JP2016133577A - Aerial image formation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aerial image formation device that makes an image other than a subject hard to be mixed in a stereoscopic picture.SOLUTION: An aerial image formation device 1 is configured to bring first and second optical panels 2 and 2' formed by having a plurality of optical reflection sections 22 and 22' lined in a stripe manner in an inner part of transparent flat plates 21 and 21' into close contact with each other with the first and second optical panels 2 and 2' overlapped so that the respective optical reflection sections 22 and 22' are mutually vertical, and a thickness T of each of the first and second optical panels 2 and 2' decreases as is away from an optical panel reference line 1a.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an aerial imaging apparatus.

  In recent years, there has been proposed an aerial imaging apparatus that forms an image of a stereoscopic image of a subject in the air on the other side when light from the subject (actual object) is incident from one side. This aerial imaging apparatus uses an aerial imaging optical panel, and a person on the other side appears to have a subject at the position of a stereoscopic image formed by the aerial imaging apparatus.

  FIG. 8 shows an aerial imaging apparatus 101 having a simple structure. This aerial imaging apparatus 101 has a structure basically similar to one described in Patent Documents 1 and 2. The aerial imaging apparatus 101 is configured by superposing first and second optical panels 102 and 102 'for aerial imaging. The first optical panel 102 includes a large number (for example, about 500 to 1500) of thin (for example, about several thousand angstroms) light reflecting portions 122 (for example, about 500 angstroms) inside a transparent flat plate 121 (for example, made of glass). The metal film) is formed perpendicularly to the surface 121a on one side of the transparent flat plate 121 from the surface 121a on the other side, and is striped at a predetermined pitch P (for example, about 0.2 to 3 mm). It is formed side by side. The second optical panel 102 ′ also has a structure having a transparent flat plate 121 ′ and a light reflecting portion 122 ′ similar to the transparent flat plate 121 and the light reflecting portion 122 of the first optical panel 102. In the aerial imaging apparatus 101, the first and second optical panels 102 and 102 'are overlapped and brought into close contact so that the light reflecting portions 122 and 122' are perpendicular to each other. The thickness T of the first and second optical panels 102 and 102 'is a predetermined uniform thickness (for example, about 0.5 to 10 mm). The aerial imaging apparatus 101 reflects light from the subject N incident on one side of the first optical panel 102 by a light reflecting portion 122 (a point indicated by a in FIG. 8) and reflects the reflected light to the second. The light is reflected again by the light reflecting portion 122 ′ (the point indicated by a ′ in FIG. 8) of the optical panel 102 ′ and emitted to the other side of the second optical panel 102 ′ to form a stereoscopic image N ′ in the air. . The formed reflected light travels straight and enters the eyes, so that the stereoscopic image N ′ in the air can be recognized by a person.

  Such an aerial imaging apparatus 101 can be applied to an application medium system such as a digital signage or an aerial touch panel in which a three-dimensional image of the touch panel emerges in the air.

JP 2011-175297 A JP 2013-220981 A

  However, some of the light that has entered the aerial imaging apparatus 101 from the subject N may not be the light that forms the stereoscopic image N ′.

  For example, as shown in FIG. 9, light that forms a stereoscopic image N ′ (indicated by q in the figure) enters the first optical panel 102 from the subject N and corresponds to the refractive index of the transparent flat plate 121. Refracted, reflected once by the light reflecting portion 122 of the first optical panel 102, emitted to the second optical panel 102 ′, and reflected once by the light reflecting portion 122 ′ of the second optical panel 102 ′. And emitted outside the aerial imaging apparatus 101. On the other hand, the light that does not form the stereoscopic image N ′ (indicated by r in the figure) is incident on the first optical panel 102 from the subject N and refracted according to the refractive index of the transparent flat plate 121. Light that is reflected by one light reflecting portion 122 of the first optical panel 102, and that reflected light is reflected again by the adjacent light reflecting portion 122 to form a stereoscopic image N ′ on the second optical panel 102 ′. Is emitted in a different direction, reflected by the light reflecting portion 122 ′ of the second optical panel 102 ′, and emitted outside the aerial imaging apparatus 101. As described above, even if the light is incident on the first optical panel 102 from the subject N, the light reflected twice by the light reflecting portions 122 and 122 of the first optical panel 102 is the light that forms the stereoscopic image N ′. Must not.

  Therefore, in place of the light that does not form the stereoscopic image N ′, light from other than the subject N (indicated by “s” in the figure) enters the stereoscopic image N ′, and is part of the stereoscopic image N ′. An image other than the subject N is mixed.

  In addition, even light that is reflected only once by the light reflecting portion 122 of the first optical panel 102 and is incident on the second optical panel 102 ′ is reflected by the light reflecting portions 122 ′ and 122 ′ of the second optical panel 102 ′. The light reflected twice is not the light that forms the stereoscopic image N ′, similarly to the light reflected twice by the light reflecting portion 122 of the first optical panel 102. Even in such a case, light from other than the subject N enters the stereoscopic video N ′, and an image other than the subject N is mixed in a part of the stereoscopic video N ′.

  The present invention has been made in view of the above reasons, and an object thereof is to provide an aerial imaging apparatus that makes it difficult for an image other than a subject to be mixed.

  In order to achieve the above object, the aerial imaging apparatus according to claim 1 includes a first optical panel and a second optical panel each having a plurality of light reflecting portions arranged in stripes inside a transparent flat plate, respectively. In the aerial imaging apparatus in which the light reflecting portions of the first and second optical panels are superposed and in close contact with each other, the thickness of each of the first and second optical panels decreases as the distance from the optical panel reference line increases. It is characterized by.

  The aerial imaging apparatus according to claim 2 is the aerial imaging apparatus according to claim 1, wherein the optical panel reference line is flat with respect to each light reflecting portion of the first and second optical panels. It is a line segment that forms an angle of 45 degrees when viewed.

  The aerial imaging apparatus according to claim 3 is the aerial imaging apparatus according to claim 1 or 2, wherein each of the first and second optical panels is reduced in thickness so as to have a constant gradient. It is characterized by that.

The aerial imaging apparatus according to claim 4 is the aerial imaging apparatus according to any one of claims 1 to 3, wherein each of the first and second optical panels has a thickness T of a constant. A, pitch P between adjacent light reflecting portions, angle θ with respect to the thickness direction at which light from the object reference point is incident or light is emitted toward the imaging reference point, refractive index n of the transparent plate, And T = A · P / tan (sin ⁻¹ (sin θ / n)).

  An aerial imaging apparatus according to a fifth aspect is the aerial imaging apparatus according to the fourth aspect, wherein the constant A is √2.

  According to the aerial imaging apparatus of the present invention, it is possible to make it difficult for an image other than the subject to be mixed.

FIG. 3 is a three-dimensional view schematically showing an enlarged part in order to explain light reflection in the aerial imaging apparatus according to the embodiment of the present invention. FIG. 2 shows the above-described aerial imaging apparatus, where (a) is a plan view and (b) is a cross-sectional view taken along the line AA. It is a top view for demonstrating the process of the last stage of an aerial imaging device same as the above. It is a top view for demonstrating reflection of the light in an aerial imaging device same as the above. It is sectional drawing for demonstrating reflection of the light in an aerial imaging device same as the above. FIG. 2 is an enlarged view of a portion that reflects light in the above-described aerial imaging apparatus, where (a) is a plan view and (b) is a cross-sectional view taken along line BB. It is sectional drawing cut | disconnected along CC line which expands and shows the part which reflects light in the air imaging device same as the above. FIG. 10 is a three-dimensional view schematically showing a part enlarged to explain light reflection in a conventional aerial imaging apparatus. It is sectional drawing cut | disconnected in the direction orthogonal to the light reflection part of the 1st optical panel for demonstrating the mode of the light which injected into the 1st optical panel in the conventional aerial imaging device.

  Embodiments of the present invention will be described below. As shown in FIG. 1, the aerial imaging apparatus 1 according to the embodiment of the present invention is the same as the aerial imaging apparatus 101 described with reference to FIG. 8. The optical panels 2 and 2 'are overlapped. The first optical panel 2 has a large number (for example, about 500 to 1500) of thin (for example, about several thousand angstroms) light reflecting portions 22 (for example, about 500 to 1500) inside a transparent flat plate 21 (for example, made of glass). A metal film) is formed perpendicularly to the surface 21b on one side of the transparent flat plate 21 from the surface 21b on the other side, and is striped at a predetermined pitch P (for example, about 0.2 to 3 mm). It is formed side by side. The second optical panel 2 ′ also has a structure having a transparent flat plate 21 ′ and a light reflecting portion 22 ′ similar to the transparent flat plate 21 and the light reflecting portion 22 of the first optical panel 2. In the aerial imaging apparatus 1, the first and second optical panels 2, 2 ′ are overlapped and brought into close contact so that the respective light reflecting portions 22, 22 ′ are perpendicular to each other. The aerial imaging apparatus 1 reflects light from the subject N incident on one side of the first optical panel 2 by a light reflecting portion 22 (a point indicated by a in FIG. 1) and reflects the reflected light to a second. The light is reflected again by the light reflecting portion 22 ′ (the point indicated by a ′ in FIG. 1) of the optical panel 2 ′ and emitted to the other side of the second optical panel 2 ′ to form a stereoscopic image N ′ in the air. . The formed reflected light travels straight and enters the eyes, so that the stereoscopic image N ′ in the air can be recognized by a person.

  Each of the first and second optical panels 2 and 2 ′ has a quadrangular shape in plan view as shown in FIG. More specifically, one side of the quadrangle (the lower side in FIG. 2A) is 45 degrees in plan view with respect to the light reflecting portions 22 and 22 ′ of the first and second optical panels 2 and 2 ′. It is a line segment that forms the angle of. One side of this quadrangle becomes an optical panel reference line 1a described later. In the example shown in FIG. 2A, the sides other than the optical panel reference line 1a are also 45 degrees in plan view with respect to the light reflecting portions 22 and 22 ′ of the first and second optical panels 2 and 2 ′. It has become an angle of. In FIG. 2 (a), the light reflecting portion 22 is lowered to the right and the light reflecting portion 22 'is lowered to the left.

  Such first and second optical panels 2 and 2 ′ cut off the four sides of the quadrangle shown by the broken lines in the drawing in the large optical panels 2A and 2A ′ in close contact with each other as shown in FIG. Accordingly, the four sides can form an angle of 45 degrees in plan view with respect to the light reflecting portions 22 and 22 ′ of the first and second optical panels 2 and 2 ′. Since the manufacturing method up to the optical panels 2A and 2A 'is not the gist of the present application, a description thereof is omitted, but details are described in Patent Document 2 and the like.

  In each of the first and second optical panels 2, 2 ′, the thickness T decreases with a constant gradient as the distance from the optical panel reference line 1 a is increased as shown in FIG.

The thickness T is calculated from the following equation.
T = A · P / tan (sin ⁻¹ (sin θ / n))
Here, A is a constant, specifically, √2 (square root of 2), P is a pitch (distance between centers) between adjacent light reflecting portions 22, 22 or 22 ′, 22 ′, and n is a transparent flat plate 21 and 21 '(refractive index with respect to air). θ is an angle with respect to the thickness direction at which light from the object reference point 1b (a point representing the object N) is incident for the first optical panel 2, and an imaging reference point for the second optical panel 2 ′. This is an angle with respect to the thickness direction at which light is emitted toward 1b ′ (a point at which light from the subject reference point 1b is imaged).

  As shown in FIGS. 4 and 5, the first and second optical panels 2 and 2 ′ have a thickness T that satisfies the above equation. As shown in FIGS. In principle, all the light incident perpendicularly (to the direction) can be reflected and imaged at the imaging reference point 1b ′. That is, as shown in FIG. 6A from the subject reference point 1b, between the adjacent light reflecting portions 22a and 22b of the first optical panel 2, they are flat with respect to the light reflecting portions 22a and 22b. All the light incident at an angle of 45 degrees (in the plane direction) when viewed is reflected by the light reflecting portion 22b, and all the reflected light is reflected by the light reflecting portion 22b 'or 22c' of the second optical panel 2 '. Then, it can be reflected again to form an image on the imaging reference point 1b ′. Details of this are given below.

FIG. 6B is a cross-sectional view taken along a cutting line indicated by BB in FIG. 6A (the incident direction of light in plan view). FIG. 7 is a cross-sectional view taken along a cutting line indicated by CC (a direction perpendicular to the light reflecting portion 22 of the first optical panel 2). The angle θ with respect to the thickness direction, as shown in FIG. 6B, the side closest to the subject reference point 1b between the adjacent light reflecting portions 22a and 22b of the first optical panel 2 (the light reflecting portion 22a). The light (indicated by u in the figure) incident on the side in contact with the first optical panel 2 (transparent flat plate 21) at an angle φ (= sin ⁻¹ (sin θ / n)) is a light reflecting portion 22b. A · P (= √2 · P) in the plane direction, T (= A · P / tan (sin ⁻¹ (sin θ / n))) in the thickness direction, and the light reflecting portion 22b And is emitted to the second optical panel 2 ′. Further, light (indicated by v in the figure) incident on the side farthest from the subject reference point 1b (the side in contact with the light reflecting portion 22b) is reflected by the light reflecting portion 22b at an angle φ with respect to the thickness direction. Then, the light travels in the optical panel 2 (transparent flat plate 21) (see FIG. 7) and is emitted to the second optical panel 2 ′. Therefore, all the light (indicated by u, v, q, and r in the figure) incident between the adjacent light reflecting portions 22a and 22b of the first optical panel 2 is reflected only once by the light reflecting portion 22b. However, it is not reflected by other light reflecting portions 22 such as the light reflecting portion 22a.

  The light emitted from between the adjacent light reflecting portions 22a and 22b of the first optical panel 2 is between the adjacent light reflecting portions 22a 'and 22b' of the second optical panel 2 'or adjacent light reflecting portions 22b. Between ', 22c', it is incident at an angle of φ with respect to the thickness direction. The light incident on the second optical panel 2 ′ is reflected only once by the light reflecting portion 22b ′ or the light reflecting portion 22c ′ in the same manner as the first optical panel 2, and is outside the air panel 2 ′ (in the air). It is emitted at an angle θ to the outside of the imaging device 1 (see FIG. 6B).

  In this way, the aerial imaging apparatus 1 reflects in principle all light incident perpendicularly in the plane direction from the subject reference point 1b to the optical panel reference line 1a and forms an image on the imaging reference point 1b ′. be able to. As a result, the subject N is present near the subject reference point 1b and the stereoscopic image of the image formation reference point 1b ′ and its vicinity from a position where the line of sight is substantially perpendicular to the optical panel reference line 1a in plan view. When N ′ is viewed, it is difficult for an image other than the subject N to be mixed into the stereoscopic video N ′.

  The constant A can be other than √2. For example, it is possible to set the constant A so as to obtain an appropriate stereoscopic image N ′ in conformity with an assumed line of sight.

  Further, the optical panel reference line 1a may be on the inner side rather than on one side of the first and second optical panels 2, 2 '. For example, the optical panels 2A and 2A ′ shown in FIG. 3 are defined as the first and second optical panels 2 and 2 ′, and the lower side of the quadrangle substantially indicated by the broken line in the drawing is used as the optical panel reference. It can be the line 1a. In this case, the outer side of the quadrangle indicated by the broken line in the figure may be a gradient matched to the inner side of the quadrangle.

  As described above, the aerial imaging apparatus according to the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications within the scope of the matters described in the claims. Design changes are possible. For example, even if the gradient that decreases as the thickness T moves away from the optical panel reference line 1a is not calculated from the above-described equation, a certain degree of effect can be obtained with respect to the above-described mixing as long as it approximates it.

DESCRIPTION OF SYMBOLS 1 Aerial imaging device 1a Optical panel reference line 1b Subject reference point 1b 'Imaging reference point 2 1st optical panel 2' 2nd optical panel 21, 21 'Transparent flat plate 22, 22' Light reflection part T 1st or Thickness of second optical panel P Pitch between adjacent light reflecting portions in first or second optical panel

Claims (5)

An aerial in which a first optical panel and a second optical panel, in which a large number of light reflecting portions are arranged in a stripe pattern inside a transparent flat plate, are stacked and adhered so that the light reflecting portions are perpendicular to each other. In the imaging device,
Each of the first and second optical panels has a thickness that decreases with increasing distance from the optical panel reference line. The aerial imaging device according to claim 1,
The aerial imaging apparatus, wherein the optical panel reference line is a line segment that forms an angle of 45 degrees in plan view with respect to the light reflecting portions of the first and second optical panels. The aerial imaging device according to claim 1 or 2,
Each of the first and second optical panels has an aerial imaging apparatus characterized in that the thickness decreases so as to have a constant gradient. The aerial imaging device according to any one of claims 1 to 3,
Each of the first and second optical panels has a thickness T of a constant A, a pitch P between adjacent light reflecting portions, light incident from a subject reference point, or light toward an imaging reference point. Using the angle θ with respect to the thickness direction that emits light and the refractive index n of the transparent flat plate,
T = A · P / tan (sin ⁻¹ (sin θ / n))
An aerial imaging apparatus characterized by being calculated from The aerial imaging device according to claim 4,
The aerial imaging apparatus, wherein the constant A is √2.

Images