JP7535466B2 - Aerial Display Device - Google Patents

Description

The present invention relates to an aerial display device.

Conventionally, aerial display devices have been proposed that use retroreflective sheets and half mirrors to project images in the air (see, for example, Patent Documents 1 and 2).

JP 2018-81138 A JP 2017-107165 A

However, the main purpose of conventional technology was to make it easier to adjust the position where the image was focused, or to make the image displayed in the air viewable from a wide range of angles, and it did not aim to improve the quality of the aerial display.

The present invention has been made in consideration of the above, and aims to provide an aerial display device that can improve the quality of aerial displays.

In order to solve the above-mentioned problems and achieve the object, an aerial display device according to one aspect of the present invention comprises a surface light emitter, a retroreflective sheet, and a half mirror. The surface light emitter has a light emitting section. The retroreflective sheet is arranged on the emission surface side of the surface light emitter, and has a plurality of through holes representing figures to be displayed in the air at positions corresponding to the light emitting sections. The half mirror is arranged on the emission surface side of the retroreflective sheet. The arrangement pattern of the plurality of through holes is such that when viewed from a plurality of assumed eye points, the aerial display is not chipped due to overlap between the aerial display and the through holes, and the arrangement pattern remains within a range where the chipped aerial display can be recognized.

An aerial display device according to one aspect of the present invention can improve the quality of the aerial display.

FIG. 1 is a view showing an example of an aerial display device according to one embodiment, as viewed from the display surface side. FIG. 2 is a cross-sectional view taken along line XX in FIG. FIG. 3 is a diagram showing an example of a missing portion of an aerial display. FIG. 4 is a diagram showing how the aerial display in FIG. 3 is chipped. FIG. 5 is a diagram showing an example of the range of other through holes in a retroreflective sheet where a loss of an aerial display occurs due to one through hole in the retroreflective sheet in the vertical direction (Y-axis direction). FIG. 6 is a diagram showing an example of the range of other through holes in a retroreflective sheet where a through hole in the retroreflective sheet causes a loss of an aerial display in the horizontal direction (X-axis direction). FIG. 7 is a diagram showing an example of the range of other through holes on the retroreflective sheeting where a loss of the aerial display may occur for one through hole. FIG. 8 is a diagram showing an example of the correspondence relationship between the evaluation of the arrangement pattern and the state. FIG. 9 is a diagram (1) showing an example of evaluation of a layout pattern. FIG. 10 is a diagram showing an example of evaluation of the arrangement pattern (2). FIG. 11 is a diagram showing an example of evaluation of the arrangement pattern (3). FIG. 12 is a diagram showing an example of evaluation of the arrangement pattern (4). FIG. 13 is a diagram (5) showing an example of evaluation of the arrangement pattern. FIG. 14 is a diagram (6) showing an example of evaluation of the arrangement pattern. FIG. 15 is a diagram showing an example of evaluation of the arrangement pattern (7). FIG. 16 is a diagram showing an example of evaluation of a layout pattern (8). FIG. 17 is a diagram showing an example in which through holes are not arranged at equal intervals to reduce loss of an aerial display. FIG. 18 is a diagram (1) showing an example in which a frame is provided in the layout pattern by through holes, and the frame is made of through holes with a small diameter, thereby reducing the loss of the aerial display. FIG. 19 is a diagram (2) showing an example in which a frame is provided in the layout pattern by through holes, and the frame is made of through holes with a small diameter, thereby reducing the loss of the aerial display. FIG. 20 is a diagram showing an example in which loss of an aerial display is reduced by a blank area created by a frame. FIG. 21 is a diagram showing an example in which loss of an aerial display is reduced by forming a frame with a through hole of a small diameter. FIG. 22 is a diagram showing an example in which the arrangement of through holes is shifted from a straight line to reduce the loss of the aerial display.

The aerial display device according to the embodiment will be described below with reference to the drawings. Note that the present invention is not limited to this embodiment. Furthermore, the dimensional relationships between elements in the drawings and the ratios between elements may differ from reality. The drawings may also include parts with different dimensional relationships and ratios. Furthermore, the contents described in one embodiment or variant apply, in principle, to other embodiments or variants.

Figure 1 is a view from the display surface side showing an example of an aerial display device 1 according to one embodiment. Figure 2 is a cross-sectional view taken along line X-X in Figure 1. Note that the aerial display device 1 in Figures 1 and 2 is intended to be used in an operation panel installed on a wall or the like in a private toilet, and the display surface faces horizontally.

In Figures 1 and 2, the aerial display device 1 has a linear light source 3 and a light guide plate 4 arranged in a frame 2 with a roughly rectangular opening 2a, which constitute a surface light emitter. The linear light source 3 is a light source that emits light linearly along the longitudinal direction (X-axis direction) of the light-entering side surface 4a of the light guide plate 4. The light guide plate 4 is made of a transparent material such as polycarbonate or acrylic, and guides the light incident from the light-entering side surface 4a to the terminal end, where the light is reflected by a light-emitting section 4b formed by an optical element provided on the back side (non-display surface).

In this embodiment, the optical element of the light-emitting unit 4b is adjusted to emit light in a direction where there is no eye point EP on the display surface side (the lower left side in FIG. 2), and suppress light that is emitted in a specific direction where the eye point EP is present. The eye point EP is the position where the user is expected to look.

The light-emitting portion 4b of the light guide plate 4 emits light in a substantially rectangular area (shape seen from the display surface side) that covers with a margin the positions of the multiple through holes 5a that may be used to display a figure to be displayed in the air in the retroreflective sheet 5 described later (also covers a predetermined range around the through holes 5a), or emits light in an area that covers with a margin the positions corresponding to one or more through holes 5a of the retroreflective sheet 5 (also covers a predetermined range around the through holes 5a). In the former case, the end of the light-emitting portion 4b of the light guide plate 4 is set longer in the light guide direction (Y-axis direction) from the position directly facing the outermost through hole 5a of the retroreflective sheet 5. This longer end is a position that is more outer than the position where the optical axis is extended in the opposite direction from the through hole 5a of the retroreflective sheet 5 to reach the rear side of the light guide plate 4, taking into consideration the light distribution and the positional accuracy of the members. In the horizontal direction (X-axis direction), the light-emitting portion 4b of the light guide plate 4 extends almost the entire width of the light guide plate 4. In the latter case, the light-emitting portion 4b of the light guide plate 4 is set long in the light guide direction (Y-axis direction) and the horizontal direction (X-axis direction) for each through-hole 5a of the retroreflective sheet 5. In the former case, when changing the figure to be displayed in the air, it is easy to change the through-hole 5a of the retroreflective sheet 5. Also, in the latter case, the light emitted from the light guide plate 4 can be narrowed down to only that required for display, thereby improving light efficiency.

A reflective sheet 8 is disposed on the non-display surface side of the frame 2 so as to cover the opening 2a, and returns light leaking from the light guide plate 4 to the back side, thereby increasing light efficiency and brightness. Note that the opening 2a does not need to be present on the non-display surface side of the frame 2 (it may be blocked by a bottom plate), and it is sufficient that the reflective sheet 8 is provided on the non-display surface side of the light guide plate 4.

In addition, on the exit surface side of the light guide plate 4, a retroreflective sheet 5 having a plurality of through holes 5a showing figures to be displayed in the air at positions corresponding to the light emitting parts 4b is arranged with the reflective surface facing the exit surface side (opposite side to the light guide plate 4). The retroreflective sheet 5 is a sheet in which transparent tiny glass beads or the like are arranged on the surface without gaps, and has the property of emitting incident light along the same path (the incident angle and the exit angle are the same). In addition to glass beads, the retroreflective sheet 5 can also be made of a corner cube, which is a cube with three faces that reflect light and are combined at right angles to each other, using the inner surfaces of the vertices of the cube. In this case, the cost is slightly higher, but the advantage is that the light utilization efficiency is high and the aerial display (aerial image) is less blurred.

A half mirror 6 is arranged on the display surface side of the frame 2 so as to cover the opening 2a, and a top cover 7 is overlapped on the half mirror 6 on the outside. The top cover 7 can be omitted by applying a hard coat treatment to the outside (viewing side) of the half mirror 6, but since the half mirror 6 is in the form of a film, a transparent resin plate for support is required. The hard coat treatment is applied for the purpose of preventing scratches, dirt, antibacterial properties, etc., and it is preferable to apply a hard coat treatment to the top cover 7 even when the top cover 7 is arranged on the outside. The half mirror 6 is an optical member that has the property of reflecting about half of the incident light and transmitting about the remaining half. The top cover 7 is formed of a transparent material and is intended to protect the half mirror 6. By reducing the transmittance of the top cover 7, it becomes difficult to see the inside of the aerial display device 1 from the outside, and it is possible to make it easier to see only the aerial display. The retroreflective sheet 5 and the half mirror 6 may be arranged at a slight angle to each other.

In FIG. 2, light emitted from the light-emitting section 4b of the light guide plate 4 constituting the surface light-emitting body passes through the through hole 5a of the retroreflective sheet 5 and exits via path L1. Approximately half of this light is reflected by the half mirror 6 and strikes the retroreflective sheet 5 via path L2. The light that strikes the retroreflective sheet 5 returns to the half mirror 6 via path L3 at the same exit angle as the incident angle, and approximately half of it is transmitted. Even if the angle of path L1 changes, the light emitted from a certain point on the light-emitting section 4b passes through the same position outside the aerial display device 1 due to a geometric relationship, so that an aerial display I is performed using an aerial image on the outside of the half mirror 6 and top cover 7, which can be viewed from the user's eye point EP, and the user can perform the action of touching with his/her finger F.

A problem with the quality of the aerial display in the aerial display device 1 with the above structure is the occurrence of chipping in the aerial display I due to the arrangement pattern of the through holes 5a in the retroreflective sheet 5. When chipping occurs in the aerial display, the figure to be displayed in the air is not displayed accurately, making it difficult to fully function as a switch interface, etc.

Figure 3 shows an example of a missing aerial display. Normally, all 9 vertical x 9 horizontal aerial displays are white circle displays, but only the bottom row of aerial display I-1 is displayed, and the rows above it, I-2 to I-9, are missing. The row of black circles visible behind aerial display I-9 are the through holes 5a of the retroreflective sheet 5, which can be seen through.

Figure 4 is a cross-sectional view of the aerial display in Figure 3, seen from the right side. The surface light emitter such as the light guide plate 4 is omitted. In Figure 4, when viewed from a certain eye point, light emitted from the through holes 5a-1 to 5a-9 of the retroreflective sheet 5 toward the output surface in a downward left direction is reflected by the half mirror 6 and returns to the retroreflective sheet 5 side. Of this reflected light, the light corresponding to the through hole 5a-1 is reflected by the flat surface of 5 and passes through the half mirror 6 and top cover 7, and is displayed normally as the aerial display I-1. However, the light corresponding to the through holes 5a-2 to 5a-9 of the reflected light enters the through holes 5a-1 to 5a-8 of the retroreflective sheet 5 and is not reflected normally, so the aerial displays I-2 to I-9 are missing.

Figure 5 is a diagram showing an example of a range RV of other through holes of the retroreflective sheet 5 where one through hole 5a of the retroreflective sheet 5 causes a missing part of the aerial display in the vertical direction (Y-axis direction). In Figure 5, the vertical field of view of the eye point is in the range of 10° to 35° with respect to the horizontal direction. Now, if the diameter of the through hole 5a is 1 mm, and the distance between the retroreflective sheet 5 and the half mirror 6 is 10 mm, then from the geometric relationship, the distance A from the bottom end of the through hole 5a to the top end of the range RV is 2.53 mm, and the length B of the range RV is 14.0 mm.

Figure 6 is a diagram showing an example of the range RH of other through holes of the retroreflective sheet 5 where one through hole 5a of the retroreflective sheet 5 causes a missing part of the aerial display in the horizontal direction (X-axis direction). In Figure 6, the horizontal field of view of the eye point is in the range of -40° to +40° with respect to the front direction, and the vertical field of view is 0°. Now, if the diameter of the through hole 5a is 1 mm and the distance between the retroreflective sheet 5 and the half mirror 6 is 10 mm, then from the geometrical relationship, the length C of the range RH is 34.6 mm.

Figure 7 shows an example of a range RVH of other through holes on the retroreflective sheet 5 where a chipping of the aerial display may occur for one through hole 5a, as viewed from the front of the exit surface side of the retroreflective sheet 5. The vertical field of view of the eye point is 10° to 35° with respect to the horizontal direction, the horizontal field of view is -40° to +40° with respect to the front direction, the diameter of the through hole 5a is 1 mm, and the distance between the retroreflective sheet 5 and the half mirror 6 is 10 mm. In Figure 7, if there are other through holes in a trapezoidal range RVH 2.53 mm below one through hole 5a and symmetrically on the left and right, with an upper base of 35.1 mm, a lower base of 41.9 mm, and a height of 11.5 mm, a chipping may occur. Therefore, the arrangement pattern of the through holes 5a that will not cause any loss of the aerial display within the above-mentioned field of view will only be when multiple through holes 5a are arranged horizontally, or when the through holes 5a themselves are horizontally long. If the through holes 5a are arranged vertically and horizontally and the display area is large, loss will occur, and measures to reduce loss will be necessary.

The basic measure to reduce loss is to have an arrangement pattern for multiple through holes that, when viewed from multiple expected eyepoints, causes loss of the aerial display due to overlap between the aerial display and the through holes to a level where the arrangement pattern can be recognized. Below, we will consider arrangement patterns for through holes that are less likely to cause loss of the aerial display through an evaluation of actual arrangement patterns.

Figure 8 is a diagram showing an example of the correspondence between the evaluation of the arrangement pattern and the state. In Figure 8, the evaluation "◯" is a state in which almost no holes are missing and the pattern can be recognized from any angle, as exemplified in the column for arrangement pattern. The evaluation "△" is a state in which only a portion of the holes is missing and the pattern can be recognized from any angle, as exemplified in the column for arrangement pattern. The evaluation "×" is a state in which most of the aerial display disappears at a certain angle and the pattern cannot be seen, as exemplified in the column for arrangement pattern.

Figures 9 to 16 are diagrams showing examples of layout pattern evaluations. In Figure 9, layout patterns 001 and 003 are rated "X". These layout patterns are modified from a grid-like square layout, but this is because the through-holes are regularly arranged in the horizontal direction (left-right direction in the figure) and vertical direction (up-down direction in the figure). In contrast, layout patterns 002 and 004 are rated "△". This is because the pitch of the through-holes lined up vertically or horizontally is set non-monotonic or irregular, which reduces the overlap between the aerial display and the through-holes as seen from the eyepoint.

Figure 17 is a diagram showing an example of reducing the loss of aerial displays by arranging the through holes 5a at unequal intervals. In Figure 17, the diagram on the left shows a case where the through holes 5a-1 to 5a-5 of the retroreflective sheet 5 are arranged at equal intervals in the vertical direction (Y-axis direction) for comparison, and the diagram on the right shows a case where the interval between the through holes 5a-1 and 5a-2 is widened, the interval between the through holes 5a-2 and 5a-3 is shorted, and the interval between the through holes 5a-3 and 5a-4 is widened. In the diagram on the left where the through holes are arranged at equal intervals, the aerial displays I-1 and I-2 on the lower side are displayed normally, but the aerial displays I-3 to I-5 on the upper side are lost. In contrast, in the diagram on the right, the aerial display I-4 is lost, but the other aerial displays I-1 to I-3 and I-5 are displayed normally, and the loss has been improved.

Next, in Figure 10, the layout patterns with numbers 005 to 008 are rated "△". This is because the through-holes lined up vertically or horizontally have different lengths of continuity with adjacent columns or rows. Also, the layout pattern with number 005 has through-holes that form a curved line formed by a circle or arc. This reduces the overlap between the aerial display and the through-holes as seen from the eyepoint, and reduces the amount of missing aerial display.

Next, in FIG. 11, numbers 009, 010, and 012 are rated "◯", and number 011 is rated "△". This is because the arrangement pattern has a through hole that forms a frame. Also, the diameter of the through hole that forms the frame is smaller than the diameter of the through hole that forms the figure inside the frame. If the figure inside is considered to be more important than the frame, it can be said that the priority is to reduce overlap in the part that is important in terms of recognizing the aerial display, and the diameter of the through hole corresponding to the part that is important in terms of recognizing the aerial display is set larger than the diameter of the other through holes. Also, for the arrangement pattern of number 012, the through holes corresponding to the frame are arranged in a staggered pattern. Also, for the arrangement patterns of numbers 009 and 010, the through holes form a curved line of a circle or an arc. As a result, the overlap between the aerial display and the through hole seen from the eye point is reduced, and the missing part of the aerial display is reduced. Number 011 has been rated "△" because the number of consecutive through holes lined up vertically or horizontally should be kept to a minimum, but they are a long straight line.

Figures 18 and 19 show examples in which a frame is provided in the layout pattern using through holes 5a, and the frame is made of through holes 5a with a small diameter, thereby reducing loss of the aerial display. In Figure 18, a rectangular frame is provided using staggered through holes 5a, and a rectangular blank area V is formed between the frame and the internal figure, thereby reducing loss of the aerial display. Also, in Figure 19, a circular frame is provided using through holes 5a, and a doughnut-shaped blank area V is formed between the frame and the internal figure, thereby reducing loss of the aerial display.

Figure 20 is a diagram showing an example in which the loss of the aerial display is reduced by the blank area V created by the frame. In Figure 20, the light that leaves through holes 5a-2 to 5a-4 inside the frame of the retroreflective sheet 5 and is reflected by the half mirror 6 is retroreflected by the flat blank area V, resulting in aerial displays I-2 to I-4 that are free of loss. Light that leaves through hole 5a-5 and is reflected by the half mirror 6 is also retroreflected by the flat blank area V, resulting in aerial display I-5 that is free of loss. Light that leaves through hole 5a-1 and is reflected by the half mirror 6 is also retroreflected by the flat surface outside the pattern, resulting in aerial display I-1 that is free of loss.

Figure 21 shows an example of how creating a frame with small-diameter through-holes 5a reduces loss of the aerial display. In Figure 21, the diagram on the left shows the arrangement of through-holes 5a on a retroreflective sheet 5, with a circular frame formed by through-holes 5a with a smaller diameter than the central figure. The diagram on the right shows the aerial display viewed from a certain angle, showing how loss occurs due to the frame and the through-holes in the central figure. However, because the diameter of the through-hole in the frame is smaller than the diameter of the through-hole in the central figure, loss of the central figure remains partial, minimizing loss of visibility.

Figure 22 shows an example of reducing the loss of the aerial display by shifting the arrangement of the through holes 5a from a straight line. The staggered frame of number 012 in Figure 11 is similar to this example. In Figure 22, the left-hand diagram shows a comparison in which the through holes 5a-1 to 5a-5 are arranged in a straight line on the retroreflective sheet 5, but not at equal intervals, and the diagram next to it shows the aerial display. In this case, the aerial displays I-1 to I-3 and I-5 are displayed normally, but the aerial display I-4 is completely lost. The right-hand diagram shows a comparison in which the through holes 5a-1 to 5a-5 are shifted left and right, and the diagram next to it shows the aerial display. In this case, the aerial displays I-1, I-3 and I-5 are displayed normally, and the aerial displays I-2 and I-4 are only half-lost, so they remain visible.

Next, in Figure 12, numbers 013 to 015 are rated "△", and number 016 is rated "X". This is because numbers 013 to 015 have through holes that are lined up vertically or horizontally, but the length of continuity with adjacent columns or rows is different. Also, they have through holes that form curves due to circles or arcs. Number 016 differs from number 015 only in its vertical and horizontal relationship, but since less overlap in the vertical direction when viewed from the eyepoint is prioritized, chipping is more likely to occur, and so it is rated "X".

Next, in Figure 13, numbers 017 and 018 are rated "△", while numbers 019 and 020 are rated "◯". This is because the arrangement pattern has through holes that form a frame, and the diameter of the through holes that form the frame is smaller than the diameter of the through holes that form the figure inside the frame. Number 017 may also have through holes that form a curved line formed by a circle or arc. However, there is a through hole with a large diameter inside number 017, and a large part of the frame that overlaps with this is missing, so it is not rated "◯".

Next, in Figure 14, numbers 021 to 024 are rated "△". This is because the layout pattern has through holes that form a frame, and the diameter of the through holes that form the frame is smaller than the diameter of the through holes that form the figures inside the frame.

Next, in Figure 15, numbers 025 to 028 are rated "Good". This is because the layout pattern has through holes that form a frame (including cases where some sides are omitted), the diameter of the through holes that form the frame is smaller than the diameter of the through holes that form the figure inside the frame, and the through holes are lined up diagonally relative to the vertical or horizontal direction.

Next, in FIG. 16, numbers 029, 030, and 032 are rated "Good", while number 031 is rated "Poor". This is because numbers 029 and 030 have through holes that form a frame in their layout pattern, the diameter of the through holes that form the frame is smaller than the diameter of the through holes that form the figure inside the frame, and the through holes form a curved line formed by a circle or arc. Numbers 031 and 032 are also rated "Poor" or better in that they almost always have a frame, but number 031 has a double frame, which makes it prone to chipping in that area, and so it is rated "Poor".

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention.

As described above, the aerial display device according to the embodiment includes a surface light-emitting body having a light-emitting section, a retroreflective sheet arranged on the emission surface side of the surface light-emitting body and having a plurality of through-holes representing figures to be displayed in the air at positions corresponding to the light-emitting section, and a half mirror arranged on the emission surface side of the retroreflective sheet, and the arrangement pattern of the plurality of through-holes is such that when viewed from a plurality of expected eye points, any loss in the aerial display due to overlap between the aerial display and the through-holes remains within a range where the arrangement pattern can be recognized. This can improve the quality of the aerial display.

In addition, priority is given to minimizing overlap for areas that are important in terms of recognizing the aerial display. This makes it possible to increase the visibility of areas that are important.

In addition, in an environment where the retroreflective sheet is placed approximately parallel to the wall surface, it is prioritized to minimize vertical overlap when viewed from the eyepoint. This can improve visibility when the user is looking down on the aerial display.

The diameter of the through-holes that correspond to the parts that are important in terms of recognizing the aerial display is set to be larger than the diameter of the other through-holes. This makes it possible to improve the visibility of the parts that are important.

In addition, in an environment where the retroreflective sheet is placed approximately parallel to the wall surface, the pitch of the through holes arranged vertically or horizontally is set to be non-monotonic or irregular. This reduces the overlap between the aerial display and the through holes as seen from the eyepoint, and reduces the amount of missing parts of the aerial display.

In addition, in an environment where the retroreflective sheet is arranged approximately parallel to the wall surface, the through-holes arranged in the vertical or horizontal direction have different lengths of continuity with adjacent columns or rows. This reduces the overlap between the aerial display and the through-holes as seen from the eyepoint, and reduces the amount of missing parts of the aerial display.

In addition, in an environment where the retroreflective sheet is placed approximately parallel to the wall surface, the number of consecutive through-holes aligned vertically or horizontally is set to a minimum. This reduces the overlap between the aerial display and the through-holes as seen from the eyepoint, and reduces the amount of missing parts of the aerial display.

In addition, in an environment where the retroreflective sheet is placed approximately parallel to the wall surface, it has through-holes that are aligned diagonally to the vertical or horizontal direction. This reduces the overlap between the aerial display and the through-holes as seen from the eyepoint, reducing the amount of missing parts of the aerial display.

It also has a through hole that forms a curve. This reduces the overlap between the aerial display as seen from the eyepoint and the through hole, reducing the amount of missing parts of the aerial display.

The layout pattern also has through holes that form a frame. This reduces the overlap between the aerial display as seen from the eyepoint and the through holes, reducing the amount of missing parts of the aerial display.

In addition, the diameter of the through holes that make up the frame is smaller than the diameter of the through holes that make up the figure inside the frame. This reduces the overlap between the aerial display as seen from the eyepoint and the through holes, reducing the amount of missing aerial display.

The through-holes corresponding to the frames are also arranged in a staggered pattern. This reduces the overlap between the aerial display and the through-holes as seen from the eyepoint, reducing the amount of missing parts of the aerial display.

Furthermore, the present invention is not limited to the above-mentioned embodiment. The present invention also includes configurations in which the above-mentioned components are appropriately combined. Furthermore, further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the present invention are not limited to the above-mentioned embodiment, and various modifications are possible.

1 Aerial display device, 2 Frame, 2a Opening, 3 Linear light source, 4 Light guide plate, 4a Light entrance side, 4b Light emitting part, 5 Retroreflective sheet, 5a Through hole, 6 Half mirror, 7 Top cover, 8 Reflective sheet, EP Eye point, I Aerial display, F Finger

Claims (12)

A surface light emitter having a light emitting portion;
A retroreflective sheet is disposed on the emission surface side of the surface light-emitting body and has a plurality of through holes representing a figure to be displayed in the air at a position corresponding to the light-emitting portion;
A half mirror arranged on the exit surface side of the retroreflective sheet;
Equipped with
The arrangement pattern of the plurality of through holes is such that, when viewed from a plurality of assumed eye points, any loss of the aerial representation due to overlap between the aerial representation and the through holes is limited to a range in which the arrangement pattern can be recognized.
Aerial display device. A priority is given to reducing the overlap in areas that are important in terms of recognizing the aerial display.
The aerial display device according to claim 1 . In an environment in which the retroreflective sheet is disposed approximately parallel to a wall surface, it is preferred that the overlap in the vertical direction when viewed from the eye point is reduced.
The aerial display device according to claim 1 or 2. The diameter of the through hole corresponding to a part having high importance in terms of recognizing the aerial display is set to be larger than the diameter of the other through holes.
The aerial display device according to any one of claims 1 to 3. In an environment in which the retroreflective sheet is disposed substantially parallel to a wall surface, the pitch of the through holes arranged in the vertical or horizontal direction is set to be non-monotonic or irregular.
The aerial display device according to any one of claims 1 to 4. In an environment in which the retroreflective sheet is disposed substantially parallel to a wall surface, the through holes arranged in the vertical or horizontal direction have different continuous lengths from adjacent columns or rows.
The aerial display device according to any one of claims 1 to 5. In an environment in which the retroreflective sheet is disposed substantially parallel to a wall surface, the number of continuous through holes arranged vertically or horizontally is set to a minimum.
The aerial display device according to any one of claims 1 to 6. In an environment in which the retroreflective sheet is disposed substantially parallel to a wall surface, the through holes are arranged in a diagonal direction relative to the vertical or horizontal direction.
The aerial display device according to any one of claims 1 to 7. The through hole has a curved line.
The aerial display device according to any one of claims 1 to 8. The arrangement pattern has the through holes forming a frame.
The aerial display device according to any one of claims 1 to 9. a diameter of the through hole forming the frame is smaller than a diameter of the through hole forming a figure inside the frame;
The aerial display device according to claim 10. The through holes corresponding to the frames are arranged in a staggered pattern.
The aerial display device according to claim 10 or 11.

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