Illumination lens, illumination device, and illumination system

Abstract

The illumination lens described in this embodiment is used in a road lighting device, and is configured such that its optical axis is perpendicular to the X-direction. The illumination lens includes: an incident surface for receiving light emitted from a light source; an exiting surface for emitting light incident on the incident surface; regions formed on the incident and exiting surfaces to illuminate a first light towards the direction of travel of the road; and regions formed on the incident and exiting surfaces to illuminate light that is more diffuse than the first light towards the side opposite to the direction of travel of the road.

Description

Technical Field

[0001] This invention relates to lenses for lighting, lighting devices, and lighting systems. Background Technology

[0002] Previously, mercury lamps and high-pressure sodium lamps were used in road lighting installations. However, in recent years, lighting devices using light-emitting elements such as LEDs (Light Emitting Diodes) as light sources have become practical in order to achieve long lifespan, high brightness, and low power consumption.

[0003] Furthermore, Patent Document 1 discloses a light distribution control lens for a lamp (lighting device). By using the light distribution control lens of Patent Document 1 in a lighting device that uses LEDs as a light source, the illumination range of the lighting device can be expanded. This allows for increasing the installation interval of the lighting device, thereby reducing the installation cost of the lighting device.

[0004] Prior art literature

[0005] Patent documents

[0006] Patent Document 1: JP Patent No. 6604593 Summary of the Invention

[0007] An embodiment of the present invention relates to an illumination lens used in a road lighting device, wherein the illumination lens is configured such that its frontal direction is perpendicular to the direction of travel along the road, i.e., a parallel direction. The illumination lens comprises: an incident surface for receiving light emitted from a light source; an exiting surface for emitting light incident on the incident surface; a first region formed on at least one of the incident surface and the exiting surface to illuminate a 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 exiting surface to illuminate a second light that is more diffuse than the first light toward the side opposite to the direction of travel of the road. Attached Figure Description

[0008] Figure 1 This is a front view of the illumination lens according to this embodiment.

[0009] Figure 2 This is a side view of the illumination lens according to this embodiment.

[0010] Figure 3 This is a perspective view of the illumination lens according to this embodiment.

[0011] Figure 4 This is a side view showing the light emitted from the lighting lens according to this embodiment.

[0012] Figure 5 This is a cross-sectional view showing the installation state of the lighting device involved in this embodiment.

[0013] Figure 6 This is a top view showing the installation state of the lighting device involved in this embodiment.

[0014] Figure 7 This is a diagram showing the illuminance distribution of the lighting device involved in this embodiment.

[0015] Figure 8 This is a diagram showing the illuminance distribution of the lighting device involved in this embodiment.

[0016] Figure 9 This is a diagram showing the illuminance distribution of the lighting device involved in this embodiment.

[0017] Figure 10 This is a diagram showing the illuminance distribution of the lighting device involved in this embodiment.

[0018] Figure 11 This is a diagram showing the illuminance distribution of the lighting device involved in this embodiment.

[0019] Figure 12 This is a top view showing the configuration of the lighting devices in the lighting system according to this embodiment.

[0020] Figure 13 This is a front view showing another example of an illumination lens according to this embodiment.

[0021] Figure 14 This is a perspective view showing other examples of lighting lenses according to this embodiment.

[0022] Figure 15 It was used Figure 14 A cross-sectional view of an illumination device with a lens for illumination.

[0023] Figure 16A This is a top view showing the illuminance distribution of other examples of lighting lenses based on this embodiment.

[0024] Figure 16B This is a top view showing the illuminance distribution of other examples of lighting lenses based on this embodiment.

[0025] Figure 16C This is a top view showing the illuminance distribution of other examples of lighting lenses based on this embodiment.

[0026] Figure 17 This is a side view showing the light emitted from the lighting lens according to this embodiment. Detailed Implementation

[0027] To increase the spacing between lighting installations, it is necessary to increase the light distribution range of the lighting devices and enhance the light emitted. However, if the light distribution range is excessively increased or the light emitted is excessively enhanced, the road surface brightness will rise. Consequently, glare may occur as strong light enters the field of vision of drivers of vehicles traveling on the road.

[0028] Therefore, the purpose of the embodiments of the present invention is to expand the illumination range of the lighting device and suppress glare.

[0029] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following description of preferred embodiments is merely illustrative in nature and is not intended to limit the invention, its applications, or its uses.

[0030] (Structure of a lens for illumination)

[0031] Figure 1 This shows a front view of the illumination lens according to this embodiment. Figure 2 This is a side view of the illumination lens according to this embodiment. Figure 3 This is a perspective view showing the illumination lens according to this embodiment. Figure 4 This is a side view showing the light emitted from the illumination lens according to this embodiment. In the following description, the X direction represents the direction of travel along the road 21 described later, i.e., the parallel direction; the Y direction represents the frontal direction of the illumination lens 1; and the Z direction represents the vertical direction perpendicular to both the X and Y directions. Furthermore, in Figure 4 In the diagram, the light emitted from the illumination lens 1 is represented by a dashed line.

[0032] like Figures 1-4 As shown, the illumination lens 1 is made of a material that refracts light through a transparent body, and diffuses the light emitted from the light source 11, which has light-emitting elements such as LEDs (Light Emitting Diodes), in the X direction.

[0033] Specifically, the illumination lens 1 includes: an incident surface 2 for receiving light emitted from the light source 11, and an exiting surface 3 for emitting light incident on the incident surface 2. The incident surface 2 is formed concave to cover the light source 11. Furthermore, the exiting surface 3 is formed convex at a position opposite to the incident surface 2. Additionally, in... Figures 1-4 For convenience, the light source 11 is configured to coincide with the center point of the illumination lens 1 when viewed from the Y direction, but is not limited to this.

[0034] Furthermore, regions 2a to 2d are formed on the incident surface 2. Figure 1In this configuration, with axis Z1 extending in the Z direction and passing through the center point of the illumination lens 1, and axis X1 extending in the X direction, 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 divided by axis Z1, and regions 2c and 2d are divided by axis X1.

[0035] like Figures 1-3 As shown, the incident surface 2 is formed as a surface that is asymmetric with respect to axis Z1, and also as a surface that is asymmetric with respect to axis X1. That is, the surfaces of regions 2a, 2c and regions 2b, 2d are asymmetric, and the surfaces of regions 2a, 2b and regions 2c, 2d are asymmetric.

[0036] Furthermore, regions 3a to 3d are formed on exit surface 3. Figure 1 In the diagram, region 3a is formed to the left of axis Z1 and above axis X1, region 3b is formed to the right of axis Z1 and above axis X1, region 3c is formed to the left of axis Z1 and below axis X1, and region 3d is formed to the right of axis Z1 and below axis X1. That is, regions 3a and 3b are divided by axis Z1, and regions 3c and 3d are divided by axis X1.

[0037] like Figures 1-3 As shown, the exit surface 3 is formed as a surface that is asymmetric with respect to axis Z1, and also as a surface that is asymmetric with respect to axis X1. That is, the surfaces of regions 3a and 3c and regions 3b and 3d are asymmetric, respectively.

[0038] In addition, Figure 1 For convenience, the intersection of axes Z1 and X1 is set as the center point of the illumination lens 1, but this intersection point can be set arbitrarily.

[0039] like Figure 4 as well as Figure 17 As shown, in regions 3a and 3b (2a and 2b), the illumination lens 1 has an asymmetrical light distribution relative to the axis Y1 that passes through the center point of the illumination lens 1 and extends along the Y-axis. Figure 17As shown, the incident surface 2 includes regions 2a and 2b. The exit surface 3 includes regions 3a and 3b. A first light beam 15 is incident on region 2a and exits from region 3a. A second light beam 16 is incident on region 2b and exits from region 3b. The first light beam 15 is, for example, a parallel light beam. Specifically, the first light beam 15 includes a beam 15a and a beam 15b parallel to the beam 15a. The second light beam 16 is more diffuse than the first light beam 15. Specifically, the second light beam 16 includes a beam 16a and a beam 16b that is not parallel to the beam 16a. In this embodiment, after exiting from region 3b, the second light beam 16 focuses at point 16c and then diffuses. However, this disclosure is not limited to this, and the second light beam 16 may also diffuse without focusing. In this embodiment, the first light beam 15 is a parallel light beam, but it does not have to be strictly parallel; the second light beam 16 only needs to be more diffuse than the first light beam 15.

[0040] Although the illustration is omitted, the light distribution of the illumination lens 1 in regions 3c and 3d (regions 2c and 2d) is also asymmetrical. 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 incident on region 2d and emitted from region 3d is parallel light. The fourth light incident on region 2c and emitted from region 3c is light that is slightly diffused from parallel light. In this embodiment, the third light is parallel light, but it does not have to be strictly parallel; the fourth light can simply be more diffused than the third light.

[0041] (Regarding the light distribution of lighting fixtures)

[0042] Figure 5 This is a cross-sectional view showing the installation state of the lighting device according to this embodiment. The lighting device 10 is installed inside the tunnel 22 to illuminate the road surface of the road 21. Additionally, Figure 5 In the attached diagram, the left and right directions correspond to the width direction of road 21.

[0043] The lighting device 10 includes a lens 1 for illumination and a light source 11. The lighting device 10 is installed on the wall of the tunnel 22 such that its height from the road 21 is h and its installation angle relative to the road 21 is θ1.

[0044] Figure 6 This is a top view showing the installation state of the lighting device according to this embodiment. Additionally, Figure 6 Tunnel 22 is omitted from the diagram.

[0045] like Figure 6As shown, on road 21, lane 23 is formed, and lane 25 is the opposite lane to lane 23, separated by center line 24. Furthermore, in the following description, the direction of travel of vehicle 26 traveling in lane 23 is designated as direction of travel S1 (first direction of travel), and the direction of travel of vehicle 27 traveling in lane 25 is designated as direction of travel S2 (second direction of travel). These directions of travel S1 and S2 are aligned with the X direction.

[0046] Figures 7-11 This is a diagram showing the illuminance distribution of the lighting device according to this embodiment. Specifically, Figure 7 This is a diagram showing the illuminance distribution of the lighting device 10. Figure 8 This is a diagram showing only the illuminance distribution of light emitted from region 3a of the exit surface 3. Figure 9 This is a diagram showing only the illuminance distribution of light emitted from region 3b of the exit surface 3. Figure 10 It is a diagram showing only the illuminance distribution of light emitted from region 3c of the exit surface 3. Figure 11 This is a diagram showing only the illuminance distribution of light emitted from region 3d of the exit surface 3. Additionally, in Figures 7-11 In the diagram, curves are used to connect and display areas with the same illuminance.

[0047] Figures 7-11 This diagram illustrates the illuminance distribution of the lighting device 10 in an area within ±30m of the travel direction and ±3m of the width direction of the road 21, viewed from above, with the intersection point O of the frontal direction of the lighting lens 1 and the centerline 24 as the center. The lighting device 10 is positioned at ±0m in the travel direction, -1.8m in the width direction, and h = 5m in height.

[0048] like Figure 7 As shown, the illuminance of road surface 21 gradually decreases with distance from intersection point O. Here, in lane 23, the illuminance distribution of road surface 23a on the left and road surface 23b on the right is asymmetrical relative to the center of the diagram (the line passing through intersection point O and parallel to the width direction). In lane 25, the illuminance distribution of road surface 25a on the left and road surface 25b on the right is asymmetrical relative to the center of the diagram.

[0049] Specifically, in lane 23, the illuminance distribution of the lighting device 10 is significantly expanded on the right side of the attached drawing (road surface 23b). As a result, the illumination range of the lighting device 10 on the travel direction S1 side is expanded, thus providing good visibility for the driver of the vehicle 26 traveling in lane 23. Furthermore, in lane 23, the illuminance distribution of the lighting device 10 is not significantly expanded on the left side of the attached drawing (road surface 23a), and the intervals between the curves representing the illuminance distribution are narrower. As a result, the illumination range on the opposite side of the travel direction S1 of the lighting device 10 is narrower, and its illuminance is also lower, thus suppressing glare for the driver of the vehicle 26. Further detailed explanation is omitted, but the same effect can be obtained in lane 25.

[0050] (Regarding the lighting system)

[0051] Figure 12 This is a top view showing the configuration of the lighting devices in the lighting system according to this embodiment.

[0052] exist Figure 12 In the tunnel (not shown), multiple lighting devices 10 are arranged along road 21 in an alternating configuration in the direction of travel on road 21. Each of the multiple lighting devices 10 illuminates road 21. The alternating configuration means that the multiple lighting devices 10 are arranged at equal intervals between each other in the same lane and the opposite lane. Specifically, the multiple lighting devices 10 include multiple first lighting devices 10 (10a) arranged in lane 23 and multiple second lighting devices 10 (10b) arranged in lane 25. The multiple first lighting devices 10 (10a) are arranged along lane 23 with a first gap. The multiple second lighting devices 10 (10b) are arranged along lane 25 with a second gap. The second gap may be the same as the first gap. The multiple first lighting devices 10 (10a) are offset relative to the multiple second lighting devices 10 (10b) in the direction of travel. The offset may be half the length of the first gap or other lengths. Figure 12 In this context, illumination range 28 represents the illumination range of the corresponding lighting device 10 for the road 21. By arranging the lighting device 10 in such an alternating configuration along the road 21, the road surface of the road 21 can be illuminated without any omissions.

[0053] Furthermore, although the amount of light irradiated by the lighting device 10b to the upper left region 29 of the attached drawing is reduced as described above, the lighting device 10a has a wider illuminance distribution on the right side of the attached drawing, thus maintaining the illuminance of region 29 at a certain level or higher. Therefore, the reduction in road surface illuminance of road 21 can be suppressed.

[0054] With the above structure, the lighting lens involved in this embodiment is a lighting lens 1 used in the lighting device 10 installed on the road 21. The lighting lens 1 is configured such that its frontal direction is perpendicular to the X direction. The lighting lens 1 includes: an incident surface 2, which receives light emitted from the light source 11; an exiting surface 3, which emits light incident on the incident surface 2; regions 2a and 3a (first regions), respectively formed on the incident surface 2 and the exiting surface 3, so as to illuminate the first light towards the travel direction S1 of the road 21; and regions 2b and 3b (second regions), respectively formed on the incident surface 2 and the exiting surface 3, so as to illuminate the second light, which is a light that diffuses more than the first light, towards the side opposite to the travel direction S1 of the road 21.

[0055] Therefore, in lane 23, the illuminance on the travel direction S1 side of the lighting device 10 is increased, thus providing good visibility for drivers of vehicles traveling in the travel direction S1. Furthermore, in lane 23, the illuminance on the opposite side of the travel direction S1 of the lighting device 10 is reduced, thus suppressing glare for drivers of vehicles traveling in the travel direction S1. Therefore, in lane 23, the illumination range of the lighting device can be expanded, and glare can be suppressed.

[0056] Furthermore, regions 2a and 3a are formed on the incident surface 2 and the exit surface 3, respectively, on the side closer to the travel direction S1 of the road 21 than regions 2b and 3b. Thus, regions 2a and 2b are formed on the incident surface 2 on the side corresponding to the direction of light illumination, and regions 3a and 3b are formed on the exit surface 3 on the side corresponding to the direction of light illumination, thereby simplifying the structure of the illumination lens 1.

[0057] Furthermore, road 21 includes lane 23 (first lane) and lane 25 (second lane), which is the opposite lane of lane 23. Regions 2a and 3a are formed to illuminate the first light towards the direction of travel S1 of lane 23, and regions 2b and 3b are formed to illuminate the second light towards the side opposite to the direction of travel S1 of lane 23. The illumination lens 1 includes: regions 2d and 3d (third regions), formed on the incident surface 2 and the exit surface 3, respectively, to illuminate the third light towards the direction of travel S2 of lane 25; and regions 2c and 3c (fourth regions), formed on the incident surface 2 and the exit surface 3, respectively, to illuminate the fourth light, which is a light that is more diffuse than the third light, towards the side opposite to the direction of travel S2 of lane 25.

[0058] In this structure, as described above, the illumination range of the lighting device can be expanded in lane 23, and glare can be suppressed.

[0059] Furthermore, in lane 25, the illuminance on the travel direction S2 side of the lighting device 10 is increased, thus providing good visibility for drivers of vehicles traveling in the travel direction S2. Conversely, in lane 25, the illuminance on the opposite side of the travel direction S2 of the lighting device 10 is decreased, thus suppressing glare for drivers of vehicles traveling in the travel direction S2. Therefore, in lane 25, which is the opposite lane to lane 23, the illumination range of the lighting device can also be expanded, and glare can be suppressed.

[0060] Furthermore, regions 2c and 3c are formed on the incident surface 2 and the exit surface 3, respectively, on the side closer to the travel direction S1 of the lane 23 than regions 2d and 3d. Thus, regions 2c and 2d are formed on the incident surface 2 on the side corresponding to the direction of light illumination, and regions 3c and 3d are formed on the exit surface 3 on the side corresponding to the direction of light illumination, thereby simplifying the structure of the illumination lens 1.

[0061] Furthermore, regions 2a, 3a and 2b, 3b are each divided by axis Z1 (first axis) extending in the Z direction, and regions 2c, 3c and 2d, 3d are each divided by axis Z1. Regions 2a, 3a and 2c, 3c are each divided by axis X1 (second axis) extending in the X direction, and regions 2b, 2b and 2d, 3d are each divided by axis X1. This simplifies the structure of the illumination lens 1.

[0062] Furthermore, the lighting system according to this embodiment includes multiple lighting devices 10. The multiple lighting devices 10 are arranged along the road 21 in an alternating manner in the direction of travel on the road 21. As a result, the number of lighting devices 10 installed on the road 21 can be reduced, and the road surface of the road 21 is illuminated without any omissions.

[0063] (Other implementation methods)

[0064] As described above, embodiments have been illustrated as examples of the technology disclosed in this application. However, the technology in this disclosure is not limited thereto and can also be applied to embodiments with appropriate modifications, substitutions, additions, omissions, etc.

[0065] Furthermore, the method of dividing the area in the illumination lens 1 is not limited to... Figure 1 For example, it can be used on lighting device 10. Figure 13 The illumination lens 1a is shown. Specifically, regions 2a and 2b are divided by axis Z2, which forms an angle θ2 (first angle) with axis Z1. Similarly, regions 2c and 2d are divided by axis Z2. Furthermore, regions 2a and 2c are divided by axis Z3, which forms an angle θ3 (second angle) with axis Z1. Similarly, regions 2b and 2d are divided by axis Z3. If the illumination lens 1a can achieve... Figure 7 The light distribution of the illumination lens 1 can be set at any angle θ2, θ3.

[0066] Furthermore, if it can be achieved Figure 7 The light distribution (illuminance distribution) of the illumination lens 1 means that the structure of the illumination lens is not limited to... Figure 1 as well as Figure 13 For example, in Figure 1 In the diagram, the axes dividing regions 2a and 2c are the same as the axes dividing regions 2b and 2d, which is axis X1. However, these axes can also deviate in the Z direction. Similarly, the axes dividing regions 2a and 2b are the same as the axes dividing regions 2c and 2d, which is axis Z1. However, these axes can also deviate in the X direction.

[0067] In addition, Figure 1 as well as Figure 13 In the illumination lens 1, regions 2a-2d and 3a-3d are formed on the incident surface 2 and the exit surface 3, but the method is not limited to these. For example, it is also possible to achieve the desired effect by forming only any one of regions 2a-2d and 3a-3d on the illumination lens 1. Figure 7 Illuminance distribution of lens 1 for illumination.

[0068] Furthermore, in the above embodiment, two lanes (lanes 23 and 25) are formed in road 21, but the illumination lens 1 can also be applied to the case where only one lane is formed in road 21. For example, when only lane 23 is formed in road 21, by omitting regions 2c, 2d, 3c, and 3d, it is possible to achieve... Figure 7 Illuminance distribution of lens 1 for illumination.

[0069] Furthermore, in the above embodiment, the lighting device 10 is described as being installed in the tunnel 22, but it can also be installed beside the road to illuminate the road.

[0070] Figure 14 This is a perspective view showing other examples of the illumination lens according to this embodiment. Figure 15 Is using Figure 14 A cross-sectional view of an illumination device using a lens for illumination. (e.g.) Figure 14 as well as Figure 15 As shown, the lighting device 10c includes a plurality of light sources 11 and a plurality of lighting lenses 1 arranged in an array, forming a lighting lens 1b. The plurality of lighting lenses 1 disposed on the lighting lens 1b are each configured to correspond to one of the plurality of light sources 11. By arranging the lighting lenses 1 in an array, the lighting device 10c can emit stronger light.

[0071] Figures 16A-16C This is a top view showing the illuminance distribution of another example of an illumination lens according to this embodiment. The illumination lens 1c has... Figure 16A The illuminance distribution is 30a, and the illumination lens has 1d. Figure 16BThe illuminance distribution is 30b. In this case, the light irradiated from the lighting lenses 1c and 1d, which are equipped with lighting lenses 1b and 1c having different illuminance distributions in the lighting device 10, overlaps, enabling... Figure 16C The illuminance distribution is 30°C. In this case, such as... Figure 16B As shown, the lighting device 10 may also include a lighting lens 1d with an illuminance distribution that is symmetrical from left to right when viewed from above. Furthermore, the illuminance distribution does not necessarily have to be symmetrical; it may also include two or more lenses with different illuminance distributions, including asymmetrical distributions. Figure 14 The array is configured in combination.

[0072] By means of the present invention, the illumination range of the lighting device can be expanded and glare can be suppressed.

[0073] Industrial availability

[0074] The lighting device and lighting system of the present invention can be installed, for example, in tunnels or along roads, and can suppress the number of lighting devices installed.

[0075] -Symbol Explanation-

[0076] 1 (1a~1d) Illumination Lens

[0077] 2 incident surfaces

[0078] 3 exit surface

[0079] Regions 2a~2d and 3a~3d

[0080] 10 (10a~10c) Lighting devices

[0081] 11 Light Sources

[0082] 21 Road

[0083] Lanes 23 and 25

[0084] 24 center line

[0085] Road surfaces 23a, 23b, 25a, and 25b

[0086] S1 and S2 are the directions of travel.

Claims

1. A lens for illumination, used in lighting devices installed on roads, The lighting lens is configured such that the frontal direction of the lighting lens is perpendicular to the direction of travel along the road, i.e., the parallel direction. The illumination lens includes: The incident surface receives light emitted from the light source; The exit surface is used to exit light incident on the incident surface; A first region is formed on at least either the incident surface or the exit surface, such that a first light is incident on the direction of travel of the road; and A second region is formed on at least either the incident surface or the exit surface, such that a second light, which is more diffuse than the first light, is irradiated onto the side opposite to the direction of travel of the road. The road includes: a first lane and an opposite lane to the first lane, namely a second lane. The first region is configured to illuminate the first light towards the direction of travel of the first lane. The second region is configured to illuminate the second light to a side opposite to the direction of travel of the first lane. This illumination lens also features: A third region, formed on at least either the incident surface or the exit surface, such that a third light is incident on the direction of travel side of the second lane; and A fourth region is formed on at least either the incident surface or the exit surface, such that a fourth light, which is more diffuse than the third light, is irradiated toward the side opposite to the direction of travel of the second lane.

2. The illumination lens according to claim 1, wherein, The first region is formed on the incident surface and the exit surface, on the travel direction side of the road, which is closer to the second region than the second region.

3. The illumination lens according to claim 1, wherein, The first region is formed on the incident surface and the exit surface, on the direction of travel side of the first lane, which is closer to the second region than the second region. The fourth region is formed on the incident surface and the exit surface, on the travel direction side of the first lane, which is closer to the third region.

4. The illumination lens according to claim 3, wherein, The first region and the second region are divided by a first axis extending in a vertical direction perpendicular to the frontal direction and the parallel direction. The third region and the fourth region are divided by the first axis. The first region and the fourth region are divided by a second axis extending in the parallel direction. The second region and the third region are divided by the second axis.

5. The illumination lens according to claim 3, wherein, The first region and the second region are divided by a third axis extending in a direction that forms a first angle with a vertical direction perpendicular to both the frontal direction and the parallel direction. The third region and the fourth region are divided by the third axis. The first region and the fourth region are divided by a fourth axis extending in a direction forming a second angle with the vertical direction. The second region and the third region are divided by the fourth axis.

6. The illumination lens according to claim 1, wherein, The first ray is a parallel ray.

7. The illuminating lens according to claim 1, wherein the third light is parallel light.

8. An illuminating apparatus comprising: a light source having a light emitting element; and the illuminating lens according to any one of claims 1 to 5.

9. The illuminating apparatus according to claim 8, wherein the illuminating apparatus comprises a plurality of the illuminating lenses, the plurality of the illuminating lenses have mutually different illuminance distributions.

10. An illuminating system comprising a plurality of the illuminating apparatuses according to claim 8 or 9, the plurality of the illuminating apparatuses are arranged along the road so as to be staggered in a traveling direction of the road.

Images