Luminaire

Abstract

To improve uniformity of road surface illuminance in a traveling direction of a road.SOLUTION: A luminaire A1 comprises a first light source unit 1, and a second light source unit 2. The first light source unit 1 applies first illumination light toward a first region in a first direction that is a width direction of a road. The second light source unit 2 applies second illumination light toward a second region adjacent to the first region in a second direction that is a longitudinal direction of the road. The second light source unit 2 comprises a light source part (second light source part 21), and a reflection plate. The reflection plate reflects at least a portion of emission light from the light source part toward the second region so that at least the portion of the emission light becomes the second illumination light.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates generally to luminaires, and more particularly to luminaires that illuminate roadways. [Background technology]

[0002] Patent Document 1 describes a lighting fixture that is installed on a structure provided at the side of a road to illuminate the road surface. The lighting fixture described in Patent Document 1 includes a road lighting light source unit that includes a linear light source, a road lighting reflector that is disposed above the linear light source and reflects the light of the linear light source toward the road, and a transmissive optical element that is provided between the linear light source and the road lighting reflector.

[0003] The linear light source emits light toward the opposite side of the road to the transmissive optical element. The transmissive optical element changes the direction of the incident light toward the road and emits the light toward the road surface lighting reflector. The road surface lighting reflector reflects the light from the transmissive optical element and distributes it on the road surface. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-72241 Summary of the Invention [Problem to be solved by the invention]

[0005] The lighting fixtures described in Patent Document 1 are installed at equal intervals along the road travel direction. Therefore, depending on the interval between two adjacent lighting fixtures, the uniformity of the road surface illuminance in the road travel direction may decrease.

[0006] An object of the present disclosure is to provide a lighting fixture capable of improving the uniformity of road surface illuminance in the traveling direction of the road. [Means for solving the problem]

[0007] A lighting fixture according to one aspect of the present disclosure is a lighting fixture for illuminating a road. The lighting fixture includes a first light source unit and a second light source unit. The first light source unit emits a first illumination light toward a first region in a first direction, which is a width direction of the road. The second light source unit emits a second illumination light toward a second region adjacent to the first region in a second direction, which is a longitudinal direction of the road. The second light source unit includes a light source section and a reflector. The reflector reflects at least a portion of the emitted light from the light source section toward the second region so that at least a portion of the emitted light becomes the second illumination light. Effect of the Invention

[0008] According to a lighting device according to an aspect of the present disclosure, it is possible to improve the uniformity of road surface illuminance in the traveling direction of the road. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a block diagram of a lighting fixture according to an embodiment. [Diagram 2] FIG. 2 is a schematic diagram of the above lighting fixture. [Diagram 3] FIG. 3 is a perspective view of a second light source unit in the lighting fixture. [Figure 4] FIG. 4 is an exploded perspective view of a second light source unit in the above lighting fixture. [Diagram 5] FIG. 5 is a cross-sectional view of the second light source unit in the lighting fixture taken along line X1-X1 in FIG. [Figure 6] Fig. 6A is a front view of a reflector used in the second light source unit of the above lighting fixture, and Fig. 6B is a bottom view of the reflector used in the second light source unit of the above lighting fixture. [Figure 7] FIG. 7 is a schematic diagram showing the light distribution characteristic of the above lighting fixture. [Figure 8] FIG. 8 is a schematic diagram showing the distribution of illumination onto the road surface by the second light source unit in the above lighting fixture. [Figure 9] FIG. 9 is a side view showing the light distribution characteristics of a reflector used in the second light source unit of the above lighting fixture. [Figure 10] FIG. 10 is a front view showing the light distribution characteristics of a reflector used in the second light source unit of the above lighting fixture. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, a lighting device according to an embodiment will be described with reference to the drawings. Each figure described in the following embodiment is a schematic diagram, and the ratio of the size and thickness of each component does not necessarily reflect the actual dimensional ratio. In addition, the configuration described in the following embodiment is merely an example 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.

[0011] (Embodiment) (1) Overview First, an overview of a lighting device A1 according to an embodiment will be described with reference to FIGS. 1 and 2. FIG.

[0012] The lighting fixture A1 according to the embodiment is, for example, a road lighting fixture installed at the side of a road 300 (see FIG. 7) to illuminate the road 300. The lighting fixture A1 is installed, for example, at a low position at the side of the road 300. More specifically, the lighting fixture A1 is installed on the upper surface of a side wall 400 (see FIG. 7) provided at the side of the road 300. In the present disclosure, the "low position" refers to a height of 4 m or less from the road surface of the road 300. More preferably, the "low position" refers to a height of 2 m or less from the road surface of the road 300. Even more preferably, the "low position" refers to a height of 1.2 m or less from the road surface of the road 300. As an example, the present embodiment assumes a case where the lighting fixture A1 is installed at a height of 1.2 m from the road surface of the road 300. A plurality of such lighting fixtures A1 are installed at equal intervals along the longitudinal direction (travel direction) of the road 300 (see FIG. 7).

[0013] As shown in Figs. 1 and 2, the lighting fixture A1 according to the embodiment includes a first light source unit 1 and a second light source unit 2. The first light source unit 1 emits a first illumination light toward a first region R1 (see Fig. 7) in a first direction D1. The first direction D1 is the width direction of a road 300 (see Fig. 7). The second light source unit 2 emits a second illumination light toward a second region R2 (see Fig. 7) adjacent to the first region R1 in a second direction D2. The second direction D2 is the longitudinal direction of the road 300. The second light source unit 2 includes a second light source section 21 (light source section) and a reflector 222 (see Fig. 4). The reflector 222 reflects at least a part of the emitted light from the second light source section 21 toward the second region R2 so that at least a part of the emitted light becomes the second illumination light. In this disclosure, the “first region R1 in the first direction D1” is a region that is irradiated with the first illumination light from the first light source unit 1 and is located in front of the first light source unit 1.

[0014] In the lighting fixture A1 according to the embodiment, the first light source unit 1 emits a first illumination light toward the first region R1, and the second light source unit 2 emits a second illumination light toward the second region R2. This makes it possible to equalize the road surface illumination in the first region R1 and the road surface illumination in the second region R2, thereby improving the uniformity of the road surface illumination in the travel direction of the road 300.

[0015] (2) Details Next, details of the lighting device A1 according to this embodiment will be described with reference to FIGS.

[0016] As described above, the lighting fixture A1 according to the embodiment is a road lighting fixture that illuminates the road 300 (see FIG. 7), and is installed at a low position on the side of the road 300. The lighting fixture A1 according to the embodiment includes a first light source unit 1, a second light source unit 2, and a power supply device 3, as shown in FIG.

[0017] (2.1) First light source unit The first light source unit 1 is, for example, a reflective light source unit that uses a reflector included in a first optical member 12 described below. As shown in Fig. 1, the first light source unit 1 includes a first light source section 11, a first optical member 12, and a first housing 10 (see Fig. 2).

[0018] The first light source unit 11 emits light that can become the first illumination light to be irradiated toward the first region R1 (see FIG. 7). That is, at least a portion of the light emitted from the first light source unit 11 becomes the first illumination light. The first light source unit 11 has a first substrate and a plurality of first light-emitting elements. The first substrate is, for example, a rectangular printed wiring board that is long in one direction (the left-right direction in FIG. 2). Each of the plurality of first light-emitting elements is, for example, an LED. The plurality of first light-emitting elements are mounted on one surface of the first substrate at equal intervals along the longitudinal direction of the first substrate.

[0019] The first optical member 12 includes, for example, a reflector. The reflector is formed long along, for example, one direction (the left-right direction in FIG. 2). The reflector has, for example, a reflecting surface made of a concave curved surface recessed in an arc shape on the side opposite to the first light source unit 11. The reflector reflects at least a part of the light emitted from the first light source unit 11 at the reflecting surface, thereby irradiating the first illumination light toward the first region R1 (see FIG. 7). That is, the first light source unit 1 irradiates the first illumination light toward the first region R1 in a first direction D1 (see FIG. 7), which is the width direction of the road 300 (see FIG. 7).

[0020] The first housing 10 accommodates the first light source unit 11 and the first optical member 12. In this embodiment, the first housing 10 further accommodates the power supply device 3. The first housing 10 is, for example, a rectangular parallelepiped box that is long in one direction (the left-right direction in FIG. 2). The first housing 10 has a rectangular opening window 101 formed along the longitudinal direction of the first housing 10 (the left-right direction in FIG. 2). The opening window 101 is a hole for emitting the first illumination light toward the first region R1 (see FIG. 7). The opening window 101 is closed by a light-transmitting panel 13 attached to the first housing 10 by appropriate attachment means (for example, a screw). The light-transmitting panel 13 is formed in a rectangular shape that is long in one direction (the left-right direction in FIG. 2) from a material having light transmission (for example, acrylic resin or glass). In the first light source unit 1 configured in this manner, the first illumination light is transmitted through the light-transmitting panel 13 and passes through the opening window 101, and is irradiated toward the first region R1.

[0021] (2.2) Second light source unit The second light source unit 2 is, for example, a reflection type light source unit using a reflector 222 (see FIG. 4) included in a second optical member 22 described later. As shown in FIG. 1, the second light source unit 2 includes a second light source section 21, a second optical member 22, and a second housing 20 (see FIG. 2).

[0022] The second light source section 21 emits light that can become the second illumination light that is irradiated toward the second region R2 (see FIG. 7). That is, at least a part of the light emitted from the second light source section 21 becomes the second illumination light. In this embodiment, the second light source section 21 corresponds to the light source section. Details of the second light source section 21 will be described in detail in the section "(3) Structure of the second light source unit."

[0023] The second optical member 22 includes, for example, a reflector 222 (see FIG. 4). The reflector 222 reflects at least a part of the light emitted from the second light source unit 21, thereby irradiating the second illumination light toward the second region R2 (see FIG. 7). That is, the reflector 222 reflects at least a part of the light emitted from the second light source unit 21 toward the second region R2 so that at least a part of the light emitted from the second light source unit 21 becomes the second illumination light. As described later, the second region R2 is an area adjacent to the first region R1 in a second direction D2 (see FIG. 7), which is the longitudinal direction of the road 300 (see FIG. 7). Therefore, the second light source unit 2 irradiates the second illumination light toward the second region R2 adjacent to the first region R1 in the second direction D2, which is the longitudinal direction of the road 300. Details of the reflector 222 will be described in detail in the section "(3) Structure of the second light source unit".

[0024] The second housing 20 houses the second light source unit 21 and the second optical member 22. As shown in FIG. 2, the second housing 20 is, for example, a rectangular parallelepiped box. The second housing 20 is integrally connected to the first housing 10 by appropriate mounting means. Details of the second housing 20 will be described in detail in the section "(3) Structure of the second light source unit."

[0025] (2.3) Power supply device The power supply device 3 includes, for example, an AC / DC converter that converts AC power supplied from an external AC power source PS (for example, a commercial power source) into DC power. The power supply device 3 supplies the DC power converted by the AC / DC converter to the first light source unit 1 and the second light source unit 2. In this embodiment, as described above, the power supply device 3 is accommodated in the first housing 10 of the first light source unit 1.

[0026] (3) Structure of the second light source unit Next, the structure of the second light source unit 2 will be described with reference to Figs. 3 to 6B. In the following description, unless otherwise specified, the up-down, left-right, and front-rear directions of the second light source unit 2 are defined by the arrows shown in Figs. 3 to 5. That is, when the second light source unit 2 is viewed from the front, the vertical direction is defined as the up-down direction, the left-right direction is defined as the left-right direction, and the direction perpendicular to both the up-down direction and the left-right direction is defined as the front-rear direction. However, these directions are not intended to define the direction in which the second light source unit 2 is used. Also, the arrows shown in Figs. 3 to 5 are merely shown for the purpose of assisting in the description and do not have any substance.

[0027] 3 and 4, the second light source unit 2 has a second light source section 21, a second optical member 22, and a second housing 20. The second light source unit 2 further has a translucent panel 23, a first mounting member 24, a pair of second mounting members 25, and a plurality of fixing members 26 (four in the illustrated example).

[0028] (3.1)Second light source section The second light source unit 21 includes a plate 211 and a second substrate 212, as shown in FIGS.

[0029] The plate 211 is a rectangular plate that is longer in the left-right direction than in the up-down direction. The plate 211 has a pair of through holes 214. The pair of through holes 214 penetrate the plate 211 in the thickness direction at one end (the upper end in FIG. 4) in the width direction (up-down direction) of the plate 211. A screw S3 for attaching the plate 211 to the first attachment member 24 is inserted into each of the pair of through holes 214.

[0030] The second substrate 212 is a rectangular printed wiring board that is longer in the left-right direction than in the top-bottom direction. One or more second light-emitting elements are mounted on one surface (the bottom surface in FIG. 5) of the second substrate 212. The second substrate 212 is attached to one surface (the bottom surface in FIG. 5) of the plate 211 by appropriate attachment means (e.g., screws).

[0031] The second light source unit 21 is attached to the second mounting portion 242 of the first mounting member 24 by screwing two screws S3, which are respectively inserted into a pair of through holes 214 provided in the plate 211, into two screw holes 246 provided in the second mounting portion 242 of the first mounting member 24 described below (see Figure 5).

[0032] (3.2) Second Optical Member The second optical member 22 has a reflecting function of reflecting at least a part of the light emitted from the second light source unit 21 toward the second region R2 (see FIG. 7). The second optical member 22 includes a plate 221 and a reflecting plate 222, as shown in FIGS. 4 to 6B.

[0033] 6A and 6B, the plate 221 is a rectangular plate that is longer in the left-right direction than in the up-down direction. The plate 221 has four through holes 223. The four through holes 223 penetrate the plate 221 in the thickness direction at four corners of the plate 221. A screw S4 for attaching the plate 221 to the first attachment member 24 is inserted into each of the four through holes 223.

[0034] The reflector 222 has a reflecting surface 224 including one or more curved surfaces. In this embodiment, the reflecting surface 224 includes a plurality of curved surfaces. The plurality of radii of curvature in the plurality of curved surfaces are different from each other. That is, when the reflecting surface 224 includes a plurality of curved surfaces as the one or more curved surfaces, the plurality of radii of curvature in the plurality of curved surfaces are different from each other. As a result, as shown in FIGS. 6A and 6B, the shape of the reflecting surface 224 of the reflector 222 is asymmetric between one end side (left side in FIG. 6A) and the other end side (right side in FIG. 6A) with respect to the reference line RL1 when the reflector 222 is viewed from the front.

[0035] The second optical member 22 is attached to the first mounting portion 241 of the first mounting member 24 by screwing four screws S4 inserted into four through holes 223 provided at the four corners of the plate 221 into four screw holes 245 provided at the four corners of the first mounting portion 241 of the first mounting member 24 described below (see Figure 5).

[0036] (3.3) Translucent Panel The light-transmitting panel 23 is, for example, a rectangular plate made of a light-transmitting material (for example, acrylic resin or glass) that is longer in the left-right direction than in the up-down direction. The outer dimensions of the light-transmitting panel 23 are larger than the opening dimensions of a rectangular opening window 204 provided in the cover 202 described below. Therefore, when the light-transmitting panel 23 is attached to the cover 202, the opening window 204 is blocked by the light-transmitting panel 23 (see FIG. 5).

[0037] (3.4) First mounting member The first mounting member 24 is a member for mounting the second light source unit 21 and the second optical member 22 to the second housing 20. As shown in Fig. 4, the first mounting member 24 has a first mounting portion 241, a second mounting portion 242, a connecting portion 243, and a pair of fixing portions 244. In this embodiment, the first mounting portion 241, the second mounting portion 242, the connecting portion 243, and the pair of fixing portions 244 are integrally formed by, for example, sheet metal.

[0038] The first mounting portion 241 has a rectangular shape when viewed from the front. The first mounting portion 241 has four screw holes 245. The four screw holes 245 are provided at four corners of the first mounting portion 241. A screw S4 for mounting the second optical member 22 to the first mounting portion 241 is screwed into each of the four screw holes 245.

[0039] The second mounting portion 242 has a rectangular shape that is longer in the left-right direction than in the up-down direction when viewed from the front. The second mounting portion 242 has a pair of screw holes 246. The pair of screw holes 246 are provided at both ends in the longitudinal direction (left-right direction) of the second mounting portion 242. A screw S3 for mounting the second light source unit 21 to the second mounting portion 242 is screwed into each of the pair of screws 246.

[0040] The connecting portion 243 connects the first mounting portion 241 and the second mounting portion 242. In a state in which the first mounting portion 241 and the second mounting portion 242 are connected by the connecting portion 243, the first mounting portion 241 and the second mounting portion 242 face each other (see FIGS. 4 and 5).

[0041] Each of the pair of fixing parts 244 is L-shaped in a plan view from the top-bottom direction. Each of the pair of fixing parts 244 has a first piece 248 and a second piece 249. The first piece 248 is trapezoidal in a plan view from the left-right direction, and extends rearward from the left end or right end of the first mounting part 241. The second piece 249 is rectangular and elongated in the up-down direction in a plan view from the front-rear direction, and extends rightward or leftward from the rear end of the first piece 248. The second piece 249 also has a pair of screw holes 247. The pair of screw holes 247 are provided at both ends of the second piece 249 in the longitudinal direction (up-down direction). A screw S5 (see FIG. 5) for attaching the first mounting member 24 to the case 201 of the second housing 20 is screwed into each of the pair of screw holes 247.

[0042] (3.5) Second mounting member The pair of second mounting members 25 are members for mounting the light-transmitting panel 23 to the second housing 20. Each of the pair of second mounting members 25 is long in the left-right direction. Each of the pair of second mounting members 25 has a fixed piece 251, a clamping piece 252, and a connecting piece 253. In this embodiment, the fixed piece 251, the clamping piece 252, and the connecting piece 253 are integrally formed by, for example, sheet metal. Each of the second mounting members 25 is S-shaped in a plan view from the left-right direction (see FIG. 5).

[0043] The fixing piece 251 has a pair of screw holes 254. The pair of screw holes 254 are provided at both ends of the fixing piece 251 in the longitudinal direction (left-right direction). A screw S2 for attaching the second attachment member 25 to the cover 202 of the second housing 20 is screwed into each of the pair of screw holes 254. When the second attachment member 25 is attached to the cover 202, the clamping piece 252 clamps the light-transmitting panel 23 between itself and the front plate 2021 of the cover 202 (see FIG. 5). The connecting piece 253 connects the fixing piece 251 and the clamping piece 252.

[0044] (3.6) Second housing The second housing 20 is a rectangular parallelepiped box that is longer in the left-right direction than in the up-down direction, as shown in Fig. 3. The second housing 20 has a case 201 and a cover 202, as shown in Figs.

[0045] As shown in Figures 4 and 5, the case 201 is formed, for example, from sheet metal into a box shape with an open front. The case 201 has a rear plate 2011 and four side plates 2012. The rear plate 2011 and each of the four side plates 2012 are rectangular when viewed from the front. Each of the side plates 2012 extends forward from an edge of the rear plate 2011. The rear plate 2011 has four through holes 207 (only two are shown in Figure 4). A screw S5 (see Figure 5) for attaching the first mounting member 24 to the case 201 is inserted into each of the four through holes 207.

[0046] Four fixing members 26 are attached to the four corners of the front surface of the case 201. Each of the four fixing members 26 is in the shape of a strip that is long in the left-right direction, with a central portion in the left-right direction protruding forward. A screw hole 261 is provided in the central portion of each fixing member 26. A screw S1 for attaching the cover 202 to the case 201 is screwed into the screw hole 261 of each fixing member 26.

[0047] 4 and 5, the cover 202 is formed, for example, from sheet metal into a flat box shape with an open rear surface. The cover 202 has a front plate 2021 and four side plates 2022. The front plate 2021 and each of the four side plates 2022 are rectangular when viewed from the front. Each side plate 2022 extends rearward from an edge of the front plate 2021.

[0048] As shown in FIG. 4, the front plate 2021 has an opening window 204, a plurality of (four in the illustrated example) through holes 205, and a plurality of (four in the illustrated example) through holes 206. The opening window 204 penetrates the front plate 2021 in the thickness direction at the center of the front plate 2021. The opening window 204 has a rectangular shape that is longer in the left-right direction than in the up-down direction. The four through holes 205 penetrate the front plate 2021 in the thickness direction at the four corners of the front plate 2021. A screw S1 for attaching the cover 202 to the case 201 is inserted into each of the four through holes 205. The four through holes 206 penetrate the front plate 2021 in the thickness direction around the opening window 204. A screw S2 for attaching the second mounting member 25 to the cover 202 is inserted into each of the four through holes 206.

[0049] (4) Light distribution characteristics Next, the light distribution characteristic of the lighting device A1 according to this embodiment will be described with reference to FIGS.

[0050] As shown in Fig. 7, a plurality of lighting fixtures A1 according to the embodiment are installed at equal intervals along a second direction D2, which is the longitudinal direction of a road 300. In the example of Fig. 7, two lighting fixtures A1 (hereinafter also referred to as "first lighting fixture A1") and a second lighting fixture A2 are installed along the second direction D2. A distance P1 between the first lighting fixture A1 and the second lighting fixture A2 in the second direction D2 is, for example, 20 m.

[0051] 7, the road 300 has a plurality of lanes 301, 302 (two in the illustrated example) and a roadside strip 303. In a first direction D1, a side wall 400 is provided along a second direction D2 on the opposite side of the roadside strip 303 from the lane 301 side. The first lighting fixture A1 and the second lighting fixture A2 are installed on an upper surface of the side wall 400. Here, the first direction D1 is the width direction of the road 300, and in this embodiment, the first direction D1 and the second direction D2 are perpendicular to each other.

[0052] In Fig. 7, a first region R1 represents an illumination region of the first illumination light emitted from the first light source unit 1 of each of the first lighting fixture A1 and the second lighting fixture A2. In Fig. 7, a second region R2 represents an illumination region of the second illumination light emitted from the second light source unit 2 of the first lighting fixture A1. In the example of Fig. 7, a vehicle travels from left to right in both lanes 301 and 302. That is, in this embodiment, the second region R2 is adjacent to the first region R1 in the second direction D2, and is located on the traveling side of the vehicle traveling on the road 300 with respect to the first region R1 (the right side in Fig. 7).

[0053] The second light source unit 2 of the first lighting device A1 further irradiates a third illumination light toward the first region R1. In the example of Fig. 7, the third illumination light is irradiated toward a third region R3 that is a part of the first region R1. As shown in Fig. 7, the amount of the second illumination light irradiated toward the second region R2 is greater than the amount of the third illumination light irradiated toward the third region R3 that is a part of the first region R1.

[0054] Here, as shown in Fig. 8, the angle α1 between the second direction D2 and the fourth direction D4 is preferably 10 degrees or more and 25 degrees or less when viewed from the third direction D3 (see Fig. 9). More preferably, the angle α1 is, for example, 20 degrees. Here, the third direction D3 is a direction perpendicular to both the first direction D1 and the second direction D2, and is a direction perpendicular to the paper surface of Fig. 8. Also, the fourth direction D4 is a direction of light with maximum luminous intensity among the second illumination light irradiated from the second light source unit 2 in the first lighting device A1 toward the second region R2.

[0055] 9, the angle β1 between the fourth direction D4 and the fifth direction D5 on the plane PL1 is preferably 1 degree or more and 15 degrees or less. More preferably, the angle β1 is, for example, 1 degree. The plane PL1 is a plane including the third direction D3 and the fourth direction D4. The fifth direction D5 is a direction perpendicular to the third direction D3 on the plane PL1.

[0056] In the present embodiment, the interval P1 (see FIG. 8) between the first lighting fixture A1 and the second lighting fixture A2 installed along the second direction D2 is, for example, 20 m, as described above. Also, the height H1 (see FIG. 9) of each of the first lighting fixture A1 and the second lighting fixture A2 from the road 300 is, for example, 1.2 m, as described above. Therefore, in the present embodiment, the ratio of the interval P1 to the height H1 is about 16.7. In this way, the ratio of the interval P1 in the second direction D2 between the second lighting fixture A2 adjacent to the first lighting fixture A1 in the second direction D2 and the first lighting fixture A1 to the height H1 of the first lighting fixture A1, which is the lighting fixture A1, from the road 300 is preferably 5 or more. Also, the ratio of the interval P1 to the height H1 is preferably 20 or less. In short, the interval P1 between the first lighting fixture A1 and the second lighting fixture A2 to the height H1 of the first lighting fixture A1 is preferably 5 or more and 20 or less.

[0057] 2, it is preferable that the angle θ1 between the second direction D2 and the sixth direction D6 is 25 degrees or more and 45 degrees or less when viewed from the third direction D3. The sixth direction D6 is the direction of the optical axis Ax1 of the second light source unit 2. The "optical axis Ax1 of the second light source unit 2" is an axis defined by a virtual light ray that is a representative of the luminous flux of light irradiated from the second light source unit 2.

[0058] Furthermore, as described above, the shape of the reflecting surface 224 of the reflector 222 is asymmetric between one end side and the other end side with respect to the reference line RL1 when the reflector 222 is viewed from the front (see FIGS. 6A and 6B). More specifically, the shape of the reflecting surface 224 of the reflector 222 is such that the amount of the second illumination light irradiated toward the second region R2 is greater than the amount of the third illumination light irradiated toward the third region R3, which is a part of the first region R1. As shown in FIG. 10, the light B1 emitted from the second light source unit 21 to the portion of the reflector 222 indicated by the two-dot chain line a1 is reflected by the reflecting surface 224 of the reflector 222 and is irradiated toward the second region R2 located to the right.

[0059] (5) Effects In the lighting fixture A1 according to the embodiment, the first light source unit 1 emits a first illumination light toward the first region R1, and the second light source unit 2 emits a second illumination light toward the second region R2. This makes it possible to equalize the road surface illumination in the first region R1 and the road surface illumination in the second region R2, thereby improving the uniformity of the road surface illumination in the travel direction of the road 300.

[0060] Furthermore, the lighting fixture A1 according to the embodiment is installed at a low position on the side of the road 300. This makes it possible to increase the illuminance of the road surface 300 compared to a case in which the lighting fixture A1 is installed at a high position (for example, 10 m).

[0061] Furthermore, in the lighting device A1 according to the embodiment, the second region R2 is located on the traveling side of the vehicle traveling on the road 300 with respect to the first region R1. This makes it possible to reduce glare for vehicle occupants.

[0062] Furthermore, in the lighting device A1 according to the embodiment, the reflector 222 has a reflecting surface 224 including one or more curved surfaces. In particular, in this embodiment, the reflecting surface 224 includes a plurality of curved surfaces having different radii of curvature. This makes it possible to adjust the amount of light entering the second region R2.

[0063] In addition, in the lighting device A1 according to the embodiment, the shape of the reflective surface 224 of the reflector 222 is asymmetric between one end side and the other end side with respect to the reference line RL1 when viewed from the front of the reflector 222. This makes it possible to adjust the amount of light emitted by the second light source unit 2 to the second region R2.

[0064] Furthermore, in the lighting device A1 according to this embodiment, the amount of the second illumination light is greater than the amount of the third illumination light, which makes it possible to uniform the amount of light in the first region R1 and the amount of light in the second region R2.

[0065] In addition, in the lighting device A1 according to the embodiment, the angle α1 between the fourth direction D4, which is the direction of the second illumination light with the maximum luminous intensity as viewed from the third direction D3, and the second direction D2 is equal to or greater than 10 degrees and equal to or less than 25 degrees. This makes it possible to increase the amount of light from the second light source unit 2 to the second region R2.

[0066] In addition, in the lighting device A1 according to the embodiment, in a plane PL1 including the fourth direction D4 and the third direction D3, an angle β1 between a fifth direction D5, which is a direction perpendicular to the third direction D3, and the fourth direction D4 is 1 degree or more and 15 degrees or less, thereby making it possible to suppress glare for vehicle occupants.

[0067] In addition, in the lighting device A1 according to the embodiment, the angle θ1 between the direction of the optical axis Ax1 of the second light source unit 2 and the second direction D2 when viewed from the third direction D3 is equal to or greater than 25 degrees and equal to or less than 45 degrees. This makes it possible to increase the amount of light from the second light source unit 2 to the second region R2.

[0068] Furthermore, in the lighting fixture A1 according to the embodiment, the ratio of the distance P1 between the adjacent second lighting fixture A2 and the height H1 from the road 300 is equal to or greater than 5. This makes it possible to improve the uniformity of the road surface illuminance over a wide range in the travel direction of the road 300.

[0069] (6) Variations The above-described embodiment is merely one of various embodiments of the present disclosure. The above-described embodiment can be modified in various ways depending on the design and the like as long as the object of the present disclosure can be achieved. Below, modifications of the above-described embodiment are listed. The modifications described below can be applied in appropriate combination.

[0070] In the above-described embodiment, the reflector 222 has a reflecting surface 224 including one or more curved surfaces. In contrast, the reflector 222 may have a reflecting surface including one or more flat surfaces. When the reflecting surface includes a plurality of flat surfaces as the one or more flat surfaces, it is preferable that the normal directions of the plurality of flat surfaces are different from each other. The reflector 222 may have a reflecting surface including both one or more curved surfaces and one or more flat surfaces. That is, it is sufficient for the reflector 222 to have a reflecting surface including at least one of one or more curved surfaces and one or more flat surfaces.

[0071] In the above-described embodiment, the power supply device 3 is housed in the first housing 10 of the first light source unit 1. In contrast, the power supply device 3 may be housed in, for example, the second housing 20 of the second light source unit 2, or in a housing other than the first housing 10 and the second housing 20.

[0072] In the above embodiment, one power supply device 3 supplies DC power to both the first light source unit 1 and the second light source unit 2. Alternatively, a power supply device may be provided for each light source unit. For example, the first power supply device may supply DC power to the first light source unit 1, and the second power supply device may supply DC power to the second light source unit 2.

[0073] In the above-described embodiment, the power supply device 3 supplies DC power to each of the first light source unit 1 and the second light source unit 2. In contrast, the power supply device 3 may supply AC power to each of the first light source unit 1 and the second light source unit 2, for example. In this case, in each of the first light source unit 1 and the second light source unit 2, the AC power is converted into DC power by an AC / DC converter.

[0074] In the above-described embodiment, the second area R2 is located on the traveling side of the vehicle traveling on the road 300 with respect to the first area R1. In contrast, the second area R2 may be located on the opposite side of the traveling side of the vehicle traveling on the road 300 with respect to the first area R1 (i.e., on the vehicle side).

[0075] (Aspect) The present specification discloses the following aspects.

[0076] The lighting fixture (A1) according to the first embodiment is a lighting fixture (A1) that illuminates a road (300). The lighting fixture (A1) includes a first light source unit (1) and a second light source unit (2). The first light source unit (1) emits a first illumination light toward a first region (R1) in a first direction (D1). The first direction (D1) is the width direction of the road (300). The second light source unit (2) emits a second illumination light toward a second region (R2) adjacent to the first region (R1) in a second direction (D2). The second direction (D2) is the longitudinal direction of the road (300). The second light source unit (2) includes a light source section (21) and a reflector (222). The reflector (222) reflects at least a part of the emitted light from the light source section (21) toward the second region (R2) so that at least a part of the emitted light becomes the second illumination light.

[0077] According to this embodiment, the first illumination light from the first light source unit (1) is irradiated onto the first region (R1), and the second illumination light from the second light source unit (2) is irradiated onto the second region (R2), thereby making it possible to improve the uniformity of the road surface illuminance in the traveling direction of the road (300).

[0078] The lighting fixture (A1) according to the second embodiment is installed at a low position on the side of a road (300) in the first embodiment.

[0079] According to this embodiment, it is possible to increase the road surface illuminance compared to when the lighting fixture (A1) is installed at a higher position.

[0080] In the lighting fixture (A1) according to the third aspect, in the first or second aspect, the second area (R2) is located on the traveling side of a vehicle traveling on a road (300) with respect to the first area (R1).

[0081] According to this aspect, it is possible to reduce glare for vehicle occupants.

[0082] In the lighting device (A1) according to a fourth aspect, in any one of the first to third aspects, the reflector (222) has a reflecting surface (224) including at least one of one or more curved surfaces and one or more flat surfaces.

[0083] According to this embodiment, it is possible to adjust the amount of light emitted by the second light source unit (2) to the second region (R2).

[0084] In a lighting fixture (A1) according to a fifth aspect, when the reflective surface (224) includes a plurality of curved surfaces as the one or more curved surfaces in the fourth aspect, the plurality of radii of curvature in the plurality of curved surfaces are different from one another.

[0085] In the lighting device (A1) according to the sixth aspect, when the reflective surface (224) includes a plurality of planes as the one or more planes in the fourth or fifth aspect, the normal directions in the plurality of planes are different from one another.

[0086] In the lighting device (A1) according to the seventh aspect, in any one of the fourth to sixth aspects, the shape of the reflective surface (224) of the reflector (222) is asymmetrical between one end and the other end with respect to the reference line (RL1) when the reflector (222) is viewed from the front.

[0087] According to this embodiment, it is possible to adjust the amount of light emitted by the second light source unit (2) to the second region (R2).

[0088] In the lighting device (A1) according to an eighth aspect, in any one of the first to seventh aspects, the second light source unit (2) further irradiates a third illumination light toward the first region (R1). The amount of the second illumination light is greater than the amount of the third illumination light.

[0089] According to this embodiment, it is possible to make the amount of light in the first region (R1) and the amount of light in the second region (R2) uniform.

[0090] In a lighting device (A1) according to a ninth aspect, in any one of the first to eighth aspects, an angle (α1) between a direction (D4) of the second illumination light having the maximum luminous intensity and the second direction (D2) when viewed from the third direction (D3) is 10 degrees or more and 25 degrees or less. The third direction (D3) is a direction perpendicular to both the first direction (D1) and the second direction (D2).

[0091] According to this embodiment, it is possible to increase the amount of light from the second light source unit (2) to the second region (R2).

[0092] In a lighting device (A1) according to the tenth aspect, in the ninth aspect, in a plane (PL1) including the light direction (D4) and the third direction (D3), an angle (β1) between a direction (D5) perpendicular to the third direction (D3) and the light direction (D4) is greater than or equal to 1 degree and less than 15 degrees.

[0093] According to this aspect, it is possible to reduce glare for vehicle occupants.

[0094] In a lighting device (A1) according to an eleventh aspect, in any one of the first to tenth aspects, when viewed from the third direction (D3), an angle (θ1) between a direction (D6) of an optical axis (Ax1) of the second light source unit (2) and the second direction (D2) is 25 degrees or more and 45 degrees or less. The third direction (D3) is a direction perpendicular to both the first direction (D1) and the second direction (D2).

[0095] According to this embodiment, it is possible to increase the amount of light emitted by the second light source unit (2) to the second region (R2).

[0096] In a lighting fixture (A1) according to a twelfth aspect, in any one of the first to eleventh aspects, the ratio of the distance (P1) in the second direction (D2) between the second lighting fixture (A2) and the first lighting fixture (A1) to the height (H1) from the road (300) of the first lighting fixture (A1), which is the lighting fixture (A1), is not less than 5. The second lighting fixture (A2) is adjacent to the first lighting fixture (A1) in the second direction (D2).

[0097] According to this embodiment, it is possible to improve the uniformity of the road surface illuminance in the traveling direction of the road (300) over a wide range.

[0098] The configurations according to the second to twelfth aspects are not essential to the lighting fixture (A1) and may be omitted as appropriate. [Explanation of symbols]

[0099] 1 First light source unit 2 Second light source unit 21 Second light source section (light source section) 222 Reflector 224 Reflective surface 300 road A1 Lighting fixture (first lighting fixture) A2 2nd lighting fixture Ax1 optical axis D1 1st direction D2 2nd direction D3 Third direction D4 4th direction (direction of light with maximum luminosity) D5 5th direction D6 6th direction (optical axis direction) H1 Height P1 Interval PL1 plane R1 1st area R2 2nd area RL1 Reference Line α1 angle β1 angle θ1 angle

Claims

1. A lighting fixture for illuminating a road, a first light source unit that irradiates a first area in a first direction, which is a width direction of the road, with a first illumination light; a second light source unit that irradiates a second illumination light toward a second area adjacent to the first area in a second direction that is a longitudinal direction of the road, The second light source unit is A light source unit; a reflector that reflects at least a portion of the emitted light from the light source unit toward the second area so that at least a portion of the emitted light becomes the second illumination light. Lighting fixtures.

2. Installed at a low position on the side of the road, 2. A lighting fixture according to claim 1.

3. The second area is located on a traveling side of a vehicle traveling on the road with respect to the first area.

3. A lighting device according to claim 1 or 2.

4. The reflector has a reflecting surface including at least one of one or more curved surfaces and one or more flat surfaces.

3. A lighting device according to claim 1 or 2.

5. When the reflecting surface includes a plurality of curved surfaces as the one or more curved surfaces, a plurality of radii of curvature in the plurality of curved surfaces are different from each other.

5. A lighting device according to claim 4.

6. When the reflecting surface includes a plurality of planes as the one or more planes, a plurality of normal directions in the plurality of planes are different from each other.

5. A lighting device according to claim 4.

7. The shape of the reflecting surface of the reflector is asymmetric between one end side and the other end side with respect to a reference line when the reflector is viewed from the front.

5. A lighting device according to claim 4.

8. The second light source unit further irradiates a third illumination light toward the first area, The amount of the second illumination light is greater than the amount of the third illumination light.

3. A lighting device according to claim 1 or 2.

9. When viewed from a third direction perpendicular to both the first direction and the second direction, an angle between a direction of light having a maximum luminous intensity of the second illumination light and the second direction is equal to or greater than 10 degrees and equal to or less than 25 degrees.

3. A lighting device according to claim 1 or 2.

10. In a plane including the direction of the light and the third direction, an angle between the direction perpendicular to the third direction and the direction of the light is 1 degree or more and 15 degrees or less.

10. A lighting device according to claim 9.

11. When viewed from a third direction perpendicular to both the first direction and the second direction, an angle between a direction of an optical axis of the second light source unit and the second direction is 25 degrees or more and 45 degrees or less.

3. A lighting device according to claim 1 or 2.

12. a ratio of a distance in the second direction between a second lighting fixture adjacent to the first lighting fixture in the second direction and the first lighting fixture to a height of the first lighting fixture from the road is 5 or more; 3. A lighting device according to claim 1 or 2.

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