JP2015220160A - Road illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a road illumination device capable of concentrating illumination of a specified segment of a road surface and sufficiently reminding a person on the road such as a driver about its presence.SOLUTION: This invention comprises a light-emitting element 226 and a convex lens 223 positioned in front of the light-emitting element 226. The convex lens 223 is formed into a laterally long shape as seen from a light axis direction to cause a longitudinal size AL to become large as compared with a width size AW in regard to an irradiation area A formed on a road surface by irradiation light S radiated forward. The light-emitting element 226 and the convex lens 223 are constituted in such a way that an illumination intensity of an area Aa at one side in a width direction with respect to the width central line AC may become higher than that in another area Ab in the irradiation area A on the road surface by the irradiation light S.

Description

  The present invention relates to a road lighting device that can alert a person on a road, such as a driver, by irradiating a specific portion of a road surface with light.

  As a road illumination device that irradiates light to a specific portion of a road surface, a “roadway outer line illumination device” described in Patent Document 1 exists. This is an illuminating device that can illuminate the roadway outer line on the road surface as the specific portion. As shown in FIG. 10A, the illumination device of Patent Document 1 includes a plurality of LEDs 501 arranged linearly and a lens 502 such as a Fresnel lens positioned in front of the LEDs 501. By arranging the case 503 so as to be inclined with respect to the road surface, the lens 502 collects the light emitted from the LED 501 and can irradiate the roadway outer line on the road surface.

  However, in the illumination device of Patent Document 1, a Fresnel lens is used as the lens 502 as shown in FIG. In the Fresnel lens, the tip of the lens cut does not become a sharp corner, and it is inevitable that a minute curved surface is formed. For this reason, when light passes through the curved surface, irregular reflection occurs, and there is a problem that an irradiation area that illuminates the road surface is blurred. Further, when the light scattered by the irregular reflection is directed to the driver on the road, glare (dazzle) is generated, and the driver is uncomfortable. And it was not preferable because the driver was not sufficiently alerted.

JP 2002-260401 A

  An object of the present invention is to provide a road lighting device that can irradiate light intensively to a specific portion of a road surface and can sufficiently alert a person such as a driver on a road.

  The present invention provides a road illuminating device that irradiates light to a road surface, and includes a light emitting element and a convex lens positioned in front of the light emitting element, and the convex lens is irradiated with irradiation light irradiated forward from the convex lens. About the shape of the irradiation region formed on the road surface, the light emitting element and the convex lens are formed in a horizontally long shape as viewed in the optical axis direction such that the longitudinal dimension is larger than the width dimension. Among the irradiation areas on the road surface by the irradiation light, the illuminance of the area on one side in the width direction from the center line in the width direction is configured to be higher than the illuminance of other areas.

  According to this structure, the illumination intensity of the area | region in the width direction one side is higher than the illumination intensity of another area | region rather than the center line of the width direction among the irradiation areas on the road surface by the said irradiation light. For this reason, since the area | region in the width direction one side in an irradiation area | region can be emphasized and irradiated, the direction which was emphasized and irradiated on the width direction center line reference | standard can be alerted to the person who sees an irradiation area | region.

  In addition, the irradiation light can be applied to the road surface such that a region having higher illuminance than the other regions among the irradiation regions on the road surface is located on the road surface center side in the irradiation region on the road surface. .

  According to this configuration, it is possible to irradiate the irradiation light with emphasis on a position closer to the person on the center side of the road surface, so that it is easy to alert the person on the center side of the road surface.

  Further, the irradiation light from the convex lens is irradiated so that one end edge in the width direction forms a clearer edge than the other end edge in the width direction in the irradiation region on the road surface, and the one end edge in the width direction The road surface may be irradiated with the irradiation light so as to be located on the road surface center side in the irradiation region on the road surface.

  According to this structure, the said irradiation light is irradiated to a road surface so that the said width direction one end edge formed as a clear edge part may be located in the road surface center side in the irradiation area | region on the said road surface. For this reason, since the said clear edge part is located in the position near the person in the position on the road surface center side, it is easy to call attention to the person in the position on the road surface center side.

  Further, one end in the vertical direction in the light emitting portion of the light emitting element, or one end in the vertical direction among the shielding ends when a part of the light emitted from the light emitting element is shielded behind the convex lens is the light of the convex lens. It can also be located on an axis. The “longitudinal direction” is a direction orthogonal to the optical axis of the convex lens.

  According to this configuration, it is easy to make the illuminance of the region on the one side in the width direction of the irradiation region on the road surface with the irradiation light higher than the illuminance of the other region.

  Moreover, the casing which accommodates the said light emitting element and the said convex lens can be provided with the casing which opened the front, and the support part which supports the said casing in a variable angle with respect to a road surface.

  According to this configuration, the angle at which the casing is supported by the support portion can be adjusted. For this reason, on the road surface, it is possible to easily adjust a position where a region with high illuminance on one side in the width direction is irradiated with respect to the center line in the width direction among the irradiation regions on the road surface with the irradiation light.

  Further, the convex lens may be composed of a single lens. According to this configuration, scattered light generated from the convex lens can be suppressed.

  Moreover, the magnification of the longitudinal dimension with respect to the width dimension of the irradiation area | region on the said road surface shall be 30-50 times. According to this configuration, a long irradiation area can be realized with one road illumination device.

  According to the present invention, it is possible to alert the viewer of the irradiated area with the direction irradiated with emphasis on the width direction center line reference. For this reason, it can irradiate light intensively with respect to the specific part of a road surface, and it can fully alert a person on the roads, such as a driver.

It is a front view of the road lighting device concerning one embodiment of the present invention. It is a right view of the road lighting device. The illumination part of the road illuminating device is shown, (A) is a front view and (B) is a right side view. The light emission part of the road illuminating device is shown, (A) is a perspective view, (B) is a front view, (C) is a right side view, and (D) is a bottom view. (A) is the schematic of the perspective which shows the irradiation procedure of the light of the road lighting apparatus, (B) is the schematic of the longitudinal cross-sectional view which shows the irradiation procedure of the light of the road lighting apparatus. It is the schematic which shows the irradiation procedure of the light to the road of the road lighting apparatus. It is the graph of the standard visibility curve which CIE (international lighting commission) defined and showed the dark place visual sensitivity of blue LED and green LED collectively. (A) shows the setting situation of the light irradiation simulation on the road surface, and (B) shows the illuminance distribution of the longitudinal section at the center in the longitudinal direction of the irradiation region by the irradiation simulation. It is the schematic of the longitudinal cross-sectional view which shows embodiment of another light emission part. An example of the conventional road illuminating device is shown, (A) is a perspective view, (B) is the schematic of the longitudinal cross-sectional view which shows the relationship between a light emitting element and a convex lens.

  Next, an embodiment of the present invention will be described. As shown in FIGS. 1 and 2, the road illumination device of the present embodiment includes a support column 1 and an illumination unit 2. In the following description, the direction toward the center of the road and the direction of light irradiation is referred to as “front”, and the direction far from the center of the road and the direction toward light source is referred to as “rear”.

  The column part 1 includes a column 11. This support | pillar 11 is a steel pipe with a circular cross section, and as shown in FIG. 2, it is curving and formed so that it may extend vertically upwards from a lower end, and an upper part may shift | deviate back. The support 11 may be a steel pipe having a square cross section. Furthermore, the present invention is not limited to steel pipes, and can be implemented with various modifications such as H steel, resin pipes, concrete columns, and the like.

  The support | pillar 11 is fixed to the support | pillar P of the guard fence installed in the roadside, for example, via the fixing | fixed part 12 of two places up and down so that it may be located back. In this embodiment, the fixing portion 12 includes a U-bolt 121, a channel member 122 that abuts on the support pillar P of the protective fence, and a support band 123 wound around the support 11. The column 11 can be fixed by the means. In the present embodiment, the longitudinal dimension AL (see FIG. 5A) of the irradiation area A that is a belt shape is about 12 m. Corresponding to this, the installation interval of the columns 11 is set to about 14 m so that the irradiation region A adjacent in the longitudinal direction is slightly spaced (the region that is not irradiated enters).

  As shown in FIG. 1, a ring-shaped side wire attachment portion 13 is formed on the side of the column 11. Specifically, the side wire attachment portion 13 is formed by attaching an eyebolt to the column 11. A wire W connected to the road surface R or the like can be attached to the side wire attachment portion 13. For this reason, it is suppressed that the load which falls on the support | pillar 11 by a strong wind etc. arises on the support | pillar P of a protection fence. Further, as shown in FIG. 2, a ring-shaped rear wire attachment portion 16 is also formed on the upper rear side of the column 11. The rear wire attaching portion 16 can attach a fall prevention wire (not shown) connected to the wire attaching portion 28 of the illumination portion 2.

  A terminal block box 14 is attached to the rear of the column 11 in the middle in the vertical direction, and relays the electrical wiring between the power source (not shown) and the illumination unit 2. A conduit 14 a is connected below the terminal block box 14. The electrical wiring C above the terminal block box 14 passes through the inside of the column 11, is taken out from the wire extraction unit 17 projecting rearward near the upper end of the column 11, and is connected to the wire introduction unit 27 of the illumination unit 2. .

  An illumination unit attachment band 15 is attached near the upper end of the column 11. The illumination unit attachment band 15 is attached to a column attachment unit 25 of the illumination unit 2 described later, and is fixed so as to surround the column 11, so that the illumination unit 2 can be fixed to the column 11.

  The illumination unit 2 is attached in the vicinity of the tip of the column 11 and is arranged to irradiate light obliquely downward and forward as shown in FIG. The illumination unit 2 has the shape shown in FIGS. 3A and 3B, and includes a casing 21, a light emitting unit 22, a cover 23, a support unit 24 (a casing support unit 24a, an angle adjustment unit 24b, a plate unit 24c), and a column attachment. The unit 25 is provided.

  The casing 21 is a rectangular parallelepiped box having a front opening, and is formed of an aluminum alloy plate. An electric wire introduction portion 27 and a wire attachment portion 28 protrude from the rear lower surface of the casing 21. The light emitting unit 22 is arranged inside the casing 21 so that the irradiated light passes through the front opening 21 a of the casing 21. The light emitting unit 22 will be described later.

  The cover 23 is a transparent resin plate provided so as to coincide with the front opening 21 a of the casing 21. This cover 23 is a simple transparent plate and does not have a lens function like a conventionally used Fresnel lens.

  The support portion 24 is configured by combining a casing support portion 24a positioned above, an angle adjusting portion 24b positioned below, and a plate portion 24c positioned below the angle adjusting portion 24b. The casing support portion 24a is a “U” -shaped member as viewed from the front. The upper end portion 24a1 is fixed to the casing 21, and the side portion 24a2 is formed with a long hole 241 having a constant curvature that curves upward as shown in FIG. The angle adjusting part 24b is a member having a U-shape when viewed from the front and having a shape opposite to that of the casing support part 24a. The lower end portion 24b1 is fixed to the plate portion 24c, and the center bolt 242 and the positioning bolt 243 are located on the side portion 24b2. The plate portion 24c is a rectangular plate-like body that is long in the horizontal direction in the figure, and is fixed to the angle adjustment portion 24b by welding or the like.

  The center bolt 242 and the positioning bolt 243 pass through the casing support portion 24a and the angle adjustment portion 24b. The angle adjusting portion 24b can rotate with respect to the casing support portion 24a around the center bolt 242 as indicated by an arrow in FIG. The bolts 242 and 243 are loosened, and the positions (angles) of the side portions 24a2 of the casing support portion 24a and the side portions 24b2 of the angle adjusting portion 24b are adjusted around the center bolt 242, and then the bolts 242 and 243 are adjusted. By tightening, the angle of the illumination unit 2 with respect to the column 11 can be adjusted. That is, the support part 24 can support the casing 21 with respect to the road surface R in a variable angle.

  The column attachment portion 25 is attached below the plate portion 24 c of the support portion 24. The column attachment portion 25 includes a plate portion 251 having the same shape as that of the plate portion 24 c and a groove portion 252 positioned below the plate portion 251. The plate portion 251 is attached to the plate portion 24 c of the support portion 24 through the bolts 26. The groove 252 is formed so as to extend in the left-right direction shown in FIG. 3A, and the end of the illumination part mounting band 15 can be fitted therein.

  The light emitting unit 22 has the shape shown in FIGS. 4A to 4D, and includes a pedestal unit 221, a lens holding unit 222, a convex lens 223, a heat radiating unit 224, a substrate 225, and a light emitting element 226, and is formed as a single unit. Has been.

  The pedestal portion 221 has a substantially rectangular plate shape, and a substrate 225 and a light emitting element 226 are attached to the substantially center. The lens holding part 222 is integrally provided on the front surface of the pedestal part 221, and covers the rear side surface of the convex lens 223 that is not related to light irradiation from the outside.

  The heat dissipating part 224 is formed behind the base part 221 and dissipates heat generated when the light emitting element 226 emits light into the casing 21. As described above, since the casing 21 is formed of an aluminum alloy plate and has excellent heat dissipation, the heat dissipated from the heat dissipating part 224 is dissipated around the illumination part 2 through the casing 21. As shown in FIG. 4D, the heat dissipating part 224 is formed in a fin shape by arranging a plurality of tooth parts 224a at intervals, and the heat dissipating efficiency is enhanced.

  Note that portions other than the convex lens 223, the substrate 225, and the light emitting element 226 are black, and irregular reflection (reflection that does not contribute to the formation of the irradiation area A on the road surface) is suppressed. The same applies to the inside of the light emitting unit 22, and a black plate (not shown) is arranged around the light emitting element 226 to suppress irregular reflection inside the light emitting unit 22.

  The convex lens 223 is an acrylic resin-made meniscus lens having a rough shape with a concave rear surface as an incident surface and a curved surface (convex surface) as a front surface as an output surface (see FIG. 5A). ) In (B), the rear surface is shown as a flat surface for the sake of simplicity, but it is actually a concave surface). The material is not limited to acrylic resin, and various materials such as polycarbonate resin and glass can be used. Further, the shape of the convex lens 223 is not limited to a meniscus lens, and can be a lens having various shapes such as a plano-convex lens having a flat rear surface.

  The convex lens 223 is located in front of the light emitting element 226. As shown in FIG. 5A, the convex lens 223 is a road surface that is a region that is fixedly formed on the road surface R by illuminating the road surface R with irradiation light S emitted forward from the convex lens 223. About the shape of the upper irradiation area | region A, it is formed in the horizontally long shape by the optical axis direction view (front-back direction view) so that it may become a shape where the longitudinal direction dimension AL is large compared with the width direction dimension AW. The shape of the irradiation area A on the road surface is a shape extending in the linear direction along the longitudinal direction of the road surface R as schematically shown in FIG. When the road lighting device of the present embodiment is installed on an expressway, the curve on the expressway is gentler than that on a general road, so that even a linear irradiation area can be handled without any problem. For this reason, it is not necessary to bother to use a curved road illumination device in which the irradiation area A on the road surface is curved.

  The convex lens 223 of this embodiment is not a combination of a plurality of lenses, but is composed of a single convex lens. For this reason, the scattered light which arises from the convex lens 223 can be suppressed, and it can be set as the irradiation light S which reduced the glare (glare) by this.

  The light emitting element 226 is a semiconductor element in which a light emitting portion emits light when energized, for example, an LED element. The light emitting element 226 of the present embodiment is configured by arranging four 1 mm square light emitting units (light emitting surfaces) 226a side by side on a substrate 225 (illustrated schematically in FIG. 5A). Therefore, the magnification of the horizontal dimension with respect to the vertical dimension of the light emitting portion in the light emitting element 226 is four times. For this reason, by combining with the horizontally long convex lens 223, a long irradiation region can be formed without arranging a plurality of light emitting elements long in a horizontal row as in the prior art (see FIG. 10A). In order to form the light emitting part 22 in a compact manner, the magnification of the horizontal dimension with respect to the vertical dimension of the light emitting part in the light emitting element 226 is preferably set to 1 to 5 times.

  In the light emitting element 226 and the convex lens 223, the illuminance of the area Aa on the one side in the width direction of the irradiation area A on the road surface with the irradiation light S from the width direction center line AC (see FIG. 5A) is different. It is comprised so that it may become higher than the illumination intensity of area | region Ab. Specifically, as shown in FIG. 5B, the position of the light emitting element 226 with respect to the convex lens 223 is a position where the light emitting portion of the light emitting element 226 substantially coincides with the rear focal point of the convex lens 223. One end 226a in the vertical direction of the portion is located on the optical axis AX of the convex lens 223.

  Due to the positional relationship of the light emitting element 226 with respect to the optical axis AX, as shown in FIG. 5B, on the road at an irradiation distance D (about 4.6 m in the present embodiment) on the optical axis AX from the front surface of the convex lens 223. In the irradiation region A, the one end edge A1 in the width direction is clearer and has higher illuminance than the other end edge A2 in the width direction.

  Further, the light emitting element 226 used in the present embodiment is a green LED element. For this reason, the irradiation light S from the convex lens 223 becomes green light. As shown in FIG. 7, the green LED element is more visible than the blue LED element in the dark place because the wavelength matches the peak of the dark place vision of the standard visibility curve defined by the CIE (International Commission on Illumination). Excellent in properties. In FIG. 7, the horizontal axis indicates the wavelength, and the vertical axis indicates the relative visibility. In addition, as shown in FIG. 7, the green LED element of this embodiment is more excellent in visibility than a blue LED element also in photopic vision.

  As described above, in the road illumination device of the present embodiment, the illuminance of the area Aa on the one side in the width direction of the irradiation area A on the road surface with the irradiation light S from the width direction center line AC is higher than the illuminance of the other area Ab. The light distribution pattern is so high as to be high. For this reason, since the area Aa on one side in the width direction in the irradiation area A on the road surface that coincides with a certain specific portion on the road surface R can be emphasized and irradiated, the direction irradiated with emphasis on the width direction center line AC reference is A person (such as a driver of a vehicle) who sees the irradiation area A on the road surface is alerted.

  The relationship between the road surface irradiation area A and the road surface R is that the area Aa having a higher illuminance than the other areas Ab in the road surface irradiation area A is the road surface center side in the road surface irradiation area A (the center in the width direction of the road surface R). The irradiation light S is applied to the road surface R so as to be positioned on the side). Therefore, it is possible to irradiate irradiation light with emphasis on a position close to a person (such as a driver of a vehicle) at a position on the center side of the road surface, so that it is easy to alert a person at a position on the center side of the road surface.

  In addition to the above, as shown in FIG. 5B, the irradiation light S irradiated forward from the convex lens 223 has a width direction one end edge A1 in the road surface irradiation region A and a width direction other end edge A2. Irradiation to form a clearer edge (cut-off line). And the irradiation light S is irradiated to the road surface R so that the said width direction one end edge A1 may be located in the road surface center side in the road surface irradiation area | region A. As shown in FIG. For this reason, since the said clear edge part is located in the position close | similar to the person (vehicle driver etc.) in the position of the road surface center side, it is easy to alert a person in the position of the road surface center side.

  Here, FIGS. 8A and 8B show the irradiation simulation of the present embodiment. As shown in FIG. 8 (A), the front center of the illumination unit 2 is arranged at a height of 3500 mm, the irradiation angle is 40.5 ° on a vertical basis, and the distance from the front end of the illumination unit 2 to the evaluation road surface R is 4600 mm. FIG. 8B shows the illuminance distribution in the width direction of the irradiation area A on the road as a result of simulating irradiation in the above situation. “0” on the horizontal axis in FIG. 8B coincides with the irradiation center, the right side in FIG. 8A is the right (plus) direction in the horizontal axis in FIG. 8B, and the upper side in FIG. The left side is the left (minus) direction of the horizontal axis in FIG. The vertical axis | shaft of FIG. 8 (B) shows illumination intensity. As shown in FIG. 8 (B), the peak of illuminance is located in the width direction of the on-road irradiation area A, not on the other end side A2 in the width direction but near the one end edge A1 in the width direction. The peak of illuminance does not coincide with the one end edge A1 in the width direction, and is located slightly closer to the center line (AC) in the width direction than the end edge.

  Due to the positional relationship of the light emitting element 226 with respect to the optical axis AX shown in FIG. 5B, the widthwise one end edge A1 of the on-road irradiation area A that is separated from the convex lens 223 by the irradiation distance D is the widthwise other end edge A2. Therefore, the road illumination device of the present embodiment can easily form a region Aa with high illuminance.

  The magnification of the longitudinal dimension AL with respect to the width dimension AW of the irradiation area A on the road surface is preferably 30 to 50 times. In the present embodiment, when an area irradiated with an illuminance of 1 lux or more is defined as an on-road irradiation area A, the width dimension AW is about 310 mm (this is a dimension in the vicinity of the center in the longitudinal direction and approaches both ends in the longitudinal direction). As the width dimension AW becomes wider, the longitudinal dimension AL becomes about 12 m. Therefore, the magnification of the longitudinal dimension AL with respect to the width dimension AW in this embodiment is about 38.7 times. Thus, the long on-road irradiation area A can be realized with one road illumination device.

  The road illumination device of the present embodiment includes a casing 21 that houses the light emitting element 226 and the convex lens 223, and a support portion 24 that supports the casing 21 with respect to the road surface R in a variable angle. For this reason, it is possible to easily adjust the position on the road surface R where the region Aa with high illuminance is irradiated.

  In the road illumination device of the present embodiment, as shown in FIG. 6, the on-road irradiation area A substantially coincides with the width direction of the outer line L provided at the boundary between the roadway and the shoulder on the road surface R, and The one end A1 in the width direction of the irradiation area A on the road surface is set so as to be located on the center side of the road surface. For this reason, the road surface irradiation area A (particularly the width direction one end edge A1) can be fixedly (steadily) matched with the outer line L. Then, the irradiation light S can be intensively applied to the outer line L.

  Accordingly, the driver on the roadway can clearly see the outer line L irradiated with the irradiation light S. In particular, when there is snow, the outer line L may be hidden by the snow on the road surface R, making it difficult for the driver to see. However, the road illumination device irradiates the irradiation light S to the position where the outer line L of the road surface R is formed. Thus, even when the outer line L does not appear so as to be visible, the driver can clearly grasp the position where the outer line L exists by visually recognizing the belt-shaped irradiation area A on the road surface. In this way, safety can be improved.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the summary of this invention.

  For example, as shown in FIG. 9, a reflection mirror 1001 whose inner surface has an elliptical cross-sectional shape and a shielding portion (shade) 1002 including a substrate 1225 and a light emitting element 1226 on the rear side are provided on the rear side of the lens 1223. The light emitting unit 1022 having the configuration may be used. In the light emitting unit 1022, a part of the light emitted from the light emitting element 1226 and reflected by the inner surface (reflecting surface) of the reflecting mirror 1001 is shielded behind the lens 1223 by the shielding unit 1002. In this configuration, one end 1002a in the vertical direction (corresponding to one end 226a in the vertical direction in the light emitting portion of the light emitting element 226 in the above embodiment) of the shielding end of the shielding unit 1002 is positioned on the optical axis AX of the lens. To do. Due to the positional relationship of one end 1002a in the vertical direction of the shielding end with respect to the optical axis AX, the on-road irradiation area A formed forward from the lens 1223 is closer to the one end edge in the width direction as in the above embodiment. Can be clearer and have higher illuminance than the other edge in the width direction.

  Moreover, in the said embodiment, although the one light emission part 22 was arrange | positioned with respect to the one casing 21, it is not limited to this, The some light emission part 22 can also be arrange | positioned with respect to the one casing 21. FIG.

  Moreover, as the installation place of the road illumination device of the embodiment, since it is excellent in visibility, a highway where a driver moves at high speed is preferable. However, the installation location is not limited to the expressway, and it can be installed on a general road or a road where no vehicle passes, such as a pedestrian road.

DESCRIPTION OF SYMBOLS 1 ... Support | pillar, 2 ... Illumination part, 21 ... Casing, 223 ... Convex lens, 226 ... Light emitting element, 226a ... One end of the light emission part in the light emitting element, 24 ... Support part, 1002a ... One end of the vertical direction among shielding ends , R ... road surface, S ... irradiation light, A ... irradiation region (on-road irradiation region), AW ... width direction dimension of irradiation region, AL ... longitudinal direction size of irradiation region, AC ... center line in width direction of irradiation region, A1 ... one end edge in the width direction of the irradiation region, A2 ... the other end edge in the width direction of the irradiation region, Aa ... a region on one side in the width direction than the center line in the width direction, a region with high illuminance, Ab ... another region, AX ... an optical axis

Claims (7)

In a road lighting device that irradiates light on a road surface,
A light emitting element, and a convex lens positioned in front of the light emitting element,
The convex lens is viewed in the optical axis direction such that the longitudinal dimension is larger than the width dimension with respect to the shape of the irradiation area formed on the road surface by the irradiation light irradiated forward from the convex lens. Formed in a horizontally long shape,
The light emitting element and the convex lens are configured such that, in the irradiation region on the road surface by the irradiation light, the illuminance of the region on one side in the width direction is higher than the illuminance of the other region with respect to the center line in the width direction. A road lighting device characterized by.   The irradiation surface is irradiated with the irradiation light so that a region having higher illuminance than the other regions among the irradiation regions on the road surface is positioned on the road surface center side in the irradiation region on the road surface. The road lighting device according to claim 1. The irradiation light from the convex lens is irradiated so that one end edge in the width direction of the irradiation area on the road surface forms a clearer edge than the other end edge in the width direction,
The road illumination device according to claim 2, wherein the irradiation light is applied to the road surface such that the one end edge in the width direction is located on a road surface center side in the irradiation region on the road surface.   One end in the vertical direction in the light emitting portion of the light emitting element, or one end in the vertical direction among the shielding ends when a part of the light emitted from the light emitting element is shielded behind the convex lens is on the optical axis of the convex lens. The road illumination device according to claim 1, wherein the road illumination device is located in the road. A casing that opens the front, housing the light emitting element and the convex lens;
The road illuminating device according to claim 1, further comprising a support portion that supports the casing with respect to a road surface so that the angle of the casing is variable.   The road illumination device according to claim 1, wherein the convex lens is formed of a single lens.   The road illumination device according to any one of claims 1 to 6, wherein a magnification of a longitudinal dimension with respect to a width dimension of an irradiation region on the road surface is 30 to 50 times.

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