JP2018040962A - Optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical device capable of preventing para-images from being visually recognized.SOLUTION: An optical device comprises a reflector array optical element 1 and a surface light emitter 2 disposed facing a rear face or front face of the reflector array optical element 1. The reflector array optical element 1 includes a first reflective plate 11 having a plurality of parallelly arranged first reflective surfaces stacked with a second reflective plate 12 having a plurality of parallelly arranged second reflective surfaces in such a way that the first reflective surfaces and the second reflective surfaces are perpendicular to each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an optical apparatus including a reflector array optical element that forms an aerial image.

  The reflector array optical element includes a first reflection plate having a plurality of first reflection surfaces arranged in parallel, and a second reflection plate having a plurality of second reflection surfaces arranged in parallel, and these plates However, the 1st reflective surface and the 2nd reflective surface are distribute | arranged perpendicularly | vertically, and are piled up (for example, refer patent document 1).

  The reflector array optical element forms an aerial image on the front side by sequentially reflecting image light incident from the back side by the first reflection plate and the second reflection plate. Such aerial image formation is expected to be applied to various fields as a new image display method.

JP 2012-14194 A

  However, in the reflector array element described in Patent Document 1, the first reflecting surface and the second reflecting surface are configured by a mirror surface formed of a metal layer. Sub-images such as a secondary reflection image and a multiple reflection image are formed. Here, the primary reflection image is an image formed by light reflected by only one of the first reflection plate and the second reflection plate, and the multiple reflection image is from light forming an aerial image. Is an image formed by light reflected many times. Such a sub-image may be viewed by a third party other than the user from a position different from a predetermined position where the aerial image can be viewed. For this reason, the content of the aerial image is exposed to a third party through the sub-image, which may cause a problem of reducing the security. Another problem is that when the user visually recognizes the aerial image, a sub-image other than the aerial image that is the original object of visual recognition is simultaneously recognized, and the visual recognition effect is reduced.

  Accordingly, an object of the present invention is to provide an optical device that can suppress the visual recognition of a sub-image.

  An optical device according to the present invention includes a reflector array optical element, and a surface light emitter disposed to face the back or front of the reflector array optical element. Here, the reflector array optical element includes a first reflection plate having a plurality of first reflection surfaces arranged in parallel and a second reflection plate having a plurality of second reflection surfaces arranged in parallel. The reflecting surface and the second reflecting surface are arranged so as to be perpendicular to each other.

  According to the optical device described above, by causing the surface light emitter to emit light, the sub-image having a low light intensity is melted into the light emitted from the surface light emitter, making it difficult to see. On the other hand, an aerial image having a high light intensity is maintained in a visible state without being melted into the light emitted from the light guide plate.

  In the optical device, the surface light emitter has a light-transmitting light guide plate disposed facing the back surface or the front surface of the reflector array optical element, and a light source that makes light incident on the light guide plate. Is preferred. According to this configuration, the surface of the light guide plate can emit light by making light incident on the light guide plate.

  As an example, the light guide plate includes a light scattering agent therein. As another example, the light guide plate has a printed pattern formed on the surface thereof from a light scattering material. As still another example, the light guide plate has a processed pattern on the surface capable of scattering light incident from the light source. According to these configurations, the surface of the light guide plate can emit light efficiently. In addition, the light distribution characteristics of the surface light emitter can be easily controlled.

  In the optical device, a plurality of surface light emitters are provided in a direction perpendicular to the front surface or the back surface of the reflector array optical element, and these surface light emitters are configured such that the directions of light incident on the light guide plate from the light sources are different from each other. May be arranged. According to this configuration, by appropriately adjusting the light distribution characteristics of each of the plurality of surface light emitters, in the optical device, it is possible to clearly see the aerial image, and to make a sub-view from the user or a third party other than the user. The visual recognition of the image can be efficiently suppressed.

  In the optical device, the surface light emitter may include a plurality of light sources, and these light sources may be arranged so that the directions of light incident on the light guide plate are different from each other.

  In the optical device, the surface light emitter preferably overlaps another light with the sub-image formed by the light reflected by only one of the first reflection plate and the second reflection plate. . According to this configuration, the sub-image can be dissolved in the light emitted from the surface light emitter.

  In the optical device, the surface light emitter has a light distribution characteristic in which a haze value in a direction different from the direction is higher than a haze value in a direction in which an aerial image formed by the reflector array optical element is visible. It is preferable. According to this configuration, in the optical device, it is possible to efficiently suppress the visual recognition of the sub-image from the user or a third party other than the user while allowing the aerial image to be clearly recognized.

  In the above optical device, each of the first reflection plate and the second reflection plate may be configured by adhering each of a plurality of light-transmitting substrates with a plurality of light-transmitting adhesive layers. Good. In this configuration, the first reflecting surface and the second reflecting surface are formed by the interface between the base material and the adhesive layer in each of the first reflecting plate and the second reflecting plate. According to this configuration, a multiple reflection image is hardly generated. Moreover, the visual recognition of the transmitted image by a third party other than the user can be suppressed.

  With the optical device according to the present invention, the visual recognition of the sub-image can be suppressed.

It is the (A) side view and (B) front view which showed notionally the optical apparatus which concerns on 1st Embodiment. It is a disassembled perspective view of the reflector array optical element with which an optical apparatus is provided. FIG. 3 is an enlarged cross-sectional view partially showing a cross section taken along line III-III shown in FIG. It is the figure which showed notionally the image visually recognized with a reflector array optical element, when the (A)-(C) surface light-emitting body is not light-emitting. FIG. 6 is an enlarged view partially showing a print pattern formed on the surface of a light guide plate as a second embodiment. (A) (B) It is the expansion perspective view which partially showed two examples of the processing pattern formed in the surface of a light-guide plate as 3rd Embodiment. (A) The front view which showed the further another example of 3rd Embodiment, (B) The enlarged view which partially showed the light-guide plate used in the example. It is the (A) side view and (B) front view which showed notionally the optical apparatus which concerns on 4th Embodiment. It is the (A) side view and (B) front view which showed notionally the optical apparatus which concerns on 5th Embodiment.

[1] First Embodiment FIGS. 1A and 1B are a side view and a front view, respectively, conceptually showing an optical device according to a first embodiment. As shown in FIG. 1A, the optical device includes a reflector array optical element 1 and a surface light emitter 2.

  FIG. 2 is an exploded perspective view of the reflector array optical element 1. FIG. 3 is an enlarged sectional view partially showing a section taken along line III-III shown in FIG. As shown in FIG. 2, the reflector array optical element 1 includes a first reflection plate 11 and a second reflection plate 12.

  As shown in FIG. 3, the first reflection plate 11 includes a plurality of base materials 131 having a light transmission property and a plurality of adhesive layers 132 having a light transmission property. Specifically, each of the plurality of base materials 131 has a prismatic shape, and is arranged adjacent to each other so that their longitudinal directions are parallel to each other. And the base material 131 is mutually adhere | attached by interposing the contact bonding layer 132 between each, Thereby, while forming the 1st reflection plate 11, the 1st reflection plate 11 has a flat surface. A certain surface 11a and a back surface 11b are formed.

  In addition, materials having different refractive indexes are used for the base material 131 and the adhesive layer 132 so that the refractive index of light in the adhesive layer 132 is smaller than the refractive index of light in the base material 131.

  For example, the base material 131 is made of a transparent material having a refractive index of 1.58, and the adhesive layer 132 is made of a transparent material having a refractive index of 1.46. The adhesive material is used. Note that various light-transmitting materials that are not limited to these materials can be used for the substrate 131 and the adhesive layer 132. Moreover, the base material 131 does not necessarily need to be transparent, and may transmit at least part of visible light. The same applies to the adhesive layer 132.

  According to the first reflection plate 11, the base 131 and the adhesive layer 132 form a plurality of interfaces 13 a that are perpendicular to the front surface 11 a (or the back surface 11 b) and arranged in parallel. These interfaces 13a function as light reflecting surfaces (corresponding to “first reflecting surfaces” recited in the claims) of the first reflecting plate 11. Specifically, the interface 13a reflects light that satisfies the total reflection condition and transmits other light.

  The second reflection plate 12 has the same configuration as the first reflection plate 11 described above. Therefore, the front surface 12a and the back surface 12b, which are flat surfaces, are formed on the second reflection plate 12, and the substrate 131 and the adhesive layer 132 allow the second reflection plate 12 to be perpendicular to and parallel to the front surface 12a (or the back surface 12b). A plurality of arranged interfaces 13a are formed. These interfaces 13 a function as a light reflecting surface (corresponding to a “second reflecting surface” recited in the claims) of the second reflecting plate 12.

  The first reflection plate 11 and the second reflection plate 12 are overlapped with the front surface 11a and the back surface 12b facing each other and with their respective interfaces 13a (first reflection surface and second reflection surface) arranged perpendicular to each other. It has been. And the reflector array optical element 1 is comprised by joining the surface 11a and the back surface 12b mutually in this state. Therefore, in the reflector array optical element 1, the back surface 1b on which the image light L for forming the aerial image G1 (see FIG. 1A) is made up of the back surface 11b of the first reflection plate 11, and the image light A front surface 1 a from which L is emitted is configured by a surface 12 a of the second reflection plate 12. The image light L is emitted from the display panel 3 disposed on the back surface 1b side of the reflector array optical element 1 (see FIG. 1A).

  According to the reflector array optical element 1, the image light L incident from the back surface 1b side is sequentially reflected by the first reflection plate 11 and the second reflection plate 12, and as a result, the light emitted from the front surface 1a is in the air. An image G1 is formed on the front 1a side. Specifically, the image light L is placed at a symmetrical position with respect to the generation source (display panel 3) of the image light L with reference to the joint surface between the first reflection plate 11 and the second reflection plate 12 in the reflector array optical element 1. The images are formed, thereby forming an aerial image G1.

  In the reflector array optical element 1, the light reflecting surfaces (the first reflecting surface and the second reflecting surface) are formed by the interface 13a of the light transmitting member (the base material 131 and the adhesive layer 132). The incident light is reflected by utilizing the change in the refractive index at 13a. For this reason, most of the light components of light incident at a small incident angle (a small angle from the normal to the reflective surface) with respect to the reflective surface are transmitted without being reflected by the reflective surface. Such light causes multiple reflection in a reflector array optical element having a reflective surface formed of a mirror surface such as a metal layer. However, in this embodiment, since the light is transmitted through the reflective surface, a multiple reflection image is hardly generated. On the other hand, the light that is transmitted without being reflected by the reflecting surface forms a transmitted image that is visible from the transmitted side.

  As an image that can be viewed from the front side (viewing position P1 described later) of the reflector array optical element 1, in addition to the aerial image G1, a primary reflection image G3 that the user does not want to view is one of the sub-images. A transmission image G2 that is not visible to a third party other than the user is one of the sub-images as an image that can be viewed from the other side (position P2 side described later) of the reflector array optical element 1. Formed as. Here, the transmission image G <b> 2 is an image formed by light transmitted through both the first reflection plate 11 and the second reflection plate 12. The primary reflection image G3 is an image formed by light reflected by only one of the first reflection plate 11 and the second reflection plate 12.

  4A to 4C are diagrams conceptually showing images visually recognized by the reflector array optical element 1 when a surface light emitter 2 described later does not emit light. Specifically, FIGS. 4A to 4C are diagrams when viewed from the directions D1 to D3 shown in FIG. 1B. As shown in FIG. 1B, the direction from the center 1c of the reflector array optical element 1 to a predetermined viewing position P1 where the aerial image G1 can be viewed is a direction D1, and the viewing position P1 The direction to the opposite position P2 is a direction D2, and each direction to two positions P3 shifted from the visual recognition position P1 to both sides is a direction D3.

  As shown in FIG. 4A, the primary reflection image G3 is visually recognized together with the aerial image G1 from the direction D1. Further, as shown in FIGS. 4B and 4C, the aerial image G1 is not visually recognized from the directions D2 and D3, but the transmitted image G2 and the primary reflection image G3 are individually visible.

  The important point here is that the aerial image G1 is formed by imaging by the reflector array optical element 1, and therefore has a high light intensity. On the other hand, the aerial image G1 is a sub-image such as the transmission image G2 and the primary reflection image G3. The image is formed by light leaking from the reflector array optical element 1 without being formed, and the light intensity is low. In the present embodiment, by using such high and low light intensity, the aerial image G1 can be visually recognized, and the visibility of the sub-image from the user or a third party other than the user is suppressed. And the surface light-emitting body 2 demonstrated below plays the role.

  As shown in FIGS. 1A and 1B, the surface light emitter 2 includes a light-transmissive light guide plate 21 and a light source 22 that makes light incident on the light guide plate 21. In FIGS. 1A and 1B, light emitted from the light source 22 is indicated by white arrows. The same applies to other drawings.

  Specifically, the light guide plate 21 is disposed to face the front surface 1a of the reflector array optical element 1. In the present embodiment, the light guide plate 21 is disposed in surface contact with the front surface 1 a of the reflector array optical element 1. The light guide plate 21 may be disposed away from the front surface 1a of the reflector array optical element 1.

  As an example, the light guide plate 21 is made of an acrylic resin that is a transparent material. The light guide plate 21 may be made of various light transmissive materials that are not limited to acrylic resins. The light guide plate 21 does not necessarily need to be transparent, and may transmit at least part of visible light.

  Further, in the present embodiment, a light scattering agent is included in the light guide plate 21. As the light scattering agent, for example, particles formed of a material such as aluminum oxide are used.

In this embodiment, the light source 22 is an LED light source, and is arranged so that light can be incident from the side end face of the light guide plate 21. In the present embodiment, the light source 22 is arranged on the viewing position P1 side with respect to the light guide plate 21 so that light enters from the side end face on the viewing position P1 side of the light guide plate 21 (see FIG. 1B). ). The light incident on the light guide plate 21 is scattered by the light scattering agent, whereby a part of the scattered light is emitted from the surface 21 a of the light guide plate 21. The position of the light source 22 can be changed as appropriate.

  When the light scattering agent is uniformly contained in the light guide plate 21, the surface 21a of the light guide plate 21 emits light uniformly. As a result, the light emitted from the light guide plate 21 overlaps the sub-image. At this time, the light emission intensity on the surface 21a is preferably lower than the light intensity of the aerial image G1 and higher than the light intensity of the sub-image. As a result, the sub-image having a low light intensity is dissolved in the light emitted from the light guide plate 21 and is difficult to see. On the other hand, the high-intensity aerial image G1 is maintained in a visible state without being melted into the light emitted from the light guide plate 21.

  Thus, according to the optical device of the first embodiment, the aerial image G1 can be visually recognized, and the visual recognition of the sub-image from the user or a third party other than the user can be suppressed. Therefore, the contents of the aerial image G1 are not easily exposed to a third party other than the user, and accordingly, the security is hardly lowered. In addition, when the user visually recognizes the aerial image, the visual recognition of the sub-image other than the aerial image that is the original visual recognition target is suppressed, and thus the degradation of the visual recognition effect can be prevented. For example, the transmission image G2 is an image viewed from the position P2 (position opposite to the viewing position P1) with respect to the reflector array optical element 1, and there is a third party other than the user at the position P2. There was a risk of being visually recognized. According to the optical device of the first embodiment, such visual recognition of the transmission image G2 can be effectively suppressed.

  Further, the light guide plate 21 is disposed so as to face the front surface 1a of the reflector array optical element 1, so that the light guide plate 21 serves as a protective film for protecting the front surface 1a of the reflector array optical element 1, and the front surface 1a. It can be made to function as a light reflection preventing film for preventing the reflection of light.

  In the light guide plate 21, the light scattering agent may be included so that the concentration thereof changes. Specifically, the concentration of the light scattering agent is adjusted so as to increase the amount of light scattered in the directions D2 and D3 while suppressing the amount of light scattered in the direction D1 where the aerial image G1 is visible. Is preferred. More specifically, in the light guide plate 21, the concentration of the light scattering agent in the region through which the light forming the aerial image G1 passes is reduced, while the light scattering in the region through which the light forming the sub-image passes. Increase the concentration of the agent.

  Thereby, the surface light emitter 2 has a light distribution characteristic in which the haze value in the direction D2 or D3 different from the direction D1 is higher than the haze value in the direction D1 in which the aerial image G1 is visible. Thus, the light distribution characteristic of the surface light emitter 2 can be easily controlled by adjusting the concentration of the light scattering agent. As a result, in the optical device, it is possible to efficiently suppress the visual recognition of the sub-image from the user or a third party while enabling clear visual recognition of the aerial image G1.

[2] Second Embodiment As a second embodiment, the light guide plate 21 may have a printed pattern formed of a light scattering material on the surface 21a. This print pattern may be used instead of the light scattering agent described in the first embodiment, or may be used in combination with the light scattering agent. Since other configurations in the second embodiment are the same as those in the first embodiment, description thereof will be omitted.

  FIG. 5 is an enlarged view partially showing a print pattern formed on the surface 21 a of the light guide plate 21. As shown in FIG. 5, the print pattern is formed by printing a plurality of dots 211 on the surface 21 a of the light guide plate 21 using a light scattering material. Then, the light incident on the light guide plate 21 is scattered by the dots 211 constituting the print pattern, whereby a part of the scattered light is emitted from the surface 21 a of the light guide plate 21. Various printing methods such as inkjet printing and screen printing can be used for printing the dots 211.

  As an example of the second embodiment, the print pattern is formed so that the number of dots per unit area (occupancy ratio of the dots 211) on the surface 21a of the light guide plate 21 is uniform. In this case, the surface 21a of the light guide plate 21 emits light uniformly. Thereby, similarly to 1st Embodiment, the visual recognition of the subimage from a user or a third party can be suppressed, enabling visual recognition of the aerial image G1. Therefore, it is difficult for the visual effect and security to decrease.

  As another example of the second embodiment, the print pattern may be formed so that the occupation ratio of the dots 211 changes. Specifically, the occupancy rate of the dots 211 is adjusted so as to increase the amount of light scattered in the directions D2 and D3 while suppressing the amount of light scattered in the direction D1 where the aerial image G1 is visible. Is preferred. More specifically, in the surface 21 a of the light guide plate 21, the occupancy of the dots 211 in the region through which the light forming the aerial image G <b> 1 passes is reduced, while the light through which the sub image is formed passes. The occupation ratio of the dots 211 is increased.

  Thereby, the surface light emitter 2 has a light distribution characteristic in which the haze value in the direction D2 or D3 different from the direction D1 is higher than the haze value in the direction D1 in which the aerial image G1 is visible. In this way, the light distribution characteristics of the surface light emitter 2 can be easily controlled by adjusting the occupation ratio of the dots 211. As a result, in the optical device, it is possible to efficiently suppress the visual recognition of the sub-image from the user or a third party while enabling clear visual recognition of the aerial image G1.

[3] Third Embodiment As a third embodiment, the light guide plate 21 may have a processed pattern on the surface 21 a capable of scattering light incident from the light source 22. This processing pattern may be used in place of the light scattering agent described in the first embodiment or the printing pattern described in the second embodiment, or may be used in combination therewith. Since other configurations in the third embodiment are the same as those in the first embodiment, description thereof is omitted.

  6A and 6B are enlarged perspective views partially showing two examples of the processing pattern 212 formed on the surface 21a of the light guide plate 21. FIG. In the processing pattern 212, a pattern in which sawtooth-shaped irregularities 212a are continuously formed as shown in FIG. 6A, and a plurality of pyramidal projections 213 are arranged as shown in FIG. 6B. Patterns are included. The processing pattern 212 is not limited to these, and includes patterns of various shapes that can scatter light incident from the light source 22. Further, the processing pattern 212 may function as a prism. Various processing methods such as cutting, pressing, thermal transfer, and molding can be used for forming the processing pattern 212.

  Then, the light incident on the light guide plate 21 is scattered by the processing pattern 212, whereby a part of the scattered light is emitted from the surface 21 a of the light guide plate 21.

  As an example of the third embodiment, the processing pattern 212 is formed on the entire surface 21 a of the light guide plate 21. In this case, the image light L is scattered over the entire surface 21 a of the light guide plate 21. Thereby, similarly to 1st Embodiment, the visual recognition of the subimage from a user or a third party can be suppressed, enabling visual recognition of the aerial image G1. Therefore, it is difficult for the visual effect and security to decrease.

  As another example of the third embodiment, the processing pattern 212 is formed so as to increase the amount of light scattered in the directions D2 and D3 while suppressing the amount of light scattered in the direction D1 where the aerial image G1 can be visually recognized. The region and shape may be adjusted. Specifically, it is preferable to provide the processing pattern 212 in a region other than the region through which the light that forms the aerial image G1 passes through the surface 21a of the light guide plate 21 (the region through which the light that forms the sub-image passes). . Further, it is preferable to adjust the shape of the processing pattern 212 in accordance with the direction of light incident from the light source 22 so that light can be scattered in a predetermined direction.

  Thereby, the surface light emitter 2 has a light distribution characteristic in which the haze value in the direction D2 or D3 different from the direction D1 is higher than the haze value in the direction D1 in which the aerial image G1 is visible. In this way, the light distribution characteristics of the surface light emitter 2 can be easily controlled by adjusting the formation region and shape of the processed pattern 212. As a result, in the optical device, it is possible to efficiently suppress the visual recognition of the sub-image from the user or a third party while enabling clear visual recognition of the aerial image G1.

  FIG. 7A is a front view showing still another example of the third embodiment, and FIG. 7B is an enlarged view partially showing the light guide plate 21. In the optical device of the present embodiment, a light guide plate 21 having a processing pattern 212 (a plurality of protrusions 213) shown in FIG. 6B is used. In such a light guide plate 21, as shown in FIG. 7B, the light is incident on the two adjacent side surfaces 213 a and 213 b of the pyramid-shaped protrusion 213 obliquely, whereby the light is The light is refracted by each of the two side surfaces 213a and 213b, so that the light can be emitted in two directions Dp1 and Dp2.

  Therefore, as shown in FIG. 7A, in the optical device of the present embodiment, the light source 22 is configured such that light is incident from the side end surface of the light guide plate 21 on the position P2 side (the side opposite to the viewing position P1). The light guide plate 21 is disposed on the position P2 side. Further, the processing pattern 212 is such that the side surfaces 213a and 213b of the protrusion 213 are directed toward two positions P3 that are shifted from the visual recognition position P1 to both sides (that is, the two directions Dp1 and Dp2 are respectively shown in FIG. 7). (A) so as to coincide with the two directions D3 shown in FIG. Therefore, the light incident on the light guide plate 21 is scattered toward each of the two positions P3 by the protrusion 213. As a result, the visual recognition of the sub-image from two directions can be suppressed only by entering light from one direction with respect to the light guide plate 21.

[4] Fourth Embodiment FIGS. 8A and 8B are a side view and a front view, respectively, conceptually showing an optical device according to a fourth embodiment. As shown in FIGS. 8A and 8B, in the optical device, a plurality of surface light emitters 2 may be provided in a direction perpendicular to the front surface 1a (or back surface 1b) of the reflector array optical element 1. . In addition, since it is the same as that of 1st Embodiment about the other structure in 4th Embodiment, description is abbreviate | omitted.

  In the present embodiment, in the optical device described in the first embodiment, another surface light emitter 2 having the same configuration as that of the surface light emitter 2 is disposed in an overlapping manner. These surface light emitters 2 are arranged so that the directions of light incident on the light guide plate 21 from the light sources 22 are opposite to each other. More specifically, one light source 22 is arranged so that light enters from a side end surface on the viewing position P1 side of the corresponding light guide plate 21, and the other light source 22 corresponds to the corresponding light guide plate 21. Is arranged so that light enters from the side end face on the position P2 side (opposite side to the visual recognition position P1). The plurality of surface light emitters 2 are not limited to such an arrangement, and may be arranged so that the directions of light incident on the light guide plate 21 from the light sources 22 are different from each other as appropriate.

  According to the optical device of the fourth embodiment, by appropriately adjusting the light distribution characteristics of the two surface light emitters 2, the aerial image G <b> 1 can be clearly seen, and a sub-user from a user or a third party can be viewed. The visual recognition of the image can be efficiently suppressed.

  In addition, by using the processing pattern 212 (plurality of projections 213) shown in FIG. 6B for the light guide plate 21 that each of the two surface light emitters 2 has, as shown in FIG. Light incident on the light plate 21 can be scattered in four directions. Therefore, the visual recognition of the sub-image from a position different from the visual recognition position P1 (that is, a direction different from the direction D1) is prevented. As a result, high performance is exhibited in terms of visual effects and security.

[5] Fifth Embodiment FIGS. 9A and 9B are a side view and a front view, respectively, conceptually showing an optical apparatus according to the fifth embodiment. As shown in FIGS. 9A and 9B, in the optical device, the surface light emitter 2 may include a plurality of light sources 22. In addition, since it is the same as that of 1st Embodiment about the other structure in 5th Embodiment, description is abbreviate | omitted.

  In the present embodiment, two light sources 22 are provided, and these light sources 22 are arranged so that the directions of light incident on the light guide plate 21 are opposite to each other. More specifically, one light source 22 is arranged so that light enters from a side end surface on the viewing position P1 side of the light guide plate 21, and the other light source 22 is positioned on the position P2 side (viewing position P1) on the light guide plate 21. It is arranged so that light enters from the side end face on the opposite side. The plurality of light sources 22 are not limited to such an arrangement, and may be arranged so that the directions of light incident on the light guide plate 21 are different from each other as appropriate.

  According to the optical device of the fifth embodiment, as in the fourth embodiment, the aerial image G1 can be clearly recognized, and the visual recognition of the sub-image from the user or a third party can be efficiently suppressed. Become.

  Further, by using the processing pattern 212 (a plurality of protrusions 213) shown in FIG. 6B for the light guide plate 21, four lights incident on the light guide plate 21 can be obtained as shown in FIG. 9B. It becomes possible to scatter in the direction. Therefore, the visual recognition of the sub-image from a position different from the visual recognition position P1 (that is, a direction different from the direction D1) is prevented. As a result, high performance is exhibited in terms of visual effects and security.

[6] Other Embodiments The configuration of each part of the optical device described above is not limited to the one provided with the reflector array optical element 1 whose reflection surfaces (first reflection surface and second reflection surface) are formed by the interface 13a described above. Various types of aerial image G1 can be formed while an aerial image G1 can be formed, such as those provided with a reflector array optical element formed with a mirror surface such as a metal layer (that is, a multi-reflection image as a sub-image). It can be applied to an optical device.

  In the optical device described above, the light guide plate 21 may be disposed to face the back surface 1b of the reflector array optical element 1. Even with this configuration, the light emitted from the light guide plate 21 can overlap the sub-image. Therefore, the visual recognition of the sub-image from the user or a third party can be suppressed while enabling the visual recognition of the aerial image G1.

  Furthermore, in the optical device described above, the surface light emitter 2 can be a light emitter such as an organic EL.

  The above description of the embodiment is to be considered in all respects as illustrative and not restrictive. The scope of the present invention is shown not by the above embodiments but by the claims. Further, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

DESCRIPTION OF SYMBOLS 1 Reflector array optical element 1a Front 1b Back 1c Center 2 Surface light emitter 3 Display panel 11 1st reflection plate 11a Front surface 11b Back surface 12 Second reflection plate 12a Front surface 12b Back surface 13a Interface (1st reflection surface, 2nd reflection surface)
21 Light guide plate 21a Surface 22 Light source 131 Base material 132 Adhesive layer 211 Dot 212 Processing pattern 212a Concavity and convexity 213 Protrusion 213a, 213b Side face D1, D2, D3 Direction G1 Aerial image G2 Transmission image G3 Primary reflection image L Image light P1 Viewing position P2 , P3 position Dp1, Dp2 direction

Claims (10)

A first reflecting plate having a plurality of first reflecting surfaces arranged in parallel and a second reflecting plate having a plurality of second reflecting surfaces arranged in parallel are the first reflecting surface and the second reflecting surface. And a reflector array optical element that is vertically stacked on each other, and
A surface light emitter disposed opposite to the back surface or the front surface of the reflector array optical element;
An optical device comprising: The surface light emitter is
A light transmissive light guide plate disposed facing the back or front of the reflector array optical element;
A light source that makes light incident on the light guide plate;
The optical device according to claim 1, comprising:   The optical device according to claim 2, wherein the light guide plate includes a light scattering agent therein.   The optical device according to claim 2, wherein the light guide plate has a printed pattern formed on a surface thereof from a light scattering material.   The optical device according to any one of claims 2 to 4, wherein the light guide plate has a processing pattern on a surface thereof capable of scattering light incident from the light source. A plurality of the surface light emitters are provided in a direction perpendicular to the front surface or the back surface of the reflector array optical element;
The optical device according to any one of claims 2 to 5, wherein the plurality of surface light emitters are arranged such that directions of light incident on the light guide plate from the light sources are different from each other. The surface light emitter has a plurality of the light sources,
The optical device according to any one of claims 2 to 6, wherein the plurality of light sources are arranged such that directions of light incident on the light guide plate are different from each other.   The said surface light-emitting body overlaps another light with respect to the subimage formed with the light reflected only in any one of the said 1st reflective plate or the said 2nd reflective plate, The any one of Claims 1-7 An optical device according to claim 1.   The surface light emitter has a light distribution characteristic in which a haze value in a direction different from that direction is higher than a haze value in a direction in which an aerial image formed by the reflector array optical element is visible. The optical device according to claim 1. Each of the first reflection plate and the second reflection plate is configured by adhering each of a plurality of light-transmitting substrates with a plurality of light-transmitting adhesive layers,
The said 1st reflective surface and the said 2nd reflective surface are formed in the interface of the said base material and the said contact bonding layer in each of the said 1st reflective plate and the said 2nd reflective plate, The any one of Claims 1-9 An optical device according to claim 1.

Images