WO2022190660A1

WO2022190660A1 - Midair display device

Info

Publication number: WO2022190660A1
Application number: PCT/JP2022/001949
Authority: WO
Inventors: 勝平浜田; 敦山田; 知子大原
Original assignee: ミネベアミツミ株式会社
Priority date: 2021-03-12
Filing date: 2022-01-20
Publication date: 2022-09-15
Also published as: JP2022139534A

Abstract

The midair display device (1) according to an embodiment of the present invention comprises: a planar light emitter (3, 4); a retroreflection sheet (5); and a half mirror (6). The planar light emitter (3, 4) has a light-emitting unit (4b). The retroreflection sheet (5) is provided on the emission surface side of the planar light emitter (3, 4), and has a plurality of throughholes (5a) that represent a figure forming a midair display (I) at a location corresponding to the light emitting unit (4b). The half mirror (6) is located on the emission surface side of the retroreflection sheet (5). Concerning an arrangement pattern of the plurality of throughholes (5a), a portion of the midair display (I) being deficient that is due to an overlap between the midair display (I) and the throughholes (5a) and that occurs when viewed from a plurality of expected eye points (EP) is limited to a range that allows the arrangement pattern to be recognized.

Description

aerial display

The present invention relates to an aerial display device.

Conventionally, an aerial display device that forms an image in the air using a retroreflective sheet or a half mirror has been proposed (see, for example, Patent Documents 1 and 2).

Japanese Patent Application Laid-Open No. 2018-81138 JP 2017-107165 A

However, in the conventional technology, the main purpose is to make it easier to adjust the position where the image is formed, or to make it possible to observe the image displayed in the air from a wide angle. was not aimed at.

An object of the present invention is to provide an aerial display device capable of improving the quality of aerial display.

In order to solve the above problems and achieve the object, an aerial display device according to one aspect of the present invention includes a planar light emitter, a retroreflective sheet, and a half mirror. The said planar light-emitting body has a light emission part. The retroreflective sheet is arranged on the emission surface side of the planar light emitter, and has a plurality of through holes representing figures to be displayed in the air at positions corresponding to the light emitting portions. The half mirror is arranged on the exit surface side of the retroreflective sheet. The arrangement pattern of the plurality of through-holes remains within a range in which the lack of the aerial display due to the overlapping of the aerial display and the through-hole when viewed from a plurality of assumed eyepoints allows the arrangement pattern to be recognized.

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

FIG. 1 is a diagram of an example of an aerial display device according to an embodiment, viewed from the display surface side. FIG. 2 is a cross-sectional view taken along the line XX in FIG. FIG. 3 is a diagram showing an example of lack of aerial display. FIG. 4 is a diagram showing how the aerial display lacks in FIG. FIG. 5 is a diagram showing an example of the range of other through-holes of the retroreflective sheet in which one through-hole of the retroreflective sheet causes a lack of aerial display in the vertical direction (Y-axis direction). FIG. 6 is a diagram showing an example of the range of other through-holes of the retroreflective sheet in which one through-hole of the retroreflective sheet causes a missing display in the air 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 sheet in which lack of 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 arrangement patterns. FIG. 10 is a diagram (2) showing an example of evaluation of arrangement patterns. FIG. 11 is a diagram (3) showing an example of evaluation of arrangement patterns. FIG. 12 is a diagram (4) showing an example of evaluation of arrangement patterns. FIG. 13 is a diagram (5) showing an example of evaluation of arrangement patterns. FIG. 14 is a diagram (6) showing an example of evaluation of arrangement patterns. FIG. 15 is a diagram (7) showing an example of evaluation of arrangement patterns. FIG. 16 is a diagram (8) showing an example of evaluation of arrangement patterns. 17A and 17B are diagrams showing an example of reducing chipping of the aerial display by not arranging the through holes at regular intervals. FIG. 18 is a diagram (1) showing an example in which a frame is provided with through holes in the arrangement pattern, and the frame is made of through holes with a small diameter to reduce chipping of the aerial display. FIG. 19 is a diagram (2) showing an example in which a frame is provided with through holes in the arrangement pattern, and the frame is made of through holes with a small diameter, thereby reducing chipping of the aerial display. 20A and 20B are diagrams showing an example in which the missing of the aerial display is reduced by the blank area formed by the frame. FIG. 21 is a diagram showing an example in which chipping of aerial display is reduced by forming a frame with through holes having a small diameter. FIG. 22 is a diagram showing an example of reducing chipping of aerial display by shifting the arrangement of through holes from a straight line.

An aerial display device according to an embodiment will be described below with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, the dimensional relationship of each element in the drawings, the ratio of each element, and the like may differ from reality. Even between the drawings, there are cases where portions with different dimensional relationships and ratios are included. In principle, the contents described in one embodiment and modification are similarly applied to other embodiments and modifications.

FIG. 1 is a diagram showing an example of an aerial display device 1 according to one embodiment, viewed from the display surface side. FIG. 2 is a cross-sectional view taken along the line XX in FIG. The aerial display device 1 shown in FIGS. 1 and 2 is assumed to be used as an operation panel installed on the wall surface of a private toilet, and the display surface faces the horizontal direction.

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

In this embodiment, by adjusting the optical element of the light emitting unit 4b, the light is emitted in the direction where the eye point EP on the display surface side does not exist (lower left side in FIG. 2), and the light is emitted in the predetermined direction where the eye point EP exists. He is trying to suppress emitted light. The eyepoint EP is a position that is assumed to be viewed by the user.

In addition, the light-emitting portion 4b of the light guide plate 4 covers the positions of the plurality of through-holes 5a, which may be used to represent a figure to be displayed in the air, in the retroreflective sheet 5 described later (the periphery of the through-holes 5a). The light is emitted in a substantially rectangular area (shape viewed from the display surface side) that covers a predetermined range of the retroreflective sheet 5, or the position corresponding to one or more through holes 5a of the retroreflective sheet 5 is covered with a margin (through It is assumed that light is emitted from an area that also covers a predetermined range around the hole 5a. In the former case, the end portion of the light emitting portion 4b of the light guide plate 4 is set long in the light guide direction (Y-axis direction) from the position directly facing the outermost through hole 5a of the retroreflective sheet 5. FIG. This long end is determined in consideration of light distribution, positional accuracy of members, etc., rather than the position where the optical axis extends in the opposite direction from the through hole 5a of the retroreflective sheet 5 and reaches the vicinity of the back side of the light guide plate 4. It is a position outside the . The light emitting portion 4b of the light guide plate 4 extends substantially across the entire width of the light guide plate 4 in the lateral direction (X-axis direction). 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 in the horizontal direction (X-axis direction) for each through hole 5a of the retroreflective sheet 5 . In the former case, if the figure to be displayed in the air is to be changed, it is sufficient to change the through hole 5a of the retroreflective sheet 5, which facilitates the correspondence. Moreover, in the latter case, the light emitted from the light guide plate 4 can be narrowed down to the light necessary for display, so that the light efficiency can be improved.

A reflective sheet 8 is arranged on the non-display surface side of the frame 2 so as to cover the opening 2a. , increasing the brightness. The opening 2a may not be present on the non-display surface side of the frame 2 (it may be closed with a bottom plate), and the reflection sheet 8 may be provided on the non-display surface side of the light guide plate 4 .

Further, on the output surface side of the light guide plate 4, a retroreflective sheet 5 having a plurality of through-holes 5a representing figures to be displayed in the air at positions corresponding to the light emitting portions 4b is placed on the output surface side (light guide plate 4 opposite side). The retroreflective sheet 5 is a sheet on which transparent minute glass beads or the like are arranged without gaps on the surface, and has the property of emitting incident light through the same path (the incident angle and the emitting angle are the same). As the retroreflection sheet 5, in addition to glass bead spheres, a corner cube, which uses the inner surface of the vertices of a cube in which three surfaces having the property of reflecting light are combined at right angles to each other, is also used. can do. In this case, although the cost is slightly higher, there is an advantage that the light utilization efficiency is high and the blurring of the aerial display (aerial image) is reduced.

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 superimposed on the half mirror 6 on the outside. The top cover 7 can be omitted by applying a hard coat treatment to the outer side (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. Become. The hard coat treatment is performed for the purpose of scratch prevention, stain prevention, antibacterial, etc. Even when the top cover 7 is arranged on the outside, it is preferable to apply the hard coat treatment to the top cover 7 . The half mirror 6 is an optical member having a property of reflecting about half of the incident light and transmitting about the remaining half. The top cover 7 is made of transparent material and serves 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 only the aerial display can be easily seen. Also, the retroreflective sheet 5 and the half mirror 6 may be arranged with a slight inclination to each other.

In FIG. 2, the light emitted from the light emitting portion 4b of the light guide plate 4 constituting the planar light emitter passes through the through hole 5a of the retroreflective sheet 5 and exits along the path L1. About half of this light is reflected by the half mirror 6 and strikes the retroreflective sheet 5 along the path L2. The light that hits the retroreflective sheet 5 returns to the half mirror 6 along the path L3 at the same exit angle as the incident angle, and about half of the light is transmitted. Even if the angle of the path L1 changes, the light emitted from a certain point of the light emitting part 4b passes through the same position outside the aerial display device 1 because of the geometric relationship. An aerial display I by an image is performed and can be visually recognized from the user's eye point EP, and the user can be made to perform a touching action with the finger F.

A problem with the quality of the aerial display in the aerial display device 1 having the above structure is that the aerial display I is missing due to the layout pattern of the through holes 5 a of the retroreflective sheet 5 . If the mid-air display is missing, the figure desired to be displayed in mid-air cannot be displayed accurately, making it difficult to achieve a sufficient function as a switch interface or the like.

FIG. 3 is a diagram showing an example of missing aerial display. Originally, all of the 9 vertical by 9 horizontal white circles are displayed in the air. is displayed, and the lines of the aerial displays I-2 to I-9 above it are missing. The rows of black circles visible behind the aerial display I-9 are the through holes 5a of the retroreflective sheet 5 that are seen through.

FIG. 4 is a diagram showing how the aerial display is missing in FIG. 3, and is a cross-sectional view seen from the right side in FIG. Note that a planar light emitter such as the light guide plate 4 is omitted. In FIG. 4, when viewed from a certain eyepoint, the light emitted downward to the left from the through holes 5a-1 to 5a-9 of the retroreflective sheet 5 toward the exit surface side is reflected by the half mirror 6 and retroreflects. Return to the reflective sheet 5 side. Of this reflected light, the one corresponding to the through hole 5a-1 is retroreflected by the flat surface of 5, passes through the half mirror 6 and the top cover 7, and is normally displayed as an aerial display I-1. However, the reflected light corresponding to the through-holes 5a-2 to 5a-9 enters the through-holes 5a-1 to 5a-8 of the retroreflective sheet 5 and is not retroreflected normally. -2 to I-9 are missing.

FIG. 5 is a diagram showing an example of a range RV of other through-holes of the retroreflective sheet 5 in which one through-hole 5a of the retroreflective sheet 5 causes a lack of aerial display in the vertical direction (Y-axis direction). In FIG. 5, the vertical field of view of the eye point is assumed to be in the range of 10° to 35° with respect to the horizontal direction. Assuming that 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, the distance A from the lower end of the through-hole 5a to the upper end of the range RV is 2.0 mm. 53 mm, and the length B of the range RV is 14.0 mm.

FIG. 6 is a diagram showing an example of a range RH of other through-holes of the retroreflective sheet 5 in which one through-hole 5a of the retroreflective sheet 5 causes lack of aerial display in the horizontal direction (X-axis direction). In FIG. 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 at 0°. Assuming that 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, the length C of the range RH is 34.6 mm from the geometrical relationship.

FIG. 7 is a diagram showing an example of ranges RVH of other through-holes on the retroreflective sheet 5 where there is a possibility that missing aerial display may occur for one through-hole 5a. It is the figure seen from the surface side front. 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 retroreflective sheet 5 and half The distance from the mirror 6 is 10 mm. In FIG. 7, a trapezoidal range RVH having an upper base of 35.1 mm, a lower base of 41.9 mm, and a height of 11.5 mm is formed symmetrically from 2.53 mm below one through hole 5a. The presence of other through-holes can lead to chipping. Therefore, the arrangement pattern of the through-holes 5a that does not cause missing of the aerial display within the above-mentioned viewing range is limited to the case where a plurality of through-holes 5a are horizontally long or the through-holes 5a themselves are horizontally long. A large display area in which 5a are arranged vertically and horizontally is considered to cause chipping, and measures to reduce chipping are required.

As a basic measure to reduce chipping, the layout pattern of multiple through-holes can be recognized by overlapping the mid-air display and through-holes when viewed from multiple eyepoints. It is to stay within the scope. In the following, through the evaluation of the actual arrangement pattern, the arrangement pattern of the through-holes in which the missing of the aerial display is less likely to occur will be considered.

FIG. 8 is a diagram showing an example of the correspondence relationship between the evaluation of the arrangement pattern and the state. In FIG. 8, the evaluation "O" indicates that the pattern is recognizable with almost no chipped holes when viewed from any angle, as exemplified in the arrangement pattern column. As shown in the arrangement pattern column, the evaluation "Δ" indicates that only part of the hole is missing when viewed from any angle, and the pattern is recognizable. The evaluation "x" indicates that most of the display in the air disappears at a certain angle and the pattern cannot be visually recognized, as exemplified in the arrangement pattern column.

9 to 16 are diagrams showing examples of layout pattern evaluation. In FIG. 9, the arrangement patterns of

numbers

001 and 003 are evaluated as "x". Although the arrangement pattern of these is changed from the grid-like square arrangement, the reason is that the through holes are regularly arranged in the horizontal direction (horizontal direction in the figure) and vertical direction (vertical direction in the figure). be. On the other hand, the arrangement patterns of

numbers

002 and 004 are evaluated as "Δ". This is because the pitch of the vertically or horizontally aligned through-holes is set non-monotonic or irregularly, thereby reducing the overlap between the aerial display and the through-holes as seen from the eye point.

FIG. 17 is a diagram showing an example of reducing chipping of the aerial display by not arranging the through holes 5a at regular intervals. 17. In FIG. 17, the left figure shows the 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 right figure shows the case. The distance between the through-holes 5a-1 and 5a-2 is increased, the distance between the through-holes 5a-2 and 5a-3 is decreased, and the distance between the through-holes 5a-3 and 5a-4 is increased. is widened. In the figure on the left, which is arranged at equal intervals, the lower aerial displays I-1 and I-2 are displayed normally, but the upper aerial displays I-3 to I-5 are missing. On the other hand, in the figure on the right side, the aerial display I-4 is missing, but the other aerial displays I-1 to I-3 and I-5 are displayed normally, and the missing is improved. ing.

Next, in FIG. 10, the layout patterns with numbers 005 to 008 are evaluated as "△". This is because the vertically or horizontally aligned through-holes have different continuous lengths in adjacent columns or rows. Also, the arrangement pattern of number 005 is due to having a through hole forming a curved line of a circle or an arc. As a result, the overlap between the aerial display and the through-hole as viewed from the eye point is reduced, and the lack of the aerial display is reduced.

Next, in FIG. 11,

numbers

009, 010, and 012 are rated "◯", and number 011 is rated "△". This is because the arrangement pattern has through holes forming a frame. Also, the diameter of the through-holes forming the frame is smaller than the diameter of the through-holes forming the figure inside the frame. In addition, if the figure inside the frame is considered more important than the frame, for the part with high importance in terms of recognizing the aerial display, priority is given to reducing the overlap, and the importance in terms of recognizing the aerial display is prioritized. It can also be said that the diameter of the through-hole corresponding to the high portion is set larger than the diameter of the other through-holes. Also, the arrangement pattern of number 012 is due to the fact that the through holes corresponding to the frames are arranged in a zigzag pattern. Also, the arrangement patterns of

numbers

009 and 010 are due to having through-holes forming curved lines of circles or arcs. As a result, the overlap between the aerial display and the through-hole as viewed from the eye point is reduced, and the lack of the aerial display is reduced. Number 011 is evaluated as "Δ" because the number of consecutive through-holes arranged in the vertical or horizontal direction should be set to a minimum, but is a long straight line.

FIGS. 18 and 19 are diagrams showing an example in which a frame is provided by the through-holes 5a in the arrangement pattern and the frame is made of the through-holes 5a having a small diameter, thereby reducing chipping of the aerial display. In FIG. 18, a square frame is provided with staggered through holes 5a, and a square blank area V is formed between the internal figures, thereby reducing chipping of the aerial display. can. Further, in FIG. 19, a circular frame is provided by the through holes 5a, and a donut-shaped blank area V is formed between the inner figure and the circular frame, so that the missing of the aerial display can be reduced. .

FIG. 20 is a diagram showing an example in which the blank area V due to the frame reduces the omission of the mid-air display. In FIG. 20, the light emitted from the through holes 5a-2 to 5a-4 inside the frame of the retroreflective sheet 5 and reflected by the half mirror 6 is retroreflected by the flat blank area V, resulting in a flawless aerial display. They are I-2 to I-4. Further, the light emitted from the through hole 5a-5 and reflected by the half mirror 6 is also retroreflected by the flat blank area V, resulting in an aerial display I-5 without chipping. The light emitted from the through-hole 5a-1 and reflected by the half mirror 6 is also retroreflected by the flat surface outside the pattern, forming an aerial display I-1 without chipping.

FIG. 21 is a diagram showing an example in which the missing of the aerial display is reduced by forming a frame with through holes 5a having a small diameter. In FIG. 21, the diagram on the left side shows the arrangement of the through holes 5a on the retroreflective sheet 5, and the through holes 5a having a smaller diameter than the figure in the center form a circular frame. The figure on the right shows the aerial display seen from a certain angle, showing how the frame and the through holes in the central figure are chipped. However, since the diameter of the through-hole of the frame is smaller than that of the through-hole of the central graphic, the central graphic is only partially chipped, thereby suppressing deterioration of visibility.

FIG. 22 is a diagram showing an example of reducing missing of the aerial display by shifting the arrangement of the through holes 5a from a straight line. The staggered frame of number 012 in FIG. 11 is also close to this example. In FIG. 22, the figure on the left shows the through-holes 5a-1 to 5a-5 arranged linearly on the retroreflective sheet 5, though not at regular intervals, for comparison. ing. 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 missing. The figure on the right shows the through holes 5a-1 to 5a-5 arranged with a horizontal shift, and an aerial display is shown next to it. 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 chipped and remain visible.

Next, in FIG. 12, numbers 013 to 015 are rated "△", and number 016 is rated "x". This is because numbers 013 to 015 have different continuous lengths of vertically or horizontally aligned through-holes in adjacent columns or rows. Moreover, it is due to having a through-hole forming a curved line of a circle or an arc. Number 016 is different from number 015 only in the vertical and horizontal relationship, but priority is given to reducing overlap in the vertical direction when viewed from the eye point, so chipping is likely to occur, and the evaluation is "x". It has become.

Next, in FIG. 13,

numbers

017 and 018 are rated "△", and

numbers

019 and 020 are rated "◯". This is because the arrangement pattern has through holes forming a frame, and the diameter of the through holes forming the frame is smaller than the diameter of the through holes forming the figure inside the frame. The number 017 may also have a through hole forming a curve with a circle or an arc. However, since a large-diameter through-hole is provided inside No. 017, and a considerable part of the frame overlapping with this is missing, the evaluation is not "O".

Next, in FIG. 14, numbers 021 to 024 are evaluated "△". This is because the arrangement pattern has through holes forming a frame, and the diameter of the through holes forming the frame is smaller than the diameter of the through holes forming the figure inside the frame.

Next, in FIG. 15, numbers 025 to 028 are evaluated as "O". This is because the arrangement pattern has through-holes that form a frame (including cases where some sides are omitted), and the diameter of the through-holes that form the frame is the through-hole that forms the figure inside the frame. and the through holes are arranged obliquely with respect to the vertical or horizontal direction.

Next, in FIG. 16,

numbers

029, 030, and 032 are rated "O", and number 031 is rated "△". This is because, for

numbers

029 and 030, the arrangement pattern has a through-hole forming the frame, and the diameter of the through-hole forming the frame is smaller than the diameter of the through-hole forming the figure inside the frame. and having a through-hole forming a curved line of a circle or an arc.

Numbers

031 and 032 are also evaluated as "Δ" or higher in that they are almost framed, but since number 031 has a double frame, chipping is likely to occur in that portion, and the evaluation is " △”.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, 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 planar light emitter having a light emitting unit, and a graphic displayed in the air at a position corresponding to the light emitting unit, which is arranged on the emission surface side of the planar light emitter. A retroreflective sheet having a plurality of through holes and a half mirror arranged on the exit surface side of the retroreflective sheet are provided. The lack of the aerial display due to the overlapping of the display and the through-hole remains within the range in which the arrangement pattern can be recognized. As a result, it is possible to improve the quality of the aerial display.

In addition, priority is given to reducing overlap in areas of high importance in terms of recognizing aerial displays. This makes it possible to enhance the visibility of the portion of high importance.

In addition, in an environment where the retroreflective sheet is placed almost parallel to the wall surface, priority is given to reducing overlap in the vertical direction when viewed from the eye point. As a result, the visibility can be improved when the user looks down at the aerial display.

In addition, the diameter of the through-hole corresponding to the part with high importance in terms of recognizing the aerial display is set larger than the diameter of the other through-holes. This makes it possible to enhance the visibility of the portion of high importance.

In addition, in an environment where the retroreflective sheet is arranged substantially parallel to the wall surface, the pitch of the through-holes arranged vertically or horizontally is set non-monotonic or irregular. As a result, overlap between the aerial display and the through-hole viewed from the eye point can be reduced, and chipping of the aerial display can be reduced.

In addition, in an environment where the retroreflective sheet is arranged substantially parallel to the wall surface, the through-holes arranged vertically or horizontally have different continuous lengths from adjacent columns or rows. As a result, overlap between the aerial display and the through-hole viewed from the eye point can be reduced, and chipping of the aerial display can be reduced.

In addition, in an environment where the retroreflective sheet is arranged substantially parallel to the wall surface, the number of continuous through-holes lined up vertically or horizontally is set to a minimum. As a result, overlap between the aerial display and the through-hole viewed from the eye point can be reduced, and chipping of the aerial display can be reduced.

In addition, in an environment where the retroreflective sheet is arranged substantially parallel to the wall surface, the through holes are arranged in a vertical direction or diagonally with respect to the horizontal direction. As a result, overlap between the aerial display and the through-hole viewed from the eye point can be reduced, and chipping of the aerial display can be reduced.

It also has a through hole that forms a curve. As a result, overlap between the aerial display and the through-hole viewed from the eye point can be reduced, and chipping of the aerial display can be reduced.

In addition, the arrangement pattern has through holes that form a frame. As a result, overlap between the aerial display and the through-hole viewed from the eye point can be reduced, and chipping of the aerial display can be reduced.

Also, 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. As a result, overlap between the aerial display and the through-hole viewed from the eye point can be reduced, and chipping of the aerial display can be reduced.

Also, the through holes corresponding to the frames are arranged in a zigzag pattern. As a result, overlap between the aerial display and the through-hole viewed from the eye point can be reduced, and chipping of the aerial display can be reduced.

In addition, the present invention is not limited by the above-described embodiment. The present invention also includes those configured by appropriately combining the respective constituent elements described above. Further effects and modifications can be easily derived by those skilled in the art. Therefore, broader aspects of the present invention are not limited to the above-described embodiments, and various modifications are possible.

1 aerial display device, 2 frame, 2a aperture, 3 linear light source, 4 light guide plate, 4a light incident side surface, 4b light emitting part, 5 retroreflective sheet, 5a through hole, 6 half mirror, 7 top cover, 8 reflective sheet, EP eye point, I mid-air display, F finger

Claims

a planar light emitter having a light emitting portion;
a retroreflective sheet disposed on the emission surface side of the planar light emitter and having a plurality of through-holes representing a figure to be displayed in the air at positions corresponding to the light emitting portions;
a half mirror disposed on the exit surface side of the retroreflective sheet;
with
The arrangement pattern of the plurality of through holes is such that when viewed from a plurality of assumed eyepoints, the lack of the aerial display due to the overlapping of the aerial display and the through holes remains within a range in which the arrangement pattern can be recognized.
aerial display device.
Priority is given to reducing the overlap for portions of high importance in terms of recognizing the aerial display,
An aerial display device according to claim 1.
In an environment where the retroreflective sheet is arranged substantially parallel to the wall surface, priority is given to reducing the overlap in the vertical direction when viewed from the eye point.
3. An aerial display device according to claim 1 or 2.
The diameter of the through-hole corresponding to the portion of high importance in terms of recognizing the aerial display is set larger than the diameter of the other through-holes.
An aerial display device according to any one of claims 1 to 3.
In an environment where the retroreflective sheet is arranged substantially parallel to the wall surface, the pitch of the through-holes arranged vertically or horizontally is set non-monotonic or irregularly.
An aerial display device according to any one of claims 1 to 4.
In an environment in which the retroreflective sheet is arranged substantially parallel to a wall surface, the through-holes arranged vertically or horizontally have different continuous lengths from adjacent columns or rows.
An aerial display device according to any one of claims 1 to 5.
In an environment where the retroreflective sheet is arranged substantially parallel to the wall surface, the number of consecutive through-holes arranged vertically or horizontally is set to a minimum.
An aerial display device according to any one of claims 1 to 6.
In an environment where the retroreflective sheet is arranged substantially parallel to the wall surface, the through holes are arranged in a vertical direction or diagonally with respect to the horizontal direction,
An aerial display device according to any one of claims 1 to 7.
Having the through hole forming a curve,
An aerial display device according to any one of claims 1 to 8.
The arrangement pattern has the through holes forming a frame,
An aerial display device according to any one of claims 1 to 9.
The diameter of the through-holes forming the frame is smaller than the diameter of the through-holes forming a figure inside the frame,
An aerial display device according to claim 10 .
The through holes corresponding to the frame are arranged in a zigzag pattern,
An aerial display device according to claim 10 or 11.