JP2015233002A - Road lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a road lighting device capable of performing uniformized lighting to a desired road surface with high stability even around the road where there are lots of powder dust, dust, nitrogen oxide, and fine particles, and capable of achieving reduction in labor and cost required for maintenance work and efficiency improvement in lighting of the road surface.SOLUTION: In a road lighting device 1: light source units 6a, 6b are installed in which light distribution control lenses 64a, 64b are provided for deflecting luminous flux of light emitting diodes 63a, 63b substantially downward as a whole, on a light projection side of the light emitting diodes 63a, 63b; the light distribution control lenses 64a, 64b perform light distribution control on irradiation light of the light emitting diodes 63a, 63b so that luminous flux density is higher on the upper side than on the lower side; and the light source units 6a, 6b irradiate a road surface irradiation region with light. The light distribution control lenses 64a, 64b are formed in such a manner that they are substantially flat projection chevron-shape having smooth curved surfaces which protrude on the light projection side, and a curvature of curved surfaces 642a, 642b on the upper side than tips 641a, 641b is smaller than a curvature of curved surfaces 643a, 643b on the lower side.

Description

  The present invention relates to a road illumination device that illuminates a road surface of a road such as an expressway.

  2. Description of the Related Art Conventionally, there is a low-position illumination device disclosed in Patent Document 1 as a road illumination device that illuminates a road surface such as an expressway. The low-position illumination device of Patent Document 1 is provided with a light distribution control lens that expands the light distribution angle in the lateral direction on the light emitting side of the light emitting diode to form a light source unit, and a plurality of the light source units are provided in the direction in which the road extends. The light source unit arranged in parallel irradiates light to the illumination area on the road surface. Furthermore, Patent Document 1 uses a light distribution control lens of a Fresnel lens that controls the light distribution so that the upper light beam density is high and the lower light beam density is low. An example of a low-position illumination device is described in which the illumination light from the lower part of the light source unit responsible for illumination in a closer region is made smaller and the illumination is more averaged overall.

JP 2013-149607 A

  By the way, in the low-position illumination device of Patent Document 1, although the upper light flux density is increased and the light distribution control is performed so that the lower light flux density is decreased, the illumination is homogenized. When road lighting is performed using a Fresnel lens, the following problems occur.

  In other words, in the atmosphere around the road, there are a lot of dust, dust, nitrogen oxides and fine particles contained in exhaust gas due to the traveling of a large number of automobiles. However, this dust-proof structure is generally a structure that is not completely sealed but allows outside air to circulate. For this reason, some fine particles etc. also flow into the road lighting device, but in the Fresnel lens, fine particles etc. enter and accumulate in the irregularities, and it is easy to disturb the assumed light distribution control and illumination to the road surface. .

  Also, when maintaining the interior of the road lighting device, the irregularities of the Fresnel lens in which fine particles or the like have accumulated are difficult to clean, increasing the labor and cost required for maintenance work.

  In addition, in the case of a Fresnel lens, there is a problem that the loss of illumination light contributing to illumination in a desired illumination area increases due to reflected light or diffracted light generated around the concave and convex grooves, and the efficiency of road illumination with respect to input power decreases. There is also.

  The present invention is proposed in order to solve the above-mentioned problems, and it is possible to highly uniformly illuminate a desired road surface even in the vicinity of a road where a large amount of dust, dust, nitrogen oxides and fine particles are present. An object of the present invention is to provide a road lighting device that can be performed and can reduce the labor and cost required for maintenance work and improve the efficiency of lighting on the road surface.

The road illumination device of the present invention includes a light source unit provided with a light distribution control lens for deflecting the light beam of the light emitting diode substantially downward as a whole on the light emitting side of the light emitting diode, and the light distribution control lens emits the light emission A light distribution control device for controlling light distribution so that a light beam density is higher above a lower side than on a lower side, and for illuminating a road surface illumination area with the light source unit, the light distribution control lens Is a substantially plano-convex mountain shape having a gentle curved surface projecting to the light projecting side, characterized in that the curvature of the curved surface above the tip is smaller than the curvature of the curved surface below. .
According to this, the light flux density is adjusted by the light distribution control lens having a substantially plano-convex mountain shape in which the curvature of the curved surface above the tip is smaller than the curvature of the curved surface below, and the road surface is leveled. Can do. Moreover, since the light distribution control lens of the light source unit has a substantially plano-convex mountain shape having a gently curved surface convex toward the light projecting side, fine particles or the like enter the unevenness like a Fresnel lens, thereby inhibiting light distribution control. Therefore, it is possible to illuminate a desired road surface with high stability even in the vicinity of a road where there are a lot of dust, dust, nitrogen oxides and fine particles. In addition, since it is a substantially convex and convex mountain shape having a gentle curved surface, it is easy to clean, can reduce the labor and cost required for maintenance work, and make it difficult to adhere dirt such as fine particles. it can. In addition, there is no loss of illumination light caused by unevenness, and for example, the road surface brightness can be doubled compared to the case of controlling with a Fresnel lens using light emitting diodes of the same output, improving the efficiency of road surface illumination. can do.

The road illumination device according to the present invention is a road illumination device according to the present invention which is a low-position illumination device, and the light source unit illuminates a traveling road area which is a road surface illumination area with a predetermined luminance or more. . The low position lighting device in each invention is installed in a place such as a side wall of a road or a railing of a bridge so that the installation height of the light source is 2 m or less from the road surface. Lighting.
According to this, it is possible to illuminate the road area with a very high degree of uniformity by the low-position illumination device that illuminates the road area from a low position such as a road side wall or a bridge rail. In addition, since the light distribution control lens deflects the light flux of the light emitting diode as a whole in a substantially downward direction, even in a low position lighting device installed at a low position, it prevents the occurrence of leakage light in the required upper and horizontal directions and operates It is possible to prevent the person from feeling dazzling. Also, with pole-type road lighting devices, there is a risk of causing a crack and causing a fall, blocking road traffic and causing a major accident. On the other hand, low-position lighting devices with low installation height provide good low-position lighting. This eliminates the risk of blocking road traffic and increases safety. Further, it is possible to efficiently perform the road surface illumination only in a necessary area without generating leakage light in an unnecessary direction, and it is possible to reduce electric power energy.

The road illumination device according to the present invention is the road illumination device according to the present invention, which is a low-position illumination device, and includes the first light source unit and the second light source unit provided above the first light source unit. The first light source unit illuminates a first traveling road area that is a road surface illumination area near a shoulder line with a predetermined luminance or more, and the second light source unit is a road surface illumination area near a median strip. Illuminating a certain second road area with a predetermined luminance or higher, the angle of the optical axis with respect to the horizontal plane in the second light source unit, the curvature of the curved surface above the tip of the light distribution control lens, the tip of the light distribution control lens The curvature of the lower curved surface is set to be smaller than those of the first light source unit.
According to this, it is possible to illuminate the road area of a wide road with a very high degree of uniformity by a low position lighting device that illuminates the road area from a low position such as a road side wall or a bridge rail. For example, it is possible to illuminate a wide road having two lanes of a driving lane and an overtaking lane with very high uniformity. In addition, since the light distribution control lens deflects the light flux of the light emitting diode as a whole in a substantially downward direction, even in a low position lighting device installed at a low position, it prevents the occurrence of leakage light in the required upper and horizontal directions and operates It is possible to prevent the person from feeling dazzling. Also, with pole-type road lighting devices, there is a risk of causing a crack and causing a fall, blocking road traffic and causing a major accident. On the other hand, low-position lighting devices with low installation height provide good low-position lighting. This eliminates the risk of blocking road traffic and increases safety. Further, it is possible to efficiently perform the road surface illumination only in a necessary area without generating leakage light in an unnecessary direction, and it is possible to reduce electric power energy.

In the road illumination device of the present invention, at least the third light source unit is provided between the first light source unit and the second light source unit in the vertical direction, and the first light source unit includes the first light source unit. A third road area that is a road surface illumination area between the second road area and the second road area is illuminated with a predetermined luminance or more, and the angle of the optical axis relative to the horizontal plane in the third light source unit The curvature of the curved surface above the tip of the light control lens and the curvature of the curved surface below the tip of the light distribution control lens are in the middle between those of the first light source unit and those of the second light source unit. It is set so that it may become.
According to this, it is possible to illuminate the road area of a wider road with a very high degree of uniformity by the low position lighting device that illuminates the road area from a low position, for example, a three-lane road A very wide road with can be illuminated with a very high degree of uniformity.

The road illuminating device of the present invention is configured such that, in each of the illuminated road areas, the road area closer to the median strip becomes narrower in the width direction of the road. An angle of the optical axis with respect to a horizontal plane and a curved surface of each light distribution control lens are set.
According to this, for example, a light emitting diode having the same output can be used to perform low-position illumination in the traveling road region that is more excellent in uniformity.

The road illumination device according to the present invention is the road illumination device according to the present invention, which is a low-position illumination device, and includes the first light source unit and the second light source unit provided above the first light source unit. The first light source unit illuminates a first traveling road area that is a road surface illumination area near a shoulder line with a predetermined luminance or more, and the second light source unit is a road surface illumination area near a median strip. A second traveling road area is illuminated with a predetermined luminance or higher, an angle of an optical axis with respect to a horizontal plane in the second light source unit is set smaller than that in the first light source unit, and the arrangement in the second light source unit is performed. The size of the light control lens and the output of the light emitting diode are set larger than those of the first light source unit.
According to this, it is possible to illuminate the road area of a wide road with a very high degree of uniformity by a low position lighting device that illuminates the road area from a low position such as a road side wall or a bridge rail. For example, it is possible to illuminate a wide road having two lanes of a driving lane and an overtaking lane with very high uniformity. In addition, since the light distribution control lens deflects the light flux of the light emitting diode as a whole in a substantially downward direction, even in a low position lighting device installed at a low position, it prevents the occurrence of leakage light in the required upper and horizontal directions and operates It is possible to prevent the person from feeling dazzling. Also, with pole-type road lighting devices, there is a risk of causing a crack and causing a fall, blocking road traffic and causing a major accident. On the other hand, low-position lighting devices with low installation height provide good low-position lighting. This eliminates the risk of blocking road traffic and increases safety. Further, it is possible to efficiently perform the road surface illumination only in a necessary area without generating leakage light in an unnecessary direction, and it is possible to reduce electric power energy.

In the road illumination device of the present invention, at least the third light source unit is provided between the first light source unit and the second light source unit in the vertical direction, and the first light source unit includes the first light source unit. A third road area that is a road surface illumination area between the second road area and the second road area is illuminated with a predetermined luminance or more, and the angle of the optical axis relative to the horizontal plane in the third light source unit The size of the light control lens and the output of the light emitting diode are set to be intermediate between those of the first light source unit and those of the second light source unit.
According to this, it is possible to illuminate the road area of a wider road with a very high degree of uniformity by the low position lighting device that illuminates the road area from a low position, for example, a three-lane road A very wide road with can be illuminated with a very high degree of uniformity.

The road illumination device of the present invention covers the entire upper surface side of the light distribution control lens in a plan view on the upper side of the light distribution control lens of the light source unit, and at least the front part is inclined obliquely downward toward the front. A light-shielding plate is provided.
According to this, the light leaking from the light source unit can be shielded by the light shielding plate, and the generation of the light leaking in the required upper and horizontal directions in the low-position lighting device can be more reliably prevented, and the driver is dazzled. It can be made not to feel. Further, the outgoing light emitted upward can be diffusely reflected by the light distribution control lens to cause spectroscopy, and for example, it can be avoided that unintentional light of yellow, red, etc. appears in white light road illumination. The overall homogenization of the road lighting color can be achieved. In addition, it is low-cost to attach the light-shielding plate, and it becomes possible to manufacture a low-position lighting device that can prevent glare for the driver and homogenize the overall color of the road surface lighting at low cost.

The road illumination device according to the present invention covers the entire upper surface side of the first light distribution control lens in a plan view on the upper side of the first light distribution control lens of the first light source unit and at least a front portion. Is provided with a first light-shielding plate inclined obliquely downward toward the front, and above the second light distribution control lens of the second light source unit, the second light distribution control lens in plan view. A second light-shielding plate is provided that covers the entire upper surface side and that has at least a front portion inclined obliquely downward toward the front.
According to this, the leakage light of the first and second light source units is shielded by the first and second light shielding plates, and the generation of the leakage light in the required upper and horizontal directions in the low-position illumination device is more reliably performed. Therefore, it is possible to prevent the driver from feeling dazzling. Further, the outgoing light emitted upward from the second light source unit is diffusely reflected by the light distribution control lens to cause spectroscopy, or the outgoing light of the first and second light source units is changed to the second light distribution control lens. , By entering into the first light distribution control lens and irregularly reflecting the light, for example, it is possible to avoid the appearance of unintentional light such as yellow and red in white light road surface illumination. The overall homogenization of the road lighting color can be achieved. Moreover, it is low-cost to attach the first and second light-shielding plates, and it becomes possible to manufacture a low-position lighting device that can prevent glare for the driver and homogenize the overall surface illumination color at low cost. .

The road illumination device according to the present invention is characterized in that a light shielding mask is partially provided on a surface of the light source unit on the upper surface side of the light distribution control lens.
According to this, the leakage light of the light source unit can be shielded by the light shielding mask, and the generation of the leakage light in the required upper and horizontal directions in the low-position illumination device can be more reliably prevented, and the driver is dazzled. It can be made not to feel. Further, the outgoing light emitted upward can be diffusely reflected by the light distribution control lens to cause spectroscopy, and for example, it can be avoided that unintentional light of yellow, red, etc. appears in white light road illumination. The overall homogenization of the road lighting color can be achieved.

The road illumination device of the present invention is provided such that a light-transmitting protective plate is provided at a position in front of the light source unit, and the light-transmitting protective plate is inclined obliquely upward toward the front. It is characterized by being.
According to this, it is possible to reduce the light totally reflected by the translucent protective plate and to increase the light transmittance of the light source unit with respect to the translucent protective plate of the light emitted from the light source unit. Bright road lighting can be performed.

The road illumination device of the present invention has a pair of support columns that are erected outside both sides of the housing that houses the light source unit and can be fixed to a side wall or a rail of the road, and the housing can tilt. The casing and the support are pivotally attached to each other, and the casing and the support are fastened through arc-shaped elongated holes at a predetermined position spaced apart from the pivoted position in the height direction. And
According to this, by tilting the housing around the pivot point and adjusting it to the required position in the direction in which the arc-shaped slot extends, it is possible to flexibly adjust the area for road surface illumination with simple adjustment work. can do. In addition, it is possible to always stably illuminate a desired area in accordance with the difference in the height of the road side wall or rail.

The road illumination device of the present invention includes another light source unit provided below the light source unit or below the first light source unit, and the road shoulder indicated on the road surface by the another light source unit. The line is illuminated as a road surface illumination area.
According to this, it is possible to illuminate the road shoulder line in addition to the travel road area with the low-position illumination device so that the driver can more clearly recognize the road shoulder line, and to improve the safety of travel. Moreover, both the illumination of the traveling road area and the illumination of the road shoulder can be performed only by the low-position illumination device having the same light source unit in the basic structure.

The road illumination device of the present invention illuminates a marking line indicated on a road surface as a road surface illumination area.
According to this, a driver | operator can be recognized more clearly and can improve the safety | security of driving | running | working.

The road illumination device of the present invention is configured so that the entire curved surface of the substantially plano-convex light distribution control lens that emits the emitted light that contributes to the illumination of the road surface illumination area is exposed in the housing. Each is installed.
According to this, since the main part of the light distribution control lens is exposed in the housing, the cleaning work becomes extremely easy, and the labor and cost required for the maintenance work can be drastically reduced.

  According to the road lighting device of the present invention, it is possible to illuminate a desired road surface that is leveled with high stability and maintenance even in the vicinity of a road where a lot of dust, dust, nitrogen oxides, and fine particles are present. The labor and cost required for the work can be reduced, and the efficiency of lighting on the road surface can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS The front view of the road illuminating device of 1st Embodiment by this invention. The longitudinal cross-sectional view of the illuminating device for roads of 1st Embodiment. (A) is a longitudinal cross-sectional view which shows the upper stage light source unit vicinity in the road illuminating device of 1st Embodiment, (b) is a longitudinal cross-sectional view which shows the lower light source unit vicinity. (A) is a side view of a light distribution control lens of a lower light source unit in the road illumination device of the first embodiment, (b) is a front view thereof, and (c) is a bottom view thereof. Front explanatory drawing explaining the illumination of the road surface by the illuminating device for roads of 1st Embodiment. Plane | planar explanatory drawing explaining the illumination of the road surface by the illuminating device for roads of 1st Embodiment. The longitudinal cross-sectional view of the illuminating device for roads of 2nd Embodiment by this invention. The partial expanded longitudinal cross-sectional view which shows the light source unit periphery of the intermediate | middle stage in the road illuminating device of 2nd Embodiment. The longitudinal cross-sectional view of the illuminating device for roads of 3rd Embodiment by this invention. The partial expanded longitudinal cross-sectional view which shows the light source unit periphery for the road shoulder line illumination in the road illuminating device of 3rd Embodiment. Front explanatory drawing explaining the illumination of the road surface by the illuminating device for roads of 3rd Embodiment. The longitudinal cross-sectional view of the illuminating device for roads of 4th Embodiment. The front view of the state which installed the illuminating device for roads of 5th Embodiment by this invention in the side wall. The side view of the state which installed the illuminating device for roads of 5th Embodiment in the side wall. The front view of the state which removed the cover part before the attachment to the installation tool of the illuminating device for roads of 5th Embodiment. AA sectional view explanatory drawing of FIG. Cross-sectional explanatory drawing corresponding to the AA line cross section of the illuminating device for roads of the modification of 5th Embodiment.

[Road Lighting Device of First Embodiment]
The road lighting device 1 according to the first embodiment of the present invention is installed on a side wall of a road such as an expressway or a rail of a bridge at a height within a range of, for example, 1 to 2 m from the road surface. As shown in FIGS. 1 and 2, for example, the low-side illumination device has a substantially rectangular parallelepiped box-shaped housing 2 provided on the inner side of the road side wall 101 or on the side wall 101. 2 is fixed to the side wall 101 with a fixture such as an anchor bolt. An opening is formed on the front side of the housing 2, and a translucent protective plate 3 such as a glass plate or an acrylic plate is attached so as to cover the opening. The protective plate 3 is preferably a transparent protective plate having a transmittance of 90% or more. Illumination light from light source units 6 a and 6 b housed in a housing 2 to be described later is emitted to the outside through the protective plate 3.

  A support body 4 that supports the installation state of the light source units 6a and 6b is provided inside the housing 2, and the support body 4 is provided with a mounting portion 41 that protrudes forward from the column portion. The mounting portion 41 is a long plate shelf extending in the longitudinal direction of the housing 2, and in this embodiment, two stages of the mounting portions 41 are formed so as to be separated from each other in the vertical direction.

  On the mounting portion 41, a substantially L-shaped plate-shaped fixture 5 is provided at a predetermined position, and the bottom 51 of the fixture 5 is fixed to the mounting portion 41 with screws or the like, and the mounting portion 52 is provided. Are erected at a predetermined angle. The fixtures 5 are arranged at predetermined intervals in the longitudinal direction of the casing 2, in other words, the road extending direction.

  The mounting portion 52 is provided so as to incline forward from the vertical, whereby light source units 6a and 6b described later are provided so that the optical axis of the illumination light is inclined downward from the horizontal. The mounting portion 52 can be adjusted by adjusting the amount of bending with respect to the bottom 51, and by adjusting the inclination angle of the mounting portion 52, the illumination light of the light source units 6a and 6b can be adjusted. The radiation angle can be adjusted.

  Light source units 6 a and 6 b are attached to the front surface side of the attachment portion 52 of each attachment 5 so that the optical axis is a normal line of the attachment portion 52. As shown in FIGS. 1 to 3, the light source units 6 a and 6 b are mounted on a substantially bottomed cylindrical holder 61, a wiring board 62 provided on the bottom inner surface of the holder 61, and the wiring board 62. It has light emitting diodes 63a and 63b and light distribution control lenses 64a and 64b provided on the light projecting side of the light emitting diodes 63a and 63b. The bottom outer surface of the holder 61 is arranged along the front surface of the mounting portion 52 and screwed. Alternatively, it is fixed to the mounting portion 52 by adhesion or the like.

  The light source units 6 a and 6 b are connected to a power supply unit in the casing 2 (not shown) by wiring 7 connected to the wiring board 62 and led out from the holder 61. The light distribution control lenses 64a and 64b have a substantially plano-convex mountain shape having a gentle curved surface convex on the light projecting side, as shown in FIGS. 63 a and 63 b are arranged so that the root portion is held by the tip portion of the side wall of the holder 61. In the holding of the light distribution control lenses 64 a and 64 b of the holder 61, the entire curved surface that emits the emitted light that contributes to the illumination of the road illumination area among the curved surfaces of the light distribution control lenses 64 a and 64 b is not covered with the holder 61. The entire curved surface that is exposed and contributes to illumination is exposed in the housing 2.

  The light distribution control lenses 64a and 64b have tips 641a and 641b through which the optical axes at the centers of the light emitting diodes 63a and 63b pass, respectively, and curved surfaces 642a and 642b above the tips 641a and 641b have curved surfaces 643a and 643a, respectively. It is formed so as to be smaller than the curvature of 643b, and the light distribution of the irradiation light L of the light emitting diodes 63a and 63b is controlled so that the light flux density becomes higher above the lower side, and the light emitting diodes 63a and 63b. The light distribution is controlled so as to deflect the light beam as a whole substantially downward.

  In the light source units 6a and 6b, the light source unit 6a provided on the lower mounting portion 41 corresponds to the first light source unit, and the light source unit 6b provided on the upper mounting portion 41 is obtained from the first light source unit. This corresponds to the second light source unit provided on the upper side.

  As shown in FIGS. 2 and 5, the light source units 6a and 6b are provided so that the angle of the optical axis with respect to the horizontal plane of the light source unit 6b is set smaller than the angle of the optical axis with respect to the horizontal plane of the light source unit 6a. The attachment portion 52 to which the light source unit 6b is attached is provided at an angle closer to the vertical than the attachment portion 52 to which the light source unit 6a is attached.

  In the light source units 6a and 6b, as shown in FIGS. 2 and 3, the curvature of the curved surface 642b above the tip 641b of the light distribution control lens 64b of the light source unit 6b is the same as that of the light distribution control lens 64a of the light source unit 6a. The curvature of the curved surface 643b below the tip 641b of the light distribution control lens 64b of the light source unit 6b is set so as to be smaller than the curvature of the curved surface 642a above the tip 641a. The light distribution control lens 64a is formed so as to be smaller than the curvature of the curved surface 643a below the tip 641a.

  When the road lighting device 1 including these light source units 6a and 6b is used to illuminate at a predetermined luminance or higher that satisfies a road lighting facility installation standard or the like by using the road surface area of the road surface 102 of the road as the road surface lighting area, FIG. As shown in FIG. 6, the lower light source unit 6a corresponding to the first light source unit illuminates the first traveling road area LR1, which is the road illumination area near the road shoulder 103, with a predetermined luminance or higher, and the second light source unit. The upper light source unit 6b corresponding to illuminates the second traveling road area LR2, which is a road illumination area near the central separation band 104, with a predetermined luminance or higher.

  At this time, in the light distribution control lenses 64a and 64b, the curvatures of the upper curved surfaces 642a and 642b are smaller than the curvatures of the lower curved surfaces 643a and 643b, respectively, and the irradiation light L of the light emitting diodes 63a and 63b is above the lower side. Since the light distribution is controlled so that the light flux density is increased, the brightness of the road surface illumination is leveled in the region closer to and farther from the shoulder line 103 in the first traveling road region LR1, and the second traveling road In the region LR2, the luminance of the road surface illumination is equalized in a region closer to and far from the road shoulder.

  Further, in the upper light source unit 6b corresponding to the second light source unit, the curvature of the upper curved surface 642b of the light distribution control lens 64b and the curvature of the lower curved surface 643b are lower light source units corresponding to the first light source unit. Since the curvature of the upper curved surface 642a and the curvature of the lower curved surface 643a of the light distribution control lens 64a in 6a are respectively smaller, the upper light source unit 6b has a higher light beam concentration than the lower light source unit 6a. Thus, the brightness of the road surface illumination in the first traveling road region LR1 close to the road lighting device 1 which is a low-position lighting device and the second traveling road region LR2 farther than this is achieved.

  In the present embodiment, the light emitting diodes 63a and 63b of the light source units 6a and 6b are of the same standard and have the same light output. For example, the light source unit 6b that illuminates the farther second traveling path region LR2 is used. A light emitting diode 63b having a different output, such as a light emitting diode having a light quantity different from that of the light emitting diode 63a of the light source unit 6a, may be used. This is a light emitting diode 63a, 63b, 63c of a second embodiment to be described later. And so on.

  Preferably, among the road areas illuminated with a predetermined luminance or higher, the road area closer to the median strip 104 is narrower in the road width direction, that is, closer to the shoulder line 103. The light source unit 6a, the width in the road width direction of the second traveling road region LR2 that is farther from the road illumination device 1 and closer to the central separation zone 104 is narrower than the first traveling road region LR1. When the angle of the optical axis with respect to the horizontal plane 6b and the curved surfaces of the respective light distribution control lenses 64a and 64b are set, the brightness of the road illumination in the first travel road area LR1 and the second travel road area LR2 farther than this is further increased. It becomes possible to homogenize.

In addition, the road lighting device 1 which is a low-position lighting device has a relative threshold increase amount TI that is the degree of glare of reduced visual function (visibility of obstacles and the like due to the presence of glare in the absence of glare). It is desirable that the ratio of decrease in the ratio is 10% or less. When the relative threshold increase amount TI is Lr: average road surface luminance (cd / m ² ) and Lv: equivalent light curtain luminance (cd / m ² ) by the lighting device in the driver's field of view, Lr ≦ 5 (cd / M ² ), TI = 65 · Lv / Lr ^0.8 (%), and Lr> 5 (cd / m ² ), TI = 95 · Lv / Lr ^1.05 (%). Evi: Illuminance (lx) in a plane perpendicular to the line of sight, θi: Angle (°) formed between the line of sight and the glare source, i: The number of target lighting devices or the number of light sources, the equivalent light curtain luminance Lv is Lv (cd / m ² ) = 10 × Σ [i = 1 ·· n] (Evi / θi ² )

For example, the road illumination device 1 which is a low-position illumination device is installed at a height in the range of 1 to 2 m from the road surface, and the visual function of light emitted from the light distribution control lenses 64a and 64b in the horizontal direction and above is lowered. The glare is reduced to 10% or less, or the light is emitted from the installed light source units 6a and 6b in the horizontal direction and upward. The visual function degradation glare of the light emitted from the light source units 6a and 6b is set to 10% or less, or the visual function degradation glare of the light emitted from the installed light source units 6a and 6b in the direction from 0 to ± 70 degrees to the left and right is 10%. The visual function deterioration glare of light that passes through the protective plate 3 and exits from the road lighting device 1 to the left and right in the direction of 0 ° to ± 70 ° is set to 10% or less. Or Alternatively, if the angle of the optical axis with respect to the horizontal plane of the light source units 6a and 6b, the light distribution angle of the light distribution control lenses 64a and 64b, the transmittance of the protective plate 3 and the like are set, the vehicle driver is more surely dazzled. The direction of the light beam that does not feel the sensation is preferable, and glare can be prevented. This is the same in the light source units 6c and 6n of the embodiments described later. In the standard of road lighting, the light shielding angle by the upper end of the windshield of the automobile is set to 20 °, the driver's line of sight is parallel to the road axis, and gazes at a depression angle of 1 °. The glare is evaluated based on a reduction of 0.0 cd / m ² in accordance with the traffic volume of the corresponding part. The road illumination device using the low-position illumination device of the present invention such as the above-described preferred example The evaluation criteria are sufficiently cleared.

  According to the road lighting device 1 of the first embodiment, the first road region LR1 and the second road region LR2 of the wide road are provided by the low position lighting device that illuminates the road region from the low position. Can be illuminated with a very high degree of uniformity, for example, a wide road having two lanes on one side of a traveling lane and an overtaking lane can be illuminated with a very high degree of uniformity.

  Further, since the light distribution control lenses 64a and 64b of the light source units 6a and 6b have a substantially plano-convex mountain shape having a gentle curved surface convex on the light projecting side, fine particles or the like enter the unevenness like a Fresnel lens. Light control is not hindered, and the illumination on the desired road surface that is leveled can be performed with high stability even in the vicinity of a road where there are many dusts, dusts, nitrogen oxides, and fine particles.

  Further, since the light distribution control lenses 64a and 64b are substantially plano-convex shapes having gentle curved surfaces, the cleaning is easy, the labor and cost required for maintenance work can be reduced, and fine particles and the like can be obtained. Dirt can also be made difficult to adhere. In addition, there is no loss of illumination light caused by unevenness, and for example, the road surface brightness can be doubled compared to the case of controlling with a Fresnel lens using light emitting diodes of the same output, improving the efficiency of road surface illumination. can do. Further, since the main parts of the light distribution control lenses 64a and 64b are exposed in the housing 2, the cleaning work becomes extremely easy, and the labor and cost required for the maintenance work can be drastically reduced.

  Further, since the light distribution control lenses 64a and 64b deflect the light beams of the light emitting diodes 63a and 63b substantially downward as a whole, a low-position illumination device installed at a low position such as the same height as the driver's line of sight is also required. It is possible to prevent light from leaking in the upper part of the vehicle and in the horizontal direction, so that the driver does not feel dazzling. Further, in the pole type road lighting device, there is a risk of causing a crack and falling, blocking road traffic and causing a major accident, but the road lighting device 1 of the low position lighting device having a low installation height is good. By performing low-position illumination, the risk of blocking road traffic can be eliminated and safety can be improved. Further, it is possible to efficiently perform the road surface illumination only in a necessary area without generating leakage light in an unnecessary direction, and it is possible to reduce electric power energy.

[Road Lighting Device of Second Embodiment]
The road lighting device 1m according to the second embodiment of the present invention is installed at a low position such as a side wall or a handrail as in the first embodiment. As shown in FIG. 7 and FIG. An intermediate light source unit 6c corresponding to the third light source unit is provided between the lower light source unit 6a corresponding to the light source unit and the upper light source unit 6b corresponding to the second light source unit. is there.

  The support 4m in the second embodiment is provided with three stages of long plate shelf-like mounting portions 41 that protrude forward from the column portion and extend in the longitudinal direction of the housing 2, and are provided in three stages. Similar to the lower mounting portion 41, a substantially L-shaped plate-shaped fixture 5 is provided at a predetermined position on the intermediate mounting portion 41 as well. Similar to the first embodiment, the fixtures 5 are arranged at predetermined intervals in the road extending direction, which is the longitudinal direction of the housing 2.

  The intermediate mounting portion 52 is also provided so as to incline forward from the vertical, and the light source unit 6 c is mounted on the front side thereof so that the optical axis is a normal line of the mounting portion 52. Similarly to the light source units 6a and 6b, the light source unit 6c also has a substantially bottomed cylindrical holder 61, a wiring board 62, a light emitting diode 63c mounted on the wiring board 62, and a light projecting side of the light emitting diode 63c. A light distribution control lens 64c is provided, and the bottom outer surface of the holding portion 61 is disposed along the front surface of the mounting portion 52 and fixed to the mounting portion 52. Further, the wiring 7 has an inner portion omitted in the drawing. Is connected to the power supply.

  Similar to the light distribution control lenses 64a and 64b, the light distribution control lens 64c has a substantially plano-convex mountain shape having a gentle curved surface convex on the light projecting side, and a light emitting diode 63c is disposed at a substantially central position on the plane side. The root portion is held by the tip portion of the side wall of the holder 61. Of the curved surface of the light distribution control lens 64c, the entire curved surface that emits the emitted light that contributes to the illumination of the road illumination area is exposed without being covered with the holder 61, and the entire curved surface that contributes to the illumination is exposed in the housing 2. Has been.

  The light distribution control lens 64c has a tip 641c through which the optical axis at the center of the light emitting diode 63c passes, and is formed so that the curvature of the curved surface 642c above the tip 641c is smaller than the curvature of the curved surface 643c below. The light distribution control is performed so that the light beam L of the light emitted from the diode 63c is higher than the lower side so that the light beam density is higher, and the light distribution control is performed so that the light beam of the light emitting diode 63c is deflected substantially downward as a whole. It has become.

  The angle of the optical axis of the light source unit 6c with respect to the horizontal plane is smaller than the angle of the optical axis with respect to the horizontal plane of the light source unit 6a located on the lower side, and larger than the angle of the optical axis with respect to the horizontal plane of the light source unit 6b located on the upper side. The attachment portion 52 to which the light source unit 6c is attached is at an angle closer to the vertical than the attachment portion 52 to which the light source unit 6a is attached, and the light source unit 6b is attached to the attachment portion 52 to which the light source unit 6c is attached. Inclined at an angle closer to the horizontal than the mounting portion 52 provided.

  The curvature of the upper curved surface 642c of the light distribution control lens 64c of the light source unit 6c is smaller than the curvature of the upper curved surface 642a of the light distribution control lens 64a of the lower light source unit 6a, and the light distribution of the upper light source unit 6b. The curvature of the lower curved surface 643c of the light distribution control lens 64c of the light source unit 6c is set in the middle so as to be larger than the curvature of the upper curved surface 642b of the control lens 64b. 6a is formed so as to be smaller than the curvature of the lower curved surface 643a of the light distribution control lens 64a and larger than the curvature of the lower curved surface 643b of the light distribution control lens 64b of the upper light source unit 6b. Has been.

  When the road illumination device 1m including these light source units 6a, 6b, and 6c is used to illuminate the road area 102 on the road surface 102 with a predetermined luminance or more as a road illumination area, for example, on a road with three lanes on one side, The lower light source unit 6a corresponding to the light source unit illuminates the first traveling road region LR1, which is the road surface illumination region near the road shoulder 103, with a predetermined luminance or higher, and the upper light source unit 6b corresponding to the second light source unit. The second traveling road area LR2, which is a road surface illumination area near the central separation zone 104, is illuminated with a predetermined luminance or more, and at least a light source unit is provided between the first traveling road area LR1 and the second traveling road area LR2. The third light source unit corresponding to the third light source unit for the third traveling road region, which is a road surface illumination region including a region that is not illuminated with a predetermined luminance or higher at 6a and 6b. Illuminated with a predetermined intensity or more 6c (see FIG. 5, FIG. 6).

  At this time, similarly to the light distribution control lenses 64a and 64b, the light distribution control lens 64c also has a curvature of the upper curved surface 642c smaller than that of the lower curved surface 643c, and the irradiation light L of the light-emitting diode 63c from the lower side. Since the light distribution control is performed so that the light flux density is increased on the upper side, the luminance of the road surface illumination is uniformed between the region closer to the shoulder line 103 and the region far from the road surface region of the road surface illumination region illuminated by the light source unit 6c. Figured.

  Further, the curvature of the upper curved surface 642c and the curvature of the lower curved surface 643c of the light distribution control lens 64c in the intermediate light source unit 6c corresponding to the third light source unit are the light distribution control lens 64a in the lower light source unit 6a. The curvature of the upper curved surface 642a is smaller than the curvature of the lower curved surface 643a, and the curvature of the upper curved surface 642b of the light distribution control lens 64b and the curvature of the lower curved surface 643b of the upper light source unit 6b are respectively. Since it is large, the light concentration of the light source unit 6c in the middle stage is intermediate between the light source unit 6a in the lower stage and the light source unit 6b in the upper stage, and the road surface illumination of the road area illuminated by the light source units 6a, 6b, 6c, respectively. The brightness is leveled.

  Preferably, the light source units 6a, 6b, and 6c are configured such that, in each of the traveling road areas that are illuminated with a predetermined luminance or more, the traveling road area that is closer to the central separation zone 104 has a smaller width in the road width direction. If the angle of the optical axis with respect to the horizontal plane and the curved surfaces of the respective light distribution control lenses 64a, 64b, 64c are set, the luminance of the road surface illumination in each traveling road region can be further homogenized.

  The intermediate-stage light source unit provided between the lower-stage light source unit 6a and the upper-stage light source unit 6a can be a plurality of stages such as two stages. In this case, each intermediate-stage light source unit The configuration of the light distribution control lens is the same as that of the light source unit 6c and the light distribution control lens 64c, and the angle of the optical axis with respect to the horizontal plane of the light source unit sandwiched in the vertical direction, from the tip of the light distribution control lens. The curvature of the upper curved surface and the curvature of the curved surface below the tip of the light distribution control lens are intermediate between those of the lower light source unit that sandwiches the light source unit in the vertical direction and those of the upper light source unit. It is preferable to set to.

  According to the road lighting device 1m of the second embodiment, a corresponding effect can be obtained from the configuration corresponding to the first embodiment, and the low-position lighting device that illuminates the traveling road region from the low position can be wider. It is possible to illuminate a road area of a wide road with a very high degree of uniformity. For example, it is possible to illuminate a very wide road having three lanes on one side with a very high degree of uniformity.

[Road Lighting Device of Third Embodiment]
The road lighting device 1n according to the third embodiment of the present invention is installed at a low position such as a side wall or a handrail as in the first embodiment, and basically, as shown in FIGS. 9 and 10, the first embodiment. The light source units 6a and 6b are provided in the same configuration as in FIG. 5, except that a light source unit 6n for shoulder illumination corresponding to another light source unit is provided below the lower light source unit 6a.

  The support 4n in the third embodiment is provided with three stages of long plate shelf-like mounting portions 41 protruding forward and extending in the longitudinal direction of the housing 2 so as to be separated from each other in the vertical direction. The mounting portion 41 is provided with light source units 6a and 6b via the fixture 5 as in the first embodiment. The lowermost mounting portion 41 is formed so as to protrude longer than the upper two mounting portions 41, and in the vicinity of the front end on the mounting portion 41, a small and substantially L-shaped plate at a predetermined position. The fixtures 5 are provided, and are arranged at predetermined intervals in the road extending direction, which is the longitudinal direction of the housing 2.

  This small fixture 5 is also fixed at a predetermined angle so that the bottom 51 is fixed to the mounting portion 41 with screws or the like, and the attachment 52 is inclined forward from the vertical. The light source unit 6n is attached such that the optical axis is the normal line of the attachment portion 52. Similarly to the light source units 6a and 6b, the light source unit 6n also has a substantially bottomed cylindrical holder 61, a wiring board 62, a light emitting diode 63n mounted on the wiring board 62, and a light projecting side of the light emitting diode 63n. A light distribution control lens 64n is provided, and the bottom outer surface of the holding portion 61 is disposed along the front surface of the mounting portion 52 and is fixed to the mounting portion 52. Is connected to the power supply. As the light emitting diode 63n, an output that can perform required illumination is appropriately used.

  Similar to the light distribution control lenses 64a and 64b, the light distribution control lens 64n has a substantially plano-convex mountain shape having a gentle curved surface convex on the light projecting side, and a light emitting diode 63n is disposed at a substantially central position on the plane side. The root portion is held by the tip portion of the side wall of the holder 61. Of the curved surface of the light distribution control lens 64n, the entire curved surface that emits the emitted light that contributes to the illumination of the road surface illumination area is exposed without being covered by the holder 61, and the entire curved surface that contributes to the illumination is exposed in the housing 2. Yes.

  The light distribution control lens 64n has a tip 641n through which the optical axis at the center of the light emitting diode 63n passes, and is formed such that the curvature of the curved surface 642n above the tip 641n is smaller than the curvature of the curved surface 643n below. Light distribution control is performed so that the light beam L of the diode 63n increases from the lower side to the upper side, and the light distribution control is performed so that the light beam of the light emitting diode 63n is deflected substantially downward as a whole. It has become.

  The angle of the optical axis with respect to the horizontal plane of the light source unit 6n is steeper and larger than the angle of the optical axis with respect to the horizontal plane of the light source units 6a and 6b, and the angle of the mounting portion 52 to which the light source unit 6n is attached is the light source unit 6a, It is inclined and provided at an angle closer to the horizontal than the angle of the attachment portion 52 to which 6b is attached.

  Further, the curvature of the upper curved surface 642n of the light distribution control lens 64n of the light source unit 6n and the curvature of the lower curved surface 643n are the curvatures of the upper curved surfaces 642a and 642b of the light distribution control lenses 64a and 64b of the light source units 6a and 6b. The lower curved surfaces 643a and 643b are formed so as to be smaller than the curvatures.

  When illuminating the road surface 102 of the road with the road illumination device 1n including these light source units 6a, 6b, 6n, as shown in FIG. 11, as in the first embodiment, the lower stage corresponding to the first light source unit is used. The light source unit 6a illuminates the first traveling road region LR1 that is the road surface illumination region near the road shoulder 103 with a predetermined luminance or more, and the upper light source unit 6b corresponding to the second light source unit has a road surface near the central separation zone 104. The second traveling road area LR2 that is an illumination area is illuminated with a predetermined luminance or more.

  In addition, a light source unit 6n corresponding to another light source unit illuminates the road shoulder line 103 shown on the road surface 102 with a predetermined luminance or more using the road surface illumination area. At this time, the light distribution control lens 64n is arranged such that the curvature of the upper curved surface 642n is smaller than the curvature of the lower curved surface 643n, and the irradiation light L ′ of the light emitting diode 63n is higher on the upper side than the lower side. Since the light control is performed, the light source unit 6n can illuminate with the brightness of the region closer to and farther from the shoulder line 103 being equalized. Note that it is preferable to set the luminance of the road shoulder 103 to be higher than the luminance of the road areas LR1 and LR2 because the driver can recognize the road shoulder 103 more clearly.

  According to the road lighting device 1n of the third embodiment, a corresponding effect can be obtained from the configuration corresponding to the first embodiment, and the driver can more clearly recognize the shoulder line 103, thereby driving safety. Can be increased. Moreover, both the illumination LR1 and LR2 of the traveling road area and the illumination of the road shoulder 103 can be performed only by the low-position illumination device having the light source units 6a, 6b, and 6n having the same basic structure.

[Road Illumination Device of Fourth Embodiment]
In the first to third embodiments, as an example of the road lighting device of the present invention, the light source units 6a, 6b and the like are low-position lighting devices provided in a plurality of stages above and below, but the light source unit 6a is provided in a single stage. It may be a position lighting device. FIG. 12 shows a road lighting device 1p according to the fourth embodiment, which is a low-position lighting device in which the light source unit 6a is provided in a single stage. In the road lighting device 1p of the fourth embodiment, a long plate-like mounting portion 41 that protrudes forward from the pillar portion of the support 4p and extends in the longitudinal direction is provided, and the first embodiment and the mounting portion 41 are provided on the mounting portion 41. Similarly, the fixture 5 and the light source unit 6a are provided, and the traveling road area which is a road surface illumination area is illuminated with a predetermined luminance or more by the one-stage light source unit 6a. In the case where the road illumination device 1p according to the fourth embodiment is provided with the light source unit 6n for road shoulder illumination, the mounting is projected forward from the support 4p at a lower position away from the light source unit 6a. A portion 41 is provided, and a light source unit 6n for roadside illumination is provided in the same manner as in the third embodiment.

[Road Lighting Device of Fifth Embodiment]
The road lighting device 1 s according to the fifth embodiment of the present invention is installed at a low position at a height within a range of, for example, 1 to 2 m from the road surface on the side wall or rail of the road as in the first embodiment. As shown in FIGS. 13 to 16, the position lighting device has a substantially trapezoidal housing 2 s in side view. The housing 2s includes a main body 21 having a substantially rectangular parallelepiped box shape and an open front surface, and a cover portion 22 provided in front of the main body 21. The cover portion 22 has an inverted triangular shape in a side view, and the inside is hollow and the rear surface is open. Yes. A hinge 23 is provided at the lower end of the cover portion 22 and is attached to the lower front end of the main body 21 via the hinge 23. By rotating around the hinge 23 of the cover portion 22, the front surface of the housing 2s can be opened and closed. ing. A hook 24 is attached to the upper rear end of the cover 22, and the cover portion 22 is maintained in a closed state by hooking the hook 24 on a latch pin of a fastener 25 provided at the upper front end of the main body 21. The cover portion 22 can be opened by removing the latch.

  An opening is formed on the front side of the cover portion 22, and a translucent protective plate 3 s such as a glass plate or an acrylic plate is attached so as to cover the opening. The translucent protective plate 3s is provided at a position in front of the light source units 6d and 6e that are housed in a housing 2s to be described later, along the inclination of the front surface of the cover 22 and obliquely upward toward the front. It is arranged so as to be inclined. This protective plate 3s is also preferably a transparent protective plate having a transmittance of 90% or more. The illumination light of the light source units 6d and 6e is also emitted to the outside through the translucent protective plate 3s as in the first embodiment, but the illumination light emitted to be inclined obliquely downward toward the front is provided. The light-transmitting protective plate 3s that is inclined obliquely upward toward the front is designed to be incident at an angle close to vertical, and the light that is totally reflected by the protective plate 3s can be reduced to increase the light transmittance. It is possible.

  The housing 2s is installed on the side wall 101 of the road by the installation tool 8. The installation tool 8 has a bottom plate 81 and a pair of plate-like columns 82 and 82 standing at both ends of the bottom plate 81. The bottom plate 81 is placed on the upper surface of the side wall 101 or the like, and the side wall 101 is fixed with an anchor bolt or the like. Fixed to etc. Further, a handle-like projecting plate 26 projecting in a substantially U shape is provided on both sides of the housing 2s. The housing 2s has columns 82 and 82 standing outside the projecting plates 26 and 26 on both sides. It arrange | positions so that it may provide, and it arrange | positions so that the center board part of the protrusion plates 26 and 26 may follow the plate-shaped support | pillars 82 and 82. FIG.

  The projecting plates 26 and 26 and the columns 82 and 82 of the housing 2s are pivotally attached by the bolt fastening portion 91 at a predetermined height so that the housing 2s can be tilted, and are pivotally attached by the bolt fastening portion 91. Is fastened by the bolt fastening portion 92 via the arc-shaped elongated hole 83 at a predetermined position spaced apart from the bolt fastening portion 91 in this example, that is, a prescribed position spaced downward from the bolt fastening portion 91 in this example. The arc-shaped long hole 83 is formed so as to be concave on the side of the shaft attachment, and the casing 2s is tilted about the shaft attachment point, and is adjusted to a required position in the direction in which the arc-shaped long hole 83 extends to be a bolt fastening portion. By fastening at 92, the road illumination area by the road illumination device 1s can be adjusted. Both of the fastening holes formed on the central plate portion side of the protruding plate 26 and spaced apart in the height direction are round holes, and one of the fastening holes formed on the support column 82 side and spaced apart in the height direction is provided. It is not limited to the configuration in which the round hole is the arcuate long hole 83 on the other side, but both fastening holes that are spaced apart in the height direction on the column 82 side are round holes, and the height direction is on the center plate portion side of the protruding plate 26. One of the fastening holes that are spaced apart from each other may be a round hole and the other may be an arcuate long hole.

  A support body 4s that supports the installation state of the light source units 6d and 6e is internally mounted and fixed to the housing 2s, and a mounting tool 5s is fixed to the support body 4s, and a mounting plate 53 of the mounting tool 5s is located in front of the vertical. It is provided at a predetermined tilting angle. The light source units 6d and 6e are attached to the inclined mounting plate 53 so that the optical axis thereof is the normal line of the mounting plate 53. The light source units 6d and 6e have the optical axis of the illumination light inclined downward from the horizontal. It is provided as you do.

  The light source units 6d and 6e include a wiring board 62 fixed to the mounting plate 53, light emitting diodes 63d and 63e mounted on the wiring board 62, and light distribution control provided on the light projecting side of the light emitting diodes 63d and 63e. It has lenses 64d and 64e. The light distribution control lenses 64d and 64e are also substantially plano-convex shapes having a gentle curved surface convex on the light projecting side, and are provided so that the light emitting diodes 63d and 63e are arranged at a substantially central position on the plane side. The protruding portion protruding from the outer periphery of the bottom portion is fixed to the mounting plate 53 with screws or the like. The entire curved surface that contributes to the illumination of the light distribution control lenses 64d and 64e is exposed in the housing 2s. The light source units 6 d and 6 e are connected to the power supply unit 11 in the housing 2 s via the branch board 10 by wiring (not shown) connected to the wiring board 62.

  Similarly to the light distribution control lenses 64a and 64b of the first embodiment, each of the light distribution control lenses 64d and 64e has a distal end through which the optical axis at the center of each of the light emitting diodes 63d and 63e passes, and the curvature of the curved surface above the distal end. Is configured to be smaller than the curvature of the lower curved surface, and the light distribution of the light emitted from the light emitting diodes 63d and 63e is controlled so that the light flux density is higher above the lower side, The light distribution is controlled so that the luminous flux of the light emitting diodes 63d and 63e is deflected substantially downward as a whole.

  In the light source units 6d and 6e, the light source unit 6d provided at the lower stage corresponds to the first light source unit, and the light source unit 6e provided at the upper stage corresponds to the second light source unit provided above the first light source unit. . The light source units 6d and 6e are provided so that the angle of the optical axis with respect to the horizontal plane of the light source unit 6e is smaller than the angle of the optical axis with respect to the horizontal plane of the light source unit 6d, and the light source unit 6e is attached. The mounting plate 53 is inclined at an angle closer to the vertical than the mounting plate 53 to which the light source unit 6d is mounted.

  In this embodiment, the output of the light emitting diode 63e of the upper light source unit 6e is set to be larger than the output of the light emitting diode 63d of the lower light source unit 6d, and the light distribution control lens 64e of the upper light source unit 6e. Is set larger than the size of the light distribution control lens 64d of the lower light source unit 6d. If necessary, as in the first embodiment, the curvature of the curved surface above the tip of the light distribution control lens 64e of the light source unit 6e is changed to the curvature of the curved surface above the tip of the light distribution control lens 64d of the light source unit 6d. The curvature of the curved surface below the tip of the light distribution control lens 64e of the light source unit 6e is set to be smaller than the curvature, and the curvature of the curved surface below the tip of the light distribution control lens 64d of the light source unit 6d is set. You may set so that it may become small.

  Further, in the present embodiment, the lower light source unit 6d and the upper light source unit 6e are each provided in a line in the road extending direction, and the light source units 6d and 6e in the central portion are formed of the light emitting diodes 63d and 63e. The optical axis and the light distribution control lenses 64d and 64e are installed so that the front ends thereof are substantially perpendicular to the direction in which the road extends. The light source units 6d and 6e in the front part are the optical axes and light distributions of the light emitting diodes 63d and 63e. The front ends of the control lenses 64d and 64e are installed so as to be inclined forward from substantially perpendicular to the direction in which the road extends, and the light source units 6d and 6e in the rear part are the optical axes of the light emitting diodes 63d and 63e and the light distribution control lens. 64d and 64e are installed such that the front ends thereof are inclined rearward from substantially perpendicular to the direction in which the road extends. It becomes possible to illuminate the range of the region. In addition, when there are a plurality of light source units 6d and 6e in the central part, the front part, or the rear part, a plurality of light sources units 6d and 6e in the central part, a plurality of front parts, or a plurality of light parts in the rear part are similarly substantially vertical and front You may install in the state which inclines to the back or inclines back.

  Furthermore, in the present embodiment, the entire upper surface side of the light distribution control lens 64d is covered in a plan view above the light distribution control lens 64d of the lower light source unit 6d corresponding to the first light source unit, and at least the front part is covered. A light shielding plate 12d corresponding to a first light shielding plate inclined obliquely downward toward the front is provided, and in a plan view above the light distribution control lens 64e of the upper light source unit 6e corresponding to the second light source unit. There is provided a light shielding plate 12e corresponding to a second light shielding plate that covers the entire upper surface side of the light distribution control lens 64e and that has at least a front portion inclined obliquely downward toward the front. The light shielding plates 12d and 12e are provided at positions separated from the light distribution control lenses 64d and 64e, respectively, and the tip of the light shielding plate 12d and the tip of the light shielding plate 12e are the tip of the light distribution control lens 64d and the light distribution control lens, respectively. It protrudes forward from the tip of 64e.

  When the road illumination device 1s including these light source units 6d and 6e is used to illuminate at a predetermined luminance or higher that satisfies a road illumination facility installation standard or the like using the road surface area of the road surface as a road surface illumination area, the first light source unit The lower light source unit 6d corresponding to illuminates the first traveling road region, which is the road surface illumination region near the road shoulder, with a predetermined luminance or more, and the upper light source unit 6e corresponding to the second light source unit is closer to the central separation zone. The second traveling road area, which is the road illumination area, is illuminated with a predetermined luminance or higher (see FIGS. 5 and 6). At this time, in the light distribution control lenses 64d and 64e, the curvature of the upper curved surface is smaller than that of the lower curved surface, and the light flux density of the light emitted from the light emitting diodes 63d and 63d is higher on the upper side than the lower side. Since the light distribution control is performed, the brightness of the road surface illumination is leveled in the area closer to and far from the shoulder line in the first traveling road area, and the area closer to the shoulder line in the second traveling road area. The brightness of road lighting can be leveled in areas far away.

  Further, the size of the light distribution control lens 64e in the upper light source unit 6e corresponding to the second light source unit and the output of the light emitting diode 63e are such that the light distribution control lens 64d in the lower light source unit 6d corresponding to the first light source unit. And the output surface of the light emitting diode 63d, the road surface of the first traveling road area close to the road illumination device 1s, which is a low position lighting device, and the second traveling road area farther than this. It is possible to equalize the brightness of the illumination.

  As in the first embodiment, the road lighting device 1s, which is the low-position lighting device, is also preferably configured such that the relative threshold increase amount TI, which is the degree of visual function deterioration glare, is 10% or less.

  According to the road lighting device 1 s of the fifth embodiment, the corresponding effect is obtained from the configuration corresponding to the first embodiment, and the light leakage from the light source units 6 d and 6 e is shielded by the light shielding plates 12 d and 12 e. In addition, it is possible to more surely prevent generation of light leaking in a required upper portion or in the horizontal direction in the low position lighting device, and it is possible to prevent the driver from feeling dazzled. In addition, the emitted light emitted upward from the light source unit 6e is diffusely reflected by the light distribution control lens 64e to cause spectroscopy, or the emitted light from the light source units 6d and 6e is controlled to distribute the light from the other light source units 6e and 6d. For example, when light is incident on the lenses 64e and 64d and diffusely reflected to cause spectroscopy, it is possible to prevent unintentional light such as yellow and red from appearing in the road illumination of white light, for example. Can be homogenized as a whole. Moreover, it is low-cost to attach the light shielding plates 12d and 12e, and it becomes possible to manufacture a low-position lighting device that can prevent glare for the driver and homogenize the overall surface illumination color at low cost.

  Further, by providing the light-transmitting protective plate 3s so as to be inclined obliquely upward toward the front with respect to the light source units 6d and 6e that are inclined obliquely downward and irradiate illumination light, the protective plate 3s Illumination light can be incident at an angle close to vertical, thereby reducing the light totally reflected by the translucent protective plate 3s, and the light emitted from the light source units 6d and 6e to the translucent protective plate 3s. The light transmittance can be increased, and high-intensity road lighting can be performed more efficiently and efficiently.

  In addition, since the housing 2s can be tilted around the pivoting position, adjusted to a required position in the direction in which the arc-shaped elongated hole extends and fastened by the bolt fastening portion 92, road illumination can be performed with simple adjustment work. Can be flexibly adjusted. In addition, this adjustable structure adapts to the difference in the height of the side wall 101 of the road or the rail, and can always stably illuminate a desired area.

[Modifications of Embodiment, etc.]
In addition to each invention and each embodiment, the invention disclosed in this specification is specified by changing these partial configurations to other configurations disclosed in this specification within the applicable range, or these It includes those specified by adding other configurations disclosed in the present specification to the configuration, or those obtained by deleting these partial configurations to the extent that partial effects can be obtained and specifying them as superordinate concepts. And the following modification etc. are also included.

  For example, each traveling road area illuminated by the light source units 6a, 6b and the like in the road lighting device of the present invention is set so that the width in the road width direction becomes narrower as the traveling road area is closer to the central separation zone. If it can illuminate so that a required uniformity degree may be ensured more than predetermined brightness, it is not limited to composition, but it is the direction of the road width direction of each runway area illuminated with light source units 6a and 6b of a plurality of steps, etc. The width can be set appropriately, and the angle of the optical axis with respect to the horizontal plane of each light source unit 6a, 6b and the curved surface of each light distribution control lens 64a, 64b, etc. are set correspondingly. Is possible. When the road surface illumination area is set so that the travel road area closer to the center separation zone becomes wider in the road width direction, the output of the light emitting diode 63e of the light source unit 6e located at the upper stage, the light distribution control lens It is preferable to use a road illumination device 1s or the like in which the size of 64e is set larger than those of the light source unit 6e or the like positioned at a lower level.

  As a modification of the fifth embodiment, as in the second embodiment, a vertical direction of a lower light source unit 6d corresponding to the first light source unit and an upper light source unit 6e corresponding to the second light source unit. An intermediate light source unit corresponding to at least the third light source unit is provided between the two, and the lower light source unit 6d illuminates the first traveling road area, which is a road illumination area near the road shoulder, with a predetermined luminance or higher. The light source unit 6e illuminates the second traveling road area, which is a road surface illumination area near the central separation zone, with a predetermined luminance or more, and the intermediate light source unit between the first traveling road area and the second traveling road area. You may make it illuminate the 3rd driving | running | working road area | region which is this road surface illumination area | region with more than predetermined brightness | luminance.

  In this case, the angle of the optical axis with respect to the horizontal plane, the size of the light distribution control lens, and the output of the light emitting diode in the intermediate light source unit corresponding to the third light source unit are compared with those of the first light source unit. It is preferable to set the light source unit so that it is in the middle between them, so that the road area of a wider road can be illuminated with a very high degree of uniformity, for example, in the three lanes on one side It is possible to illuminate a very wide road having a traveling path with a very high degree of uniformity. Further, a light-shielding plate that covers the entire upper surface side of the light distribution control lens in a plan view and that has at least a front portion inclined obliquely downward toward the front also on the upper side of the intermediate light source unit corresponding to the third light source unit It is preferable to make the road illumination uniform by preventing glare and avoiding the appearance of unintended colors, for example, by avoiding mutual interference between the light emitted from the upper light source unit 6e and the intermediate light source unit.

  Further, as another modification of the fifth embodiment, as in the third embodiment, for the shoulder illumination corresponding to another light source unit below the lower light source unit 6d corresponding to the first light source unit. A light source unit 6n may be provided. In this case, the light-shielding plate that also covers the entire upper surface of the light distribution control lens 64n in a plan view and that has at least a front portion inclined obliquely downward toward the front also above the light distribution control lens 64n of the light source unit 6n. To prevent the glare and avoid the appearance of unintended colors, such as by avoiding mutual interference between the light emitted from the light source units 6d, 6e for road surface illumination and the light source unit 64n for road shoulder illumination. It is preferable to make it as illustrated.

  As yet another modification of the fifth embodiment, as in the fourth embodiment, only one light source unit 6d is provided, and light distribution control is performed in a plan view above the light distribution control lens 64d of the light source unit 6d. It is good also as a low position illuminating device which provides the light-shielding plate 12d which covers the whole upper surface side of the lens 64d, and at least front part inclines diagonally downward toward the front.

  Further, as another modified example of the fifth embodiment, a black mask is applied or pasted on the upper surface of the light distribution control lenses 64d and 64e of the light source units 6d and 6e instead of the light shielding plates 12d and 12e. The light shielding masks 13d and 13e may be partially provided by wearing them (see FIG. 17). By shielding the light leaking from the light source units 6d and 6e with the light shielding masks 13d and 13e, it is possible to more surely prevent the occurrence of light leaking in the required upper and horizontal directions in the low-position illumination device, and to make the driver more dazzling. It is possible not to make it feel, and it is possible to avoid unintentional color light from appearing mixed in the road surface illumination due to irregular reflection by the light distribution control lenses 64d and 64e, mutual interference of emitted light, etc. The overall homogenization of the color can be achieved.

  The road lighting device of the present invention is preferably a low-position lighting device, but is not limited thereto, and can be a road lighting device such as a pole type or a ceiling-mounted type. Further, the road lighting device of the present invention is a low position lighting device such as a railing lighting device, a pole type lighting device, a ceiling mounting type lighting device, or the like. It is also possible to provide an illuminating device that illuminates a marking line such as a guide line as a road surface illumination area.

  The present invention can be used when performing road surface illumination on a road such as an expressway.

DESCRIPTION OF SYMBOLS 1, 1m, 1n, 1p, 1s ... Road illumination device 2, 2s ... Case 21 ... Main body 22 ... Cover part 23 ... Hinge 24 ... Hook 25 ... Fastener 26 ... Projection plate 3, 3s ... Protection plate 4, 4m 4n, 4p, 4s ... support body 41 ... mounting portion 5, 5s ... fixture 51 ... bottom portion 52 ... attachment portion 53 ... mounting plate 6a, 6b, 6c, 6n, 6d, 6e ... light source unit 61 ... holder 62 ... Wiring board 63a, 63b, 63c, 63n, 63d, 63e ... Light emitting diode 64a, 64b, 64c, 64n, 64d, 64e ... Light distribution control lens 641a, 641b, 641c, 641n ... Tip 642a, 642b, 642c, 642n ... Upper side Curved surface 643a, 643b, 643c, 643n ... lower curved surface 7 ... wiring 8 ... installation tool 81 ... bottom plate 82 ... support post 83 ... arc-shaped long hole 91 ... bolt Fastening part 92 ... Bolt fastening part 10 ... Branch board 11 ... Power supply part 12d, 12e ... Light shielding plate 13d, 13e ... Light shielding mask 101 ... Side wall 102 ... Road surface 103 ... Road shoulder line 104 ... Center separation band L, L '... Irradiated light LR1 ... 1st runway area LR2 ... 2nd runway area

Claims (15)

A light source unit provided with a light distribution control lens for deflecting the light beam of the light emitting diode substantially downward as a whole on the light emitting side of the light emitting diode is incorporated,
The light distribution control lens controls the light distribution so that the light density of the light emitted from the light emitting diode is higher on the upper side than on the lower side;
A road illumination device that irradiates light to a road surface illumination area with the light source unit,
The light distribution control lens has a substantially plano-convex shape having a gentle curved surface convex to the light projecting side, and is formed so that the curvature of the curved surface above the tip is smaller than the curvature of the curved surface below. An illumination device for a road characterized by the above. The road lighting device according to claim 1, which is a low position lighting device,
A road illumination device that illuminates a traveling road region, which is a road surface illumination region, with a predetermined luminance or more with the light source unit. The road lighting device according to claim 1, which is a low position lighting device,
Having the first light source unit and the second light source unit provided above the first light source unit;
The first light source unit illuminates the first traveling road area, which is a road illumination area near the shoulder line, with a predetermined luminance or more,
Illuminating the second traveling road area which is the road surface illumination area near the median strip with the second light source unit at a predetermined luminance or higher,
The angle of the optical axis with respect to the horizontal plane in the second light source unit, the curvature of the curved surface above the tip of the light distribution control lens, and the curvature of the curved surface below the tip of the light distribution control lens are the first light source unit. A road lighting device characterized by being set smaller than those of the above. At least the third light source unit is provided between the first light source unit and the second light source unit in the vertical direction;
The third light source unit illuminates a third road area that is a road surface illumination area between the first road area and the second road area with a predetermined luminance or more,
The angle of the optical axis with respect to the horizontal plane in the third light source unit, the curvature of the curved surface above the tip of the light distribution control lens, and the curvature of the curved surface below the tip of the light distribution control lens are the first light source unit. 4. The road illumination device according to claim 3, wherein the road illumination device is set so as to be intermediate between them and those of the second light source unit.   Of the illuminated road areas, the road area closer to the median strip is narrower in the width direction of the road so that the angle of the optical axis with respect to the horizontal plane of each light source unit and each The road illumination device according to claim 3 or 4, wherein a curved surface of the light distribution control lens is set. The road lighting device according to claim 1, which is a low position lighting device,
Having the first light source unit and the second light source unit provided above the first light source unit;
The first light source unit illuminates the first traveling road area, which is a road illumination area near the shoulder line, with a predetermined luminance or more,
Illuminating the second traveling road area which is the road surface illumination area near the median strip with the second light source unit at a predetermined luminance or higher,
The angle of the optical axis with respect to the horizontal plane in the second light source unit is set smaller than the first light source unit,
The road illumination device, wherein a size of the light distribution control lens and an output of the light emitting diode in the second light source unit are set larger than those of the first light source unit. At least the third light source unit is provided between the first light source unit and the second light source unit in the vertical direction;
The third light source unit illuminates a third road area that is a road surface illumination area between the first road area and the second road area with a predetermined luminance or more,
The angle of the optical axis with respect to the horizontal plane in the third light source unit, the size of the light distribution control lens, and the output of the light emitting diode are between those of the first light source unit and those of the second light source unit. The road illumination device according to claim 6, wherein the road illumination device is set so as to be in the middle.   On the upper side of the light distribution control lens of the light source unit, there is provided a light shielding plate that covers the entire upper surface side of the light distribution control lens in a plan view and that at least the front part is inclined obliquely downward toward the front. The road illumination device according to any one of claims 1 to 7. The upper surface of the first light distribution control lens of the first light source unit covers the entire upper surface side of the first light distribution control lens in a plan view, and at least the front part is inclined obliquely downward toward the front. A first shading plate is provided,
The upper surface of the second light distribution control lens of the second light source unit covers the entire upper surface side of the second light distribution control lens in a plan view, and at least the front part is inclined obliquely downward toward the front. The road illumination device according to claim 3, wherein a second light shielding plate is provided.   The road illumination device according to any one of claims 1 to 7, wherein a light shielding mask is partially provided on a surface of the light source unit on the upper surface side of the light distribution control lens. A translucent protective plate is provided at a position in front of the light source unit,
The road illuminating device according to any one of claims 1 to 10, wherein the translucent protective plate is disposed so as to be inclined obliquely upward toward the front. Standing outside both sides of the housing that houses the light source unit, and having a pair of columns that can be fixed to the side wall or rail of the road,
The housing and the support are pivotally mounted so that the housing can tilt, and the housing and the support are fastened via an arc-shaped slot at a predetermined position spaced apart from the position of the shaft in the height direction. The road illumination device according to claim 2, wherein the road illumination device is worn. Another light source unit provided below the light source unit or below the first light source unit,
The road illumination device according to any one of claims 2 to 12, wherein the another light source unit illuminates a road shoulder line indicated on the road surface as a road surface illumination region.   The road illumination device according to claim 1, wherein a marking line indicated on the road surface is illuminated as a road surface illumination area. Each of the light source units is installed such that the entire curved surface of the substantially plano-convex light distribution control lens that emits the emitted light that contributes to illumination of the road surface illumination area is exposed in the housing. The road illumination device according to any one of claims 1 to 14.

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