JP2018081138A - Image display unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display unit that enables an observer to easily adjust the position at which an image is formed.SOLUTION: An image display unit comprises: a half mirror 18; an image output device 10 that outputs light toward one surface 18r of the half mirror 18; and a retroreflective member 14 that is arranged between the image output device 10 and half mirror 18, has a plurality of openings 14h through which at least part of the light output from the image output device 10 passes, and reflects back at least part of light mirror-reflected on the one surface 18r of the half mirror 18 toward the half mirror 18.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an image display device provided with a retroreflective member.

  As an image display device that can visually recognize a three-dimensional image without using dedicated glasses, an image display device including a retroreflective member, an image output device, and a half mirror is widely known.

  For example, Patent Document 1 below discloses an imaging optical system that includes a half mirror and a retroreflective element and forms an actual mirror image of a projection object. In this imaging optical system, a part of the light emitted from the projection object is reflected by the half mirror, and at least a part of the reflected light is retroreflected to the half mirror side by the retroreflective element. In this way, at least a part of the light reaching the half mirror is transmitted through the half mirror, and a real mirror image of the projection object is formed at the position of the surface target with respect to the half mirror.

JP 2009-255766 A

  In the conventional image display apparatus such as the imaging optical system disclosed in Patent Document 1, the relative positions of the projection object, the retroreflective member, and the half mirror are fixed. Therefore, it is difficult to appropriately change the position where the image of the projection object is formed.

  SUMMARY An advantage of some aspects of the invention is that it provides an image display device that easily adjusts a position where an image is formed.

  In order to solve the above problems, an image display device of the present invention is disposed between a half mirror, an image output device that outputs light toward one surface of the half mirror, and the image output device and the half mirror. A recursion having a plurality of apertures through which at least a part of the light output from the image output device passes, and retroreflecting at least a part of the light specularly reflected by the one surface of the half mirror toward the half mirror. And a reflecting member.

  In the display device, at least part of the light output from the image output device reaches the half mirror through a plurality of openings provided in the retroreflective member. At least a part of the light reaching the half mirror is specularly reflected by the half mirror. At least a part of the light specularly reflected by the half mirror reaches the retroreflective member, is retroreflected, and reaches the half mirror again. In this way, at least part of the light reaching the half mirror is transmitted through the half mirror, and an image is formed at a predetermined position in the air. In the present invention, “image” includes still images and moving images. The distance from the half mirror at the position where the image is formed as described above is substantially the same as the distance from the image output device to the half mirror. Therefore, in the image display device, the position at which the image is formed can be adjusted only by changing the position of the half mirror or the position of the image output device. As described above, in the image display device, it is easy to adjust the position where the image is formed.

  In the image display device, a light emitting surface of the image output device from which the light is output, the one surface of the half mirror, and a retroreflective member that retroreflects the light specularly reflected by the one surface of the half mirror. The virtual retroreflective surfaces are preferably parallel to each other.

  As will be described in detail later, retroreflection by the retroreflective member is performed by a plurality of retroreflective elements. In the description of the present invention, the “virtual retroreflective surface” means a plane including a part of each of a plurality of retroreflective elements that contribute to the retroreflection of light that is specularly reflected by the half mirror. As described above, the light emitting surface of the image output device, the virtual retroreflecting surface of the retroreflective member, and the light reflecting surface that is one surface of the half mirror are parallel to each other, thereby being output from the light emitting surface and reaching the virtual retroreflective surface. The distance that the light passes through is substantially the same for the light output from any position on the light emitting surface. Therefore, it is possible to suppress variations in the brightness and resolution of the image formed due to the optical path difference of the light output from the light emitting surface.

  The retroreflective member is preferably movable in a direction having a component in a direction orthogonal to the thickness direction.

  Some of the light output from the image output apparatus may be blocked by a portion of the retroreflective member where no opening is formed. Here, by moving the retroreflective member as described above, the position of the opening of the retroreflective member with respect to the light emitting surface of the image output device can be changed continuously. Therefore, when time integration is performed, light output from more portions of the light emitting surface of the image output device can be imaged in the air through the half mirror as described above. That is, it is possible to suppress a shadow from being generated in an image formed by a portion where the opening of the retroreflective member is not formed.

  Moreover, it is preferable that the plurality of openings of the retroreflective member have a slit shape, and a direction in which the retroreflective member can move has a component in a direction perpendicular to the longitudinal direction of the opening in plan view.

  Since the plurality of openings of the retroreflective member have a slit shape, a portion where the opening of the retroreflective member is not formed is formed in parallel with the longitudinal direction of the slit-shaped opening. Here, as described above, the retroreflective member moves in the direction orthogonal to the longitudinal direction of the opening, so that the light output from the light emitting surface of the image output device is blocked by the portion where the opening of the retroreflective member is not formed. It can be suppressed more. Therefore, it is possible to further suppress the occurrence of a shadow in the image formed by the part where the opening of the retroreflective member is not formed.

  In addition, a first polarizing plate is provided between the image output device and the retroreflective member, and transmits polarized light in a direction perpendicular to the polarized light transmitted through the first polarizing plate to the front side of the half mirror. Preferably, a second polarizing plate is provided, and a quarter-wave plate having a plurality of openings overlapping the plurality of openings of the retroreflective member is provided between the retroreflective member and the half mirror.

  By providing the first polarizing plate, the second polarizing plate, and the quarter-wave plate as described above, the light output from the image output device passes through the optical path as follows. First, the light output from the image output device is polarized in a predetermined direction by passing through the first polarizing plate. Thereafter, at least a part of the light passing through the aperture of the retroreflective member among the polarized light passes through the aperture of the quarter-wave plate. Thereafter, a part of the polarized light is specularly reflected by the half mirror and the other part is transmitted through the half mirror. Since the second polarizing plate transmits polarized light in a direction orthogonal to the polarized light transmitted through the first polarizing plate, the polarized light transmitted through the half mirror is suppressed from being transmitted through the second polarizing plate. On the other hand, at least part of the polarized light that is specularly reflected by the half mirror is transmitted through the quarter-wave plate to become circularly polarized light, and is retroreflected by the retroreflective member. The circularly polarized light retroreflected in this way is converted into circularly polarized light in the opposite direction, transmitted again through the quarter-wave plate, and converted into linearly polarized light. This linearly polarized light is polarized in a direction orthogonal to the polarized light that has passed through the first polarizing plate. Therefore, at least a part of the light transmitted through the half mirror among the polarized light is transmitted through the second polarizing plate. As described above, in the image display device having the above-described configuration, light that does not reach the retroreflective member and is transmitted through the half mirror is suppressed from passing through the second polarizing plate, and is then retroreflected by the retroreflective member. At least part of the transmitted light is transmitted through the second polarizing plate. Therefore, it is easy to increase the relative intensity of light that contributes to image formation in the air with respect to other light, and it is easy to make the image formed in the air clear.

  Moreover, it is preferable that the retroreflective member and the quarter wavelength plate are movable in a direction having a component in a direction orthogonal to the thickness direction.

  Part of the light output from the image output device is not intended by being blocked by a portion of the retroreflective member where no opening is formed or passing through a portion of the quarter wavelength plate where no opening is formed. Sometimes it is polarized. Here, the position of the opening of the retroreflective member and the quarter wavelength plate with respect to the light emitting surface of the image output device is changed continuously by moving the retroreflective member and the quarter wavelength plate as described above. Can do. Therefore, when time integration is performed, light output from more portions of the light emitting surface of the image output device can be imaged in the air through the half mirror as described above. That is, it is possible to suppress a shadow from being formed on an image formed by a portion where the opening of the retroreflective member is not formed or a portion where the opening of the quarter wavelength plate is not formed.

  Further, the plurality of openings of the retroreflective member and the quarter-wave plate are slit-shaped, and the movable direction of the retroreflective member and the quarter-wave plate is a longitudinal direction of the opening in a plan view. It is preferable to have a component in a direction orthogonal to

  A portion where the openings of the retroreflective member and the quarter-wave plate are not formed in parallel with the longitudinal direction of the slit-like opening because the plurality of openings of the retroreflective member and the quarter-wave plate are slit-shaped. Is formed. Here, as described above, the retroreflective member and the quarter-wave plate move in the direction orthogonal to the longitudinal direction of the opening, so that the light output from the light emitting surface of the image output device is reflected by the retroreflective member and ¼. It can suppress more that it is interrupted | blocked by the site | part in which the opening of a wavelength plate is not formed. Therefore, it is possible to further suppress the occurrence of shadows in an image formed by a portion where the opening of the retroreflective member is not formed or a portion where the opening of the quarter wavelength plate is not formed.

  As described above, according to the present invention, an image display device that can easily adjust the position where an image is formed is provided.

It is a figure showing roughly the section of the image display device concerning a 1st embodiment of the present invention. It is a figure which shows schematically the top view which looked at the image display apparatus shown in FIG. 1 from the front. It is a figure which shows roughly the cross section of the other site | part of the image display apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows the image display apparatus which concerns on 2nd Embodiment of this invention similarly to FIG. It is a figure which shows the image display apparatus which concerns on a modification similarly to FIG. It is a figure which shows the image display apparatus which concerns on another modification similarly to FIG.

  Hereinafter, a preferred embodiment of a display device according to the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram schematically showing a cross section of an image display device according to a first embodiment of the present invention. FIG. 2 is a diagram schematically showing a plan view of the image display device shown in FIG. 1 as viewed from the front. In FIG. 2, the half mirror and the second polarizing plate shown in FIG. 1 are omitted for easy understanding.

  As shown in FIGS. 1 and 2, the image display device 1 includes an image output device 10, a first polarizing plate 12, a retroreflective member 14, a quarter wavelength plate 16, a half mirror 18, and a second polarizing plate. 20 as a main component.

  The image output device 10 includes a light emitting surface 10f that outputs light constituting an image. The light is output toward one surface of the half mirror 18. As the image output device 10, for example, a liquid crystal display, an LED display, an EL display, a plasma display, a laser display, a CRT, a liquid crystal projector, or the like can be used. Examples of the light source included in the image output apparatus 10 include an incandescent bulb, a fluorescent lamp, a high-intensity discharge lamp (HID), an LED, an EL, and various lasers. The number of image output devices 10 is not particularly limited, and a plurality of image output devices 10 may be provided.

  The half mirror 18 is a plate-like member that specularly reflects a part of incident light and transmits the other part. One surface of the half mirror 18 is a light reflecting surface 18r that specularly reflects light as described above.

  As such a half mirror 18, the glass plate or film which vapor-deposited the metal layer with the thin film, a wire grid polarizing plate, etc. are mentioned, for example. Examples of the metal constituting the metal layer include aluminum, silver, chromium, titanium, tin, nickel, zinc, indium, zirconium, and stainless steel. The metal constituting the metal layer may be an alloy or an oxide. For example, when the glass plate on which a metal layer made of aluminum having a thickness of about 50 nm to 80 nm is deposited is used as the half mirror 18, the light reflecting surface 18r that is the surface of the half mirror 18 on which the metal layer is formed. Both the mirror reflectance and the light transmittance of the half mirror 18 can be about 50%. Examples of commercially available wire grid polarizers that can be used as the half mirror 18 include WGF # 8408 (trade name) manufactured by Asahi Kasei E-Materials.

  The retroreflective member 14 is a plate-like member that is disposed between the image output device 10 and the half mirror 18 and has a plurality of openings 14h that penetrates in the thickness direction. The retroreflective member 14 of the present embodiment is formed so as to have a lattice shape in plan view, thereby forming a plurality of openings 14h. Further, the retroreflective member 14 of the present embodiment includes a sheet-like base material layer 14a and a plurality of retroreflective elements 14b formed on the surface of the base material layer 14a on the image output device 10 side.

  The plurality of retroreflective elements 14b are constituted by, for example, a prismatic retroreflective element such as a triangular pyramidal retroreflective element or a full cube corner retroreflective element, or a bead-type retroreflective element. In the retroreflective member 14 of the present embodiment, the plurality of retroreflective elements 14b are preferably formed on the base material layer 14a without any gaps.

  The triangular pyramidal retroreflective element has three triangular reflecting surfaces that are substantially perpendicular to each other, and these reflecting surfaces share one vertex and one side is shared by adjacent reflecting surfaces. doing. The full cube corner retroreflective element has three quadrangular reflective surfaces that are substantially perpendicular to each other, and these reflective surfaces share one vertex and are adjacent to each other. Share two sides. The light incident on the prism type retroreflective element having these three reflecting surfaces is retroreflected in the direction of the light source by being sequentially reflected on the three reflecting surfaces. In the case of a bead-type retroreflective element, incident light is retroreflected in the direction of the light source by being reflected once.

  When the plurality of retroreflective elements 14b are triangular pyramid type retroreflective elements or full cube corner type retroreflective elements, it is easy to accurately manufacture a mold used when the retroreflective member 14 is manufactured. In addition, a full cube corner retroreflective element generally exhibits a higher retroreflectivity than a triangular pyramid retroreflective element within a range not exceeding a specific incident angle.

  The plurality of retroreflective elements 14b may be total internal reflection type retroreflective elements or specular reflection type retroreflective elements. The internal total reflection type retroreflective element is made of a transparent material, and totally reflects light internally using a refractive index difference between air or the like that contacts the reflection surface of the internal total reflection type retroreflective element and the transparent material. That is, light incident on the reflecting surface constituting the retroreflective element 14b at an angle exceeding the critical angle is retroreflected by total internal reflection three times. The specular reflection type retroreflective element has a specular reflection layer made of metal such as aluminum or silver. Such a specular reflection layer is provided by depositing metal on the surface of the prism type retroreflective element. The thickness of the specular reflection layer is not particularly limited as long as it can sufficiently reflect light, but is, for example, 80 nm to 200 nm. The light incident on the specular reflection type retroreflective element is retroreflected by a total of three specular reflections in the three specular reflection layers. The internal total reflection type retroreflective element can be easily provided with higher retroreflectivity than the specular reflection type retroreflective element.

  The transparent material constituting the plurality of retroreflective elements 14b is preferably a material having a total light transmittance of 30% or more. The total light transmittance is measured using an A light source based on JIS K7105. Suitable examples of the transparent material include inorganic materials such as glass and organic materials such as acrylic resin, polycarbonate, and polyvinyl chloride.

  When the plurality of retroreflective elements 14b are internal total reflection type retroreflective elements, the refractive index of the transparent material is preferably 1.3 or more and 3.0 or less. More preferably, it is 1.45 or more and 1.7 or less. If the refractive index is 1.3 or more, it is suitable for the internal total reflection condition, and the retroreflective performance of the retroreflective member 14 is excellent. Suitable transparent materials are fluororesin (refractive index 1.34 to 1.42), acrylic resin (refractive index 1.49 to 1.50), polycarbonate (refractive index 1.59), polyvinyl chloride (refractive index). 1.54), polystyrene (refractive index 1.59-1.60), polyester (refractive index 1.60), polyurethane (refractive index 1.49), polypropylene (refractive index 1.48), cycloolefin resin (refractive) Rate 1.50 to 1.54) and various inorganic glasses (refractive index 1.43 to 2.14). The transparent material constituting the internal total reflection type retroreflective element has better incident angle characteristics as the refractive index is higher. Since the refractive index is as high as 1.59 and the total light transmittance is as high as 90% or more, polycarbonate is one of the transparent materials suitable for the prism type retroreflective element. The refractive index can be measured based on JIS K7105. In this specification, the refractive index is a value at a wavelength of 589 nm.

  Various additives may be added to the transparent material. As the transparent material constituting the plurality of retroreflective elements 14b, for example, polycarbonate containing a heat stabilizer or a refractive index adjusting agent can be used.

  The retroreflective member 14 is obtained, for example, by allowing the transparent material to flow into a die cut according to the shape of the retroreflective element 14b, melting the transparent material, and solidifying the transparent material.

  The base material layer 14a and the plurality of retroreflective elements 14b may be formed of one type of material or may be formed of a plurality of types of materials. For example, the base material layer 14a and the plurality of retroreflective elements 14b may be combined after being formed by separate members. However, from the viewpoint of suppressing unintentional reflection of light between a plurality of layers constituting the retroreflective member 14, separation between a plurality of layers constituting the retroreflective member 14, and the like, the retroreflective member 14 Are preferably single layers composed of the same composition.

  The quarter-wave plate 16 is a plate-like member that is disposed between the retroreflective member 14 and the half mirror 18 and has a plurality of openings 16h penetrating in the thickness direction. In the front view, the plurality of openings 16 h overlap with the plurality of openings 14 h formed in the retroreflective member 14. Since the quarter-wave plate 16 and the retroreflective member 14 overlap in plan view, the quarter-wave plate 16 appears and the retroreflective member 14 does not appear in FIG. The quarter wavelength plate 16 of the present embodiment is fixed and integrated on the surface of the retroreflective member 14.

  The first polarizing plate 12 is provided between the image output device 10 and the retroreflective member 14 and transmits polarized light in a predetermined direction out of the light output from the image output device 10. The first polarizing plate 12 of the present embodiment is fixed to the light emitting surface 10 f of the image output device 10 and integrated with the image output device 10.

  The second polarizing plate 20 is provided on the front side of the half mirror 18 and transmits polarized light in a direction orthogonal to the polarized light that passes through the first polarizing plate 12. The second polarizing plate 20 of the present embodiment is fixed to the front surface of the half mirror 18 and integrated with the half mirror 18.

  In addition, the position of each of the above-described components constituting the image display device 1 is fixed by being fixed to a not-illustrated table or casing. However, the image output device 10 and the half mirror 18 are preferably fixed so that their relative positions can be changed as appropriate.

  Next, light output from the image output apparatus 10 will be described.

  At least part of the light output from the image output device 10 reaches the half mirror 18 through a plurality of openings 14 h provided in the retroreflective member 14. At least a part of the light reaching the half mirror 18 is specularly reflected by the light reflecting surface 18 r of the half mirror 18. At least part of the light specularly reflected by the half mirror 18 reaches the retroreflective member 14, is retroreflected by the plurality of retroreflective elements 14 b, and reaches the half mirror 18 again. In this way, at least part of the light reaching the half mirror 18 is transmitted through the half mirror 18, and an image F is formed at a predetermined position in the air.

  The distance D1 from the half mirror 18 at the position where the image F is formed as described above is substantially the same as the distance D2 from the image output device 10 to the half mirror 18. Therefore, in the image display device 1, the position at which the image F is formed can be adjusted only by changing the position of the half mirror 18 or the position of the image output device 10. Thus, in the image display device 1, it is easy to adjust the position where the image F is formed. Therefore, for example, when the image output apparatus 10 is moved away from the half mirror 18, the image F moves in a direction approaching the observer 17. By changing the distance between the half mirror 18 and the image output device 10 as described above while the image F is being displayed, it is possible to give the image F a lively feeling. Since the image output device 10 is disposed on the back side of the second polarizing plate 20 and the half mirror 18 as viewed from the observer 17, even if the image output device 10 is moved as described above, the observer 17 It is possible to suppress the movement from being noticeable.

  Further, in the image display device 1 of the present embodiment, the light is reflected by the light emitting surface 10f of the image output device 10 from which light is output, the light reflecting surface 18r of the half mirror 18, and the light reflecting surface 18r of the half mirror 18. The virtual retroreflective surface 14r of the retroreflective member 14 that retroreflects light is parallel to each other. As described above, since the light emitting surface 10f of the image output device 10, the virtual retroreflecting surface 14r of the retroreflective member 14, and the light reflecting surface 18r of the half mirror 18 are parallel to each other, they are output from the light emitting surface 10f and virtually retroreflected. The distance that light travels to reach the surface 14r is substantially the same for light output from any position on the light emitting surface 10f. Therefore, it is possible to suppress variations in luminance and resolution of the image F formed by the optical path difference of the light output from the light emitting surface 10f. In the image display device 1 of the present embodiment, the virtual retroreflective surface 14r is a part of all the retroreflective elements 14b that contribute to the retroreflection of the light that is specularly reflected by the light reflecting surface 18r of the half mirror 18. It is a plane including. In the image display device 1 of the present embodiment, the incident surface 14 i that is the surface on the half mirror 18 side of the retroreflective member 14 is also parallel to the light emitting surface 10 f of the image output device 10 and the light reflecting surface 18 r of the half mirror 18. It is.

  Further, in the image display device 1 of the present embodiment, the first polarizing plate 12, the second polarizing plate 20, and the quarter wavelength plate 16 are provided as described above, thereby outputting from the image output device 10. The light passes through the optical path as follows. In FIG. 1, the example of an optical path is shown with a broken line, and the polarization direction is also shown.

  The light output from the image output device 10 is first polarized in a predetermined direction by passing through the first polarizing plate 12. The light transmitted through the first polarizing plate 12 is, for example, laterally polarized light. Thereafter, at least a part of the light passing through the opening 14 h of the retroreflective member 14 among the polarized light passes through the opening 16 h of the quarter-wave plate 16. Thereafter, a part of the polarized light is specularly reflected by the light reflecting surface 18 r of the half mirror 18 and the other part is transmitted through the half mirror 18. Since the second polarizing plate 20 transmits polarized light in a direction orthogonal to the polarized light transmitted through the first polarizing plate 12, the polarized light transmitted through the half mirror 18 is suppressed from transmitting through the second polarizing plate 20. Is done. On the other hand, at least part of the polarized light that is specularly reflected by the half mirror 18 is transmitted through the quarter-wave plate 16 to be circularly polarized. Thus, the light transmitted through the quarter-wave plate 16 is, for example, right-handed polarized light. The light transmitted through the quarter-wave plate 16 is reflected and retroreflected an odd number of times by the plane constituting the retroreflective element 14b as described above, so that the circularly polarized light incident on the retroreflective element 14b is rotated in the rotational direction. Is the opposite circularly polarized light. Therefore, when the light incident on the retroreflective element 14b is right-handed polarized light, the light retroreflected by the retroreflective element 14b is left-handed polarized light. The circularly polarized light thus retroreflected is transmitted again through the quarter-wave plate 16 to be linearly polarized light. This linearly polarized light is polarized light in a direction orthogonal to the polarized light transmitted through the first polarizing plate 12. Therefore, when the polarized light transmitted through the first polarizing plate 12 is laterally polarized light, the linearly polarized light is longitudinally polarized light. Since the second polarizing plate 20 transmits polarized light in a direction orthogonal to the polarized light transmitted through the first polarizing plate 12, it is retroreflected by the retroreflective element 14b and reaches the half mirror 18 again as described above. At least part of the light that passes through the mirror 18 passes through the second polarizing plate 20. As described above, in the image display device 1, the light that does not reach the retroreflective member 14 and is transmitted through the half mirror 18 is suppressed from passing through the second polarizing plate 20, and is half reflected after being retroreflected by the retroreflective member 14. At least part of the light that passes through the mirror 18 passes through the second polarizing plate 20. Therefore, it becomes easy to increase the relative intensity of the light contributing to the image formation of the image F in the air with respect to other light, and it becomes easy to make the image F formed in the air clear.

  As described above, the light constituting the image F to be imaged passes through the plurality of openings 14 h of the retroreflective member 14 and the plurality of openings 16 h of the quarter-wave plate 16. On the other hand, part of the light output from the image output device 10 is blocked by a portion of the retroreflective member 14 where the opening 14h is not formed, or the opening 16h of the quarter wavelength plate 16 is not formed. There is a case where unintended polarization is caused by passing through the part. Therefore, it is preferable that the retroreflective member 14 and the quarter wavelength plate 16 are movable in a direction having a component in a direction orthogonal to the thickness direction, and the retroreflective member 14 and the quarter wavelength plate 16 are light emitting surfaces 10f. More preferably, it can be moved in a direction parallel to. As the retroreflective member 14 and the quarter wavelength plate 16 move in this manner, the positions of the openings of the retroreflective member 14 and the quarter wavelength plate 16 with respect to the light emitting surface 10f of the image output device 10 are changed over time. Can be made. Therefore, when time integration is performed, light output from more portions of the light emitting surface 10f of the image output device 10 can be imaged in the air through the half mirror 18 as described above. That is, it is possible to prevent the image F from being shaded by a portion where the opening 14h of the retroreflective member 14 is not formed or a portion where the opening 16h of the quarter wavelength plate 16 is not formed.

  For example, by setting the image display device 1 as shown in FIG. 3, the retroreflective member 14 and the quarter wavelength plate 16 can be moved as described above. FIG. 3 is a diagram schematically showing a cross section of another part of the image display device 1 of the present embodiment. As shown in FIG. 3, the retroreflective member 14 and the quarter wavelength plate 16 are formed in a band shape and are arranged so as to pass between two rolls 30 arranged so as to sandwich the image output apparatus 10. The As a result, the band in which the retroreflective member 14 and the quarter-wave plate 16 are integrated is arranged in an annular shape so as to surround the image output apparatus 10. The half mirror 18 and the second polarizing plate 20 are fixed to the support 32 at a position away from the quarter-wave plate 16 by a predetermined distance. When the roll 30 is rotated in the direction indicated by the arrow A in a state where the respective members are arranged in this manner, the retroreflective member 14 and the quarter wavelength plate 16 are relatively moved with respect to the image output apparatus 10 by the arrow B. Move in the direction of. That is, the retroreflective member 14 and the quarter wavelength plate 16 are orthogonal to the thickness direction of the retroreflective member 14 and the quarter wavelength plate 16 at least in a range where the retroreflective member 14 and the quarter wavelength plate 16 overlap with the light emitting surface 10f of the image output device 10. Move in the direction. The movement speed and direction of the retroreflective member 14 and the quarter-wave plate 16 are adjusted by adjusting the rotation speed and rotation direction of the roll 30.

  Such an image display device 1 is used as a so-called three-dimensional image display device. For example, it is suitable for various signboards, information display devices, information input devices, and amusement equipment.

  Further, since the retroreflective member 14 provided in the image display device 1 can be formed thin, the retroreflective member 14 can be bent and used. That is, the retroreflective member 14 can also be applied when the light emitting surface 10f of the image output device 10 is a curved surface or a spherical surface. The thickness of the retroreflective member 14 may be about 150 μm, for example.

  Moreover, in the image display apparatus 1 of this embodiment, since the incident angle of the light which injects into the virtual retroreflection surface 14r can be brought close to zero, it is easy to improve the retroreflectivity by the retroreflection member 14.

(Second Embodiment)
Next, a second embodiment of the present invention will be described in detail with reference to FIG. In addition, about the component which is the same as that of 1st Embodiment, or equivalent, except the case where it demonstrates especially, the same referential mark is attached | subjected and the overlapping description is abbreviate | omitted.

  FIG. 4 is a diagram showing an image display apparatus according to the second embodiment of the present invention in the same manner as FIG.

  The image display device 2 according to the present embodiment is an image display device according to the first embodiment except that the shapes of the plurality of openings 14h of the retroreflective member 14 and the plurality of openings 16h of the quarter-wave plate 16 are slit-like. Same as 1.

  In the image display apparatus 2 of the present embodiment, the direction in which the retroreflective member 14 and the quarter wavelength plate 16 can move is a plurality of openings 14 h of the retroreflective member 14 and the plurality of quarter wavelength plates 16 in plan view. It is preferable to have a component in a direction perpendicular to the longitudinal direction of the opening 16h. Further, the movable direction of the retroreflective member 14 and the quarter wavelength plate 16 is a direction orthogonal to the longitudinal direction of the plurality of openings 14 h of the retroreflective member 14 and the plurality of openings 16 h of the quarter wavelength plate 16. It is more preferable. That is, the direction in which the retroreflective member 14 and the quarter-wave plate 16 can move is more preferably the direction of the arrow C shown in FIG. Since the plurality of openings 14h and 16h of the retroreflective member 14 and the quarter wavelength plate 16 are slit-shaped, the retroreflective member 14 and the quarter wavelength are parallel to the longitudinal direction of the slit-shaped openings 14h and 16h. A portion where the opening of the plate 16 is not formed is formed. Here, as the retroreflective member 14 and the quarter-wave plate 16 move as described above, the light output from the light emitting surface 10f of the image output device 10 is transmitted to the retroreflective member 14 and the quarter-wave plate 16. It can suppress that it is interrupted | blocked by the site | part in which opening 14h, 16h is not formed. Therefore, it is possible to suppress a shadow from being formed on an image formed by a portion where the opening 14h of the retroreflective member 14 is not formed or a portion where the opening 16h of the quarter wavelength plate 16 is not formed.

  As described above, the image display device 2 of the present embodiment in which the retroreflective member 14 and the quarter-wave plate 16 move is suitable for slit animation. When the image display device 2 is applied to slit animation, it is preferable to appropriately adjust the ratio between the width of the openings 14h and 16h and the interval between the adjacent openings 14h and 16h according to the number of frames.

  The present invention has been described above by taking the first and second embodiments as examples, but the present invention is not limited to these. For example, in the description of the above embodiment, the light emitting surface 10f of the image output device 10, the light reflecting surface 18r of the half mirror 18, and the virtual retroreflecting surface 14r of the retroreflective member 14 are described as examples. These planes may be non-parallel to each other. Moreover, the 1st polarizing plate 12, the 2nd polarizing plate 20, and the quarter wavelength plate 16 are not an essential component. When the 1st polarizing plate 12, the 2nd polarizing plate 20, and the quarter wavelength plate 16 are not provided, the frequency | count of reflection in the retroreflection element 14b is not specifically limited. Further, the direction in which the retroreflective member 14 and the quarter wavelength plate 16 are moved is not particularly limited. For example, the retroreflective member 14 and the quarter wavelength plate 16 may move so as to vibrate within a certain range. The retroreflective member 14 and the quarter-wave plate 16 may rotate around an axis perpendicular to the thickness direction. Further, the mechanism for moving the retroreflective member 14 and the quarter-wave plate 16 is not an essential component.

  Moreover, the shape of the opening formed in the retroreflection member 14 and the quarter wave plate 16 is not particularly limited. 5 and 6 show a modification. FIG. 5 is a diagram showing an image display apparatus according to a modification in the same manner as FIG. FIG. 6 is a view showing an image display apparatus according to another modification in the same manner as FIG. In the image display device 1a shown in FIG. 5, the shapes of the openings 14h and 16h formed in the retroreflective member 14 and the quarter-wave plate 16 are triangular. 2, the opening 16h of the quarter-wave plate 16 appears and the opening 14h of the retroreflective member 14 does not appear in FIG. 5, but the shape of the opening 14h is a triangle like the opening 16h. . The triangular pyramidal retroreflective element has a triangular outer shape in plan view. Therefore, when the retroreflective element 14b is a triangular pyramid retroreflective element, the shape of the opening 14h of the retroreflective member 14 is triangular as described above, thereby opening along the shape of the retroreflective element 14b. 14h can be provided. For this reason, it is possible to form the opening 14h while suppressing damage to the retroreflective element 14b. Therefore, it can suppress that the retroreflective property of the retroreflective element 14b which exists especially in the periphery of the opening 14h falls. From the same viewpoint, the shape of the opening 14h of the retroreflective member 14 may be a rhombus or the like. In the image display device 1b shown in FIG. 6, the shapes of the openings 14h and 16h formed in the retroreflective member 14 and the quarter-wave plate 16 are hexagons. 2, the opening 16h of the quarter-wave plate 16 appears and the opening 14h of the retroreflective member 14 does not appear, but the shape of the opening 14h is a hexagon like the opening 16h. is there. The full cube corner retroreflective element has a hexagonal outer shape in plan view. Therefore, when the retroreflective element 14b is a full cube corner type retroreflective element, the shape of the opening 14h of the retroreflective member 14 is hexagonal as described above, thereby following the shape of the retroreflective element 14b. 14h can be provided. For this reason, it is possible to form the opening 14h while suppressing damage to the retroreflective element 14b. Therefore, it can suppress that the retroreflective property of the retroreflective element 14b which exists especially in the periphery of the opening 14h falls.

  As described above, the image display device of the present invention can easily adjust the position where the image is formed. The image display device of the present invention is suitably used for various signboards, information display devices, information input devices, and amusement devices, for example.

1, 1a, 1b, 2 ... image display device 10 ... image output device 12 ... first polarizing plate 14 ... retroreflective member 14h ... aperture 16 ... 1/4 wavelength plate 16h ... Opening 18 ... Half mirror 20 ... Second polarizing plate

Claims (7)

Half mirror,
An image output device that outputs light toward one surface of the half mirror;
The light that is disposed between the image output device and the half mirror, has a plurality of openings through which at least a part of the light output from the image output device passes, and is specularly reflected by the one surface of the half mirror A retroreflective member that retroreflects at least a part of the back to the half mirror side,
An image display device comprising: A light emitting surface of the image output device from which the light is output, the one surface of the half mirror, a virtual retroreflective surface of a retroreflective member that retroreflects the light that is specularly reflected by the one surface of the half mirror, The image display device according to claim 1, wherein are parallel to each other. The image display device according to claim 1, wherein the retroreflective member is movable in a direction having a component in a direction orthogonal to the thickness direction. The plurality of openings of the retroreflective member are slit-shaped,
The image display apparatus according to claim 3, wherein the movable direction of the retroreflective member has a component in a direction orthogonal to the longitudinal direction of the opening in plan view. A first polarizing plate is provided between the image output device and the retroreflective member;
A second polarizing plate that transmits polarized light in a direction orthogonal to the polarized light that transmits the first polarizing plate is provided on the front side of the half mirror,
3. The image according to claim 1, wherein a quarter-wave plate having a plurality of openings overlapping the plurality of openings of the retroreflective member is provided between the retroreflective member and the half mirror. Display device. The image display apparatus according to claim 5, wherein the retroreflective member and the quarter-wave plate are movable in a direction having a component in a direction perpendicular to the thickness direction. The plurality of openings of the retroreflective member and the quarter-wave plate are slit-shaped,
The image display device according to claim 6, wherein the movable direction of the retroreflective member and the quarter-wave plate has a component in a direction orthogonal to the longitudinal direction of the opening in a plan view.

Images