Illumination lens, illumination device, and illumination system

Abstract

An illumination lens according to an embodiment of the present invention is employed in an illuminating device installed on a road, and is disposed in such a way that the optical axis thereof is perpendicular the X-direction. The illumination lens is provided with: an incident surface which accepts light emitted from a light source; an emission surface for emitting the light incident on the incident surface; regions formed on each of the incident surface and the emission surface in such a way as to shine first light onto the road on the side thereof in a direction of travel; and regions formed on each of the incident surface and the emission surface in such a way as to shine light that is more diffuse than the first light onto the road on the side thereof opposite to the direction of travel.

Description

[Technical Field]

[0001] The present invention relates to an illumination lens, an illumination device, and an illumination system. [Background technology]

[0002] Traditionally, road lighting equipment has used mercury lamps and high-pressure sodium lamps. However, in recent years, lighting equipment using light-emitting elements such as LEDs (Light Emitting Diodes) as light sources has come into practical use in order to achieve longer life, higher brightness, and lower power consumption.

[0003] Furthermore, Patent Document 1 discloses a light distribution control lens used in a lamp (illumination device). By using the light distribution control lens of Patent Document 1 in an illumination device that uses an LED as a light source, the illumination range of the illumination device can be widened. This allows the installation intervals of illumination devices to be widened, thereby reducing the installation costs of the illumination devices. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6604593 Summary of the Invention

[0005] An illumination lens according to one embodiment of the present invention is an illumination lens used in an illumination device installed on a road, and is arranged so that its front direction is perpendicular to a parallel direction that is a direction along the direction of travel of the road, and is equipped with an incident surface that receives light emitted from a light source, an exit surface that emits light that is incident on the incident surface, a first region formed on at least one of the incident surface and the exit surface so as to irradiate first light toward the direction of travel of the road, and a second region formed on at least one of the incident surface and the exit surface so as to irradiate light that is more diffused than the first light toward the side opposite the direction of travel of the road. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 2 is a front view of the illumination lens according to the embodiment. [Figure 2] FIG. 2 is a side view of the illumination lens according to the embodiment. [Figure 3] FIG. 1 is a perspective view of an illumination lens according to an embodiment of the present invention. [Figure 4] FIG. 3 is a side view showing light rays emitted from the illumination lens according to the embodiment. [Figure 5] FIG. 2 is a cross-sectional view showing an installation state of the lighting device according to the embodiment. [Figure 6] FIG. 1 is a plan view showing an installation state of a lighting device according to an embodiment of the present invention. [Figure 7] FIG. 3 is a diagram showing the illuminance distribution of the lighting device according to the embodiment. [Figure 8] FIG. 3 is a diagram showing the illuminance distribution of the lighting device according to the embodiment. [Figure 9] FIG. 3 is a diagram showing the illuminance distribution of the lighting device according to the embodiment. [Figure 10] FIG. 3 is a diagram showing the illuminance distribution of the lighting device according to the embodiment. [Figure 11] FIG. 3 is a diagram showing the illuminance distribution of the lighting device according to the embodiment. [Figure 12] FIG. 2 is a plan view showing the arrangement of lighting devices in the lighting system according to the embodiment. [Figure 13] FIG. 10 is a front view showing another example of the illumination lens according to the present embodiment. [Figure 14] FIG. 10 is a perspective view showing another example of the illumination lens according to the embodiment. [Figure 15] FIG. 15 is a cross-sectional view of an illumination device using the illumination lens of FIG. [Figure 16A] FIG. 10 is a plan view showing the illuminance distribution of another example of the illumination lens according to the embodiment. [Figure 16B] FIG. 10 is a plan view showing the illuminance distribution of another example of the illumination lens according to the embodiment. [Figure 16C] FIG. 10 is a plan view showing the illuminance distribution of another example of the illumination lens according to the embodiment. [Figure 17] FIG. 3 is a side view showing light rays emitted from the illumination lens according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0007] In order to increase the installation interval of lighting devices, it is necessary to increase the light distribution of the lighting devices and to strengthen the light emitted by the lighting devices. In this case, if the light distribution of the lighting devices is too wide or the light emitted by the lighting devices is too strong, the brightness of the road surface will increase. As a result, strong light may enter the field of vision of drivers of vehicles traveling on the road, causing glare.

[0008] Therefore, an object of an embodiment of the present invention is to reduce glare while widening the illumination range of a lighting device.

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. The following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the present invention, its applications, or its uses.

[0010] (Lighting lens configuration) Fig. 1 shows a front view of the lighting lens according to this embodiment, Fig. 2 shows a side view of the lighting lens according to this embodiment, and Fig. 3 shows a perspective view of the lighting lens according to this embodiment. Fig. 4 is a side view showing light rays emitted from the lighting lens according to this embodiment. In the following description, the X direction indicates a parallel direction along the direction of travel of a road 21 (described later), the Y direction indicates the front direction of the lighting lens 1, and the Z direction indicates a vertical direction perpendicular to the X and Y directions. In Fig. 4, the light rays emitted from the lighting lens 1 are shown by dashed lines.

[0011] As shown in FIGS. 1 to 4, the illumination lens 1 is made of a transparent material that refracts light, and diffuses light emitted from a light source 11 having a light emitting element such as an LED (Light Emitting Diode) in the X direction.

[0012] Specifically, the illumination lens 1 has an incident surface 2 that receives light emitted from a light source 11, and an exit surface 3 that emits the light that has entered the incident surface 2. The incident surface 2 is formed in a concave shape so as to cover the light source 11. The exit surface 3 is formed in a convex shape at a position opposite the incident surface 2. For convenience, in FIGS. 1 to 4, the light source 11 is arranged so as to coincide with the center point of the illumination lens 1 when the illumination lens 1 is viewed from the Y direction, but this is not limited to this.

[0013] Furthermore, regions 2a to 2d are formed on the incident surface 2. In FIG. 1, if an axis passing through the center point of the illumination lens 1 and extending in the Z direction is defined as axis Z1 and an axis extending in the X direction is defined as axis X1, region 2a is formed to the left of axis Z1 and above axis X1, region 2b is formed to the right of axis Z1 and above axis X1, region 2c is formed to the left of axis Z1 and below axis X1, and region 2d is formed to the right of axis Z1 and below axis X1. That is, regions 2a and 2b are separated by axis Z1, and regions 2c and 2d are separated by axis Z1. Regions 2a and 2c are separated by axis X1, and regions 2b and 2d are separated by axis X1.

[0014] 1 to 3, the entrance surface 2 is formed to have a curved surface that is asymmetric with respect to the axis Z1 and also with respect to the axis X1. That is, the curved surfaces of the regions 2a and 2c are asymmetric with respect to the regions 2b and 2d, and the curved surfaces of the regions 2a and 2b are asymmetric with respect to the regions 2c and 2d.

[0015] Furthermore, regions 3a to 3d are formed on the emission surface 3. In Fig. 1, region 3a is formed on the left side of axis Z1 and above axis X1, region 3b is formed on the right side of axis Z1 and above axis X1, region 3c is formed on the left side of axis Z1 and below axis X1, and region 3d is formed on the right side of axis Z1 and below axis X1. That is, regions 3a and 3b are separated by axis Z1, and regions 3c and 3d are separated by axis Z1. Regions 3a and 3c are separated by axis X1, and regions 3b and 3d are separated by axis X1.

[0016] 1 to 3, the emission surface 3 is formed to have a curved surface that is asymmetric with respect to the axis Z1 and also with respect to the axis X1. That is, the curved surfaces of the regions 3a, 3c and the regions 3b, 3d are asymmetric with each other, and the curved surfaces of the regions 3a, 3b and the regions 3c, 3d are asymmetric with each other.

[0017] In FIG. 1, for convenience, the intersection of the axes Z1 and X1 is set as the center point of the illumination lens 1, but this intersection can be set arbitrarily.

[0018] As shown in FIGS. 4 and 17, the illumination lens 1 has an asymmetric light distribution in regions 3a and 3b (2a and 2b) with respect to an axis Y1 that passes through the center point of the illumination lens 1 and extends along the Y axis. As shown in FIG. 17, the entrance surface 2 includes regions 2a and 2b. The exit surface 3 includes regions 3a and 3b. A first light 15 enters region 2a and is emitted from region 3a. A second light 16 enters region 2b and is emitted from region 3b. The first light 15 is, for example, a parallel light. Specifically, the first light 15 includes a light beam 15a and a light beam 15b that is parallel to the light beam 15a. The second light 16 is more diffused than the first light 15. Specifically, the second light 16 includes a light beam 16a and a light beam 16b that is not parallel to the light beam 16a. In this embodiment, after being emitted from region 3b, second light 16 is focused at point 16c and then diffused. However, the present disclosure is not limited to this, and second light 16 may be diffused without being focused. In this embodiment, first light 15 is parallel light, but it does not necessarily have to be strictly parallel, as long as second light 16 is more diffused than first light 15.

[0019] Although not shown in the figures, the illumination lens 1 also has asymmetric light distribution in regions 3c and 3d (regions 2c and 2d). The light emitted from region 3c of the illumination lens 1 is more diffused in the X direction than the light emitted from region 3d. That is, the third light that enters region 2d and is emitted from region 3d becomes parallel light. The fourth light that enters region 2c and is emitted from region 3c becomes light that is slightly diffused from the parallel light. In this embodiment, the third light is parallel light, but it does not necessarily have to be strictly parallel, as long as the fourth light is more diffused than the third light.

[0020] (Light distribution of lighting equipment) Fig. 5 is a cross-sectional view showing an installation state of the lighting device according to this embodiment. The lighting device 10 is installed in a tunnel 22 and irradiates light onto the road surface of a road 21. In Fig. 5, the left-right direction of the drawing corresponds to the width direction of the road 21.

[0021] The lighting device 10 includes an illumination lens 1 and a light source 11. The lighting device 10 is installed on the wall surface of a tunnel 22 so that the height from the road 21 is h and the installation angle with respect to the road 21 is θ1.

[0022] Fig. 6 is a plan view showing an installation state of the lighting device according to this embodiment, in which the tunnel 22 is omitted.

[0023] 6, road 21 is formed with lane 23 and lane 25, which is an oncoming lane to lane 23, separated by a center line 24. In the following description, the traveling direction of vehicle 26 traveling on lane 23 is referred to as traveling direction S1 (first traveling direction), and the traveling direction of vehicle 27 traveling on lane 25 is referred to as traveling direction S2 (second traveling direction). These traveling directions S1 and S2 coincide with the X direction.

[0024] Fig. 7 to Fig. 11 are diagrams showing the illuminance distribution of the lighting device according to this embodiment. Specifically, Fig. 7 is a diagram showing the illuminance distribution of lighting device 10, Fig. 8 is a diagram showing only the illuminance distribution of light emitted from region 3a of emission surface 3, Fig. 9 is a diagram showing only the illuminance distribution of light emitted from region 3b of emission surface 3, Fig. 10 is a diagram showing only the illuminance distribution of light emitted from region 3c of emission surface 3, and Fig. 11 is a diagram showing only the illuminance distribution of light emitted from region 3d of emission surface 3. Note that in Fig. 7 to Fig. 11, regions with the same illuminance are shown connected by curved lines.

[0025] 7 to 11 show, in a plan view, the illuminance distribution of the lighting device 10 in an area of ±30 m in the travel direction and ±3 m in the width direction of the road 21, with the intersection O between the front direction of the lighting lens 1 and the center line 24 as the center. The lighting device 10 is installed at a position of ±0 m in the travel direction, −1.8 m in the width direction, and at a height h=5 m.

[0026] As shown in Fig. 7, the illuminance of the road surface of road 21 gradually decreases with increasing distance from intersection O. Here, in lane 23, road surface 23a on the left side of the drawing and road surface 23b on the right side of the drawing have asymmetric illuminance distributions with respect to the center of the drawing (a line passing through intersection O and parallel to the width direction). In lane 25, road surface 25a on the left side of the drawing and road surface 25b on the right side of the drawing have asymmetric illuminance distributions with respect to the center of the drawing.

[0027] Specifically, in lane 23, the illuminance distribution of lighting device 10 is widely spread to the right side of the drawing (road surface 23b). This widens the illumination range of lighting device 10 on the traveling direction S1 side, thereby improving the visibility of the driver of vehicle 26 traveling in lane 23. Furthermore, in lane 23, the illuminance distribution of lighting device 10 is not widely spread to the left side of the drawing (road surface 23a), and the intervals between the curves indicating the illuminance distribution are narrow. This narrows the illumination range of lighting device 10 on the side opposite to traveling direction S1, and the illuminance is also lower, thereby reducing glare for the driver of vehicle 26. Note that, although a detailed explanation will be omitted, a similar effect can be obtained in lane 25.

[0028] (About the lighting system) FIG. 12 is a plan view showing the arrangement of lighting devices in the lighting system according to this embodiment.

[0029] In FIG. 12, a plurality of lighting devices 10 are arranged in a staggered arrangement along a road 21 in a tunnel (not shown) in the traveling direction of the road 21. Each of the plurality of lighting devices 10 emits light toward the road 21. The staggered arrangement means that the plurality of lighting devices 10 are arranged alternately at equal intervals between the current lane and the opposite lane. Specifically, the plurality of lighting devices 10 includes a plurality of first lighting devices 10 (10a) arranged in a lane 23 and a plurality of second lighting devices 10 (10b) arranged in a lane 25. The plurality of first lighting devices 10 (10a) are arranged at a first interval along the lane 23. The plurality of second lighting devices 10 (10b) are arranged at a second interval along the lane 25. The second interval may be the same as the first interval. The plurality of first lighting devices 10 (10a) are arranged with an offset in the traveling direction relative to the plurality of second lighting devices 10 (10b). The offset may be half the length of the first interval or some other length. In Fig. 12, illumination range 28 indicates the illumination range of the corresponding lighting device 10 on the road 21. By arranging the lighting devices 10 in a staggered arrangement along the road 21 in this way, the entire surface of the road 21 can be illuminated.

[0030] Furthermore, as described above, the amount of light irradiated by lighting device 10b to area 29 on the upper left side of the drawing is reduced, but since lighting device 10a has a wide illuminance distribution on the right side of the drawing, it is possible to maintain the illuminance of area 29 at a certain level or higher. This makes it possible to prevent a decrease in the illuminance of the road surface of road 21.

[0031] With the above-described configuration, the lighting lens according to this embodiment is lighting lens 1 used in lighting device 10 installed on road 21, and lighting lens 1 is arranged so that its front direction is perpendicular to the X direction. Lighting lens 1 includes: incident surface 2 that receives light emitted from light source 11; exit surface 3 that emits light that has entered incident surface 2; regions 2a, 3a (first regions) formed on incident surface 2 and exit surface 3, respectively, so as to irradiate first light toward the traveling direction S1 of road 21; and regions 2b, 3b (second regions) formed on incident surface 2 and exit surface 3, respectively, so as to irradiate second light, which is light that is more diffused than the first light, toward the side opposite to traveling direction S1 of road 21.

[0032] This increases the illuminance of the lighting device 10 on the side of the lane 23 facing the traveling direction S1, thereby improving the visibility of drivers of vehicles traveling in the traveling direction S1. Furthermore, this decreases the illuminance of the lighting device 10 on the side of the lane 23 opposite the traveling direction S1, thereby reducing glare for drivers of vehicles traveling in the traveling direction S1. Therefore, it is possible to reduce glare while widening the illumination range of the lighting device on the lane 23.

[0033] Furthermore, regions 2a and 3a are formed on the incident surface 2 and the exit surface 3 closer to the traveling direction S1 of the road 21 than regions 2b and 3b, respectively. As a result, regions 2a and 2b are formed on the incident surface 2 on the side corresponding to the irradiation direction of light, and regions 3a and 3b are formed on the exit surface 3 on the side corresponding to the irradiation direction of light, thereby simplifying the configuration of the lighting lens 1.

[0034] Furthermore, road 21 includes lane 23 (first lane) and lane 25 (second lane) which is an oncoming lane to lane 23. Regions 2a and 3a are formed to irradiate first light toward lane 23 in direction S1 of travel, and regions 2b and 3b are formed to irradiate second light toward the side of lane 23 opposite to direction S1 of travel. Illumination lens 1 is equipped with regions 2d and 3d (third regions) formed on incident surface 2 and exit surface 3, respectively, to irradiate third light toward lane 25 in direction S2 of travel, and regions 2c and 3c (fourth regions) formed on incident surface 2 and exit surface 3, respectively, to irradiate fourth light, which is light that is more diffused than the third light, toward the side of lane 25 opposite to direction S2 of travel.

[0035] With this configuration, as described above, it is possible to widen the illumination range of the lighting device in the lane 23 while suppressing glare.

[0036] Furthermore, in lane 25, the illuminance of lighting device 10 on the side facing the traveling direction S2 is increased, thereby improving the visibility of drivers of vehicles traveling in the traveling direction S2. In addition, in lane 25, the illuminance of lighting device 10 on the side opposite the traveling direction S2 is decreased, thereby reducing glare for drivers of vehicles traveling in the traveling direction S2. Therefore, even in lane 25, which is the opposite lane to lane 23, it is possible to reduce glare while widening the illumination range of the lighting device.

[0037] Furthermore, regions 2c and 3c are formed on the incident surface 2 and the exit surface 3 closer to the traveling direction S1 of the lane 23 than regions 2d and 3d. As a result, regions 2c and 2d are formed on the incident surface 2 on the side corresponding to the irradiation direction of light, and regions 3c and 3d are formed on the exit surface 3 on the side corresponding to the irradiation direction of light, thereby simplifying the configuration of the illumination lens 1.

[0038] Furthermore, regions 2a, 3a and regions 2b, 3b are each separated by axis Z1 (first axis) extending in the Z direction, and regions 2c, 3c and regions 2d, 3d are each separated by axis Z1. Regions 2a, 3a and regions 2c, 3c are each separated by axis X1 (second axis) extending in the X direction, and regions 2b, 2b and regions 2d, 3d are each separated by axis X1. This simplifies the configuration of the illumination lens 1.

[0039] Moreover, the lighting system according to this embodiment includes a plurality of lighting devices 10. The lighting devices 10 are arranged along the road 21 in a staggered arrangement in the direction of travel of the road 21. This makes it possible to thoroughly illuminate the road surface of the road 21 while reducing the number of lighting devices 10 installed on the road 21.

[0040] (Other embodiments) As described above, the embodiments have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to these, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made as appropriate.

[0041] The manner in which the regions in the lighting lens 1 are divided is not limited to that shown in FIG. 1. For example, the lighting device 10 can use the lighting lens 1a shown in FIG. 13. Specifically, the regions 2a and 2b are divided by an axis Z2 that forms an angle θ2 (first angle) with the axis Z1. Similarly, the regions 2c and 2d are divided by the axis Z2. Furthermore, the regions 2a and 2c are divided by an axis Z3 that forms an angle θ3 (second angle) with the axis Z1. Similarly, the regions 2b and 2d are divided by the axis Z3. The angles θ2 and θ3 may be set in any way as long as the lighting lens 1a can achieve the light distribution of the lighting lens 1 in FIG. 7.

[0042] Furthermore, as long as the light distribution (illuminance distribution) of the illumination lens 1 in Fig. 7 can be realized, the configuration of the illumination lens is not limited to Fig. 1 and Fig. 13. For example, in Fig. 1, the axis separating the regions 2a and 2c and the axis separating the regions 2b and 2d are the same axis X1, but these axes may be offset in the Z direction. Similarly, the axis separating the regions 2a and 2b and the axis separating the regions 2c and 2d are the same axis Z1, but these axes may be offset in the X direction.

[0043] 1 and 13, regions 2a to 2d and regions 3a to 3d are formed on the incident surface 2 and the exit surface 3, but this is not limiting. For example, the illuminance distribution of the illumination lens 1 in FIG. 7 can also be achieved by forming only either regions 2a to 2d or regions 3a to 3d on the illumination lens 1.

[0044] Furthermore, in the above embodiment, two lanes (lanes 23 and 25) are formed on the road 21, but the lighting lens 1 can also be applied to cases where only one lane is formed on the road 21. For example, if only lane 23 is formed on the road 21, the illuminance distribution of the lighting lens 1 in FIG. 7 can be achieved by omitting areas 2c, 2d, 3c, and 3d.

[0045] Furthermore, in the above embodiment, the lighting device 10 is described as being installed in the tunnel 22, but it may also be installed at the side of a road and irradiate light onto the road.

[0046] Fig. 14 is a perspective view showing another example of an illumination lens according to this embodiment, and Fig. 15 is a cross-sectional view of an illumination device using the illumination lens of Fig. 14. As shown in Figs. 14 and 15, illumination device 10c includes a plurality of light sources 11 and illumination lens 1b in which a plurality of illumination lenses 1 are arranged in an array. The plurality of illumination lenses 1 provided on illumination lens 1b are arranged to correspond to the plurality of light sources 11, respectively. By arranging the illumination lenses 1 in an array, illumination device 10 is able to irradiate stronger light.

[0047] 16A to 16C are plan views showing illuminance distributions of other examples of illuminating lenses according to this embodiment. Illuminating lens 1c has illuminance distribution 30a shown in FIG. 16A, and illuminating lens 1d has illuminance distribution 30b shown in FIG. 16B. In this case, by providing lighting devices 10 with lighting lenses 1b and 1c having different illuminance distributions, light emitted from lighting lenses 1c and 1d is superimposed, thereby realizing illuminance distribution 30c as shown in FIG. 16C. In this case, as shown in FIG. 16B, lighting devices 10 may be provided with lighting lens 1d whose illuminance distribution is symmetrical in a plan view. Note that the illuminance distribution does not necessarily have to be symmetrical, and it is also possible to include two or more types of lenses having different illuminance distributions, including asymmetric distributions, arranged in combination in the array shown in FIG. 14.

[0048] According to one aspect of the present invention, it is possible to reduce glare while widening the illumination range of a lighting device. [Industrial Applicability]

[0049] The lighting device and lighting system of the present invention can be installed, for example, inside a tunnel or on the side of a road, and the number of lighting devices to be installed can be reduced. [Explanation of symbols]

[0050] 1(1a~1d) Lighting lenses 2 Incidence plane 3. Exit surface 2a~2d,3a~3d area 10(10a~10c) Lighting device 11 Light source 21 Road 23,25 lanes 24 Center Line 23a,23b,25a,25b Road surface S1,S2 Direction of travel

Claims

1. A lighting lens used in a lighting device installed on a road, The lighting lens is arranged so that the front direction of the lighting lens is perpendicular to the parallel direction that is the direction along the road traveling direction, an incident surface that receives light emitted from the light source; an exit surface that emits light incident on the entrance surface; a first region formed on at least one of the incident surface and the exit surface so as to irradiate a first light toward a traveling direction of the road; a second region formed on at least one of the incident surface and the exit surface so as to irradiate a second light, the second light being more diffused than the first light, toward an opposite side of the road in a traveling direction; Equipped with the road includes a first lane and a second lane that is an oncoming lane of the first lane, the first area is formed to irradiate the first light toward the first lane in the traveling direction, the second area is formed to irradiate the second light in a direction opposite to a traveling direction of the first lane, The lighting lens is a third region formed on at least one of the incident surface and the exit surface so as to irradiate a third light toward the traveling direction of the second lane; a fourth region formed on at least one of the incident surface and the exit surface so as to irradiate a fourth light, which is light more diffused than the third light, toward an opposite side to the traveling direction of the second lane; Further equipped A lighting lens characterized by:

2. 2. The lighting lens according to claim 1, the first area is formed on the incident surface and the exit surface on a traveling direction side of the first lane relative to the second area, The fourth area is formed on the entrance surface and the exit surface closer to the first lane in the traveling direction than the third area. A lighting lens characterized by:

3. The lighting lens of claim 2, the first and second regions are separated by a first axis extending in a vertical direction perpendicular to the front direction and the parallel direction, the third and fourth regions are separated by the first axis; the first and fourth regions are separated by a second axis extending in the parallel direction; The second and third regions are separated by the second axis. A lighting lens characterized by:

4. The lighting lens of claim 2, the first and second regions are separated by a third axis extending in a direction forming a first angle with a vertical direction perpendicular to the front direction and the parallel direction, the third and fourth regions are separated by the third axis; the first and fourth regions are separated by a fourth axis extending in a direction forming a second angle with the vertical direction; The second and third regions are separated by the fourth axis. A lighting lens characterized by:

5. a light source having a light-emitting element; The illumination lens according to any one of claims 1 to 4, A lighting device comprising:

6. 6. The lighting device according to claim 5, a plurality of the illumination lenses; The plurality of illumination lenses have different illuminance distributions. A lighting device characterized by:

7. A plurality of the lighting devices according to claim 5 or 6 are provided, The plurality of lighting devices are arranged along the road in a staggered arrangement in the direction of travel of the road. A lighting system characterized by:

8. 2. The lighting device according to claim 1, wherein the third light is parallel light.

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