JP6014063B2 - 3D image display apparatus and 3D image display method - Google Patents

Description

The present invention relates to a stereoscopic image display device and a stereoscopic image display method using a corner cube (hereinafter referred to as a cubic corner body) having three surfaces of a legislative body.

Conventionally, as an apparatus and method for displaying a stereoscopic image, a stereoscopic image display apparatus described in Patent Document 1 and an optical imaging apparatus and method described in Patent Document 2 are known. In the technique described in Patent Document 1, a large number of cubic mirrors are arranged in a lattice pattern, and light reflected by one surface of each cubic mirror is reflected by an orthogonal surface of the cubic mirror to form a stereoscopic image as a real image in the space on the opposite side of the display device. Is formed.

In addition, as shown in FIG. 7, the optical imaging device 60 described in Patent Document 2 includes first and second light control members 65 each including a large number of strip-like planar reflecting portions 63 and 64 that are orthogonal to the front and back surfaces. , 66 are arranged so that the plane reflecting portions 63, 64 are orthogonal to each other, and a three-dimensional image 67 arranged on one side of the front and back surfaces is formed as a real image 68 on the other side.

JP 2009-300623 A WO2009 / 131128 publication

However, in the optical imaging device 60 described in Patent Document 2 (the same applies to the display device described in Patent Document 1), the stereoscopic image 67 is arranged obliquely with respect to the front and back surfaces, and light from the stereoscopic image 67 is entered. Since the basic principle is to form the real image 68 obliquely from the front and back surfaces, there is a problem that it is difficult to form a real image of a stereoscopic image on the front (opposite position) of the front and back surfaces of the optical imaging device 60. It was.
Of course, it is possible to change the imaging position by placing a mirror or the like, but there is a problem that the structure becomes complicated and the apparatus itself has a thickness.

The present invention has been made in view of such circumstances, and an object thereof is to provide a stereoscopic image display device and a stereoscopic image display method capable of forming a stereoscopic image (real image) when the apparatus is viewed from the front.

The stereoscopic image display device according to the first invention that meets the above object is characterized in that a light reflecting portion is provided on a light incident side of a retroreflecting material in which cubic corner bodies each having reflected light exits that pass through the front and back are arranged in parallel. And a partially transmissive mirror in which a light transmissive portion is mixed, light from the object reflected by the retroreflecting material through the light transmissive portion is rereflected by the light reflective portion, and externally from the reflected light exit The light was emitted and imaged.

In the stereoscopic image display device according to the first aspect of the present invention, the cubic corner body has three reflecting surfaces (a part of a right-angled isosceles triangle) intersecting at right angles to each other, and the corners of the three reflecting surfaces are on the corner side. A reflected light exit is preferably provided.

In addition, it is preferable that the transmissivity (transmission area area / total area) of the partial transmission mirror is in the range of 30 to 70%. Moreover, although it is preferable that the shape of a light transmissive part and a light reflection part is a polygon (a triangle is included), it may be striped and scattered. The size of one light transmitting portion or light reflecting portion is about 1/1000 to 1/50 (more preferably 1/200 to 1) of the light incident surface (for example, a regular triangular plane) of one cubic corner body. / 50).

In the stereoscopic image display device according to the first aspect of the present invention, it is preferable that the reflected light exit is formed by removing the reflected light exit from a virtual corner of the cubic corner body to a certain height position.

In the stereoscopic image display device according to the first aspect of the present invention, when the cubic corner body has a height relative to the virtual corner portion of the cubic corner body as h, the reflected light exit exits from the virtual corner portion (0. It is preferably formed at a position in the height range of 3 to 0.8) h.

In the stereoscopic image display device according to the first aspect of the present invention, it is preferable that the cubic corner body is made of transparent plastic or glass, and the three reflecting surfaces are mirror-finished.

In the stereoscopic image display method according to the second invention, a cubic corner body having three reflecting surfaces intersecting at right angles to each other, and having a reflected light exit provided on a corner side of the three reflecting surfaces, is connected to the cubic corner body. A three-dimensional image in which a retroreflective material is formed by arranging a plurality of planar shapes in parallel with the axis of the corner body in parallel, and a partially transmissive mirror in which a light reflecting portion and a light transmitting portion are mixed is arranged on the light incident surface of the retroreflective material. Using a display device, light from an object is put into the cubic corner body from the light transmitting portion, retroreflected by the cubic corner body, the retroreflected light is reflected by the light reflecting portion, and the reflected light Light is emitted from the exit to the outside to form an image.

In the stereoscopic image display device and the stereoscopic image display method according to the first and second inventions, for example, light from an object (including a subject and a light source) is reflected in an incident direction by a retroreflecting material, and then a partially transmissive mirror is used again. Therefore, the stereoscopic image (object) placed at the vertical position on one side with respect to the stereoscopic image display device can be formed as a real image at the vertical position on the other side of the stereoscopic image display device.
Here, by using the partial transmission mirror, it is possible to clearly separate the region through which light passes and the region through which light is reflected, as compared with a normal half mirror, which facilitates design and manufacture.

Therefore, the stereoscopic image display apparatus can be viewed from the front and the stereoscopic image can be viewed, and the entire apparatus can be thinned.
In particular, in the present invention, an object (including a virtual image by an electric signal or the like) arranged on the back side of the stereoscopic image display device can be imaged on the surface side of the stereoscopic image display device. Easy to use for other displays.

(A) is a front sectional view of a stereoscopic image display device according to an embodiment of the present invention, and (B) is an enlarged view of arrow KK in FIG. 1 (A). It is a bottom view of the same three-dimensional image display device. (A)-(C) are explanatory drawings of the partial transmission mirror of a respectively different type. (A), (B) is operation | movement explanatory drawing of the same stereoscopic image display apparatus, respectively. It is explanatory drawing of the cubic corner body of the same three-dimensional image display apparatus. It is operation | movement explanatory drawing of the same three-dimensional image display apparatus. It is explanatory drawing of the three-dimensional image display apparatus which concerns on a prior art example.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIGS. 1A, 1B, 2 and 5, the stereoscopic image display apparatus 10 according to the embodiment of the present invention has a large number of reflected light exits 11a with the top portion 11 missing. The cubic corner body 12 has a light control member 13 disposed adjacently without a gap, and a partial transmission mirror 14 provided on the light incident side of the light control member 13. Note that the cubic corner body 12 is called a corner cube, and is generally used as a retroreflector by arranging a large number thereof. The reflected light exit 11a has a structure that allows light to pass through the front and back of the cubic corner body 12.

The cubic corner body 12 is mainly a transparent body made of glass or plastic, and has three orthogonal surfaces (reflection surfaces) 17 to 19 of the cube 16 as shown in FIGS. 4 (A), (B), and FIG. doing. In the three surfaces 17 to 19, the apex 11 of the right isosceles triangle is horizontally cut at a constant height h1 (FIG. 4A). As a result, the cubic corner body 12 has three equilaterally trapezoidal surfaces 17 to 19, an equilateral triangle 23 surrounded by the bases (or ceiling sides) 20 to 22 of the three surfaces 17 to 19, and the three surfaces 17 to 17. 19 and a top plane 24 on the corner side.

In FIG. 5, the following description is given with the corners of the cube 16 being A to H, respectively. When the length of one side (side) of the cube 16 is a and the midpoint of AE is Q, AQ = a / √2, QC = a · √ (3/2), QB = a / √2, cos θ = QB / QC = 1 / √3. Therefore, when the center line m is arranged vertically with respect to the virtual corner portion of the cubic corner body 12 (corner portion B of the cube 16), the inclination θ of each of the surfaces 17 to 19 with respect to the horizontal plane N is arccos (1 / √ 3) ≈ 54.736 degrees.

Since the cubic corner body 12 becomes a regular triangle in plan view when the center line m is vertical, as shown in FIG. 1 (A), the cubic corner bodies 12 are planarized with the axis m parallel. Can be laid without gaps. In this case, at the top of the cubic corner body 12, the top 11 is removed from the corner B at a height h1 as shown in FIG. 4A, and a top plane 24 perpendicular to the center line m is formed. Yes. In this embodiment, the top flat surface 24 becomes the reflected light exit 11a that passes through the front and back surfaces. Further, the outer surfaces 17 to 19 of the cubic corner body 12 are subjected to a mirror surface treatment (not a half mirror, usually by vapor deposition treatment) to form a reflection surface. Accordingly, the light control member 13 functions as a retroreflecting material in which incident light and reflected light are at the same angle (parallel) with respect to horizontal or vertical.

The cut height h1 that forms the top plane 24 is 0.3 to 0.8 times the height h (= BS) with the corner B as a reference when the cubic corner body 12 is erected with the center line m vertical. The height is preferably (more preferably 0.35 to 0.5 times). When the height h1 is increased, the reflection area of the cubic corner body 12 is decreased, and when the height h1 is decreased, the reflected light passing through the reflected light exit 11a is decreased and the amount of light of the formed real image is insufficient.

In this state, since the light incident side of the light control member 13 constituted by the cubic corner bodies 12 arranged in a large number is composed of a regular triangular plane 13a (light incident surface), a partial transmission mirror 14 is formed thereon. Or arrange. One of the partial transmission mirrors 14 is shown in FIG. 1B, and a large number of triangular light transmission portions 14a and triangular light reflection portions 14b are arranged next to each other. The partial transmission mirror 14 is formed by masking the light transmission part 14a, evaporating a white metal such as silver, aluminum, titanium or the like on the non-mask part and then removing the mask.

The length of one side of the light transmission part 14a and the light reflection part 14b is about 1/1000 to 1/50 (more preferably 1/200 to 1/50) of the regular triangular plane 13a.
If the length of one side of the light transmission part 14a and the light reflection part 14b is reduced, manufacturing becomes difficult and light interference occurs. Further, if the length of one side of the light transmitting portion 14a and the light reflecting portion 14b is increased, the image becomes unclear, so it is preferable to set it within an appropriate range. It is not limited to this range.

As a result, light from the object 26 (including a flat or three-dimensional display image) 26 enters the light control member 13 through the light transmission portion 14a of the partial transmission mirror 14 and is reflected at the same angle. Is reflected by the light reflecting portion 14b, exits from the reflected light exit 11a, and forms a real image 27 at a position outside the stereoscopic image display device 10.

FIGS. 3A to 3C show modified examples of the partial transmission mirror 14. FIG. 3A shows a light transmission portion 14c and a light reflection portion d having a rectangular shape, and FIG. 3B shows light transmission. The part 14e and the light reflection part 14f are striped, and (C) is a polygon in which polygons are arranged concentrically to form a light transmission part 14g and a light reflection part 14h.
The minimum dimension of each light transmitting portion and light reflecting portion is preferably about 1/1000 to 1/50 (more preferably 1/200 to 1/50) of the plane 13a.
In this case, the light transmittance of the partial transmission mirror 14 is 50%, but the ratio or shape of the light transmission part and the light reflection part may be changed to 40 to 60%.

In addition, although it is preferable to form a partial transmission mirror directly on the light incident side of the cubic corner body 12, a transparent plate material (including a sheet material and a film) in which light reflecting portions are scattered on the light incident side of the light control member 13 is used. It can also be arranged. A partial transmission mirror is formed on the back surface (in some cases, the front surface) of the transparent plate.
In addition, a mold is formed in a state where a large number of cubic corner bodies 12 are arranged, and a member that connects these light incident surfaces is made transparent to form a partial transmission mirror. The top plane 24 can also be formed by cutting the top (virtual corner) of each cubic corner body 12.

Subsequently, the operation of the stereoscopic image display device 10 will be described, and a stereoscopic image display method according to an embodiment of the present invention will also be described.
As shown in FIGS. 1, 4, and 6, when the object 26 is separated by a certain distance on the front side of the stereoscopic image display apparatus 10 having the above configuration, the light from the object 26 is partially transmitted by the mirror. 14 enters the light control member 13. Since the light control member 13 itself is a retroreflective material, the light is reflected by the retroreflective material in the incident direction through the three surfaces 17 to 19 of the cubic corner body 12 (that is, retroreflected light), It reaches the partially transmissive mirror 14. That is, the light L from the object 26 passes through the light transmission part 14a of the partial transmission mirror 14, 2) reflected at the point P1 of the surface 19, 3) reflected at the point P2 of the surface 18, and 4) the surface 17 Reflected at point P3. The reflected light at the point P3 on the surface 17 is parallel to the light L, is reflected at the point P4 that is the light reflecting portion 14b of the partial transmission mirror 14, and is formed outside through the reflected light exit 11a.

Although a part of the light is transmitted by the light transmission part 14a of the partial transmission mirror 14, the other light is reflected by the light reflection part 14b and passes through the reflected light outlet 11a to the lower side (outside) shown in FIG. (Stereoscopic image) 27 is formed. The real image 27 in this case is theoretically brighter as the reflectance of the light reflecting portion 14b of the partial transmission mirror 14 is higher and the area of the reflected light exit 11a is larger, but when the reflectance of the partial transmission mirror 14 is increased. When the light from the object 26 decreases and the area of the reflected light exit 11a increases, the function of the retroreflecting material decreases. Therefore, the transmittance of the partial transmission mirror 14 is preferably close to 40 to 60%, and the area of the reflected light exit 11a is preferably 20 to 36% of the area of the equilateral triangle 23. The area of the equilateral triangle 23 is proportional to the square of the height h1.

In addition, the cubic corner bodies whose tops are not cut are arranged in a plane with the axes parallel to each other, a light control member is provided, and a half mirror or a partial transmission mirror is provided between the light control member and the object. Is obliquely arranged, the light from the object passes through the half mirror or partial transmission mirror, enters the light control member, performs retroreflection, and is reflected by the half mirror or partial transmission mirror to produce a real image. Although it will be formed, an image is formed at the outer position between the light control member and the object, so that the real image cannot be viewed from the front. Therefore, in the case of the stereoscopic image display device 10 according to the present invention, since the real image can be viewed from the front, the application range is wider.

In the above embodiment, a conventional half mirror can be used instead of the partial transmission mirror. However, in the case of a half mirror, it is difficult to control the transmissivity, and the partial transmission mirror is more uniform. Can produce products.
The present invention is not limited to the above-described embodiment, and the configuration thereof can be changed without changing the gist of the present invention.

10: Stereoscopic image display device, 11: Top portion, 11a: Reflected light exit, 12: Cubic corner body, 13: Light control member, 13a: Plane, 14: Partially transmitting mirror, 14a: Light transmitting portion, 14b: Light reflecting portion , 14c: light transmission part, 14d: light reflection part, 14e: light transmission part, 14f: light reflection part, 14g: light transmission part, 14h: light reflection part, 16: cube, 17-19: surface, 20-22 : Bottom, 23: equilateral triangle, 24: top plane, 26: object, 27: real image

Claims (6)

Provided on the light incident side of the retroreflective material in which cubic corner bodies each having reflected light exits that pass through the front and back are arranged in parallel with each other are provided with a partially transmissive mirror in which a light reflecting portion and a light transmissive portion are mixed. A three-dimensional image display device characterized in that light from an object reflected by the retroreflecting material passes through a part, is re-reflected by the light reflecting part, and is emitted outside from the reflected light outlet to form an image. . The stereoscopic image display device according to claim 1, wherein the cubic corner body includes three reflecting surfaces that intersect at right angles to each other, and the reflected light exit is provided on a corner portion side of the three reflecting surfaces. A three-dimensional image display device. 3. The stereoscopic image display device according to claim 2, wherein the reflected light exit is formed by removing the reflected light exit from a virtual corner portion of the cubic corner body to a certain height position. 4. The stereoscopic image display device according to claim 3, wherein when the cubic corner body has a height with respect to the virtual corner portion of the cubic corner body as h, the reflected light exit extends from the virtual corner portion to (0.3). A stereoscopic image display device formed at a position in a height range of .about.0.8) h. 5. The stereoscopic image display device according to claim 2, wherein the cubic corner body is made of transparent plastic or glass, and the three reflecting surfaces are mirror-finished. Stereoscopic image display device. A plurality of cubic corner bodies having three reflecting surfaces intersecting at right angles and having reflected light exits provided at the corners of the three reflecting surfaces are arranged in a plane with the axial center of the cubic corner bodies parallel. Using a stereoscopic image display device in which a retroreflective material is formed and a partial transmission mirror in which a light reflecting portion and a light transmitting portion are mixed is arranged on the light incident surface of the retroreflecting material, the light transmitting portion is provided in the cubic corner body. The light from the object is put in, retroreflected by the cubic corner body, the retroreflected light is reflected by the light reflecting portion, and emitted from the reflected light outlet to the outside to form an image. 3D image display method.

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