lighting system

Abstract

The present disclosure addresses the problem of providing an illumination system that makes it easy to image the inner wall surface of a tunnel. An illumination system (A1) comprises a housing (2), a light source (3), an optical member (4), and an imaging unit (5). The housing (2) is installed on the inner wall surface of a tunnel formed along a road. The light source (3) is provided to the housing (2) and emits illumination light. The optical member (4) is provided to the housing (2) and receives incoming illumination light. The imaging unit (5) is provided to the housing (2). The optical member (4) emits first light toward the road and second light toward the inner wall surface. The imaging unit (5) images at least a portion of an illumination range of the second light in the inner wall surface.

Description

[Technical Field]

[0001] The present disclosure relates to lighting systems. [Background technology]

[0002] Conventionally, the inner wall surface of a tunnel has been imaged to inspect the condition of the inner wall surface (cracks, cracks, and rust on the inner wall surface). For example, in Patent Document 1, a work vehicle is equipped with a lighting means and an imaging means, and while the work vehicle is traveling, the lighting means irradiates the inner wall surface of the tunnel with light, and the imaging means images the inner wall surface of the tunnel.

[0003] However, to capture images of the inner wall surface of a tunnel using a work vehicle, it is necessary to restrict the movement of other vehicles and have the work vehicle drive slowly through the tunnel. For this reason, to avoid causing traffic congestion, images were captured during times of low traffic volume, such as at night. Therefore, when using a work vehicle, it was difficult to capture images during the daytime when traffic volume was high.

[0004] Furthermore, in order to improve inspection accuracy, it is necessary to increase the frequency with which work vehicles are driven and the frequency with which images are taken, which requires securing work vehicles and workers.

[0005] As described above, there are various restrictions on using a work vehicle to capture images of the inner wall surface of a tunnel for inspection, making it difficult to easily capture images of the inner wall surface of a tunnel. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-95627 Summary of the Invention

[0007] An object of the present disclosure is to provide a lighting system that can easily capture an image of the inner wall surface of a tunnel.

[0008] An illumination system according to one aspect of the present disclosure includes a housing, a light source, an optical element, and an imaging unit. The housing is installed on an inner wall surface of a tunnel formed along a road. The light source is provided in the housing and emits illumination light. The optical element is provided in the housing and receives the illumination light. The imaging unit is provided in the housing. The optical element emits a first light toward the road and a second light toward the inner wall surface. The imaging unit generates captured image data of at least a portion of the inner wall surface that is irradiated with the second light. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a front view and a top view showing a lighting fixture corresponding to a lighting system according to an embodiment. [Figure 2] FIG. 2 is a plan view showing a light source module of a road light source provided in the lighting fixture of the same. [Figure 3] FIG. 3 is a perspective view showing a road lens provided in the lighting fixture. [Figure 4] FIG. 4 is a plan view showing a road lens provided in the lighting fixture of the same. [Figure 5] FIG. 5 is a cross-sectional view showing a road lens provided in the lighting fixture of the same. [Figure 6] FIG. 6 is a plan view showing a light source module of a ceiling light source provided in the lighting fixture of the same. [Figure 7] FIG. 7 is a perspective view showing a ceiling lens provided in the lighting fixture. [Figure 8] FIG. 8 is a plan view showing a ceiling lens provided in the lighting fixture of the same. [Figure 9] FIG. 9 is a cross-sectional view showing a ceiling lens provided in the lighting fixture of the same. [Figure 10] FIG. 10 is a diagram showing the light distribution characteristics of the above lighting fixture in a tunnel. [Figure 11] FIG. 11 is a diagram showing the light distribution characteristics of the first light from the road lens of the lighting fixture of the same. [Figure 12] FIG. 12 is a diagram showing the light distribution characteristics of the second light from the ceiling lens of the lighting fixture. [Figure 13] FIG. 13 is a block diagram showing the lighting fixture of the same. [Figure 14] FIG. 14 is a front view showing a lighting fixture corresponding to the lighting system according to the first modified example. [Figure 15] FIG. 15 is a diagram showing the light distribution characteristics of the above lighting fixture in a tunnel. [Figure 16] FIG. 16 is a front view showing a lighting fixture corresponding to the lighting system according to the second modification. [Figure 17] FIG. 17 is a plan view showing a light source module of a common light source included in the lighting fixture of the same. [Figure 18] FIG. 18 is a perspective view showing a common lens included in the lighting fixture. [Figure 19] FIG. 19 is a plan view showing a common lens included in the lighting fixture. [Figure 20] FIG. 20 is a cross-sectional view showing a common lens included in the lighting fixture. [Figure 21] FIG. 21 is a diagram showing the light distribution characteristics of the above lighting fixture in a tunnel. [Figure 22] FIG. 22 is a diagram showing the light distribution characteristics of the first light and the second light by the common lens of the lighting fixture of the same. [Figure 23] FIG. 23 is a block diagram showing the lighting fixture of the same. [Figure 24] FIG. 24 is a block diagram showing a lighting system according to a third modified example. [Figure 25] FIG. 25 is a perspective view showing a lighting fixture according to a fourth modified example. [Figure 26] FIG. 26 is a cross-sectional view showing the lighting fixture of the same. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present embodiments relate generally to lighting systems. More particularly, the present disclosure relates to lighting systems for use in at least tunnels.

[0011] The embodiment described below is merely an example of an embodiment of the present disclosure. The present disclosure is not limited to the following embodiment, and various modifications are possible depending on the design, etc., as long as the effects of the present disclosure can be achieved.

[0012] The lighting system of this embodiment is intended to be used mainly in tunnels, but can also be used in other structures such as snow fences and snow walls.

[0013] The lighting system of this embodiment is not limited to being used as a traffic aid, which is a function mainly required of lighting fixtures in tunnels. The lighting system of this embodiment can also be used as a light source that can provide sufficient illuminance for an imaging unit such as a camera to capture images on the dark inner wall surfaces of tunnels where external light does not reach, and can be used at any time.

[0014] Hereinafter, an embodiment will be described with reference to the drawings.

[0015] (1) Implementation form (1.1) Overview of the lighting system 1 shows a lighting fixture 1 as a lighting system A1 of the embodiment. That is, the lighting system A1 is made up of the lighting fixture 1.

[0016] The lighting device 1 includes a housing 2, a light source 3, an optical member 4, and an imaging unit 5.

[0017] The housing 2 is installed on the inner wall surface of a tunnel formed along a road. The light source 3 is provided in the housing 2 and emits illumination light. The optical member 4 is provided in the housing 2 and receives the illumination light. The imaging unit 5 is provided in the housing 2. The optical member 4 emits a first light toward the road and a second light toward the inner wall surface. The imaging unit 5 generates captured image data of at least a portion of the inner wall surface that is irradiated with the second light.

[0018] The above-described lighting fixture 1 can capture images of the inner wall surface of a tunnel without using a work vehicle equipped with a lighting means and an imaging means. Therefore, the lighting fixture 1 can easily capture images of the inner wall surface of a tunnel. The lighting fixture 1 can capture images of the inner wall surface of a tunnel without causing traffic congestion, even during the daytime when traffic is heavy. Furthermore, the lighting fixture 1 does not require a work vehicle or worker to be secured even if the imaging frequency is increased to improve inspection accuracy.

[0019] (1.2) Details As shown in FIG. 10 , a tunnel T1 is formed along a road R1. A vehicle C1 is traveling on the road R1. A lighting device 1 is installed on an inner wall surface T11 of the tunnel T1. The lighting device 1 emits a first light L1 toward the road R1 and a second light L2 toward the inner wall surface T11. The first light L1 is emitted toward the road R1, thereby brightening the field of view of the driver of the vehicle C1 traveling on the road R1 and improving the safety of the vehicle C1 while traveling. The second light L2 is emitted toward the inner wall surface T11 of the tunnel T1, thereby ensuring brightness of the inner wall surface T11. The imaging unit 5 captures an image of at least a portion of an area of ​​the inner wall surface T11 that is included in an illumination range W2 of the second light L2. Note that in FIG. 10 , the arrows of the first light L1 and the second light L2 indicate the optical axes of the first light L1 and the second light L2. The illumination range of the first light L1 is not shown for clarity.

[0020] 1, the lighting device 1 includes a housing 2, a light source 3, an optical member 4, and an imaging unit 5. The lighting device 1 further includes a circuit block 6.

[0021] (1.2.1) Housing As shown in Fig. 1, the housing 2 is a hollow rectangular box having a rectangular front plate 21, a rear plate 22, a left plate 23, a right plate 24, an upper plate 25, and a lower plate 26. The front plate 21 and the rear plate 22 face each other vertically, the left plate 23 and the right plate 24 face each other laterally, and the upper plate 25 and the lower plate 26 face each other vertically. A rectangular opening 2a is formed in the front plate 21. A rectangular opening 2b is formed in the upper plate 25. The openings 2a and 2b may each be covered with a light-transmitting cover.

[0022] As shown in Fig. 10, the housing 2 is attached to the inner wall surface T11 of the tunnel T1 near the center in the height direction (vertical direction). The inner wall surface T11 is a curved surface that has an arc-shaped cross section when viewed from the traveling direction of the vehicle C1, and the housing 2 is attached to the inner wall surface T11 so that the upper plate portion 25 protrudes further into the tunnel T1 than the lower plate portion 26. In other words, the front plate portion 21 of the housing 2 faces diagonally downward toward the road R1. The upper plate portion 25 of the housing 2 faces in a direction along the inner wall surface T11 that extends in an arc shape above the upper plate portion 25.

[0023] (1.2.2) Light source The light source 3 has a plurality of solid-state light-emitting elements. For example, the light source 3 has an LED array in which a plurality of LED (Light Emitting Diode) elements corresponding to a plurality of solid-state light-emitting elements are connected in series. Note that the light source 3 is not limited to a configuration having LED elements as solid-state light-emitting elements. The light source 3 may have other solid-state light-emitting elements, such as organic electroluminescence (OEL) elements or semiconductor laser diode (Laser Diode, LD) elements. Furthermore, the number of solid-state light-emitting elements is not limited to a plurality, and may be one. The electrical connection relationship of the plurality of solid-state light-emitting elements is a series connection, but is not limited to this connection relationship. The electrical connection relationship of the plurality of solid-state light-emitting elements may be a parallel connection, or a connection relationship that combines a series connection and a parallel connection.

[0024] The light source 3 emits illumination light by turning on the solid-state light emitting elements. The color of the illumination light is set appropriately depending on the installation location of the lighting fixture 1, the object to be illuminated, and the like.

[0025] In this embodiment, as shown in FIG. 1, the light source 3 includes a road light source 31 and a ceiling light source 32.

[0026] As shown in FIG. 1, the road light source 31 is composed of four light source modules 310. The four light source modules 310 are arranged in a grid pattern inside the housing 2 so as to face the front plate portion 21 of the housing 2. Inside the housing 2, a flat mounting plate 91 is fixed to the rear plate portion 22. The mounting plate 91 is rectangular with a notch 92 formed in the upper left corner. The four light source modules 310 are arranged in a grid pattern (2 x 2) on the front surface of the mounting plate 91 in an area to the right of the notch 92.

[0027] As shown in Fig. 2, the light source module 310 has a rectangular (square in Fig. 2) substrate 3b and a plurality of LED elements 3a mounted in a grid pattern (5 × 4 in Fig. 2) on the substrate 3b. The light source module 310 is attached to the front surface of the mounting plate 91 so that the LED elements 3a face the opening 2a (see Fig. 1).

[0028] As shown in Fig. 1, the ceiling light source 32 is composed of two light source modules 320. The two light source modules 320 are arranged side by side on the left and right inside the housing 2 so as to face the upper plate portion 25 of the housing 2. Inside the housing 2, a flat mounting plate 93 is fixed to the housing 2 so as to face the upper plate portion 25. The mounting plate 93 is rectangular. The two light source modules 320 are arranged side by side on the upper surface of the mounting plate 93.

[0029] As shown in Fig. 6, the light source module 320 has a rectangular substrate 3d (square in Fig. 6) and a plurality of LED elements 3c mounted on the substrate 3d in a grid pattern (5 × 4 in Fig. 2). The light source module 320 is attached to the upper surface of the mounting plate 93 so that the LED elements 3c face the opening 2b (see Fig. 1).

[0030] In this embodiment, the amount of illumination light emitted by the road light source 31 composed of four light source modules 310 is greater than the amount of illumination light emitted by the ceiling light source 32 composed of two light source modules 320.

[0031] (1.2.3) Optical components The optical member 4 is a lens.

[0032] In this embodiment, as shown in FIG. 1 , the optical member 4 includes a plurality of road lenses 41 and a plurality of ceiling lenses 42. The road lenses 41 correspond to the first optical member that emits the first light L1 of the present disclosure. The ceiling lenses 42 correspond to the second optical member that emits the second light L2 of the present disclosure. By dividing the optical members into the first optical member and the second optical member in this manner, it is possible to optimize the light distribution of the first light L1 and the second light L2 and suppress the occurrence of glare due to the first light L1 and the second light L2.

[0033] The housing 2 also includes an upper plate 25 and a lower plate 26 as a pair of plate portions facing each other in the vertical direction. The optical member 4 preferably emits the second light L2 in a direction along the inner wall surface T11 of the tunnel T1 from the upper plate 25, which is located above the upper plate 25 and the lower plate 26. In this case, the second light (L2) can be emitted from the upper plate 25 in a direction along the inner wall surface T11.

[0034] Furthermore, the optical member 4 preferably emits the second light L2 upward more than the first light L1, and the amount of light of the first light L1 is preferably greater than the amount of light of the second light L2. In this case, the first light L1 can be used as the main light for road illumination, and the second light L2 can be used as the auxiliary light for inspection.

[0035] (1.2.3.1) Road lenses As shown in FIG. 2, the multiple road lenses 41 are mounted on the substrate 3b so as to cover the multiple LED elements 3a included in the road light source 31, respectively. That is, the multiple road lenses 41 correspond one-to-one to the multiple LED elements 3a of the road light source 31. As shown in FIGS. 3 and 4, the road lens 41 has a flat dome shape that is long in the left-right direction (the opposing direction of the left plate portion 23 and the right plate portion 24), and a flat dome-shaped recess 41a is formed on the planar back surface that contacts the substrate 3b. The LED elements 3a mounted on the substrate 3b are housed in the recess 41a of the road lens 41 mounted on the substrate 3b. When the LED elements 3a in the recess 41a are lit, the illumination light emitted by the LED elements 3a enters the road lens 41. The illumination light emitted by the LED elements 3a passes through the road lens 41 and is emitted from the surface of the road lens 41 as a first light L1.

[0036] The shape of the surface of the road lens 41 is symmetrical in the longitudinal direction of the road lens 41, and asymmetrical in the lateral direction (direction perpendicular to the longitudinal direction) of the road lens 41. The shape of the recess 41a is also symmetrical in the longitudinal direction of the road lens 41, and asymmetrical in the lateral direction of the road lens 41. Figure 5 shows the X1-X1 cross section of the road lens 41 (see Figure 4), which is a cross section of the road lens 41 cut along the lateral direction.

[0037] The two ends facing each other in the short direction on the surface of the road lens 41 are defined as a first end P11 and a second end P12. In this case, the surface of the road lens 41 rises at a steep slope from the first end P11, reaches a peak P13 on the surface of the road lens 41, and then reaches the second end P12 at a gentle slope. That is, on the surface of the road lens 41, the slope on the first end P11 side is steeper than the slope on the second end P12 side.

[0038] The opposite ends of the recess 41a of the road lens 41 in the short-side direction are defined as a first end P21 and a second end P22. In the short-side direction, the first end P21 of the recess 41a is located on the same side as the first end P11 of the surface of the road lens 41, and the second end P22 of the recess 41a is located on the same side as the second end P12 of the surface of the road lens 41. In this case, the recess 41a rises at a gentle slope from the first end P21, reaches an apex P23 of the recess 41a, and then steeply slopes to the second end P22. That is, in the recess 41a, the slope on the first end P21 side is gentler than the slope on the second end P22 side.

[0039] Furthermore, the surface of the road lens 41 is smoother than the surface of the ceiling lens 42 (see FIG. 9) described below, and the vertex P13 of the road lens 41 is flatter than the vertex P33 (see FIG. 9) of the ceiling lens 42 described below. Furthermore, the inner surface of the recess 41a is angular compared to the inner surface of the recess 42a of the ceiling lens 42 (see FIG. 9) described below, and the vertex P23 of the recess 41a is sharper than the vertex P43 (see FIG. 9) of the recess 42a of the ceiling lens 42 described below.

[0040] Within the housing 2, the longitudinal direction of the road lens 41 coincides with the opposing direction of the left plate portion 23 and the right plate portion 24, and the lateral direction of the road lens 41 coincides with the opposing direction of the upper plate portion 25 and the lower plate portion 26.

[0041] As shown in FIG. 10, when the housing 2 is installed on the inner wall surface T11 of the tunnel T1, the first end P11 of the road lens 41 is located above the second end P12, and the first end P21 of the recess 41a is located above the second end P22. The illumination light emitted by the LED element 3a in the recess 41a is emitted from the surface of the road lens 41 as the first light L1 shown in FIG. 11. As a result, when the housing 2 is installed on the inner wall surface T11 so that the opening 2a of the housing 2 faces diagonally downward as shown in FIG. 10, the first light L1 emitted from the surface of the road lens 41 is irradiated mainly toward the road R1 (see FIG. 10) through the opening 2a of the housing 2 (see FIG. 1). The first light L1, irradiated toward the road R1, brightens the field of view of the driver of the vehicle C1 traveling on the road R1, thereby improving the safety of the vehicle C1 during travel.

[0042] (1.2.3.2) Ceiling Lens As shown in FIG. 6, the ceiling lenses 42 are mounted on the substrate 3d so as to cover the LED elements 3c of the ceiling light source 32, respectively. That is, the ceiling lenses 42 correspond one-to-one to the LED elements 3c of the ceiling light source 32. As shown in FIGS. 7 and 8, the ceiling lens 42 has a flat dome shape that is long in the left-right direction, and a flat dome-shaped recess 42a is formed on the planar back surface that contacts the substrate 3d. The LED elements 3c mounted on the substrate 3d are accommodated in the recess 42a of the ceiling lens 42 mounted on the substrate 3d. When the LED elements 3c in the recess 42a are lit, the illumination light emitted by the LED elements 3c enters the ceiling lens 42. The illumination light emitted by the LED elements 3c passes through the ceiling lens 42 and is emitted as second light L2 from the surface of the ceiling lens 42.

[0043] The shape of the surface of the ceiling lens 42 is symmetrical in the longitudinal direction of the ceiling lens 42, and asymmetrical in the lateral direction (direction perpendicular to the longitudinal direction) of the ceiling lens 42. The shape of the recess 42a is also symmetrical in the longitudinal direction of the ceiling lens 42, and asymmetrical in the lateral direction of the ceiling lens 42. Figure 9 shows the X2-X2 cross section of the ceiling lens 42 (see Figure 8), which is a cross section of the ceiling lens 42 cut along the lateral direction.

[0044] The opposite ends of the surface of the ceiling lens 42 in the short direction are defined as a first end P31 and a second end P32. In this case, the surface of the ceiling lens 42 rises at a steep slope from the first end P31, reaches a peak P33 of the surface of the ceiling lens 42, and then slopes more gently to the second end P32. That is, on the surface of the ceiling lens 42, the slope on the first end P31 side is steeper than the slope on the second end P32 side.

[0045] The opposite ends of the recess 42a of the ceiling lens 42 in the short-side direction are defined as a first end P41 and a second end P42. In the short-side direction, the first end P41 of the recess 42a is located on the same side as the first end P31 of the surface of the ceiling lens 42, and the second end P42 of the recess 42a is located on the same side as the second end P32 of the surface of the ceiling lens 42. In this case, the recess 42a rises at a gentle slope from the first end P41, reaches an apex P43 of the recess 42a, and then steeply slopes to the second end P42. That is, the slope of the recess 42a on the first end P41 side is gentler than the slope on the second end P42 side.

[0046] Furthermore, the surface of the ceiling lens 42 is angular compared to the surface of the road lens 41 (see FIG. 5), and the apex P33 of the ceiling lens 42 is sharper than the apex P13 (see FIG. 5) of the road lens 41. Furthermore, the inner surface of the recess 42a is smoother than the inner surface of the recess 41a of the road lens 41 (see FIG. 5), and the apex P43 of the recess 42a is flatter than the apex P23 (see FIG. 5) of the recess 41a of the road lens 41.

[0047] Within the housing 2, the longitudinal direction of the ceiling lens 42 coincides with the opposing direction of the left plate portion 23 and the right plate portion 24, and the lateral direction of the ceiling lens 42 coincides with the opposing direction of the front plate portion 21 and the rear plate portion 22.

[0048] As shown in FIG. 10, when the housing 2 is installed on the inner wall surface T11 of the tunnel T1, the first end P31 of the surface of the ceiling lens 42 is located closer to the rear plate 22 than the second end P32, and the second end P32 is located closer to the front plate 21 than the first end P31. The illumination light emitted by the LED elements 3c in the recesses 42a is emitted from the surface of the ceiling lens 42 as second light L2 shown in FIG. 12. Specifically, the ceiling lens 42 has a light distribution characteristic that distributes more light backward than forward, and the second light L2 mainly travels backward. As a result, the second light L2 emitted from the surface of the ceiling lens 42 passes through the opening 2b of the housing 2 (see FIG. 1) and is irradiated mainly along the inner wall surface T11 of the tunnel T1 (see FIG. 10) and onto an upper portion of the inner wall surface T11. Specifically, the optical axis of the second light L2 extends in a direction along the chord of the arc-shaped inner wall surface T11, and the second light L2 is irradiated onto an upper portion of the inner wall surface T11 along the inner wall surface T11 from the opening 2b in the upper plate portion 25 of the housing 2. The second light L2 irradiated along the inner wall surface T11 illuminates the upper portion of the inner wall surface T11, ensuring the brightness of the inner wall surface T11.

[0049] In this way, the second light L2 travels from the opening 2b in the upper plate portion 25 of the housing 2 along the inner wall surface T11 of the tunnel T1 and is irradiated onto an upper portion of the inner wall surface T11. That is, the ceiling lens 42 emits the second light L2 in a direction along the inner wall surface T11 of the tunnel T1 from the upper plate portion 25. As a result, within the irradiation range of the second light L2, defects on the inner wall surface T11, such as unevenness, scratches, and peeling, are highlighted by the second light L2, making it easier to optically or visually grasp the condition of the inner wall surface T11 (such as the presence or absence of defects).

[0050] (1.2.3.3) Light distribution Fig. 10 shows the light distribution of first light L1 and second light L2 emitted by a lighting fixture 1 installed in tunnel T1. Fig. 10 shows two lighting fixtures 1 installed on both sides of an inner wall surface T11 facing each other across a road R1 on which a vehicle C1 is traveling. Each of the two lighting fixtures 1 emits the first light L1 onto the road R1 and the second light L2 onto the inner wall surface T11.

[0051] Specifically, the optical member 4 of the lighting fixture 1 emits the second light L2 upward more than the first light L1. The first light L1 is generated by a road light source 31 composed of four light source modules 310. The second light L2 is generated by a ceiling light source 32 composed of two light source modules 320. Therefore, the amount of the first light L1 emitted from the lighting fixture 1 is greater than the amount of the second light L2 emitted from the lighting fixture 1.

[0052] In this way, the lighting fixture 1 primarily functions as a road light that illuminates the road R1 in the tunnel T1, and also functions as a ceiling light that is used for inspection purposes.

[0053] (1.2.4) Imaging unit The imaging unit 5 has a lens and multiple imaging elements. The imaging elements are image sensors such as CCDs (Charged Coupled Devices) or CMOSs ​​(Complementary Metal Oxide Semiconductors), which receive light collected by the lens and convert the image formed on the light-receiving surface into an electrical signal. The imaging unit 5 generates captured image data based on the electrical signals output from the multiple imaging elements. The captured image is a color or monochrome still image or video. The imaging unit 5 outputs the captured image data to the circuit block 6.

[0054] As shown in FIG. 1, the imaging unit 5 is disposed in a notch 92 of a mounting plate 91 inside the housing 2. The optical axis (imaging direction) of the imaging unit 5 passes through the opening 2b of the housing 2 and points toward the inner wall surface T11 of the tunnel T1. In other words, the optical axis of the imaging unit 5 extends in a direction along the chord of the arc-shaped inner wall surface T11 through the opening 2b. The imaging range of the imaging unit 5 is at least a part of the irradiation range of the second light L2, and the imaging unit 5 captures an image of the inner wall surface T11 that is irradiated with the second light L2.

[0055] As described above, the imaging unit 5 images the irradiation range of the second light L2 emitted from the opening 2b in a direction along the chord of the inner wall surface T11, and therefore, image data can be created in which defects such as unevenness, scratches, and peeling on the inner wall surface T11 are emphasized by the second light L2.

[0056] (1.2.5) Circuit Block The circuit block 6 preferably includes a computer system. That is, in the circuit block 6, a processor such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit) reads and executes a program stored in memory, thereby realizing some or all of the functions of the circuit block 6. The circuit block 6 mainly includes a processor that operates according to a program. The type of processor is not important as long as it can realize functions by executing a program. The processor is composed of one or more electronic circuits, including a semiconductor integrated circuit (IC) or an LSI (Large Scale Integration). Although the terms IC and LSI are used here, the names may vary depending on the degree of integration, and may be called system LSI, VLSI (Very Large Scale Integration), or ULSI (Ultra Large Scale Integration). Field programmable gate arrays (FPGAs), which are programmable after the LSI is manufactured, or reconfigurable logic devices that can reconfigure the connections within the LSI or set up circuit partitions within the LSI, can also be used for the same purpose. Multiple electronic circuits may be integrated on a single chip or on multiple chips. The plurality of chips may be arranged in a concentrated manner or in a dispersed manner.

[0057] 1, the circuit block 6 is attached to the mounting plate 91 below the notch 92. As shown in FIG. 13, the circuit block 6 includes a control unit 6a, a timer circuit 6b, a communication unit 6c, a memory unit 6d, and an inspection unit 6e.

[0058] (1.2.5.1) Light source drive and light source control The control unit 6a has a light source driving function of supplying a driving current to the light sources 3 (the road light sources 31 and the ceiling light sources 32) and a light source control function of switching on and off the supply of the driving current. Specifically, the control unit 6a supplies a driving current to the road light sources 31 and the ceiling light sources 32. Furthermore, the control unit 6a switches on and off the supply of the driving current supplied to the road light sources 31, and switches on and off the supply of the driving current supplied to the ceiling light sources 32. In other words, the control unit 6a turns on and off the irradiation of the first light L1 by switching on and off the road light sources 31. Furthermore, the control unit 6a turns on and off the irradiation of the second light L2 by switching on and off the ceiling light sources 32.

[0059] It is preferable that the control unit 6a simultaneously emits the first light L1 and the second light L2. That is, it is preferable that the first light L1 and the second light L2 are simultaneously emitted. Specifically, the control unit 6a keeps the road light source 31 always on and also keeps the ceiling light source 32 always on. As a result, the lighting device 1 can continue to illuminate the road even during inspection, and visibility inside the tunnel T1 can be maintained even during inspection. Furthermore, even if some of the road light sources 31 and ceiling light sources 32 are turned off, it is possible to illuminate the inside of the tunnel T1 as much as possible, thereby suppressing a decrease in visibility inside the tunnel T1.

[0060] (1.2.5.2) Imaging control The control unit 6a has an imaging control function that controls the operation of the imaging unit 5. Furthermore, the timer circuit 6b has a clocking function that keeps track of the current time. Specifically, the control unit 6a includes time data indicating the time at which the captured image was captured in the data of the captured image generated by the imaging unit 5, based on the time kept by the timer circuit 6b. As a result, the lighting device 1 can associate the captured image with the time at which it was captured.

[0061] Furthermore, the control unit 6a may control the imaging timing of the imaging unit 5 based on the timing result of the timer circuit 6b. That is, the imaging unit 5 captures images at timing based on the timing result of the timer circuit 6b. For example, the control unit 6a schedules and controls the imaging timing of the imaging unit 5 so that the inner wall surface T11 is captured a predetermined number of times (at least once) at a predetermined time on a predetermined day. Furthermore, the control unit 6a may periodically set the imaging timing so that the imaging unit 5 periodically captures images of the inner wall surface T11. In this way, the imaging unit 5 captures images at timing based on the timing result of the timer circuit 6b, thereby enabling flexible setting of the imaging timing.

[0062] (1.2.5.3) Inspection The inspection unit 6e is provided in the housing 2 and inspects the inner wall surface T11 based on the captured image of the inner wall surface T11 captured by the imaging unit 5. The inspection unit 6e performs image recognition processing on the captured image of the inner wall surface T11 to determine the occurrence of defects such as unevenness, scratches, and peeling on the inner wall surface T11.

[0063] In this embodiment, the inspection unit 6e preferably includes a learning model created by machine learning such as deep learning that uses a large number of captured images as training data. For example, the learning model is constructed by deep learning using FCN (Fully Convolutional Networks). The learning model receives input of captured image data and outputs a determination result of the occurrence of a defect on the inner wall surface T11.

[0064] The algorithm executed by the inspection unit 6e is not limited to a specific algorithm, and the learning model may be a model using other algorithms such as multiple regression analysis and support vector machines.

[0065] The inspection unit 6e may be configured to perform an inspection every time the imaging unit 5 creates an image, to perform an inspection periodically, or to perform an inspection when the communication unit 6c described below receives an inspection request from the external device E1, or when a specific event occurs.

[0066] Furthermore, the inspection unit 6e may determine the change over time in the state of the inner wall surface T11 based on a plurality of captured images captured in chronological order. In this case, the inspection unit 6e can predict the occurrence of a defect in the inner wall surface T11, thereby making it possible to prevent the occurrence of a defect in the inner wall surface T11.

[0067] The data of the inspection result of the inspection unit 6e is stored in the storage unit 6d. The storage unit 6d is preferably a rewritable nonvolatile memory such as an EEPROM (Electrically Erasable Programmable Read Only Memory) or a flash memory, but is not limited to a specific recording medium.

[0068] (1.2.5.4) Communication As shown in Fig. 13, the lighting fixture 1 preferably further includes a communication unit 6c that communicates with an external device E1. The external device E1 is a server device or the like installed at a location away from the tunnel T1, and is managed by an organization (inspection organization) that inspects the tunnel T1. The inspection organization performs work related to the inspection of the inner wall surface T11. The inspection organization may be either a private organization or a public organization.

[0069] For example, the external device E1 transmits an imaging request to the lighting fixture 1 at a predetermined timing. The imaging request is a signal (command) requesting the lighting fixture 1 to capture an image of the inner wall surface T11 using the imaging unit 5. When the communication unit 6c receives the imaging request, the control unit 6a causes the imaging unit 5 to capture an image of the inner wall surface T11. In other words, when the communication unit 6c receives the imaging request, the imaging unit 5 performs an imaging operation. Therefore, the imaging timing of the imaging unit 5 in the lighting fixture 1 can be set by remote control.

[0070] Furthermore, the control unit 6a of the lighting fixture 1 may transmit the inspection results of the inspection unit 6e to the external device E1 via the communication unit 6c. The timing of transmission of the inspection results by the communication unit 6c may be any of the following: every time an inspection is completed, periodically, or when the communication unit 6c receives a result transmission request from the external device E1. The control unit 6a can collectively transmit multiple inspection results for a predetermined period of time via the communication unit 6c to the external device E1 by reading the inspection results stored in the memory unit 6d.

[0071] Furthermore, the communication unit 6c may transmit a repair request for repairing the inner wall surface T11 to the external device E1 based on the inspection results of the inspection unit 6e. Specifically, if a defect in the inner wall surface T11 is found, the communication unit 6c transmits the repair request together with the inspection results to the external device E1. The external device E1 visually and audibly notifies an inspector working at the inspection agency that repair is required, along with the inspection results. The inspector then takes action to repair and maintain the inner wall surface T11 of the tunnel T1 based on the presented inspection results. In other words, the lighting fixture 1 can quickly request action to repair and maintain the inner wall surface T11.

[0072] Preferably, the communication unit 6c receives weather information for the area where the tunnel T1 is located, and the imaging frequency of the imaging unit 5 is set based on the weather information. In this case, the communication unit 6c acquires weather information from a weather server or the like via a communication path including the Internet. The weather information includes information such as a weather forecast for the area where the tunnel T1 is located and current weather. The control unit 6a then sets the imaging timing of the imaging unit 5 based on the weather information. For example, if a storm, strong winds, snowfall, or a typhoon occurs or is predicted, the control unit 6a increases the imaging frequency of the imaging unit 5 and the inspection frequency, assuming that such an event could have adverse effects such as accelerating deterioration, such as cracks, on the inner wall surface T11 of the tunnel T1. The communication unit 6c may also receive disaster information for the area where the tunnel T1 is located, and the imaging frequency of the imaging unit 5 may be set based on the disaster information. The disaster information includes information about earthquakes, fires, traffic accidents, and the like. Therefore, the lighting fixture 1 can improve inspection accuracy during bad weather and disasters.

[0073] The wireless communication performed by the communication unit 6c is preferably wireless communication via a mobile phone network (communication conforming to any of standards such as 5G (5th Generation), 4G (4th Generation), and LTE (Long Term Evolution)). Alternatively, the communication unit 6c may perform wireless communication conforming to standards such as Bluetooth (registered trademark), Bluetooth low energy, Wi-Fi (registered trademark), ZigBee (registered trademark), or unlicensed low-power wireless (specified low-power wireless). The wired communication performed by the communication unit 6c may be wired communication via, for example, a twisted pair cable, a dedicated communication line, or a LAN (Local Area Network) cable.

[0074] (1.2.6) Advantages The lighting fixture 1 described above primarily functions as a road light that illuminates the road R1 of the tunnel T1, but also functions as a ceiling light for inspection purposes. The lighting fixture 1 also includes an imaging unit 5, which has an integrated imaging function for capturing an image of the inner wall surface T11 illuminated with the second light L2.

[0075] Therefore, by installing the lighting fixture 1 inside the tunnel T1, it is possible to image the inner wall surface T11 of the tunnel T1 while irradiating the inner wall surface T11 with the second light L2. As a result, there is no need to use a work vehicle, and it is possible to image the inner wall surface T11 even during the daytime when traffic is heavy. Furthermore, there is no need to secure a work vehicle and a worker to improve inspection accuracy. In other words, by installing the lighting fixture 1 inside the tunnel T1, it is possible to free yourself from the various constraints that arise when using a work vehicle to image the inner wall surface of a tunnel for inspection. As a result, the lighting fixture 1 can easily image the inner wall surface T11 of the tunnel T1.

[0076] Furthermore, the lighting fixture 1 is provided with an integrated inspection unit 6e. Therefore, the lighting fixture 1 can perform lighting, imaging, and inspection independently. In other words, simply installing the lighting fixture 1 in the tunnel T1 enables lighting of the tunnel T1 and imaging and inspection of the inner wall surface T11, improving usability in operating the tunnel T1.

[0077] (2) First Modification FIG. 14 shows a lighting fixture 1A of a first modified example.

[0078] The lighting fixture 1A includes a housing 2A, a light source 3A, an optical member 4A, and an imaging unit 5. The lighting fixture 1A also includes a circuit block 6. Note that components similar to those of the lighting fixture 1 of the above-described embodiment are denoted by the same reference numerals and will not be described again.

[0079] Housing 2A is a hollow rectangular box having rectangular front plate 21, rear plate 22, left plate 23, right plate 24, upper plate 25A, and lower plate 26. Upper plate 25A does not have opening 2b that upper plate 25 of lighting fixture 1 has, and is a rectangular plate.

[0080] In the first modification, the light source 3A includes a road light source 31A and a ceiling light source 32A.

[0081] The road light source 31A is composed of two light source modules 310 (see FIG. 2). The two light source modules 310 are arranged side by side on the left and right at the top of the front surface of the mounting plate 91 so as to face the opening 2a. The ceiling light source 32A is composed of two light source modules 320 (see FIG. 6). The two light source modules 320 are arranged side by side on the left and right at the bottom of the front surface of the mounting plate 91 so as to face the opening 2a. In other words, on the front surface of the mounting plate 91, the road light source 31A is located at the top and the ceiling light source 32A is located at the bottom.

[0082] The optical member 4A includes a plurality of road lenses 41 and a plurality of ceiling lenses 42. The plurality of road lenses 41 are mounted on the substrate 3b of the light source module 310 so as to cover the plurality of LED elements 3a included in the road light source 31A, respectively (see FIG. 2). The road lenses 41 correspond to the first optical member that emits the first light L1 of the present disclosure. The plurality of ceiling lenses 42 are mounted on the substrate 3d of the light source module 320 so as to cover the plurality of LED elements 3c included in the ceiling light source 32A, respectively (see FIG. 6). The ceiling lenses 42 correspond to the second optical member that emits the second light L2 of the present disclosure. In the first modified example, the ceiling lenses 42 (second optical member) are positioned lower than the road lenses 41 (first optical member). As a result, it becomes easier to irradiate the second light L2 above the housing 2A, and the inspection range can be expanded.

[0083] Moreover, the optical member 4A emits the second light L2 in a direction higher than the first light L1, and it is preferable that the amount of the first light L1 is greater than the amount of the second light L2.

[0084] Within the housing 2A, the longitudinal direction of the road lens 41 provided in the road light source 31A coincides with the opposing direction of the left plate portion 23 and the right plate portion 24, and the lateral direction of the road lens 41 coincides with the opposing direction of the upper plate portion 25 and the lower plate portion 26. When the housing 2A is installed on the inner wall surface T11 of the tunnel T1 as shown in FIG. 15, the opening 2a of the housing 2 faces diagonally downward, and the first light L1 mainly travels diagonally downward. As a result, the first light L1 emitted from the surface of the road lens 41 is irradiated mainly toward the road R1 (see FIG. 15) through the opening 2a of the housing 2A (see FIG. 14). By irradiating the first light L1 toward the road R1, the field of view of the driver of the vehicle C1 traveling on the road R1 is brightened, thereby improving the safety of the vehicle C1 while traveling.

[0085] Within the housing 2A, the longitudinal direction of the ceiling lens 42 coincides with the opposing direction of the left plate 23 and the right plate 24, and the lateral direction of the ceiling lens 42 coincides with the opposing direction of the upper plate 25 and the lower plate 26. When the housing 2A is installed on the inner wall surface T11 of the tunnel T1 as shown in Figure 15, the ceiling lens 42 has a light distribution characteristic that distributes more light upward than downward, and the second light L2 travels mainly upward. As a result, the second light L2 emitted from the surface of the ceiling lens 42 is irradiated mainly onto the upper part of the inner wall surface T11 of the tunnel T1 (see Figure 15) through the opening 2a of the housing 2A (see Figure 14). Specifically, the optical axis of the second light L2 emitted from the lighting fixture 1A installed on the inner wall surface T11 extends toward the upper part of the inner wall surface T11 facing the road R1, and the second light L2 is irradiated onto the upper part of the inner wall surface T11 facing the road R1 through the opening 2a (see FIG. 14) of the housing 2A. The second light L2 illuminates the upper part of the inner wall surface T11, ensuring the brightness of the inner wall surface T11.

[0086] 14, the imaging unit 5 is disposed in a notch 92 of a mounting plate 91 inside the housing 2. The optical axis (imaging direction) of the imaging unit 5 is directed toward the inner wall surface T11 of the tunnel T1 through the opening 2a of the housing 2. The imaging range of the imaging unit 5 is at least a part of the irradiation range of the second light L2, and the imaging unit 5 captures an image of the inner wall surface T11 that is irradiated with the second light L2.

[0087] The lighting fixture 1A having the above-described configuration can easily capture an image of the inner wall surface T11 of the tunnel T1.

[0088] (3) Second Modification FIG. 16 shows a lighting fixture 1B according to a second modification.

[0089] Lighting device 1B includes a housing 2A, a light source 3B, an optical member 4B, and an imaging unit 5. Lighting device 1 also includes a circuit block 6B. Note that components similar to those in lighting device 1A of the first modified example described above are denoted by the same reference numerals and will not be described again.

[0090] In the second variant, the light source 3B comprises a common light source 33.

[0091] 16, the common light source 33 is composed of four light source modules 330. The four light source modules 330 are arranged in a lattice pattern inside the housing 2A so as to face the front plate portion 21 of the housing 2A. The four light source modules 330 are arranged in a lattice pattern (2×2) on the front surface of the mounting plate 91 in an area to the right of the cutout 92.

[0092] 17, the light source module 330 has a rectangular (square in FIG. 17) substrate 3f and a plurality of LED elements 3e mounted on the substrate 3f in a grid pattern (5×4 in FIG. 17). The light source module 330 is attached to the front surface of the mounting plate 91 so that the LED elements 3e face the opening 2a (see FIG. 16).

[0093] The optical member 4B is a lens.

[0094] 16, in the second modified example, the optical member 4B includes a plurality of common lenses 43. The common lenses 43 emit both the first light L1 and the second light L2. Furthermore, the optical member 4B emits the second light L2 in a direction above the first light L1, and it is preferable that the amount of the first light L1 is greater than the amount of the second light L2.

[0095] As shown in FIG. 17, the common lenses 43 are mounted on the substrate 3f so as to cover the LED elements 3e of the common light source 33, respectively. That is, the common lenses 43 correspond one-to-one to the LED elements 3e of the common light source 33. As shown in FIGS. 18 and 19, the common lens 43 has a flat dome shape that is long in the left-right direction (the direction in which the left plate portion 23 and the right plate portion 24 face each other), and a flat dome-shaped recess 43a is formed on the planar back surface that contacts the substrate 3f. The LED elements 3e mounted on the substrate 3f are accommodated in the recess 43a of the common lens 43 mounted on the substrate 3f. When the LED elements 3e in the recess 43a are lit, illumination light emitted by the LED elements 3e enters the common lens 43. The illumination light emitted by the LED elements 3e passes through the common lens 43 and is emitted from the surface of the common lens 43 as first light L1 and second light L2.

[0096] The shape of the surface of the common lens 43 is symmetrical in the longitudinal direction of the common lens 43, and asymmetrical in the lateral direction (direction perpendicular to the longitudinal direction) of the common lens 43. The shape of the recess 43a is also symmetrical in the longitudinal direction of the common lens 43, and asymmetrical in the lateral direction of the common lens 43. Figure 20 shows the X3-X3 cross section of the common lens 43 (see Figure 19), which is a cross section of the common lens 43 cut along the lateral direction.

[0097] The two ends of the surface of the common lens 43 that face each other in the short direction are defined as a first end P51 and a second end P52. In this case, the surface of the common lens 43 rises at a gentle slope from the first end P51, reaches a peak P53 of the surface of the common lens 43, and then steeply slopes to the second end P52. That is, on the surface of the common lens 43, the slope on the first end P51 side is gentler than the slope on the second end P52 side.

[0098] The opposite ends of the recess 43a of the common lens 43 in the short-side direction are defined as a first end P61 and a second end P62. In the short-side direction, the first end P61 of the recess 43a is located on the same side as the first end P51 of the surface of the common lens 43, and the second end P62 of the recess 43a is located on the same side as the second end P52 of the surface of the common lens 43. In this case, the recess 43a rises at a gentle slope from the first end P61, reaches an apex P63 of the recess 43a, and then steeply slopes to the second end P62. That is, the slope of the recess 43a on the first end P61 side is gentler than the slope on the second end P62 side.

[0099] Furthermore, the surface of the common lens 43 is smoother than the surface of the ceiling lens 42 (see FIG. 9), and the vertex P53 of the common lens 43 is flatter than the vertex P33 (see FIG. 9) of the ceiling lens 42. Furthermore, the inner surface of the recess 43a is smoother than the inner surface of the recess 41a of the road lens 41 (see FIG. 5), and the vertex P63 of the recess 43a is flatter than the vertex P23 of the recess 41a of the road lens 41 (see FIG. 5).

[0100] Within the housing 2A, the longitudinal direction of the common lens 43 coincides with the opposing direction of the left and right plate portions 23 and 24, and the lateral direction of the common lens 43 coincides with the opposing direction of the upper and lower plate portions 25 and 26.

[0101] As shown in Fig. 21, when the housing 2A is installed on the inner wall surface T11 of the tunnel T1, the first end P51 of the surface of the common lens 43 is located higher than the second end P52, and the first end P61 of the recess 43a is located higher than the second end P62. The illumination light emitted by the LED element 3e in the recess 43a passes through the common lens 43 and is emitted from the surface of the common lens 43 as first light L1 and second light L2 shown in Fig. 22. The first light L1 is emitted from the lower part of the surface of the common lens 43 and travels downward. The second light L2 is emitted from the upper part of the surface of the common lens 43 and travels upward.

[0102] As a result, the first light L1 is irradiated mainly toward the road R1 (see FIG. 21) through the opening 2a (see FIG. 16) of the housing 2A. By irradiating the first light L1 toward the road R1, the field of view of the driver of the vehicle C1 traveling on the road R1 is brightened, thereby improving the safety of the vehicle C1 while traveling.

[0103] The second light L2 is irradiated mainly onto an upper portion of the inner wall surface T11 (see FIG. 21) of the tunnel T1 through the opening 2a of the housing 2A (see FIG. 16). Specifically, the optical axis of the second light L2 irradiated from the lighting fixture 1B installed on the inner wall surface T11 extends toward an upper portion of the inner wall surface T11 facing the opposite side of the road R1, and the second light L2 is irradiated onto an upper portion of the inner wall surface T11 facing the opposite side of the road R1 through the opening 2a of the housing 2A (see FIG. 16). The second light L2 illuminates the upper portion of the inner wall surface T11, ensuring brightness of the inner wall surface T11.

[0104] The lighting device 1B having the above-described configuration can easily capture an image of the inner wall surface T11 of the tunnel T1.

[0105] As shown in FIG. 23, in the circuit block 6B, the control unit 6a switches the common light source 33 on and off, thereby synchronously turning on and off the irradiation of the first light L1 and the second light L2.

[0106] (4) Third Modification In the third modified example, as shown in Fig. 24, lighting device 1C and external device E2 constitute lighting system A2. In lighting system A2, lighting device 1C includes circuit block 6C. Circuit block 6C does not include inspection unit 6e, and external device E2 includes inspection unit 7. Note that components similar to those in the above-described embodiment, first modified example, and second modified example are designated by the same reference numerals and will not be described again.

[0107] In lighting fixture 1C, memory unit 6d stores address information for transmitting image data of inner wall surface T11 captured by imaging unit 5 to external device E2. Communication unit 6c reads the address information of external device E2 from memory unit 6d and transmits the image data to external device E2 using the address information of external device E2. That is, control unit 6a causes communication unit 6c to transmit image data of inner wall surface T11 captured by imaging unit 5 to external device E2.

[0108] In the external device E2, the inspection unit 7 has an inspection function similar to that of the inspection unit 6e, and inspects the inner wall surface T11 based on a captured image of the inner wall surface T11. The inspection unit 7 performs image recognition processing on the captured image of the inner wall surface T11 to determine the occurrence of defects such as unevenness, scratches, and peeling on the inner wall surface T11.

[0109] The external device E2 visually and audibly presents the inspection results to an inspector working at the inspection agency, who then takes action to repair and maintain the inner wall surface T11 of the tunnel T1 based on the presented inspection results.

[0110] Alternatively, external device E2 may transmit inspection result data to lighting fixture 1C. In lighting fixture 1C, communication unit 6c receives the inspection result data from lighting fixture 1C. That is, communication unit 6c receives inspection result data of inner wall surface T11 based on the captured images from external device E2. Controller 6a sets the imaging timing of imaging unit 5 based on the inspection results. For example, if controller 6a finds a defect in inner wall surface T11, it increases the imaging frequency of imaging unit 5 and therefore the frequency of inspection.

[0111] In one embodiment, an information collection center or the like may remotely monitor the site inside tunnel T1. In this case, it is preferable that the inspection unit 7 can remotely control (wide (wide), narrow (narrow), etc.) the imaging range (angle of view) of the imaging unit 5 according to the monitoring results of the information collection center or the content of the remote control by the information collection center or the like. Furthermore, if the imaging unit 5 is configured to be capable of pan (horizontal, left and right), tilt (vertical, up and down), and roll (rotation) movements, it is preferable that the inspection unit 7 can adjust the imaging direction by controlling the pan, tilt, and roll movements of the imaging unit 5.

[0112] Furthermore, lighting device 1C is preferably configured to be able to adjust the irradiation range and irradiation direction of second light L2 in conjunction with the imaging range and imaging direction of imaging unit 5. In this case, lighting device 1C is equipped with a drive system or a variable optical system for adjusting the irradiation range and irradiation direction of second light L2.

[0113] (5) Fourth Modification 25 and 26 show a lighting device 1D according to a fourth modification.

[0114] The lighting device 1D includes a housing 2D (see FIG. 25) in the shape of a long rectangular box. The housing 2D contains a light source 3D, an optical element 4D, an imaging unit 5, and a circuit block 6D (see FIG. 26). The optical element 4D is a reflector. Note that the imaging unit 5 is not shown in FIG. 26.

[0115] The light source 3D includes a plurality of LED elements 3g and a substrate 3h. The substrate 3h has a long plate shape and is housed in the housing 2D. The plurality of LED elements 3g are mounted on the substrate 3h in a lattice pattern.

[0116] The optical member 4D includes a road reflector 44 and a ceiling reflector 45. The road reflector 44 is disposed above the light source 3D and has an elongated shape extending along the longitudinal direction of the light source 3D. The road reflector 44 reflects the illumination light emitted by the light source 3D downward, and emits a first light L1. In other words, the road reflector 44 corresponds to a first optical member that emits the first light L1. The ceiling reflector 45 is disposed below the light source 3D and has an elongated shape extending along the longitudinal direction of the light source 3D. The ceiling reflector 45 reflects the illumination light emitted by the light source 3D upward, and emits a second light L2. In other words, the ceiling reflector 45 corresponds to a second optical member that emits the second light L2.

[0117] (6) Fifth Modification The lighting fixtures 1, 1A, 1B, 1C, and 1D are preferably configured to be able to adjust the optical axes (emission directions) of the first light L1 and the second light L2. For example, the lighting fixtures 1, 1A, 1B, 1C, and 1D are each equipped with an optical axis adjustment unit configured to adjust the installation angles of the light source modules 310, 320, and 330 and the light source 3D. In this case, the emission directions of the first light L1 and the second light L2 can be adjusted to match the actual structure of the tunnel T1. Furthermore, a normally operating light source module 310, 320, or 330 can be used in place of a faulty light source module 310, 320, or 330. For example, if a light source module 320 fails, the installation angle of one of the multiple light source modules 310 can be adjusted to use that light source module 310 in place of the faulty light source module 320.

[0118] The imaging unit 5 is preferably configured to be able to adjust the imaging direction. For example, in order to capture an image of the entire area of ​​the irradiation range W2 of the second light L2, the imaging unit 5 captures the entire area of ​​the irradiation range W2 while changing the imaging direction. In this case, the inspection units 6e and 7 can inspect a wider area of ​​the inner wall surface T11.

[0119] The imaging unit 5 may be provided outside the housing 2, 2A, or 2D as a separate body from the housing 2, 2A, or 2D.

[0120] The circuit blocks 6, 6B, 6C, and 6D may be implemented using a single computer device or multiple computers linked together, and may also be implemented using a cloud computing system.

[0121] Multiple lighting fixtures 1, 1A, 1B, 1C, and 1D are installed in a row along road R1 inside tunnel T1, but the number of lighting fixtures 1, 1A, 1B, 1C, and 1D installed in tunnel T1 may be one or more.

[0122] The configurations of the above-described embodiment and modified examples can be combined as appropriate.

[0123] (7) Summary The lighting system (A1, A2) of the first aspect according to the above-described embodiment includes a housing (2, 2A, 2D), light sources (3, 3A, 3B, 3D), optical members (4, 4A, 4B, 4D), and an imaging unit (5). The housing (2, 2A, 2D) is installed on an inner wall surface (T11) of a tunnel (T1) formed along a road (R1). The light sources (3, 3A, 3B, 3D) are provided in the housing (2, 2A, 2D) and emit illumination light. The optical members (4, 4A, 4B, 4D) are provided in the housing (2, 2A, 2D) and receive the illumination light. The imaging unit (5) is provided in the housing (2, 2A, 2D). The optical members (4, 4A, 4B, 4D) emit a first light (L1) toward the road (R1) and a second light (L2) toward the inner wall surface (T11). The imaging unit (5) captures an image of at least a part of an irradiation range (W2) of the second light (L2) on the inner wall surface (T11).

[0124] The above-mentioned lighting systems (A1, A2) can easily capture images of the inner wall surface (T11) of the tunnel (T1).

[0125] In the lighting system (A1, A2) of the second aspect of the embodiment, in the first aspect, the optical members (4, 4A, 4B, 4D) preferably include at least a first optical member (41, 44) that emits a first light (L1) and a second optical member (42, 45) that emits a second light (L2).

[0126] The above-mentioned lighting systems (A1, A2) divide the optical members (4, 4A, 4B, 4D) into a first optical member (41, 44) for illuminating the road (R1) and a second optical member (42, 45) for illuminating the inner wall surface (T11). As a result, the lighting systems (A1, A2) can suppress the occurrence of glare.

[0127] In the illumination system (A1, A2) of the third aspect according to the embodiment, in the second aspect, the second optical member (42, 45) is preferably located below the first optical member (41, 44).

[0128] The above-described lighting system (A1, A2) makes it easier to irradiate the second light (L2) above the housing (2, 2A, 2D), and can expand the inspection range.

[0129] In the lighting system (A1, A2) of a fourth aspect according to the embodiment, in any one of the first to third aspects, the housing (2) includes a pair of plate portions (25, 26) facing each other in the vertical direction. It is preferable that the optical member (4) emits the second light (L2) from the upper plate portion (25) located above the pair of plate portions (25, 26) in a direction along the inner wall surface (T11).

[0130] The above-described lighting systems (A1, A2) can emit the second light (L2) from the upper plate portion (25) in a direction along the inner wall surface (T11). As a result, within the irradiation range of the second light (L2), defects on the inner wall surface (T11), such as irregularities, scratches, and peeling, are highlighted by the second light (L2), making it easier to optically or visually grasp the condition of the inner wall surface (T11) (such as the presence or absence of defects).

[0131] In the illumination system (A1, A2) of the fifth aspect according to the embodiment, in any one of the first to fourth aspects, the optical member (4, 4A, 4B, 4D) is preferably a lens or a reflector.

[0132] The above-described lighting systems (A1, A2) can easily achieve desired light distribution characteristics.

[0133] In the lighting system (A1, A2) of the sixth aspect of the embodiment, in the second or third aspect, it is preferable that the first optical member (41, 44) is a lens or a reflector, and the second optical member (42, 45) is a lens or a reflector.

[0134] The above-described lighting systems (A1, A2) can easily achieve desired light distribution characteristics.

[0135] In the lighting system (A1, A2) of a seventh aspect according to the embodiment, in any one of the first to sixth aspects, the optical member (4, 4A, 4B, 4D) emits the second light (L2) upward more than the first light (L1), and the amount of the first light (L1) is preferably greater than the amount of the second light (L2).

[0136] In the above-mentioned lighting system (A1, A2), the first light (L1) can be used as a main light for road lighting, and the second light (L2) can be used as an auxiliary light for inspection.

[0137] Preferably, the lighting system (A1, A2) of an eighth aspect of the embodiment is any one of the first to seventh aspects, further comprising a timer circuit (6b) that measures time. The captured image data includes time data indicating the capture time of the captured image.

[0138] The above-described lighting systems (A1, A2) can associate captured images with the capture times.

[0139] In the lighting system (A1, A2) of the ninth aspect according to the embodiment, in any one of the first to eighth aspects, it is preferable that the first light (L1) and the second light (L2) are emitted simultaneously.

[0140] The above-mentioned lighting systems (A1, A2) can continue to illuminate the road even during inspection, and can maintain visibility inside the tunnel (T1) even during inspection.

[0141] It is preferable that the lighting system (A1, A2) of the tenth aspect of the embodiment, in any one of the first to ninth aspects, further comprises an inspection unit (6e, 7) that inspects the inner wall surface (T11) based on the captured image.

[0142] The above-mentioned lighting system (A1, A2) has not only the function of imaging the inner wall surface (T11) but also the function of inspecting the inner wall surface (T11) based on the captured image, so that it is possible to complete the process from imaging to inspection of the inner wall surface (T11).

[0143] In the lighting system (A1) of the eleventh aspect according to the present embodiment, in the tenth aspect, the inspection unit (6e) is preferably provided in the housing (2, 2A, 2D).

[0144] The lighting system (A1) described above can perform imaging and inspection of the inner wall surface (T11) simply by installing the lighting fixtures (1, 1A, 1B, 1D) in the tunnel (T1), thereby improving convenience.

[0145] Preferably, the lighting system (A1, A2) of the twelfth aspect of the embodiment is any one of the first to eleventh aspects, further comprising a communication unit (6c) that communicates with an external device (E1, E2).

[0146] The lighting systems (A1, A2) described above can acquire various information from the external devices (E1, E2) and store various data in the external devices (E1, E2).

[0147] In the lighting system (A1, A2) of the thirteenth aspect of the embodiment, in the twelfth aspect, it is preferable that the imaging unit (5) performs an imaging operation when the communication unit (6c) receives an imaging request.

[0148] In the above-described lighting system (A1, A2), the imaging timing of the imaging unit (5) can be set by remote control.

[0149] In the lighting system (A2) of the fourteenth aspect according to the present embodiment, in the twelfth or thirteenth aspect, the external device (E2) is preferably managed by an organization that inspects the inner wall surface (T11) based on the captured image taken by the imaging unit (5). The communication unit (6c) transmits data of the captured image to the external device (E2).

[0150] The above-mentioned lighting system (A2) can outsource the inspection of the interior wall surface (T11) based on the captured image.

[0151] It is preferable that the lighting system (A2) of the 15th aspect of the embodiment, in any one of the 12th to 14th aspects, further comprises a memory unit (6d) that stores address information for transmitting captured image data to an external device (E2).

[0152] The above-mentioned lighting system (A2) can outsource the inspection of the interior wall surface (T11) based on the captured image.

[0153] In the lighting system (A2) of the 16th aspect of the embodiment, in any one of the 12th to 15th aspects, it is preferable that the communication unit (6c) receives data on the inspection results of the inner wall surface (T11) based on the captured image from the external device (E2).

[0154] The above-mentioned lighting system (A2) can outsource the inspection of the interior wall surface (T11) based on the captured image.

[0155] The lighting system (A2) of a seventeenth aspect of the present embodiment is preferably any one of the twelfth to sixteenth aspects, further comprising an inspection unit (6e) that inspects the inner wall surface (T11) based on the captured image. The communication unit (6c) transmits a repair request for repairing the inner wall surface (T11) to the external device (E1) based on the inspection result of the inspection unit (6e).

[0156] The lighting system (A2) described above allows quick request for repair and maintenance of the interior wall surface (T11).

[0157] In the lighting system (A1, A2) of the eighteenth aspect according to the present embodiment, in any one of the twelfth to seventeenth aspects, it is preferable that the communication unit (6c) receives weather information for the area in which the tunnel (T1) is located. The imaging frequency of the imaging unit (5) is set based on the weather information.

[0158] The above-described lighting system (A1, A2) can improve inspection accuracy during bad weather and when a disaster occurs. [Explanation of symbols]

[0159] A1, A2 lighting system 1, 1A, 1B, 1D Lighting equipment (lighting system) 2, 2A, 2D housing 25 Upper plate (plate) 26 Lower plate part (plate part) 3, 3A, 3B, 3D light source 4, 4A, 4B, 4D optical components 41 Road lens (first optical member) 42 Ceiling lens (second optical component) 44 Road reflector (first optical member) 45 Ceiling reflector (second optical component) 5. Imaging unit 6b Timer circuit 6c Communications Department 6d storage section 6e Inspection Department 7. Inspection Department R1 Road T1 Tunnel T11 Inner wall L1 1st light L2 2nd light W2 Irradiation Range E1, E2 External device

Claims

1. a housing installed on an inner wall surface of a tunnel formed along a road; a light source provided in the housing and emitting illumination light; an optical member provided in the housing and onto which the illumination light is incident; an imaging unit provided in the housing, the optical member emits a first light toward the road and a second light toward the inner wall surface, The imaging unit generates data of a captured image obtained by capturing an image of at least a part of the inner wall surface that is irradiated with the second light. Lighting system.

2. The optical member includes at least a first optical member that emits the first light; a second optical member that emits the second light; The lighting system of claim 1 .

3. The second optical member is positioned below the first optical member. The lighting system of claim 2.

4. The housing includes a pair of plate portions facing each other in the vertical direction, The optical member emits the second light from an upper plate portion located above the pair of plate portions in a direction along the inner wall surface. The lighting system of claim 1 .

5. The optical member is a lens or a reflector. The lighting system of claim 1 .

6. the first optical member is a lens or a reflector, The second optical member is a lens or a reflector. The lighting system of claim 2.

7. the optical member emits the second light in a direction upward relative to the first light, The amount of the first light is greater than the amount of the second light. The lighting system of claim 1 .

8. further comprising a timer circuit for measuring time; The captured image data includes the time data indicating the time when the captured image was captured. The lighting system of claim 1 .

9. The first light and the second light are emitted simultaneously. The lighting system of claim 1 .

10. an inspection unit that inspects the inner wall surface based on the captured image; The lighting system of claim 1 .

11. The inspection unit is provided in the housing. The lighting system of claim 10.

12. Further provided is a communication unit for communicating with an external device. The lighting system of claim 1 .

13. When the communication unit receives an imaging request, the imaging unit executes an imaging operation.

13. The lighting system of claim 12.

14. the external device is managed by an organization that inspects the inner wall surface based on the captured image captured by the imaging unit, The communication unit transmits the captured image data to the external device.

13. The lighting system of claim 12.

15. The image capturing device further includes a storage unit that stores address information for transmitting the captured image data to the external device.

15. The lighting system of claim 14.

16. The communication unit receives data of an inspection result of the inner wall surface based on the captured image from the external device.

15. The lighting system of claim 14.

17. further comprising an inspection unit that inspects the inner wall surface based on the captured image, The communication unit transmits a repair request for repairing the inner wall surface to the external device based on the inspection result of the inspection unit.

13. The lighting system of claim 12.

18. the communication unit receives weather information for the area in which the tunnel is located, The imaging frequency of the imaging unit is set based on the weather information.

13. The lighting system of claim 12.

Images