Road surface projection device

Abstract

To easily provide information about the surroundings of the vehicle. [Solution] The road surface projection device 1 is installed on a vehicle and projects an image onto the road surface. The road surface projection device 1 includes a projection light output means 40 that outputs projection light for projecting an image onto the road surface, a control means 10 that controls the projection light output means 40 to adjust the projection light, and a tilt detection means 30 that detects the tilt of the vehicle. When the tilt detection means 30 detects the tilt of the vehicle, the control means 10 controls the projection light output means 40 to adjust the projection light so that the projection image is projected onto the projection range outside the tilted vehicle.

Description

Technical Field

[0001] The present disclosure relates to a road surface projection apparatus, and more particularly to a road surface projection apparatus that is installed on a vehicle and projects a projection image onto a road surface.

Background Art

[0002] Conventionally, an area marker lamp in which a lamp is installed on a two-wheeled vehicle and a predetermined marker is projected onto a road surface around the two-wheeled vehicle has been known (see, for example, Patent Document 1). For example, lamp units are arranged at four positions: front right side, rear right side, front left side, and rear left side of the two-wheeled vehicle, and by irradiating the road surface with light output from each lamp unit, a predetermined marker can be projected onto the road surface.

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] However, there is a demand not only for projecting a marker onto a road surface but also for providing notification to surrounding vehicles and the like.

[0005] The present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide a road surface projection apparatus capable of easily providing notification to the surroundings of the own vehicle.

Means for Solving the Problem

[0006] To solve the above problems, the road surface projection device of the present disclosure is a road surface projection device installed on a vehicle that projects a projection image onto a road surface, comprising: projection light output means for outputting projection light for projecting the projection image onto the road surface; control means for controlling the projection light output means to adjust the projection light; and tilt detection means for detecting the tilt of the vehicle, wherein the control means controls the projection light output means to adjust the projection light so that when the tilt of the vehicle is detected by the tilt detection means, the projection image is projected onto a projection range outside the tilted vehicle.

[0007] Here, the "outside of a tilted vehicle" refers to the side where the angle between the vehicle and the road surface is 90 degrees or more when the vehicle is tilted (i.e., when the vehicle is leaning towards the road surface). [Effects of the Invention]

[0008] The road surface projection device of this disclosure makes it possible to easily provide notifications to the surroundings of the vehicle. [Brief explanation of the drawing]

[0009] [Figure 1A] This is a side view showing a motorcycle on which the road surface projection device according to the embodiment is installed. [Figure 1B] This is a plan view showing a motorcycle on which the road surface projection device according to the embodiment is installed. [Figure 2] This is a block diagram showing the schematic configuration of the road surface projection device according to the embodiment. [Figure 3] This figure shows a schematic configuration of a projector unit according to an embodiment. [Figure 4A] This is a rear view showing the motorcycle in motion, with the projected image onto the road surface. [Figure 4B] Figure 4A shows how the projection range and content information have changed. [Figure 4C] Figure 4B shows how the projection range and content information have changed. [Figure 4D]This figure shows the expanded projection range of the inner area shown in Figure 4C. [Figure 5] This is a front view showing the motorcycle in motion, with a projection of the road surface onto it. [Figure 6] This diagram shows a situation where the projection range of the projected light on the road surface extends to the oncoming lane. [Modes for carrying out the invention]

[0010] An example of the road surface projection device described herein will be shown and explained in detail with reference to the drawings. Figures 1A and 1B show a motorcycle on which the road surface projection device is installed. As shown in Figure 1A, the road surface projection device 1 is attached to the bottom surface of the central part of the motorcycle (vehicle) 100. The road surface projection device 1 is provided with a projection port for outputting projection light L onto the road surface G, as will be described later. The road surface projection device 1 is installed on the motorcycle 100 so that the projection port faces directly below the motorcycle 100. By outputting projection light L from the projection port, as shown in Figure 1B, it is possible to project a projection image onto the road surface G around the entire circumference of the motorcycle 100 (excluding the part that is in shadow due to the tires).

[0011] Figure 2 is a block diagram showing the schematic configuration of the road surface projection device 1. The road surface projection device 1 includes a control unit (control means) 10, a recording unit 20, a tilt sensor (tilt detection means) 30, and a projector unit (projection light output means) 40. The tilt sensor 30 is a sensor that detects the tilt state of the motorcycle 100 during driving (for example, the state in which the motorcycle 100 is banked relative to the road surface G, hereinafter referred to as the tilt state). For example, an acceleration sensor can be used as the tilt sensor 30. Information regarding the tilt of the motorcycle 100 detected by the tilt sensor 30 (tilt information) is output to the control unit 10.

[0012] The recording unit 20 records information (content information) related to the content projected onto the road surface G by the projector unit 40. Examples of content information recorded in the recording unit 20 include text information such as "Caution!" and "CAUTION!", direction indicator images consisting of arrows that inform surrounding vehicles of the direction of travel of the motorcycle 100, and navigation guidance images that inform the driver of the motorcycle 100 of the direction to turn next. Information regarding brightness, color, etc., necessary for projecting the content information onto the road surface G is also recorded.

[0013] Figure 3 shows a schematic configuration of the projector unit 40. The projector unit 40 has a picture generation unit 60, a projection lens 70, and a projection mirror 80, and is housed in a housing 90. The picture generation unit 60 has a light source unit 61, a condenser lens 62, a lenticular lens 63, a diffuser plate 64, and a TFT unit 65. The light source unit 61 is composed of a plurality of LEDs (Light Emitting Diodes) arranged on a circuit board, and turns the LED light on and off based on instructions from the control unit 10.

[0014] The TFT section 65 is composed of a TFT liquid crystal display (thin-film-transistor liquid-crystal display) and displays content information (text information, image information, etc.) of the projected image to be projected onto the road surface G based on instructions from the control unit 10. When LED light is output from the light source section 61, the optical components 66, consisting of a condenser lens 62, a lenticular lens 63, and a diffuser plate 64, equalize the light transmitted through them.

[0015] The light transmitted through the optical member 66 irradiates the back surface of the TFT section 65, and the light transmitted through the TFT section 65 is output toward the projection lens 70 as light having content information displayed on the TFT section 65. The projection lens 70 appropriately magnifies and forms an image of the light output from the image generation unit 60, and outputs the light to the projection mirror 80. The projection mirror 80 reflects the light that has passed through the projection lens 70 and projects it onto the road surface G via the projection opening 92 provided in the housing 90. The light projected onto the road surface G corresponds to the projection light L.

[0016] The projector unit 40 is a short-focus unit. The projection light L output from the projector unit 40 is in focus within a range of about 40 cm to 100 cm from the projection opening 92. For this reason, even if the motorcycle 100 is tilted, there is no need to move the projector unit 40 or the projection lens 70, and the projected image (content information) of the projection light L projected onto the road surface G is visually recognized on the road surface G in a focused state. Note that the image generation unit 60 and the projection lens 70 can move closer to or farther from the projection mirror 80 based on the control of the control unit 10. By bringing the image generation unit 60 and the projection lens 70 closer to the projection mirror 80, it is possible to move the focus toward the side closer to the projection opening 92.

[0017] The control unit 10 adjusts the projection light L projected onto the road surface G. The control unit 10 determines the tilt state of the motorcycle 100 by acquiring tilt information from the tilt sensor 30. Further, the control unit 10 reads the content information of the projection image to be projected onto the road surface G from the recording unit 20, and causes the TFT section 65 of the projector unit 40 to display the read content information. Furthermore, the control unit 10 controls the light source section 61 to emit LED light. The control unit 10 adjusts the projection light L projected onto the road surface G by controlling the content information (information displayed on the liquid crystal surface) displayed on the TFT section 65 in accordance with the tilt state of the motorcycle 100.

[0018] For example, the brightness of content information displayed on the TFT unit 65 (information displayed on the liquid crystal surface) is increased only in a portion corresponding to the left half of the projection range of the projection light L projected onto the road surface G, and is decreased only in a portion corresponding to the right half of the projection range. By adjusting the brightness of the projection light L, among the projection range of the projection image projected onto the road surface G, only the projection range on the left side of the motorcycle 100 can be brightened, and the projection range on the right side can be darkened. Further, for example, among the content information displayed on the TFT unit 65, the content information in a portion corresponding to a 1 / 3 range from the left side (the left side relative to the motorcycle 100) of the projection range of the projection image projected onto the road surface G is completely darkened (for example, a black image or the like is displayed), and the content information is displayed only in a portion corresponding to a 2 / 3 range from the right side of the projection range (that is, a range other than the 1 / 3 range from the left side of the projection image). By this adjustment of the projection range, the projection range of the projection image projected on the left side of the motorcycle 100 can be made narrower than the projection range of the projection image projected on the right side (the left projection range can be made 1 / 3 of the right projection range). In this way, the projection range of the projection image can be widened or narrowed.

[0019] Further, by applying gradation processing to the content information displayed on the TFT unit 65 (information displayed on the liquid crystal surface) in which the brightness decreases as progressing from the left side to the right side of the content information, the projection image can be adjusted such that the brightness of the projection image projected onto the road surface G gradually darkens from the left to the right of the motorcycle 100.

[0020] Further, as described above, the projection image projected onto the road surface G is set to be in focus within a range of about 40 cm to 100 cm from the projection port 92. Therefore, even when the distance from the projection port 92 to the road surface G changes in accordance with the inclined state of the motorcycle 100, an in-focus projection image can be projected onto the road surface G without being affected by the inclined state of the motorcycle 100.

[0021] Next, a case where the control unit 10 adjusts the projection image projected onto the road surface G by controlling the content information displayed on the TFT unit 65 in accordance with the inclined state of the motorcycle 100 will be described with a specific example.

[0022] Figure 4A is a rear view of the motorcycle 100 showing how the road surface projection device 1 projects an image onto the road surface G while the motorcycle 100 is in motion. It is desirable that the process of projecting the image onto the road surface G by the road surface projection device 1 be performed during a time when the projected image is easily visible from the surroundings, for example, from evening to the following morning. During this time, the projected image on the road surface G is easily visible to drivers of surrounding vehicles, etc., and the presence of the motorcycle 100 can be effectively communicated to the surroundings. In particular, in the road surface projection device 1 according to the embodiment, as shown in Figure 1B, the projected image can be projected all around the motorcycle 100, so that the presence of the motorcycle 100 can be recognized regardless of the position of drivers of other vehicles, etc.

[0023] Figure 4A shows the state in which the text information (content information, projected image) "CAUTION" is projected across the rearward position in the inner projection range S1 and the rearward position in the outer projection range S2 of the projected light L projected onto the road surface G. The text information is displayed by forming it with cutout characters that are omitted (not displayed) in the inner projection range S1 and the outer projection range S2, or by forming it with a different color from the inner projection range S1 and the outer projection range S2. Specifically, the letters "CAU" are projected in the outer projection range S2 of the inclined motorcycle 100, and the letters "TION" are projected in the inner projection range S1. By projecting the text information "CAUTION" at the rearward position in projection ranges S1 and S2, it is possible to alert drivers of vehicles traveling behind the motorcycle 100.

[0024] As shown in Figure 4A, when the motorcycle 100 leans further on a curve, the projected image projected onto the road surface G will be distorted in accordance with the leaning state of the motorcycle 100. More specifically, the projection range S1 of the projection image on the inside of the leaning motorcycle 100 shrinks, while the projection range S2 of the projection image on the outside expands. As the projection range S2 expands, the content information (projected image) projected onto the projection range S2 becomes stretched out as a whole. Therefore, the content information projected onto the outer projection range S2 becomes difficult to see. Also, as the projection range S1 shrinks, the content information projected onto the projection range S1 becomes compressed as a whole. Therefore, the content information projected onto the inner projection range S1 becomes difficult to see.

[0025] The control unit 10 acquires tilt information using the tilt sensor 30 and, based on the acquired tilt information, determines whether the motorcycle 100 is banked (tilted) to the extent that the projection range S1 is stretched. If it determines that the motorcycle 100 is tilted to the extent that the projection range S1 is stretched, the control unit 10 controls the content information to be displayed on the TFT unit 65 and moves a portion of the content information projected onto the road surface G (the "CAUTION" text information and projected image shown in Figure 4A) from the projection range S1 inside the motorcycle 100 to the projection range S2 outside the motorcycle 100. Figure 4B shows how the "TI" text image has moved from the projection range S1 inside the banking motorcycle 100 to the projection range S2 outside the motorcycle 100. In Figure 4B, the "CAUTI" text is projected onto the projection range S2 outside the banking motorcycle 100, and the "ON" text is projected onto the projection range S1 inside the motorcycle 100.

[0026] Figure 4C shows how, as the motorcycle 100 leans further, the projection range S1 of the inner projection image of the motorcycle 100 shrinks further, and the projection range S2 of the outer projection image expands further. As shown in Figure 4C, the "ON" character image that was projected onto the inner projection range S1 of the leaning motorcycle 100 moves to the outer projection range S2, and all the characters of "CAUTION" are projected onto the outer projection range S2, while no character information is projected onto the inner projection range S1.

[0027] For example, as shown in Figures 4A to 4C, by adjusting (changing) the amount of information (number of characters) of the text information projected onto the projection ranges S1 and S2 in accordance with the tilt state of the motorcycle 100 (according to the bank angle), it is possible to make the text information easily visible to drivers of surrounding vehicles, regardless of the fluctuation state of the projection ranges S1 and S2. Furthermore, because the projection ranges S1 and S2 change significantly depending on the tilt state of the motorcycle 100, it is possible to improve the visibility of the text information by appropriately moving the text information.

[0028] When motorcycle 100 returns to an upright position (from a banked position to an upright position), the "CAUTION" text image, which was projected onto the outer projection range S1 of motorcycle 100 as shown in Figure 4C, gradually moves to the inner projection range S1 as shown in Figures 4B and 4A.

[0029] Figures 4A to 4C illustrate the case where the "CAUTION" text image moves multiple characters at a time between the inner and outer projection ranges in accordance with the tilt state of the motorcycle 100. However, for example, the "CAUTION" text image could also move one character at a time in accordance with the tilt state of the motorcycle 100.

[0030] Furthermore, if the projection range S1 inside the motorcycle 100 narrows due to the tilting state of the motorcycle 100, the control unit 10 may adjust and set the content information to be displayed on the TFT unit 65 to widen the projection range S1 inside, as shown in Figure 4D. Figure 4D shows the state in which the projection range S1 inside the motorcycle 100 shown in Figure 4C has been widened, with the dashed line indicating the projection range S1 before expansion and the solid line indicating the projection range S1A after expansion.

[0031] By widening the inner projection range S1 of the motorcycle 100 in this way, it becomes possible to secure a sufficient inner projection range S1A even when the motorcycle 100 is banked, and it becomes possible to project content information onto the inner projection range S1A as well. Therefore, content information can be projected by effectively utilizing both the inner projection range S1A and the outer projection range S2 of the motorcycle 100, making it possible to effectively warn surrounding vehicles and so on.

[0032] Furthermore, it is possible to adjust and set the content information that the motorcycle 100 displays on the TFT unit 65 so that both the width of the inner projection range S1 and the width of the outer projection range S2 do not change, regardless of the tilt state of the motorcycle 100. In this way, by adjusting and setting the content information displayed on the TFT unit 65, the width of the inner projection range S1 and the width of the outer projection range S2 can be kept constant, regardless of the tilt state of the motorcycle 100. As a result, the content information to be projected can be kept completely still between the inner projection range S1 and the outer projection range S2. In this case, the position of the content information projected onto the road surface G remains the same relative to the motorcycle 100. As a result, it becomes easier for other drivers to see the content information, making it possible to effectively provide warnings and other alerts.

[0033] Furthermore, even when projecting the word "CAUTION" onto a position closer to the front in the direction of travel within the projection range S1 and S2 of the banked motorcycle 100, control by the control unit 10 is possible in the same way as the process described using Figures 4A to 4D.

[0034] Figures 4A to 4D illustrate the motorcycle 100 as seen from the rear. However, as shown in Figure 5, when the motorcycle 100 is viewed from the front, the content information projected at the front of projection ranges S1 and S2 may be moved from the inner (or outer) projection range to the outer (or inner) projection range depending on the tilt of the motorcycle 100.

[0035] Figure 5 is a front view of motorcycle 100 showing how a projection image is projected onto the road surface G by the road surface projection device 1 while motorcycle 100 is in motion. In Figure 5, an arrow image Y indicating the direction of travel of motorcycle 100 is projected at a position slightly forward in the direction of travel within the projection range S1 inside the banked motorcycle 100. Drivers of other vehicles who see this arrow image Y can visually determine the direction of travel of motorcycle 100. Furthermore, by linking the direction of the arrow in arrow image Y to the route guidance of a navigation system, the driver of motorcycle 100 can be visually guided along the route. Note that the arrow image Y is projected similarly in Figures 4A, 4B, and 4D.

[0036] When the motorcycle 100 is banked, as explained in Figures 4A to 4C, the projection range S1 of the inner projection image of the motorcycle 100 shrinks, and the projection range S2 of the outer projection image expands. Therefore, by moving the projection position of the arrow image Y shown in Figure 5 from the reduced projection range S1 to the expanded projection range S2, it is possible to improve the visibility of the arrow image Y.

[0037] Furthermore, as explained with reference to Figure 4D, the projection range S1 inside the motorcycle 100 may be widened when the motorcycle 100 is banked. By widening the projection range S1 inside the motorcycle 100, it becomes possible to secure a sufficient projection range inside the motorcycle even when the motorcycle 100 is banked, and it becomes possible to project content information (for example, an arrow image Y) into the projection range S1. Note that even when projecting the arrow image Y at a position towards the rear in the direction of travel within the projection ranges S1 and S2 of the banked motorcycle 100, the control unit 10 can control it in the same way.

[0038] Furthermore, when the motorcycle 100 is banked, the brightness of the projected image projected onto the road surface G differs between the inner projection range S1 and the outer projection range S2 of the motorcycle 100. Specifically, the brightness of the inner projection range S1 of the motorcycle 100 becomes brighter as the motorcycle 100 is banked (tilted), while the brightness of the outer projection range S2 becomes darker as the motorcycle 100 is banked (tilted). When the brightness of the outer projection range S2 and the inner projection range S1 differ in this way, the content information projected onto projection ranges S1 and S2 becomes difficult to see.

[0039] Therefore, in the road surface projection device 1, the control unit 10 acquires tilt information using the tilt sensor 30, and based on the acquired tilt information, if the control unit 10 determines that the motorcycle 100 has banked so much that the outer projection range S2 can be judged to be darker than the inner projection range S1, the control unit 10 adjusts the brightness of the content information to be displayed on the TFT unit 65 so that the brightness of the outer projection range S2 becomes the same as the brightness of the inner projection range S1.

[0040] By adjusting the brightness of the outer projection area S2 to the same brightness as the inner projection area S1, the brightness of the content information projected onto projection areas S1 and S2 can be kept constant (to prevent differences in overall brightness) regardless of the tilt of the motorcycle 100. This improves the visibility of the content information and makes it possible to effectively alert other drivers.

[0041] Furthermore, the brightness of the inner projection area S1 may be dimmed to be the same brightness as the brightness of the outer projection area S2. In this way, even if the brightness of the inner projection area S1 is dimmed, the brightness of the content information projected onto projection areas S1 and S2 can be kept constant (to prevent differences in overall brightness) regardless of the tilt of the motorcycle 100. This makes it possible to improve the visibility of the content information and to effectively alert other drivers.

[0042] Furthermore, as already explained, when the motorcycle 100 is banked, the projection range S2 on the outside of the motorcycle 100 expands. However, as shown in Figure 6, if the expanded projection range S2A extends into the oncoming lane, there is a risk that the projected light L may enter the field of vision of the driver in the oncoming lane. If the projected light L enters the field of vision of the driver in the oncoming lane in this way, there is a risk that it may interfere with the driver's driving (for example, the projected light L may worsen their forward visibility, or the projected light L may startle the driver).

[0043] In the road surface projection device 1 according to this embodiment, the control unit 10 acquires tilt information using the tilt sensor 30 and controls the projection range of the content information based on the acquired tilt information. Specifically, if the control unit 10 determines that the motorcycle 100 has banked to an angle where the outer projection range S2 may extend into the oncoming lane, it suppresses the display range of the content information to be displayed on the TFT unit 65 so that the outer projection range S2 does not extend into the oncoming lane (see projection range S2B in Figure 6).

[0044] For example, the control unit 10 blacks out (for example, displays a black image) the portion of the content information displayed on the TFT unit 65 that is likely to extend into the oncoming lane, and displays the content information only in the remaining portion. In this way, the control unit 10 controls the content information displayed on the TFT unit 65, thereby preventing the outer projection range S2B from extending into the oncoming lane.

[0045] The road projection device of this disclosure has been described in detail above using the road projection device 1 shown in the embodiment, but the road projection device of this disclosure is not limited to the example shown in the embodiment. For example, although the embodiment described the case in which the road projection device 1 is installed on a motorcycle 100, the vehicle on which the road projection device of this disclosure is installed is not limited to a motorcycle 100. The road projection device of this disclosure is characterized by controlling the projected image according to the tilt state of the vehicle, so any vehicle that can tilt may be a bicycle, a three-wheeled vehicle, etc. Furthermore, any four-wheeled vehicle, etc., may be used as long as the tilt state of the vehicle can be detected by the road projection device of this disclosure. Moreover, it can also be installed on an aerial vehicle such as a drone.

[0046] Furthermore, the road surface projection device 1 shown in the embodiment was described in the case where only one is attached to the bottom surface of the central part of the motorcycle 100. Even if only one road surface projection device 1 is attached to the motorcycle 100, as shown in Figure 1B, the road surface projection device 1 can project an image onto the road surface G around the entire circumference of the motorcycle 100 (excluding the part that is shaded by the tires). In this way, since only one road surface projection device 1 needs to be installed on the motorcycle 100, the burden of installation and the cost burden of the road surface projection device 1 can be reduced.

[0047] However, the installation location of the road surface projection device 1 is not limited to the bottom surface of the central part of the motorcycle 100, and is not particularly restricted as long as it is a location where a projection image can be projected around the vehicle.

[0048] Furthermore, although only one road surface projection device 1 is installed on the motorcycle 100 in the embodiment, the number of road surface projection devices 1 installed is not limited to one. For example, one may be installed at a front position and one at a rear position on the motorcycle 100. Alternatively, one may be installed at a right-hand position and one at a left-hand position on the motorcycle 100.

[0049] Furthermore, in the road surface projection device 1 shown in the embodiment, the case in which the brightness of the outer projection area S2 and the brightness of the inner projection area S1 are adjusted by adjusting the brightness of the content information displayed on the TFT unit 65 has been described. However, the brightness of the projection areas S1 and S2 may be adjusted by other methods, rather than by adjusting the brightness of the content information displayed on the TFT unit 65. For example, the brightness of the projection areas S1 and S2 may be adjusted by controlling the light source unit 61 with the control unit 10 to adjust the brightness of the LED light. [Explanation of symbols]

[0050] 1...Road surface projection device 10 ... Control unit (control means) 20 ... Records Department 30 ... Tilt sensor (tilt detection means) 40 ...Projector unit (projection light output means) 61...Light source section 62...Condenser lens 63... Lenticular lens 64 ... Diffuser 65...TFT section 66 …Optical components 60 ... Image generation unit 70…Projection lens 80...Projection mirror 90 ... cabinet 92...Projection port 100... Motorcycle (vehicle) L…Projection light S1, S1A ... Inner projection range S2, S2A, S2B... Outer projection range Y...Arrow image G...Road surface

Claims

1. A road surface projection device that is installed on a vehicle and projects an image onto the road surface, Projection light output means for outputting projection light for projecting the aforementioned projection image onto the road surface, A control means for controlling the projection light output means to adjust the projection light, The tilt detection means for detecting the tilt of the vehicle and It has, The control means controls the projection light output means to adjust the projection light so that, when the tilt of the vehicle is detected by the tilt detection means, the projection image is projected onto the projection range outside the tilted vehicle. A road surface projection device characterized by the following.

2. The control means controls the projection light output means to adjust the projection light so that the projection position of the projection image projected onto the road surface moves between the projection range inside the tilted vehicle and the projection range outside the tilted vehicle, in accordance with the tilt of the vehicle detected by the tilt detection means. The road surface projection device according to claim 1, characterized by the following:

3. When the tilt detection means detects the tilt of the vehicle, the control means controls the projection light output means to adjust the projection light so that the brightness of the projection range inside the tilted vehicle and the brightness of the projection range outside the tilted vehicle become the same. The road surface projection device according to claim 1, characterized by the following:

4. If, based on the tilt of the vehicle detected by the tilt detection means, it is determined that the projection range of the projected light projected by the projection light output means reaches the oncoming lane of the vehicle, the control means controls the projection light output means to adjust the projected light so that the projection range does not reach the oncoming lane. The road surface projection device according to claim 1, characterized by the following:

5. The aforementioned projection light output means is installed only once on the vehicle, The projection light output from one of the projection light output means projects the projection image onto the road surface surrounding the vehicle. A road surface projection device according to any one of claims 1 to 4, characterized by the above.

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