Lighting device

Abstract

To provide an illumination device capable of suppressing increase in the size in a vertical direction of a vehicle.SOLUTION: An illumination device 10 is an illumination device mounted on a ceiling 1 inside a vehicle, and includes a light source 22 for emitting light lighting the interior of the vehicle, a light guide body 24 which makes light emitted from the light source 22 incident thereon and emits the incident light, a first flow channel (flow channel 70) which extends to cross a vertical direction of the vehicle and is positioned at the same position as at least one of the light source 22 and the light guide body 24 in the vertical direction, in a state where the illumination device 10 is mounted on the ceiling 1, and an air blower 34 which generates an air flow that passes through the first flow channel (flow channel 70) after having been sucked by the illumination device 10, and is blown from the illumination device 10 after having passed through the first flow passage (flow channel 70).SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a lighting device.

Background Art

[0002] Conventionally, a lighting device provided in the interior of a vehicle is known. For example, as an example of a lighting device, Patent Document 1 discloses a vehicle air cleaner having a casing formed with an air passage therein and indirect lighting disposed in a gap between the ceiling and the casing.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the vehicle air cleaner of Patent Document 1, since the indirect lighting is disposed in the gap between the ceiling and the casing, there is a problem that the vehicle air cleaner increases in size in the vertical direction of the vehicle.

[0005] Therefore, the present disclosure provides a lighting device capable of suppressing an increase in size in the vertical direction of a vehicle.

Means for Solving the Problems

[0006] A lighting device according to one aspect of the present disclosure is a lighting device mounted on the ceiling of the interior of a vehicle, comprising: a light source that emits light for illuminating the interior; a light guide into which the light emitted from the light source is incident and which causes the incident light to be emitted; a first flow path that extends so as to intersect the vertical direction of the vehicle and is located in the same position in the vertical direction as at least one of the light source and the light guide, when the lighting device is mounted on the ceiling; and a blower that generates an airflow that is drawn into the lighting device, passes through the first flow path, and is blown out from the lighting device after passing through the first flow path. [Effects of the Invention]

[0007] The lighting device of this disclosure can suppress the increase in size in the vertical direction of the vehicle. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a front view showing a lighting device and the like according to an embodiment. [Figure 2] Figure 2 is a cross-sectional view showing the lighting device and other components shown in Figure 1. [Figure 3] Figure 3 is a plan view showing a part of the lighting device shown in Figure 1. [Figure 4] Figure 4 is a perspective view showing a part of the lighting device shown in Figure 1. [Figure 5] Figure 5 is a cross-sectional perspective view showing a part of the lighting device shown in Figure 1. [Modes for carrying out the invention]

[0009] A lighting device according to one aspect of the present disclosure is a lighting device mounted on the ceiling of the interior of a vehicle, comprising: a light source that emits light for illuminating the interior; a light guide into which the light emitted from the light source is incident and which causes the incident light to be emitted; a first flow path that extends so as to intersect the vertical direction of the vehicle and is located in the same position in the vertical direction as at least one of the light source and the light guide, when the lighting device is mounted on the ceiling; and a blower that generates an airflow that is drawn into the lighting device, passes through the first flow path, and is blown out from the lighting device after passing through the first flow path.

[0010] According to this, the first channel extends so as to intersect with the vertical direction of the vehicle when the lighting device is mounted on the ceiling, and is located in the same position in the vertical direction as at least one of the light source and the light guide. Therefore, it is possible to prevent the first channel and at least one of the light source and the light guide from being aligned in the vertical direction of the vehicle, and to prevent the lighting device from becoming larger in the vertical direction of the vehicle.

[0011] Furthermore, when the lighting device is mounted on the ceiling, the statement that the first channel is in the same position as the light source in the vertical direction of the vehicle includes the case where, when the lighting device is mounted on the ceiling, at least a portion of the first channel is in the same position as at least a portion of the light source in the vertical direction of the vehicle. Also, when the lighting device is mounted on the ceiling, the statement that the first channel is in the same position as the light guide in the vertical direction of the vehicle includes the case where, when the lighting device is mounted on the ceiling, at least a portion of the first channel is in the same position as at least a portion of the light guide in the vertical direction of the vehicle.

[0012] Furthermore, in a lighting device according to one aspect of the present disclosure, the first channel is located in the same position in the vertical direction as the light guide when the lighting device is mounted on the ceiling, and the light guide has a first surface opposite to the first channel and a second surface on the side of the first channel, and includes a second channel that is open on each of the first and second surfaces and connected to the first channel.

[0013] According to this, the second channel opens on both the first and second surfaces of the light guide and connects to the first channel. Therefore, even when the lighting device is mounted on the ceiling and the first channel and the light guide are located at the same position in the vertical direction of the vehicle, obstruction of the airflow by the light guide can be suppressed.

[0014] Furthermore, in a lighting device according to one aspect of the present disclosure, the light guide has a notch that is recessed upward in the vertical direction when the lighting device is mounted on the ceiling and extends from the first surface to the second surface, and a part of the second flow path may be formed by the notch.

[0015] According to this, a portion of the second channel can be easily formed by the notch in the light guide.

[0016] Furthermore, in a lighting device according to one aspect of the present disclosure, the first surface may include a first inclined surface that, when the lighting device is mounted on the ceiling, is positioned on the opposite side from the second surface as it moves upward in the vertical direction.

[0017] According to this, the airflow exiting from the opening on the first surface can be directed along the first inclined surface, so that when the lighting device is mounted on the ceiling, the airflow can be directed diagonally upward.

[0018] Furthermore, in a lighting device according to one aspect of the present disclosure, the lighting device comprises a housing that opens upward in the vertical direction when mounted on the ceiling and houses the light source and the light guide, the housing having a wall portion located on the opposite side of the second surface with respect to the first surface, and the first inclined surface may extend above the wall portion in the vertical direction when the lighting device is mounted on the ceiling.

[0019] According to this, in a state where the lighting device is attached to the ceiling, the airflow coming out from the opening in the first surface can be easily made to flow obliquely upward.

[0020] Further, in the lighting device according to one aspect of the present disclosure, the light source is located below the light guide body in the vertical direction and emits the light upward in the vertical direction in a state where the lighting device is attached to the ceiling, and the second surface includes a second inclined surface that is inclined so as to be located on the first surface side as it goes upward in the vertical direction in a state where the lighting device is attached to the ceiling. The light guide body has an incident surface that is located above the light source in the vertical direction and to which the light emitted from the light source is incident, and an emission surface that is located on the lower side in the vertical direction as it goes from the second surface side to the first surface side and emits the light incident from the incident surface in a state where the lighting device is attached to the ceiling. The second inclined surface reflects the light incident from the incident surface toward the first inclined surface, the first inclined surface reflects the light reflected by the second inclined surface toward the emission surface, and the emission surface may emit the light reflected by the first inclined surface.

[0021] According to this, since the light emitted from the light source can be reflected inside the light guide body and then emitted from the light guide body, the light emitted from the light source can be diffused to illuminate the interior of the room.

[0022] Further, in the lighting device according to one aspect of the present disclosure, the emission surface may be a concave curved surface.

[0023] According to this, the light emitted from the light source can be further diffused to illuminate the interior of the room.

[0024] Furthermore, in a lighting device according to one aspect of the present disclosure, the device comprises a plurality of light sources and a housing that houses the plurality of light sources and the light guide, wherein the plurality of light sources are arranged in an annular shape along the outer circumference of the housing when viewed from the up and down direction when the lighting device is mounted on the ceiling, and the light guide may overlap with the plurality of light sources and be annular when viewed from the up and down direction when the lighting device is mounted on the ceiling.

[0025] According to this, the area around the enclosure can be easily illuminated.

[0026] Furthermore, a lighting device according to one aspect of this disclosure may include an air purifier that uses the airflow to purify the air in the room.

[0027] According to this method, the air inside a vehicle can be easily purified.

[0028] The embodiments will be described in detail below with reference to the drawings.

[0029] The embodiments described below are all general or specific examples. The numerical values, shapes, materials, components, arrangement and connection configurations of components, steps, and the order of steps shown in the following embodiments are examples only and are not intended to limit this disclosure. Furthermore, any components in the following embodiments that are not described in an independent claim will be described as optional components.

[0030] Furthermore, each figure is a schematic diagram and not necessarily a strictly accurate representation. Also, the same component is denoted by the same reference numeral in each figure.

[0031] (Embodiment) Figure 1 is a front view showing the lighting device 10 etc. according to an embodiment. Figure 1 is a view of the lighting device 10 etc. from the front in the front-rear direction of the vehicle. Note that in Figure 1, the ceiling 1 is shown in cross-section. Figure 2 is a cross-sectional view showing the lighting device 10 etc. of Figure 1. Figure 2 is a view of a cross section perpendicular to the left-right direction of the vehicle, seen from the left in the left-right direction of the vehicle. Note that in Figure 2, the blowers 34, 36 and air purifier 38 are shown in their external appearance rather than in cross-section. Figure 3 is a plan view showing a part of the lighting device 10 of Figure 1. In Figure 3, the mounting part 12 and cover part 14 are not shown. Figure 4 is a perspective view showing a part of the lighting device 10 of Figure 1. Specifically, Figure 4 is a perspective view showing the vicinity of the light guide 24 in the lighting device 10. In Figure 4, the mounting part 12 and cover part 14 are not shown. Figure 5 is a cross-sectional perspective view showing a part of the lighting device 10 of Figure 1. Specifically, Figure 5 is a cross-sectional perspective view showing the vicinity of the light guide 24 in the lighting device 10. In Figure 5, the mounting portion 12 and the cover portion 14 are not shown.

[0032] In the following, the front-to-back direction of a vehicle may be simply referred to as the "front-to-back direction." Similarly, the left-to-right direction of a vehicle may be simply referred to as the "left-to-right direction." Furthermore, the up-and-down direction of a vehicle may be simply referred to as the "up-and-down direction."

[0033] As shown in Figure 1, the lighting device 10 is mounted on the ceiling 1 inside the vehicle. That is, the lighting device 10 is located inside the vehicle and mounted on the ceiling 1 inside the vehicle. For example, the vehicle is a car, ship, or aircraft. For example, a vehicle is an automobile. The lighting device 10 illuminates the interior of the vehicle. In this embodiment, the lighting device 10 is an indirect lighting device and illuminates the interior of the vehicle indirectly. Specifically, the lighting device 10 illuminates the interior of the vehicle indirectly by shining light onto the ceiling 1 (see the thick arrow in Figure 1). Note that, for example, the lighting device 10 does not have to be an indirect lighting device and may directly illuminate the interior of the vehicle. Specifically, for example, the lighting device 10 may directly illuminate the interior of the vehicle by emitting light on the opposite side from the ceiling 1.

[0034] As shown in Figures 1 to 5, the lighting device 10 comprises a mounting section 12, a cover section 14, a main body section 16, a circuit board 18, a housing 20, multiple light sources 22, a light guide 24, multiple flow paths 26, 28, 30, 32, multiple blowers 34, 36, and an air purifier 38.

[0035] The mounting portion 12 is attached to the ceiling 1. For example, the mounting portion 12 is attached to the ceiling 1 by bolts (not shown) or the like.

[0036] The cover portion 14 is attached to the mounting portion 12. For example, the cover portion 14 has a hook portion (not shown) that can be hooked onto the mounting portion 12, and is attached to the mounting portion 12 by being hooked onto the mounting portion 12. The cover portion 14 is located above the main body portion 16 when the lighting device 10 is mounted on the ceiling 1. In this embodiment, when the lighting device 10 is mounted on the ceiling 1 and viewed from above, the outer periphery of the cover portion 14 is located above the second inclined surface 68 included in the second surface 54 of the light guide body 24, which will be described later, and faces the second inclined surface 68.

[0037] The main body 16 is attached to the cover 14. For example, the main body 16 is attached to the cover 14 by bolts (not shown) or the like. The main body 16 has a plurality of grooves 40, 42, 44, and 46. Each of the plurality of grooves 40, 42, 44, and 46 is recessed downward in the vertical direction when the lighting device 10 is attached to the ceiling 1, and extends in a direction intersecting the vertical direction.

[0038] The substrate 18 is a substrate on which multiple light sources 22 are fixed. The substrate 18 is attached to the cover portion 14 together with the main body portion 16. When the lighting device 10 is mounted on the ceiling 1, the substrate 18 overlaps with each of the multiple light sources 22 and is annular when viewed from above or below.

[0039] The housing 20 houses multiple light sources 22 and light guides 24. When the lighting device 10 is mounted on the ceiling 1, the housing 20 is open upward in the vertical direction and is positioned below and to the side of the multiple light sources 22 and light guides 24. The housing 20 is attached to the main body 16. For example, the housing 20 is attached to the main body 16 by bolts (not shown) or the like. The housing 20 has a wall portion 48.

[0040] The wall portion 48 is located on the opposite side from the second surface 54, with reference to the first surface 52 of the light guide body 24, which will be described later. When the lighting device 10 is mounted on the ceiling 1, the wall portion 48 is annular when viewed from above. The wall portion 48 is separated from the first surface 52 by a gap.

[0041] Each of the multiple light sources 22 emits light to illuminate the room. In this embodiment, the light emitted from each of the multiple light sources 22 enters the light guide 24, exits the light guide 24 after entering it, and is reflected by the ceiling 1 after exiting the light guide 24 to illuminate the room. For example, each of the multiple light sources 22 is an LED light source or the like.

[0042] Each of the multiple light sources 22 is located below the light guide 24 in the vertical direction and emits light upward in the vertical direction when the lighting device 10 is mounted on the ceiling 1.

[0043] The multiple light sources 22 are arranged in a ring shape when viewed from above when the lighting device 10 is mounted on the ceiling 1 (see the dashed rectangle in Figure 3). In this embodiment, the multiple light sources 22 are arranged in a ring shape along the outer circumference of the housing 20 when viewed from above when the lighting device 10 is mounted on the ceiling 1. Specifically, in this embodiment, the multiple light sources 22 are arranged in a ring shape along the wall portion 48 when viewed from above when the lighting device 10 is mounted on the ceiling 1.

[0044] The light guide 24 receives light emitted from each of the multiple light sources 22 and causes the incident light to exit. When the lighting device 10 is mounted on the ceiling 1, the light guide 24 overlaps with the multiple light sources 22 and is annular when viewed from above. In this embodiment, the light guide 24 is formed annularly by a single component. However, for example, the light guide 24 may be formed annularly by arranging multiple components in an annular shape. As shown in Figures 2, 5, etc., the light guide 24 has a plurality of recesses 50, a first surface 52, a second surface 54, an exit surface 56, and a plurality of notches 58.

[0045] The multiple recesses 50 accommodate multiple light sources 22. The multiple recesses 50 are provided in a one-to-one correspondence with the multiple light sources 22. Inside each of the multiple recesses 50, one light source 22 from the multiple light sources 22 corresponding to that recess 50 is arranged. Each of the multiple recesses 50 is recessed upward in the vertical direction when the lighting device 10 is mounted on the ceiling 1. When viewed from the vertical direction, the multiple recesses 50 are arranged in a ring shape when the lighting device 10 is mounted on the ceiling 1.

[0046] Each of the bottom surfaces 60 of the multiple recesses 50 is located above the light source 22 in the vertical direction when the lighting device 10 is mounted on the ceiling 1, and is an example of an incident surface to which light emitted from the light source 22 enters.

[0047] The first surface 52 is the surface of the light guide 24 opposite to the first flow path, as shown in Figures 2, 5, etc. In other words, in this embodiment, the first surface 52 is the surface of the light guide 24 opposite to the flow paths 70 (76, 82, 86). The first surface 52 is annular when viewed from above when the lighting device 10 is mounted on the ceiling 1. The first surface 52 includes a vertical surface 62 and a first inclined surface 64.

[0048] The vertical plane 62 is a plane parallel to the vertical direction when the lighting device 10 is installed on the ceiling 1. When viewed from above, the vertical plane 62 is arranged in a ring shape when the lighting device 10 is installed on the ceiling 1. Specifically, when viewed from above, the vertical plane 62 is arranged in a ring shape along the arrangement of the multiple light sources 22 when the lighting device 10 is installed on the ceiling 1.

[0049] The first inclined surface 64 is inclined such that, when the lighting device 10 is mounted on the ceiling 1, it is positioned opposite to the second surface 54 as it moves upward in the vertical direction. The first inclined surface 64 is connected to the upper end of the vertical surface 62 when the lighting device 10 is mounted on the ceiling 1. The first inclined surface 64 is annular when viewed from above when the lighting device 10 is mounted on the ceiling 1. Specifically, when the first inclined surface 64 is viewed from above when the lighting device 10 is mounted on the ceiling 1, it is annular along the arrangement of the multiple light sources 22. The first inclined surface 64 extends above the wall portion 48 in the vertical direction when the lighting device 10 is mounted on the ceiling 1. In other words, the first inclined surface 64 extends from below the upper end of the wall portion 48 to above the upper end of the wall portion 48 when the lighting device 10 is mounted on the ceiling 1. The first inclined surface 64 reflects the light emitted from the light sources 22 that is incident on the light guide 24. For example, the first inclined surface 64 reflects the light reflected by the second inclined surface 68 toward the emission surface 56.

[0050] The second surface 54 is the surface on the first flow path side of the light guide 24, as shown in Figures 2, 5, etc. In other words, in this embodiment, the second surface 54 is the surface on the flow path 70 (76, 82, 86) side. The second surface 54 is annular when viewed from above when the lighting device 10 is mounted on the ceiling 1. The second surface 54 includes a vertical surface 66 and a second inclined surface 68.

[0051] The vertical plane 66 is a plane parallel to the vertical direction when the lighting device 10 is installed on the ceiling 1. When viewed from above, the vertical plane 66 is arranged in a ring shape when the lighting device 10 is installed on the ceiling 1. Specifically, when viewed from above, the vertical plane 66 is arranged in a ring shape along the arrangement of the multiple light sources 22 when the lighting device 10 is installed on the ceiling 1.

[0052] The second inclined surface 68 is inclined such that, when the lighting device 10 is mounted on the ceiling 1, it is positioned towards the first surface 52 as it moves upward in the vertical direction. The second inclined surface 68 is connected to the upper end of the vertical surface 66 when the lighting device 10 is mounted on the ceiling 1. When viewed from above when the lighting device 10 is mounted on the ceiling 1, the second inclined surface 68 is annular. Specifically, when viewed from above when the lighting device 10 is mounted on the ceiling 1, the second inclined surface 68 is annular along the arrangement of the multiple light sources 22. The second inclined surface 68 reflects light emitted from the light sources 22 and incident on the light guide 24. For example, the second inclined surface 68 reflects light incident from the bottom surface 60 toward the first inclined surface 64.

[0053] The emission surface 56 is located on the lower side in the vertical direction as you move from the second surface 54 side towards the first surface 52 side when the lighting device 10 is mounted on the ceiling 1, and emits light incident from the bottom surface 60. The emission surface 56 emits light reflected from the first inclined surface 64. The emission surface 56 is a concave curved surface. However, for example, the emission surface 56 may be a convex curved surface or a flat surface.

[0054] In this embodiment, light emitted from each of the multiple light sources 22 enters the light guide 24 from the bottom surface 60, then, for example, is reflected by the second inclined surface 68, reflected by the first inclined surface 64 after being reflected by the second inclined surface 68, and then exits to the outside of the light guide 24 from the exit surface 56 after being reflected by the first inclined surface 64 (see the thick solid arrows in Figures 2 and 5).

[0055] Each of the multiple notches 58 is recessed upward in the vertical direction when the lighting device 10 is mounted on the ceiling 1, and is formed from the first surface 52 to the second surface 54. In this embodiment, each of the multiple notches 58 is recessed in a roughly V shape so that the width gradually narrows upward in the vertical direction when the lighting device 10 is mounted on the ceiling 1. For example, each of the multiple notches 58 may be recessed in a roughly U shape when the lighting device 10 is mounted on the ceiling 1. When viewed from the vertical direction, the multiple notches 58 are arranged in an annular shape when the lighting device 10 is mounted on the ceiling 1. The multiple notches 58 are arranged such that one notch 58 is located between two adjacent light sources 22 among the multiple light sources 22.

[0056] The flow path 26 is a flow path through which the airflow generated by the blower 34 flows. The flow path 26 is a flow path that passes inside the lighting device 10. The flow path 26 includes the flow path 70, the flow path 72, and the flow path 74.

[0057] The flow path 70 is an example of a first flow path that extends in a direction intersecting the vertical direction and is located at the same position in the vertical direction as at least one of the light source 22 and the light guide 24 when the lighting device 10 is mounted on the ceiling 1. In other words, when the lighting device 10 is mounted on the ceiling 1, the flow path 70 extends in a direction intersecting the vertical direction and is provided at the same height in the vertical direction as at least one of the light source 22 and the light guide 24, as shown in Figures 2, 5, etc.

[0058] In this embodiment, as shown in Figure 3 and other figures, the flow path 70 extends to the right in the left-right direction and then extends forward in the front-back direction when the lighting device 10 is mounted on the ceiling 1. Also, when the lighting device 10 is mounted on the ceiling 1, the flow path 70 is located at the same position as the light source 22 and the light guide 24 in the vertical direction, as shown in Figures 2 and 5. In other words, when the lighting device 10 is mounted on the ceiling 1, the flow path 70 is provided at the same height as the light source 22 and the light guide 24 in the vertical direction. The flow path 70 is located inside the light guide 24. The flow path 70 is formed by a groove 40 and a cover 14, etc.

[0059] The flow path 72 is an example of a second flow path that opens on the first surface 52 and the second surface 54 respectively and is connected to the first flow path (flow path 70).

[0060] In this embodiment, the flow path 72 is connected to one end of the flow path 70 and communicates with the flow path 70. A portion of the flow path 72 is formed by a notch 58. Specifically, the flow path 72 is formed by the notch 58 and the substrate 18, etc. Here, multiple flow paths 72 are connected to one end of the flow path 70.

[0061] The flow path 74 is an example of a second flow path that opens on the first surface 52 and the second surface 54 respectively and is connected to the first flow path (flow path 70).

[0062] In this embodiment, the flow path 74 is connected to the other end of the flow path 70 and communicates with the flow path 70. A portion of the flow path 74 is formed by a notch 58. Specifically, the flow path 74 is formed by the notch 58 and the main body 16, etc. Here, multiple flow paths 74 are connected to the other end of the flow path 70.

[0063] The flow path 28 is a flow path through which the airflow generated by the blower 36 flows. The flow path 28 is a flow path that passes inside the lighting device 10. The flow path 28 includes the flow path 76, the flow path 78, and the flow path 80.

[0064] The flow path 76 is an example of a first flow path that extends in a direction intersecting the vertical direction and is located at the same position in the vertical direction as at least one of the light source 22 and the light guide 24 when the lighting device 10 is mounted on the ceiling 1. In other words, when the lighting device 10 is mounted on the ceiling 1, the flow path 76 extends in a direction intersecting the vertical direction and is provided at the same height in the vertical direction as at least one of the light source 22 and the light guide 24, as shown in Figure 2, etc.

[0065] In this embodiment, as shown in Figure 3, the flow path 76 extends to the right in the left-right direction and then extends to the rear in the front-back direction when the lighting device 10 is mounted on the ceiling 1. Also, as shown in Figure 2, the flow path 76 is located at the same position as the light source 22 and the light guide 24 in the vertical direction when the lighting device 10 is mounted on the ceiling 1. In other words, the flow path 76 is provided at the same height as the light source 22 and the light guide 24 in the vertical direction when the lighting device 10 is mounted on the ceiling 1. The flow path 76 is located inside the light guide 24. The flow path 76 is formed by a groove 42 and a cover 14, etc.

[0066] The flow path 78 is an example of a second flow path that opens on the first surface 52 and the second surface 54 respectively and is connected to the first flow path (flow path 76).

[0067] In this embodiment, the flow path 78 is connected to one end of the flow path 76 and communicates with the flow path 76. A portion of the flow path 78 is formed by a notch 58. Specifically, the flow path 78 is formed by the notch 58 and the substrate 18, etc. Here, multiple flow paths 78 are connected to one end of the flow path 76.

[0068] The flow path 80 is an example of a second flow path that opens on the first surface 52 and the second surface 54 respectively and is connected to the first flow path (flow path 76).

[0069] In this embodiment, the flow path 80 is connected to the other end of the flow path 76 and communicates with the flow path 76. A portion of the flow path 80 is formed by a notch 58. Specifically, the flow path 80 is formed by the notch 58 and the main body 16, etc. Here, multiple flow paths 80 are connected to the other end of the flow path 76.

[0070] The flow path 30 is a flow path through which the airflow generated by the air purifier 38 flows. The flow path 30 is a flow path that passes inside the lighting device 10. The flow path 30 includes the flow path 82 and the flow path 84.

[0071] The flow path 82 is an example of a first flow path that extends in a direction intersecting the vertical direction and is located at the same position in the vertical direction as at least one of the light source 22 and the light guide 24 when the lighting device 10 is mounted on the ceiling 1. In other words, when the lighting device 10 is mounted on the ceiling 1, the flow path 82 extends in a direction intersecting the vertical direction and is located at the same height in the vertical direction as at least one of the light source 22 and the light guide 24.

[0072] In this embodiment, as shown in Figure 3 and other figures, the flow path 82 extends forward in the front-to-back direction when the lighting device 10 is mounted on the ceiling 1. Furthermore, when the lighting device 10 is mounted on the ceiling 1, the flow path 82 is located at the same position as the light guide 24 in the vertical direction. In other words, when the lighting device 10 is mounted on the ceiling 1, the flow path 82 is provided at the same height as the light guide 24 in the vertical direction. The flow path 82 is located inside the light guide 24. The flow path 82 is formed by a groove 44 and a cover 14, etc.

[0073] The flow path 84 is an example of a second flow path that opens on the first surface 52 and the second surface 54 respectively and is connected to the first flow path (flow path 82).

[0074] In this embodiment, the flow path 84 is connected to one end of the flow path 82 and communicates with the flow path 82. A portion of the flow path 84 is formed by a notch 58. Specifically, the flow path 84 is formed by the notch 58 and the main body 16, etc.

[0075] The flow path 32 is a flow path through which the airflow generated by the air purifier 38 flows. The flow path 32 is a flow path that passes inside the lighting device 10. The flow path 32 includes the flow path 86 and the flow path 88.

[0076] The flow path 86 is an example of a first flow path that extends in a direction intersecting the vertical direction and is located at the same position in the vertical direction as at least one of the light source 22 and the light guide 24 when the lighting device 10 is mounted on the ceiling 1. In other words, when the lighting device 10 is mounted on the ceiling 1, the flow path 86 extends in a direction intersecting the vertical direction and is located at the same height in the vertical direction as at least one of the light source 22 and the light guide 24.

[0077] In this embodiment, the flow path 86 extends towards the rear in the front-to-back direction when the lighting device 10 is mounted on the ceiling 1. Furthermore, when the lighting device 10 is mounted on the ceiling 1, the flow path 86 is located at the same position as the light guide 24 in the vertical direction. In other words, when the lighting device 10 is mounted on the ceiling 1, the flow path 86 is provided at the same height as the light guide 24 in the vertical direction. The flow path 86 is located inside the light guide 24. The flow path 86 is formed by a groove 46 and a cover 14, etc.

[0078] The flow path 88 is an example of a second flow path that opens on the first surface 52 and the second surface 54 respectively and is connected to the first flow path (flow path 86).

[0079] In this embodiment, the flow path 88 is connected to one end of the flow path 86 and communicates with the flow path 86. A portion of the flow path 88 is formed by a notch 58. Specifically, the flow path 88 is formed by the notch 58 and the main body 16, etc.

[0080] The blower 34 generates an airflow that is drawn into the lighting device 10, passes through the flow path 70, and is then blown out of the lighting device 10 (see the thick dashed arrows in Figures 2 to 5).

[0081] In this embodiment, the airflow generated by the blower 34 is drawn into the lighting device 10 from between the wall 48 and the light guide 24, passes through the flow path 72, then through the flow path 70, then through the flow path 70, then through the flow path 74, and after passing through the flow path 74, is blown out to the outside of the lighting device 10 from between the wall 48 and the light guide 24 (see the thick dashed arrows in Figure 2, etc.). The blower 34 is located within the flow path 70.

[0082] The blower 36 generates an airflow that is drawn into the lighting device 10, passes through the flow path 76, and is then blown out of the lighting device 10 (see the thick dashed arrows in Figures 2 and 3).

[0083] In this embodiment, the airflow generated by the blower 36 is drawn into the lighting device 10 from between the wall 48 and the light guide 24, passes through the flow path 78, then through the flow path 76, then through the flow path 76, then through the flow path 80, and finally blown out to the outside of the lighting device 10 from between the wall 48 and the light guide 24 (see the thick dashed arrows in Figure 2, etc.). The blower 36 is installed in the flow path 76.

[0084] The air purifier 38 cleans the indoor air using airflow. In this embodiment, the air purifier 38 has a blower 90 that generates an airflow that is drawn into the lighting device 10, passes through the flow path 82(86), and is blown out from the lighting device 10 after passing through the flow path 82(86) (see the thick dashed arrow in Figure 3), and uses this airflow to clean the indoor air. For example, the air purifier 38 cleans the indoor air by supplying a substance containing components for cleaning the indoor air into the room via the airflow. Note that, for example, the air purifier 38 may be a dust collector or the like.

[0085] The lighting device 10 according to this embodiment has been described above.

[0086] The lighting device 10 according to this embodiment is a lighting device that is installed on the ceiling 1 inside the interior of a vehicle, and comprises a light source 22 that emits light to illuminate the interior, a light guide 24 into which the light emitted from the light source 22 is incident and which causes the incident light to be emitted, a first flow path (flow path 70) that extends so as to intersect with the vertical direction of the vehicle and is located in the same position in the vertical direction as at least one of the light source 22 and the light guide 24, when the lighting device 10 is installed on the ceiling 1, and a blower 34 that generates an airflow that is drawn into the lighting device 10, passes through the first flow path (flow path 70), and is blown out from the lighting device 10 after passing through the first flow path (flow path 70).

[0087] According to this, the first channel (channel 70), when the lighting device 10 is mounted on the ceiling 1, extends so as to intersect with the vertical direction of the vehicle and is located in the same position in the vertical direction as at least one of the light source 22 and the light guide 24. Therefore, it is possible to prevent the first channel (channel 70) and at least one of the light source 22 and the light guide 24 from being aligned in the vertical direction of the vehicle, and to prevent the lighting device 10 from becoming larger in the vertical direction of the vehicle.

[0088] Furthermore, in the lighting device 10 according to this embodiment, the first flow path (flow path 70) is located in the same position in the vertical direction as the light guide 24 when the lighting device 10 is attached to the ceiling 1, and the light guide 24 has a first surface 52 on the opposite side of the first flow path (flow path 70) and a second surface 54 on the side of the first flow path (flow path 70), and each of the first surface 52 and the second surface 54 has an opening and is provided with a second flow path (flow path 72) connected to the first flow path (flow path 70).

[0089] According to this, the second channel (channel 72) opens on the first surface 52 and the second surface 54 of the light guide 24, respectively, and is connected to the first channel (channel 70). Therefore, even when the lighting device 10 is mounted on the ceiling 1, and the first channel (channel 70) and the light guide 24 are located at the same position in the vertical direction of the vehicle, obstruction of the airflow by the light guide 24 can be suppressed.

[0090] Furthermore, in the lighting device 10 according to this embodiment, the light guide 24 has a notch 58 that is recessed upward in the vertical direction when the lighting device 10 is attached to the ceiling 1, and is formed from the first surface 52 to the second surface 54, and a part of the second flow path (flow path 72) is formed by the notch 58.

[0091] According to this, a portion of the second channel (channel 72) can be easily formed by the notch 58 in the light guide 24.

[0092] Furthermore, in the lighting device 10 according to this embodiment, the first surface 52 includes a first inclined surface 64 that, when the lighting device 10 is mounted on the ceiling 1, is inclined to be on the opposite side from the second surface 54 as it moves upward in the vertical direction.

[0093] According to this, the airflow exiting from the opening on the first surface 52 can be directed along the first inclined surface 64, so that when the lighting device 10 is attached to the ceiling 1, the airflow can be directed diagonally upward.

[0094] Furthermore, in the lighting device 10 according to this embodiment, when the lighting device 10 is mounted on the ceiling 1, it has a housing 20 that opens upward in the vertical direction and houses a light source 22 and a light guide 24. The housing 20 has a wall portion 48 located on the opposite side of the second surface 54 with respect to the first surface 52, and the first inclined surface 64 extends above the wall portion 48 in the vertical direction when the lighting device 10 is mounted on the ceiling 1.

[0095] According to this, when the lighting device 10 is attached to the ceiling 1, the airflow coming out of the opening on the first surface 52 can be easily directed diagonally upward.

[0096] Furthermore, in the lighting device 10 according to this embodiment, the light source 22 is located below the light guide 24 in the vertical direction and emits light upward in the vertical direction when the lighting device 10 is mounted on the ceiling 1, the second surface 54 includes a second inclined surface 68 that is inclined to be located towards the first surface 52 as it goes upward in the vertical direction when the lighting device 10 is mounted on the ceiling 1, and the light guide 24 is located above the light source 22 in the vertical direction and the light source The lighting device 10 has an incident surface (bottom surface 60) into which light emitted from 22 enters, and an exit surface 56 which is located on the lower side in the vertical direction as you move from the second surface 54 side towards the first surface 52 side when the lighting device 10 is attached to the ceiling 1, and which emits the light that entered from the incident surface (bottom surface 60). The second inclined surface 68 reflects the light that entered from the incident surface (bottom surface 60) toward the first inclined surface 64, the first inclined surface 64 reflects the light reflected by the second inclined surface 68 toward the exit surface 56, and the exit surface 56 emits the light that was reflected by the first inclined surface 64.

[0097] According to this, the light emitted from the light source 22 can be reflected within the light guide 24 and then emitted from the light guide 24, thus diffusing the light emitted from the light source 22 to illuminate the room.

[0098] Furthermore, in the lighting device 10 according to this embodiment, the emission surface 56 is a concave curved surface.

[0099] According to this, the light emitted from the light source 22 can be further diffused to illuminate the room.

[0100] Furthermore, the lighting device 10 according to this embodiment comprises a plurality of light sources 22 and a housing 20 that houses the plurality of light sources 22 and a light guide 24. When the lighting device 10 is mounted on the ceiling 1, the plurality of light sources 22 are arranged in a ring shape along the outer circumference of the housing 20 when viewed from above, and the light guide 24 overlaps with the plurality of light sources 22 and is ring-shaped when viewed from above, when the lighting device 10 is mounted on the ceiling 1.

[0101] According to this, the area around the housing 20 can be easily illuminated.

[0102] Furthermore, the lighting device 10 according to this embodiment is equipped with an air purifier 38 that cleans the indoor air using airflow.

[0103] According to this method, the air inside a vehicle can be easily purified.

[0104] (Note) Based on the above description of embodiments, the following technologies are disclosed.

[0105] (Technology 1) A lighting device installed on the ceiling inside a vehicle, A light source that emits light to illuminate the aforementioned room, A light guide into which the light emitted from the light source is incident and which causes the incident light to be emitted, With the lighting device mounted on the ceiling, a first channel extends so as to intersect the vertical direction of the vehicle and is located in the same position as at least one of the light source and the light guide in the vertical direction, The system includes a blower that generates an airflow that is drawn into the lighting device, passes through the first channel, and is blown out of the lighting device after passing through the first channel. Lighting device.

[0106] (Technology 2) The first channel is located in the same position as the light guide in the vertical direction when the lighting device is mounted on the ceiling. The light guide has a first surface opposite to the first channel and a second surface on the side of the first channel. The first surface and the second surface each have an opening and a second channel connected to the first channel, The lighting device described in Technical 1.

[0107] (Technology 3) The light guide has a notch that is recessed upward in the vertical direction when the lighting device is mounted on the ceiling, and is formed from the first surface to the second surface. A portion of the second flow path is formed by the notch. The lighting device described in Technical 2.

[0108] (Technology 4) The first surface includes a first inclined surface that, when the lighting device is mounted on the ceiling, is positioned on the opposite side from the second surface as it moves upward in the vertical direction. A lighting device as described in Technology 2 or 3.

[0109] (Technology 5) When the lighting device is mounted on the ceiling, it has an opening that faces upward in the vertical direction and comprises a housing that accommodates the light source and the light guide. The housing includes a wall portion located on the opposite side from the second surface with respect to the first surface, The first inclined surface extends above the wall portion in the vertical direction when the lighting device is mounted on the ceiling. The lighting device described in Technical 4.

[0110] (Technology 6) The light source is located below the light guide in the vertical direction and emits light upward in the vertical direction when the lighting device is mounted on the ceiling. The second surface includes a second inclined surface that, when the lighting device is mounted on the ceiling, is positioned toward the first surface as it moves upward in the vertical direction, The light guide has an incident surface located above the light source in the vertical direction when the lighting device is mounted on the ceiling, and into which the light emitted from the light source is incident, and an outgoing surface located on the lower side in the vertical direction as you move from the second surface side toward the first surface side when the lighting device is mounted on the ceiling, and which causes the light incident from the incident surface to be emitted. The second inclined surface reflects the light incident from the incident surface toward the first inclined surface. The first inclined surface reflects the light reflected by the second inclined surface toward the emission surface. The emission surface emits the light reflected by the first inclined surface. A lighting device as described in Technical 4 or 5.

[0111] (Technology 7) The aforementioned exit surface is a concave curved surface. The lighting device described in Technical 6.

[0112] (Technology 8) The system comprises a plurality of light sources and a housing that houses the plurality of light sources and the light guide, The plurality of light sources are arranged in a ring along the outer circumference of the housing when viewed from the top and bottom, when the lighting device is mounted on the ceiling. The light guide is, when the lighting device is mounted on the ceiling, such that it overlaps with the multiple light sources and is annular when viewed from the vertical direction. A lighting device as described in any of Technical 1 to 7.

[0113] (Technology 9) The system includes an air purifier that cleans the air in the room using the aforementioned airflow. A lighting device as described in any of Technical 1 to 8.

[0114] (Other embodiments, etc.) Although one or more embodiments of lighting devices have been described above based on their respective embodiments, this disclosure is not limited to these embodiments. Various modifications of these embodiments that a person skilled in the art could conceive of may also be included within the scope of this disclosure, as long as they do not depart from the spirit of this disclosure.

[0115] In the embodiments described above, the first channel was described as being located at the same position in the vertical direction as both the light source 22 and the light guide 24 when the lighting device 10 is mounted on the ceiling 1, but the invention is not limited to this. For example, when the lighting device is mounted on the ceiling, the first channel may be located at the same position in the vertical direction as only the light source or only the light guide.

[0116] The above-described embodiment explains the case in which the lighting device 10 has multiple light sources 22, but it is not limited to this. For example, the lighting device may have only one light source instead of multiple light sources. In this case, for example, the light guide and the substrate do not have to be annular and may be provided only in the vicinity of the light source.

[0117] In the embodiments described above, the case in which the light source 22 is located below the light guide 24 when the lighting device 10 is mounted on the ceiling 1 was described, but the invention is not limited to this. For example, the light source may be located above the light guide or to the side of the light guide when the lighting device is mounted on the ceiling.

[0118] In the embodiments described above, the case in which the lighting device 10 is provided with a second flow path was explained, but the invention is not limited to this. For example, the lighting device does not need to have a second flow path. In this case, for example, the flow path through which the airflow drawn into the lighting device passes through the first flow path and is blown out from the lighting device after passing through the first flow path should not overlap with the light guide when viewed from above when the lighting device is mounted on the ceiling.

[0119] In the embodiments described above, the case in which the light source 22 is housed in the recess 50 was explained, but the invention is not limited to this. For example, the light guide does not have to have a recess, and the light source does not have to be housed in a recess.

[0120] In the embodiments described above, a case was described in which a part of the second channel is formed by a notch 58, but the invention is not limited thereto. For example, the light guide may have through holes that open on the first and second surfaces, and at least a part of the second channel may be formed by these through holes.

[0121] In the embodiment described above, the lighting device 10 is mounted on the ceiling 1 inside the vehicle's interior such that Figure 1 is a view of the lighting device 10 etc. from the front in the vehicle's front-to-back direction, and Figure 2 is a view of a cross section perpendicular to the vehicle's left-to-right direction, viewed from the left in the vehicle's left-to-right direction. However, the embodiment is not limited to this. For example, the lighting device 10 may be mounted on the ceiling 1 inside the vehicle's interior such that Figure 1 is a view of the lighting device 10 etc. from the left or right in the vehicle's left-to-right direction, and Figure 2 is a view of a cross section perpendicular to the vehicle's front-to-back direction, viewed from the front or rear in the vehicle's front-to-back direction.

[0122] In this case, for example, when the lighting device 10 is mounted on the ceiling 1, the flow path 70 extends backward in the front-to-back direction and then extends to the left in the left-to-right direction; when the lighting device 10 is mounted on the ceiling 1, the flow path 76 extends backward in the front-to-back direction and then extends to the right in the left-to-right direction; when the lighting device 10 is mounted on the ceiling 1, the flow path 82 extends to the left in the left-to-right direction; and when the lighting device 10 is mounted on the ceiling 1, the flow path 86 extends to the right in the left-to-right direction. [Industrial applicability]

[0123] This disclosure is applicable to lighting devices installed inside the interior of vehicles. [Explanation of Symbols]

[0124] 10 Lighting devices 12 Mounting part 14. Cover section 16 Main body 18 circuit boards 20 cabinets 22 Light source 24 Light guide 26, 28, 30, 32 channels 34, 36, 90 Blower 38 Air purifier 40, 42, 44, 46 grooves 48 Wall 50 recesses 52 Page 1 54 2nd page 56 Ejection surface 58 Notch 60 base 62,66 Lead Continent 64 1st slope 68 Second slope 70, 72, 74, 76, 78, 80, 82, 84, 86, 88 channel

Claims

1. A lighting device installed on the ceiling inside a vehicle, A light source that emits light to illuminate the aforementioned room, A light guide into which the light emitted from the light source is incident and which causes the incident light to be emitted, With the lighting device mounted on the ceiling, a first channel extends so as to intersect the vertical direction of the vehicle and is located in the same position as at least one of the light source and the light guide in the vertical direction, The system includes a blower that generates an airflow that is drawn into the lighting device, passes through the first channel, and is blown out from the lighting device after passing through the first channel, The first channel is located in the same position as the light guide in the vertical direction when the lighting device is mounted on the ceiling. The light guide has a first surface opposite to the first channel and a second surface on the side of the first channel. Each of the first and second surfaces has an opening and is provided with a second flow path connected to the first flow path, Lighting device.

2. The light guide has a notch that is recessed upward in the vertical direction when the lighting device is mounted on the ceiling, and is formed from the first surface to the second surface. A portion of the second flow path is formed by the notch. The lighting device according to claim 1.

3. The first surface includes a first inclined surface that, when the lighting device is mounted on the ceiling, is positioned on the opposite side from the second surface as it moves upward in the vertical direction. The lighting device according to claim 1 or 2.

4. When the lighting device is mounted on the ceiling, it has an opening that faces upward in the vertical direction and comprises a housing that accommodates the light source and the light guide. The housing has a wall portion located on the opposite side from the second surface with respect to the first surface, The first inclined surface extends above the wall portion in the vertical direction when the lighting device is mounted on the ceiling. The lighting device according to claim 3.

5. The light source is located below the light guide in the vertical direction and emits light upward in the vertical direction when the lighting device is mounted on the ceiling. The second surface includes a second inclined surface that, when the lighting device is mounted on the ceiling, is positioned toward the first surface as it moves upward in the vertical direction, The light guide has an incident surface located above the light source in the vertical direction when the lighting device is mounted on the ceiling, and into which the light emitted from the light source is incident, and an outgoing surface located on the lower side in the vertical direction as you move from the second surface side toward the first surface side when the lighting device is mounted on the ceiling, and which causes the light incident from the incident surface to be emitted. The second inclined surface reflects the light incident from the incident surface toward the first inclined surface. The first inclined surface reflects the light reflected by the second inclined surface toward the emission surface. The emission surface emits the light reflected by the first inclined surface. The lighting device according to claim 3.

6. The aforementioned exit surface is a concave curved surface. The lighting device according to claim 5.

7. The system comprises a plurality of light sources and a housing that houses the plurality of light sources and the light guide, The plurality of light sources are arranged in a ring along the outer circumference of the housing when viewed from the top and bottom, when the lighting device is mounted on the ceiling. The light guide is, when the lighting device is mounted on the ceiling, such that it overlaps with the multiple light sources and is annular when viewed from the vertical direction. The lighting device according to claim 1 or 2.

8. The system includes an air purifier that cleans the air in the room using the aforementioned airflow. The lighting device according to claim 1 or 2.

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