Lighting system

Abstract

This lighting system includes at least one first lighting device that is installed on the ceiling in a cabin of a moving body and emits awakening light. The at least one first lighting device is a long lighting device that includes at least one light source and is disposed so as to at least partially overlap a movable region of a first seat provided in the cabin when viewed from above.

Description

lighting system

[0001] The present disclosure relates to a lighting system installed in the interior of a vehicle.

[0002] Patent Document 1 discloses a vehicle interior lighting device that includes a light source attached to a recess between a front seat assist grip and a rear seat assist grip, which is located below the side edge of the vehicle roof. The light source is positioned so that illumination light is reflected off the surface of the recess and then illuminates the vehicle interior.

[0003] Patent document 2 discloses a vehicle interior lighting system in which linear light-emitting units having long linear light-emitting elements extending in the longitudinal direction of the vehicle interior ceiling are provided on both the left and right edges of the vehicle interior ceiling, and the light emitted by the linear light-emitting elements directly illuminates the interior of the vehicle.

[0004] However, in the above-mentioned conventional technology, lighting devices are provided on both the left and right edges of the ceiling of the vehicle interior, and the purpose of these lighting devices is to illuminate the interior of the vehicle, so the illuminance is insufficient to wake up the occupants in the seats.

[0005] Patent No. 4419990 Patent No. 4858364

[0006] The present disclosure has been made to solve such problems, and aims to provide a lighting system that wakes up seat occupants.

[0007] In one aspect of the present disclosure, the lighting system includes at least one first lighting device that is installed on the ceiling of the vehicle interior and emits wake-up light, and the at least one first lighting device is a long lighting device that includes at least one light source and is positioned so that it at least partially overlaps with the movable area of ​​a first seat provided in the vehicle interior when viewed from above.

[0008] According to the present disclosure, it is possible to wake up the seat occupant.

[0009] 11 is a diagram showing an electric configuration of a mobile body in which a lighting system according to an embodiment of the present disclosure is arranged; FIG. 12 is a diagram showing the lighting system shown in FIG. 1 as viewed from behind to front of the mobile body; FIG. 13 is a diagram showing the interior of the mobile body as viewed from left to right; FIG. 14 is a diagram showing a detailed configuration of an edge-type lighting device; FIG. 15 is a diagram showing an example of how the lighting device is installed; FIG. 16 is a diagram showing another example of how the lighting device is installed; FIG. 17 is a diagram showing the lighting system as viewed from left to right; FIG. 18 is a diagram showing a detailed configuration of a lens-type lighting device; FIG. 19 is a diagram showing an electric configuration of a lighting system according to an embodiment of the present disclosure;

[0010] (Findings underlying the present disclosure) Research is being conducted into technologies for controlling the in-vehicle environment of a vehicle using multiple devices, such as display devices, audio devices, and lighting devices, to guide the vehicle's occupants into an appropriate state. For example, during the travel period from the departure point to the destination, the occupants can be first guided into a relaxed state, then into a sleeping state, and finally into an awake state, thereby making it possible for the occupants to be refreshed and awake by the time the vehicle arrives at the destination. This allows the occupants to be active after arriving at the destination.

[0011] To wake up the occupants, it is necessary to illuminate them with light of at least 100 lx (lux), but existing lighting devices that illuminate the interior of the vehicle do not provide enough light to wake up the occupants.

[0012] In the vehicle interior lighting device of Patent Document 1, the light source is arranged to illuminate the interior of the vehicle after reflecting the illumination light on the surface of the recess, but does not directly illuminate the occupants, so the illuminance is insufficient to wake the occupants. In the vehicle interior lighting system of Patent Document 2, although the interior of the vehicle is directly illuminated, the linear light-emitting elements are provided on both the left and right edges of the ceiling of the vehicle interior, and the purpose of these elements is also to illuminate the interior of the vehicle, so the illuminance is insufficient to wake the occupants.

[0013] Therefore, the inventor discovered that it is possible to wake up occupants by arranging a long lighting device so that at least a portion of it overlaps the movable area of ​​the seat of a moving body when viewed from above and emitting awakening light from the lighting device, and this led to the present disclosure.

[0014] (1) In one aspect of the present disclosure, a lighting system includes at least one first lighting device that is installed on a ceiling inside a vehicle cabin and emits wake-up light, and the at least one first lighting device is a long lighting device that includes at least one light source and is positioned so that at least a portion of the first lighting device overlaps with a movable area of ​​a first seat provided inside the vehicle cabin when viewed from above.

[0015] According to this configuration, at least one long first lighting device is positioned so that it overlaps at least partially with the movable area of ​​the first seat when viewed from above, so that awakening light can be irradiated onto the occupant from directly above, thereby waking the occupant.

[0016] (2) In the lighting system described in (1) above, the at least one first lighting device may include an elongated light guide, and the at least one light source may be arranged at one end of the light guide in the longitudinal direction so that the light emitting surface faces the longitudinal direction of the light guide.

[0017] With this configuration, the light source is provided at one end of the elongated light guide so that the light-emitting surface faces the longitudinal direction of the light guide, which allows the heat dissipation member of the light source to be positioned facing the front-to-rear direction of the vehicle interior, thereby reducing the height of the lighting device and allowing it to be installed so that it does not protrude from the ceiling surface of the vehicle interior.

[0018] (3) The lighting system according to (1) or (2) above may further include a second lighting device, and the second lighting device may be disposed so as to face the front of the first seat.

[0019] According to this configuration, the occupant is irradiated with the awakening light from the second lighting device from the front, so that the occupant can be more reliably awakened.

[0020] (4) In the lighting system described in any one of (1) to (3) above, the first seat may be a rear seat, and the second lighting device may be installed between the front seat and the rear seat.

[0021] According to this configuration, the awakening light can be projected directly in front of the rear seats, so that rear seat occupants can be more reliably awakened.

[0022] (5) In the lighting system described in any one of (1) to (4) above, the at least one first lighting device may have a variable illuminance, and may further include a control device that changes the illuminance of the at least one first lighting device over time during an awakening phase to awaken an occupant.

[0023] According to this configuration, in the awakening phase, the illuminance of the awakening light output from at least one first lighting device can be changed over time to awaken the occupant in a more comfortable state.

[0024] (6) In the lighting system described in (3) above, the second lighting device may have a variable illuminance, and the lighting system may further include a control device that changes the illuminance of the second lighting device over time.

[0025] According to this configuration, the illuminance of the awakening light output from the second illumination device can be changed over time to awaken the occupant in a more comfortable state.

[0026] (7) In the lighting system described in any one of (1) to (6) above, the ceiling may include a mounting opening for mounting each of the at least one first lighting device and a reinforcing member provided on the underside of the ceiling along the mounting opening, and each of the at least one first lighting device may include a housing embedded in the mounting opening, a first cantilever spring connected to one longitudinal side of the housing, and a second cantilever spring connected to the other longitudinal side of the housing, and the free ends of the first and second cantilever springs may abut against the reinforcing member.

[0027] According to this configuration, when the first lighting device is inserted into the mounting opening, the free ends of the first cantilever spring and the second cantilever spring open away from the longitudinal side of the housing and abut against a reinforcing member provided along the mounting opening on the underside of the ceiling, thereby securing the first lighting device inside the ceiling. This allows the first lighting device to be installed without screws to the ceiling, improving the interior design of the vehicle. Furthermore, it is possible to prevent occupants from colliding with the first lighting device, thereby improving the safety of occupants inside the vehicle. Furthermore, because the free ends abut against the reinforcing member and do not directly abut against the ceiling, the ceiling can be protected.

[0028] (8) In the lighting system described in any one of (1) to (7) above, the brightness of the at least one light source of the at least one first lighting device may be set so that the illuminance on the front of the headrest portion of the first seat is at least 100 lx.

[0029] To wake up a person, it is necessary to irradiate light of at least 100 lx. In this configuration, the first lighting device is configured so that the illuminance on the front of the headrest portion of the first seat is at least 100 lx, so that the occupant can be reliably woken up.

[0030] (9) In the lighting system described in (5) above, the control device may increase the illuminance of the at least one first lighting device over time from an off state to a maximum illuminance during the wake-up phase.

[0031] According to this configuration, the illuminance of the first lighting device increases over time from an off state to maximum illuminance, thereby naturally waking up the occupant.

[0032] (10) The lighting system described in any one of (1) to (9) above may further include at least one third lighting device, and the at least one third lighting device may be an indirect light installed between the front seat and the rear seat.

[0033] According to this configuration, since the third lighting device is provided, the illuminance of the awakening light irradiated on the occupant can be increased, and the occupant can be more reliably awakened. Furthermore, since the third lighting device provides indirect lighting, the design of the vehicle interior can be improved.

[0034] (11) In the lighting system described in any one of (1) to (10) above, the lighting system may further include an acoustic device installed on the ceiling, and the acoustic device may be positioned so that at least a portion of the acoustic device overlaps with the movable area of ​​the first seat when viewed from above.

[0035] This configuration can stimulate the auditory sense of the occupant and wake him up.

[0036] (12) In the lighting system described in any one of (1) to (11) above, a sound collection device may be further provided installed on the ceiling, and the sound collection device may be positioned so that at least a portion of the sound collection device overlaps with the movable area of ​​the first seat when viewed from above.

[0037] According to this configuration, the sounds of the occupants can be picked up and the state of the occupants can be confirmed.

[0038] (13) In another aspect of the present disclosure, the environment forming system includes an acoustic device installed on a ceiling inside the vehicle cabin, and the acoustic device is positioned so that it at least partially overlaps with the movable area of ​​a first seat provided inside the vehicle cabin when viewed from above.

[0039] (14) In yet another aspect of the present disclosure, the environment forming system includes a sound collection device installed on a ceiling inside the vehicle cabin, and the sound collection device is positioned so that it at least partially overlaps with the movable area of ​​a first seat provided inside the vehicle cabin when viewed from above.

[0040] Note that each of the embodiments described below represents a specific example of the present disclosure. The numerical values, shapes, components, steps, and step orders shown in the following embodiments are merely examples and are not intended to limit the present disclosure. Furthermore, among the components in the following embodiments, components that are not described in the independent claims that represent the highest concept are described as optional components. Furthermore, in all of the embodiments, the respective contents can be combined.

[0041] 1 is a top view of a mobile body 500 in which a lighting system 1 according to an embodiment of the present disclosure is arranged. The lighting system 1 is arranged in the cabin of the mobile body 500. The lighting system 1 includes a lighting device 10 (an example of a first lighting device) and a display device 40. The lighting device 10 is provided on a ceiling 510 in the cabin. The lighting device 10 includes a pair of lighting devices 11 and 12. The lighting devices 11 and 12 each include at least one light source and are elongated in the traveling direction D1 of the mobile body 500. The lighting devices 11 and 12 are arranged on the ceiling 510 in the cabin of the mobile body 500.

[0042] The vehicle 500 includes a front seat located at the front side of the vehicle interior in the traveling direction D1 and a rear seat (an example of a first seat) located at the rear side. The lighting devices 11 and 12 are arranged so that they at least partially overlap with the range of motion of the rear seat when viewed from above the vehicle. The lighting devices 11 and 12 are parallel to each other and have the same length. The tips of the lighting devices 11 and 12 are curved toward the center of the vehicle 500. The display device 40 is provided between the front seat and the rear seat. The display device 40 presents video content to passengers in the rear seat.

[0043] FIG. 2 is a view of the lighting system 1 shown in FIG. 1 as viewed from the rear to the front of the vehicle 500. The lighting system 1 further includes a lighting device 20 (an example of a second lighting device). The lighting device 20 and the display device 40 are installed on a wall surface 530 provided between the front seat and the rear seat 520. The rear seat 520 is a seat that can accommodate three people lined up in the left-right direction of the vehicle 500. The left-right direction is a direction parallel to the floor of the vehicle 500 and perpendicular to the front-to-rear direction. The left direction refers to the left side when the vehicle 500 is viewed from the rear to the front, and the right direction refers to the right side when the vehicle 500 is viewed from the rear to the front. The lighting device 20 is installed above the display device 40. The lighting device 20 is elongated in the left-to-right direction. The display device 40 is a large-screen display device that occupies most of the area of ​​the wall surface 530. The display surface of the display device 40 faces the rear seat 520.

[0044] The lighting device 11 has a curved tip T11 toward the center of the moving body 500. The lighting device 12 has a curved tip T12 toward the center of the moving body 500. When viewed from above, the tip T11 and the tip T21 of the lighting device 20 are almost continuous. When viewed from above, the tip T12 and the tip T22 of the lighting device 20 are almost continuous. In this example, the tips T11 and T21 are curved toward the center, but they do not have to be curved. In this case, the lighting devices 11 and 12 are linear.

[0045] 3 is a view of the interior of the vehicle 500 viewed from left to right. The vehicle 500 includes a ceiling 510, a rear seat 520, a wall 530, a front seat 540, and a floor 550. A driver 601 is seated in the front seat 540. The driver 601 is a passenger who operates the vehicle 500. A passenger 600 is seated in the rear seat 520. The passenger 600 is a passenger seated in the rear seat 520. The wall 530 is erected in the vertical direction relative to the floor 550. The lighting device 20 is provided between the ceiling 510 and the display device 40.

[0046] Illumination device 20 (an example of a second illumination device) is disposed so that its light-emitting surface faces the front of rear seat 520. This allows illumination device 20 to illuminate occupant 600 from the front. Furthermore, because the light-emitting surface of illumination device 20 faces rearward, not forward, it is possible to prevent wake-up light from illumination device 20 from being reflected on the windshield and interfering with the driver's driving.

[0047] The display device 40 is configured as a transparent display. The wall surface 530 has an opening in the area where the display device 40 is located. Therefore, the scenery ahead of the vehicle 500 passes through the wall surface 530 and the display device 40. This allows the occupant 600 to see both the scenery ahead and the image displayed on the display device 40. The display device 40 is not limited to a transparent display, and may be a normal display, a smartphone display, or a tablet computer display. The display device 40 may also be a screen for projecting video content.

[0048] In the example of Fig. 3, three lighting devices 10 are arranged in a row in the traveling direction D1. The number of lighting devices 10 arranged in a row is not limited to three, and may be one, two, four or more. The traveling direction D1 is the same as the front-to-rear direction. Of the three lighting devices 10, only the lighting device 10 directly above the seating position of the occupant 600 may be turned on, and the remaining lighting devices may be turned off. This can save power consumption.

[0049] The rear seat 520 includes a reclining back portion 520a, a seat portion 520b on which the buttocks of the occupant 600 rest, and a headrest 520c provided on the upper side of the back portion 520a. The rear seat 520 is configured to be slidable in the front-to-rear direction. The range of motion of the rear seat 520 refers to the section in the front-to-rear direction from the position of the tip 520d of the seat portion 520b when the rear seat 520 is slid all the way forward and the back portion 520a is fully upright to the position of the tip 520e of the headrest 520c when the rear seat 520 is slid all the way rearward and the back portion 520a is fully tilted backward.

[0050] 3, the lighting device 10 is arranged so as to overlap almost the entire movable range of the rear seat 520 when viewed from above. However, this is just one example, and it is sufficient that the lighting device 10 is arranged so as to overlap at least the rear seat 520 when viewed from above when the sliding position of the rear seat 520 is in the normal position and the degree of inclination of the back surface 520a is normal.

[0051] By providing the lighting device 10 on the ceiling 510, it becomes easy to irradiate the face of the occupant 60 with wake-up light of at least 100 lx illuminance, regardless of the degree to which the rear seat 520 is reclined.

[0052] The lighting device 10 is configured so that the direction of light distribution varies depending on the position in the fore-and-aft direction. In this example, the lighting device 10 is configured so that the light distribution is directed directly downward at the front side and the degree of rearward inclination of the light distribution increases toward the rear. Furthermore, the brightness and light distribution of the lighting device 10 are set so that the illuminance of the wake-up light at the headrest 520c is at least 100 lx. This allows the wake-up light of at least 100 lx to be irradiated onto the face of the occupant 600, thereby reliably waking the occupant 600. The brightness of the lighting device 10 may also be set so that the illuminance on the face of the occupant 600 is at least 100 lx, even for an occupant 600 wearing AR glasses.

[0053] The lighting device 20 is configured so that the direction of light distribution varies depending on the vertical position. In this example, the lighting device 20 is configured so that the light distribution faces directly rearward at the upper side and the degree of downward inclination of the light distribution increases toward the lower side. This allows the lighting device 10 and the lighting device 20 to irradiate the wake-up light onto the face of the occupant 600 regardless of the sliding position and reclining state of the rear seat 520 and the body shape of the occupant 600. As a result, the occupant 600 can be reliably awakened. Furthermore, the brightness and light distribution of the lighting device 20 are set so that the illuminance of the wake-up light at the headrest 520c is at least 100 lx. This allows the wake-up light of at least 100 lx to be irradiated onto the face of the occupant 600, reliably waking the occupant 600. The brightness of the lighting device 20 is also set so that the illuminance on the face of the occupant 600 is at least 100 lx, even for an occupant 600 wearing AR glasses.

[0054] FIG. 4 is a diagram showing a detailed configuration of the lighting device 10. The upper figure is a cross-sectional view of the lighting device 10 taken along the line 4-4 in the lower figure, and the lower figure is a view of the lighting device 10 viewed from left to right. FIG. 4 shows a board-mounted lighting device 10. The lighting device 10 includes a light source 111, a light guide 112, a housing 113, a substrate 114, and a heat dissipation member 115. The housing 113 has a rectangular column shape and is open at the bottom. The substrate 114 is installed on the upper wall inside the housing 113. A plurality of light sources 111 are arranged in a row in the front-to-rear direction on the underside of the substrate 114. The light source 111 is, for example, composed of light-emitting diodes. The light-emitting surface of the light source 111 faces downward. The light guide 112 is provided below the light source 111 inside the housing 113. The light guide 112 has a rectangular column shape that is elongated in the front-to-rear direction. The light guide 112 is made of polycarbonate or acrylic resin.

[0055] The heat dissipation member 115 is provided between the outer upper surface of the housing 113 and the outer wall 511 of the moving body 500. The heat dissipation member 115 cools the light source 111. The light distribution of the lighting device 10 can be adjusted by processing the light guide 112 into a prism.

[0056] In the board-mounted lighting device 10, the back surface of the light source 111 faces upward, so the heat dissipation member 115 needs to be disposed on the outer upper surface of the housing 113. As a result, the height of the lighting device 10 becomes longer than the height from the outer wall 511 of the vehicle 500 to the ceiling 510, and the lighting device 10 protrudes downward from the ceiling 510. This impairs the interior design of the vehicle and may cause the body of the occupant 600 to collide with the lighting device 10.

[0057] Therefore, in this embodiment, it is also possible to adopt an edge-type lighting device 10 shown below instead of the board-mounted lighting device 10. Fig. 5 is a diagram showing the detailed configuration of an edge-type lighting device 10a. In Fig. 5, the upper diagram is a cross-sectional view of the lighting device 10a taken from the direction 5-5 shown in the lower diagram, and the lower diagram is a view of the lighting device 10a viewed from left to right.

[0058] The lighting device 10a includes a light source 211, a light guide 212, and a housing 213. The housing 213 has a prismatic shape and is open at the bottom. The light guide 212 is disposed inside the housing 213. The light guide 212 is made of polycarbonate or acrylic resin. The light guide 212 is long in the front-to-rear direction. The light guide 212 has a tapered portion 212a that reduces its width in the up-down direction toward the rear. The bottom surface of the light guide 212 is parallel to the floor 550. This allows the light guide 212 to direct light emitted rearward from the light source 211 downward.

[0059] The light source 211 is provided at the front end 212b of the light guide 212. The light source 211 is, for example, a light-emitting diode. The light-emitting surface of the light source 211 faces rearward. Since the light source 211 is provided at the end 212b of the lighting device 10a, a heat dissipation member (not shown) can be disposed on the front side of the housing 213. This allows the height of the lighting device 10a to be equal to or less than the height of the exterior wall 511 and the ceiling 510, preventing the lighting device 10a from protruding downward from the ceiling 510. As a result, the interior design of the vehicle is maintained and the body of the occupant 600 is prevented from colliding with the lighting device 10a. The light distribution of the lighting device 10a can be adjusted by prism-processing the light guide 212.

[0060] Consider an example in which the light source 211 is disposed on the rear side of the lighting device 10a and the light source 211 is disposed so that its light-emitting surface faces forward. In this example, the wake-up light from the light source 211 is directed forward, and this wake-up light may leak from the display device 40 and the wall surface 530 toward the front seat 540 and be reflected on the windshield, potentially interfering with the driver's driving. In the example of Fig. 5, the light source 211 is disposed on the front side so that its light-emitting surface faces rearward, thereby preventing the wake-up light from leaking toward the front seat 540 and being reflected on the windshield.

[0061] In the example of Fig. 3, the lighting device 20 may be configured as an edge-type lighting device 10a. When the lighting device 10 is configured as an edge-type lighting device 10a, the housing 213 is arranged so that its longitudinal direction faces the left-right direction. The end 212b of the light guide 212 may be arranged on the left side or the right side. When the end 212b is arranged on the left side, the light source 211 is arranged on the left side so that its light-emitting surface faces the center, and when the end 212b is arranged on the end 212b, the light source 211 is arranged on the right side so that its light-emitting surface faces the center.

[0062] FIG. 6 is a diagram showing an example of how the lighting device 10a is attached. The example in FIG. 6 shows the lighting device 10a as seen from the front. The ceiling 510 has a mounting opening 510a for mounting the lighting device 10a. A pair of reinforcing members 710, 720 are provided on the back surface of the ceiling 510, along the mounting opening 510a. The mounting opening 510a has a rectangular shape that is elongated in the front-to-rear direction and has approximately the same shape as the underside of the lighting device 10a. The reinforcing member 710 is provided on the back side of the ceiling 510, along one side in the longitudinal direction of the mounting opening 510a. The reinforcing member 720 is provided on the back side of the ceiling 510, along the other side in the longitudinal direction of the mounting opening 510a. The reinforcing members 710, 720 are made of resin. The reinforcing members 710, 720 have a rectangular column shape that is elongated in the front-to-rear direction.

[0063] The lighting device 10a further includes a pair of cantilever springs 730, 740 (examples of first and second cantilever springs). The housing 213 is embedded in the mounting opening 510a. The cantilever springs 730, 740 are plate-shaped elastic bodies. The cantilever spring 730 is connected to one side surface 213a in the longitudinal direction of the housing 213. The cantilever spring 740 is connected to the other side surface 213b in the longitudinal direction of the housing 213. The cantilever spring 730 includes a fixed end 730b connected to the side surface 213a and a free end 730a. The cantilever spring 740 includes a fixed end 740b connected to the side surface 213b and a free end 740a. The free end 730a abuts against the upper surface of the reinforcing member 710. The free end 740a abuts against the upper surface of the reinforcing member 720. The cantilever spring 730 applies tension to the side surface 213a and the reinforcing member 710. The cantilever spring 740 applies tension to the side surface 213b and the reinforcing member 720. In this way, the lighting device 10a is held within the ceiling 510 by the cantilever springs 730 and 740.

[0064] During installation, the lighting device 10a is inserted upward from the bottom of the mounting opening 510a. When the lighting device 10a is fully inserted into the mounting opening 510a, the free end 730a of the cantilever spring 730 and the free end 740a of the cantilever spring 740 open so as to move away from the side surfaces 213a and 213b of the housing 213. This causes the free end 730a to abut against the upper surface of the reinforcing member 710, and the free end 740a to abut against the upper surface of the reinforcing member 720. As a result, the lighting device 10a is fixed inside the ceiling 510. This allows the lighting device 10 to be installed without screws to the ceiling 510, thereby improving the interior design of the vehicle. Furthermore, because the free ends 730a and 740a abut against the reinforcing members 710 and 720, and do not directly abut against the ceiling 510, deformation of the ceiling 510 is prevented, thereby protecting the ceiling 510. Furthermore, since the ceiling 510 is prevented from being changed, it is possible to prevent the lighting device 10 from falling from the ceiling 510. The cantilever springs 730 and 740 in Fig. 6 may be applied to a board-mounted lighting device 10.

[0065] FIG. 7 is a diagram showing another example of how the lighting device 10 is mounted. The vehicle 500 includes a scroll mounting plate 801. The scroll mounting plate 801 is a plate provided inside the ceiling 510 and parallel to the ceiling 510. The lighting device 10 is fastened to the scroll mounting plate 801 with a plurality of screws 802. The screws 802 are fastened to the scroll mounting plate 801 via the upper surface of the housing 113. In this example, a diffusing material 803 is attached to the mounting opening 510a. The diffusing material 803 is made of milky white polycarbonate. The diffusing material 803 is arranged so as to be continuous with the ceiling 510. The wake-up light emitted from the lighting device 10 is guided into the vehicle cabin via the diffusing material 803.

[0066] 8 is a view of the lighting system 1 viewed from left to right, with the left view showing the rear seat 520 in the normal sliding position and the right view showing the rear seat 520 in the rearmost sliding position. In the left view, the rear seat 520a is reclined to the normal position. In the right view, the rear seat 520a is reclined to the maximum position.

[0067] In the example of Fig. 8, three edge-type lighting devices 10a are arranged in a row in the front-to-rear direction. Like the lighting device 10, the lighting device 10a is configured so that the light distribution is directed directly downward at the front side and the degree of the light distribution slope toward the rear increases toward the rear side. This allows the lighting device 10a to prevent the wake-up light from being reflected on the windshield and to irradiate the wake-up light onto the face of the occupant 600.

[0068] The light distribution of the lighting devices 10a and 20 is set so that the wake-up light is irradiated onto the faces of the occupants when the rear seat 520 is in the normal state shown in the left diagram of Fig. 8. Also, the light distribution of the lighting devices 10a and 20 is set so that the wake-up light is irradiated onto the faces of the occupants when the rear seat 520 is in the maximum reclining state shown in the right diagram of Fig. 9. This allows the lighting devices 10a and 20 to reliably irradiate the wake-up light onto the faces of the occupants when the rear seat 520 is in at least a range from the normal state to the maximum reclining state.

[0069] The combined illuminance of the wake-up light from lighting devices 10a and 20 on the face may be 100 lx. Furthermore, even if the wake-up light from lighting device 20 does not hit the face of the occupant when the seat is reclined, the wake-up light with a illuminance of 100 lx on the face may still be emitted from lighting device 10a alone.

[0070] In this embodiment, a lens-type lighting device 10c shown in FIG. 9 may be employed in place of the board-mounted lighting device 10 and the edge-type lighting device 10a.

[0071] FIG. 9 illustrates a detailed configuration of the lens-type lighting device 10c. In FIG. 9, the left side shows the lighting device 10c viewed from the front, and the right side shows the lighting device 10c viewed from below. The lighting device 10c includes a light source 911, a light guide 912, and a housing 913. A plurality of light sources 911 are arranged in a line along the front-to-rear direction. The light source 911 is, for example, a light-emitting diode. A plurality of light guides 912 are arranged corresponding to the plurality of light sources 911. The light guide 912 is made of, for example, polycarbonate or acrylic resin. The upper surface of the light guide 912 is connected to the light-emitting surface of the light source 911. The light guide 912 has a dome-like shape in which the area of ​​its circular cross section increases downward, and functions as a lens. The lower surface of the light guide 912 is connected to the mounting opening 510a. The housing 913 has an open bottom and an elongated prismatic shape along the traveling direction D1. A frame 914 is provided at the bottom of the housing 913 so as to be exposed from the ceiling 510. The wake-up light from the light source 911 is guided into the vehicle interior through the light guide 912 and the opening of the frame 914.

[0072] 6 are attached to side surfaces 913a and 913b of the housing 913. As a result, the lighting device 10c is inserted into the ceiling 510 through the mounting opening 510a and is held in place within the ceiling 510 by the tension of the cantilever springs 730 and 740. The lighting device 20 may be configured as a lens-type lighting device 10c. In this case, the housing 913 is positioned so that its longitudinal direction faces the left-right direction.

[0073] The lighting system 1 may include one or more lighting devices at a position facing the occupant 600. Fig. 10 is a view of the lighting system 1 including one or more lighting devices provided at a position facing the occupant 600, viewed from the rear to the front of the vehicle 500.

[0074] The lighting system 1 further includes a lighting device 31 provided above the display device 40 and a lighting device 32 provided below the display device 40. The lighting devices 31 and 32 are collectively referred to as lighting devices 30. The lighting device 30 is an example of a third lighting device.

[0075] Fig. 11 is a view from left to right of the lighting system 1 shown in Fig. 10. Fig. 12 is a view showing in detail the lighting devices 31 and 32 shown in Fig. 11. The lighting device 31 is attached to a wall surface 1301 extending downward from the ceiling 510.

[0076] The lighting device 32 is attached to a wall surface 1302 extending upward from the floor 550. Like the lighting device 10, the lighting devices 31 and 32 are configured as board-mounted lighting devices. However, this is merely an example, and the lighting devices 31 and 32 may be configured as edge-type lighting devices 10b or lens-type lighting devices 10c. The lighting devices 31 and 20 are attached to the wall surface 1301 so that the light-emitting surfaces of the lighting devices 31 and 20 are contiguous with the display surface of the display device 40. The lighting device 32 is attached to the wall surface 1302 so that the light-emitting surface of the lighting device 32 is contiguous with the display surface of the display device 40. This prevents the wake-up light from being reflected on the display device 40. In the example of FIG. 11 , an edge-type lighting device 10a is attached to the ceiling 510. However, this is merely an example, and the board-mounted lighting device 10 or lens-type lighting device 10c may be attached to the ceiling 510.

[0077] Referring to Figure 12, a fixture 1311 is provided below the lighting device 31 to convert the wake-up light from the lighting device 31 into indirect illumination. The fixture 1311 is slanted so that the distance from the light-emitting surface of the lighting device 31 gradually increases toward the top, and the fixture 1311 is attached to the bottom of the lighting device 31. The fixture 1311 is configured so that a gap 1311a is formed between the top end of the fixture 1311 and the ceiling 510. As a result, the wake-up light from the lighting device 31 is reflected by the fixture 1311 and then guided into the vehicle cabin through the gap 1311a.

[0078] A fixture 1312 that converts the wake-up light from the lighting device 32 into indirect illumination light is provided above the lighting device 32. The fixture 1312 has a sloping shape such that the distance from the light-emitting surface of the lighting device 32 gradually increases as it approaches the lower end, and is attached to the upper part of the lighting device 32. The fixture 1312 is configured to create a gap 1312a between the lower end of the fixture 1312 and the floor 550. As a result, the wake-up light from the lighting device 32 is reflected by the fixture 1312 and then guided into the vehicle cabin through the gap 1312a. As a result, the wake-up light from the lighting device 32 is guided into the vehicle cabin as indirect illumination light, preventing the wake-up light from the lighting devices 31, 32 from directly entering the eyes of the occupant 600.

[0079] Illumination devices 31 and 32 include light sources of four colors, R (red), G (green), B (blue), and W (white), arranged in a matrix. This allows the four colors of light to mix in the space between fixture 1311 and illumination device 31 and the space between fixture 1312 and illumination device 32, preventing color unevenness in the wake-up light. In addition, the light-emitting surfaces of illumination devices 31 and 32 and illumination device 20 face toward occupant 600, making installation of illumination devices 31, 32, and 20 easy.

[0080] 13 is a block diagram showing the electrical configuration of a lighting system 1 according to an embodiment of the present disclosure. The lighting system 1 includes a control device 400, lighting control units 411, 412, and 413, and lighting devices 10, 20, and 30.

[0081] The control device 400 is configured by, for example, a computer including a central processing unit (CPU) and a memory. The control device 400 outputs control signals to the lighting control units 411 to 413 to control the illuminance of the lighting devices 10, 20, and 30.

[0082] The lighting control unit 411 is composed of a drive circuit that controls the lighting device 10, and adjusts the illuminance of the lighting device 10 in accordance with a control signal output from the control device 400. The lighting control unit 412 is composed of a drive circuit that controls the lighting device 20, and adjusts the illuminance of the lighting device 20 in accordance with a control signal output from the control device 400. The lighting control unit 411 is composed of a drive circuit that controls the lighting device 30, and adjusts the illuminance of the lighting device 30 in accordance with a control signal output from the control device 400.

[0083] The control device 400 may display video content on the display device 40 to guide the occupant 600 into a state corresponding to multiple phases, may cause an audio device (not shown) to output audio content, may dim the lighting devices 10 to 30, or may cause a diffuser (not shown) to output a fragrance.

[0084] The multiple phases that can be adopted include a relax phase, a sleep phase following the relax phase, and a wakefulness phase following the sleep phase. The relax phase is a phase that guides the occupant 600 into a relaxed state. The sleep phase is a phase that guides the occupant 600 into a sleep state. The wakefulness phase is a phase that guides the occupant 600 into a wakefulness state. By performing the relax phase and the sleep phase in this order, the occupant 600 can sleep soundly. Furthermore, by performing the sleep phase and the wakefulness phase in this order, the occupant 600 can be woken up in a refreshed state. This allows the occupant 600 to be active after arriving at the destination.

[0085] The control device 400 controls the operations of the lighting devices 10 to 30, the display device 40, the audio device, and the diffuser according to the multiple phases. For example, the control device 400 may determine content for the relax phase, content for the sleep phase, and content for the wake phase from the departure point to the destination, and output control signals to the display device 40 and the audio device to play the determined content.

[0086] FIG. 14 is a graph showing changes in the illuminance of the lighting devices 10 to 30 during the wake-up phase. In FIG. 14, the vertical axis represents illuminance, and the horizontal axis represents time. Time t0 is the start time of the wake-up phase. Time t2 is the end time of the wake-up phase. When the wake-up phase starts, the control device 400 outputs a control signal to the lighting control units 411 to 413 to increase the illuminance of the lighting devices 10 to 30 over time from 0 (off state) to maximum illuminance. As a result, the illuminance of the wake-up light output by the lighting devices 10 to 30 increases over time from 0 to maximum illuminance. Here, the control device 400 may increase the illuminance of the wake-up light quadratically or linearly. In the example of FIG. 14, the illuminance is increased quadratically. Increasing the illuminance over time can prevent the occupant 600 from suddenly waking up and not feeling refreshed.

[0087] At time t1, the illuminance reaches the maximum illuminance. Once the maximum illuminance is reached, the control device 400 controls the lighting devices 10 to 30 so that the maximum illuminance is maintained until time t2. The maximum illuminance can be at least 100 lx.

[0088] Thus, according to this embodiment, the long lighting device 20 is positioned so that at least a portion of it overlaps the movable area of ​​the rear seat 520 when viewed from above, so that awakening light can be irradiated onto the occupant 600 from directly above, thereby waking up the occupant 600.

[0089] Furthermore, in this embodiment, the occupant 600 is irradiated with the awakening light from the lighting device 20, which can more reliably awaken the occupant 600. Furthermore, in this embodiment, the occupant 600 is irradiated with indirect illumination light from the lighting device 30 as the awakening light, which can more naturally awaken the occupant 600.

[0090] The present disclosure can employ the following modifications.

[0091] (First Modification) In the present disclosure, an acoustic device 700 may be provided in the moving body 500 instead of or in addition to the lighting device 10 .

[0092] 15 is a view of the interior of the vehicle cabin 500 as viewed from left to right in the first modified example. As shown in FIG. 15, the acoustic device 700 is disposed on the ceiling 510 of the vehicle 500, similar to the lighting device 10.

[0093] The acoustic device 700 may be disposed at any position on the ceiling 510. For example, the acoustic device 700 is disposed on one of the longitudinal extensions of the elongated lighting device 10 (first lighting device). The acoustic device 700 is disposed so that it at least partially overlaps with the seating position of the occupant (movable area of ​​the first seat) when viewed from above. The seating position of the occupant 600 is within the movable area of ​​the rear seat 520 (first seat). In the example of FIG. 15 , the acoustic device 700 is disposed in front of the lighting device 10.

[0094] 3 , when a plurality of lighting devices 10 are provided on ceiling 510, as long as the illuminance in front of the headrest of rear seat 520 is at least 100 lx, at least one of the lighting devices 10 may be replaced with acoustic device 700. In this case, acoustic device 700 and lighting device 10 may be arranged in the following order from the front: acoustic device 700, lighting device 10, and lighting device 10.

[0095] Fig. 16 is a diagram showing an example of how an acoustic device 700 is worn. In the example of how an acoustic device 700 is worn, the light source 211 and the light guide 212 of the lighting device 10a shown in Fig. 6 are replaced with the acoustic device 700. In detail, the speaker 701 of the acoustic device 700 is disposed in the housing 213. The speaker 701 is disposed in the housing 213 so that the sound output direction faces downward. The example of how an acoustic device 700 is worn in Fig. 16 is the same as the example of how an acoustic device 700 is worn in Fig. 6, except that the light source 211 and the light guide 212 are replaced with the speaker 701.

[0096] The acoustic device 700 needs to reduce the influence of heat from outside the vehicle (ceiling), so the acoustic device 700 has a speaker 701 housed in the housing 213.

[0097] An acoustic cover 750 is attached to the mounting opening 510a of the housing 213. The acoustic cover 750 protrudes downward from the ceiling 510. Since the acoustic cover 750 is thin, this protrusion does not pose a problem.

[0098] 16, similar to the installation example in Fig. 6, acoustic device 700 can be attached to ceiling 510 without screws, thereby improving the interior design of the vehicle. Furthermore, the installation example shown in Fig. 16 can prevent the body of occupant 600 from colliding with acoustic device 700, thereby improving the safety of occupant 600 inside the vehicle. Furthermore, in the installation example shown in Fig. 16, free ends 730a, 740a abut against reinforcing members 710, 720, and do not directly abut against ceiling 510, thereby protecting ceiling 510.

[0099] Note that acoustic cover 750 may be provided so as not to protrude below ceiling 510. For example, a net may be attached directly to mounting opening 510a.

[0100] (Second Modification) In the present disclosure, a sound collection device 800 may be provided in the moving body 500 instead of or in addition to the lighting device 10. Note that the sound collection device 800 may be provided in the moving body 500 in addition to the lighting device 10 and the acoustic device 700.

[0101] Fig. 17 is a view of the interior of the vehicle cabin of the vehicle 500 in the second modified example, viewed from the left to the right. As shown in Fig. 17, the sound collection device 800 is arranged on the ceiling 510 of the vehicle 500, similar to the lighting device 10. The sound collection device 800 is arranged so that it at least partially overlaps with the seating position of the occupant (movable area of ​​the first seat) when viewed from above. The seating position of the occupant 600 is the movable area of ​​the rear seat 520 (first seat). In the example of Fig. 17, the sound collection device 800 is arranged in front of the lighting device 10.

[0102] The sound collection device 800 is provided for the purpose of collecting the speech of the occupant 600 for voice calls or application control, for example. Alternatively, the sound collection device 800 is provided for the purpose of collecting the sound emitted by the occupant 600 for user state estimation. The sound collection device 800 includes a sound collection microphone. The sound collection microphone may have, for example, a beamforming function and an AI sound collection function. The AI ​​sound collection function is a function for collecting only the sound that is to be collected, without collecting the sound output from the acoustic device 700.

[0103] Like the acoustic device 700, the sound collection device 800 may be placed anywhere on the ceiling 510. The sound collection device 800 may be placed integrally with the acoustic device 700. That is, both the acoustic device 700 and the sound collection device 800 may be stored in the same housing 213. The acoustic device 700, the sound collection device 800, and the lighting device 10 may each be placed in a different location on the ceiling 510.

[0104] Fig. 18 is a diagram showing an example of how the sound collection device 800 is worn. In the example of how the sound collection device 800 is worn, the light source 211 and the light guide 212 of the lighting device 10a shown in Fig. 6 are replaced with the sound collection device 800. In detail, the sound collection microphone 810 of the sound collection device 800 is disposed in the housing 213. The example of how the sound collection device 800 is worn in Fig. 18 is the same as the example of how the sound collection device 800 is worn in Fig. 6, except that the light source 211 and the light guide 212 are replaced with the sound collection microphone 810.

[0105] The sound collection device 800 needs to reduce the influence of heat from outside the vehicle, so the sound collection device 800 is housed in the housing 213.

[0106] A sound collection cover 850 is attached to the mounting opening 510a of the housing 213. The sound collection cover 850 protrudes downward from the ceiling 510. Since the sound collection cover 850 is thin, this protrusion does not pose a problem.

[0107] 18, similar to the installation example of Fig. 6, sound collection device 800 can be attached to ceiling 510 without screws, thereby improving the interior design of the vehicle. Furthermore, the installation example of Fig. 18 can prevent the body of occupant 600 from colliding with sound collection device 800, thereby improving the safety of occupant 600 inside the vehicle. Furthermore, in the installation example of Fig. 18, free ends 730a, 740a abut against reinforcing members 710, 720, and do not abut directly against ceiling 510, thereby protecting ceiling 510.

[0108] (Third Modification) FIG. 19 is a top view of a moving body 500 in which an environment creating system according to a third modification is installed.

[0109] As shown in Fig. 19, a pair of sound collection devices 800 are arranged on the front seat side of the ceiling 510. A lighting device 10, an acoustic device 700, and a sound collection device 800 are arranged on the rear seat side of the ceiling 510. In detail, four sound collection devices 800 are provided above the left front seat, the right front seat, the left rear seat, and the right rear seat. Two acoustic devices 700 are arranged above the left rear seat and the right rear seat. A lighting device 11 is arranged on the left end side of the ceiling 510 parallel to the traveling direction D1, and a lighting device 12 is arranged on the right end side of the ceiling 510 parallel to the traveling direction D1.

[0110] For example, the sound collection device 800 in the front seat may use the AI ​​sound collection function to collect only the sounds of the occupant 600 sitting in the front seat, without collecting the sounds of the acoustic device 700. Similarly, the sound collection device 800 in the rear seat may use the AI ​​sound collection function to collect only the sounds of the occupant 600 sitting in the rear seat, without collecting the sounds of the acoustic device 700.

[0111] The speaker 701 of the acoustic device 700 is provided in the housing 213, the sound collection microphone 810 of the sound collection device 800 is provided in the housing 213, and the light source 211 and light guide 212 of the lighting device 10 are provided in the housing 213. The speaker 701, sound collection microphone 810, light source 211, and light guide 212 provided in the housing 213 in this manner may be configured to be replaceable.

[0112] In this case, the housing 213 functions as a socket. By configuring it to be replaceable, it is possible to newly install the acoustic device 700, the sound collection device 800, and the lighting device 10 without providing an additional mounting port 510a, and to easily change the type of device depending on the situation.

[0113] In the first to third modified examples, instead of or in addition to the acoustic device 700 and the sound collection device 800, an environment creating device such as a fragrance emitting device or an air purifying device may be provided.

[0114] (Fourth Modification) The lighting device 10 may be arranged in a direction perpendicular to the traveling direction D1 of the vehicle 500 (left-right direction) as long as the lighting device 10 is arranged so as to overlap at least a portion of the range of motion of the rear seat 520 when viewed from above the vehicle 500. In this case, it is more preferable that the lighting device 10 is arranged forward of the headrest 520c when the rear seat 520 is slid all the way forward and the back surface 520a is raised all the way. This allows at least one lighting device 10 to irradiate all of the occupants with wake-up light even when multiple occupants are seated in the rear seat 520 at the same time.

[0115] (Fifth Modification) The lighting device 10 may include lighting devices 11 and 12 arranged in parallel and lighting devices arranged perpendicular to the lighting devices 11 and 12 (in the left-right direction). Furthermore, the lighting devices 11 and 12 and the lighting devices arranged in the left-right direction may be configured to be continuous, forming a "C" shape. Here, the light distribution direction of the lighting devices installed in the left-right direction may be set to be in the longitudinal direction, i.e., toward the right (or left, or both), as in the embodiment, as long as the facial illuminance is 100 lx or more. By arranging the lighting devices 10 and setting the light distribution in this manner, it is possible to reliably provide wake-up light to the occupant even when, for example, the occupant is sleeping facing sideways. Alternatively, multiple lighting devices with a light distribution directed from the front to the rear of the vehicle 500 may be arranged in a horizontal row.

[0116] (Sixth Modification) Illumination device 20 does not have to be installed on wall surface 530 as long as it is disposed so as to face the front of rear seat 520. For example, illumination device 20 may be installed so as to be suspended from ceiling 510. Furthermore, illumination device 20 may have a support or leg and be installed so as to extend from the side surface of the interior of the vehicle or the floor surface of the interior of the vehicle. Alternatively, illumination device 20 may be attached to display device 40. In these cases, illumination device 20 is preferably installed at a height and position that does not get in the way of occupants getting in and out of the vehicle.

[0117] (Seventh Modification) The number of lighting devices 20 is not limited to one, and may be multiple. For example, multiple lighting devices 20 may be installed on the backs of the headrests of one or more front seats 540, respectively. Alternatively, multiple lighting devices 20 may be installed on the backs of one or more front seats 540, respectively. In these cases, the lighting devices 20 may be installed so as to be embedded in the front seats 540.

[0118] (Eighth Modification) The fixture 1311 does not necessarily have to be provided, and any other configuration may be used as long as it can irradiate the occupant with indirect illumination light. For example, the lighting device 31 may be provided forward (toward the front seats) of the display device 40, and an end of the display device 40 may also serve as the fixture. The same applies to the fixture 1312.

[0119] The present disclosure is useful in the technical field of in-vehicle devices.

Claims

1. An illumination system including at least one first lighting device installed on a ceiling inside a vehicle cabin and irradiating awakening light, wherein the at least one first lighting device is a long lighting device including at least one light source and is arranged so that a movable area of a first seat provided in the vehicle cabin overlaps at least partially when viewed from above.

2. The illumination system according to claim 1, wherein the at least one first lighting device includes a long light guide, and the at least one light source is provided such that a light emitting surface faces the longitudinal direction of the light guide at one end in the longitudinal direction of the light guide.

3. The illumination system according to claim 1 or 2, further including a second lighting device arranged to face the front of the first seat.

4. The illumination system according to claim 3, wherein the first seat is a rear seat, and the second lighting device is installed between the front seat and the rear seat.

5. The illumination system according to claim 1 or 2, wherein the at least one first lighting device has a variable illuminance, and further includes a control unit configured to change the illuminance of the at least one first lighting device over time in an awakening phase for awakening an occupant.

6. The illumination system according to claim 3, wherein the second lighting device has a variable illuminance, and further includes a control unit configured to change the illuminance of the second lighting device over time.

7. The ceiling includes a mounting opening for mounting each of the at least one first lighting device and a reinforcing member provided along the mounting opening on the back surface of the ceiling. Each of the at least one first lighting devices includes a housing embedded in the mounting opening, a first cantilever spring connected to one side surface in the longitudinal direction of the housing, and a second cantilever spring connected to the other side surface in the longitudinal direction of the housing, and free ends of the first and second cantilever springs are in contact with the reinforcing member. The illumination system according to claim 1 or 2.

8. The illumination system according to claim 1 or 2, wherein the luminance of the at least one light source is set such that the illuminance on the front surface of the headrest portion of the first seat is at least 100 lx.

9. The lighting system according to claim 5, wherein the control unit increases the illuminance of the at least one first lighting device from the off state to the maximum illuminance over time in the waking phase.

10. The lighting system according to claim 1 or 2, further comprising at least one third lighting device, wherein the at least one third lighting device is indirect lighting installed between the front seat and the rear seat.

11. The lighting system according to claim 1 or 2, further comprising an acoustic device installed on the ceiling, wherein the acoustic device is arranged so that at least a part thereof overlaps with the movable area of the first seat when viewed from above.

12. The lighting system according to claim 1 or 2, further comprising a sound collection device installed on the ceiling, wherein the sound collection device is arranged so that at least a part thereof overlaps with the movable area of the first seat when viewed from above.

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