure which shows an example of the image | video emitted from the electronic projector in FIG. It is a figure which shows the horizontal direction angular resolution of the image | video by the polygon mirror in 1st Embodiment shown in FIG. It is a block diagram which shows 2nd Embodiment of the three-dimensional display apparatus by this invention. It is a figure which shows an example of the image | video emitted from the electronic projector in FIG. It is a figure which shows the state which projected the image | video shown in FIG. 15 in 2nd Embodiment shown in FIG. It is a figure which shows the system configuration | structure of 2nd Embodiment shown in FIG. It is a block diagram which shows the modification of 2nd Embodiment shown in FIG. It is a block diagram which shows the other modification of 2nd Embodiment shown in FIG. FIG. 20 is a diagram showing a frame image emitted from the electronic projector in FIG. 19. It is a block diagram which shows the principal part of 3rd Embodiment of the three-dimensional display apparatus by this invention. It is a figure which shows the system configuration | structure of 3rd Embodiment shown in FIG. It is the figure which contrasted 1st, 2nd embodiment by this invention using a polygon mirror, and 3rd Embodiment by this invention using a polygon half mirror. It is a figure which shows the change of the top frame image displayed on the surface of the screen with a viewing angle restriction means by rotation of the screen with a viewing angle restriction means in 3rd Embodiment shown in FIG. It is a figure which shows the appearance of the top frame image in the case where there is no parallax in the third embodiment shown in FIG. It is a block diagram which shows the principal part of 4th Embodiment of the three-dimensional display apparatus by this invention. It is a figure which shows the projection state in the 4th Embodiment shown in FIG. 26, and how to look at the frame image of a viewer. FIG. 27 is a diagram showing a frame image emitted from the electronic projector in the fourth embodiment shown in FIG. 26. It is a figure which shows the system configuration | structure of 4th Embodiment shown in FIG. It is a block diagram which shows one specific example of the screen with a viewing angle restriction | limiting means in FIG. It is a block diagram which shows the principal part of 5th Embodiment of the three-dimensional display apparatus by this invention. It is a figure which shows the projection state in the 5th Embodiment shown in FIG. 31, and how to look at the frame image of a viewer. FIG. 32 is a diagram illustrating a frame image emitted from the electronic projector according to the fifth embodiment illustrated in FIG. 31. It is a figure which shows the system configuration | structure of 5th Embodiment shown in FIG. FIG. 32 is a diagram showing the positional relationship between a screen with viewing angle limiting means and an electronic projector in the fifth embodiment shown in FIG. 31. It is a figure which compares and shows 4th Embodiment shown in FIG. 26, and 5th Embodiment shown in FIG.

Explanation of symbols

G, G1, G2, Ga, Gb, H Frame image L, La, Lb Projection light S, S1, S2 Line of sight 1 Case 1a Perspective unit 2 Screen with viewing angle limiting means 3 Rotating mechanism 4, 4a, 4b Polygon mirror 5, 5a, 5b Electronic projector 6 Control unit 7 Drive circuit 8 Storage unit 9, 9a, 9b Polygon half mirror 10 Concave surface half mirror

Claims (1)

One screen having a viewing angle control means and rotatable,
A plurality of mirrors arranged in a ring shape along a conical surface having the rotation axis of the screen as a central axis, and a plurality of mirror groups arranged concentrically around the rotation axis of the screen;
A plurality of frame image groups composed of different frame images that are opposed to the mirror surfaces of the mirrors constituting the plurality of mirror groups and that represent different side surfaces of the object are arranged at positions where they are separately projected onto the mirror surfaces of the plurality of mirrors. One electronic projector, and
The electronic projector is arranged to project the frame image on each mirror in each of the plurality of mirror groups,
Each of the mirrors of the plurality of mirror groups is disposed on an optical path of an optical system in which the plurality of frame image groups projected from the electronic projector are reflected by the mirror surface of the mirror and projected onto the screen. 3D display device.

Images