Carsickness reduction device and carsickness reduction method

Abstract

Provided is a carsickness reduction device capable of providing visual information (as a result, it is possible to reduce carsickness caused by a sense of balance) to a person riding in a vehicle, which degree the person tilts with respect to the horizontal level. A carsickness reduction device (10) is provided with a display device (20 (20F, 20L, 20R)) that is provided in a passenger space of a vehicle provided with the passenger space in which a person sits, and that displays, in the passenger space, horizontal lines (HL20F, HL20L, HL20R) extending in a horizontal direction orthogonal to the gravity direction of the vehicle regardless of the inclination of the vehicle.

Description

Technical Field

[0001] The present disclosure relates to a motion sickness reduction device and a motion sickness reduction method, and in particular to a motion sickness reduction device and a motion sickness reduction method that can provide visual information to a person riding in a vehicle as to how much the person is tilted relative to the horizontal (as a result, motion sickness caused by a sense of balance can be reduced). Background Art

[0002] As a countermeasure for motion sickness, there is known a light array system that is mounted on a vehicle and displays a flow of light corresponding to the movement of the vehicle (for example, see Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application No. 2019-523657 Summary of the invention

[0006] Problems to be solved by the invention

[0007] However, the inventors of the present invention have conducted research and found that in the light array system described in the above-mentioned Patent Document 1, the flow of light displayed imitates the specific movement of a vehicle, and people riding in the vehicle have no visual information about how much they are tilted relative to the horizontal, which is insufficient for countermeasures against motion sickness caused by a sense of balance.

[0008] The present disclosure is completed to solve such problems, and its purpose is to provide a motion sickness reduction device and a motion sickness reduction method that can provide visual information to the degree to which a person riding in a vehicle is tilted relative to the horizontal (as a result, the motion sickness caused by the sense of balance can be reduced).

[0009] Means for solving problems

[0010] The motion sickness reduction device disclosed herein has a display device, which is arranged in the passenger space of a vehicle having a passenger space for people to sit in, and displays a horizontal line extending in a horizontal direction orthogonal to the gravity direction of the vehicle in the passenger space regardless of the inclination of the vehicle.

[0011] With such a structure, it is possible to provide visual information to the person riding in a vehicle on how much the person is tilted relative to the horizontal (as a result, motion sickness caused by a sense of balance can be reduced).

[0012] This is because, in the passenger space of a vehicle having a passenger space for passengers, a horizontal line extending in a horizontal direction orthogonal to the gravity direction of the vehicle is displayed regardless of the inclination of the vehicle.

[0013] In addition, the motion sickness reducing device may further include a road condition detection unit that detects a road condition on which the vehicle is traveling, and the display device may display the horizontal line when the road condition satisfies a predetermined condition.

[0014] Furthermore, in the above-mentioned motion sickness reducing device, the predetermined condition may be a slope, a curved road, or a straight road traveled at an acceleration equal to or less than a predetermined acceleration force.

[0015] Furthermore, in the above-mentioned motion sickness reducing device, the display device may display, together with the horizontal line, a bright spot that moves along the horizontal line in a direction corresponding to acceleration or deceleration of the vehicle.

[0016] Furthermore, in the above-mentioned motion sickness reducing device, the display device may be provided on a front window glass or a side window glass constituting a wall surface surrounding the passenger space.

[0017] Furthermore, in the above-mentioned motion sickness reducing device, the display device may be further provided on a rear window glass constituting a wall surface surrounding the riding space.

[0018] Furthermore, in the above-mentioned motion sickness reducing device, the display device may be provided on a front instrument panel or a side door provided in the riding space.

[0019] Furthermore, in the above-mentioned motion sickness reducing device, the display device may be further provided on a rear instrument panel provided in the passenger space.

[0020] Furthermore, in the above-mentioned motion sickness reducing device, the display device may be a film light source in the form of a film.

[0021] Furthermore, in the above-mentioned motion sickness reducing device, the film light source may be an organic EL or a film-shaped LED.

[0022] In addition, the motion sickness reducing device may further include a horizontal line setting unit that sets at least one of a color and a width of the horizontal line, and the display device may display the horizontal line with the set color and width.

[0023] Furthermore, in the above-mentioned motion sickness reducing device, the display device may display an image including the horizontal line.

[0024] Furthermore, in the above-mentioned motion sickness reducing device, the display device may be provided on at least a part of a wall surface surrounding four sides of the riding space.

[0025] The motion sickness reduction method disclosed herein is a method for reducing motion sickness by displaying a horizontal line extending in a horizontal direction perpendicular to a gravity direction of a vehicle in a passenger space of the vehicle, regardless of the inclination of the vehicle.

[0026] With such a structure, it is possible to provide visual information to the person riding in a vehicle on how much the person is tilted relative to the horizontal (as a result, motion sickness caused by a sense of balance can be reduced).

[0027] This is because, in the passenger space of a vehicle having a passenger space for passengers, a horizontal line extending in a horizontal direction orthogonal to the gravity direction of the vehicle is displayed regardless of the inclination of the vehicle.

[0028] Effects of the Invention

[0029] According to the present disclosure, it is possible to provide a motion sickness reduction device and a motion sickness reduction method that can provide visual information to a person riding in a vehicle on how much the person is tilted relative to the horizontal (resulting in that motion sickness caused by a sense of balance can be reduced). BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 1 is a schematic diagram of a motion sickness reducing device 10 (film light source 20 ) installed in a passenger space of a vehicle V. FIG.

[0031] Figure 2A The front horizontal line HL displayed on the front film light source 20F when the vehicle V is not tilted (for example, when the vehicle V is on a horizontal plane) 20F Example.

[0032] Figure 2B The front horizontal line HL displayed on the front film light source 20F when the vehicle V is tilted to the left (for example, when traveling on a left curve) 20F Example.

[0033] Figure 2C The front horizontal line HL displayed on the front film light source 20F when the vehicle V is tilted to the right (for example, when traveling on a right curve) 20F Example.

[0034] Figure 3A The left horizontal line HL displayed on the left film light source 20L when the vehicle V is not tilted (for example, when the vehicle V is on a horizontal plane) 20L Example.

[0035] Figure 3BThe left horizontal line HL displayed on the left film light source 20L when the vehicle V is tilted backward (for example, when traveling uphill) 20L Example.

[0036] Figure 3C The left horizontal line HL displayed on the left film light source 20L when the vehicle V is tilted forward (for example, when traveling downhill) 20L Example.

[0037] Figure 4 This is a diagram for explaining the experimental environment performed by the present inventors.

[0038] Figure 5 This is a graph summarizing the results of a questionnaire survey conducted in an experiment performed by the present inventors.

[0039] Figure 6 This is another graph summarizing the results of a questionnaire survey conducted in an experiment performed by the present inventors.

[0040] Figure 7 2 is a structural diagram of the motion sickness reducing device 10 .

[0041] Figure 8 It is a diagram for explaining the X-axis and the Y-axis of the inertial sensor 40 mounted on the vehicle V.

[0042] Fig. 9 It is a diagram for explaining the outer shape of the film light source 20 .

[0043] Fig.10 This is a flowchart of horizontal line display processing 1.

[0044] Fig.11A This is an example of the horizontal line HL displayed as a result of the horizontal line display process 1 (and the horizontal line display process 2).

[0045] Fig. 11B This is an example of the horizontal line HL displayed as a result of the horizontal line display process 1.

[0046] Fig. 11C This is an example of the horizontal line HL displayed as a result of the horizontal line display process 2.

[0047] Fig.12 This is a flowchart of horizontal line display processing 2.

[0048] Fig.13 This is a flowchart of the highlight display process.

[0049] Fig.14A This is an example of a highlight display.

[0050] Fig. 14B This is an example of a highlight display.

[0051] Fig.15A This is a modified example of an object in which the film light source 20 is provided.

[0052] Fig. 15B This is a modified example of an object in which the film light source 20 is provided.

[0053] Fig.16 It is a structural diagram of a motion sickness reducing device 10 (variation).

[0054] Fig.17A This is a modified example of the display method of the horizontal line HL.

[0055] Fig. 17B This is a modified example of the display method of the horizontal line HL.

[0056] Fig.18 This is a modification example in which a liquid crystal panel 20A is used instead of the film light source 20 .

[0057] Fig.19 This is a variation of using a vehicle capable of autonomous driving as the means of transportation V. DETAILED DESCRIPTION

[0058] Hereinafter, the motion sickness reducing device 10 according to the embodiment of the present disclosure will be described with reference to the drawings. In each of the drawings, the same reference numerals are given to corresponding components, and duplicate descriptions are omitted.

[0059] Figure 1 1 is a schematic diagram of a motion sickness reducing device 10 (film light source 20 ) installed in a passenger space of a vehicle V. FIG.

[0060] like Figure 1 As shown, in order to reduce motion sickness, a motion sickness reduction device 10 is provided in a passenger space of a vehicle V (for example, see FIG. 2 ) having a passenger space in which one or more persons are seated. The motion sickness reduction device 10 includes a film light source 20 (an example of a display device disclosed in the present invention), and the film light source 20 displays a horizontal line HL extending in a horizontal direction orthogonal to the gravity direction of the vehicle V in the passenger space regardless of the inclination of the vehicle V. 20F , HL 20L , HL 20R (Refer to Figure 1 ). The vehicle V is, for example, a car. The film light source 20 is, for example, an organic EL or OP film. Figure 1 In the figure, reference numeral 80 indicates a driver's seat, reference numeral 81 indicates a passenger seat, and reference numeral 82 indicates a rear seat.

[0061] The film light source 20 is, for example, disposed on the front window glass FG, the side window glass SGL, and the side window glass SGR of the vehicle V. Hereinafter, the film light source 20 disposed on the front window glass FG is referred to as the front film light source 20F. Similarly, the film light source disposed on the side window glass SGL on the left is referred to as the left film light source 20L. Similarly, the film light source disposed on the side window glass SGR on the right is referred to as the right film light source 20R. In addition, when there is no particular distinction between them, they are simply referred to as the film light source 20.

[0062] In addition, the horizontal line HL displayed on the front film light source 20F is referred to as a front horizontal line HL 20F Similarly, the horizontal line HL displayed on the left film light source 20L is referred to as the left horizontal line HL 20L Similarly, the horizontal line HL displayed on the right film light source 20R is referred to as the right horizontal line HL 20R In addition, when not particularly distinguishing between them, they are simply referred to as horizontal lines HL.

[0063] Figure 2A The front horizontal line HL displayed on the front film light source 20F when the vehicle V is not tilted (for example, when the vehicle V is on a horizontal plane) 20F Example. Figure 2B The front horizontal line HL displayed on the front film light source 20F when the vehicle V is tilted to the left (for example, when traveling on a left curve) 20F Example. Figure 2C The front horizontal line HL displayed on the front film light source 20F when the vehicle V is tilted to the right (for example, when traveling on a right curve) 20F Example.

[0064] Figure 3A The left horizontal line HL displayed on the left film light source 20L when the vehicle V is not tilted (for example, when the vehicle V is on a horizontal plane) 20L Example. Figure 3B The left horizontal line HL displayed on the left film light source 20L when the vehicle V is tilted backward (for example, when traveling uphill) 20L Example. Figure 3C The left horizontal line HL displayed on the left film light source 20L when the vehicle V is tilted forward (for example, when traveling downhill) 20L In addition, although not shown in the figure, the right horizontal line HL 20R Also with the left horizontal line HL 20L The same is shown for the right film light source 20R.

[0065] like Figure 2A to Figure 2C , Figure 3A to Figure 3C As shown, the horizontal line HL (the front horizontal line HL 20F, left horizontal line HL 20L , right horizontal line HL 20R ) is the direction of gravity A of the vehicle V regardless of the inclination of the vehicle V. V The state extending in the orthogonal horizontal direction is shown by the light rays (lines formed by light) of the film light sources 20 (the front film light source 20F, the left film light source 20L, and the right film light source 20R).

[0066] The present inventors have confirmed through experiments that motion sickness can be reduced by displaying the horizontal line HL in the riding space of the vehicle V as described above.

[0067] Hereinafter, experiments conducted by the present inventors will be described.

[0068] Figure 4 This is a diagram for explaining the experimental environment performed by the present inventors.

[0069] The experiment was conducted using a car as a means of transportation. There were 45 subjects. Figure 4 As shown, the green horizontal line HL is projected by projectors PR1 to PR3. S1 , HL S2 , HL S3 The projection is placed on the subject TS ( Figure 4 In the example, the white screens S1 to S3 (screens that block the rear seat space) on the front and left and right sides of TS1 and TS2 are placed on the horizontal line HL. S1 , HL S2 , HL S3 This experiment was conducted twice in total under the environment of projecting onto the white screens S1 to S3 (screens that shield the passenger space of the rear seats). S1 , HL S2 and HL S3 The width of the projected horizontal line HL is about 1 cm. S1 , HL S2 , HL S3 The experiment conducted in an environment without projecting the horizontal line HL is called the "horizontal line experiment". S1 , HL S2 , HL S3 Experiments conducted in an environment without a horizon are called "experiments without a horizon".

[0070] In addition, in order to maintain the horizontal line HL S1 , HL S2 , HL S3 That is, no matter how the car tilts, it is always on the horizontal line HL S1 , HL S2 , HLS3 The projectors PR1 to PR3 are mounted on a stabilizer provided in the vehicle so as to form a horizontal line extending in a horizontal direction perpendicular to the gravity direction of the vehicle.

[0071] In the experiments with and without a horizontal line, the above-mentioned car drove at a speed of 40 km / h on the same road (a road with a total length of about 5 km, about 30 curves, and a height difference of about 40 m, and made three laps).

[0072] In each of the experiments with and without horizontal lines, each subject sat in the rear seat of a car traveling under the above conditions, read an article displayed on a handheld portable terminal (smartphone or tablet), and entered answers to a questionnaire displayed on the portable terminal every 2 minutes (their own motion sickness was rated on an 11-level scale of 0 to 10 (subjective evaluation)). In addition, in the experiment with horizontal lines, the intention was to use "light", i.e., horizontal lines HL displayed (projected) on screens S1 to S3, to monitor the peripheral vision of each subject. S1 , HL S2 , HL S3 to identify the level.

[0073] Figure 5 This is a graph summarizing the results of a questionnaire survey conducted in an experiment performed by the present inventors.

[0074] Figure 5 In the figure, the vertical axis represents the discomfort index, that is, an 11-step evaluation (subjective evaluation) of 0 to 10, and the horizontal axis represents the elapsed time (minutes) from the start of the experiment. Figure 5 In the figure, the meanings of the black circle(s), the white circle(s), the straight lines L1, L2, and the numerical values ​​"5.60" and "3.37" are as follows.

[0075] That is, the black circle (plural) represents the discomfort index (average value) in the experiment without a horizontal line, that is, the average value of the 11-stage evaluation (subjective evaluation) input by each subject in the experiment without a horizontal line. Straight line L1 represents an approximate straight line for the black circle (plural). On the other hand, the white circle (plural) represents the discomfort index (average value) in the experiment with a horizontal line, that is, the average value of the 11-stage evaluation (subjective evaluation) input by each subject in the experiment with a horizontal line. Straight line L2 represents an approximate straight line for the white circle (plural).

[0076] The value "5.60" represents the average value of the 11-level evaluation (discomfort index) input by each subject at the end (after 28 minutes) in the experiment without horizontal lines. On the other hand, the value "3.37" represents the average value of the 11-level evaluation (discomfort index) input by each subject at the end (after 28 minutes) in the experiment with horizontal lines.

[0077] Reference Figure 5 It can be seen that in the case of the experiment with the horizontal line, the discomfort index (average value) decreased from 5.60 to 3.37 compared with the case of the experiment without the horizontal line, that is, the improvement rate (average) is (3.37 / 5.60)×100≒60%. In addition, the reason for using the average values ​​of "5.60" and "3.37" of the 11-level evaluation (discomfort index) input by each subject at the end (after 28 minutes) is as follows. That is, it is believed that the state of motion sickness (discomfort) changes in a gradually increasing direction with the passage of time, so the average values ​​of "5.60" and "3.37" of the 11-level evaluation (discomfort index) input by each subject at the end (after 28 minutes) best reflect the state of motion sickness (discomfort).

[0078] Figure 6 This is another graph summarizing the results of a questionnaire survey conducted in an experiment performed by the present inventors.

[0079] Figure 6 The number “18%” and “there is a line-based effect (1.8≥)” indicate the proportion of subjects (8 people) whose difference ΔA (discomfort index A1-discomfort index A2) between the last 11-stage evaluation (hereinafter referred to as discomfort index A1) input in the experiment without horizontal lines (after 28 minutes) and the last 11-stage evaluation (hereinafter referred to as discomfort index A2) input in the experiment with horizontal lines (after 28 minutes) is 1.8 or more. Similarly, the number “7%” and “there is a line-based effect (1.8≥)” indicate the proportion of subjects (3 people) whose difference ΔA (discomfort index A1-discomfort index A2) is less than 1.8 and greater than 1. Similarly, the number “11%” and “there is a line-based effect (1<)” indicate the proportion of subjects (5 people) whose difference ΔA (discomfort index A1-discomfort index A2) is less than 1 and greater than 0. In addition, in Figure 6 In the example, effect = A1-A2 = +1.8 is described as "effect due to the line (1.8≥)", while no effect = A1-A2 = -1.8 is described as "no effect due to the line (1.8≥)".

[0080] Here, when the difference ΔA (discomfort index A1-discomfort index A2) is positive, it means that the discomfort index is reduced by displaying (projecting) the horizontal line HL. That is, when the difference ΔA (discomfort index A1-discomfort index A2) is positive, it means that motion sickness is reduced by displaying (projecting) the horizontal line HL.

[0081] Reference Figure 6It can be seen that the subjects whose difference ΔA (discomfort index A1-discomfort index A2) is positive, that is, the subjects whose motion sickness is reduced by displaying (projecting) the horizontal line HL are subjects with a difference ΔA of 1.8 or more (8 subjects), subjects with a difference ΔA of less than 1.8 and greater than 1 (3 subjects), and subjects with a difference ΔA of less than 1 and greater than 0 (5 subjects), totaling 16 people (about 36% of the total subjects).

[0082] The above experiments show that motion sickness can be reduced by displaying the horizontal line HL in the passenger space of the vehicle V (for example, the film light source 20 provided in the passenger space).

[0083] The reason why motion sickness can be reduced by displaying the horizontal line HL in the riding space of the vehicle V is considered to be as follows.

[0084] First, the causes of motion sickness are generally considered as follows. That is, when the vehicle (e.g., a car) is shaken forward, backward, left, right, up and down due to irregular acceleration and deceleration, repeated stops and starts, and driving on an undulating, curved road, the information input and transmitted to the brain through vision and the information input and transmitted to the brain from the inner ear (semicircular canals, otoliths) (e.g., body position, shaking, speed) are deviated. As a result, the brain cannot fully process the information, resulting in symptoms of motion sickness. (https: / / www.ssp.co.jp / aneron / cause / mechanism.html).

[0085] In contrast, as in the above experiment, by displaying a horizontal line HL in the passenger space of a vehicle, it is possible to suppress (or reduce) the deviation between the information inputted and transmitted to the brain through vision and the information inputted and transmitted to the brain from the inner ear (semicircular canals, otoliths) (e.g., body position, shaking, speed), and as a result, it is believed that motion sickness is reduced.

[0086] Next, a configuration example of the motion sickness reducing device 10 will be described.

[0087] The motion sickness reducing device 10 is mounted on a vehicle V. Hereinafter, an example in which the vehicle V is a car will be described.

[0088] Figure 7 2 is a structural diagram of the motion sickness reducing device 10 .

[0089] like Figure 7 As shown, the motion sickness reducing device 10 includes an ECU 30 (Electronic Control Unit), an inertial sensor 40 , an imaging device 50 , a navigation device 60 , and an interior light 70 .

[0090] The ECU 30 is a control device including, for example, a CPU, a RAM, and a ROM (not shown). The ECU 30 functions as a detection result acquisition unit 31, a vehicle tilt calculation unit 32, a horizontal line display unit 33, and a road condition detection unit 34 by the CPU executing a predetermined program read from the ROM to the RAM. In addition, some or all of these may be realized by hardware.

[0091] An inertial sensor 40 , an imaging device 50 , a navigation device 60 , and an interior lamp 70 are electrically connected to the ECU 30 .

[0092] The inertial sensor 40 is a sensor that detects the inertial force applied to the vehicle V (acceleration of each of the X-axis, Y-axis, and Z-axis, and angular velocity of each of the X-axis, Y-axis, and Z-axis). Figure 8 As shown, the X-axis extends in the front-rear direction of the vehicle V, the Y-axis extends in the width direction of the vehicle V, and the Z-axis extends in a direction orthogonal to the X-axis and the Y-axis. Figure 8 This is a diagram for explaining the X-axis and Y-axis of the inertial sensor 40 mounted on the vehicle V. As the inertial sensor 40, for example, a 6-axis IMU (Inertial Measurement Unit) or a 3-axis IMU can be used. The inertial sensor 40 can be one (reference) or multiple. The inertial sensor 40 is set at a position (optimal position) that takes into account the ability to detect the inertial force applied to the vehicle V (acceleration of each of the X-axis, Y-axis, and Z-axis, and angular velocity of each of the X-axis, Y-axis, and Z-axis).

[0093] The imaging device 50 is a camera (including an imaging element such as a CCD sensor or a CMOS sensor) that captures images in front of the vehicle V and is installed at a predetermined location (eg, a passenger space) of the vehicle V. Images (image data) captured by the imaging device 50 are input to the ECU 30 .

[0094] Although not shown, the navigation device 60 includes a route search unit, a route navigation guidance unit, a current position detection unit, a map information storage unit, and the like. The route search unit searches for a route from a departure point (e.g., the current position of the vehicle V) to a destination of the vehicle V based on the map information stored in the map information storage unit. The route navigation guidance unit provides guidance on the route searched by the route search unit. The current position detection unit detects the current position of the vehicle V based on a signal from a GPS (not shown) provided in the vehicle V. The map information storage unit stores map information.

[0095] The detection result acquisition unit 31 acquires the detection result (acceleration of each of the X-axis, Y-axis, and Z-axis, and angular velocity of each of the X-axis, Y-axis, and Z-axis) of the inertial sensor 40 from the inertial sensor 40 .

[0096] The vehicle inclination calculation unit 32 calculates the inclination (roll angle φ, pitch angle θ, etc.) of the vehicle V based on the detection result obtained by the detection result acquisition unit 31. Figure 8 ).

[0097] The horizontal line display unit 33 generates a horizontal line HL based on the inclination (roll angle φ, pitch angle θ, etc.) of the vehicle V calculated by the vehicle inclination calculation unit 32, and displays the generated horizontal line HL on the film light source 20 by controlling the control circuit 71. The width W1 of the horizontal line HL (see Figure 2A ), length LE1~LE3 (refer to Figure 2A , Figure 3A ) can be an appropriate width and length. In addition, the color and brightness (brightness) of the horizontal line HL can be an appropriate color and brightness. The color of the horizontal line HL can be a single color or multiple colors.

[0098] The road condition detection unit 34 detects the road condition on which the vehicle V is traveling (such as the road condition corresponding to the current position of the vehicle V) based on the information input from the imaging device 50 and the navigation device 60 .

[0099] The interior lamp 70 includes a control circuit 71 and a film light source 20 .

[0100] The control circuit 71 controls the film light source 20 in accordance with the control from the ECU 30 so that the horizontal line HL generated by the horizontal line display unit 33 is displayed on the film light source 20 .

[0101] The film light source 20 is a film-shaped film light source (display) that displays the horizontal line HL and is provided in the passenger space. The film light source 20 is an example of a display device disclosed in the present invention. As the film light source 20, for example, an organic EL (including an organic LED) or a film-shaped LED can be used. The film-shaped LED is a film light source that includes a plurality of semiconductor light-emitting elements that are fixed in a state of being two-dimensionally (or three-dimensionally) arranged on a flexible film.

[0102] like Figure 1 As shown, the film light source 20 (front film light source 20F, left film light source 20L, right film light source 20R) is provided, for example, on the front window glass FG, side window glasses SGL, SGR of the vehicle V constituting the wall surface surrounding the passenger space. Fig. 9 As shown, the outer shape of the film light source 20 is, for example, a rectangular shape. Fig. 9 This is a diagram for explaining the appearance of the film light source 20. A reflective film (semi-transparent and semi-reflective mirror, white film, milky film) may be laminated on the back of the film light source 20. In addition, a part of the front window glass FG, the side window glass SGL, and the SGR may be milky white. In addition, the film light source 20 may also be provided on the rear window glass (not shown) constituting the wall surface surrounding the passenger space.

[0103] Next, the horizontal line display process 1 will be described.

[0104] Fig.10 This is a flowchart of horizontal line display processing 1. Fig.11A , Fig. 11B This is an example of the horizontal line HL displayed as a result of the horizontal line display process 1.

[0105] Hereinafter, as a horizontal line display process 1, a process of displaying a horizontal line HL on the film light source 20 when the vehicle V is tilted to the right (toward the right in front of the vehicle V) by an angle +φ (hereinafter referred to as the roll angle +φ. See FIG. 2 ) will be described. Hereinafter, for the sake of simplicity, only the roll angle +φ is considered, and the pitch angle θ is not considered.

[0106] First, the road condition is detected (step S10 ). This is achieved by the road condition detection unit 34 .

[0107] Next, it is determined whether the road condition detected in step S10 satisfies a predetermined condition (step S11). This is achieved by the ECU 30 executing a predetermined program. The predetermined condition is a condition for determining whether the road condition detected in step S10 (the road currently being traveled or the road to be traveled thereafter) is a road condition that may induce motion sickness, such as a slope (a slope with a slope of a certain gradient or more), a curved road (a curved road with a curvature of a certain curvature or more), or a straight road traveling at an acceleration of less than a predetermined acceleration force.

[0108] As a result, when it is determined that the road condition detected in step S10 satisfies the predetermined condition (step S11 : Yes), the processing from step S12 onwards is executed.

[0109] Next, the detection result output by the inertial sensor 40 is acquired (step S12 ). This is achieved by the detection result acquisition unit 31 .

[0110] Next, the roll angle is calculated (step S13). This is achieved by the vehicle tilt calculation unit 32. Here, the vehicle V is tilted to the right (toward the right in front of the vehicle V) (refer to Figure 2C ), calculate the roll angle +φ.

[0111] Next, it is determined whether the roll angle exceeds a threshold value (step S14). This is achieved by the ECU 30 executing a predetermined program.

[0112] As a result, when it is determined that the roll angle +φ does not exceed the threshold value (step S14: No), that is, when the vehicle V is almost not tilted to the left or right, the horizontal line HL is displayed on the film light source 20 (step S15). Fig.11AAs shown, the front film light source 20F displays a line passing through the reference center point CP and the reference horizontal line AX. H The front horizontal line HL extending parallel to 20F Similarly, the left film light source 20L displays a line passing through the reference center point CP and parallel to the reference horizontal line AX. H The left horizontal line HL extending parallel to 20L Similarly, the right film light source 20R displays a line passing through the reference center point CP and parallel to the reference horizontal line AX. H The right horizontal line HL extending parallel to 20R .

[0113] On the other hand, if the result of the determination in step S14 is that the roll angle φ exceeds the threshold value (step S14: Yes), that is, if the vehicle V is tilted to the right (or left) (see Figure 2C ),like Fig. 11B As shown, the front film light source 20F displays the tilt angle +φ (reference Figure 2C ) is oppositely tilted at an angle -φ (refer to Fig. 11B )'s front horizontal line HL 20F (Step S16).

[0114] Next, the left film light source 20L displays the horizontal line HL 20F The left end of the continuous left horizontal line HL 20L (Step S17). Left horizontal line HL 20L Equivalent to Fig.11A The left horizontal line HL shown 20L From the reference horizontal line AX H Line after downward shifting. In addition, BL is the distance between the reference center point CP and the boundary L (the boundary between the left film light source 20L and the front film light source 20F).

[0115] Next, the right film light source 20R displays the same horizontal line HL as the front horizontal line HL. 20F The right end of the continuous right horizontal line HL 20R (Step S18). Right horizontal line HL 20R Equivalent to Fig.11A The right horizontal line HL shown 20R From the reference horizontal line AX H Line shifted upward. In addition, BR is the distance between the reference center point CP and the boundary R (the boundary between the right film light source 20R and the front film light source 20F).

[0116] The processing of steps S12 to S18 described above is repeatedly performed while the road condition detected in step S10 satisfies a predetermined condition (while the determination result in step S11 is YES).

[0117] Next, the horizontal line display process 2 will be described.

[0118] Fig.12 This is a flowchart of horizontal line display processing 2. Fig.11A , Fig. 11C This is an example of the horizontal line HL displayed as a result of the horizontal line display process 2.

[0119] Next, as the horizontal line display processing 2, the vehicle V is tilted forward by an angle -θ (hereinafter referred to as the pitch angle -θ. Figure 3C ) will be described below, in which the film light source 20 displays the horizontal line HL. In order to simplify the description, only the pitch angle -θ is considered, and the roll angle φ is not considered.

[0120] First, the road condition is detected (step S20 ). This is achieved by the road condition detection unit 34 .

[0121] Next, it is determined whether the road condition detected in step S20 satisfies a predetermined condition (step S21). This is achieved by the ECU 30 executing a predetermined program. The predetermined condition is a condition for determining whether the road condition detected in step S20 (the road currently being traveled or the road to be traveled thereafter) is a road condition that may induce motion sickness, such as a slope (a slope with a slope of a certain gradient or more), a curved road (a curved road with a curvature of a certain curvature or more), or a straight road traveling at an acceleration of less than a predetermined acceleration force.

[0122] As a result, when it is determined that the road condition detected in step S20 satisfies the predetermined condition (step S21 : Yes), the processing from step S22 onwards is executed.

[0123] Next, the detection result output by the inertial sensor 40 is acquired (step S22 ). This is achieved by the detection result acquisition unit 31 .

[0124] Next, the pitch angle θ is calculated (step S23). This is achieved by the vehicle inclination calculation unit 32. Here, it is assumed that the vehicle V is tilted forward (refer to Figure 3C ) to calculate the pitch angle -θ.

[0125] Next, it is determined whether the pitch angle θ exceeds a threshold value (step S24). This is achieved by the ECU 30 executing a predetermined program.

[0126] As a result, when it is determined that the pitch angle θ does not exceed the threshold value (step S24: No), that is, when the vehicle V is almost not tilted forward or backward, the horizontal line HL is displayed on the film light source 20 (step S25). Fig.11AAs shown, the front film light source 20F displays a line passing through the reference center point CP and the reference horizontal line AX. H The front horizontal line HL extending parallel to 20F Similarly, the left film light source 20L displays a line passing through the reference center point CP and parallel to the reference horizontal line AX. H The left horizontal line HL extending parallel to 20L Similarly, the right film light source 20R displays a line passing through the reference center point CP and parallel to the reference horizontal line AX. H The right horizontal line HL extending parallel to 20R .

[0127] On the other hand, if the result of the determination in step S24 is that the pitch angle θ exceeds the threshold value (step S24: Yes), that is, if the vehicle V is tilted forward (or backward), Fig. 11C As shown, the front horizontal line HL is displayed on the front film light source 20F. 20F (Step S26). The front horizontal line HL shown here 20F Through the datum center point CP and relative to the datum horizontal line AX H extend in parallel.

[0128] Next, the left film light source 20L displays the horizontal line HL 20F The left end is continuous and with the pitch angle -θ (refer to Figure 3C ) is also tilted by an angle -θ (refer to Fig. 11C )'s left horizontal line HL 20L (Step S27).

[0129] Next, the right film light source 20R displays the same horizontal line HL as the front horizontal line HL. 20F The right end is continuous and with the pitch angle -θ (refer to Figure 3C ) is also tilted by an angle -θ (refer to Fig. 11C )'s right horizontal line HL 20R (Step S28).

[0130] The processing of steps S22 to S28 described above is repeatedly performed while the road condition detected in step S20 satisfies a predetermined condition (while the result of determination in step S21 is YES).

[0131] In the above, the horizontal line display process 1 and the horizontal line display process 2 are described separately, but the two processes may be executed simultaneously. In addition to these processes, the next bright spot display process may be executed.

[0132] Next, the bright spot display processing is described.

[0133] The bright spot display process is to display a bright spot BP moving in a direction corresponding to the acceleration or deceleration of the vehicle V along the horizontal line HL displayed in the horizontal line display process 1 or the horizontal line display process 2 (see Fig.14A , Fig. 14B ) processing.

[0134] Fig.13 This is a flowchart of the highlight display process. Fig.14A , Fig. 14B This is an example of a highlight display.

[0135] Fig.13 The highlight display process shown is for example Fig.12 Steps S25 and S28 are then executed.

[0136] First, the detection result output by the inertial sensor 40 is acquired (step S30 ). This is achieved by the detection result acquisition unit 31 .

[0137] Next, it is determined whether the acceleration exceeds a threshold value (step S31), and if it is determined that the acceleration exceeds the threshold value, it is further determined whether it is acceleration or deceleration (step S32). This is achieved by the ECU 30 executing a predetermined program.

[0138] As a result, if it is determined to be accelerated (step S32: acceleration), Fig.14A As shown, the following bright spot BP is displayed on the film light source 20 together with the horizontal line HL (refer to Fig. 14B ), the bright spot BP moves along the horizontal line HL in a direction corresponding to the acceleration of the vehicle V, for example, from the rear ends of the left film light source 20L and the right film light source 20R to the end point in the center of the front film light source 20F (refer to Fig.14A middle arrow) to move.

[0139] On the other hand, if it is determined to be deceleration (step S32: deceleration), Fig. 14B As shown, together with the horizontal line HL, the following bright spot BP is shown (refer to Fig. 14B ), the bright spot BP moves along the horizontal line HL in a direction corresponding to the deceleration of the vehicle V, for example, from the center of the front film light source 20F to the end point of the rear end of the left film light source 20L and the right film light source 20R (refer to Fig. 14B middle arrow) to move.

[0140] The processing of steps S30 to S34 described above is repeatedly executed while the road condition detected in step S20 satisfies a predetermined condition (while the determination result in step S21 is YES).

[0141] By moving the bright spot BP in accordance with the body sense in this way, information is given to vision in the same way as the otoliths that sense linear acceleration, and it is expected that motion sickness felt during acceleration and deceleration can be reduced.

[0142] In addition, contrary to the above, when it is determined to be accelerated (step S32: acceleration), if Fig. 14B As shown, the following bright spot BP can also be displayed together with the horizontal line HL (refer to Fig. 14B ), the bright spot BP, for example, starts from the center of the front film light source 20F and moves toward the end point of the rear end of the left film light source 20L and the right film light source 20R (refer to Fig. 14B Similarly, contrary to the above, when it is determined to be decelerating (step S32: decelerating), as Fig.14A As shown, the following bright spot BP can also be displayed on the film light source 20 together with the horizontal line HL (refer to Fig. 14B ), the bright spot BP, for example, starts from the rear end of the left film light source 20L and the right film light source 20R and moves toward the center of the front film light source 20F (refer to Fig.14A In the present embodiment, the moving direction of the bright spot is specified by acceleration and deceleration, but depending on the conditions of the passengers and the road, it is sometimes better to move in the opposite direction.

[0143] As described above, according to the present embodiment, it is possible to provide a person riding in the vehicle V with visual information on how much the person is tilted relative to the horizontal (as a result, motion sickness caused by a sense of balance can be reduced).

[0144] This is because, in the passenger space of the vehicle V having the passenger space for passengers, the horizontal line HL extending in the horizontal direction orthogonal to the gravity direction of the vehicle V is displayed regardless of the inclination of the vehicle V.

[0145] Furthermore, by displaying the horizontal line HL, a person riding in the vehicle V can predict the movement of the vehicle V, and thus can naturally take a posture with respect to the movement of the vehicle V. Furthermore, a person riding in the vehicle V can be given a sense of security.

[0146] Next, modified examples will be described.

[0147] Fig.15A , Fig. 15B This is a modified example of the location where the film light source 20 is provided.

[0148] In the above-described embodiment, the film light source 20 is provided on the front windshield FG and the side windshields SGL and SGR of the vehicle V constituting the wall surface surrounding the passenger space (see Figure 1 ) is described, but is not limited thereto. For example, Fig.15A As shown, the film light source 20 may also be disposed on the front instrument panel or the side door disposed in the passenger space. Fig. 15B As shown, the film light source 20 may also be further disposed on the rear seats (eg, the rear surface of the front seats, the rear instrument panel).

[0149] Fig.16 It is a structural diagram of a motion sickness reducing device 10 (variation).

[0150] like Fig.16 As shown, the motion sickness reduction device 10 may also include a horizontal line setting unit 35. The horizontal line setting unit 35 sets at least one of the color and width of the horizontal line HL through the operation of the user. In addition, the horizontal line setting unit 35 may set the brightness (brightness) of the horizontal line HL through the operation of the user. Although not shown in the figure, the horizontal line HL is displayed in the film light source 20 with the color, width, and brightness (brightness) set by the horizontal line setting unit 35.

[0151] Fig.17A , Fig. 17B This is a modified example of the display method of the horizontal line HL.

[0152] like Fig.17A As shown, a background color or a background image BG may also be displayed together with the horizontal line HL on the film light source 20. The background image BG may be a still image or a dynamic image.

[0153] In addition, if Fig. 17B As shown, an image G including the horizon line HL, for example, an image of a natural environment including a horizon corresponding to the horizon line HL, may be displayed on the film light source 20. The image G may be a still image or a dynamic image. In this way, it is expected that motion sickness can be reduced while suppressing the excitement of the nerves.

[0154] In addition, in the above embodiment, an example of using a car as the transportation tool V is described, but the present invention is not limited to this. That is, the transportation tool V can be any structure as long as it has a passenger space for one or more people to ride, for example, it can be a vehicle other than a car, such as a bus, a vehicle capable of automatic driving, a ship, a bus, a train, an airplane, or a spacecraft.

[0155] Fig.18 This is a modification example in which a liquid crystal panel 20A is used instead of the film light source 20 .

[0156] For example, in the case of using a vehicle capable of autonomous driving as a means of transportation V, such as Fig.18As shown, a liquid crystal panel 20A may be provided instead of the film light source 20 so as to cover the entire area of ​​the front windshield FG and the side windshields SGL and SGR of the vehicle V constituting the wall surface surrounding the passenger space.

[0157] In this way, in addition to displaying the horizontal line HL, the light environment of the entire passenger space can also be controlled. For example, in addition to displaying the horizontal line HL (for example, green) on the liquid crystal panel 20A, a color that stabilizes nerves (for example, black) is also displayed on its background, thereby controlling the light environment of the entire passenger space. In this way, it can be expected that the activities of the sympathetic nerves and parasympathetic nerves can be controlled to further reduce the symptoms of motion sickness. In addition, the excitement of the nerves can also be suppressed.

[0158] In addition, in the above-mentioned embodiment, an example of using the film light source 20 as a display device is described, but it is not limited to this. That is, the display device can be any structure as long as it can display the horizontal line HL. For example, it can be a liquid crystal display installed in the passenger space, a projector that projects the horizontal line HL on a screen installed in the passenger space (for example, a wall surface surrounding the passenger space), and an aerial visible image drawing device that displays (draws) the horizontal line HL in the passenger space itself. In addition, the representation medium of the horizontal line HL can be installed in the passenger space. That is, there is no limitation on the surface and position of the representation medium of the horizontal line HL.

[0159] In the above-described embodiment, when it is determined that the road condition satisfies the predetermined condition (step S11: Yes), the processing from step S12 onwards is executed (see Fig.10 ) is described, but is not limited to this. For example, when a person riding in the vehicle V turns on a horizontal line display switch (not shown) provided in the passenger space, the processing from step S12 onwards may also be executed. Similarly, in the case where it is determined that the road condition satisfies a predetermined condition (step S21: Yes), the processing from step S22 onwards is executed (see Fig.12 ) is described, but is not limited to this. For example, when a person riding in the vehicle V turns on a horizontal line display switch (not shown) set in the riding space, the processing below step S22 can also be performed.

[0160] Fig.19 This is a variation of using a vehicle capable of autonomous driving as the means of transportation V.

[0161] In the above embodiment, an example is described in which the horizontal line HL is displayed on a part of the wall surface surrounding the passenger space (the front window glass FG and the side window glasses SGL and SGR of the vehicle V constituting the wall surface) (see Figure 1), but not limited to this. The front window glass refers to the glass or wall surface on the side of the vehicle V in the direction of travel, the side window glass refers to the glass or wall surface on the vehicle width direction side (or the horizontal direction side at right angles to the direction of travel) of the vehicle V, and the rear window glass refers to the glass or wall surface on the side opposite to the direction of travel of the vehicle V. The front window glass and the like may be made of materials other than glass, for example, other materials such as polycarbonate plastic. In addition, it may be an opaque material, a light-transmitting colored material, or an opaque colored material.

[0162] For example, Fig.19 As shown, when a vehicle capable of automatic driving is used as the transportation means V, the horizontal line HL may be displayed on the entire circumference of the wall surface surrounding the riding space. Fig.19 1 is a diagram (schematic diagram) showing a vehicle V (a vehicle capable of automatic driving) traveling on a slope.

[0163] The numerical values ​​shown in the above-mentioned embodiments are all examples, and it is of course possible to use appropriate numerical values ​​different from them.

[0164] The above-mentioned embodiments are merely illustrative in all aspects. The present disclosure is not to be interpreted restrictively by the description of the above-mentioned embodiments. The present disclosure can be implemented in various other forms without departing from the spirit or main features thereof.

[0165] This application claims the benefit of priority based on Japanese patent application No. 2022-117739, filed on July 25, 2022, the disclosure of which is incorporated herein in its entirety.

[0166] Description of Reference Numerals

[0167] 10…Reduction device

[0168] 20…Film light source (display device)

[0169] 20A…LCD panel

[0170] 20F...front film light source

[0171] 20L...Left film light source

[0172] 20R…Right film light source

[0173] 30…ECU

[0174] 31…Test result acquisition section

[0175] 32…Vehicle inclination calculation unit

[0176] 33…Horizontal line display unit

[0177] 34…Road Condition Monitoring Department

[0178] 35…Horizontal line setting unit

[0179] 40…Inertial Sensors

[0180] 50…Camera device

[0181] 60…Navigation device

[0182] 70…Interior lights

[0183] 71…Control circuit

[0184] A V …direction of gravity

[0185] AX H ...base level

[0186] BG… Background Image

[0187] BP…Highlights

[0188] CP…Center Point

[0189] FG: front window glass

[0190] G…Image

[0191] HL…Horizontal Line

[0192] HL 20F ...front horizontal line

[0193] HL 20L ...left horizontal line

[0194] HL 20R ...right horizontal line

[0195] HL S1 ~HL S3 …horizontal line

[0196] PR1~PR3…Projector

[0197] S1~S3…Screen

[0198] SGL, SGR…Side window glass

[0199] TS…Experimented

[0200] V…Transportation

[0201] θ…Pitch angle

[0202] φ…Roll angle

Claims

1. A motion sickness reduction device, wherein: The motion sickness reduction device includes a display device, which is arranged in the passenger space of a vehicle having a passenger space for people to sit in, and displays a horizontal line extending in a horizontal direction orthogonal to the gravity direction of the vehicle in the passenger space regardless of the inclination of the vehicle.

2. The motion sickness reduction device according to claim 1, wherein: The motion sickness reduction device further includes a road condition detection unit, the road condition detection unit detecting the road condition on which the vehicle is traveling. The display device displays the horizontal line when the road condition satisfies a predetermined condition.

3. The motion sickness reduction device according to claim 2, wherein: The predetermined condition is a slope, a curved road, or a straight road where the vehicle is traveling at an acceleration equal to or less than a predetermined acceleration force.

4. The motion sickness reducing device according to claim 1, wherein: The display device displays, together with the horizontal line, a bright spot that moves along the horizontal line in a direction corresponding to the acceleration or deceleration of the vehicle.

5. The motion sickness reducing device according to any one of claims 1 to 4, wherein: The display device is provided on a front window glass and a side window glass constituting a wall surface surrounding the passenger space.

6. The motion sickness reducing device according to claim 5, wherein: The display device is further provided on a rear window glass constituting a wall surface surrounding the passenger space.

7. The motion sickness reducing device according to any one of claims 1 to 4, wherein: The display device is installed on a front instrument panel or a side door provided in the passenger space.

8. The motion sickness reducing device according to claim 7, wherein: The display device is further provided on a rear instrument panel provided in the passenger space.

9. The motion sickness reducing device according to claim 1, wherein: The display device is a film-shaped film light source.

10. The motion sickness reducing device according to claim 9, wherein: The film light source is an organic EL or a film-shaped LED.

11. The motion sickness reducing device according to claim 1, wherein: The display device is a liquid crystal display installed in the riding space, or a projector that projects the horizontal line on a screen installed in the riding space.

12. The motion sickness reducing device according to claim 1, wherein: The motion sickness reduction device further includes a horizontal line setting unit that sets at least one of a color and a width of the horizontal line. The display device displays the horizontal line with the set color and width.

13. The motion sickness reducing device according to claim 1, wherein: The display device displays an image including the horizontal line.

14. The motion sickness reducing device according to claim 1, wherein: The display device is provided on at least a portion of a wall surface surrounding the passenger space on all sides.

15. A method for reducing motion sickness, wherein: In the passenger space of a vehicle having a passenger space for passengers, a horizontal line extending in a horizontal direction perpendicular to a gravity direction of the vehicle is displayed regardless of the inclination of the vehicle.

Images